This is the benefit of talking to a manufacturer who makes both motors VSD/VFFD speed controllers.
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It's becoming more difficult, as more and more manufacturers get rid of their in house tech dept and farm such inquiries out to their dealer network.
This leads to a dilution of experience and if you couple this with the good old "duty of care" fear, then it's becoming very difficult to find genuine experience or anyone willing to give an opinion.
If the motor is wound/designed for speed control it should be able to handle RPM down to 20-25% without a problem.
The other solution is to replace the factory fan with an axial/computer type, wrapping the TEFC motor fins in Aluminium to make a "tube" around the motor and to ensure the generated air flow stays close to the motor body, with the Aluminium "wrap" helping to act as a heatsink to also remove heat.
On 13 September 2012 14:18, Michael Mccomb <mccomb.michael@yahoo.com> wrote:
it seems that the cooling mechanism for electric motors usually consists of a shaft mounted fan of some sort... in one way this is obvious but then again at low rpms there isn't much cooling going on and this is too bad as electric motors have the advantage of delivering high torque at low rpm.... seems like an externally powered fan system that move air at sufficient velocity regardless of the the motor rpm would be much preferable....interested in comments
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