As far as I know the magnetic force is responsible for the motor rotation. So, horsepower of the motor is mostly related to magnetic flux on the coils (windings). Also magnetic flux is directly related to inductance (Number of turns) and the current flow on the coil. Am I right so far?
This is a simple illustration of a 3 phase induction motor:
In the center of the stator, there is the rotator (not shown in the picture). And here is the equivalent circuit of the induction motor:
And here are the things that I do not understand:
1- What is magnetizing reactance of the winding? I've read a few explanations about it but really I could not understand. Isn't it normal for reactance to have magnetic property? Could you explain me this property in detail?
XM is the magnetizing reactance of the winding.
2- Why do we want high power factor?
Should not we want just the opposite? Because we only care about the current flow on the windings? Power factor of an inductor is related to serial resistance and inductance value of its equivalent circuit. If we draw the same amount of current on two inductor which have different serial resistor values, the one with the lower power factor will consume less energy but the amount of the magnetic flux will be same. Right?
So, does power factor mean something else for motors, or did I understand the concept wrong here?
3- How can I calculate the horsepower and the efficiency of my motor?
I designed a 3 phase motor driver which drives 3 coils (100 mOhm series resistance and 2 mH inductance).
And this is the timing, current waveform of the coils and the total power consumption of the system(with all the other logic and analog circuits):
avarage power consumption is 145.33 W. Coil currents are distorted as you can see but RMS current is 4.88 A for each:
I saw this online electric motor calculator. It requires Current(A), efficiency(%), Power factor(0-1) and Voltage(V) to calculate the horsepower. But I don't know what are meant by those. Which current? Efficiency of what? Power factor of what? Is it supply voltage? I am really messed up here. I appreciate any help. Thanks.