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This paper is to compare five different rotor topologies of distributed winding interior permanent-magnet (IPM) machine for electric vehicles. Their characteristics, which include back-electromotive force, torque, overload capability, flux weakening performance and d-q axis inductances are comparatively evaluated. This work gives some guidance and reference for machine designers who are interested...
Normal force is the dominant source of vibration in the linear permanent-magnet (LPM) machine. In order to investigate vibration of a new LPM vernier machine, normal pressure and their spatial harmonics are calculated by finite element method. Then, the natural vibration modes and transient displacement of the short mover is predicted. Finally, experimental result is given for verification. Results...
In this paper, new high temperature superconducting (HTS) vernier machines with all HTS excitations on the stator, termed as stator HTS vernier machines, are proposed and investigated. Since all the HTS excitations are mounted on the stator, the proposed HTS machines take the merits of low cost refrigerating system for HTS excitations and high torque density due to the HTS excitations and magnetic...
Linear permanent magnet vernier (LPMV) motor incorporates the merits of high efficiency and low cost since its magnets and windings are located in the short primary, which is very suitable for long stroke applications. The novelty of this paper is to investigate effects of the pole ratio on performances of the LPMV motor by using finite-element method (FEM). The FEM-based results reveal that the pole...
Fractional-slot permanent-magnet (FCSPM) machines offer several advantages, but they suffer from the high content of space harmonics in the air-gap magnetic motive force (MMF) distribution. The MMF space harmonic amplitude and frequency depend on the particular combination of numbers of slots and poles. Such harmonics induce losses in the rotor since they are not synchronous with the rotor speed....
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