Abstract
This paper investigates of a kind of five-phase dual-rotor permanent-magnet synchronous motor (DRPMSM), which contains dual rotors and a single stator. This kind of motor has the potential advantages of high power density, high reliability and high efficiency, which make it more appropriate for using in electric vehicles (EVs). In order to evaluate the most suitable power level for this kind of structure, the electromagnetic, the thermal and the mechanical characteristics are investigated in this paper. The length to diameter ratio of motors is researched to obtain the highest power density and then the optimum ratio is obtained. Based on the optimum ratio, the thermal characteristics are researched under natural condition and forced-air cooling condition with different wind speeds. In addition, the mechanical characteristics are analyzed under no-load and different loads conditions, respectively. All of the results are analyzed by two-dimension (2-D) and three-dimension (3-D) finite element method (FEM) simulation, which provide a good reference to select suitable power level for this kind of motor structure. Finally, a DRPMSM prototype is manufactured and tested. The experimental results effectively verify the FEM results.
Highlights
With the requirements of energy conservation and emission reduction all over the world, governments and researchers have paid more attention to electric vehicles (EVs), which has been regarded as an ideal alternative of transportation [1,2,3,4]
The highest power density is achieved around the ratio of 0.4 and all power levels have the same variation as the ratio of k changes
Higher temperature is disadvantageous for Dual-Rotor Permanent-Magnet Synchronous Motor (DRPMSM) to run safely under natural condition
Summary
With the requirements of energy conservation and emission reduction all over the world, governments and researchers have paid more attention to electric vehicles (EVs), which has been regarded as an ideal alternative of transportation [1,2,3,4]. As the key part of EVs, the driving motor with higher power density, higher efficiency and higher stability is increasing required. Improving these properties has been a main research focus in EVs field nowadays. In order to improve the power density, a large number of researchers have paid more attention to special motors such as dual-stator permanent synchronous motor (DSPMSM) [7,8,9,10], dual-rotor permanent synchronous motor (DRPMSM) [11,12,13,14] and compound structure PMSM (CSPMSM) [15,16], which all contain double air gaps and can output more torque and power
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