| 摘要 |
PURPOSE:To obtain stable rotating performance by immediately shifting to the prescribed rotation when the rotating speed of a motor is switched from high to low speeds by using as a braking method a reverse brake. CONSTITUTION:The voltage levels of the first and second rotating direction command signals 11, 12 are set so that a motor rotates in a direction designated by a rotating direction set signal 5 on the basis of the rotating direction set signal 10, a control signal 8 and a rotating direction detector signal 10 when the rotating speed of the motor is a reference speed or lower. The voltage levels of the first and second signals 11, 12 are set so that the motor rotates in reverse direction to the rotating direction of the motor detected by the signal 10 when the rotating speed of the motor is the reference speed or higher. Thus, the rotating speed can be immediately switched. |
