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Energy Efficient Motors

Most electric motors in pumping systems are oversized to allow for worst-case scenarios that rarely or never occur. Pump flow is typically regulated by a valve. Forcing the pumped medium through a constriction to achieve the correct flow rate increases friction, so energy is wasted.

Motors of pumps already installed

Energy efficiency is far more significant to the bottom line than the capital outlay to purchase a motor. For example, an 11 kW motor costing roughly €1,100 can consume more than €90,000 worth of electricity over a 10-year operating life. Many plant managers send a failed motor out to be rewound although this will reduce efficiency. One solution is to adopt a motor management policy giving clear guidelines on when to purchase high efficiency motors. As a rule, small motors and those with long running hours should be replaced. Large motors and ones that run only occasionally or have unusual frame sizes can be rewound, but there are also times when replacement of a fully functional motor can be justified on energy grounds alone.

Motors of new CP pumps

High efficiency motors are up to 3.5% more efficient than standard motors due to their design and the amount of active material (copper and iron) used. A high efficiency motor is more efficient across a wider load range than a standard model and loses far less efficiency over the speed range. Energy efficient motors also save on operating costs by providing better reliability than standard motors because less energy is converted into heat, keeping the temperature low inside the casing and thus reducing downtime and maintenance.

High efficiency motors will reduce your energy costs. That is why CP partners with various motor manufacturers to offer a wide choice of models, including efficiency class 1 motors (EFF1 or IE2) as standard for use in non-hazardous areas.

CP’s partners offer the following types of low voltage motors from 0.05 kW to 100 kW:

  • Motors for potentially explosive atmospheres (ATEX), all protection types
  • Standard motors in aluminium, steel and cast iron frames. Efficiency class 1 motors (EFF1 or IE2) are CP standard; IE3 is recommended.

CP will be happy to advise you in detail on how you can save energy with motors.

More Information

Energieeffiziente Motoren
CP’s energy efficient motors

ABB’s Energy Saving Tool
Compare the efficiencies of two motors and see what the savings are in practice.

ABB’s Operation Savings Analyzer
Estimate the savings that high efficiency motors can yield for a complete plant.

Siemens’ SinaSave Energy
Efficiency Tool

Calculate the cost savings potential and payback period for energy efficient motors.


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