| 摘要 |
PURPOSE:To normally compensate the commutation at normal/reverse operating time by providing a detecting brush for detecting a voltage between brush commutator segments near the exit of the brush, and controlling the current amount of an auxiliary winding in response to the detected voltage of the positive or negative brush of the brushes. CONSTITUTION:Positive and negative brushes 13A, 13B for detecting the voltage between brush commutator segments are provided near the outlet of a brush 11, and the detected voltages of the positive and negative brushes 13A, 13B are applied to function generators 16A, 16B. A rotating direction discriminator 19 inputs a signal from a rotating speed detector 18 and applies rotating direction signals (a), (b) to a power amplifier 10 and switches 17A, 17B. A power converter 20 controls the current of an auxiliary winding 10 in response to the outputs of function generators 16A, 16B by the switches 17A, 17B and rotating direction signals (a), (b). |
