What is Phasor Diagram for AC Series Motor?
What is Phasor Diagram for AC Series Motor?
Phasor diagram definition
The phasor diagram illustrates the phase relationship between different electrical quantities in AC series motors.
Characteristics of AC series motor
Power factor characteristic
Velocity current characteristic
Torque current characteristics
Torque speed characteristics
Power output characteristic
Power factor
A high power factor requires low reactance and back electromotive force, which decreases when overloaded.
Velocity and back electromotive force
The speed of the motor is proportional to the back electromotive force, and the AC motor has a lower speed due to the higher voltage drop.
Torque and current
Ignoring the small phase Angle (the Angle between the magnetic flux and the current) and the saturation effect, torque is proportional to the square of the current.
Torque speed characteristics
The relationship between torque and speed can be derived from the torque current and speed current characteristics. The torque speed characteristics are shown in the figure.
Power output characteristic
The mechanical output power of an AC series motor is calculated by multiplying the back electromotive force and current. The mechanical power is proportional to the current, if we ignore the slight decrease in the back electromotive force as the current increases.
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