Low-speed control algorithm of switched reluctance motor

Abstract

The invention discloses a low-speed control algorithm of a switched reluctance motor. The low-speed control algorithm is characterized by realizing the segmentation control on the low-rotating-speed areas of the switched reluctance motor and comprising specific steps: in the stage of initial starting and extremely low speed smaller than 200RPM (Revolutions Per Minute) of the switched reluctance motor, the open loop stepping control is adopted, so that the switched reluctance motor can obtain starting and low-speed torque so as to successfully start and maintain low-speed running; in the stage of motor low speed higher than 200RPM and lower than minimum continuous pulse width rotating speed, the closed loop control of six-beat conduction of single-double-beat alternative conduction is adopted; when the load is high, the fixed PWM (Pulse-Width Modulation) frequency control is automatically adopted; and when the load is low, the switching-on time of the power converter switching device is fixed, the switching-off time is dynamically changed, so as to realize that the speed control of the switched reluctance motor can be stable in low-speed stage. The switched reluctance motor is small in low-speed running noise, high in the efficiency of a controller, large in load adaption capability, lower in required cost, and high in cost performance.

Description

technical field [0001] The invention belongs to the field of switched reluctance motors, in particular to a low-speed control algorithm of switched reluctance motors. Background technique [0002] Switched reluctance motor is a new type of speed regulation motor. The speed regulation system has the advantages of both DC and AC speed regulation systems. It has a simple and sturdy structure, wide speed regulation range, excellent speed regulation performance, high efficiency in the entire speed regulation range, and high system reliability. [0003] The switched reluctance motor has a simple structure, superior performance and high reliability, covering various high and low speed drive speed control systems with a power range of 10W to 5MW. Switched reluctance motors have many potential fields and can be widely used in various occasions requiring speed regulation and high efficiency (electric vehicle drives, general industry, household appliances, textile machinery, electric ...

AI Technical Summary

Problems solved by technology

[0005] 1. The DC bus voltage of the power supply is not easy to reduce, and the minimum turn-on (or turn-off) time of the switching device cannot be too small, and the fixed-frequency PWM modulation method cannot obtain low speed;

[0006] 2. The electromagnetic noise of the motor operation should not be in the audio frequency area, and it should not cause electromagnetic interference to the peripheral equipment due to the drastic change of the motor phase current, so the PWM frequency should not be kept too low.

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