A switch reluctance motor hybrid speed control method with wide speed range

Abstract

A switch reluctance motor hybrid speed control method with wide speed range the speed control system is mainly composed of a speed regulator, a current chopper controller, a Voltage PWM Controller, anangle position controller, first and second comparison selector, The periodic duty cycle calculation section and three constant registers are composed of. According to the motor speed, the first comparison selector switches between the current chopper controller and the voltage PWM controller, and calculates the duty cycle of the current chopper signal in one electrical cycle as the initial dutycycle of the voltage PWM controller at the switching time by the cycle duty cycle calculation link; Depending on the duty cycle of the voltage PWM controller, the comparison selector switches the voltage PWM controller and the angle position controller, performing automatic switching between different control modes and the smooth speed regulation in the full speed range by the two switching modeswhen the motor is run at acceleration, deceleration and uniform speed, which is not affected by the change of the motor operating conditions, and improves the stability of the system operation, and has good engineering application value.

Description

technical field [0001] The invention relates to a speed regulation control method of a switched reluctance motor, especially suitable for speed control within a wide speed range of switched reluctance motors with various structures and phase numbers. Background technique [0002] The switched reluctance motor has a simple and solid structure, low manufacturing cost, large starting torque and small starting current, high system efficiency, strong fault tolerance, and wide speed range. Compared with other motors, it is especially suitable for high speed, high temperature, strong vibration, etc. In harsh environments, the control method of switched reluctance motor is simple and flexible. By adjusting the current chopping limit, PWM duty cycle, turn-on angle and turn-off angle, various speed control methods can be realized in a wide speed range, but different speed control methods The applicable speed ranges are different. Generally, the low speed range adopts current chopping ...

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Problems solved by technology

[0002] The switched reluctance motor has a simple and solid structure, low manufacturing cost, large starting torque and small starting current, high system efficiency, strong fault tolerance, and wide speed range. Compared with other motors, it is especially suitable for high speed, high temperature, strong vibration, etc. In harsh environments, the control method of switched reluctance motor is simple and flexible. By adjusting the current chopping limit, PWM duty cycle, turn-on angle and turn-off angle, various speed control methods can be realized in a wide speed range, but different speed control methods The applicable speed ranges are different. Generally, the low speed range adopts current chopping control, the medium speed range adopts voltage PWM control, and the high speed range adopts angle position control. Since the control quantities of the three control methods are different, and the working conditions of the motor are complex and changeable, only As the switching sign of the three control methods, the speed is likely to cause fluctuations in the speed or torque of the motor and reduce the stability of the system. In order to improve the speed regulation performance of the switched reluctance motor, it is necessary to study a method that can realize current chopper control, Speed ​​regulation control method with seamless switching between voltage PWM control and angle position control within the full speed range

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