DESC:FIELD CONTROLLED ELECTROMAGNET MACHINE

CROSS REFERENCE TO RELATED APPLICATIONS
The present application claims priority from Indian Provisional Patent Application No. 202421020631 filed on 19/03/2024, the entirety of which is incorporated herein by a reference.
TECHNICAL FIELD
Generally, the present disclosure relates to an electromagnetic machine. Particularly, the present disclosure relates to a field controlled electromagnetic machine.
BACKGROUND
Field-controlled electromagnet machines are becoming more popular in electric vehicles (EVs) because of the high efficiency, compact structure, and superior power-to-weight ratio. The field controlled electromagnet motors are designed with magnetic flux flowing radially from the centre to the outer edge, making them well-suited for automotive use. As the demand for EVs continues to rise, field control machines offer a dependable solution for delivering high performance, enhancing energy efficiency, and minimizing vehicle weight.
Conventionally, the electric motors operate with a small gap between the rotor and stator to allow for smooth rotation and to prevent physical contact between the two components. Further, the motors rely on a fixed configuration of primary components, such as a single rotor and stator, to generate mechanical power. The motors use either synchronous or asynchronous (induction) operation. In synchronous motors, the rotor rotates at the same speed as the rotating magnetic field produced by the stator to always remain synchronized with the supply current. The Induction motors rely on electromagnetic induction to generate rotational motion as the rotor is induced to follow the stator’s magnetic field without any direct electrical connection to the rotor. Furthermore, in operation of the aforesaid electrical motor, one or more moving components thereof (for example, a rotor) is subjected to physical contact between one or more stationary components of the aforesaid electrical motor (for example, a stator thereof) and thereby reducing the magnetic clearance gap between the various components of the motor.
However, there are certain problems associated with the existing or above-mentioned mechanism for controlling output of the rotor-stator motor. For instance, a larger gap weakens the magnetic coupling, leading to higher power losses, reduced torque production, and increased energy consumption. Consequently, the above-mentioned inefficiency further results in higher operational temperatures, causing overheating and damage to the motor components. Additionally, fluctuations or inconsistencies in the gap also lead to vibrations, noise, and mechanical wear, thereby reducing the motor's performance, lifespan, and reliability.
Therefore, there exists a need for a mechanism for controlling output of the rotor-stator motor that is efficient, accurate, and overcomes one or more problems as mentioned above.
SUMMARY
An object of the present disclosure is to provide a system for controlling output of a multi rotor-stator motor.
Another object of the present disclosure is to provide a method of controlling output of a multi rotor-stator motor.
Yet another object of the present disclosure is to provide a system and method for controlling output of a multi rotor-stator motor, with enhanced power density, and minimized magnetic clearance gap
In accordance with an aspect of the present disclosure, there is provided a system for controlling output of a multi rotor-stator motor, the system comprises:
- a motor shaft;
- a plurality of rotors, sequentially mounted on the motor shaft;
- a plurality of slip rings electrically connected to each rotor, from the plurality of rotors;
- a plurality of brushes electrically connected to each slip ring, from the plurality of slip rings;
- a motor control unit communicably coupled with a plurality of sensors; and
- a plurality of switches configured to establish electrical connection between the motor control unit and the plurality of rotors,
wherein the motor control unit is configured to electrically connect and disconnect the plurality of rotors based on inputs received from the plurality of sensors.
The system for controlling output of a multi rotor-stator motor, as described in the present disclosure, is advantageous in terms of improved power efficiency, enhanced torque density, and greater control over the motor output. Specifically, the motor control unit electrically connects and disconnects individual rotors based on sensor inputs to optimize power delivery, improve efficiency, and adapt to varying load conditions. Additionally, the system reduces wear and tear on specific rotors by only engaging required rotors, extending the motor's lifespan and improving overall reliability. Furthermore, the use of slip rings and brushes ensures efficient electrical transfer, and the flexibility in rotor control enhances the motor's versatility and responsiveness.
In accordance with another aspect of the present disclosure, there is provided a method of controlling output of a multi rotor-stator motor, the method comprises:
- receiving inputs from the plurality of sensors to a motor control unit;
- comparing a computed torque demand with a current torque value and deriving a torque deviation via the motor control unit;
- identifying a number of rotors, from the plurality of rotors, based on the derived torque deviation via the motor control unit;
- generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches; and
- electrically connecting and disconnecting at least one rotor from the plurality of rotors via the motor control unit.
Additional aspects, advantages, features, and objects of the present disclosure would be made apparent from the drawings and the detailed description of the illustrative embodiments constructed in conjunction with the appended claims that follow.
It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the appended claims.
BRIEF DESCRIPTION OF DRAWINGS
The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the present disclosure is not limited to specific methods and instrumentalities disclosed herein. Moreover, those in the art will understand that the drawings are not to scale. Wherever possible, like elements have been indicated by identical numbers.
Embodiments of the present disclosure will now be described, by way of example only, with reference to the following diagrams wherein:
Figure 1 illustrates a system for controlling output of a multi rotor-stator motor, in accordance with an embodiment of the present disclosure.
Figure 2 illustrates a flow chart of a method of controlling output of a multi rotor-stator motor, in accordance with another embodiment of the present disclosure.
In the accompanying drawings, an underlined number is employed to represent an item over which the underlined number is positioned or an item to which the underlined number is adjacent. A non-underlined number relates to an item identified by a line linking the non-underlined number to the item. When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing.
DETAILED DESCRIPTION
The following detailed description illustrates embodiments of the present disclosure and ways in which they can be implemented. Although some modes of carrying out the present disclosure have been disclosed, those skilled in the art would recognize that other embodiments for carrying out or practicing the present disclosure are also possible.
As used herein, the term “multi rotor-stator motor” refers to an electric motor that incorporates multiple rotors and stators working in tandem to improve efficiency, power output, and overall performance of the motor. In principle, each rotor is connected to a separate stator, or multiple stators share the load of driving the rotors. The multi rotor-stator setup allows for a better distribution of power, reducing the overall stress on individual components, minimizing losses, and improving the torque and stability of the motor. The types of multiple rotor-multiple stator motors are multi-phase induction motors and multi-rotor synchronous motors. In a multi-phase induction motor, multiple stators are connected to different phases of the power supply, with each rotor interacting with the corresponding stator to produce rotational motion. The above-mentioned setup significantly improves efficiency and reduces harmonics in the motor’s operation. A multi-rotor synchronous motor uses multiple rotors that rotate in synchronization with the stator's magnetic field for applications that require high torque and precise control, such as in power generation or large industrial machinery.
As used herein, the terms “motor shaft” and “shaft” are used interchangeably and refer to a mechanical component that transmits rotational power from the electric motor to the vehicle's drivetrain for driving the wheels. The shaft is typically made of high-strength steel or durable materials to handle the forces and torque generated by the motor. The shaft is connected to the rotor and is designed to rotate at high speeds, converting the electrical energy from the motor into mechanical energy that propels the vehicle. The design of the shaft ensures smooth transmission of power while minimizing vibrations, noise, and wear over time. Types of motor shafts are solid shafts, hollow shafts, or spline shafts, depending on the specific application and power requirements. The key components of a motor shaft include the shaft, bearings to reduce friction and support rotation, a coupling to connect the shaft to other drivetrain components, and a flange or keyway for secure attachment. The shaft is designed to withstand high torque and operate efficiently across a range of conditions.
As used herein, the term “rotor” refers to a component of the electric motor that converts electrical energy into mechanical energy to propel the vehicle. The rotor is the rotating part of the motor that interacts with the stator's magnetic field to generate rotational motion. In EV motors, the rotor is composed of a set of conductive materials, such as copper or aluminium, and contains permanent magnets or coils depending on the motor type. The rotor is typically mounted on a shaft that transmits the rotational force to the vehicle’s drivetrain. The different types of rotors used in EVs are permanent magnet rotors and induction rotors. The permanent magnet rotors use embedded permanent magnets to create a constant magnetic field, which interacts with the stator's rotating field to generate torque. The induction rotors do not contain permanent magnets and instead generate their magnetic field through the interaction with the stator's alternating current. Components of the rotor include the rotor core (often made of laminated steel), windings or permanent magnets, a shaft, and bearings for smooth rotation. The rotor works by creating a magnetic field that is induced by the stator's electromagnetic forces, leading to the rotor’s rotation.
As used herein, the term “slip ring” refers to an electrical component used in rotating machinery to provide a continuous electrical connection between a stationary and a rotating part. The slip ring allows for the transfer of electrical power and signals from the stationary stator to the rotating rotor without the need for physical connections. The slip ring consists of a conductive ring that rotates with the rotor and is in constant contact with stationary brushes. The above-mentioned mechanism is crucial for delivering power to the rotors of the motor while allowing for continuous motion without interruption in the electrical connection. The types of slip rings used in multi-rotor-stator motors include carbon slip rings, metallic slip rings, and fibre optic slip rings.
As used herein, the term “brushes” refers to electrical components that maintain continuous contact with the rotating slip rings, allowing for the transfer of electrical power and signals between the stationary and rotating parts of the motor. The brushes are made of carbon, or a carbon composite material providing a stable electrical connection and minimizes wear and friction during the motor's rotation. The brushes are positioned to press against the slip rings and carry the current required to power the rotor windings. The constant electrical contact ensures the motor receives power to generate torque and rotation and allows for precise control over the motor's performance. The procedure for using brushes involves placing the brushes in a holder that ensures brushes remain in constant contact with the slip rings as they rotate. The brushes play a crucial role in maintaining uninterrupted electrical flow to the rotor, ensuring the motor operates smoothly, efficiently, and with minimal energy loss.
As used herein, the term “motor control unit” refers to an electronic system for managing and regulating the operation of the motor. The motor control unit ensures that the electric motor runs efficiently by controlling various parameters such as speed, torque, and direction. The MCU communicates with the vehicle's battery management system and other electronic control units (ECUs) to optimize performance, monitor the motor's health, and protect against faults like overvoltage, overheating, or current surges. The motor control unit processes data and sends commands to the motor’s power electronics, ensuring smooth and responsive performance under various driving conditions. The motor control unit is of different types, such as those used in permanent magnet synchronous motors (PMSM) or induction motors (IM). The key components of the MCU include the microcontroller or digital signal processor (DSP), power electronics such as inverters and converters, sensors for feedback (speed or temperature sensors), and communication interfaces for data exchange with the vehicle’s central control system. The MCU works by converting the DC power from the battery into AC power for the motor (in AC motor systems) through an inverter, adjusting the frequency and voltage to control motor speed and torque.
As used herein, the term “sensors” refers to devices that detect and measure various physical parameters of a vehicle, thereby providing critical data to the vehicle control systems. The sensors play a vital role in ensuring the efficient operation, safety, and performance of the vehicle by monitoring associated surrounding conditions, system states, and operating conditions. Various sensors may include (but not limited to) current sensors, voltage sensors, accelerometers, and wheel speed sensors. Additionally, sensors may also include GPS Sensors, pressure sensors, and radar sensors.
As used herein, the term “instruction signal” refers to an initial control signal that is sent to the motor’s power electronics to start or modify the motor's operation. The signal is typically generated by the vehicle's drive control system, which processes inputs from the driver (such as acceleration or braking) and sends corresponding instructions to the MCU. The first instruction signal is crucial because it triggers the motor control process, dictating parameters like motor start-up, speed, and direction. It ensures that the motor responds appropriately to the driver’s inputs while maintaining smooth and efficient operation. The first instruction signals are of different types depending on the motor system, such as a voltage signal, current signal, or digital signal, depending on whether the motor is a permanent magnet synchronous motor (PMSM), induction motor (IM), or another type. The components involved in processing this signal include the microcontroller or digital signal processor (DSP), sensors (e.g., throttle position sensor or torque sensor), and the inverter that converts the signal into the appropriate power for the motor. Upon receiving the first instruction signal, the MCU processes the data and adjusts the motor's operation by controlling the inverter, which then regulates the motor’s speed, torque, and other operating parameters.
As used herein, the terms “switches”, and “switching devices” are used interchangeably and refer to the components that control the flow of electricity to and from the battery pack, ensuring safe and efficient transmission from the battery pack. The switching devices comprise MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), relays, and contactors. The MOSFETs are used for high-speed switching and controlling charge and discharge currents. The relays and contactors isolate the battery during fault conditions or during switching between charge and discharge modes. The switching devices function by receiving control signals from a motor control unit, which monitors battery health, temperature, and voltage. When a specific condition (such as overvoltage, undervoltage, or thermal overload) is detected, the switching devices open or close the circuit, either allowing or cutting off power to the battery or external load, thus protecting the battery from damage and ensuring optimal performance.
As used herein, the term “top end” refers to a part of the brush that contacts the rotating slip ring in a multi-rotor-stator motor. The portion of the brush is typically made from high-conductivity materials such as, but not limited to, carbon, graphite, or copper composites, and transfers electrical power from the stationary components (such as the motor's stator) to the rotating components (such as the rotor). The top end is designed to maintain constant, stable contact with the slip ring, as the motor rotates. The constant contact ensures that the motor receives continuous electrical current, enabling the motor to generate torque and operate efficiently.
As used herein, the term “bottom end” refers to a stationary portion of the brush that interfaces with the brush holder or the electrical connection to the rest of the motor control system in a multi-rotor-stator motor. Unlike the top end, which maintains contact with the rotating slip ring, the bottom end is fixed and is responsible for transferring electrical current from the brush to the external circuit, typically the motor control unit or power source. The bottom end is designed to maintain a secure and stable electrical connection, ensuring the motor operates with the correct voltage and current. It is critical for the effective transfer of power, as any loss of connection here could result in power interruptions and motor instability.
Carbon brushes use copper or brass terminals at the bottom end, which provide a reliable and low-resistance connection to the power source. Graphite brushes may feature similar metal terminals but are used in systems requiring reduced wear and smoother operation under high temperatures. Spring-loaded or screw-mounted bottom ends can also be found, where springs or screws help maintain optimal pressure and connection between the brush and its holder. The method of operation involves the bottom end of the brush remaining stationary while securely transferring the current from the rotating slip ring, through the brush holder, and out to the rest of the motor control circuitry. This design ensures uninterrupted electrical flow, contributing to efficient motor performance and stable power delivery to the rotor.
As used herein, the term “positive terminal” refers to an electrical connection point at which the positive voltage is supplied to the motor's electrical system. The positive terminal serves as the point for power flows into the motor components, such as the rotor, via the slip rings and brushes. The terminal distributed the positive voltage to the motor's active circuits, allowing the rotor to receive the electrical energy needed for operation. Specifically, the positive terminal of the switch is critical for regulating the flow of power to each rotor, ensuring that the motor operates efficiently and in sync with the required torque and speed demands. Common types of the switches include mechanical switches, which physically open or close the circuit to control power delivery, and solid-state switches, which use electronic components to control the flow of electricity more efficiently, offering quicker response times and greater durability.
As used herein, the term “negative terminal” refers to a point at which the return path for the electrical current is connected to the system. The terminal completes the electrical circuit by providing a path for the current to flow back from the motor components, such as the rotor, to the power source or ground. The negative terminal works together with the positive terminal to allow controlled power distribution across the motor, ensuring that each rotor receives the necessary electrical current for operation. The negative terminal plays a key role in the overall electrical circuit of the motor, helping to regulate the flow of current to maintain balanced and efficient operation, particularly when managing multiple rotors in the system.
As used herein, the term “torque demand” refers to the amount of torque required by each rotor in a multi-rotor-stator motor to achieve the desired performance under specific operating conditions. The torque demand is a calculated value based on factors such as load requirements, speed, and the desired performance of the motor. The motor control unit computes this torque demand by taking inputs from sensors that monitor various parameters like rotor speed, current, and position. By adjusting the torque demand in real time, the motor control unit can ensure that each rotor produces the correct amount of torque to meet system requirements. The torque demand is a crucial parameter in ensuring that the motor operates efficiently, minimizes energy consumption, and avoids issues such as overloading or underperformance.
In accordance with an aspect of the present disclosure, there is provided a system for controlling output of a multi rotor-stator motor, the system comprises:
- a motor shaft;
- a plurality of rotors, sequentially mounted on the motor shaft;
- a plurality of slip rings electrically connected to each rotor, from the plurality of rotors;
- a plurality of brushes electrically connected to each slip ring, from the plurality of slip rings;
- a motor control unit communicably coupled with a plurality of sensors; and
- a plurality of switches configured to establish electrical connection between the motor control unit and the plurality of rotors,
wherein the motor control unit is configured to electrically connect and disconnect the plurality of rotors based on inputs received from the plurality of sensors.
Referring to figure 1, in accordance with an embodiment, there is described a system 100 for controlling output of a multi rotor-stator motor 102. The system comprises a motor shaft 104, a plurality of rotors 106, sequentially mounted on the motor shaft 104, a plurality of slip rings 108 electrically connected to each rotor 106A, from the plurality of rotors 106, a plurality of brushes 110 electrically connected to each slip ring 108A, from the plurality of slip rings 108, a motor control unit 112 communicably coupled with a plurality of sensors 114 and a plurality of switches 116 configured to establish electrical connection between the motor control unit 112 and the plurality of rotors 106. Further, the system 100 comprises the motor control unit 112, which is configured to electrically connect and disconnect the plurality of rotors 106 based on inputs received from the plurality of sensors 114. the each slip ring 108A comprises a top end 118 and a bottom end 120, and wherein each brush 110A from the plurality of brushes 110 is electrically connected to the top end 118 and the bottom end 120 of the each slip ring 108A. Furthermore, each switch 116A, from the plurality of switches 116, comprises a positive terminal 122 and a negative terminal 124.
The system for controlling the output of a multi-rotor-stator motor 102 functions by dynamically managing the electrical connection between the motor control unit 112 and the rotors 106 based on real-time data from the sensors 114. The motor shaft 104 serves as the central rotating component, with each rotor 106A sequentially mounted along the shaft 104. The rotors 106 are connected to the motor control unit 112 via a series of slip rings 108 and brushes 110 that transfer electrical power to the rotors 106. Further, the slip rings 108 provides a continuous electrical connection, and the brushes 110 maintain contact with the slip rings 108 to ensure uninterrupted power transfer despite the rotational movement. Furthermore, the motor control unit 112 is communicably coupled with a plurality of sensors 114 that monitor parameters such as rotor speed, position, current, and load. Based on this input, the motor control unit 112 calculates the necessary power adjustments and uses the switches 116 to establish or disconnect electrical connections to the rotors 106. Computation allows the motor 102 to selectively activate or deactivate rotors 106 based on current demand, ensuring efficient performance. Furthermore, the operation enhances the system’s flexibility and efficiency by allowing the motor 102 to adapt to changing conditions. As the motor control unit 112 receives sensor data indicating a change in load, speed, or performance requirements, MCU 112 selectively connects or disconnects specific rotors 106 via the switches 116. The dynamic control ensures that only the necessary rotors are powered, reducing energy consumption and optimizing torque output. For instance, when less power is needed, the control unit 112 disconnects one or more rotors, preserving energy and meeting the motor’s performance demands. Furthermore, the ability to independently control each rotor 106 helps in balancing the system 100 under varying load conditions, leading to more stable operation, reducing energy waste, and improved overall performance of the multi-rotor-stator motor.
In an embodiment, the each slip ring 108A comprises a top end 118 and a bottom end 120, and wherein each brush 110A from the plurality of brushes 110 is electrically connected to the top end 118 and the bottom end 120 of the each slip ring 108A. In the multi-rotor-stator motor 102, the slip rings 108A and brushes 110A play a critical role in transferring electrical power to and from the rotating parts of the motor 102. Each slip ring 108 consists of a top end 118 and a bottom end 120, with brushes 110A connected to both ends. The brushes 110 ensure continuous electrical contact with the slip ring 108 as brush 110 rotates, maintaining the flow of current to the rotors. By having electrical connections on both the top 118 and bottom end 120 of each slip ring 108A allows for more efficient and stable power transmission. The configuration is essential for controlling the power output and regulating the speed and torque of each rotor in a multi-rotor setup, ensuring smooth and precise motor control. The working involves using slip rings 108 and brushes 110 to facilitate constant electrical contact between the rotating and stationary parts of the motor 102. As the rotors spin, the slip rings 108 rotate along also, but the brushes 110 maintain a steady connection to transmit current. The above-mentioned setup is crucial in maintaining synchronous operation of all rotors 106, allowing for controlled output across multiple stators. Consequently, the synchronous operation enables fine control over each rotor’s performance, improving the motor's 102 overall efficiency, reliability, and longevity. The dual electrical connections on each slip ring 108A enhance power distribution, reduce wear on the brushes 110, and minimize electrical losses, contributing to a smoother motor operation with optimized power output.
In an embodiment, each switch 116A, from the plurality of switches 116 comprises a positive terminal 122 and a negative terminal 124.
In an embodiment, the top end 118 of the each slip ring 108A is connected to the positive terminal 122 of each switch 116A via the each brush 110A and the bottom end 120 of the each slip ring 108A is connected to the negative terminal 124 of each switch 116A via the each brush 110A. The top end 118 of each slip ring is electrically connected to the positive terminal 122 of a switch 116A via the brush 110A and the bottom end 120 is connected to the negative terminal 124 of the same switch 116A through another brush 110A. The above-mentioned configuration allows for the controlled distribution of electrical power to each rotor 106A. Specifically, as the switch 116A is activated, the current flow between the slip rings 108 and the motor windings, determining the voltage and current that each rotor receives. The brushes 110 maintain continuous contact with the rotating slip rings 108, ensuring uninterrupted power transfer despite the rotational movement, and the switches control the polarity and current direction, enabling precise modulation of each rotor's operation. The work involves synchronized electrical control via the slip rings 108, brushes 110, and switches 116. As the motor 102 rotates, the brushes 110 maintain electrical contact with the slip rings 108, allowing the current to flow through the switches, which control the polarity of the current supplied to the rotors 106. The arrangement ensures that each rotor 106A receives the appropriate electrical input to generate the required torque and speed. The configuration is advantageous for allowing independent control of each rotor's 106A output by adjusting the current flow and polarity through the switches 116. Consequently, the independent control leads to improved efficiency, enhanced control over the motor's performance, and the ability to fine-tune the motor's output based on load conditions.
In an embodiment, the motor control unit 112 is configured to compute a torque demand based on the inputs received from the plurality of sensors 114. The motor control unit 112 in a multi-rotor-stator motor 102 processes inputs from a range of sensors 114 to compute a torque demand. The sensors 114 monitor parameters such as, but not limited to, rotor speed, position, current, and temperature, providing real-time data about the motor's operating conditions. The motor control unit 112 uses the sensor data to calculate the torque requirement for each rotor 106A, ensuring that the motor 102 operates efficiently and meets the performance demands of the system. By constantly adjusting the torque output based on the sensor inputs, the motor control unit 112 optimizes the operation of the motor 102, responding to dynamic changes in load, speed, or other operating conditions. As the torque demand is calculated and adjusted in real time, the motor control unit 112 ensures that the power delivered to each rotor 106A is matched to a specific requirement, leading to better overall efficiency and performance. The responsive control minimizes energy wastage, improves system stability, and prevents overloads, ensuring that the motor runs smoothly under varying loads. Additionally, by using sensor 114 feedback, the motor 102 automatically compensates for external disturbances or changes in the operating environment, making the system 100 more robust, reliable, and adaptable to different operating conditions.
In an embodiment, the motor control unit 112 is configured to compare the computed torque demand with a current torque value of the multi rotor-stator motor 102 and derive a torque deviation. The motor control unit 112 in a multi-rotor-stator motor 102 is designed to compare the computed torque demand with the actual current torque value of the motor 102, which is derived from real-time data such as rotor speed and current measurements. Specifically, as the comparison is performed, the motor control unit 112 calculates a torque deviation, which is the difference between the desired torque and the actual torque being produced. The torque deviation serves as a key indicator of the motor's performance relative to the required performance. In case a deviation is detected, the motor control unit 112 adjusts to the power supplied to the motor 102, thereby ensuring that the motor 102 operates at the desired torque level. The feedback loop continuously monitors and adapts the motor's output to match the calculated torque demand, maintaining optimal performance. Continuous comparing of the computed torque demand with the actual torque and addressing any deviation, the system 100 ensures that each rotor 106A operates efficiently and within an optimal performance range. Consequently, the comparison results in precision in torque control, better energy efficiency, and enhanced responsiveness to changing operating conditions. The precise control minimizes the risk of overloads or underperformance, contributing to greater system stability, longer motor lifespan, and reduced energy consumption.
In an embodiment, the motor control unit 112 is configured to generate an instruction signal based on the identified number of rotors and send the generated instruction to the each switch 116A via the positive terminal 122 and the negative terminal 124. The motor control unit 112 generates an instruction signal based on the identified number of rotors in a multi-rotor-stator motor. The number of rotors is detected using sensors and the motor control unit 112 calculates the appropriate control strategy for each rotor. The detection involves adjusting the signal to each switch 116A, sending the instruction via both the positive terminal 122 and the negative terminal 124. The instruction signal determines the required adjustments in the power supplied to each rotor 106A, ensuring that the motor 102 operates efficiently, and that each rotor 106A receives the correct current and voltage according to its specific requirements. Further, the motor control unit 112 ensures that each rotor’s 106A performance is optimized based on the motor’s configuration. Specifically, sending altered instruction signals to each switch 116A, the system adapts the power supplied to each rotor 106A in real time, responding to changes in load, speed, or other conditions. The real-time adjustment enhances the overall efficiency and performance of the motor 102, as each rotor 106A is independently controlled based on the unique requirements. Furthermore, the control strategy reduces energy consumption, prevents motor overloads, and ensures consistent performance across all rotors.
In an embodiment, the motor control unit 112 is configured to electrically connect and disconnect at least one rotor from the plurality of rotors 106. The motor control unit 112 dynamically manages the operation of a multi-rotor-stator motor 102 by electrically connecting and disconnecting one or more rotors from the system. The control unit 112 engages or disengages specific rotors based on the motor's operational needs, adjusting the overall power output. The controlling involves selectively activating or deactivating the switches 116 associated with each rotor 106A, which in turn connects or disconnects the rotors to the power supply. Specifically, as a rotor 106 is disconnected, the motor control unit 112 ensures that the remaining connected rotors continue to operate efficiently, maintaining system balance and optimal performance across the motor. The above-mentioned functionality allows for precise control over the number of active rotors at any given time, enabling efficient management of energy consumption and motor load. The selective connecting or disconnecting rotors, the motor control unit 112 optimizes the motor’s 102 performance under varying conditions. For instance, as less power is needed, the control unit 112 disconnects certain rotors, reducing energy consumption and maintaining required torque and speed from the remaining active rotors. The controlling helps to extend the lifespan of the motor 102 by reducing wear on unused rotors and minimizing overheating risks.
In accordance with a second aspect, there is described a method of controlling output of a multi rotor-stator motor, the method comprises:
- receiving inputs from the plurality of sensors to a motor control unit;
- comparing computed torque demand with a current torque value and deriving a torque deviation via the motor control unit;
- identifying a number of rotors, from the plurality of rotors, based on the derived torque deviation via the motor control unit;
- generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches via the second terminal via the motor control unit; and
- electrically connecting and disconnecting at least one rotor from the plurality of rotors via the motor control unit.
Figure 2 describes a method 200 of controlling output of a multi rotor-stator motor. The method 200 starts at a step 202. At the step 202, the method 200 comprises receiving inputs from the plurality of sensors 114 to the motor control unit 112. At a step 204, the method 200 comprises comparing computed torque demand with a current torque value and deriving a torque deviation via the motor control unit 112. At a step 206, the method 200 comprises identifying a number of rotors, from the plurality of rotors 106, based on the derived torque deviation via the motor control unit 112. At a step 208, the method 200 comprises generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches 116. At a step 210, the method 200 comprises electrically connecting and disconnecting at least one rotor from the plurality of rotors 106 via the motor control unit 116.
In an embodiment, the method 200 comprises computing a torque demand based on the inputs received from the plurality of sensors 114.
In an embodiment, the method 200 comprises comparing the computed torque demand with a current torque value and deriving a torque deviation via the motor control unit 112.
In an embodiment, the method 200 comprises identifying a number of rotors, from the plurality of rotors 106, need to be electrically connected and disconnected, based on the derived torque deviation via the motor control unit 112.
In an embodiment, the method 200 comprises generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches 116.
In an embodiment, the method 200 comprises electrically connecting and disconnecting at least one rotor from the plurality of rotors 106.
In an embodiment, the method 200 comprises computing a torque demand based on the inputs received from the plurality of sensors 114. Further, the method 200 comprises comparing the computed torque demand with a current torque value and deriving a torque deviation via the motor control unit 112. Furthermore, the method 200 comprises identifying a number of rotors and disconnected, based on the derived torque deviation via the motor control unit 112. Furthermore, the method 200 comprises generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches 116. Furthermore, the method 200 comprises electrically connecting and disconnecting at least one rotor from the plurality of rotors 106.
In an embodiment, the method 200 comprises receiving inputs from the plurality of sensors 114 to the motor control unit 112. Furthermore, the method 200 comprises comparing computed torque demand with a current torque value and deriving a torque deviation via the motor control unit 112. Furthermore, the method 200 comprises identifying a number of rotors, from the plurality of rotors 106, based on the derived torque deviation via the motor control unit 112. Furthermore, the method 200 comprises generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches 116. Furthermore, the method 200 comprises electrically connecting and disconnecting at least one rotor from the plurality of rotors 106 via the motor control unit 112.
Based on the above-mentioned embodiments, the present disclosure provides significant advantages of improved power efficiency, enhanced torque density, and greater control over the motor output. Consequently, the system results in more efficient energy usage, reduced heat generation, and the ability to dynamically adjust motor output for applications requiring variable power.
It would be appreciated that all the explanations and embodiments of the system 100 also apply mutatis-mutandis to the method 200.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly specified or limited, the terms “disposed,” “mounted,” and “connected” are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected, either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Modifications to embodiments and combinations of different embodiments of the present disclosure described in the foregoing are possible without departing from the scope of the present disclosure as defined by the accompanying claims. Expressions such as “including”, “comprising”, “incorporating”, “have”, and “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural where appropriate.
Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the present disclosure, the drawings, and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
,CLAIMS:WE CLAIM:
1. A system (100) for controlling output of a multi rotor-stator motor (102), the system comprises:
- a motor shaft (104);
- a plurality of rotors (106), sequentially mounted on the motor shaft (104);
- a plurality of slip rings (108) electrically connected to each rotor (106A), from the plurality of rotors (106);
- a plurality of brushes (110) electrically connected to each slip ring (108A), from the plurality of slip rings (108);
- a motor control unit (112) communicably coupled with a plurality of sensors (114); and
- a plurality of switches (116) configured to establish electrical connection between the motor control unit (112) and the plurality of rotors (106),
wherein the motor control unit (112) is configured to electrically connect and disconnect the plurality of rotors (106) based on inputs received from the plurality of sensors (114).

2. The system (100) as claimed in claim 1, wherein the each slip ring (108A) comprises a top end (118) and a bottom end (120) and wherein each brush (110A) from the plurality of brushes (110) is electrically connected to the top end (118) and the bottom end (120) of the each slip ring (108A).

3. The system (100) as claimed in claim 1, wherein each switch (116A), from the plurality of switches (116) comprises a positive terminal (122) and a negative terminal (124).

4. The system (100) as claimed in claim 1, wherein the top end (118) of the each slip ring (108A) is connected to the positive terminal (122) of each switch (116A) via the each brush (110A) and wherein the bottom end (120) of the each slip ring (108A) is connected to the negative terminal (124) of each switch (116A) via the each brush (110A).

5. The system (100) as claimed in claim 1, wherein the motor control unit (112) is configured to compute a torque demand based on the inputs received from the plurality of sensors (114).

6. The system (100) as claimed in claim 1, wherein the motor control unit (112) is configured to compare the computed torque demand with a current torque value of the multi rotor-stator motor (102) and derive a torque deviation.

7. The system (100) as claimed in claim 1, wherein the motor control unit (112) is configured to identify a number of rotors, from the plurality of rotors (106), needs to be electrically connected and disconnected, based on the derived torque deviation.

8. The system (100) as claimed in claim 1, wherein the motor control unit (112) is configured to generate an instruction signal based on the identified number of rotors and send the generated instruction to the each switch (116A) via the positive terminal (122) and the negative terminal (124).

9. The system (100) as claimed in claim 1, wherein the motor control unit (112) is configured to electrically connect and disconnect at least one rotor from the plurality of rotors (106).

10. A method (200) of controlling output of a multi rotor-stator motor (102), the method (200) comprises:
- receiving inputs from the plurality of sensors (114) to a motor control unit (112);
- comparing a computed torque demand with a current torque value and deriving a torque deviation via the motor control unit (112);
- identifying a number of rotors, from the plurality of rotors, based on the derived torque deviation via the motor control unit (112);
- generating an instruction signal based on the identified number of rotors and sending the generated instruction signal to the plurality of switches (116); and
- electrically connecting and disconnecting at least one rotor from the plurality of rotors via the motor control unit (112).