Magnetic field

:For other senses of this term, see magnetic field (disambiguation).

Rotating magnetic fields

A rotating magnetic field is a magnetic field which rotates in polarity at non-relativistic speeds. This is a key principle to the operation of alternating-current motor. A permanent magnet in such a field will rotate so as to maintain its alignment with the external field. This effect is utilised in alternating current electric motors. A good rotating magnetic field can be constructed using three phase alternating currents (or even with higher order polyphase systems). Synchronous motors and induction motors use a stator's rotating magnetic fields to turn rotors. In 1882, Nikola Tesla identified the concept of the rotary magnetic field. In 1885, Galileo Ferraris independently researched the concept. In 1888, Tesla gained {{US patent|381968}} for his work. Also in 1888, Ferraris published his research in a paper to the Royal Academy of Sciences in Turin.

Related Topics:
Alternating-current motor - Electric motor - Synchronous motor - Induction motor - Stator - Rotor - 1882 - Nikola Tesla - 1885 - Galileo Ferraris - 1888 - Turin

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