Claims:1. A method of operating a motor 100 by sending a signalling scheme, the method comprising:
composing, via a processor 302, a signalling scheme comprising a sequence of digital pulses to drive the rotor 102 of the motor 101 in anticlockwise direction;
sending, via the processor 302, the signalling scheme comprising the sequence of digital pulses 501 to a driver of the motor;
converting, via the driver, the sequence of digital pulses into necessary power to energise the stator 103 further comprising motor winding;
converting, via the processor, the digital pulses into;
wherein the signalling scheme of digital pulses is characterised such that the sequence of digital pulses 501 are converted into corresponding rotor 102 shaft rotations in the form of torque to drive the motor in anticlockwise rotations by employing a single coil of the motor 100.

2. The method of claim 1, wherein the motor 100 is a single coil lavet type stepper motor.

3. The method of claim 1, wherein the processor 302 is capable of generating step pulses and the signalling scheme of digital pulses for the driver in order to set the anticlockwise rotation of the motor 100.

4. The method of claim 1, wherein the motor 100 is implemented in a wrist watch, wall clock or any other analogue clocks.

5. The method of claim 1, wherein the sequence of digital pulses comprises one or more digital pulses which sequentially energise the single coil windings 102 to generate specific anti-clockwise rotational movements.

6. The method of claim 1, wherein the anticlockwise rotation of the motor 100 corresponds to the increase or decrease in the amplitude of the digital pulses.

7. The method of claim 1, wherein the intervals between the sequences of digital pulses define the torque of the motor.

8. A system of operating a motor 100 by sending a signalling scheme, the system comprising:
a circuit (300/400) enabled to drive the motor 100 further comprising:
a processor 302 employed for composing a signalling scheme comprising a sequence of digital pulses to drive the rotor 102 of the motor 100 in an anticlockwise direction; and
a driver employed to receive the signalling scheme which further converts the sequence of digital pulses into necessary power to energise the motor winding 103;
a crystal oscillator 305 unit to set a required frequency of the digital pulses;
a wireless communication antenna unit 304 enabled to send and receive a plurality of data;
wherein the processor 302 is further capable of converting the signalling scheme comprising the sequence of digital pulses such that the sequence of digital pulses 501 are converted into desired anticlockwise rotations by employing a single coil 102 to drive the rotor 101.

9. A system of claim 1, wherein the motor 100 is a single coil lavet type stepper motor.

10. The system of claim 1, wherein the motor 100 is implemented in a wrist watch, wall clock or any other analogue clocks.

11. The system of claim 1, wherein the sequence of digital pulses comprises one or more pulses which sequentially energise the single coil windings 102 to generate specific anticlockwise rotational movements.
, Description:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION

(See Section 10 and Rule 13)

Title of disclosure:

A SYSTEM AND METHOD FOR DRIVING A SINGLE COIL LAVET STEPPER MOTOR IN ANTICLOCWISE DIRECTION

APPLICANT:
Salieabs Electronics Engineers LLP
An Indian entity having address as
180, Sundar Nagar, Mallamoopanpatti
Salem - 636302

The following specification particularly describes the disclosure and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
The present application does not claim priority from any other patent application(s).
TECHNICAL FIELD

This present disclosure relates to a system and method for driving a single coil lavet type stepper motor in an anti-clockwise direction, more particularly, the anti-clockwise rotation of the motor is enabled by a sequence of electrical signals which is supplied to the motor pins at calculated intervals.
BACKGROUND
There is a widespread usage of single coil lavet type stepping motor which are used in a variety of electro-mechanical clocks and wrist watches. Because of its requirement of very less power, it is implemented in wrist watches wherein the battery backup lasts for a plurality of years.
The single coil lavet type stepping motor has a limitation that it is only able to rotate in one direction which is clockwise rotation, which depends on the geometry of its stator. Such kind of limitation of rotation of motor shaft in only one direction has resulted a need for another coil in the stepping motor for rotating the hands in anti-clockwise direction. Such anticlockwise direction of hands in the watch are mostly required in smart watch which are equipped with altimeter, temperature sensor and the like chronographs. Such feature of anticlockwise movements of hands in wrist watch provides an expedited representation of a plurality of parameters.
The total cost of developing a smart watch with a feature of rotation of hands in clockwise and anticlockwise direction increases as there is a need for another coil assembly in the lavet type stepping motor resulting the motor and eventually the wrist watch or clock to be sold at exorbitant rates.
Such application of dedicated coils in the wrist watches employed for their respective rotation may further result in increase in production time, increase in the complexity of working structure of motor, increase in miscellaneous inventory further resulting in inefficient usage of available resources
Therefore, there is a long-felt need for an efficient system and method for driving a single coil lavet type stepper motor anticlockwise which may be implemented in smart watches or clocks.

SUMMARY
Before the present apparatus and its components and its method of use is described, it is to be understood that this disclosure is not limited to the particular apparatus and its arrangement as described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosure but may still be practicable within the scope of the disclosure as determined by claims. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present application. This summary is not intended to identify essential features of the claimed subject matter nor it is intended for use in detecting or limiting the scope of the claimed subject matter.
In an embodiment, a method of operating a motor by sending a signalling scheme is described. The method may comprise composing, via a processor, a signalling scheme comprising a sequence of digital pulses to drive the rotor of the motor in anticlockwise direction. The method may further comprise sending, via a processor, the signalling scheme comprising the sequence of digital pulses to a driver of the motor. The method may further comprise converting, via the driver, the sequences of digital pulses into necessary power to energise the motor winding. The method may further comprise converting, via the processor, the digital pulses into corresponding rotor shaft rotations to drive the motor in anticlockwise direction. The method may comprise wherein the signalling scheme of digital pulses is characterised such that the sequences of digital pulses are converted into anticlockwise rotations by employing a single coil of the motor.
In another embodiment, a system of operating a motor by sending a signalling scheme. The system may comprise a motor further comprising a processor employed for composing a signalling scheme comprising a sequence of digital pulses to drive the rotor of the motor in an anticlockwise direction. The motor may further comprise a driver employed to receive the signalling scheme which further converts the sequence of digital pulses into necessary power to energise the motor winding. The system may further comprise the processor wherein the processor may be capable of converting the signalling sequence of digital pulses such that the sequence of digital pulses are converted into desired anticlockwise rotations by employing a single coil to drive the rotor shaft rotations.

BRIEF DESCRIPTION OF DRAWINGS

The detailed description is described with reference to the accompanying Figures. In the Figures, the left-most digit(s) of a reference number identifies the Figure in which the reference number first appears. The same numbers are used throughout the drawings to refer like features and components.
Figure 1A illustrates a single coil lavet type stepper motor in a complete assembled form employed for anticlockwise rotation.
Figure 1B illustrates the single coil lavet type stepper motor further illustrating the functional components employed for stepping action.
Figure 2 illustrates a method of driving the single coil lavet type stepper motor in an anticlockwise direction.
Figure 3 illustrates a circuit diagram 400 for driving the single coil lavet type stepper motor 100 is described in accordance with an embodiment of the present disclosure.
Figure 4 illustrates a circuit diagram 400 for driving the single coil lavet type stepper motor 100 is described, in particularly when the voltage supplied is more than 1.5 volts, in accordance with an embodiment of the present disclosure.
Figure 5 illustrates an exemplary embodiment of a pulse diagram employed for anticlockwise rotation of motion.

DETAILED DESCRIPTION

This present disclosure relates to a system and method for driving a single coil lavet type stepper motor in an anticlockwise direction, more particularly, the anti-clockwise rotation of the motor is enabled by a sequence of electrical signals to be supplied to the motor pins at a calculated interval.
The system may comprise the single coil lavet type stepper motor wherein such stepper motor may be capable of rotating in an anti-clockwise direction. Such anticlockwise direction is enabled by the sequence of digital pulses with varying amplitude, frequency and intervals.
Referring Figure 1A and Figure 1B, wherein Figure 1A illustrates a single coil lavet type stepper motor 100 in a complete assembled form employed for anticlockwise rotation, in accordance with an embodiment of the present subject matter and Figure 1B illustrates in accordance with an embodiment of the present subject matter. The single coil lavet type stepper motor 100 may comprise a rotor 101, a stator 102 and coil arrangement 103. The coil arrangement 103 over the stator may enable the energisation and de-energisation of the stator 1012. The alternating magnetic flux created by the stator 102 may force the internal rotor 101 to move in anticlockwise direction. The inner rotor 101 may be a permanent magnet rotor. The stator coil 103 may receive the digital pulses from a driver which may be driven by a processor or microcontroller.
In a preferred embodiment, it is to be noted that the disclosure is described with a best mode of performing the desired anticlockwise rotation by implementing a 1.5-volt single coil lavet type stepper motor. Further it is to be noted that if the operating voltage of motor coil is lesser than the operating voltage of the microcontroller then a voltage divider driver may be implemented to drive the motor. Further, it is to be noted if the operating voltage of motor coil is lesser than the operating voltage of the microcontroller then a voltage divider driver may not be required.
Now referring to Figure 2, a method of driving the single coil lavet type stepper motor 100 in an anticlockwise direction is illustrated in accordance with an embodiment of the present subject matter. The method may comprise installing the circuit in a driving mechanism of the stepper motor.
At step 201, a required set of digital signals are generated by the processor such that the digital signals may further provide the desired anticlockwise movement of the stepper motor 100.
At step 202, the required set of signals are fed to the driver from the processor wherein the driver may be enabled to convert the digital pulses into electric signals which further may energise and de-energise the stator coil.
At step 203, the energisation and de-energisation of the coil may enable the stator coil to develop an electromagnetic flux which may force the magnetic rotor to move in anticlockwise direction.
At step 204, the rotor may develop alpha and beta rotation wherein the alpha rotation is executed when the stator coils are energised and the beta rotations are executed when the stator coils are de-energised.
In an embodiment, the single coil lavet type step motor may comprise two pins or wires which may be further operated by sending electrical signals. The signalling scheme may further comprise a sequence of digital pulses of 0 volts and 1.5 to 2.0 volts. The 0-volt signal may be referred as LOW and signals with >=1.4 volts may be referred as HIGH. The method may further comprise sending of HIGH and LOW electric signals at specific intervals on the wires or pins of the motor. The algorithm may be further described in the Table 1 mentioned below.
Line 1 of motor Line 2 of motor Rotation
Step 1 HIGH LOW
Interval Short Interval Short Interval
Step 2 LOW HIGH
Interval Long Interval Long Interval 1 step anti clockwise
Step 3 LOW HIGH
Interval Short Interval Short Interval
Step 4 HIGH LOW
Interval Long Interval Long Interval 1 step anti clockwise
Go to Step 1

Referring to Figure 3, a circuit diagram 300 for driving the single coil lavet type stepper motor 100 is described in accordance with an embodiment of the present disclosure. In an embodiment, the present circuit diagram is illustrated when the operating voltage of the motor is equal to operating voltage of microcontroller. The said circuit diagram may be powered by a battery 301 which may supply a current with a voltage of 1.5 volts. The circuit diagram may comprise a processor 302 which may be either of a controller, microcontroller, microprocessor or any other device or chipset capable of executing a set of pre-programmed instructions in a desired way. The battery may be coupled with one or more capacitors 303 wherein the capacitors 303 may be implemented to provide necessary electric charge when the battery 301 is not functioning properly or the power source is irregular. The circuit diagram 300 may further comprise an antenna unit 304 connected to the antenna port. The antenna unit 304 may be implemented for communicating with other one or more devices via wireless communication means for receiving or delivering data. The circuit diagram 300 may further comprise a crystal oscillator at XC1 and XC2 which may be employed for determining and specifying the operation of the single coil lavet type stepper motor 101 at a particular speed. In an exemplary embodiment, the crystal selected for the crystal oscillator 305 may be a 32.768 KHz crystal which may have a power value of 2 (215) value. Such crystal oscillator may be employed to get precise 1 second period by using 15 stage binary counter. The present application may also be operated with other crystal oscillators 32.768 KHz to 16 MHz. The circuit may further comprise the motor connected at points P0.11 and P0.12. The motor may be operated with a delivery current and voltage of 1.5 Volts with the sequences of pulses received from the microcontroller.
Referring to Figure 4, a circuit diagram 400 for driving the single coil lavet type stepper motor 100 is described, in particularly when the voltage supplied is more than operating voltage of the motor, in accordance with an embodiment of the present disclosure. The architecture and pin connections of such circuit diagram may be similar to the circuit diagrams described in Figure 3 except the circuit arrangement for the motor. In an exemplary embodiment, a plurality of motor circuits implemented in clocks or watches may be sustainable to a source voltage of 1.5 volts. But the power sources available may supply a voltage of 3 volts. Such high voltage of 3 volts may burn or damage the coils of the motor. In order to overcome such damage, one or more resistor circuits 401 are implemented in the motor circuit with resistor R1 and R3 connected in series with the pins P0.11 and P0.12 whereas resistors R2 and R4 may be in connection with motor inlet and outlet ports with a star connection of voltage source, motor point connections and the microcontroller points.
Referring to Figure 5, an exemplary embodiment of a pulse diagram employed for anticlockwise rotation of motion is illustrated in accordance with an embodiment of the present subject matter.
In an embodiment, the sequence of digital pulses 501 which may be supplied to the single coil lavet type stepper motor 100, in order to rotate it in anticlockwise direction by one step is illustrated. The sequence may comprise of six pulses P1, P2, P3, P4, P5 and P6 respectively. Increasing/Decreasing amplitude of the P1 and P3 within a limit may increase/decrease the torque of the motor. Increasing/Decreasing amplitude of the P5 within a limit may further increase/decrease the step angle which the motor may produce. The step angle may be defined by the gear design and the rotor design. By altering the amplitude of P6, the motor frequency can be altered.
During P1 to P4, the rotor may not be allowed to rest on a notch position. In an embodiment, the shorter pulses of high frequency may operate the permanent magnet rotor to vibrate and loose its equilibrium. The ensuing pulses P5 and P6 may pull the rotor in anticlockwise direction to resting notch position.
In an embodiment, the time span of P5 and P6 pulses may determine the torque of anticlockwise rotation. The pulse P5 may determine the driving torque and P6 may provide the settling time for the rotor to settle down and arrive at an equilibrium / rest state. The longer the duration of P5, the more is the torque. Such relationship may demand a longer resting time i.e. longer P6 duration. If the duration of P5 is more than what is necessary for one rotation, the rotor may cover more than one rotation. Hence depending on each motor's turning torque, the duration of P5 and hence P6 may be programmed into the microcontroller.
In an embodiment, the present subject matter may enable a single coil lavet type stepper motor to operate or rotate in anti-clockwise direction. The anti-clockwise rotation may be coupled with clockwise rotation in a conventional watch to make the watch a smart watch.
In a preferred embodiment, the anticlockwise rotation may enable the hands to reach at a point with minimal rotary displacement. For example, in an indication of any parameter (altitude, temperature and the like) which may have a marking at 11 o’ clock position, then the hand of the watch may travel in an anticlockwise direction with a minimal rotary motion and with an angular displacement of 30 degrees instead of 330 degrees when considered rotation clockwise direction.
In another preferred embodiment, the anticlockwise rotation may enable an analogue smart watch to represent dynamic data which have a fluctuating nature for example heart beat pulses, speed measuring with the aids of GPS and the like data. For example, a heartbeat pulse with a fluctuating range ranging from 60 to 100 beats per minute may call for an analogue hand to rotate in both anticlockwise direction as well as clockwise direction. The rotation may enable to indicate the sequence of 70, 65, 69, 67, 75 in an analogue dial.
The embodiments, examples and alternatives of the preceding paragraphs, the claims, or the following description and drawings, including any of their various aspects or respective individual features, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible. The present disclosure can be embodied in many other forms or carried out in other ways, without departing from the spirit or essential characteristics thereof, and the above-mentioned embodiment of the disclosure have been disclosed in detail only for illustrative purposes. It is understood that the disclosure is not limited thereto, but is susceptible of numerous changes and modifications as known to those skilled in the art, and all such variations or modifications of the disclosed apparatus, including the rearrangement of parts, lie within the scope of the present disclosure.