Motor AC

Which is the most commonly used AC motor?

• Series Motor

• Synchronous Motor

• Induction Motor

• Universal Motor

What is the main weakness of a synchronous motor?

• Cannot be operated at constant speed

• Requires external DC voltage source

• Does not have initial torque

• Has low efficiency

How does the induction motor work?

• The rotating magnetic field of the stator induces voltage in the rotor

• The rotor is directly connected to an external voltage source

• The magnetic field of the rotor rotates and produces a magnetic field in the stator

• There is no rotating magnetic field

What type of induction motor uses a rotor winding that is directly connected?

• Induction Shadow Motor

• Series Motor

• Typical Induction Motor

• Synchronous Motor

What is the function of a capacitor in a capacitor-start induction motor?

• Reduce initial torque

• Regulate motor speed

• Produce phase difference between main winding and starting winding

• Produce magnetic field on the rotor

What causes the magnetic field in the shaded-pole induction motor to move back and forth?

• Shadow winding

• Capacitor

• Primary winding

• Main winding

What causes the magnetic field in the shaded-pole induction motor to move back and forth?

• Capacitor

• Initial winding

• Shaded pole winding

• Main winding

WHAT TYPE OF WINDING IS IN THE IMAGE BESIDE

Let's use an example of a 6-pole motor, built to operate on 50 hertz. The synchronous speed is determined as follows:

• 1000 RPM

• 1100 RPM

• 1200 RPM

• 1300 RPM

What is the difference between resistance start and capacitor start on AC motors?

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