Method for detecting initial position of magnetic pole of rotor of built-in permanent magnetic synchronous motor

A permanent magnet synchronous motor, initial position detection technology, applied in the control of generators, electronic commutators, motor generators, etc., can solve the problems of misjudgment of polarity, poor practicability, complex signal processing, etc., and achieve satisfactory identification Accuracy, simple processing method, reliable effect of judging the rotor magnetic pole polarity method
CN101714844AInactive Publication Date: 2010-05-26哈尔滨同为电气股份有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
哈尔滨同为电气股份有限公司
Publication Date
2010-05-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for detecting the initial position of a magnetic pole of a rotor of a built-in permanent magnetic synchronous motor, belongs to the field of motor control, and solves the problems of over-complicated processing, easy occurrence of polarity misjudging, poor practicality and the like existing in the conventional method based on high-frequency signal injection for detecting the initial position of the rotor. The method comprises the following steps: constantly maintaining the stationary state of the rotor; injecting a rotating high-frequency voltage signal into a stator winding; detecting three-phase stator current and converting the three-phase stator current into two-phase static coordinates; acquiring an error signal capable of reflecting position information of the magnetic pole of the rotor through signal processing; adjusting the error signal by using a PI tracker so as to acquire an initial judging value of the position of the magnetic pole of the rotor; and injecting two impulse voltage vectors in opposite directions into the stator winding, comparing values of direct axis current components by detecting the three phase current and converting the rotating coordinates so as to determine the polarity of the magnetic pole, and finally acquiring the initial position angle of the magnetic pole of the rotor of the built-in permanent magnetic synchronous motor.
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Description

technical field

[0001] The invention relates to a method for detecting the initial position of a rotor magnetic pole of a built-in permanent magnet synchronous motor, belonging to the field of motor control. Background technique

[0002] In recent years, the built-in permanent magnet synchronous motor speed control system has gradually become a research hotspot in the field of AC speed control transmission. The reason is that compared with the traditional asynchronous motor, the advantages of the built-in permanent magnet synchronous motor are: high efficiency and energy saving, high power factor, high power density, strong overload capacity, etc. Ideal for drivetrains. According to the different structure of the rotor permanent magnet of the built-in permanent magnet synchronous motor, it can be divided into surface type and built-in type. The permanent magnet of the built-in rotor magnetic circuit structure is located inside the rotor. Due to the asymmetric structure of t...

Claims

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