Abstract
The fluctuations in both speed and torque magnitudes during operation are among the major disadvantages of brushless DC motors. These fluctuations occur due to both the commutation of the inverter switches and the phase winding inductances. This case can lead to major problems, especially in applications which are required constant speed and constant torque. In this work, it was aimed to reduce speed fluctuations that occur in brushless DC motors. Firstly, the Matlab/SIMULINK model was created by using the dynamic equations of the brushless DC motor. Secondly, a region selective circuit was designed for use in commutation times. Finally, the commutation signals were generated from the magnitude of the torque produced by the motor. Consequently, the proposed technique was controlled under different speed conditions and was shown that the speed fluctuations can be reduced without the difficult calculations of the commutation time. According to the results obtained, it was observed that the speed fluctuations were significantly reduced.
Highlights
IN RECENT YEARS, Brushless DC motor has started to be used frequently in many motion source applications
A new DC link voltage control strategy was proposed with the SEPIC converter to equalize the slopes of the incoming and outgoing phase currents during the commutation and adjust the desired DC link voltage in order to reduce the torque fluctuations at both low and high speeds [3]
In order to keep constant of the non-conducting phase current, a region selective circuit was designed with a new switching technique and applied to the BLDCM at the commutation time, both the commutation times were analyzed and the CUK converter was used to obtain the desired voltage value at the time of commutation [6]
Summary
IN RECENT YEARS, Brushless DC motor has started to be used frequently in many motion source applications. A new DC link voltage control strategy was proposed with the SEPIC converter to equalize the slopes of the incoming and outgoing phase currents during the commutation and adjust the desired DC link voltage in order to reduce the torque fluctuations at both low and high speeds [3]. In [9], a new current control method has been proposed in order to reduce the ripples in the conducting and commutation regions for Brushless DC motor with non-ideal back electromotive force (EMF). With this method, they were use both the calculation of the commutation times and the pulse width modulation (PWM) to disable the free-wheeling diode (FWD) in the inactive phase. When the results obtained were compared with the conventional BLDC speed control, it was observed that the fluctuations in the rotor speed were significantly suppressed
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