A speed pulsation suppression method for flux switching linear motor

Abstract

The invention discloses a method for suppressing velocity fluctuation of a flux-switching linear motor. The method includes inputting harmonic current to compensate thrust fluctuation caused by positioning force; compensating thrust fluctuation caused by uncertainties such as friction and parametric variations via a disturbance observer, so that the thrust fluctuation is further weakened. The method can effectively suppress positioning force and velocity fluctuation.

Description

technical field [0001] The invention relates to a method for suppressing speed pulsation of a magnetic flux switching linear motor, belonging to the field of speed pulsation control of a linear motor. Background technique [0002] It has been more than 140 years since the world's first subway (6km) was put into operation in London, England in 1863. According to the Japan Metro Association, at present, more than 120 cities in more than 40 countries and regions around the world have subways, with a total operating mileage of more than 7,000km. Subways have become the mainstream mode of urban rail transit vehicles. In addition, light rail, trams, suburban commuter vehicles and new transportation systems have all been applied and developed to varying degrees. They are all driven by rotating motors and rely on wheel-rail adhesion to transmit traction / braking force. Due to its simple structure, mature technology, large carrying capacity, and low running resistance, this technica...

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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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