| Title |
Cogging Torque and Acoustic Noise Reduction in High Torque BLDC Motors by Teeth Pairings |
| Authors |
이상민(Lee, Sang-Min) ; 황상문(Hwang, Sang-Mun) |
| Keywords |
코깅 토크 ; 영구자석 브러쉬레스 직류 전동기 ; 고정자 잇날 페어링 Cogging Torque ; Permanent Magnet Brushless DC Motor ; Stator Teeth Pairing |
| Abstract |
This paper investigates reduction of acoustic noise and cogging torque in a BLDC motor with larger stator slot open width. Using energy method, cogging torque is analytically determined with airgap MMF function and airgap permeance function and confirmed by FEM analysis. It shows that the cogging torque is firstly governed by NL GNL BNL with the fundamental period of NL, where NL is the least common multiple of the number of slots and the number of poles, GNL, airgap permeance function and BNL, airgap MMF function. It also shows that there exist several tooth width which minimizes the cogging torque, for the motors that smaller slot open width or stator teeth notching is not available. And it proposes a teeth pairing with two different tooth width which can effectively eliminate the cogging torque and thus the acoustic noise. Experimental results show that the proposed teeth pairing reduces the cogging torque by 85% and the acoustic noise by 3.1dB. |