Abstract
On the basis of the excellent driving force demand of hybrid electric vehicles (HEVs), this paper studies the torque property of the compound-structure permanent-magnet motor (CSPM motor) used for HEVs, which is influenced by magnetic field oversaturation and variable nonlinear parameters. Firstly, the system configuration of HEVs based on CSPM motor and its working mode are introduced. Next, the state equation of CSPM motor in three-phase stationary coordinate system is proposed in order to investigate its torque performance; then, the factors affecting the output torque are gained. Finite element method (FEM)-based electromagnetic parameters analysis and design is carried out, to raise the output torque and reduce the torque ripple of CSPM motor. Besides, optimized design parameters are used to establish the FEM model, and the simulation results of electromagnetic performances for the CSPM motor before and after optimization are given to verify the rationality of optimization.
Highlights
At present, in the face of the global energy crisis and environmental pollution problems, hybrid electric vehicles (HEVs), as an environmentally friendly choice, have been developed rapidly.The HEVs use a dual-rotor motor as a power distribution device, together with an advanced control system, to make the two power units, i.e., the internal combustion engine (ICE) and battery cooperate to achieve low energy consumption and low pollution [1]
Power distribution devices mainly contain electric variable transmission (EVT), a compound-structure permanent-magnet motor (CSPM motor), a switched reluctance motor (SRM), magnetic-geared EVT, and the radial magnetic-field modulated brushless double-rotor machine (RMFM-BDRM), whose performances directly affect the quality of HEVs [2–6]
Is the voltage of three-phase stator winding and inner rotor winding; iA, iB, iC, iU, iV, iW is the is the self-inductance of each phase winding; MXY is the mutual inductance between different phase current of three-phase stator winding and inner rotor winding, and RA, RB, RC, RU, RV, RW is the windings; and EA, EB, EC, EU, EV, EW is the back EMF produced by the outside and the inside resistance of them; LXX is the self-inductance of each phase winding; MXY is the mutual inductance permanent magnet cutting the stator and inner rotor windings
Summary
In the face of the global energy crisis and environmental pollution problems, hybrid electric vehicles (HEVs), as an environmentally friendly choice, have been developed rapidly. The CSPM motor can achieve different energy flows in HEVs and transmit torque to drive the vehicle It has the problem of electromagnetic coupling, which affects the driving force and running stability. Energies 2018, 11, 2156; doi:10.3390/en11082156 www.mdpi.com/journal/energies magnet sizes, outer rotor yoke thicknesses, stator winding armature reaction, and material utilization ratios; (3) studying the different topology schemes of the CSPM motor, the electromagnetic coupling degree, torque density and heat dissipation are compared to meet the different requirements in the hybrid power system; (4) establishing the magnetic network calculation model, Energies 2018, 11, 2156 together with the Matlab software to analyze the parameters of CSPM motor.
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