The design of flux barrier for improvement of demagnetization endurance in BLDC Motor

Generally, the motor inside vehicle is exposed to highly ambient temperature and large vibration according to repeatedly starting and stopping during very short time. So, in this paper, the rotor shape design was performed to improve demagnetization endurance by considering the starting current of the Brushless DC (BLDC) Motor through the Finite Element Method(FEM). As a result, the end of Permanent Magnets (PMs) in the basic model was occurring a partial irreversible demagnetization by starting current. To solve this problem, the installing flux barriers were limited to flux line on the core. Accordingly, demagnetization endurance and operating characteristics were improved.