| 摘要 |
A brake 8 has a brake coil 14 which is deenergized to generate a braking force so as to brake an elevator cage 17, and is energized in response to a start command signal to release the braking force. To coordinate brake and motor operation, current sensing means 21 sense a change in current of said brake coil as based on a change in an inductance thereof after the current has reached a predetermined value, and deliver an actuating signal, when the braking force of said brake is released, to a drive circuit 5 which, when supplied with the actuating signal, feeds electric power to a motor 2 for driving the elevator cage 17. The actuating signal can be used to lower the voltage applied to the brake coil when the braking force of the brake is released (Figs 5 and 8). A fault finding circuit is actuated when a detection signal (6, Fig 2) indicating release of the brake is not obtained on lapse of a time delay provided by a counter (30). <IMAGE> |
