Abstract
The automobile industry is actively developing hybrid electric vehicle (HEV) or electric vehicle (EV) with electric motors to overcome the limitations of conventional internal combustion engine cars. This has the advantage of significantly improving the fuel economy of existing internal combustion engine cars, but it can be annoying to the driver by creating a whine noise in the new frequency range. This paper proposed a new design concept based on the electromagnetic shape optimization to improve the noise, vibration and harshness (NVH) performance. The new design was optimized using the response surface methodology (RSM). As a result, NVH have been improved dramatically as well as the motor efficiency with the virtual slot technology. The motor was prototyped and confirms the cogging torque reduction. Moreover, the whine noise level was satisfied beyond the goal. The design has been patented to obtain the technical excellence.
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