Motor Technical Data
- MENZEL motor type: Three-phase squirrel cage motor MEBKSL630-14
- Application: pump
- Motor standard: IEC / EN 60034-1
- Rated power: 1,100 kW
- Rated voltage: 4,160 V
- Rated frequency: 60 Hz
- Number of poles: 14 poles
- Rated speed: 509 min-1
- Type of construction: IM 3011 (IM V1)
- Frame size / Shaft height: 630 mm
- Protection class: IP 55
- Cooling type: IC 611 (TEAAC - Totally-enclosed air-air-cooled Type)
- Weight: 12,000 kg
High Down-Thrust Forces: Bearing Challenge
The pump in Santo Domingo has no independent support bearing. Instead, the entire pump hangs from the upper support bearing. The motor must carry the full weight of the pump rotor in addition to the rotor itself. This results in exceptionally high down-thrust forces.
Our solution:
- Top bearing oil-lubricated (sump oil) for increased load capacity
- Reinforced B-side bearing housing
- Additional water cooling for the top bearing
These measures ensure the motor bearing can safely carry the full weight of the pump over long-term operation.
There are also applications in which the pump has its own support bearing. In this case, these measures are not necessary with an oil-lubricated bearing, as only the motor rotor needs to be carried, not the weight of the pump.
Axial Load vs. Down-Thrust Force: Technical Distinction
Axial load refers to any force acting along the rotational or shaft axis, regardless of direction. A down-thrust force is a specific type of axial load acting downward, for example when the top bearing of a pump supports the rotor’s weight. In short: every down-thrust force is an axial load, but not every axial load is a down-thrust force.
Dual Bearing System with Oil and Grease Lubrication
- Grease-lubricated bearing: for standard operating loads
- Oil-lubricated bearing: supports additional pump weight
- Oil level and temperature monitoring: essential for operational safety
Monitoring for Maximum Operational Safety
- PT100 sensors in windings and bearings allow continuous temperature monitoring.
- Exceeding predefined limits triggers automatic motor shutdown.
- Result: higher system availability and protection against damage.
Custom Flange Design
The customer requested that the pump shaft not exit directly below the motor. Instead our engineers configured a special pump connection flange, with recesses through which the condition of the coupling can be checked at any time.
Facing similar motor challenges? Send us your enquiry!
Why the Customer Chose MENZEL
- Technical interchangeability: Motor integrates seamlessly into the pump system.
- Streamlined project execution: Fast proposal process and flexible customization.
- Proven expertise with high-axial-load motors: Ensuring reliable operation under challenging conditions.
Tailored Solution for Extreme Requirements
This case study demonstrates how MENZEL Elektromotoren meets the most demanding customer requirements with technical know-how and practical engineering solutions.
The MEBKSL630-14 motor is now in service in Santo Domingo, reliably pumping water despite high down-thrust forces, complex bearing requirements, and custom flange design.
If you face similar challenges, contact us. We can engineer the perfect custom solution for your application.
