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Questions and Answers
Three types of single-phase motor include induction motors, ____, and universal motors.
Three types of single-phase motor include induction motors, ____, and universal motors.
synchronous motors
The direction of rotation of a single-phase motor can be reversed by changing the phase of the ___.
The direction of rotation of a single-phase motor can be reversed by changing the phase of the ___.
auxiliary winding
A ____ switch is essential in single-phase motors for disconnecting the starting winding once the motor reaches full speed.
A ____ switch is essential in single-phase motors for disconnecting the starting winding once the motor reaches full speed.
centrifugal
The auxiliary winding in a single-phase motor provides an additional phase that helps create the initial ____, necessary for starting the motor.
The auxiliary winding in a single-phase motor provides an additional phase that helps create the initial ____, necessary for starting the motor.
A _____ is often used in single-phase motors to improve the power factor and performance during operation.
A _____ is often used in single-phase motors to improve the power factor and performance during operation.
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Study Notes
Single Phase Motor Types
- Split-phase motor: Uses two windings, a main winding and a starting winding, to create a rotating magnetic field.
- Capacitor-start motor: Similar to split-phase, but uses a capacitor in series with the starting winding to improve starting torque.
- Capacitor-start capacitor-run motor: Uses two capacitors, one for starting and another for running, to improve efficiency and running torque.
Reversing Rotation
- Swapping the connections of the starting winding: This changes the direction of the magnetic field produced by the starting winding, thus reversing the motor’s rotation.
Single-Phase Motor Components
- Centrifugal switch: Used to disconnect the starting winding once the motor reaches a certain speed.
- Auxiliary winding: The starting winding (with or without a capacitor) provides the starting torque.
- Capacitor: Increases the starting torque of the motor by increasing the phase difference between the currents in the main and auxiliary windings.
Contactor Symbol
- This symbol represents a contactor with 24Vdc coils and 3-phase output contacts.
- The 'N/O' (Normally Open) and 'N/C' (Normally Closed) contacts are also indicated.
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