How to Select a Three-Phase Motor for a Centrifugal Pump
Selecting a three-phase motor for a centrifugal pump begins with the pump duty point: required flow, total head, liquid and operating hours. The motor should be chosen from the pump shaft-power requirement after accounting for transmission efficiency and a realistic service margin; it should not be selected only from a nominal kW label.
Information to confirm
- Required flow rate and total dynamic head at the duty point
- Pump shaft power or performance curve, plus coupling or belt-drive efficiency
- Supply voltage, frequency and whether operation is 50 Hz, 60 Hz or inverter-driven
- Required running speed and corresponding pole count
- Installation arrangement, such as B3, B5 or B35, shaft and flange dimensions
- Liquid temperature, ambient temperature, altitude and ingress-protection requirements
How to narrow the specification
Start from the actual duty point, not the equipment name alone. Check the driven load, transmission losses, operating environment and installation constraints together. Keep the nameplate requirements, mounting dimensions and local electrical supply in the enquiry so the recommended configuration can be checked before order.
Request a technical quotation
Browse three-phase induction motors and include the pump curve, target flow/head and mounting drawing in your enquiry. For pump configuration, see our industrial water pump range.
For a preliminary recommendation, submit the operating conditions and any drawing or nameplate photo. Final selection must be confirmed against the complete application.