Low-noise permanent magnet synchronous motor rotor initial position detection method

Abstract

The invention discloses a low-noise permanent magnet synchronous motor rotor initial position detection method, and relates to the field of motor control. The problem that the traditional initial position detection method generates relatively big vibration and loud noise when the position and the polarity of a magnetic pole is detected, so that the application thereof is limited in certain occasions with higher requirements on noise is solved. The method comprises the following steps: Step 1, identifying an estimated value theta est1 of the initial position of the magnetic pole by adopting a voltage injection method based on random high-frequency square wave aiming at a high-frequency mathematical model of a built-in permanent magnet synchronous motor; Step 2, observing the sign of the accumulated value of the high-frequency response current peak value of a gamma axis in the high-frequency mathematical model of the built-in permanent magnet synchronous motor based on the stator core saturation nonlinearity principle, and identifying the polarity information of the magnetic pole of a rotor; and Step 3, correcting and compensating the estimated value theta est1 of the initial position of the magnetic pole according to the polarity information of the magnetic pole of the rotor to obtain the estimated value theta est of the initial position of the rotor. The low-noise permanent magnet synchronous motor rotor initial position detection method is mainly used for detecting the initial position of the permanent magnet synchronous motor rotor.

Description

technical field [0001] The invention relates to the field of motor control. Background technique [0002] With the development of mechanization and electrification in the world, the motor has always been a very important link in the process of electromechanical energy conversion. In recent years, permanent magnet synchronous motors have become an ideal choice for frequency conversion and speed regulation electric drive systems due to their simple structure, small size, high power density, high efficiency, and good speed regulation performance. They have outstanding performance in the field of small and medium power applications. . Since permanent magnets are installed on the rotor, no additional current is required to excite the PMSM rotor. According to the structure of the permanent magnet synchronous motor rotor, it can be divided into two types: surface mount type and built-in type. [0003] At present, in the application of high-performance permanent magnet synchronou...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the traditional initial position detection method produces relatively large vibration and noise when detecting the position and polarity of the magnetic pole, which leads to the problem that the application is limited in some occasions with relatively high noise requirements. The present invention provides a Low noise permanent magnet synchronous motor rotor initial position detection method

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