Position sensorless PMSM (permanent magnet synchronous motor) control system

Abstract

The invention discloses a position sensorless PMSM (permanent magnet synchronous motor) control system in the field of motor control. A high-frequency signal generator generates a high-frequency pulsevibration voltage Umhcos (omega ht) signal, wherein the high-frequency pulse vibration voltage Umhcos (omega ht) is injected into the d-axis of an observation shaft system, umh is an amplitude value,and omegah is the electric angle frequency; a current component is inputted to a synchronous frequency detector; the output end of the synchronous frequency detector is sequentially connected with amultiplier, an arithmetic unit and a Runeberg observer in series; the synchronous frequency detector outputs a high-frequency response current, and the high-frequency response current and a sine signal 2sin (omega ht) are used as two inputs of the multiplier; the multiplier outputs a high-frequency current, and the high-frequency current and a cosine signal cos (2 omega ht) are inputted into the arithmetic unit; a current f(delta(theta)) containing an angle error signal is obtained through calculation, and is inputted into the Runeberg observer; the Runeberg observer outputs a rotor observation position angle and a rotating speed. According to the invention, a low-pass filter is not needed in the process of extracting the signals containing the rotor position errors, the signal delay and amplitude attenuation are avoided, and the dynamic response capability of the system can be effectively improved.

Description

Technical field [0001] The invention belongs to the field of motor control, and specifically relates to an estimation system for controlling the rotor position and speed of a permanent magnet synchronous motor without a position sensor, and is particularly suitable for application occasions of low-speed sensorless control of a permanent magnet synchronous motor. Background technique [0002] As one of the key executive components of hybrid electric vehicles and electric vehicles, vehicle drive motors have a direct impact on the performance of hybrid vehicles and electric vehicles. At present, the drive motor for vehicles mainly adopts a permanent magnet synchronous motor, which has the advantages of high power density, high efficiency, and low operating noise. In order to achieve high-performance control of permanent magnet synchronous motors, the detection of motor rotor position and speed information is essential. In the motor control system, the use of traditional physical sp...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the sensorless control of permanent magnet synchronous motors suitable for low speed. In the signal processing process, it is necessary to use a band-pass filter to extract the high-frequency response current and to extract the rotor position error through a low-pass filter. signal, calculate the rotor position and speed through the observer, and affect the dynamic performance of the system. A sensorless permanent magnet synchronous motor control system is proposed. The synchronous frequency detector is used to extract high-frequency signals, and the rotor position error is obtained by algebraic operation. signal, and then calculate the rotor position and speed through the observer, which reduces the use of filters, simplifies the signal processing process, and improves the dynamic response capability

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