Simple AC Motors
J Pemberton
Best Website on This!
http://www.physclips.unsw.edu.au/jw/electricmotors.html
There are two main types
Synchronous- a magnet or current carrying coil moving due to a changing magnetic field.
Induction- a piece of metal in a changing magnetic field has currents set up in it which then experience a force.
Simplest AC Motor
To understand this we have to revise the field directions for solenoids.
Check you agree with the next few slides
Simple AC Motor- first part of cycle
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SLook closely at the current directions, Do you agree with the field directions?
Simple AC Motor- Make your predictions for the second half of cycle
Simple AC Motor- Second half of cycle?
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S
The north pole will seek out the south poles of the solenoid and visa versa.
Simple AC Motor- Now with the magnet
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S
Which way will the magnet want to go?
Simple AC Motor- first part of cycle
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S
Did you guess correctly?
Simple AC Motor- Second half of cycle The field gets switched.
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S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Now we’re back to the beginning.
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Which way will the magnet want to go?
Simple AC Motor- An off we go!
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S
Which way will the magnet want to go?
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Now we’re back to the beginning.
N
S
Which way will the magnet want to go?
Simple AC Motor- Now we’re back to the beginning.
N
S
Which way will the magnet want to go?
Simple AC Motor- Now we’re back to the beginning.
N
S
Which way will the magnet want to go?
Simple AC Motor- Now we’re back to the beginning.
N
S
Which way will the magnet want to go?
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
Simple AC Motor- Second half of cycle The field gets switched.
N
S
AC motors often have more than two solenoids
Simple AC Motor- four coils
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S N
Simple AC Motor- four coils
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S N
Simple AC Motor- four coils
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S
S N
Simple AC Motor- four coils
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S
S N
Simple AC Motor- four coils
N S
S
N
Simple AC Motor- four coils
N S
S
N
Simple AC Motor- four coils
N S
S
N
Simple AC Motor- four coils
N S
S
N
Simple AC Motor- four coils
NS
S
N
Simple AC Motor- four coils
NS
S
N
Simple AC Motor- four coils
NS
S
N
Simple AC Motor- four coils
NS
S
N
N
S