Understanding Electric Motor Nameplates

Electrical Tech Note 103 Agricultural Engineering DepartmentMichigan State University Understanding Electric Motor Nameplates1 Understanding the information provided on an Electric Motor nameplate and how to use theinformation is important. It may be necessary to replace an Electric Motor in the future, andnameplate information in needed to make sure the replacement Motor is acceptable for theapplication. Nameplate information is provided in manufacturers catalogs, and selecting theright Motor for an application requires an Understanding of that information. The followingdiscussion explains information found on a typical Motor nameplate, and how that informationcan be used. Figure 1 shows a typical Motor nameplate. Some Motor Nameplates provideadditional information. Figure 1 Nameplate of a typical dual-voltage, 3-phase, squirrel cage The frame number is necessary to know when replacing a Motor , or ordering a motorfor an application.

Actual circuit voltages may be as high as 125 and 250. Having a circuit voltage a little higher than the motor voltage is usually not a problem. There are some motor and circuit voltage combinations which should be avoided. A motor nameplate with 200, 208, or 200-208 volts should not be operated on a 240 volts circuit unless specifically stated by

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