| 摘要 |
An apparatus for performing numerical control of a load at a high speed efficiently. The apparatus drives a linked load, as a DC motor, in the initial period of the movement of the load, and then, generates a braking torque to decelerate the load. In the final period of the movement of the load, the apparatus drives it, as a stepper motor, by electrical pulses of a predetermined number. Required numerical control of the load is thus performed. Also, in the case that current application to armature coils is interrupted when driving the foregoing motor, magnetic energies stored in the armature coils are not fed back regeneratively to the power source, blocked by diodes for preventing reverse currents, and consequently flow into capacitors of small capacitance values to change them. Thereby, the voltages of the capacitors are kept high, and the currents are reduced rapidly. After the lapse of a predetermined time, when the current application to the armature coils is resumed, the high voltages of the capacitors cause the currents to rise rapidly. Therefore, the reverse and reduction of the torque of the motor are prevented, and the load can be moved at a high speed efficiently. <IMAGE> |
