Design and Construction of a Induction (Classic Reprint)

The object of this work is to design a Boucherot rotor to be used in a 10 HP, G.E. 25 Cycle, 80 Volt, 4P ole, 2-3 Phase Induction Motor. The only difference between a Boucherot Induction Motor and the ordinary squirrel cage type is in the rotor. Instead of having one squirrel cage, the Boucherot Motor has t?;o or more placed one inside the other. The object of the two squirrel cages is to give the rotor a better starting torque with less current consumption and also to give a better running characteristic. FIGURE I. shows the method of placing the two sets of windings. The outer winding has a high resistance and relatively low inductance. The inner winding has a low resistance and high inductance due to the greater leakage surface. At the start the frequency of the flux in the rotor equals the stator frequency, hence the high inductance cage will carry practically no corrent. The outer winding or low inductance winding will furnish the torque, and since the resistance of this winding is high and practically equal to the reactance, we will get maxiimua torque at the start. Under running conditions the frequency of the flux in the rotor will be proportional to the slip and since the slip is snaall the frequency will be sinall and the reactance of the inner winding will be small.
(Typographical errors above are due to OCR software and don't occur in the book.)

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