ANALYSIS OF THE EFFECT OF SLOT-OPENNING WIDTH AND MAGNET LENGTH ON THE COGGING TORQUE IN THE EXTERNAL ROTOR BLDC MOTOR USING IN MILITARY APPLICATION.
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Cogging torque; BLDC; Carter coefficient; Slot dimensions; Leakage flux model of stator teeth; Military application.Abstract
BLDC-Brushless Direct Current motors are more and more widely used thanks to the advantages of relatively simple structure, high efficiency, and good speed regulation. However, one of its disadvantages is that the cogging torque is high. Reducing the cogging torque is one of the aims of the BLDC motor design. In particular, in military applications, the cogging torque causes unwanted vibrations and noises. In this paper, the author analyzes factors which influence the cogging torque. Simulation results show the effect of teeth/groove and the size of the magnet on the cogging torque value. Thereby, the author gives a plan on the design of the stator groove opening and the magnet coverage to minimize the effect of this parameter on the quality of torque and the working characteristics of the motors.
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