A Rotor Position Estimation Method for Switched Reluctance Motor

Abstract

The invention relates to a method for estimating the rotor position of a switched reluctance motor. Using the inductance characteristics of the main magnetic circuit when the main magnetic circuit is saturated, a rotor position estimation strategy that avoids the saturated nonlinear inductance interval of the detection coil is proposed, and at the same time, the indirect inductance information of the detection coil is considered. In the acquisition process, due to the phase shift problem caused by analog filtering, the corresponding phase shift compensation algorithm is designed according to the phase shift theory to eliminate the position estimation error and further improve the accuracy of position estimation. Through the above design, the detection coil technology can meet the dynamic operation requirements under various load conditions, and can also realize accurate static initial position positioning, and realize frequent non-reverse starting of the motor. This will help its practical application in aerospace starter generators, electric vehicle drive motors and other applications that require extremely high reliability and relatively harsh operating conditions.

Description

technical field [0001] The invention relates to a method for estimating the rotor position of a switched reluctance motor, belonging to the technical field of motor detection. Background technique [0002] The switched reluctance motor has the characteristics of simple and sturdy structure, suitable for high-speed, high-temperature operation, and strong fault tolerance. Rotor position detection or estimation is one of the most critical links in the switched reluctance motor system. Traditional rotor position sensors are susceptible to high temperature, high speed, dust and other working conditions or environmental factors, and their reliability and tolerance to harsh environments are relatively low. To solve the problems of sensors, no position sensor technology and indirect position detection technology are extremely important. The position sensorless technology needs to use the motor inductance or flux linkage characteristics. The positionless algorithm and the motor con...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for estimating the rotor position of a switched reluctance motor, which solves the problem of the influence of the strong nonlinearity of the detection coil inductance on the position estimation caused by the saturation of the main magnetic circuit, and at the same time solves the indirect acquisition of the detection coil inductance information During the process, the phase shift caused by analog filtering affects the accuracy of position estimation

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