| 摘要 |
PURPOSE:To make it possible to provide a constant braking force irrespective of the speed of a direct current motor, by applying an inverse voltage to the direct current motor from an electrical power source for braking so that the braking is made. CONSTITUTION:Electrical power is supplied from a drive power source 32 to a direct current motor 25 for driving a slide table 23. Relays 33, 34 are reopened when a cam 26 engages with a limit switch 28 for closing a relay 37 so that the wiring of the direct current motor 25 is sitched. Therefore, the direct current motor 25 serves as a generator and at the same time, an electrical power source 36 for braking feeds an inverse voltage to the direct current motor 25 so that the direct current motor 25 is braked under a constant braking force in the same manner as upon deceleration. The inverse voltage is applied only in a predetermined time period from the electrical power source for braking upon deceleration. |
