No-load Magnetic Field Analysis of the U-shaped Ironless Permanent Magnet Synchronous Linear Motor

Background: Due to the influence of core breaking, the traditional iron core linear motor has the end-effect of lateral and vertical side, which makes the output of the thrust line fluctuating greatly. The ironless permanent magnet synchronous linear motor has the advantages of zero slot effect, simple structure and flexible control. Methods: The study was based on the analysis of air gap magnetic field of ironless permanent magnet synchronous linear motor problems using two kinds of analytical methods, namely equivalent magnetic potential method and the equivalent magnetizing current method, and the finite element analysis of the magnetic field using the finite element method. Result: The analytical method for magnetic field analysis is verified to be accurate. Conclusion: By changing the motor parameters, the optimization design is achieved, which provides the reference for the design and analysis of same kind of motors.