I need this for my lab report.
Induction AC Motors are referred to as asynchronous motors or rotating transformers. This type of AC Motor uses electromagnetic induction to power the rotating device which is usually the shaft. The rotor in Induction AC Motor products typically turns slower than the frequency that is supplied to it. Induced current is what causes the magnetic field that envelops the rotor of these motors. This Induction AC Motor is designed in one or three phases.
Induction motors are cheaper to build and operate than dc motors and synchronous motors and for this reason are most common type of motor. In this motor there is no separate source of rotor excitation. It is called induction due to the fact that a stator which is energized from a balanced 3 phase source induces currents in the cylindrical rotor which in turn produces a torque that opposes the rotating magnetic field of the stator. The rotor does not rotate at synchronous speed, however. But rotates at a speed slightly less. The majority of induction motors have squirrel cage rotors. The induced voltage in the rotor will change with rotor speed. And the relative speed between the stator field and the actual speed at which the rotor turns it termed the slip speed. This slip speed characterizes the operating condition of an induction motor in much the same way that torque angle, δ for synchronous machines. The rated speed of an induction motor must only be a little below synchrounous speed. Note that the frequency of the supply voltage to the motor determines the synchronous speed of the apparent rotating stator magnetic field, while the induced rotor field rotates at slightly less than synchronous speed. Hope this helps somewhat.
What is the HP of the motors? The frequency of the generator should be marked on it. If not, use an oscilloscope to look at one of the output phases; carefully. The generator must be a 3 phase generator to run the 3 phase motors. There will be 3 hot wires, and a neutral and a ground. The neutral may be missing if this is a delta connection. edit: looking at your last question, it appears that this generator is actually an auto alternator, which will not generate any fixed frequency AC, and will not generate 230 volts. Certainly not 35000 watts! .
To know working principle of an induction motor you can go to the following link selectrical.blogspot.in/2014/02/working-principle-and-types-of.html
