| 摘要 |
PURPOSE:To work a device exactly and stably and lengthen the span of life, by turning a driving circuit ON/OFF automatically owing to the forced rotation and forced stopping of a motor. CONSTITUTION:A controlling circuit for a DC motor is, for example, combined with a battery car for a toy, and a motor M is formed with a DC three-pole type commutator motor. So far as this circuit is concerned, four driving transisters(Tr)Q12-Q42 are bridge-connected and to a space between the two bridging points A, B, the motor M is connected. When the Tr Q12, Q32 of a side confronted with a bridge are ON, then positive voltage E is applied between terminals T1, T2, and a device is forwardly rotated. When the Tr Q22, Q42 of the other confronted side are ON, than the device is reversely rotated. Besides, the rotation detecting Tr Q11, Q21 of the motor M are arranged. In this case, every time the Tr Q11(Q21)is momentarily turned OFF, induced electromotive voltage along with the rotation of the motor M is detected, and the device is driven. When the motor M is constrained, then the Tr Q11(Q21)is once turned OFF and cannot be turned ON again, and the driving Tr Q12-42 are also intermittently turned OFF.
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