Abstract
This paper presents a comparative analysis of two parallel hybrid magnet memory machines (PHMMMs) with different permanent magnet (PM) arrangements. The proposed machines are both geometrically characterized by a parallel U-shaped hybrid PM configuration and several q-axis magnetic barriers. The configurations and operating principles of the investigated machines are introduced firstly. The effect of magnet arrangements on the performance of the proposed machines is then evaluated with a simplified magnetic circuit model. Furthermore, the electromagnetic characteristics of the proposed machines are investigated and compared by the finite-element method (FEM). The experiments on one prototype are carried out to validate the FEM results.
Highlights
Memory Machines with Different PMRecently, permanent magnet (PM) machines have been widely used in electric vehicle (EV) applications due to their high power density and efficiency [1,2]
The flux adjusting principle can be illustrated from the perspective of the simplified hysteresis model of low coercive force (LCF) PMs
Structures show a small cross-coupling demagnetization ratio under the “Kmr = −0.5” state. This is because the HCF PMs are short-circuited by LCF PMs, leading to a flux loop formed within the rotor core
Summary
Permanent magnet (PM) machines have been widely used in electric vehicle (EV) applications due to their high power density and efficiency [1,2]. The most important design requirements of traction machines for electric vehicles are to achieve rated operating conditions (torque) and maximum operating range (maximum speed). The low coercive force (LCF) magnet in VFMM makes air-gap flux regulation convenient by applying a temporary magnetizing or demagnetizing current pulse [3,4]. The LCF PM is susceptible to the on-load demagnetization caused by armature reaction or NdFeB PM field, thereby reducing the torque density [12,13]. For addressing this issue, the rotor can be improved by adding multiple q-axis magnetic barriers.
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