Prof. Myung-Seop Lim

Electrical Parameter Comparison of 8-pole 6-slot and 8-pole 12-slot using Equivalent Magnetic Circuit for Servo Motor
2020-08-09 18:46:59 조회수572
Date of Conference: 2020.07
Conference: 한국자기학회 하계학술대회
Authors: Jin-Cheol Park, Soo-Hwan Park, Sung-Woo Hwang, Seong-Ho Jung, Won-Gi Lee, Yun-Yong Choi, Myung-Seop Lim

Since environmental regulations have been strengthened recently, the mechanical component is being replaced by an electric motor in the industrial or automotive application. Among the electric motor types, the PMSM (Permanent Magnet Synchronous Motor) using permanent magnets is adopted owing to a high power density. The types of PMSM can be divided into IPMSM (Interior Permanent Magnet Synchronous Motor) and SPMSM (Surface-mounted Permanent Magnet Synchronous Motor) based on the location of the permanent magnet. The servo motor mainly uses SPMSM because it is relatively simple to control and easier to manufacture than IPMSM. In particular, it is important to select a combination of the pole and slot number for design SPMSM. The cogging torque, power density, and vibration performance are different depending on the combination of poles and slots. Therefore, it is necessary to study the motor performance according to the combination of the pole and slot number. This paper analyzes and compares the electrical parameters of 8-pole 6-slot and 12-slot motors. The electrical parameters are phase resistance, inductance, and back EMF. Also, the difference in parameters between 6-slot and 12-slot is analyzed using a magnetic equivalent circuit as shown in fig.1. As a result, the phase resistance and inductance of the 8-pole 12-slot are reduced compared to the 8-pole 6-slot under the same condition. Using inverter simulation for BLDC control as shown in fig.2, the torque-speed performance is confirmed from the voltage equation with the determined parameters. Therefore, it is verified that the power density of 8-pole 12-slot is higher than that of 8-pole 6-slot within the same size as shown in fig.3.

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