A STUDY ON THE SPEED CONTROL OF A BLAC MOTOR BY BACK-EMF FEEDFORWARD COMPENSATION
Journal Title: International Journal of Electrical and Electronics Engineering Research (IJEEER) - Year 2017, Vol 7, Issue 1
Abstract
A PI controller is used to control the speed of a motor, but the gain of the PI controller is limited according to the system. Thus, the PI controller alone cannot meet the control performance requirements of the motor. A method involving back-electromotive force (back-EMF) compensation can solve this problem. Here, a feedforward compensation method based on the speed is used to compensate for the back-EMF. However, it is difficult to measure speed in the extremely low speed range, so it is difficult to compensate the back-EMF. In addition, the rate of the back-EMF compensation is modified by adjusting the gain. This proposed method of the back-EMF compensation is proven by simulation and experiment. The root mean square (RMS) value for the speed error is measured when the back-EMF is compensated for, when the back-EMF is not compensated for and when the gain of the back-EMF compensation is adjusted. The study confirms that the proposed algorithm is superior in the RMS value of the speed error.
Authors and Affiliations
DONGHOON BAN, JAESEUNG HONG, SUNGHO JIN, SEONGHUN LEE
Keywords
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- EP ID EP221697
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