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Excitation scheme of brushless self-excited-type three-phase synchronous machine

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2 Author(s)
Nonaka, S. ; Dept. of Electr. Eng., Kinki Univ., Fukuoka, Japan ; Kawaguchi, T.

AC excitation schemes of a brushless self-excited-type three-phase synchronous machine are presented. The rotor field windings of the machine are short circuited with the diodes, and an exciter or other exciting equipment is not required in this machine. On the positive-phase-sequence rotating field of the stator, the plural rotating fields with different speeds from it are superimposed by using a machine-side voltage source PWM inverter/converter, and the field MMF is obtained by half rectifying AC voltages induced in the rotor field windings. Two excitation schemes are proposed that have the advantage of the reduction of the torque pulsation as compared with the scheme that superimposes the singular rotating field with a different speed from the positive-phase-sequence field. This is confirmed by simulation, and experimental results are given

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Industry Applications, IEEE Transactions on  (Volume:28 ,  Issue: 6 )