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Pulse vibration high-frequency voltage injection-based six-phase permanent magnet synchronous motor sensorless control system and method

A voltage injection, high-frequency pulse vibration technology, applied in the field of permanent magnet synchronous motor sensorless control system, can solve the problems of complex algorithm, low reliability, poor dynamic performance, etc., to achieve simple implementation, strong practicability, and short detection period Effect

Inactive Publication Date: 2018-06-01
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a six-phase permanent magnet synchronous motor sensorless control system and method based on pulse vibration high-frequency voltage injection, which solves the problem of zero-speed and low-speed position identification of six-phase permanent magnet synchronous motors. , the existing problems of poor dynamic performance, low reliability and complex algorithm

Method used

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  • Pulse vibration high-frequency voltage injection-based six-phase permanent magnet synchronous motor sensorless control system and method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as Figure 1 to Figure 7 As shown, the embodiment of the present invention provides a six-phase permanent magnet synchronous motor sensorless control system based on pulse vibration high-frequency voltage injection. In order to obtain a simplified model that is easy to simulate and analyze, it is necessary to carry out coordinate transformation and The following assumptions are made: air gap magnetomotive force and flux linkage are sinusoidally distributed, magnetic saturation and core loss are ignored, and mutual leakage inductance between windings is ignored.

[0025] The voltage equation of the motor in the natural coordinate system is

[0026]

[0027] The flux equation is

[0028] ψ s =L s i s +γψ fd (2)

[0029] In the formula: u s =[u A u B u C u U u V u W ] T ;

[0030] i s =[i A i B i C i U ...

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Abstract

The invention discloses a pulse vibration high-frequency voltage injection-based six-phase permanent magnet synchronous motor sensorless control system and method, and belongs to the technical field of motor control. A band-pass filter is adopted to extract a high-frequency current signal comprising rotor position information; a low-pass filter is adopted to perform filtering on the extracted high-frequency current signal to obtain rotor error information; and a pulse vibration high-frequency voltage signal of a rotary coordinate system is injected into the motor, a stator winding current is sampled, and the position and the rotary speed of the motor rotor can be estimated from the high-frequency current correspondingly, so that quick, accurate and reliable initial position estimation on the six-phase permanent magnet synchronous motor rotor position can be carried out; and compared with the conventional back electromotive force method-based six-phase permanent magnet synchronous motorrotor position detection method, the method disclosed in the invention has relatively short detection period, simple realization and high practicability.

Description

technical field [0001] The invention relates to a sensorless control system and method for a permanent magnet synchronous motor, belonging to the technical field of motor control. Background technique [0002] The existing six-phase permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) position sensorless control method based on the back EMF of the motor, when the motor is running at low speed or zero speed, due to the small or zero back EMF of the motor, these control The method fails; the pulsating high-frequency voltage injection method is to inject a high-frequency sinusoidal voltage signal into the direct axis of the estimated two-phase rotating coordinate system, thereby generating a high-frequency pulsating magnetic field, which can excite the motor to generate inductance saturation The effect makes the surface-mounted permanent magnet synchronous motor present "salient polarity". By detecting the high-frequency current response containing the ...

Claims

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Application Information

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IPC IPC(8): H02P6/18H02P21/18H02P21/32
CPCH02P6/183H02P21/18H02P21/32H02P2203/03H02P2203/11
Inventor 任志冰
Owner HARBIN UNIV OF SCI & TECH
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