Electric Motor with Adjustable Timing
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Accused Products
Abstract
An electrically commutated motor includes a first module to measure a current in a coil of the motor, and a second module to adjust timing of commutation of the motor based on the current measurement.
31 Citations
26 Claims
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1. (canceled)
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2. A single coil, single phase, direct current permanent magnet brushless motor, comprising:
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a rotor with a plurality of permanent magnets;
a stator with a plurality of salient poles;
a sensor to sense a position of the rotor relative to the stator;
a commutation module to commutate the motor;
a current sample module programmed to sample a current through the single coil of the motor at least two times during a single commutation cycle; and
a waveform shape module programmed to compare sampled currents to estimate a current waveform characteristic through the single coil;
wherein the commutation module is programmed to adjust timing of a commutation of the motor based upon the current waveform characteristic to adjust advance or delay the commutation. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of a commutation of a single coil, single phase, direct current permanent magnet brushless motor, the method comprising:
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commutating the motor;
sampling a current through the single coil of the motor at least two times during a single commutation cycle;
comparing sampled currents to estimate a current waveform characteristic through the single coil; and
adjusting timing of the commutation of the motor based upon the current waveform characteristic to advance or delay the commutation. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A sensorless single coil, single phase, direct current permanent magnet brushless motor, the motor comprising:
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a virtual RPM sensor programmed to estimate an RPM of the motor; and
a virtual encoder programmed to estimate a position of a rotor of the motor;
wherein timing for commutation of the motor is based on output from one of the virtual RPM sensor and the virtual encoder. - View Dependent Claims (24, 25, 26)
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Specification