Investigation of Electromagnetic, Thermal and Mechanical Characteristics of a Five-Phase Dual-Rotor Permanent-Magnet Synchronous Motor

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.

Analytical Calculation of D- and Q-axis Inductance for Interior Permanent Magnet Motors Based on Winding Function Theory

“…As a typical topology of PM motors, the interior permanent magnet (IPM) motors with a V-shape provide a more superior performance of the flux-weakening capability and wider constant-power speed range [7][8][9][10], achieving considerable attention. Along with these excellent advantages, IPM motors offer a great alternative opportunity to contribute for a more rational use of energy, which makes EVs have the potential to provide a perfect solution to energy security and environmental impacts in the future [11,12].…”

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

“…Losses are generated during these processes, including resistance or copper losses, core losses, mechanical losses, and additional losses [10]. In the forward problem that occurs in an EM, these losses should be reduced to improve energy-conversion efficiency, because all losses are converted into thermal energy, which increases the temperature of an EM and affects its performance [11]. Thinking inversely, however, we attempt to enhance losses in an EM to enable the EM convert all the input energy into thermal energy without producing mechanical or electric energy.…”

The Optimization Design of Short-Term High-Overload Permanent Magnet Motors Considering the Nonlinear Saturation

“…Alternatively, the performance and lifetime of the motor are affected by the temperature. Permanent magnet synchronous motors are the first choice due to their simple structure, high torque density, and high power density [1][2][3][4][5][6][7]. The high dynamic response performance of the motor also means that the output torque can reach high value compared to rated torque in a short time.…”