Research on a direct torque control for an electrically excited synchronous motor drive with low ripple in flux and torque |
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Authors: | Zhou Yangzhong Hu Yuwen Huang Wenxin and Zhong Tianyun |
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Affiliation: | (1) Department of Electrical Engineering, Huaiying Institute, Huai’an, 223001, China |
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Abstract: | The electrically excited synchronous motor (ESM) has typically small synchronous inductance values and quite low transient
values because of the damper windings mounted on the rotor. Therefore, the torque and stator flux linkage ripples are high
in the direct torque control (DTC) drive of the ESM with a torque and flux linkage hysteresis controller (basic DTC). A DTC
scheme with space vector modulation (SVM) for the ESM was investigated in this paper. It is based on the compensation of the
stator flux linkage vector error using the space vector modulation in order to decrease the torque and flux linkage ripples
and produce fixed switching frequency under the principle that the torque is controlled by the torque angle in the ESM. Compared
with the basic DTC, the results of the simulation and experiment show that the torque and flux linkage ripples are reduced,
the maximum current value is decreased during the startup, and the current distortion is much smaller in the steady-state
under the SVM-DTC. The field-weakening control is incorporated with the SVM-DTC successfully.
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Translated from Proceedings of the Chinese Society for Electrical Engineering, 2006, 26(7): 152–157 译自: 中国电机工程学报] |
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Keywords: | synchronous machines electrically excited synchronous motor direct torque control space vector modulation field weakening |
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