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Questions and Answers
What is a significant characteristic of a d.c. motor in terms of power delivery?
What is a significant characteristic of a d.c. motor in terms of power delivery?
- Power is delivered by induction.
- Power is converted from mechanical to electrical energy.
- Power delivery requires complex synchronization.
- Power is delivered directly to the armature. (correct)
Which of the following statements accurately describes the operation of an induction motor?
Which of the following statements accurately describes the operation of an induction motor?
- It is primarily designed for household appliances.
- It operates using direct supply to the rotor.
- It relies on constant speed regardless of load.
- It receives power by induction similar to a transformer. (correct)
What is one of the main advantages of a polyphase induction motor?
What is one of the main advantages of a polyphase induction motor?
- It requires high maintenance.
- It has a complicated construction.
- It has an unbreakable construction. (correct)
- It is the most expensive motor available.
What effect does an increase in load have on the speed of an induction motor?
What effect does an increase in load have on the speed of an induction motor?
What is a disadvantage of an induction motor when compared to a d.c. shunt motor?
What is a disadvantage of an induction motor when compared to a d.c. shunt motor?
Flashcards
Induction Motor
Induction Motor
A type of electric motor where the rotor receives electric power by induction, similar to how the secondary winding of a transformer receives power from the primary.
Squirrel-Cage Motor
Squirrel-Cage Motor
An induction motor with a rotor consisting of a cage-like structure with conducting bars, designed for high starting torque and robustness.
Self-Starting
Self-Starting
The ability of an electric motor to start up and run smoothly without needing an additional motor to initiate rotation.
Speed Regulation
Speed Regulation
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Efficiency
Efficiency
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Study Notes
DC Motors
- DC motors conduct electricity directly to the armature (rotating part) through brushes and commutators.
- They are sometimes called conduction motors.
AC Motors (Induction Motors)
- AC motors, specifically induction motors, receive power through induction, similar to a transformer's secondary.
- The rotor receives power from the induction of the stationary primary winding, acting like a rotating transformer.
- Polyphase induction motors are widely used in industrial drives.
Advantages of Induction Motors
- Simple and robust construction, especially squirrel-cage types.
- Low cost and high reliability.
- High efficiency, reduced friction losses due to no brushes in normal operation.
- Good power factor.
- Minimal maintenance.
- Self-starting with simple starting arrangements, no need for external mechanisms.
Disadvantages of Induction Motors
- Speed is typically fixed and difficult to adjust without loss of efficiency.
- Speed decreases with increasing load, similar to DC shunt motors.
- Starting torque is generally lower than that of a DC shunt motor.
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