4 Power Controller

Which of the following devices can be used as a phase controller?

• Thyristor

• Capacitor

• Inductor

• All of the above

What is the purpose of a phasor controller in a permanent magnet synchronous motor?

• a) To regulate the DC voltage supplied to the motor

• b) To control the speed of the motor

• c) To control the reactive power flow of the motor

• d) To control the active power flow of the motor

Which type of phasor controller is used for power factor correction in a permanent magnet synchronous motor?

• a) Fixed capacitor type

• b) Thyristor-controlled type

• c) Induction type

• d) AC voltage regulator type

How does a thyristor-controlled phasor controller operate in a permanent magnet synchronous motor?

• a) By switching the armature winding on and off

• b) By switching the field winding on and off

• c) By controlling the DC voltage supplied to the motor

• d) By controlling the firing angle of the thyristor

Which of the following is a disadvantage of using a phasor controller in a permanent magnet synchronous motor?

• a) Reduced torque output

• b) Increased losses in the motor

• c) Decreased power factor

• d) Increased system complexity

Which of the following types of signals are used as inputs to the phasor controller in a permanent magnet synchronous motor?

• Current and voltage

• Torque

• Force

• Phasor voltage

In a permanent magnet synchronous motor, the phasor controller uses which of the following feedback signals to ensure accurate control of the stator currents?

• controller

• Rotor position

• Load torque position

• Stator position