System and method for phase sequence detection and rotor initial location positioning of three-phase permanent-magnet synchronous motor

Abstract

The invention discloses a system and a method for phase sequence detection and rotor initial location positioning of a three-phase permanent-magnet synchronous motor. The system comprises a permanent-magnet synchronous motor, a controller, an inverter and a position sensor, wherein the connecting phase sequence of the inverter corresponding to the permanent-magnet synchronous motor is abc or acb, the controller controls the rotor to rotate on the basis of the voltage vector control technology and gives voltage vectors of two fixed phase positions of a stator sequentially so as to drive the rotor to rotate to the corresponding positions sequentially, and the position sensor is used for acquiring two absolute position angles to which the rotor rotates, the controller is used for calculating the difference of the two absolute position angles to judge the connecting phase sequence of the permanent-magnet synchronous motor, the initial location angle of the rotor is set by the given pressure vector, the initial location angle and the motor phase sequence information are stored in an eeprom (Electrically Erasable Programmable Read-Only Memory), and the controller acquires the initial location angle and the motor phase sequence from the eeprom or by calling the detected initial angle and the phase sequence subfunction each time the controller is electrified. The system is simple and the detection method is simple, reliable and accurate.

Description

technical field [0001] The invention relates to a system and method for phase sequence detection and rotor initial position positioning of a three-phase permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor has the characteristics of simple structure, small size, high power density, efficiency and power factor, and strong adaptability to the working environment. It is increasingly widely used in modern industries, such as CNC machine tools and servo systems; permanent magnet synchronous motors Initial position angle detection technology and motor phase sequence detection technology are very important in motor control. At present, the initial position angle detection methods of permanent magnet synchronous motors mainly include the measurement of B and C opposite electromotive force, high-frequency injection method, etc., but the engineering implementation of these methods is troublesome, and the position detection is not acc...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a phase sequence detection and rotor initial position positioning system and method of a three-phase permanent magnet synchronous motor, which overcomes the shortcomings of troublesome implementation and inaccurate detection in the background technology

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