A kind of open-loop control method of permanent magnet synchronous motor

Abstract

The invention provides a PMSM open loop control method. The method comprises the steps of improving a sliding mode system and introducing boundary layer controlling; using switching output to improve system response speed when the system hasn't got into a boundary width scope; and replacing routine switch functions with a continuous function to reduce buffeting after the system gets into the boundary width scope. The method also comprises the step of using a phase-locked loop (PLL) to replace a traditional direct calculating mode to reduce buffeting and the position signal fluctuation caused by a clutter in a signal. Compared with the traditional mode, the PMSM open loop control method has the advantage of small output position signal vibration without increasing scheme cost.

Description

technical field [0001] The invention belongs to the field of open-loop control of permanent magnet synchronous motors, and relates to a method for realizing open-loop control of permanent magnet synchronous motors by using a sliding mode variable structure and a PLL phase-locked loop. Background technique [0002] 1) The equivalent circuit of the surface-mounted permanent magnet synchronous motor in the α-β coordinate system is as follows figure 1 shown. [0003] 2) The mathematical model of the surface-mounted permanent magnet synchronous motor is as follows: [0004] [0005] in [0006] Formula 2 [0007] Formula 1 can be rewritten as [0008] [0009] which is [0010] [0011] in [0012] i s =[i α i β ] T , defined as the α and β axis currents; [0013] u s =[u α u β ] T , defined as the α and β axis voltages; [0014] e s =[e α e β ] T , defined as the α and β axis back EMF; [0015] [0016] 3) Sliding mode observer equation: ...

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Problems solved by technology

[0030] b. Because this system needs to operate in a complex industrial environment, the detection signal i s There are more interferences in it, which will also cause large fluctuations in the output position signal

If the filtering link is added, the signal response speed will be reduced

[0031] c. For the harmonic components in the signal sampling, only the image 3 The filter coefficient of the second low-pass filter is increased, but this will lead to a larger phase lag and increase system risk

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