DESC:FIELD OF THE INVENTION

The present disclosure relates to motor control systems and more particularly, relates to a motor control system and method for regulating and controlling the speed of a motor.

BACKGROUND

Electrical appliances such as table fans, pedestal fans, or wall fans, are controlled using three different windings with a three-speed setting. The three-speed setting requires more process while winding a motor. Also, there is a need for more switches to control the fan speed with remote or mechanical switches. Such requirement limits to a certain fixed speed based on the taping of the motor winding with a maximum of three-speed settings. However, the landscape of the motor speed control systems for the electrical appliances has been marred by inherent limitations concerning adaptability and efficiency. The motor speed control systems predominantly relied upon manual switches or remote controls featuring pre-set speed settings, i.e., the three-speed setting and typically having a limited range, such as low, medium, and high speeds. The limited range of speeds is facilitated by multiple winding configurations within the motor such that each winding designates a specific speed setting. The motor speed control systems mainly served fundamental purposes and functionalities.

However, the systems demonstrated shortcomings in dynamically adjusting motor speed in real-time in response to evolving user preferences and environmental conditions. Moreover, manual control or remote-control interfaces often deliver a static and cumbersome user experience, lacking seamless adaptability to evolving needs or precise energy consumption optimization. Additionally, the manual control or remote-control interfaces frequently lacked intuitive features and real-time feedback mechanisms, diminishing user convenience and overall satisfaction.

Therefore, there is a need for a dynamic speed control system for motors to facilitate multiple speed settings with real-time feedback mechanisms and enhanced user convenience.

SUMMARY

This summary is provided to introduce a selection of concepts, in a simplified format, that are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention and nor is it intended for determining the scope of the invention.

In an embodiment, a motor control system is disclosed. The motor control system includes a rectification module, a processing unit, and a chopping module. The rectification module is configured to convert an input alternating current (AC) voltage to a rectified direct current (DC) voltage. The processing unit is operationally coupled to the rectification module. The chopping module is operationally coupled to the processing unit. The processing unit is configured to generate a Pulse Width Modulation (PWM) signal based at least on the verification by the chopping module. Further, the processing unit transmits the PWM signal to the chopping module based at least on user inputs. Furthermore, the processing unit triggers the chopping module to adjust the PWM signal and adjust the speed of the motor based on the adjusted PWM signal.

In another embodiment, a method for regulating and controlling the speed of a motor is disclosed. The method includes generating a Pulse Width Modulation (PWM) signal based at least on the verification by a chopping module. Further, the method includes transmitting the PWM signal to the chopping module is based at least on user inputs. Furthermore, the method includes triggering the chopping module to adjust the PWM signal and adjust the speed of the motor based on the adjusted PWM signal.

In an embodiment, the motor control system and method utilizes pulse width modulation and synchronized AC voltage adjustments to enable precise and dynamic regulation of motor speed, enhancing operational efficiency. The motor control system allows speed control of a single taping motor that facilitates a simple installation process, reduces manufacturing costs, and enhances scalability. Additionally, the user interface is incorporated within the system that facilitates seamless interaction thereby providing users with intuitive control over speed settings and enhanced overall user experience. Further, the motor control system includes synchronization with the AC zero cross point that ensures optimal performance and stability. Also, the ability to operate on a continuous 10 milliseconds cycle provides a real-time response.

To further clarify the advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

Figure 1 illustrates a schematic diagram of a motor control system, according to an embodiment of the present disclosure;

Figure 2 illustrates a detailed block diagram of the motor control system, according to an embodiment of the present disclosure; and

Figure 3 illustrates a flow chart depicting a method for regulating and controlling the speed of a motor, in accordance with an embodiment of the present disclosure.

Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present invention. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

DETAILED DESCRIPTION OF FIGURES

For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skilled in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.

The term “some” as used herein is defined as “none, or one, or more than one, or all.” Accordingly, the terms “none,” “one,” “more than one,” “more than one, but not all” or “all” would all fall under the definition of “some.” The term “some embodiments” may refer to no embodiments or to one embodiment or to several embodiments or to all embodiments. Accordingly, the term “some embodiments” is defined as meaning “no embodiment, or one embodiment, or more than one embodiment, or all embodiments.”

The terminology and structure employed herein is for describing, teaching, and illuminating some embodiments and their specific features and elements and does not limit, restrict, or reduce the spirit and scope of the claims or their equivalents.

More specifically, any terms used herein such as but not limited to “includes,” “comprises,” “has,” “consists,” and grammatical variants thereof do NOT specify an exact limitation or restriction and certainly do NOT exclude the possible addition of one or more features or elements, unless otherwise stated, and furthermore must NOT be taken to exclude the possible removal of one or more of the listed features and elements, unless otherwise stated with the limiting language “MUST comprise” or “NEEDS TO include.”

Whether or not a certain feature or element was limited to being used only once, either way it may still be referred to as “one or more features” or “one or more elements” or “at least one feature” or “at least one element.” Furthermore, the use of the terms “one or more” or “at least one” feature or element do NOT preclude there being none of that feature or element, unless otherwise specified by limiting language such as “there NEEDS to be one or more . . . ” or “one or more element is REQUIRED.”

Unless otherwise defined, all terms, and especially any technical and/or scientific terms, used herein may be taken to have the same meaning as commonly understood by one having an ordinary skill in the art.

Reference is made herein to some “embodiments.” It should be understood that an embodiment is an example of a possible implementation of any features and/or elements presented in the attached claims. Some embodiments have been described for the purpose of illuminating one or more of the potential ways in which the specific features and/or elements of the attached claims fulfill the requirements of uniqueness, utility, and non-obviousness.

Use of the phrases and/or terms such as but not limited to “a first embodiment,” “a further embodiment,” “an alternate embodiment,” “one embodiment,” “an embodiment,” “multiple embodiments,” “some embodiments,” “other embodiments,” “further embodiment”, “furthermore embodiment”, “an additional embodiment” or variants thereof do NOT necessarily refer to the same embodiments. Unless otherwise specified, one or more particular features and/or elements described in connection with one or more embodiments may be found in one embodiment or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although one or more features and/or elements may be described herein in the context of only a single embodiment, or alternatively in the context of more than one embodiment, or further alternatively in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any features and/or elements described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.

Any particular and all details set forth herein are used in the context of some embodiments and therefore should NOT be necessarily taken as limiting factors to the attached claims. The attached claims and their legal equivalents can be realized in the context of embodiments other than the ones used as illustrative examples in the description below.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Figure 1 illustrates a schematic diagram of a motor control system 100, according to an embodiment of the present disclosure. The motor control system 100 may operate a single taping/winding motor and be implemented for electrical appliances like, tabletop fans, pedestal fans, wall fans, etc. Such electrical appliances may facilitate a single winding induction motor or simply referred hereinafter as a motor. The motor may be adapted to be operable on multiple speed settings. The motor control system 100 may eliminate the conventional process of wire taping during motor assembly.

The motor control system 100 may include a rectification module 102, a processing unit 104, a user interface 106, a chopping module 108, a motor module 110, and a detection module 112. In an embodiment, when an electrical appliance, like the fan, may be turned ON, an input Alternating Current (AC) may be supplied to the rectification module 102. The rectified Direct Current (DC) may be used for an auxiliary power supply for the processing unit 104. In some embodiments, the rectified DC may be obtained by shifting the negative voltage of the input AC to a positive voltage. Such shifting may be facilitated by changing sine voltage to a rectified sine wave, by the rectification module 102.

The processing unit 104 may be configured to start a booting process, once the rectified DC is supplied. The processing unit 104 may be configured to verify user inputs or previously stored speed settings. The user inputs may be received from the user interface 106 and the previously stored speed settings may correspond to the user inputs that may be previously fed to the user interface 106 prior to the booting process.

In an embodiment, the processing unit 104 may include a Micro-Controller Unit (MCU) configured to control the sensing of the user inputs and send the signals to the chopping module 108. Further, the processing unit 104 may correspond to the MCU or a controller having a memory. The memory, in one example, may store the instructions to carry out the operations of the processing unit 104.

The processing unit 104 may be a single processor or several processors, all of which could include multiple computing units. The processing unit 104 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, the processing unit 104 may be configured to fetch and execute computer-readable instructions and data stored in the memory. The processing unit 104 may include one or a plurality of processors. At this time, one or a plurality of processors may be a general-purpose processor, such as a central processing unit (CPU), an application processor (AP), or the like, a graphics-only processing unit such as a graphics processing unit (GPU), a visual processing unit (VPU), and/or an AI-dedicated processor such as a neural processing unit (NPU). The one or a plurality of processors control the processing of the input data in accordance with a predefined operating rule or artificial intelligence (AI) model stored in the non-volatile memory and the volatile memory. The predefined operating rule or machine learning model is provided through training or learning.

The memory may include any non-transitory computer-readable medium known in the art including, for example, volatile memory, such as static random-access memory (SRAM) and dynamic random-access memory (DRAM), and/or non-volatile memory, such as read-only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes.

The rectification module 102 and the chopping module 108, amongst other things, include routines, programs, objects, components, data structures, etc., which perform particular tasks or implement data types. The rectification module 102 and the chopping module 108 may also be implemented as, signal processor(s), state machine(s), logic circuitries, and/or any other device or component that manipulates signals based on operational instructions.

Further, the rectification module 102 and the chopping module 108 may be implemented in hardware, instructions executed by the processing unit 104, or by a combination thereof. The processing unit 104 may comprise a computer, a processor, such as the processing unit 104, a state machine, a logic array, or any other suitable devices capable of processing instructions. The processing unit 104 may be a general-purpose processor which executes instructions to cause the general-purpose processor to perform the required tasks or, the processing unit 104 may be dedicated to performing the required functions. In another embodiment of the present disclosure, the rectification module 102 and the chopping module 108 may be machine-readable instructions (software) that, when executed by the processing unit 104, perform any of the described functionalities. Further, the data serves, amongst other things, as a repository for storing data processed, received, and generated by one or more of the rectification module 102 and the chopping module 108.

The chopping module 108 may receive signals from the processing unit 104 based on the verified user inputs. It may be noted that the user inputs are in relation to the required speed by a user. In some embodiments, the chopping module 108 may correspond to a chopper that may be adapted to chop the input AC by controlling a Root Mean Square (RMS) voltage. The chopping of the input AC voltage and control of the RMS voltage may facilitate the reduction of the motor based on the available RMS voltage. In some embodiments, the chopping module 108 may be adapted to repeat the chopping of the input AC and control the RMS voltage at specific intervals. In some embodiments, the specific intervals may be 10 milliseconds. In some embodiments, the processing unit 104 may be configured to repeat monitoring at AC zero cross point, after every 10 milliseconds. It may be noted that the zero cross point corresponds to a process of completion of a crest and starting of a trough in a sine wave.

In an embodiment, the motor driving unit of the motor module 110 may be an induction motor with a single winding, without departing from the scope of the present disclosure. In another embodiment, the motor driving unit of the motor module 110 may be a universal motor or another type of motor, without departing from the scope of the present disclosure.

The motor module 110 may be configured to adjust the speed of the motor based at least on inputs from the processing unit 104. It may be noted that the chopping module 108 may act as a voltage controlling unit between the processing unit 104 and the motor module 110. The motor module 110 may also include the motor driving unit that may be adapted to receive motor driving signals to drive the motor. In one embodiment, the chopping module 108 may be integrated within the motor driving unit. In one embodiment, the motor driving unit may facilitate communication of the motor driving signals from the chopping module 108 to the motor module 110.

The processing unit 104 may be configured to process data from all inputs like monitoring the user inputs and based on the processed data, the processing unit 104 may adjust pulse width modulation signals at the chopping module 108. In some embodiments, the processing unit 104 may be configured to process one or more parameters, like, user feedback, speed control, and indication to the user. The user interface 106 may be configured to monitor user speed commands. The user interface 106 may receive the user inputs related to the one or more parameters for adjusting the speed of the electrical appliances, like the fan. Further, the user inputs may be processed by verification and fed to the chopping module 108.

The chopping module 108 may be configured to control the speed of the motor based on the user inputs by varying the voltage level of the input AC voltage. The processing unit 104 may provide feedback related to the speed control of the motor to the chopping module 108. Based on the received feedback, as an input command, the chopping module 108 may be configured to supply the required amount of the input AC to the motor module 110. In some embodiments, the chopping module 108 may include at least two internal units. A first unit may be configured to control the input AC. A second unit may be configured to take feedback from the processing unit 104. The second unit may also transmit signals to the first unit based on the feedback from the processing unit 104. It may be noted that a 3 Kilovolt (KV) isolation may be between the processing unit 104 and the input AC voltage. In some embodiments, the motor module 110 may adjust the speed of the motor and thereby the electrical appliance, like a fan, based on the inputs from the processing unit 104. The processing unit 104 may adjust the speed of the motor based on the user inputs and thereby achieve a plurality of speed settings with a single winding of the motor.

Figure 2 illustrates a detailed block diagram of the motor control system 100, according to an embodiment of the present disclosure. The motor control system 100 may include the rectification module 102 may configure to convert the input AC voltage to the rectified DC voltage. The processing unit 104 may be operationally coupled to the rectification module 102. The chopping module 108 may be operationally coupled to the processing unit 104. The processing unit 104 may configured to generate a Pulse Width Modulation (PWM) signal based at least on the verification by the chopping module 108. Further, the processing unit 104 may transmit the PWM signal to the chopping module 108 based at least on user inputs. Further, the processing unit 104 may trigger the chopping module 108 to adjust the PWM signal and adjust the speed of the motor based on the adjusted PWM signal.

The rectification module 102 may correspond to a Switched-Mode Power Supply (SMPS) section. The rectification module 102 may be coupled to an input connector 114 that may be configured to supply the input AC voltage, e.g., 100 Vac to 400 Vac, 0.50 Ampere Max. with 50-60 Hertz (Hz). The input connector 114 may be coupled to an input protection section 116-1 that may be further coupled to the chopping module 108. It may be noted that a portion of the input AC voltage may be supplied to the detection module 112 via the input protection section 116-1. The detection module 112 may correspond to a zero cross detector. The rectification module 102 may include another input protection section 116-2. The input AC voltage may be received by an AC to DC rectification 118 via the another input protection section 116-2. The AC to DC rectification 118 may supply the rectified DC to an input filter section 120. Further, the input filter section 120 may prevent electromagnetic interference from affecting other components of the rectification module 102.

Further, the input filter section 120 may be coupled to a FlyBack Transformer (FBT) 122. The FBT 122 may be configured to isolate primary and secondary winding of a transformer for given multiple inputs and provide multiple output voltages, which may be positive or negative. The FBT 122 may be coupled to a current sensing section 124 that may be further coupled to a SMPS switch controller 126. The current sensing section 124 may be a resister that is configured to sense the rectified DC. In some embodiments, the current sensing section 124 may be an operational amplifier to amplify the current-sense signal may reduce cost and improve noise performance and efficiency. Further, the SMPS switch controller 126 may be configured to transmit one or more signals to the FBT 122 to provide positive voltage outputs.

Further, the FBT 122 may be coupled with a snubber circuit 128. The snubber circuit 128 may protect downstream circuit overvoltage spikes, that may arise during a reverse recovery process. For instance, the snubber circuit 128 includes a capacitor and a resistor connected in parallel. The FBT 122 may supply the rectified DC to a secondary rectification section 130. It may be noted that the rectified DC may correspond to an auxiliary voltage, supplied to the SMPS switch controller 126 via a 15V auxiliary voltage section 132. In some embodiments, a Primary Side Regulation (PSR) sensing 134 may be configured to receive the rectified DC from the FBT 122 and regulate output for circuitry of the rectification module 102. Further, the secondary rectification section 130 may be coupled to a secondary filter section 136 that may be configured to further prevent electromagnetic interference. The rectification module 102 may be configured to supply an output of 3.3V DC.

In some embodiments, a 3.3 V DC may be supplied to the detection module 112, and the processing unit 104. As discussed earlier, the detection module 112 may receive the input AC via the input protection section 116-1. The detection module 112 may include a full wave rectifier 138 and an opto zero cross detector section 140. The full wave rectifier 138 may be configured to rectify a negative component of the input AC voltage to a positive voltage. Further, the full wave rectifier 138 converts into DC (pulse current) utilizing a diode bridge configuration. The opto zero cross detector 140 may be configured to detect when the AC crosses through a ground potential. The detection module 112 may supply a zero cross-signal output to the processing unit 104.

The processing unit 104 may be operationally coupled to the user interface 106, as mentioned above. The processing unit 104 may correspond to a Micro-Controller Unit (MCU) which may control things like sensing the user input signals and sending the signals to the chopper. The user interface 106 may include a push button input 142, an infrared (IR) receiver 144, and a remote key data. The push button 142 may send the High-low signal to the MCU. The user presses the push button 142 and send signal to Speed Control Logic which may compare the current speed and increase the speed to +1 Speed.

In an embodiment, the user interface 106 may include a single push button input 142 and adapted to be cyclical in nature Off-On – 1-2-3…..5-6-N, without departing from the scope of the present disclosure. In another embodiment, the user interface 106 may include a muptiple push buttons input and adapted to be cyclical in nature Off-On – 1-2-3…..5-6-N, without departing from the scope of the present disclosure.

In an embodiment, the remote key data may receive input signals from a mobile device, smartphones, smartwatches, tablets, laptops, computers, or any other such electronic devices, without departing from the scope of the present disclosure. The IR Receiver 144 may receive the IR data from the remote when the user presses the remote key, The received remote key data may be sent to the MCU block then the MCU may Compare the stored remote key data and react accordgly on the remote key data. The processing unit 104 may receive the user inputs via the push button input 142. The processing unit 104 may be configured to supply a main motor driving signal to the motor driving unit, which in one embodiment, may include the chopping module 108. Alternatively, the chopping module 108 may communicate with the motor driving unit to relay the main motor driving signal. The chopping module 108 may include an opto driving section 146 and a triode for AC switch control section 148. The opto driving section 146 may be configured to detect and transfer signals to the triode for an AC switch control section 148. The triode for the AC switch control section 148 may be configured to conduct current in either direction when triggered. Further, the chopping module 108 via the motor driving unit, may be adapted to operate the motor module 110. The motor module 110 may correspond to a main motor connector that may be adapted to receive the input AC voltage and the main motor driving signal.

In some embodiments, the rectification module 102 includes a diode-based rectification circuitry that may be adapted to convert the input AC into rectified DC. In some embodiments, the chopping module 108 may include a control module that may be adapted to control the AC voltage. A receiver module may be adapted to receive feedback signals from the processing unit 104. An execution module provides control signals to the control module with isolation of 3KV between the processing unit and the input AC voltage. In some embodiments, the adjustment of the PWM signals at the chopping module 108 may include modifying the PWM signals based at least on the user speed commands and the feedback from the processing unit 104.

Figure 3 illustrates a flow chart depicting a method 200 for regulating and controlling the speed of a motor, in accordance with an embodiment of the present disclosure. The order in which the method 200 steps are described below is not intended to be construed as a limitation, and any number of the described method steps can be combined in any appropriate order to execute the method or an alternative method. Additionally, individual steps may be deleted from the method 200 without departing from the spirit and scope of the subject matter described herein.

The method 200 begins at step 202, by generating a pulse width modulation (PWM) signal based at least on the verification by the chopping module 108. Further, at step 204, transmitting the PWM signal to the chopping module 108 based at least on user inputs received from the user interface 106. Furthermore, at step 206, triggering the chopping module 108 to adjust the PWM signal and adjust the speed of the motor based on the adjusted PWM signal.

In some embodiments, the method 200 further includes providing feedback signals, via the processing unit 104, to the chopping module 108 for precise speed regulation. Successively, maintaining the speed of the motor based on available Root Mean Square (RMS) voltage.

In some embodiments, the motor control system 100 facilitates the utilization of the pulse width modulation signals and synchronized AC voltage adjustments to enable precise and dynamic regulation of motor speed. The motor control system 100 also offers a single-taping or single-winding motor, that facilitates a simple installation process, reduces manufacturing costs, and enhances scalability. Additionally, the user interface incorporated within the motor control system 100 facilitates seamless interaction thereby providing users with intuitive control over speed settings and enhanced overall user experience. Further, the motor control system 100 may include synchronization with the AC zero cross point that ensures optimal performance and stability. Also, the ability to operate on a continuous 10 milliseconds cycle provides a real-time response.

While specific language has been used to describe the present subject matter, any limitations arising on account thereto are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein. The drawings and the foregoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. ,CLAIMS:1. A motor control system (100) comprising:
a rectification module (102) configured to convert an input alternating current (AC) voltage to a rectified direct current (DC) voltage;
a processing unit (104) operationally coupled to the rectification module (102); and
a chopping module (108) operationally coupled to the processing unit (104),
wherein the processing unit (104) configured to:
generate a Pulse Width Modulation (PWM) signal based at least on the verification by the chopping module (108);
transmit the PWM signal to the chopping module (108) based at least on user inputs; and
trigger the chopping module (108) to adjust the PWM signal and adjust the speed of the motor based on the adjusted PWM signal.

2. The motor control system (100) as claimed in claim 1, wherein the rectified DC is obtained by shifting a negative voltage of the input AC to a positive voltage.

3. The motor control system (100) as claimed in claim 1, comprises a motor module (110) having a motor driving unit adapted to receive motor driving signals to drive the motor based on an adjusted PWM signal.

4. The motor control system (100) as claimed in claim 3, wherein the motor driving unit of the motor module (110) is an induction motor with a single winding.

5. The motor control system (100) as claimed in claim 1, comprises a detection module (112) configured to receive the input AC and adapted to supply a zero cross-signal output to the processing unit (104).

6. The motor control system (100) as claimed in claim 1, wherein the processing unit (104) comprises a Micro-Controller Unit (MCU) configured to control the sensing of the user inputs and sending the signals to the chopping module (108).

7. The motor control system (100) as claimed in claim 6, wherein the user interface (106) comprises a push button input (142), an infrared (IR) receiver (144), and a remote key data, wherein
the push button input (142) is configured to send a high-low signal to the MCU; and
the infrared (IR) receiver (144) is configured to receive IR data from the remote key data and send it to the MCU.

8. A method (200) for regulating and controlling the speed of a motor, the method (200) comprising:
generating a Pulse Width Modulation (PWM) signal based at least on the verification by a chopping module (108);
transmitting the PWM signal to the chopping module (108) based at least on user inputs; and
triggering the chopping module (108) to adjust the PWM signal and adjust the speed of the motor based on the adjusted PWM signal.

9. The method (200) as claimed in claim 8, wherein the rectified DC is obtained by shifting a negative voltage of the input AC to a positive voltage.

10. The method (200) as claimed in claim 8, comprises a motor module (110) having a motor driving unit adapted to receive motor driving signals to drive the motor based on an adjusted PWM signal.