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How to Size an Electric Motor (or Replace)

To Replace Existing Motor –

 

          Please provide image of the name plate of the existing motor. 

We usually can make an offer based on this information. 

We may have to ask for additional details.

 

 

 

To Size a New Motor –

 

1.  What is a brief description of how the motor will be used?

 

 

2.  How many motors are needed?

 

 

3.  What is the motor RPM needed?

 

 

4.  What is the motor Torque needed?

 

 

5.  What is the power supply available?

          Provide: Volts, Hertz and Phase or VDC Voltage

 

 

6.  What is the NEMA frame size? (National Electrical Manufacturers Association)

          Determines the configuration for mounting the motor to the equipment

          Specifies the shaft and bolt pattern and other details

NEMA Frame Size Reference Table

 

 

7.  What is the NEMA Classification for the motor?

 

TENV  Totally Enclosed Non Ventilated

ODP    Open Drip Proof

TEFC   Totally Enclosed Fan Cooled

Etc.

 

See NEMA Electric Motor Type Reference

 

 

8.  What is the required IP (Ingress Protection) or NEMA Enclosure for the Motor?

Ingress Protection (IP) Rating Reference Chart

          or

NEMA Enclosure Reference Chart

 

9.  Is the motor to be Explosion Proof? What is the NEMA (US) or ATEX (Europe) rating?

          ATEX: Rating

          or

NEC: Explosion Proof Ratings: Class, Division and Group

 

 

10.  What is the temperature range that the motor will be operating in?

 

 

11.  Where are the motors needed so we can offer shipping costs?

    

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