Analysis of a Novel Consequent-Pole Halbach-Array Dual-Electrical-Port Dual-Mechanical-Port Machine

The brushless dual-mechanical-port dual electrical-port (DEP-DMP) machine is a preferable selection for the continuously variable transmission device in hybrid system, due to its high compactness, contactless transmission and fast dynamic response. However, its torque density is relatively low because of the large effective airgap length. A novel DEP-DMP machine is proposed in this paper, where the consequent-pole Halbach-array magnets are placed at the outer rotor. In this way, the permanent magnet (PM) rotor of the PM synchronous machine (PMSM) part changes from the inner rotor to outer rotor, and the effective airgap length is greatly reduced, thus the outer airgap flux density and torque density are significantly improved. Besides, the magnet of the inner rotor is changed into consequent-pole to reduce effective length of inner airgap, enhance flux modulation effect and save PM usage. The performances of the proposed and conventional DEP-DMP machines are compared, and the conclusion is drawn at last.