Permanent magnet motor with sinusoidal back-EMF waveform and related motor controller for position sensorless drives

摘要

A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator.

主权项

1. A system comprising:
an inverter configured to generate a current; a permanent magnet motor coupled with the inverter, the permanent magnet motor configured to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal in response to receiving the current from the inverter; and a motor controller including:
a sliding-mode observer circuitry having:
a combiner coupled with the permanent magnet motor, and configured to determine a current error based on an estimated current and the current received by the permanent magnet motor; anda sliding-mode controller coupled with the combiner, and configured to estimate the back-EMF waveform based on the current error; anda position observer circuitry configured to estimate a characteristic of the permanent magnet motor using the estimated back-EMF waveform, and the position observer circuitry including:
a first integrator coupled with the sliding-mode observer, and configured to generate an integral output based on an integral controller gain and a continuous EMF vector; anda second integrator coupled with the first integrator, and configured to generate an estimated position by integrating the integral output.