Investigation of a Five-Phase Dual-Rotor Permanent Magnet Synchronous Motor Used for Electric Vehicles

Abstract

This paper presents a novel five-phase permanent magnet synchronous motor (PMSM), which contains dual rotors and a single stator, equivalent to two five-phase motors working together. Thus, this kind of motor has the potential of good fault tolerant capability and high torque density, which makes it appropriate for use in electric vehicles. In view of the different connection types, the inside and outside stator windings can be driven in series or parallel, which results in the different performances of the magnetomotive force (MMF) and torque under open-circuit fault conditions. By decomposing the MMF, the reason that torque ripple increases after open-circuit faults is explained, and the relationship between MMF and torque is revealed. Then, the current control strategy is applied to adjust the open-circuit faults, and the electromagnetic analysis and MMF harmonics analysis are performed to interpret the phenomenon that the torque ripple is still larger than in the normal situation. The investigations are verified by finite element analysis results.

Analysis and Speed Ripple Mitigation of a Space Vector Pulse Width Modulation-Based Permanent Magnet Synchronous Motor with a Particle Swarm Optimization Algorithm

“…Permanent magnet synchronous motors (PMSMs) have been widely used in industrial automation and robotics because of their advantages of high power density and efficiency, high power factor, and maintenance-free operation [1,2]. Because PMSMs cannot self-start, PMSM speed control is often adopted using frequency modulation.…”

Open-Phase Fault Tolerance Techniques of Five-Phase Dual-Rotor Permanent Magnet Synchronous Motor

“…As shown in Figure 1, the five-phase DRPMSM consists of two rotors and one stator, which combines the advantages of high fault tolerance of multi-phase machines and high power density of dual rotors machines and permanent magnet machines. The motor can be seen as a combination of an "inner motor" and "outer motor", of which the inner motor is composed of the inner rotor and the inside windings of the stator, and the outer motor is composed of the outer rotor and the outside windings of the stator [11]. If inside and outside windings of the stator are connected in series, the motor can be driven by only a set of five-leg drivers, which is the machine's series drive mode.…”

“…Energies 2015, 8, page-page 2 the inner rotor and the inside windings of the stator, and the outer motor is composed of the outer rotor and the outside windings of the stator [11]. If inside and outside windings of the stator are connected in series, the motor can be driven by only a set of five-leg drivers, which is the machine's series drive mode.…”

Electromagnetic Design and Analysis of a Novel Fault-Tolerant Flux-Modulated Memory Machine

“…Electric machines have a prominent role in modern energy conversion systems, such as wind power generators and electric vehicles (EVs) [1][2][3][4][5]. Due to the high torque density and high efficiency, permanent magnet machines have been widely used.…”