| Title |
Active Short Circuit Control Method to Reduce Overcurrent and Oscillation Current in PMSM |
| Authors |
Jong-Won Choi ; Yoon-Jae Kim |
| DOI |
https://doi.org/10.6113/TKPE.2022.27.4.339 |
| Keywords |
ASC(Active Short Circuit); Functional safety; Safe state; Freewheeling; Traction inverter; Electric vehicle |
| Abstract |
This study proposes the mitigation method for overcurrent and oscillation motor current in an active short-circuit operation. This operation is attracting attention as the safe state of electric vehicle traction inverters. However, the active short-circuit operation generates oscillation and overcurrent of motor currents during a transient state. The proposed method uses two different safe states in PMSM, such as active short circuit and freewheeling. The active short circuit is used for safe state in a steady state. To reduce the overshoot and oscillation, a freewheeling state is injected between active short-circuit operation by comparing the motor phase current with an analytically calculated steady-state motor current. Freewheeling state is only used in a transient state. The performance is demonstrated through simulations and experimental results. The peak current of the motor was reduced from 52 A to 40 A, and oscillation time was reduced. |