We list the four common insulation classes of electric
motors with an explanation of how they're calculated.
The electrical insulation system for wires used in electric
motors and other equipment defines the maximum temperature at which the
insulation can be operated for a sustained period of time without failing. In
order for users to select the right motor according to the intended
application, there are four common insulation classes in use, which are as
follows:
A – 105°C
B – 130°C
F – 155°C
H – 180°C
These figures are calculated by taking maximum ambient
temperature (usually 40°C), adding the maximum permissible temperature rise
plus a hotspot margin of 10°C.
An electric motor will not necessarily fail the instant the
insulation class temperature is reached, but doing so will significantly reduce
the designed operating life of the motor.
For more information on electric motor standards, feel free
to give us a call on 01621 868138 or email info@gibbonsgroup.co.uk and we’ll
get right back to you.
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