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Low-speed position-sensor-free vector control system and method for surface-mounted permanent magnet synchronous motor

A permanent magnet synchronous motor and vector control technology, which is applied in vector control systems, control systems, motor control, etc., can solve problems such as narrow current loop bandwidth and high noise, achieve high current bandwidth, ensure dynamic performance, and improve estimation accuracy Effect

Inactive Publication Date: 2018-11-27
SHANDONG UNIV
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Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes a low-speed position sensorless vector control system and method for surface-mounted permanent magnet synchronous motors. The present invention uses a high-frequency pulse vibration square wave injection scheme with an injection frequency equal to the PWM switching frequency, combined with double sampling The demodulation measures of dual update and subtraction of the deviation current twice in a row realized the separation of the high-frequency current response and the fundamental wave current, and finally obtained the estimated information of the rotor position angle and rotor angular velocity by using the position observer, thereby solving the problem of the table Stick-type permanent magnet synchronous motor without rotor position sensor vector control system has problems such as large noise and narrow current loop bandwidth at zero speed and low speed

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[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless otherwise specified, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0042] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and...

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Abstract

The invention discloses a low-speed position-sensor-free vector control system and method for a surface-mounted permanent magnet synchronous motor. According to the invention, by using a high frequency pulsation square wave injection scheme that the injection frequency thereof is equal to the PWM switching frequency, and by combining with demodulation measures of double sampling and double updating and consecutive two deviation currents being subtracted, the separation of high frequency current response and fundamental current is realized, and finally, estimation information of the position angle and angular speed of a rotor are obtained. The obtained current bandwidth of the control system is higher, which is the same as that of the vector control system having a rotor position and without applying high frequency injection; thus, the dynamic performance of the system is ensured.

Description

technical field [0001] The invention relates to a low-speed position sensorless vector control system and method of a surface-mounted permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor (Permanent magnet synchronous motor, PMSM) has the characteristics of high torque density and high efficiency, and has been widely used in servo control fields such as aerospace, industrial fields, electric vehicles, and household appliances. According to the different rotor structures, PMSM can be divided into two categories: surface-mounted PMSM (SPMSM) and embedded PMSM (interior PMSM, IPMSM). The former is a hidden pole structure, and the latter is a salient pole structure. Compared with the embedded PMSM, the SPMSM occupies the mainstream of the servo field because of its simple structure and convenient control. For synchronous operation of PMSMs, rotor position information is indispensable. Typically, the rotor position is obtained wit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/24H02P21/18H02P25/022
CPCH02P2203/11H02P2207/05H02P21/18H02P21/24H02P25/024
Inventor 刘锦波
Owner SHANDONG UNIV
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