treadmill motors (was High-Voltage Power Steering Pump)

[Peter VanDerWal <peter_vanderwal@MSN.COM>]

Lee Hart  wrote

>These treadmill motors are all over the place in the surplus market, and
seem
>unusually small and poorly ventilated for a 1 HP motor. Has anyone tested
any
>of them to see how much HP they actually deliver?
>
>I have a sneaking feeling they have "marketing ratings" rather than
>engineering ratings.


    I'm not sure yet how much power the one I'm playing with actually
produces.  I do know that at it's maximum continuous rating it's drawing
855watts (90v @ 9.5A).  Since it has virtually no cooling (no fan and only
four small holes on each end for ventilation)  I'm assuming that it must
have fairly high efficiency.
    I've done some simple tests on it that indicate it is probably better
than 80% efficient when running at less than 19% of it's rated power (36v @
4.4A).
    If anyone is interested I have a webpage describing the tests at
http://www.angelfire.com/oh/PetesCafe/testbed.html



treadmill motors (was High-Voltage Power Steering Pump)