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A method for detecting the initial position of a permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and detection method, applied in the direction of controlling generator, motor generator control, controlling electromechanical transmission device, etc., to avoid phase lag, simplify implementation algorithm, and have the effect of strong practicability

Active Publication Date: 2021-10-26
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

It effectively solves the estimation error problem caused by the phase lag of the filter of the traditional high-frequency pulse vibration injection method, and at the same time simplifies the algorithm and improves the accuracy of rotor position estimation

Method used

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  • A method for detecting the initial position of a permanent magnet synchronous motor
  • A method for detecting the initial position of a permanent magnet synchronous motor
  • A method for detecting the initial position of a permanent magnet synchronous motor

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0034] Such as figure 1 As shown, the present invention provides a control system for detecting the initial position of a permanent magnet synchronous motor.

[0035] The principle of initial position detection is as follows:

[0036] To simplify the analysis, assuming that the magnetic field is sinusoidal in spatial distribution, and ignoring eddy current loss and hysteresis loss, the PMSM voltage equation under high-frequency excitation is

[0037]

[0038] (1) where: u dh , u qh and i dh i qh are the high-frequency stator voltage and current components in the rotor d-q rotating coordinate system; Rdh, Rqh and Ldh, Lqh are the high-frequency resistance and inductance of each axis in the coordinate system; D is the differential operator. Assume that the frequency of the high-frequency sign...

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Abstract

The invention discloses a method for detecting the initial position of a permanent magnet synchronous motor. This method samples the initial position detection principle of high-frequency pulse vibration injection + pre-positioning method, first injects high-frequency pulse vibration voltage on the estimated two-phase rotating coordinates, obtains the initial estimated value of the initial rotor position by extracting the current amplitude and injects the voltage The positive direction of the d-axis is judged by the pulse vector, and the final estimated value of the initial rotor position is obtained. On the basis of high-frequency pulse vibration injection, the rotor is finally locked to the final estimated value of the initial rotor position by the pre-positioning method. The invention effectively solves the estimation error problem caused by the phase lag of the filter in the traditional high-frequency pulse vibration injection method, and at the same time simplifies the algorithm, can obtain accurate rotor position estimation values, and avoids excessive rotor rotation caused by the direct pre-positioning method The problem.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for detecting the initial position of a permanent magnet synchronous motor. Background technique [0002] The existing methods for detecting the initial position of permanent magnet synchronous motors mainly include the following: [0003] Pre-positioning method: Apply a DC signal to the motor before the motor starts to let the motor rotor rotate and lock it to a specified angle. The advantage is that the initial angle of the rotor obtained is the actual angle of the rotor; but the disadvantage is also obvious. If the actual position of the rotor A large difference from the specified position applied will cause excessive rotation of the rotor, and in some cases the rotor is not allowed to rotate excessively; [0004] Voltage pulse method: When the motor is stationary, a series of voltage pulses with the same amplitude and different directions are applied, and the correspond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/32H02P21/18
CPCH02P21/18H02P21/32
Inventor 陈天航刘雄王昌杰占颂熊烁聂文强宋宝唐小琦周向东江平
Owner HUAZHONG UNIV OF SCI & TECH
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