Computer Aided Design Of Halbach Permanent Magnet Motor

With the development of modern Permanent Magnet (PM) machine to high speed, high efficiency, high power density and micromation, the limitation of traditional rare earth PM machine is exhibited, such as higher ripple-free torque, higher losses, lower open-circuit magnetic field, etc.Halbach motor, a new type permanent magnet motor, first proposed by American scholar Klause Halbach, has been studied very widely. Halbach motor has higher magnetic field, usually as 1.4 times as that of traditional rare earth permanent magnet machine, which attributes to higher power density. Inherent sine-wave contributed magnet makes it more convenient for the design and manufacture of the motor. Self-shielding attributes to great flexibility of choosing the rotor material. Slotless can eliminate ripple-free torque completely.This paper demonstrates the fundamental principle systematically, including the design process of a Halbach motor. In order to make the design more easier and reduce the designing period, CAD is applied to the motor design: the concise Matlab language, to some extend, reduces the workload in electromagnetism design; The mathematic modeling and collating programs compiled by APDL language in ANSYS substantiate the precision of the electromagnetism design. Based on the ideas above, this paper gives the elaborate electromagnetism design process of a 5KW Halbach motor.