| 摘要 |
PURPOSE:To unify loads on driving motors by detecting the load factor of each driving equipment, selecting a load factor to be based on from among the detected ones, and tuning the speed of each driving equipment based thereon. CONSTITUTION:Loads applied on motors Ma-Mn are detected using load detecting units 5a-5n, and load factors alpha1-alphan are calculated from the fluctuation of applied current, or load fluctuation. The calculated load factors are transmitted to the reference load factor computing means 7 in a speed commanding equipment 2. The reference load factor computing means 7 detects the load factor of each driving equipment 1a-1n, and takes an appropriate load factor (e.g. mean load factor) as a reference for tuning the speed of each driving equipment. The reference load factor is transmitted to a set speed commanding unit 8, which then sets a reference speed fs based thereon and transmits it to each driving equipment 1a-1n. In each driving equipment the speed commanding means of an inverter control unit 3a 3n sets an applied voltage to the speed reference fs, and each driving motor is thereby driven in tune. |
