A Position Sensorless Control Method for Switched Reluctance Motor with Double Sampling Points

Abstract

The invention provides a dual-sampling-point control method for a switched reluctance motor without a position sensor. The dual-sampling-point control method belongs to the field of switched reluctance motor control technologies, and comprises the steps of: step 1001, starting operation of the switched reluctance motor; step 1002, injecting a voltage pulse; step 1003, sampling and calculating a position characteristic value; step 1004, judging whether a threshold value requirement is met; step 1005, performing motor commutation, generating internal interruption and recording interruption time;step 1006, calculating a motor rotation speed; step 1007, judging whether the rotation speed changes; step 1008, and calculating a pulse width Tw of the injected voltage pulse. According to the dual-sampling-point control method for the switched reluctance motor without the position sensor, a specific value of a winding current difference value obtained by means of the dual sampling points to injection time serves as a position characteristic value of the motor, thus current sampling errors caused by variations of cold and hot state resistance of the motor windings, signal conditioning circuit drift and the like can be voided, and the position recognition precision of the motor is improved.

Description

technical field [0001] The invention relates to a position sensorless control method of a switched reluctance motor with double sampling points, which belongs to the technical field of switched reluctance motor control. Background technique [0002] Switched Reluctance Drive system (SRD for short) is a new type of AC speed control system developed in the mid-1980s. It incorporates a new motor structure - Switched Reluctance Motor (SRM for short) ) is integrated with modern power electronics technology and control technology, and has the advantages of asynchronous motor frequency conversion speed regulation system and DC motor speed regulation system. It has become one of the research hotspots of electric transmission now. Also getting bigger and bigger. [0003] Switched reluctance motor is a kind of double salient pole motor. Its working principle is to energize the phase windings in turn according to the relative position of stator and rotor of motor. Therefore, the relat...

AI Technical Summary

Problems solved by technology

In practical applications, due to changes in the resistance value of the motor windings in the cold state or hot state or the drift of the signal conditioning module, etc., the current amplitude of the windings will change, resulting in incorrect identification of the motor position and inaccurate commutation points.

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