Output torque depulsation control method for switch reluctance servo motor

Abstract

This invention relates to a method for controlling the output torque pulse-extinction of a switch reluctance servomotor used in different phase numbers and structures. When starting the motor, it begins to supply the motor stator phase winding at the smallest phase inductance position and stops supplying it at the maximum position and fixes the chopper limit of the phase current, when operating, it begins to supply it at the smallest phase inductance position and stops supplying before hand at the maximum phase inductance position to regulate the chopper-limit of the phase current, when reducing the operation, it begins supplying the winding at the maximum position and stops it before hand at the minimum position to fix the chopper limit of the phase current.

Description

1. Technical field [0001] The invention relates to a control method for output torque ripple elimination of a switched reluctance servo motor, and is especially suitable for switched reluctance servo motors with various phase numbers and structures. 2. Background technology [0002] Since the switched reluctance motor adopts a simple and strong rotor structure with no brush, no winding, and no permanent magnet, and the unipolar power converter supplies unidirectional current excitation, the phases on the magnetic circuit can be independent of each other and the phases on the circuit can be independent of each other. Independent of each other, the system has high operational reliability and fault tolerance. Its natural mechanical characteristics are similar to series-excited DC motors, and its low-speed torque is large. The switched reluctance motor has many controllable parameters, and it is easy to realize the conversion of electric and braking operation in the control, an...

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Problems solved by technology

The second is to reduce the output torque ripple by optimizing the phase current waveform of the motor, mainly including: (a) Obtain the expected current waveform by querying the phase current / rotor position curve data under different torques obtained from the actual measurement, and reduce the torque ripple, but It cannot meet the requirement of infinite current switching rate during commutation; (b) use the torque sharing coefficient to obtain the torque of each phase, and obtain the expected current waveform from the motor torque angle characteristics to reduce torque ripple, but the torque sharing function is accurately established Difficult; (c) gradually establish the switched reluctance motor model through "self-learning", determine the expected current waveform online, and reduce the torque ripple, but it is difficult to obtain a more accurate motor model with less calculation, and the inaccuracy of the model will affect (d) By injecting current into the phase winding, a torque pulse is generated to offset the original torque ripple of the conventional power supply, but it is difficult to realize

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