Overview of AC Motors in Electrical Engineering
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1. AC Motor: Alternating current (AC) motors use an electrical current, which reverses its direction at regular
intervals.
2. Stator: The stationary electrical component of an AC motor.
3. Rotor: The rotating electrical component of an AC motor, which in turn rotates the motor shaft.
4. Variable Frequency Drives: Devices that can be equipped with AC motors to improve speed control,
though they reduce power quality.
5. Synchronous Motor: An AC motor where the rotor travels at the same speed as the rotating magnetic field.
6. Induction Motor: The most common motors used for various equipment in industry, known for their simple
design and low cost.
7. High Power to Weight Ratio: Induction motors have about twice the power to weight ratio of a DC
motor.
8. Single-Phase Induction Motor: A type of induction motor that has one stator winding, operates with
a single-phase power supply, and is commonly used in household appliances.
9. Three-Phase Induction Motor: Induction motors that use a three-phase supply to produce a magnetic
field and are self-starting.
10. Shaded-Pole Motor: A nonreversible motor that delays the creation of the magnetic field in part of the
stator poles.
11. Split-Phase Motor: A motor with a start winding and a centrifugal switch that opens after startup to remove
the start winding from the circuit.
12. Capacitor Start Motor: A motor that disconnects the capacitor after the motor speed picks up.
13. Capacitor Run Motor: A motor that keeps the capacitor connected during operation to maintain low
electric power consumption.
14. Capacitor Start-Run Motor: A motor that uses two capacitors, one for starting and one for running, to
improve power consumption.
15. Poles in a Motor: Windings which produce the magnetic field(s) necessary to cause the rotor to turn.
16. Synchronous Speed (Ns): The speed at which a synchronous motor runs, given by the equation Ns =
120 f / P, where f is the frequency and P is the number of poles.
17. DC Voltage for Excitation: Required by synchronous motors for starting excitation.
18. Low Starting Torque: A characteristic of synchronous motors, making them suitable for applications that
start with a low load.
19. Three-Phase Stator Windings: Windings in a synchronous motor that produce a rotating magnetic
field.
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Study online at https://quizlet.com/_i20xrj
1. AC Motor: Alternating current (AC) motors use an electrical current, which reverses its direction at regular
intervals.
2. Stator: The stationary electrical component of an AC motor.
3. Rotor: The rotating electrical component of an AC motor, which in turn rotates the motor shaft.
4. Variable Frequency Drives: Devices that can be equipped with AC motors to improve speed control,
though they reduce power quality.
5. Synchronous Motor: An AC motor where the rotor travels at the same speed as the rotating magnetic field.
6. Induction Motor: The most common motors used for various equipment in industry, known for their simple
design and low cost.
7. High Power to Weight Ratio: Induction motors have about twice the power to weight ratio of a DC
motor.
8. Single-Phase Induction Motor: A type of induction motor that has one stator winding, operates with
a single-phase power supply, and is commonly used in household appliances.
9. Three-Phase Induction Motor: Induction motors that use a three-phase supply to produce a magnetic
field and are self-starting.
10. Shaded-Pole Motor: A nonreversible motor that delays the creation of the magnetic field in part of the
stator poles.
11. Split-Phase Motor: A motor with a start winding and a centrifugal switch that opens after startup to remove
the start winding from the circuit.
12. Capacitor Start Motor: A motor that disconnects the capacitor after the motor speed picks up.
13. Capacitor Run Motor: A motor that keeps the capacitor connected during operation to maintain low
electric power consumption.
14. Capacitor Start-Run Motor: A motor that uses two capacitors, one for starting and one for running, to
improve power consumption.
15. Poles in a Motor: Windings which produce the magnetic field(s) necessary to cause the rotor to turn.
16. Synchronous Speed (Ns): The speed at which a synchronous motor runs, given by the equation Ns =
120 f / P, where f is the frequency and P is the number of poles.
17. DC Voltage for Excitation: Required by synchronous motors for starting excitation.
18. Low Starting Torque: A characteristic of synchronous motors, making them suitable for applications that
start with a low load.
19. Three-Phase Stator Windings: Windings in a synchronous motor that produce a rotating magnetic
field.
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