In the latest of our jargon-busting blogs we’re asking what
is cogging and what effect does it have on an electric motor’s performance?
When the rotor in an electric motor turns, it passes through
the magnetic poles created by the stator windings. As the rotor passes from one
pole, the attraction to the next causes a jerking motion. This is known as
cogging (or detent).
The severity is dependent on the motor’s speed, because if
the rotor is moving fast enough then cogging does not have the chance to take
effect. However, if the motor is running very slowly then cogging will be much
more pronounced.
In order to reduce the effect of cogging, a rotor’s
conductor bars are skewed (see photo). This means that as one conductor leaves
a magnetic field, the next one enters it simultaneously. This results in much
smoother running than if the conductors were straight.
For technical advice relating to electric motors or any of
our products, give us a call on 01621 868138 or email info@gibbonsgroup.co.uk.
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