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Rotor Field Oriented Instantaneous Torque Control Technology of Brushless DC Motor Based on Per-Phase Rotating Coordinate Transformation |
Li Zhenguo, Wang Penglei, Sun Qihang, Jia Yicheng |
Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province Yanshan University Qinhuangdao 066004 China |
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Abstract The equivalent model of a brushless DC motor (BLDCM) with the rotor field orientation has the characteristics that the d-axis rotor flux linkage is constant and the q-axis rotor flux linkage is zero. It isa favorable condition for building high-performance torque control systems. However, the traditional equal-power 3s/2r coordinate transformation cannot obtain the equivalent model of the rotor field orientation of BLDCM. Therefore, a rotor field orientation method based on per-phase coordinate transformation is proposed. That is, per-phase is transformed one by one to obtain the rotor field orientation equivalent model of per-phase winding, and then the three-phase is synthesized based on the principle of power conservation. Since the torque of the equivalent model is proportional to the q-axis current and independent of the d-axis current, the relationship between the d-axis armature reactive magnetomotiveforce, torque and the d- and q-axis currents is derived. Consequently, a BLDCM torque control system with non-magnetization/demagnetization is constructed. Finally, the feasibility and effectiveness of the proposed control technology are verified by Matlab simulation and DSP driving experiment.
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Received: 23 September 2021
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