A Novel Direct-Drive Permanent Magnet Synchronous Motor with Toroidal Windings

Abstract

A direct-drive motor has the merits of low speed, high torque, and elimination of mechanical deceleration mechanisms, and is widely used in various fields. A novel direct-drive permanent magnet synchronous motor is presented herein, in which all coils are wrapped around the stator yoke in the same orientation. The structure of the novel direct-drive permanent magnet synchronous motor with toroidal windings (N-TWDDPMSM) is introduced and its operating principle is analyzed by describing the variation in the armature magnet field versus time. Furthermore, based on the same power grade and mechanical size, several finite-element models of motors with different windings are established using Magnet software to analyze the distribution of magnetic field, back-electromotive force (back-EMF), power-angle characteristics, loss characteristics, etc. Compared with the traditional permanent magnet synchronous motor (T-PMSM), the traditional permanent magnet synchronous motor with toroidal windings (T-TWPMSM), and the N-TWDDPMSM, the N-TWDDPMSM shows advantages of low speed and high torque, and the feasibility and superiority of the N-TWDDPMSM are verified.

Feasibility analysis and optimization design of PMSM with 120° phase belts toroidal windings for electric vehicles

“…Therefore, the principle presented is correct, the finite-element model is reasonable, and the application of the 120°P BTWPMSM to electric vehicles is feasible. Nevertheless, it is necessary to optimise the 120°PBTWPMSM, because the torque ripple of the motor is large [5].…”

“…Therefore, research into permanent magnet synchronous motors for EVs has drawn much attention from scholars and many novel topologies of the motor are proposed. For example, a permanent magnet synchronous motor (PMSM) with 120°phase belts toroidal windings (PBTWs) (120°PBTWPMSM) is proposed in Gao et al [5].…”

Design and characteristic analysis of a six‐phase direct‐drive permanent magnet synchronous motor with 60° phase‐belt toroidal winding configuration for electric vehicle

“…1, which employs outer rotor core, surface‐mount permanent magnet, inner stator core and 60°‐TW. Different from regular TW, each coil of 60°‐TW is wound onto the stator yoke in the same direction [16].…”

Equivalent Circuit Model of Novel Solid Rotor Induction Motor with Toroidal Winding Applying Composite Multilayer Theory

“…The harmonic components in the field are not considered and the displacement current is ignored. 4. The stator winding current is equivalent to the current sheet at the interface of the air gap and stator.…”

“…The solid rotor induction motors (SRIM) is applied in many fields due to its simple structure, high reliability, and good starting performance [1]. Toroidal winding structures, such as high-frequency inductors, transformers, and electric machines, are used in various applications because of their short end winding, low maintenance cost, and flexible speed regulation [2][3][4]. Applying toroidal winding to SRIM, results in a solid rotor induction motor with toroidal winding (TWSRIM) that combines the advantages of a solid rotor and toroidal winding can be obtained [5].…”