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

Abstract

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

A Novel Electric Vehicle Powertrain System Supporting Multi-Path Power Flows: Its Architecture, Parameter Determination and System Simulation

“…Figure 8a that the vehicle velocity is greater than 80 km/h and the vehicle takes 6 s to accelerate from 110 to 120 km/h; during 6~12 s, the vehicle keeps driving at the speed of 120 km/h. As shown in Figure 8b, it can be found that every moment, 1 n , 2 n , and m n satisfy the constraint relationship in Equation (1).…”

“…Electric vehicles (EVs) have attracted increasing attention all over the world due to the serious concerns of the energy crisis and air pollution [1][2][3]. Generally, EVs can be classified into three types, namely, battery electric vehicles (BEVs), hybrid electric vehicles (HEVs), and fuel cell electric vehicles (FCEVs) [4,5].…”

“…The EM obtaining the energy from the battery propels the BEV through the transmission. However, there still exist the following shortcomings in the traditional BEVs: (1) Since the BEV is driven by the EM alone and it is also required to work in a wide range of velocities [6], it is bound to increase the maximum power and speed of the EM when we design or choose the EM, which will create difficulties in the design of the BEV; (2) it is rather obvious that there is only one power flow path. As far as regenerative braking is concerned, the instantaneous power from braking may cause potential damage to the batteries and reduce the battery life.…”

PWM Carrier Displacement in Multi-N-Phase Drives: An Additional Degree of Freedom to Reduce the DC-Link Stress

“…Although road electric vehicles primarily adopt three-phase drives, the multi-phase version could represent a good alternative not only for its integration capability but also for other features like reduced weight and volume, high efficiency, low vibrations and noise, robustness and, overall, fault tolerance [4][5][6].…”

Comparison of Optimized Control Strategies of a High-Speed Traction Machine with Five Phases and Bi-Harmonic Electromotive Force

“…For example, more possible winding configurations for low losses, high torque density and smooth torque ripples [13][14][15][16][17][18][19] can be analyzed. Likewise, as the freedom degrees number increases, the vector control gives more possibilities: the study of the current harmonic injection for higher torque density keeping a smooth torque [20][21][22][23][24][25][26]; the enlargement, for traction machines working in flux-weakening mode under voltage saturation [27][28][29][30][31], of the area of working. Finally, multi-leg Voltage Source Inverters (VSI) [32,33] present also numerous PWM(Pulse Width Modulation) control strategies.…”