Improved switch reluctance motor current sampling method

Abstract

The invention discloses an improved switch reluctance motor current sampling method. The method can overcome the one-beat time delay problem of a traditional current sampling method, can improve the accuracy of the SRM feedback current, and can improve the SRM current tracking performance to improve the accuracy of control implementation, and then the SRM torque pulsation is reduced. The method has the beneficial effects that (1) the provided improved switch reluctance motor current sampling method can effectively suppress the one-beat control delay problem of the traditional current samplingat the motor base speed and in the following range; (2) the provided improved switch reluctance motor current sampling method can obviously improve the motor actual current tracking reference currentcapacity at the motor base speed and in the following range; and (3) under the same requirement on the motor actual current tracking reference current performance, the provided improved switch reluctance motor current sampling method can greatly reduce the switching frequency, reduce the switch tube loss, and prolongs the service life of the switch tube at the motor base speed and in the followingrange.

Description

technical field [0001] The invention belongs to a switched reluctance motor current sampling technology in the field of electrical engineering, and in particular relates to an improved switched reluctance motor current sampling method. technical background [0002] The switched reluctance motor (SRM) has simple and firm structure, reliable operation and high efficiency. Compared with the traditional AC and DC speed control system, the switched reluctance motor drive system composed of it has many advantages, such as: starting torque Large, wide speed range, flexible control, can easily realize four-quadrant operation, has strong regenerative braking ability, has high efficiency in a wide range of speed and power, and is conducive to energy saving and consumption reduction; it can work at extremely high Rotational speed; it can run without phase, and has strong fault tolerance. At present, various switched reluctance motor technologies, including switched reluctance motor co...

AI Technical Summary

Problems solved by technology

[0004] However, in the application of high-power SRM electric drive system, digital control is mainly used. By using DSP as the controller, the maximum switching frequency of the switching device is limited by comprehensive factors such as the power and reliability of the electric drive system of the switching device itself. , so the SRM electric drive system also faces a challenge, that is, to improve the overall output performance of the motor through precise control under the limited switching frequency

The very important prerequisite for realizing precise motor control is accurate feedback current, and the feedback current error is mainly caused by the sampling delay. In general SRM electric drive system control, the current sampling has a one-beat delay.

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