Abstract
Today’s automotive industry has focused its studies on electric vehicles (EVs) or hybrid electric vehicles (HEVs) rather than gasoline-powered vehicles. For this reason, more investment has been made in electric motors with high efficiency, high torque density, and high-power factor to be used in both EVs and HEVs. In this study, an outer-rotor permanent-magnet-assisted synchronous reluctance motor (PMaSynRM) with a new rotor topology was designed for use in an EV. The design has a transversally laminated anisotropic (TLA) rotor structure. In addition, neodymium-iron-boron (NdFeB) magnets were used in rotor topology. The stator slots were designed as distributed windings, so torque ripples are minimized. At the same time, the maximum electromagnetic torque was achieved. The analysis of the designed motor was carried out using the finite element method (FEM). Optimal values of motor parameters were obtained by improving the rotor geometry of the three-phase PMaSynRM in order to obtain maximum torque and minimum torque ripple in the design. The motor is in a 48/8 slot/pole combination, a speed of 750 rpm and a power of 1 kW. The simulation results showed that the design achieved maximum torque and minimum torque ripple.
Highlights
With the decrease in fossil fuels in recent years, new alternative energy sources have been sought
PMs used in permanent magnet synchronous motors (PMSMs) are preferred due to their high energy density, but the cost of PMs has created a disadvantage [6]
PMaSynRM is obtained by placing PMs in the flux barriers in the rotor topology to improve the low power factor and increase the low torque density as well as efficiency [11]
Summary
With the decrease in fossil fuels in recent years, new alternative energy sources have been sought. Induction motors (IMs), brushless DC (BLDC) permanent magnet (PM) motors, surface mount permanent magnet motors (SPMs), interior permanent magnet motors (IPMs) and switched reluctance motors (SRMs) have been designed as in-wheel motors in both EVs and HEVs [4] Features sought in these motors include fast torque response and power density, wide speed range, high efficiency, high reliability, and low cost [5]. PMaSynRM is obtained by placing PMs in the flux barriers in the rotor topology to improve the low power factor and increase the low torque density as well as efficiency [11]. In [18], a new five-phase external rotor ferrite permanent magnet-assisted synchronous reluctance motor (Fe-PMaSynRM) with a high saliency ratio was designed. By performing the necessary magnetic analyzes, an efficiency of 91.30% was achieved
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