Method for detecting initial position and rotating speed of rotor of permanent magnet synchronous motor at high rotating speed

Abstract

A rotor initial position and rotating speed detection method for a permanent magnet synchronous motor at a high rotating speed belongs to the technical field of motor control. The problem that a traditional zero-voltage vector pulse method depends on motor parameters in detection of the initial position and the rotating speed of a rotor is solved. Comprising the following steps: applying a first zero voltage vector pulse to a permanent magnet synchronous motor mathematical model, and calculating to obtain a rotor actual position angle at a first pulse zero point; applying a second zero voltage vector pulse at a second selected time point to obtain an actual position angle of the rotor at the zero point of the second pulse; further calculating to obtain a first-stage rotor rotating speed; similarly, the actual position angle of the rotor at the third pulse zero point is obtained; on this basis, the second-stage rotor speed is obtained; determining a rotor rotating speed at a selected switching time point according to the rotor rotating speeds in the first two stages; and the actual position angle of the rotor at the selected switching time point is determined according to the actual position angles of the rotor at the second pulse zero point and the third pulse zero point. The initial position and the rotating speed of the rotor can be obtained by separating motor parameters.

Description

technical field [0001] The invention relates to a method for detecting the initial position and rotational speed of a rotor of a permanent magnet synchronous motor at high rotational speed, and belongs to the technical field of motor control. Background technique [0002] With the continuous advancement of mechanization and electrification, motors play an increasingly important role in electromechanical energy conversion. Due to the advantages of simple structure, high power density, high efficiency, and good dynamic and static performance, permanent magnet synchronous motor has an ideal development prospect in the field of electrical transmission, especially in the field of medium and small power applications. [0003] The high-performance permanent magnet synchronous motor vector control system relies on high-precision rotor position detection to ensure the accuracy of coordinate transformation. The sensorless control technology can realize high-precision rotor position a...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the traditional zero-voltage vector pulse method relies on motor parameters in the detection of the initial position and rotational speed of the rotor, the present invention provides a method for detecting the initial position and rotational speed of the rotor at high rotational speeds of permanent magnet synchronous motors

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