| 摘要 |
PURPOSE:To extend the speed control limits to permit a stable operation by connecting a frequency converter to between an AC power source terminal and an armature winding of a rotary electric machine. CONSTITUTION:External connecting terminals 5, 6 and 9 connecting to external connecting cables 11-13 are provided to an armature winding 2. The external connecting terminals 5, 6 and 9 are connected to an external power source terminal 14 through a frequency converter 15. On the other hand, the exciting power is provided to a stator exciting winding portion 7 not routed through the frequency converter 15. The exciting current to the exciting winding portion 7 is controlled by reverse-parallel circuits 19-21 of a rectifier with control elements, by which the rotating magnet field is provided reverse to the rotating direction of a rotor.
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