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Electrical 1 > AC Motors > Flashcards

AC Motors Flashcards

1
Q

4 advantages of AC motors

A

Less maintenance
More efficient
Cheaper
More compact

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2
Q

What is main disadvantage of AC motor

A

Difficult to vary speed

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3
Q

2 main components of AC motor

A

Stator

Rotor

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4
Q

What causes movement in 3 phase motor

A

Rotating magnetic field produced by stator

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5
Q

Most common AC motor on HM ships

A

Squirrel cage induction motor

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6
Q

Components of squirrel cage motor

A

Non drive end bearing
Drive end bearing
Copper end ring
Copper bars

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7
Q

How does a rotating magnetic field from the stator cause the rotor to rotate

A

Rotating magnetic field in stator induces current in rotor
Current in rotor forms magnetic field in rotor
Interaction causes rotor to follow stator

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8
Q

Why is there less maintenance on AC motor

A

No electrical connection to rotor, no brushes or slip rings

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9
Q

What would happen to running 3 phase motor if it lost a phase

A 
Keep running 
Loose power
Vibrate 
Heat up
Excessive noise
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10
Q

What would happen during startup if a 3 phase motor lost a phase

A

Wouldn’t start

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Electrical 1 (10 decks)

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