Error-free SRM (switched reluctance motor) current control method

Abstract

The invention provides an error-free SRM (switched reluctance motor) current control method. The method comprises the following steps: performing calculation to obtain a current change slope of a nextcarrier cycle in any electric cycle according to the recorded parameters during motor operation; accurately obtaining a driving state of the next carrier cycle in any electric cycle according to a difference value of an actual current and a reference current, and accurately calculating the duty ratio needed by the next carrier cycle in any electric cycle. According to the method, in a high-powerelectric drive system, the current error-free tracking is realized under the condition of the limited switching frequency, and the current tracking performance is improved, so that the torque ripple output by an SRM is reduced, and the output performance of the motor is improved.

Description

technical field [0001] The invention belongs to the switched reluctance motor control technology in the field of electrical engineering, and in particular relates to an error-free switched reluctance motor current control method. [0002] technical background [0003] Switched Reluctance Motor (SRM) is a new type of motor that has developed rapidly in the past ten years. It has large starting torque, wide speed range, flexible control, and can easily realize four-quadrant operation. It has strong regenerative Braking ability, with high efficiency in a wide range of speed and power, which is conducive to energy saving and consumption reduction; it can work at extremely high speeds; it can run with phase loss, and has strong fault tolerance. It has been widely used in aerospace, electric vehicles, oil field mining and household appliances and other fields. [0004] However, compared with traditional motors, SRM's doubly salient pole structure and switching power supply charact...

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Problems solved by technology

[0011] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an error-free switched reluctance motor current control method. When the control frequency is relatively low, the method comprehensively considers the advantages and disadvantages of current chopping control, and ensures that the switching Under the condition of reliable operation of the reluctance motor, the actual current of the motor can be adjusted and controlled accurately and effectively at low speed, medium speed and high speed, which overcomes the hysteresis control is a kind of fault-tolerant control, and there is an inevitable tracking error problem; solve The software current control method needs a certain amount of time to run, the disadvantages of large current fluctuations caused by long control cycles, and poor performance in tracking the current given value; at the same time, it weakens the potential current fluctuation problem caused by the delay of a sampling cycle in hysteresis control , Accurately control the motor current to track the reference current Improve the performance of the current actual value tracking the current reference value, thereby reducing the torque ripple of the switched reluctance motor

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