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This paper mainly focuses on the analysis of the eddy current loss in permanent magnet (PM) of the surface-mounted PM vernier machine (SPMVM). The eddy current losses under open-circuit, armature reaction and load conditions are detailed investigated by the analytical method and finite-element analysis (FEA). The influence of the pole ratio, which is defined as the ratio of the rotor PM pole-pairs...
This paper mainly deal with the radial force and vibration of the surface-mounted permanent magnet vernier machine (SPMVM) with the integer slot distributed windings (ISDW) and the fractional-slot concentrated windings (FSCW). The harmonic order and frequency of the radial force in SPMVM with the permanent magnet surface-mounted on rotor or stator tooth are detailed discussed by the analytical and...
Due to the high torque density and sharing similar operating principles with vernier machines, the magnetic-geared permanent magnet machines have been gaining more attention recently. This paper focuses on power transferring feature of a magnetic geared machine among the stator, modulation layer and rotor by analytical methods. Analytical equations of the back electromotive force, torque and power...
This paper investigates the production tolerances and variations of the lamination and permanent magnet on the cogging torque of the surface permanent magnet (SPM) machine with mass production. The finite element analysis (FEA) and experiment contrasted analysis method is adopted to deal with the additional component cogging torque, of the 12 slots 10 poles combination SPM machine, caused by production...
In recent years, surface permanent-magnet vernier machines (SPMVM) have been attracting more and more attention for several advantages, including a high torque density and a simple mechanical structure. However, the influence of the pole ratio, which is defined as the ratio of rotor pole pair numbers to winding pole pair numbers, and the winding pole pair numbers on the performance of SPMVMs has not...
Vernier machine is becoming a new generation of direct drive motor due to its feature of high torque at low speed based on the so-called “magnetic gear effect”. This paper investigates the winding pole number and the pole ratio defined as rotor pole number/winding pole number of the surface permanent magnet vernier machines (SPMVM) for performances of torque, power factor, etc. The variation of design...
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