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Module 1: Magnets and magnetism

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XSIQ
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Physics - AC motors

AC motors

The AC motor differs from the DC motor in that it does not require a split
ring commutator. Remember that the role of the split ring commutator was to
reverse the direction of the current in the loop each half turn so that the
loop would continue to spin in the one direction. Since an AC motor is
already receiving current that is reversing each half cycle, a split ring
commutator is not required. It is necessary to synchronise the rate at
which the AC supply varies with the rate of rotation of the loop. As
mentioned, real motors have a number of sets of loops so that the turning
effect is more consistent during the entire cycle. The AC motor requires a
slip-ring commutator so that the leads from the rotating loops can maintain
contact with the power supply without becoming tangled. Each lead is always
in contact with the one ring that is connected to a terminal of the AC
supply.

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