Three tailored three-phase squirrel cage motors in frame size 630 for installation inside mining pit fans.
MENZEL Motors has just recently designed and manufactured three powerful 6,600V squirrel cage motors as integral components for mining pit fans.
The customer specified cylindrical motor casings as compact as possible for its underground ventilation system. The greatest challenge was to implement the required rated power of 1,700kW in cylindrical casings.
Menzel therefore designed TEFC fin-cooled squirrel cage motors (cooling type IC 411) in frame size 630, an extremely unusual design for motors this large.
The manufacture is complex, but the result is optimal for the constricted installation conditions in the mining industry.
In order to save additional space, all connection cables are routed out of the pit fan 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 additional high loads: radial loads up to 20,700N and axial loads up to 27,000N.
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 not only to ventilate the mine, but also to extract dangerous firedamp if necessary.
- Type: Squirrel cage motor MEBKSR630-06
- Standard: IEC/EN 60034-1
- Power rating: 1,700kW (corresponds to 2,280HP)
- Voltage rating: 6,600V
- Frequency: 37Hz
- Number of poles: 6 poles
- Nominal speed: 730min-1
- Rated torque: 22,240Nm
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