Specifying the right motor for your pump system is crucial for ensuring optimal reliability but with so many options beyond the applicable ratings, the task may seem overwhelming. If you keep in mind a few key things, you will open a discussion about selecting a motor that best fits your application.
1. Advanced engineering
Most applications now also utilise VFDs or drives to increase system energy efficiency so it is important to ensure that your motors are inverter-duty. Class H winding insulation is proven
to withstand demanding variable frequency driven applications. To avoid surprises, ensure the rated Reed Critical Frequency (RCF) is accurate within five per cent.
2. Cooling
Efficient cooling is essential for motor longevity and it is crucial to choose the correct totally enclosed or open frame for your application. Then, favour motors with innovative heat exchange designs to reduce the running temperatures of bearing and windings and enhance their overall reliability.
3. Rugged construction
Pump motors operate in some of the harshest conditions and motor frames for these extreme conditions are typically cast iron in construction. To further protect your equipment, ask for motors with a non-reversing ratchet – these assemblies will prevent fluid from reversing during a shut-off period, power loss or fault.
4. Thrust capability
The pump thrust load (from the pump manufacturer) will help you choose the motor with the correct thrust bearing. Large loads will require motor bearings rated for high or even super high thrust to withstand the stresses from differing load pressures while running.
Not all motors are built the same. When specifying a pump system, challenge your supplier to pay attention to those technical details that will eventually be critical to the future of your operations.
For more information, visit www.wolongamerica.com
