Multi-Step Transmission Effect on Interior Permanent Magnet Synchronous Motor for Electric Vehicle due to Winding Connection Method

Recently, intransitive industrial research has gradually changed the main drive source as an electric motor from the engine due to environmental and resource exhaustion problems. It is very important to increase driving range per charge of electric vehicle. Expansion of the average high efficiency area of electric vehicle is more important than maximum efficiency point. Electric vehicle do not use mechanical transmission unlike a conventional combustion engine vehicle. Shifts are required to increase average efficiency. In this paper, we have studied the improvement of the average efficiency of the interior permanent magnet synchronous motor (IPMSM) for traction by applying the electromagnetic changeover of the stator winding such as method of the number of serial turns per a phase and wye-connection at low speed and delta-connection at high speed switching method and parallel branches conversion method through the finite element method.