Design and analysis of a Halbach arc linear permanent magnet machine for large telescope application

Ia this paper, a Halbach arc linear permanent magnet machine (ALPMM) for large telescope application is analyzed by finite element method. The ALPMM consists of one rotor and three segmental stators in which the stator core and windings are characterized by “C” shape. A 3-D air-gap, which can significantly increase the torque density, is formed between the C-shape stator and the rotor. The key electromagnetic parameters of the ALPMM are designed. A simplified 2-D model is proposed to investigate the electromagnetic performances of the ALPMM. Further, a modified 2-D model is developed for precise results which are approximately the same with those of the 3-D model, when the axial length of the 2-D model is 85% of the total active winding length of the 3-D model.