The air pollution have become a major social problem. The motor is applied to the traction system. The traction motor operates in wide operation range. In this paper, 120kW Concentrated winding IPMSM is presented as existing model. In the high speed, harmonics of the motor becomes large, it becomes a problem in the control side. Therefore, when designing a vehicle electric motor, it is necessary to design motor in order to reduce no-load back electromotive force in coasting and harmonics in high speed. Through winding method and tendency of permanent magnet, we study improvement to satisfy constraints about the harmonics in the high speed and back electromotive force in coasting of existing model. We need to improve design to satisfy the output characteristic. We get the design parameters through tendency analysis. So we design the final model by using design parameters. Finally we verify final model's electromotive characteristics using FEM.