| Title |
Output Characteristic Comparison of BLDC Motor for Water Circulation System According to Sensorless Control Methods |
| Authors |
김성안(Kim, Sung-An) ; 조윤현(Cho, Yun-Hyun) |
| DOI |
https://doi.org/10.5370/KIEE.2017.66.9.1325 |
| Keywords |
Blushless DC motor ; Six step control ; Twelve step control ; Zero crossing point ; Sensorless control |
| Abstract |
The sensorless control of blushless DC motor(BLDCM) is based on the 120° control in which the back electromotive force(Back EMF) for estimating the position of the rotor can be detected. However, the 120° control has a disadvantage that the torque constant is small as compared with 180° control which can not detect the back EMF. The 150° control which complements these problems makes it possible to detect the back EMF and improve the torque constant by 12.5% compared to the 120° control. Therefore, this paper compares the output characteristics of BLDCM through finite element method analysis (FEA) by the conventional and proposed control methods of BLDCM for water circulation system and proposes design for downsizing and weight reduction of BLDCM according to secured torque constant. The validity of the proposed control and design proposal is proved through simulation and experimental results by comparing the output characteristics of 120° control and 150° control. |