Stator-Flux-Oriented Fault-Tolerant Control of Flux-Switching Permanent-Magnet Motors

Self Cite

Abstract:The flux-switching permanent-magnet (FSPM) motor has been viewed as a highly reliable machine with both armature windings and magnets on the stator. Owing to the high torque-production capability with low torque ripple, FSPM motors with a higher number of phases are potential candidates for traction applications in hybrid electric vehicles (HEVs). However, existing research has mostly focused on the principles and static performance of multiphase FSPM motors, and little attention has been paid to advanced control strategies. In this paper, the fully decoupled current control of a 36/34-pole nine-phase FSPM (NP-FSPM) motor is developed and the performance under different operating conditions is investigated. The aim of the design is to alleviate cross coupling effects and unwanted low-order stator harmonic currents, to guarantee fast transient response and small steady-state error. In addition, its fault-tolerance is further elaborated. These features are very important in automotive applications where low torque pulsation, high fault-tolerant capability and high dynamic performance are of major importance. Firstly, the research status of multiphase FSPM motors is briefly reviewed. Secondly, the mathematical model in the dq reference frames and control strategies are presented. Then, the control and performance of the NP-FSPM motor are evaluated by using MATLAB/Simulink. Finally, experiments on an NP-FSPM motor prototype are carried out to validate the study. OPEN ACCESSEnergies 2015, 8 10336

Section: Mathematical Modeling Based On Vsdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control and Performance Evaluation of Multiphase FSPM Motor in Low-Speed Region for Hybrid Electric Vehicles

Cheng

Chau

et al. 2015

Self Cite

“…Compared with the DSPM machine and the FRPM machine, the FSPM machine possesses the merits of higher power density and torque density [8], sinusoidal no-load EMF [9] and fault-tolerance capability [10][11][12][13][14], so FSPMs are attracting more and more attention and numerous novel rotary FSPM machines structures of have been proposed [15,16], such as the five-phase modular FSPM machine [17] and the hybrid excitation FS machine [18]. Meanwhile lots of linear versions of FSPM (LFSPM) machines also have been presented for linear industry applications [19].…”

Section: Introductionmentioning

confidence: 99%

Detent Force Reduction of a C-Core Linear Flux-Switching Permanent Magnet Machine with Multiple Additional Teeth

Yang

Quan

et al. 2017

C-core linear flux-switching permanent magnet (PM) machines (LFSPMs) are attracting more and more attention due to their advantages of simplicity and robustness of the secondary side, high power density and high torque density, in which both PMs and armature windings are housed in the primary side. The primary salient tooth wound with a concentrated winding consists of C-shaped iron core segments between which PMs are sandwiched and the magnetization directions of these PMs are adjacent and alternant in the horizontal direction. On the other hand, the secondary side is composed of a simple iron core with salient teeth so that it is very suitable for long stroke applications. However, the detent force of the C-core LFSPM machine is relatively high and the magnetic circuit is unbalanced due to the end effect. Thus, a new multiple additional tooth which consists of an active and a traditional passive additional tooth, is employed at each end side of the primary in this paper, so that the asymmetry due to end effect can be depressed and the detent force can be reduced by adjusting the passive additional tooth position. By using the finite element method, the characteristics and performances of the proposed machine are analyzed and verified.

“…In particular, after hybrid excitation flux-switching machines were proposed, the flux linked in the armature windings per phase can be increased or reduced according to the operational status requests, which makes the magnetic field easily adjusted [11][12][13]. The fault-tolerant capability of FSPM machines has also been a hot topic in recent years, FSPM machines with fault-tolerant capability can continue to operate under open circuit and short circuit fault conditions [14][15][16][17]. To sum up, because of the FSPM machine's simple structure, good controllability, high power density and fault-tolerant performance, it is a good selection for driving EVs.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Rotor Teeth Shapes on the Performance of Flux Switching Permanent Magnet Machines Used for Electric Vehicles

Zhao

Yan

et al. 2014

This paper investigated a 12-slot/11-pole flux switching permanent magnet (FSPM) machine used for electric vehicles (EVs). Five novel rotor teeth shapes are proposed and researched to reduce the cogging torque and torque ripple of the FSPM machine. These rotor teeth shapes are notched teeth, stepped teeth, eccentric teeth, combination of notched and stepped teeth, and combination of notched and eccentric teeth. They are applied on the rotor and optimized, respectively. The influences of different rotor teeth shapes on cogging torque, torque ripple and electromagnetic torque are analyzed by the 2-D finite-element method (FEM). Then, the performance of FSPMs with different rotor teeth shapes are compared and evaluated comprehensively from the points of view of cogging torque, torque ripple, electromagnetic torque, flux linkage, back electromotive force (EMF), and so on. The results show that the presented rotor teeth shapes, especially the combination of stepped and notched teeth, can greatly reduce the cogging torque and torque ripple with only slight changes in the average electromagnetic torque.