Title :
Torque ripple improvement for brushless DC miniature motors
Author :
Murai, Yoshihiro ; Kawase, Yoshihiro ; Ohashi, Kazuharu ; Nagatake, Kazuo ; Okuyama, Kyugo
Author_Institution :
Dept. of Electron. & Comput. Eng., Gifu Univ., Japan
Abstract :
An analytical investigation of the brushless DC miniature motor with permanent magnets is presented. Fundamental equations are derived, and the torque ripple is evaluated by utilizing the performance index, which is defined to be in proportion to the peak-to-peak pulsation of the motor velocity. The torque ripple arising from the flux distributions in a magnet is investigated, and the optimal distribution to minimize the torque ripple is presented. In order to develop a practical method of reducing the torque ripple, the overlapping method and the pulse-width modulation method are used, and the optimal values of the parameters are discussed
Keywords :
DC motors; permanent magnet motors; pulse width modulation; small electric machines; torque; PWM; brushless DC miniature motors; motor velocity; overlapping method; peak-to-peak pulsation; performance index; permanent magnets; torque ripple; Brushless DC motors; Brushless motors; DC motors; Equations; Magnetic analysis; Magnetic flux; Performance analysis; Permanent magnet motors; Space vector pulse width modulation; Torque;
Journal_Title :
Industry Applications, IEEE Transactions on
