Filter-free permanent magnet synchronous motor rotor initial position identification method

Abstract

The invention relates to a filter-free permanent magnet synchronous motor rotor initial position identification method and belonging to the field of motor control to solve the problems that an existing permanent magnet synchronous motor rotor initial position identification process is low in precision and has an identification result affected by the amplitude and the frequency of an input signal and a filter has an influence on the stability of the system. The method of the invention comprises inputting a high-frequency pulse vibration signal into the stator winding of the motor; obtaining a position deviation signal by subjecting a response current to coordinate transformation and signal processing; locking the position deviation signal to obtain a rotor position initial identification result [theta]<^>; determining the polarities of the N and S poles of the rotor by using a magnetic saturation effect so as to obtain a rotor initial position identification value. The filter is removedduring the identification process, which can suppress the influence of the filter on the system bandwidth and stability, and remove the influence of the amplitude and frequency of the input signal onthe identification accuracy. The algorithm is simple and reliable.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for identifying the initial position of a rotor of a permanent magnet synchronous motor without a filter. Background technique [0002] Since the permanent magnet motor does not have the self-starting ability, it needs to obtain an effective initial position of the rotor when starting. If the initial position is not accurate, the motor will not start with the maximum torque, or even "reverse", resulting in failure to start. Therefore, accurate identification of the initial position is the key to the normal start of the permanent magnet synchronous motor. [0003] At present, the rotor initial position identification methods can be divided into two types: rotating identification method and static identification method. Chinese invention patent CN 108683371 A published on October 19, 2018, "Rotor Magnetic Pole Initial Position Identification Method, Device, System, and Motor ...

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Problems solved by technology

[0006] Aiming at the problem of poor dynamic performance in the identification process of the initial position of the rotor of the permanent magnet synchronous motor in the filter link, and the identification result is easily affected by the injected signal, the present invention proposes a method for identifying the initial position of the rotor of the permanent magnet synchronous motor without a filter. Inject a high-frequency pulse vibration signal into the stator winding, and obtain the position deviation signal through coordinate transformation and signal processing of the response current, and phase-lock the position deviation signal to obtain the initial identification result of the rotor position

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