Position-sensorless control method suitable for running of switched reluctance motor in whole-speed range

Abstract

The invention discloses a position-sensorless control method suitable for running of a switched reluctance motor in a whole-speed range, and belongs to control methods of switched reluctance motors. A function relationship among a rotor angle, an inductance coefficient and three phases of inductances is set up based on a complex plane induction model of the switched reluctance motor; when the switched reluctance motor is static or is started under the initial rotating speed condition, a pulse injection method is adopted to obtain the three phases of inductances; when the switched reluctance motor runs at the low speed, a free phase pulse injection method is adopted to set up a function relationship of the sum of the three phases of inductances, and therefore conduction phase inductances are obtained; when the switched reluctance motor runs at the high speed, current is divided by an integral magnetic chain, so that reference phase inductances are obtained; a rotor position obtained through derivation is utilized for estimating an analytic expression and calculating the current position of a rotor, and according to the estimated rotor position, the position-sensorless run control over the switched reluctance motor can be achieved. The method is simple and small in calculated amount, a controller can easily run in the whole-speed range, and the higher position estimation precision is achieved.

Description

technical field

[0001] The invention relates to a control method of a switched reluctance motor, in particular to a position sensorless control method suitable for the full-speed operation of the switched reluctance motor. Background technique

[0002] Switched reluctance motor (SRM) has the advantages of simple and firm structure, convenient and flexible control, and wide speed and power range. It is widely used in various fields such as traction transportation, general industry, aviation, and household appliances. One of the hot topics. The position detection link is an important part of the switched reluctance motor drive system. The detected position signal is not only the basis for turning on and off the winding, but also provides speed information for the closed-loop control of the speed. In current practical applications, shaft position sensors or other types of detection position detectors are generally used to obtain rotor position information. The introduction of ...

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