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Description
Low-speed and high-torque permanent magnet motors (LSHT-PMM) are widely used in many industrial fields. Due to the inherent characteristics, the outer diameter of the LSHT-PMM is large. Therefore, in order to make full use of the internal space of the motor, a double stator structure is proposed in this paper. In order to reduce the amount of permanent magnets (PMs) and reduce the cost, a PM and reluctance hybrid rotor is proposed. The proposed hybrid rotor structure is a combination of a magnetic barrier reluctance rotor and a permanent magnet rotor which are embedded on the inner and outer sides of the magnetic isolation ring respectively. The proposed rotor not only has the advantages of a PM assisted reluctance rotor, but also makes the design method more flexible due to the structures of PM and magnetic barrier reluctance relatively independent. In this paper, the electromagnetic design method of the proposed LSHT-PMM is studied in detail. Firstly, in order to determine the stator design, the different winding connection modes, slot-pole combination and winding distribution of the inner and outer stators are compared and analyzed. Secondly, in order to design the novel rotor, the influence of the relative position between the magnetic barrier and the PM, the shape of PM, the width and the number of the magnetic barrier rotor on the electromagnetic performance of the proposed LSHT-PMM are studied based on the field-circuit coupling method. Finally, the correctness and rationality of the designed motor are verified by the simulation and experiment. This work is supported by the National Natural Science Foundation of China under Grant 51877139.
