| 摘要 |
PURPOSE:To enable stably constant speed control of a DC motor at set number of revolution per unit time by arbitrarily altering the set rotating speed value of the motor widely and retaining it at set rotating speed regardless of the load and power voltage variations. CONSTITUTION:There is provided a current setting means C connected to an external control mechanism in a circuit for applying the terminal voltage variations of a constant voltage DC motor M to the bases of transistors 1 and 2 forming a differential amplifier in a control circuit A. This control circuit A controls the base current of an output transistor 9 in response to the voltage applied to the base of the transistor 2 to thereby control the current flowing through the motor M.
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