Drive Power

Motor selection tips

One of the most important factors in motor selection is sizing. Undersized motors sometimes operate with overload conditions. That leads to increased downtime and reduced life expectancy. On the other hand, oversized motors contribute to reduced power factor and operate at reduced efficiency, which could add to your energy bill.

Totally enclosed fan-cooled motor rebates

We recommend that you always match motor ratings to your load requirements. Consider the actual load levels, both starting and running, and the expected duration of each load.

Rebate incentives and eligible technologies may change at any time. See page 3 for rebate details.

Open drip-proof motor rebates

Adjustable-speed drives (ASDs)

Induction motors are the workhorses of commercial enterprises and are used in virtually every manufacturing plant and office building. The largest energy savings in induction motor systems often lies not in the motor but in the controls governing the motor’s operation. ASDs improve drive system performance and efficiency.

An ASD can match the speed of an AC motor to the requirements of a fluctuating load, such as a pump that moves changing fluid volumes during production. When this happens, the control valves, dampers, or other throttling mechanisms can be removed (or locked in full open positions), dramatically improving energy efficiency and reducing energy expenses by up to 50 percent.

ASD rebates

■ Rebate of $60 per horsepower for process and other nonseasonal centrifugal applications.

■ Rebate of $40 per horsepower for seasonal and HVAC centrifugal applications.

Guidelines

■ Rebates cover ASD installation on motors from 1 to 500 horsepower operating under centrifugal loads.

■ Applications associated with motors exceeding 500 horsepower may qualify under our commercial and industrial grant program (see page 19). Contact one of our representatives for details.

■ System designer or installing contractor must ensure the entire facility complies with the IEEE Standard 519 after completion of the ASD installation or retrofit. Failure to comply with this rule in ASD installations may result in disqualification of any rebate request.

■ See rebate guidelines on page 3 for details.

Electronically commutated motors (ECMs)

An ECM uses 75 percent less energy than a standard fan motor.

ECM rebates

Rebates are available for customers that retrofit existing exhaust fans with an energy-efficient ECM. Rebate is based on motor horsepower.

Rebate incentives and eligible technologies may change at any time. See page 3 for rebate details.