Low-speed and zero-speed rotor position observation method and device during fault-tolerant operation of synchronous motor

Abstract

The invention relates to a low-speed and zero-speed rotor position observation method and a low-speed and zero-speed rotor position observation device during fault-tolerant operation of a synchronous motor. The low-speed and zero-speed rotor position observation method during fault-tolerant operation of the synchronous motor is characterized in that: high frequency sine pulse voltage with fixed frequency is applied at a two-phase working winding end at partial time intervals, and the working winding generates corresponding high frequency current; and the high frequency current is synchronously acquired by a band-pass filter, a rotor position angle observation error function is calculated through links such as a multiplier, a low pass filter, an adder, a coordinate rotation transformation and the like, a value of the error function is sent to a proportional-integral (PI) regulator, and an observation value of the rotor position angle is output by the PI regulator. The invention is favorable for accurately observing the rotor position during the fault-tolerant operation of a three-phase salient pole synchronous motor under the condition that one phase of stator winding is open-circuit.

Description

technical field [0001] The invention relates to a drive control of a synchronous motor, in particular to a method and a device for detecting the rotor position of the synchronous motor. Background technique [0002] Synchronous motors are divided into electrically excited synchronous motors and permanent magnet synchronous motors. By adjusting the excitation current of the rotor of the electrically excited synchronous motor, the unit power factor operation of the stator side of the motor can be realized, and the high-efficiency operation of the motor can be realized. The rotor of the permanent magnet synchronous motor is excited by permanent magnets, which does not require a separate excitation winding. The motor has a compact structure and can operate with high power factor and high efficiency. In view of the high efficiency advantages of the above two motors, synchronous motors have been widely used in both ground industry and aerospace. For example, a large number of sy...

AI Technical Summary

Problems solved by technology

Scholars have conducted detailed research on the fault-tolerant topology and control principles of synchronous motors, and conducted extensive and in-depth research on the sensorless control technology of synchronous motors during normal operation. The technology of low-speed and zero-speed rotor position observation using high-frequency signal injection during open-circuit fault-tolerant operation of one-phase winding has not yet been studied.

Images