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A closer look at the no-load current

Publication date: 
May 2001
Cyndi Nyberg Esau, Former EASA Technical Support Specialist
Type of media: 

Typically, motor currents of interest are the no-load current, full load current, service factor current, and starting (or in-rush) current. You will know the full load current from the nameplate, and you can calculate the starting current from the Code Letter on the nameplate. Service factor current may or may not be on the nameplate. The no-load current will not be shown on the nameplate. It is possible to obtain the value from the manufacturer, but not always. The no-load current is an important benchmark, and once it is established, you can estimate the load on the motor at any time.