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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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Interactions between Electricity and Magnetism Interactions between electricity and magnetism all involve some motion of either charges (electricity) or.

Interactions between Electricity and Magnetism Interactions between electricity and magnetism all involve some motion of either charges (electricity) or.

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