Ratings of 3-Phase Induction Motors

It is important to rate three phase induction motors to monitor the performance of the same in the industrial need. Mentioned below are some factors that are helpful in rating the induction motors:

  • Unit or three phases
  • The flow of power output in KW
  • Speed
  • Voltage
  • Frequency
  • Current line
  • Rising of the temperature at a particular duration of time

Please note that the connection diagram is always mentioned on the name plate with the class of motors (A, B, C, D, E or F) under the following conditions:

If the induction motor is assigned the operation on more than single voltage


More than a single speed with the help of winding reconnection

Types of standard squirrel cage motors:

Following are the types of squirrel cage motors under the standard platform:

  • Low-Impedance Squirrel rotor motors considered in Class A motors
  • High-reactance squirrel cage rotor motors considered as Class B motors
  • Under high staring torque followed by low starting current and double squirrel cage motors are considered under Class C motors
  • High resistance maintained by squirrel cage rotor motors are featured under Class D motors
  • which is followed by two other classes called: Class E and Class F motors


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