To eliminate thrust fluctuations in a system where multi-converter alternately feeds segmented long stator linear motors(SLSLM),a current cooperative control solution is proposed.First,in circuit topology,the neutrals of stator segments powered by the same converter are connected.The switching strategy of the current-over-zero turn-on is utilized to ensure that the current in the converter remains continuous and distortion-free while transitioning from one stator segment to another.Then,the voltage and thrust equations for the unit motor are established.The state equations corresponding to the sum-of-currents and difference-of-currents of the two unit motors are derived from the unit motor's state equations,and the corresponding current co-controller is designed.The motor thrust is controlled by the sum-of-currents,and the thrust fluctuation is controlled by the difference-of-currents.The thrust fluctuation of the mover passing through two stator segments is decreased,and the decoupling control between thrust and thrust fluctuation due to current deviation is achieved by the proposed current control strategy.Simulation and experiments results validate the effectiveness of the proposed method.
关键词
长定子直线电机定子段/协同控制/多变流器/分段供电/推力波动
Key words
segmented long stator linear motors(SLSLMs)/cooperative control/multi-converters/segmented powered/thrust fluctuation
维普
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