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Why does an ac contactor need shading rings?

Updated: 8/10/2023
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Denoes

Lvl 1
11y ago

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In a AC contactor, a shaded ring is essential to prevent it from buzzing twice a cycle. Ac contactor takes a input of alternating voltage resulting an alternating current and flux through its windings. So The contactor buzzes each time the magnitude of alternating magnetic field reaches zero. The shaded rings are provided at some part of the core. When the alternating flux cuts them the produce another alternating magnetic field which is out of phase from the main magnetic field. So the resultant magnetic field no more zero at the contacts and which prevents the contact from buzzing.

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Q: Why does an ac contactor need shading rings?
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