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Sensorless control method for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in motor control, motor generator control, AC motor control and other directions, can solve the problem of permanent magnet synchronous motor, etc., and achieves the advantages of improving performance, simple implementation, and avoiding high-frequency noise. Effect

Pending Publication Date: 2020-11-24
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sensorless control method for permanent magnet synchronous motors, through which the operation problems of surface-mounted permanent magnet synchronous motors at low speed and zero speed are solved

Method used

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  • Sensorless control method for permanent magnet synchronous motor
  • Sensorless control method for permanent magnet synchronous motor
  • Sensorless control method for permanent magnet synchronous motor

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Experimental program
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Embodiment 1

[0062] A sensorless control method for a permanent magnet synchronous motor, the algorithm comprising the steps of:

[0063] Step 1. Establish a surface-mounted permanent magnet synchronous motor mathematical model, that is, a permanent magnet synchronous motor based on a static coordinate system (α-β coordinate system) motor model;

[0064] (1)

[0065] (2)

[0066] Among them, ψ=[ψ α , ψ β ] T is the stator flux linkage in the stationary coordinate system, ψ m is the flux linkage constant of the permanent magnet, L S is the stator winding inductance, i ab =[i α , i β ]T and is the stator current in the stationary coordinate system, u ab =[u α ,u β ] T is the stator voltage in the stationary coordinate system, R is the winding resistance of the stator coil, and θ is the rotor position;

[0067] Step 2, in order to obtain the rotor position information, derive the mathematical model of the rotor flux linkage;

[0068] Combining the above two formulas, the f...

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Abstract

The invention relates to a sensorless control method for a permanent magnet synchronous motor. In the sensorless condition of the permanent magnet synchronous motor, two major methods are mainly provided for obtaining rotor information, one method is a method for constructing a state observer, and rotor position information is obtained from a back electromotive force signal. Due to the fact that back electromotive force signals are weak when the motor operates at a low speed, the method is poor in performance of estimating the rotor position at a low speed, the permanent magnet synchronous motor does not generate back electromotive force at a zero speed and cannot estimate the rotor position, but has excellent performance in a medium-high speed range. The method comprises the following steps: establishing a permanent magnet synchronous motor model, constructing a rotor flux linkage observer to observe rotor position information, carrying out initial value estimation and compensation onthe rotor flux linkage observer, constructing a rotating speed observer, converting the rotor position information into rotating speed information, and constructing an id controller to complete errorcompensation. The sensorless control method is used for the permanent magnet synchronous motor.

Description

Technical field: [0001] The invention relates to the field of motor control, in particular to a sensorless control method for a permanent magnet synchronous motor. Background technique: [0002] Permanent magnet synchronous motor is a kind of synchronous motor that generates synchronous rotating magnetic field by permanent magnet excitation. Compared with asynchronous motor, permanent magnet synchronous motor has high power density, small moment of inertia, high energy conversion efficiency and low maintenance cost, and is widely used in new Energy vehicles, aerospace, CNC machine tools and other fields. Traditional PMSM control systems usually use mechanical position sensors to obtain rotor position information and instantaneous speed. Such as photoelectric encoders, resolvers and Hall sensors, etc. However, in complex environments, mechanical sensors may have problems such as high environmental requirements, slow response, weak anti-electromagnetic interference, and aging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/24H02P21/13H02P21/18H02P21/00H02P25/022
CPCH02P21/24H02P21/13H02P21/18H02P21/0003H02P25/022H02P2207/05
Inventor 吕德刚佟泉谊
Owner HARBIN UNIV OF SCI & TECH
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