Electrical Engineering ⇒ Topic : Starting of Squirrel Cage Motors

Squirrel-Cage Motors :

• Stator rheostate starter.
• Auto-transformers (auto-starters).
• Star-delta starter

Slip Ring Motors :

(1) Rotor rheostat

 Squirrel-Cage Motors.

(1) stator rheostate Starter. The connection diagram is shown in Fig.(a)

                                                                      Fig. (a) Stator rheostat starter.

Reduced voltage is impressed on each stator phase due to the resistance R of the rheostat.Hence the initial current drawn from the supply mains will be less than if the machine were to be switched directly on to the supply mains.

If x = fraction of -voltage (V) reduced by the stator resistors

This method is suitable for starting of small machines only.