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RATINGS OF 3•PHASE INDUCTION MOTORS

23. RATINGS OF 3·PHASE INDUCTION MOTORS

  • Three-phase induction motors are rated in terms of the following:

(i)                        Power output in kW ;

(ii)                     Speed;

(iii)                   Voltage;

(iv)                   Frequency;

(v)                      Phase (single or three)

(vi)                   Line current;

(vii)                 Temperature rise in specified time.

-        If a motor is designed to be operated on more than one voltage or at more than one speed by reconnecting the winding, a connection diagram is also given on the name plate.

-        Class of motors A, B, C, D, E or F is also to be mentioned on the name plate.

  • Standard types of squirrel cage motors are:

-        Class A motors-Low-impedance squirrel cage rotor motors.

-        Class B motors-High-reactance squirrel cage rotor motors,

-        Class C motors-High starting torque, low starting current-double squirrel cage motors.

-        Class D motors-High resistance squirrel cage rotor motors.

-        Class E motors.

Class F motors.