| Author Name | Affiliation | | Guangjing Su | School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China | | Hongmei Li | School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China | | Ying Dai | School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China | | Zheng Li | School of Electrical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China |
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| Abstract: |
| The stator flux and electromagnetic torque observation is the basis of direct torque controlled permanent magnet synchronous motor (PMSM) drive system. However, the traditional stator flux observer based on voltage model is affected by integral initial values and integral drift, that based on current model is affected by the parameters of PMSM, so a new stator flux observation method is proposed based on an improved second-order generalized integrator (SOGI). Compared to the stator flux observation method based on the conventional SOGI, the proposed method can not only overcome the influence of integral initial values and integral drift, but also completely eliminate the DC offset’s influence. Therefore, the observation accuracy of stator flux is further improved. The simulation and experimental results both show that the proposed method has a higher stator flux and electromagnetic torque observation precision. |
| Key words: permanent magnet synchronous motor direct torque control second-order generalized integrator stator flux observation electromagnetic torque observation |
| DOI：10.11916/j.issn.1005-9113.2016.06.013 |
| Clc Number:TM341 |
| Fund: |
