| 摘要 |
PURPOSE:To make a motor stoppable at a specified position without fail, by installing both of a signal comparator circuit out of a control circuit for a shock absorber between a car body and an axle and a brake circuit in space between motors, while operating this brake circuit in time of a consistent signal out of the comparator circuit being outputted. CONSTITUTION:When a consistent signal out of a signal comparator circuit 3 is outputted, a base current in a transistor Tr28 comes to a high level, turning on this transistor, so that the current of a transistor Tr30 runs into the transistor Tr28 and grounded, thus turning off the Tr30. Therefore, a driving current out of a power source part 26 is intercepted by the Tr30 whereby power feed to a motor 4 comes to a stop. However, as inertia force exists in a driving shaft 4a, there is produced electromotive force because the motor 4 rotates with the inertia force. At this time, there is a diode 25a provided with a brake circuit 25 between the motor 4 and the Tr28 whereby the generated electromotive force flows into a grounding terminal 32 via the diode 25a and consumed into nothing, giving the motor 4 the braking force. As a result, the moment the consistent signal is outputted from the comparator circuit 3, the motor 4 can be stopped at the specified rotating angle position. |
