Switched reluctance motor sensorless control method

Abstract

The invention belongs to the field of motor control, and particularly relates to a switched reluctance motor sensorless control method. The method comprises: establishing a simplified incremental inductance model based on the simplified Fourier series expression of switched reluctance motor inductance and the relational expression of incremental inductance and inductance; measuring the incrementalinductances of three special rotor positions of a switched reluctance motor under different phase currents so as to obtain a relation that an incremental inductance model coefficient changes along with the phase currents, and establishing the nonlinear incremental inductance model of the switched reluctance motor; deducing an analytic expression for estimating the rotor position of the switched reluctance motor according to the phase increment inductance and the coefficient thereof according to the increment inductance model; and when the motor operates, detecting phase current and bus voltage, estimating excitation phase increment inductance by adopting a current slope difference method, calculating the current rotor position by utilizing the derived rotor position analytical formula, and achieving the sensorless operation control of the switched reluctance motor according to the estimated rotor position. The control method is simple, small in calculation amount, easy to realize digitalization and high in position estimation precision.

Description

technical field [0001] The invention relates to a method for controlling a switched reluctance motor, in particular to a method for controlling a switched reluctance motor without a position sensor based on an incremental inductance model. Background technique [0002] Switched reluctance motor is a new type of electromechanical integration motor, which has the advantages of simple and firm structure, reliable operation, good speed regulation performance, low manufacturing cost, suitable for high speed and harsh environment operation, etc. These excellent characteristics make it an electrical One of the research topics in the field of transmission, it has been applied in the fields of motor drive systems, fans, water pumps, aerospace and other fields, showing its strong market competitiveness. [0003] Real-time and accurate acquisition of rotor position information is an important condition for reliable operation of switched reluctance motors, especially high-performance op...

AI Technical Summary

Problems solved by technology

[0003] Real-time and accurate acquisition of rotor position information is an important condition for reliable operation of switched reluctance motors, especially high-performance operation. However, in current practical engineering applications, Hall position sensors and resolvers are generally used to detect rotor positions. This increases the system cost and reduces the reliability of the system, especially the reliability of position detection in extreme environments such as high temperature and strong electromagnetic field

In addition, the debugging and initial positioning of the position sensor before normal use will also bring a certain amount of work

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