Abstract:

Based on the working principle of magnetic field modulation, a new type of magnetic barrier coupling primary permanent magnet linear motor (MBCPPMLM) is proposed. Compared with linear induction motors, this motor has the outstanding advantages of large thrust, low noise, high power factor which is especially suitable for long-term rail transit. Based on the analysis of the structure and operating mechanism of the motor, the equivalent magnetic circuit method is used to analyze the performance parameters of the motor such as equivalent speed, air gap equivalent magnetic density, and thrust force. Five typical structures of MBCPPMLM with 6 primary slots armature winding poles of 2, and permanent magnet poles of 6, 12, 18, 24, and 36 are designed for parametric modeling and magnetic field performance analysis. Fourier decomposition is used to compare and analyze the effective magnetic field content of different slot poles. The air gap magnetic density, winding back electromotive force, and no-load positioning force are compared. The effect of the current on the static electromagnetic thrust is compared with that of ordinary salient poles. The comparison of the electromagnetic performance of the ordinary salient poles primary permanent magnet linear motor verifies that the new magnetic barrier coupled primary permanent magnet linear motor has good performance.

Key words: Magnetic barrier coupling, permanent magnet linear motor, finite element, force ripple