Switched reluctance motor direct instantaneous current control method and controller

Abstract

The invention relates to a direct instantaneous current control method and a controller for a switched reluctance motor, and the method comprises the following steps: obtaining a current given value outputted by a speed closed-loop controller unit, and obtaining different rotor positions and speeds during the operation of the motor to determine a current reference value of each phase of the motor; compensating for a total current given value and a current given value of each phase in real time according to an actual current torque model of a motor through a current distribution method adopting cosine transform in a motor commutation interval and a current chopping control method adopting a fuzzy logic rule in a single-phase conduction interval, so as to reduce the influence of nonlinearity of motor parameters on a system through a fuzzy logic control rule; combining the traditional current chopping control and pulse width modulation through the fuzzy logic control rule, so the defects that the switching frequency of a current chopping controller is not fixed and the requirement for the switching frequency of a device is high are overcome, and then suppression of motor output torque pulsation is achieved. The method has the advantages of being simple, convenient to use and high in system dynamic response speed.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a direct instantaneous current control method and a controller of a switched reluctance motor. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Switched reluctance motors often use current chopping control or current hysteresis control during start-up and low-speed operation. When the preset current error width is small, the traditional current chopping control method has higher requirements on the switching frequency of power electronic devices. If the switching frequency of the current chopping power electronic device is set low, the error between the actual current and the reference current will be large, which will cause the actual current to fluctuate greatly around the reference current, making it difficult to achieve the ideal control accura...

AI Technical Summary

Problems solved by technology

If the switching frequency of the current chopping power electronic device is set low, the error between the actual current and the reference current will be large, which will cause the actual current to fluctuate greatly around the reference current, making it difficult to achieve ideal control accuracy.

[0004] The traditional current reference value is generally obtained by means of speed loop proportional integral or torque current distribution function. The torque current inverse model needs to be obtained by finite element simulation. At the same time, due to the nonlinearity of the motor parameters, the current reference value It is difficult to achieve precise control, especially in the range of motor commutation when the system is at low speed, it is more difficult to achieve precise control

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