Quantitative Comparison of Vernier Permanent-Magnet Motors with Interior Permanent-Magnet Motor for Hybrid Electric Vehicles

Abstract

In this paper, three Vernier permanent-magnet (VPM) motor, namely the inner-rotor VPM (IR-VPM) motor, the outer-rotor VPM (OR-VPM) motor and the OR consequent-pole VPM (OR-CP-VPM) motor are proposed for the hybrid electric vehicle (HEV) applications. Owing to employment of toroidal-winding arrangement, the OR-VPM and the OR-CP-VPM motors can enjoy better material utilization and easier manufacturing process than its IR-VPM counterpart. Meanwhile the OR-CP-VPM motor can utilize the consequent-pole topology to minimize flux leakage that exists in conventional design. With the support of finite element method (FEM), the motor performances among the VPM motors and the profound interior permanent-magnet (IPM) motor can be compared quantitatively.

In-Wheel Motor Drive Systems for Electric Vehicles: State of the Art, Challenges, and Future Trends

“…Like PMSM motors, vernier motors also typically have inner-rotor topologies and have similar disadvantages, such as long end-windings and the inefficient use of motor inner space, and to overcome these two advantages [146] proposed an outerrotor VPM using toroidal winding. A quantitative comparison among inner-rotor VPM (IR-VPM), outer-rotor VPM (OR-VPM), and outer-rotor consequent pole VPM (OR-CP-VPM) has been carried out in [147]. It is concluded that by employing toroidal winding and outer rotor topology, the motors achieve higher efficiencies and torque density.…”

Electric Drives and Power Chargers: Recent Solutions to Improve Performance and Energy Efficiency for Hybrid and Fully Electric Vehicles

“…A key component of EVs is the electric motor, which should be able to provide high efficiency, high power density, high torque density, high cost-effectiveness and maintenancefree operation [9]. Most of these tasks are fulfilled by permanent-magnet motors, and 3 motor types, namely interior permanent-magnet (IPM), flux-switching permanent-magnet (FSPM) [10] and Vernier permanent-magnet (VPM) [11], are considered the most promising candidates for EV applications.…”

Split Pole Permanent Magnet Vernier Machine With Halbach Array Magnets in Stator Slot Opening and Consequent Pole Rotor

“…Different winding configurations are investigated to improve the torque production capability. An outer rotor PMVM with a hybrid excitation source is proposed in [8], in which a homopolar configuration is adopted and trickily combined the flux route of the PM with the electromagnet flux route to achieve a compact structure.…”