Cogging force suppression method for flux-switching linear motor

Abstract

The invention discloses a cogging force suppression method for a flux-switching linear motor, which is used for realizing the purpose of suppressing a cogging force and velocity fluctuation by a novel repetitive controller and a position recursive control algorithm, and realizing a position-free sensing technology simultaneously. According to the cogging force suppression method, a time-varying t-domain signal is converted to an x-domain signal with a fixed period, and then the design of the repetitive controller is carried out on the x-domain signal, thus achieving the purpose of suppressing a cogging force and velocity fluctuation; meanwhile, in order to accurately obtain the position and velocity information of LFSPM, the invention puts forward that the position recursive control algorithm is used for replacing a position sensing technology simultaneously, thus the rotor position information of the flux-switching linear motor can be accurately and effectively detected in real time.

Description

technical field [0001] The invention relates to a method for suppressing positioning force of a magnetic flux switching linear motor, which adopts an improved repetitive controller and a position recursive control algorithm to realize the purpose of suppressing positioning force and speed pulsation, and at the same time realizes no position sensing technology. Background technique [0002] The permanent magnet synchronous motor has the advantages of high power factor, high power density, strong overload capacity and strong output rotation capacity, etc., and has been applied in the fields of household appliances, ship propulsion, CNC machine tools and robot drives. Expand widely. With the advancement of high-energy rare earth permanent magnet material technology, since the early 1990s, permanent magnet double salient permanent magnet motors (DSPM) have appeared one after another. Subsequently, in 1996 and 1997, two new types of permanent magnet motors were proposed abroad. ...

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Problems solved by technology

The literature compensates the magnetic groove positioning force of the permanent magnet synchronous motor under ideal conditions by changing the q-axis current, and has achieved some results in low-speed operation occasions. The literature proposes a method that generates additional rotation components by injecting corresponding harmonic currents. , so that it is equal to the amplitude of the fundamental wave and the higher harmonic component in the positioning force, and the phase is opposite, which can cancel each other out, so as to achieve the purpose of compensating the positioning force, but the above two methods will generate additional harmonics due to the injection of harmonic current positioning force, and the harmonic current injection process is relatively cumbersome

In recent years, extensive research has been done on suppressing repeated constant periodic thrust fluctuations in the time t domain. Since the positioning force is a non-constant periodic signal in the t domain, and the LFSPM motor often works in a non-constant speed state, it is obvious for Suppression of periodic positioning forces with a period of position is not suitable for

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