COMMINUTING DEVICE INCLUDING A ROTARY CURRENT ASYNCHRONOUS MOTOR AND A NON-POSITIVE TRACTION DRIVE AND METHOD FOR ITS OPERATION

摘要

The invention relates to a method for operating a comminuting device, in which method a comminuting rotor is driven by a driving unit which at least comprises a rotary current electric motor, via a non-positive traction drive, particularly a belt drive, wherein said rotary current electric motor is energized by a controlled frequency converter, for operating the comminuting rotor at a predetermined rotational speed during the normal operating phase, and wherein a degree of slip of the traction drive is determined and monitored and the rotary current electric motor is controlled for being powered off if a first slip threshold value is exceeded. The method of the invention is characterized in that if a predetermined second threshold of the traction drive slip is exceeded, which is below said first slip threshold, for continuing the operation of the comminuting device, said frequency converter is controlled in a slip operating phase for a closed or open loop control of the traction drive slip to a predetermined third slip threshold value and for reducing the torque output from the rotary current electric motor. The invention also relates to a comminuting device for carrying out the method.

主权项

1. A method for operating a comminuting device, in which method a comminuting rotor is driven by a driving unit which comprises at least a rotary current electric motor, via a non-positive traction drive, particularly a belt drive), wherein said electric motor is energized by a controlled frequency converter, for operating said comminuting rotor at a predetermined rotational speed (ω0) during the normal operating phase, and wherein a degree of slip (S) of the traction drive is determined and monitored and the rotary current electric motor is controlled for being powered off if a first slip threshold value (S1) of the traction drive slip is exceeded, wherein if a predetermined second threshold (S2) of the traction drive slip is exceeded, which is below said first slip threshold (S1), said frequency converter is controlled in a slip operating phase for closed or open loop control of the traction drive slip (S) to a predetermined third slip threshold value (S3) and for reducing the torque (ME) output from the rotary current electric motor.