MadSci Network: Engineering

Re: Permanent magnet DC motors

Date: Wed Jul 1 23:21:06 1998
Posted By: Lawrence Skarin, Faculty, Electrical Engineering, Monroe Community College
Area of science: Engineering
ID: 899226253.Eg

Hi Glenn.  Always glad to talk to friends on the Canadian Shield.

The answer is no, but perhaps someone more creative than me can contrive a way. 
It doesnt sound like a good approach, anyway.  We try to do as much as we can 
electrically and as little as possible mechanically.  Moving brushes onto and 
off a commutator doesn't appear easy.

 Average voltage is what controls DC motor speed.  This is best done with pulse 
width modulation.  Hobbyist magazines have these circuits.  Also, kits from ads 
in these same magazines show speed control including motor for under $20 US.

Sorry I can't help more.

Larry Skarin

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