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Image: Learn how to select a motor

Should you replace a motor that is defective or at the end of its useful life with a NEMA PremiumTM motor?

Period during which a motor is deemed fit for its assigned purpose in normal operating conditions and in accordance with specifications.
 

The best time to purchase a NEMA PremiumTM motor is when you are building new facilities or when a motor needs to be replaced.

Choosing the best motor

Your choice of motor depends what features you are looking for (power, rpm, enclosure) and the motor load (constant or variable) required for the system of which it will be part.

  1. Optimizing system
  2. Selecting motor size
  3. Reducing or maintaining initial speed
  4. Increasing power factor

1. Optimizing system

Optimizing a system means achieving a motor's full electricity savings. This is essential when modernizing a system or designing a new one.

Do not: Design a system using a rule of thumb. A system designed using a rule of thumb generally requires twice as much power as an optimized system.

Visit the Empower Program for Industrial Systems Web site to find out more about recognized electricity management opportunities for:
Compressor systems
Ventilation systems
Pump systems
Refrigeration systems

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2. Selecting motor size

Optimal efficiency: 75–100% of motor load

Do not: Use an oversized motor, which operates with a load factor of 50% and entails a major loss in efficiency as well as high costs, especially in the case of motors 25 hp and under.

Ratio of mean power demand to maximum power demand in a given period.
 

Find out more about efficiency as a function of load

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3. Reducing or maintaining initial speed

Some NEMA PremiumTM motors have less slip. They therefore run at a slightly higher speed. This speed increase can negate the energy efficiency of the new motor.

Important: Always select a motor with an operating speed no greater than that of the motor being replaced.

How can you make it run at the same speed?

  • Trim the impeller
  • Change the sheave size

Find out more about motor slip

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4. Increasing power factor

Make sure that the power factor of the new motor, at the same load factor, is greater than that of the motor it is replacing.

When a motor operates near its rated load, the power factor is high, which is good. On the other hand, a lightly loaded motor has a lower power factor, and the demand charge is higher than the motor's real demand.

Find out more about power factor

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