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Permanent magnet synchronous motor initial position detection method

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 detection error, simplify implementation algorithm, and have the effect of strong practicability

Active Publication Date: 2020-07-28
HUAZHONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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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  • Permanent magnet synchronous motor initial position detection method
  • Permanent magnet synchronous motor initial position detection method
  • Permanent magnet synchronous motor initial position detection method

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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] like 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 signal ...

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Abstract

The invention discloses a method for detecting the initial position of a permanent magnet synchronous motor. According to the method, based on an initial position detection principle of a sampling high-frequency pulsating injection and pre-positioning, a high-frequency pulsating voltage is injected into an estimated two-phase rotating coordinate; a rotor initial position initial estimated value isacquired by extracting a current amplitude, and the positive direction of a d axis is judged by injecting a voltage pulse vector, so that a rotor initial position final estimated value is acquired onthe basis of high-frequency pulsating injection; and finally a rotor is locked to the rotor initial position final estimated value by adopting a pre-positioning method. According to the invention, the problem of estimation errors caused by filter phase lag of a traditional high-frequency pulse vibration injection method is effectively solved while the algorithm is simplified, an accurate rotor position estimation value can be acquired, and the problem that the rotor rotation amount is too large due to a direct pre-positioning method is also avoided.

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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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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