| 摘要 |
<p>A direct current motor driving device for driving a direct current motor (2) having a plus terminal and a minus terminal, which comprises a direct current source (4) having a plus terminal and a minus terminal, the plus terminal being connected to the plus terminal of the direct current motor (2), pulse generating means (12) for generating a pulse signal when an input signal to an input terminal of the pulse generating means (12) exceeds a set threshold value, driving means (14) for driving the direct current motor (2) in response to the pulse signal outputted by the pulse generating means (12), and a first resistance type voltage dividing circuit (16) inserted between the minus terminal of the direct current source (4) and a minus terminal of the direct current motor (2) for providing as the input signal to the pulse generating means (12) a voltage signal produced by resistance-dividing a voltage between these terminals in a first ratio; whereby when a counter electromotive force generated by the direct current motor (2) by the rotation of the direct current motor (2)by an external force in a direction opposite to its driving rotational direction is added to a source voltage of the direct current source (4) to be supplied to the first resistance type voltage dividing means (16), the voltage signal of the first resistance type voltage dividing means (16) is increased to exceed the set threshold value of the pulse generating means (12), and the pulse signal is generated by the pulse generating means (12) to actuate the direct current motor (2). The direct current motor driving device enables direct current motors for general purposes to be actuated and stopped without the use of power switches. <IMAGE></p> |
