Bespoke Pit Fan Motors With Fin Cooling
The manufacture is complex, but the result is optimal for the constricted installation conditions. To save additional space, all connection cables are routed out of the motors, and the terminal boxes are mounted outside the fans.
Since the driven fan wheels are mounted directly on the motor shafts, the motor bearing must compensate for additional high loads; radial loads up to 20700N and axial loads up to 27000N.
For the required bearing service life of 100,000 hours, Menzel implemented a special rolling bearing setup. In addition, the motors have a second shaft end for a holding brake. The three-phase squirrel cage motors are designed for operation on a frequency converter (duty type S9) with speed changes and reversal of the rotation direction. This allows the pit fans to ventilate the mine and extract dangerous firedamp if necessary.