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Reply by Gerald

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Posted on Router Lift for Hitachi M12V ?

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Gerald

54 posts in 2868 days


#1 posted 07-15-2013 01:02 AM

OK, BArnold. I understand that whatever it is, there is a problem with using an external speed controller with a variable speed machine (router in this case), but what about with a single speed router? My surmise is that the RPMs of an otherwise single speed universal motor are controlled by the AC frequency (60 Hz, 50 Hz, etc.). RPMs can be reduced by lowering the input voltage, but then you run into current/heat and motor power problems like you commonly do with low voltage situations with other appliance/tool motors. Voltage reduction on an AC motor has to be an all bad solution, IMHO. Frequency control is probably the operationally ideal solution but that is too complex and expensive for everyday application. It does seem to me, however, that current control might be an easy enough and acceptable option. Guess I need to ask my EE nephew this question and see what he says. I’ll also ask PC, but the answer I expect to get from them will likely come from no deeper than the warranty text. Guess I also need to confirm that the PC 75192 motor is, in fact, a “universal” motor, or if not, what it is.

Thanks for your feedback, anyway.

-- Gerald, Rural North Central Arkansas


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