| 摘要 |
In a self-exciting direct current motor of the type including amplifier means for amplifying a position signal produced by starting position detecting means and the electromotive force induced in an armature coil wound on a magnetic pole of the stator in accordance with the rotation of the rotor, and a self-exciting circuit for supplying the output of the amplifier means to the field coil wound on the magnetic pole of the rotor as a self-excitation field current, there are provided means for detecting only the forward rotation of the rotor, means for converting the output signal of the detecting means into a continuous signal, and means for supplying the continuous signal to the self-exciting circuit at the end of a predetermined period starting with a point of time at which the signal indicating the forward rotation is detected, thereby effecting the selective operation of the self-exciting circuit so as to amplify only the voltage induced in the armature coils.
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