| Title |
Effect of Rotor Design Modification on Noise in a Permanent Magnet Synchronous Motor |
| Authors |
Changhwan Kim ; Yongha Choo ; Cheewoo Lee |
| DOI |
http://doi.org/10.5207/JIEIE.2021.35.2.022 |
| Keywords |
Noise; PMSM; Radial Force; Sound Pressure Level; Vibration |
| Abstract |
This paper analyses the electromagnetic causes of noise in a permanent magnet synchronous motor (PMSM) in terms of its rotor design modification. Electromagnetic vibration and/or noise in the PMSM is significantly affected by radial force. The change of radial force by adding three different sets of slits in a rotor is investigated along with switching frequencies from 2kHz up to 6kHz at the intervals of 1kHz. The variation of radial force is correlation with noise as sound pressure level (SPL) obtained through finite element analysis (FEA). The location of slits is the minor design modification of the rotor, but it changes the path of magnetic flux and radial force at the same time. These electromagnetic performances lead to the change of mechanical characteristics such as displacement and sound pressure level. In this research, it is noted that it is critical to select the location of small holes in a rotor since it affects the performance of vibration and/or noise. As a result, cautious trade-off between torque and noise performances has to be considered during the modification of motor lamination. |