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TORQUE TALK
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Torque Talk
How to Cope with Gear Motor Heat
Most gearmotors are designed to operate in an ambient temperature range
of 25º to 40ºC. Above 40ºC you risk damage to the motor and/or the gearbox. You can
compute temperature rise if you know the operating load, motor efficiency and thermal
rise coefficient.
Other factors besides ambient temperatures can overheat a gearmotor. Dust
or lint in the operating environment, for example, can add layers of unwanted thermal
insulation to the unit. Chemicals or mud may have the same effect, and frequent starts
and stops can also over heat the gearmotor. A permanent split capacitor AC motor may be
your best protection in these situations. If safety dictates a totally enclosed motor,
it may be non-ventilated (TENV) or fan-cooled (TEFC).
Our application engineers allow for some heat sinking at the mounting, but
if you expect operating temperatures higher than normal, talk to us before specifying.
(For operation of PMDC motors in extremely low temperatures, look for a control with a
ramping function.)
There's no reason to take any heat from specifying the wrong gearmotor.
A call to an application engineer at 1-800-AT-BISON will guide you to the cool choice
for your application.
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