Re: Speed control for woodworking - how does it work?

On May 2, 9:24�pm, ---@--- (Robert Scott) wrote:
Does anyone know how these aftermarket speed controls for woodworking tools like
routers work? �At first I thought they were just open-loop duty-cycle
controllers. �If that were the case, then the router speed would sag a lot when
the work is applied to load it down. �I'm sure the built-in speed controls use
some sort of RPM sensor for feedback, and so can maintain speed under varying
loads. �But from the reports from woodworkers in one forum I have been reading,
these controls really do work. �For example, this one:

�http://www.rockler.com/product.cfm?Offerings_ID=10760&TabSelect=Details

But there is no obvious speed feedback to the external controller. �Is it
possible that the controller can sense the RPM based on detecting small
variations in the current?

Robert Scott
Ypsilanti, Michigan

A brushed motor will go at a constant speed (within reason) if you
apply a constant voltage to it. A small speed drop occurs on load due
to the armature resistance but this can be compensated for by
measureing the current and applying a proportional increase in
voltage. Around 1% variation is possible over the full load range is
possible by this method.
.

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