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motor, electric. The Columbia Encyclopedia, Sixth Edition. 2001-05 (520 words) |
 | The traditional electric motor consists of a conducting loop that is mounted on a rotatable shaft. |
| In an alternating current (AC) motor, the current flowing in the loop is synchronized to reverse direction at the moment when the plane of the loop is perpendicular to the magnetic field and there is no magnetic force exerted on the loop. |
| The speed of AC induction motors is set roughly by the motor construction and the frequency of the current; a mechanical transmission must therefore be used to change speed. |
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