Cons & Working principle of an alternator

At what part the voltage is generated?

• Armature winding

• Stator

• Rotor

• The slot

Why is AC generator normally made up of 3 phases?

• In order to function the alternator optimally

• In order to create a rotating magnetic field, else it wouldn't be able to.

• To increase the efficiency of the alternator

• Ppft, i don't know

Do you agree that a torque or EMF is generated from the Rotor? why?

• I do, since the rotor is the part that generates the main flux

• I do, well....you know, the rotor is the part where DC is converted into AC.

• Not exactly, since a rotor is inside the Stator, thus the stator should be the final output where EMF is generated

• Big no, it's obvious already.

What is the efficient rate (in RPM) of the rotor below to operate

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What is hysteresis?

• The concept where a system can work optimally

• The dependance of a system, where the way it works is based on the past only

• The dependence of a system, where the way it works is based on both presence and past state.

• The dependance of a system, where the way it works is based on current state

Based on your understanding, why is a cylindrical rotor type efficient to operate at higher rotation?

• Uniform air gap

• Flux distribution is a sin wave, better EMF waveform is obtained

• Reduced surface area, that'll minimize frictional drag at higher speed, a major distributor to energy loss.

• Stronger construction, provides greater mechanical strength

• Mass distribution, but gives higher torque / EMF

If I push the magnet to stand clear aside the coil, will an EMF appears?

Assume the coil isn't connected to the power supply!

• Absolutely

• Practically, it will be if it is connected

In a sync generator, what is the relationship between the number of poles (P), the rotation speed (Ns), and the frequency (f) of the generated AC output