|No. of Magnetic Poles||Speed (rpm)|
When a motor starts to rotate the slip is 100 % and the motor current is at maximum. Slip and motor current are reduced when the rotor begin turning.
Frequency decreases when slip decrease.
Inductive reactance depends on the frequency and the slip. When the rotor is not turning the slip frequency is at maximum and so is the inductive reactance.
A motor has a resistance and inductance and when the rotor is turning the inductive reactance is low and the power factor approaches to one.
The inductive reactance will change with the slip since the rotor impedance is the phase sum of the constant resistance and the variable inductive reactance.
When the motor starts rotating the inductive reactance is high and impedance is mostly inductive. The rotor has a low lagging power factor. When the speed increases the inductive reactance goes down equaling the resistance.
Electrical induction motors are designed for different applications regarding characteristics like breakaway torque, pull-up torque, slip and more - check NEMA A, B, C and D classification of electrical inductions motors.
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
The alternating current In an AC circuit is generated by a sinusoidal voltage source.
480V electrical motor wiring data - NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp.
Operating speed of an induction motor depends on the input power frequency and the number of magnetic poles in the motor.
Full load operating torque vs. break down, pull up and locked rotor torque.
Synchronous and full load speed of amplitude current (AC) induction motors.
NEMA has established the four different designs A, B, C and D for electrical induction motors.
Inductive loads and power factors with electrical three-phase motors.
Electrical 3-phase equations.
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