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Simple AC Motors J Pemberton

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Best Website on This! http://www.physclips.unsw.edu.au/jw/electr icmotors.html http://www.physclips.unsw.edu.au/jw/electr icmotors.html

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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.

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Simplest AC Motor To understand this we have to revise the field directions for solenoids. Check you agree with the next few slides

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Simple AC Motor- first part of cycle N S Look closely at the current directions, Do you agree with the field directions?

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Simple AC Motor- Make your predictions for the second half of cycle

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Simple AC Motor- Second half of cycle? N S

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The north pole will seek out the south poles of the solenoid and visa versa.

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Simple AC Motor- Now with the magnet N S Which way will the magnet want to go?

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Simple AC Motor- first part of cycle N S Did you guess correctly?

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Simple AC Motor- Second half of cycle The field gets switched. N S

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N S

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N S

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Simple AC Motor- Now were back to the beginning. N S Which way will the magnet want to go?

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Simple AC Motor- An off we go! N S Which way will the magnet want to go?

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Simple AC Motor- Second half of cycle The field gets switched. N S

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N S

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N S

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N S

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Simple AC Motor- Now were back to the beginning. N S Which way will the magnet want to go?

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Simple AC Motor- Now were back to the beginning. N S Which way will the magnet want to go?

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Simple AC Motor- Now were back to the beginning. N S Which way will the magnet want to go?

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Simple AC Motor- Now were back to the beginning. N S Which way will the magnet want to go?

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Simple AC Motor- Second half of cycle The field gets switched. N S

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N S

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AC motors often have more than two solenoids

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Simple AC Motor- four coils N S S N

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N S

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