| 摘要 |
PURPOSE:To stably control a motor even at a light loading time by preventing an armature current from becoming zero at the time of driving the motor. CONSTITUTION:When an armature current flows normally in a motor 1, the output of a detecting resistor 15 is large, and the output of a current regulator 20 is zero. Accordingly, a voltage regulator 10 so controls the field current of an AC generator 14 as to supply a voltage set by a voltage setting unit 11 to the motor 1. When the load of the motor 1 becomes light so that the armature current becomes zero or in the vicinity of zero, the regulator 20 serves to apply a signal of the prescribed amplitude to the regulator 10. Thus, the output of the voltage regulator 10 is increased, the generated voltage of the generator 14 is raised, and the prescribed armature current is flowed through the motor 1. A regulator 16 can limit the maximum current of the motor 1. |
