Abstract
Force and Velocity Ripple Reduction of the New Linear Motor
Highlights
Linear motor is a key component in industrial instruments, transportation systems and household appliances, such as position tracking for DNA analysis, rail transportation, linear motor based lifts and linear compressors, etc. [1,2,3,4,5,6]
In this paper, a linear motor equipped with an E-core stator is proposed and the force ripple reduction is realized by optimizing the magnetic path structure of the motor and designing a force compensation method
The structure and operation principles of the motor are firstly introduced. This motor has only one permanent magnet (PM) ring mounted on the surface of the mover and the moving stroke can be improved by this structure
Summary
Linear motor is a key component in industrial instruments, transportation systems and household appliances, such as position tracking for DNA analysis, rail transportation, linear motor based lifts and linear compressors, etc. [1,2,3,4,5,6]. Linear voice coil motors are popular in the market and widely employed in industrial devices such as wire bonders They have a fast response and can achieve a high frequency moving cycle due to the light weight of their moving parts. A lot of industrial equipment require micro components and LOM are employed to realize force control such as microchip surface mounted applications. Windings and springs on the mover is an effective way to reduce the cogging force. Using magnetic springs could reduce drive losses for linear motors, the nonlinear force output characteristic of magnetic springs could deteriorates the performance of highly precise force control. Apart from the optimization of the mechanical structure, some advanced control methods are developed to mitigate the force ripples of the linear motors [34, 35]. With the pole optimization and the force compensation, the force ripples can be effectively curbed by identifying and operating on the varied parameters of the motor
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