| Title |
Enhancement of the Speed Response of PMSM Sensorless Control Using A New Adaptive Sliding Mode Observer |
| Authors |
김홍열(Kim, Hong-Ryel) ; 손주범(Son, Ju-Beom) ; 이장명(Lee, Jang-Myung) |
| Keywords |
Permanent Magnet Synchronous Motor ; Sliding Mode Control ; Adaptive Sliding Mode Observer ; Sensorless Control |
| Abstract |
This paper proposes an adaptive sliding mode observer (SMO), which adds the estimation function of the stator resistance to a new sliding mode observer for the robust sensorless control of permanent magnet synchronous motor (PMSM) with variable parameters. To reduce the chattering problem commonly found in the conventional sliding mode observer where the low-pass filter and additional position compensation of the rotor are used, the sigmoid function is used for the control of a switching function in this research. With the estimation of the stator resistance, the proposed observer can improve the control performance by reducing the estimation error of the motor's speed. Note that the stator resistance is varying with the ambient temperature and becomes an error source for the sensorless control of PMSM. The new sliding mode observer has better efficiency than the conventional adaptive sliding mode observer by reducing the time consuming integral calculations. The stability of the proposed adaptive sliding mode observer is verified by the Lyapunov function in determining the observer gains, and the effectiveness of the observer is demonstrated by simulations and experiments. |