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Subject: [DPRG] How to view Back EMF spikes on Oscilloscope
From: DeltaGraph at aol.com DeltaGraph at aol.com
Date: Thu Oct 12 01:20:03 CDT 2006

 
Open the circuit (keeping probes across motor) and you will see back EMF --  
of course the motor will slow down,  but if you periodically open the  
circuit, say with variable duty square wave from your microcontroller  through your 
h-bridge you can measure back EMF with say an A to D converter on  your 
micro-controller while keeping the motor running.
 
Acroname (_www.acroname.com_ (http://www.acroname.com/) )  sells an h-bridge 
/  motor driver that provides this functionality.
 
I would bet an encoder is a better way to go for accuracy -- especially if  
you are interested in doing odometry.

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