Performance Comparison of Outer Rotor Permanent Magnet Vernier Motor For Direct Drive Systems

فاقد چكيده فارسي

This paper compares four Outer Rotor Permanent Magnet Vernier Machines (ORPMVM) for directdrive systems with the focus on a novel Vernier Machine (VM). All machines have the same rotor, but difference stator topologies and winding arrangements. The proposal has toroidal coils and an open-slot stator with a high number of slots. The other machines have split-stator. The topologies and working principles are presented in detail. Electromagnetic performance of the machines at both no-load and full-load is investigated by two-dimensional Finite Element Analysis (2D FEA). The comparison is conducted in terms of output electromagnetic torque, core loss, copper loss, efficiency, and iron volume at the same outer diameter, air-gap length, phase current, and permanent magnet volume. According to the simulation results, the proposal has higher efficiency, output torque, and lower iron volume in contrast with the conventional machines.