| Title |
Back EMF Protection Circuit Design and Modeling Method of the PMSM of the Small Autonomous Underwater Vehicle by Underwater Discharge |
| Authors |
조원효(Won-hyo Cho) ; 이병국(Byoung Kuk Lee) |
| DOI |
https://doi.org/10.5370/KIEE.2022.71.5.715 |
| Keywords |
PMSM(Permanent Magnet Synchronous Motor); Autonomous Underwater Vehicle; Underwater Discharge; Back EMF; DB(Dynamic Brake); TSR(Tip Speed Ratio) |
| Abstract |
In this paper, we identify the electric power problem of the high-speed underwater discharge in a small autonomous underwater vehicle(AUV) and propose a circuit design method to protect it. High-speed underwater discharge of an AUV arouse propeller rotates due to the water flow. Excessive initial propeller rotation generates a back EMF of the motor and causes a voltage increase at the DC terminal of the inverter. To figure out this problem, a simulation was performed to limit the back EMF in a simplified environment. Then, a simulation-based controller protection circuit was proposed. Finally, the validity of the proposed simulation and the superiority of the protection circuit were confirmed through the actual underwater discharge test. |