| 摘要 |
PURPOSE:To suppress generation of vibration in a drive pulley by performing a frequency control in a manner wherein attractive force of a linear induction motor is in a minimum or repulsive force at the time of starting acceleration and regenerative braking, in the case of a device in which the wire rope driving pulley is turned by the linear induction motor. CONSTITUTION:A ring-shaped secondary side reaction plate 3, consisting of non-magnetic good conductor of aluminum or the like, is arranged in the peripheral direction in the peripheral part end face of a drive pulley 1 rotatably supported to a rotary supporting shaft 2, and a plurality of sets of linear primary side stators 4 (4a to 4d) of a linear induction motor(LIM) are arranged in the peripheral direction, so as to be opposed to this plate 3 and its both end surfaces with a fixed gap held, and fixedly supported respectively by a supporting mechanism. By energizing the primary side of the motor LIM with an AC power supply of variable voltage/frequency, the drive pulley 1 is turned. Here a voltage/frequency control and a slip frequency control are performed so as to obtain minimum or repulsive attracting force of the motor LIM at the time of starting acceleration and regenerative braking. |
