Newsgroups: comp.robotics
Subject: DC motor current sensor
From: greg.jackson@mecheng.fullfeed.com (Greg Jackson)
Path: brunix!news.Brown.EDU!noc.near.net!howland.reston.ans.net!math.ohio-state.edu!uwm.edu!daffy!uwvax!gorgon!fullfeed!mecheng!greg.jackson
Distribution: world
Message-ID: <af.2061.33.0NAF5F02@mecheng.fullfeed.com>
References: <jnicol.751591641@sfu.ca>
Date: Tue, 26 Oct 93 18:41:00 +0000
Organization: MechEng / ASME
Lines: 15


in a recent message:
-> Message-ID: <jnicol.751591641@sfu.ca>
->
-> Does anyone know a good way of measuring the current drawn by a DC
-> motor (aside from measuring the voltage drop across a resistor) for
-> the purpose of determining the load torque? I want my 6811 to monitor
-> the current for a stall condition but not be fooled by the transient

There are a number of industrial DC current sensors available.  I think
most of them work on a sensitive hall effect device.  I have a little
clamp on device that will provide a mV/mA to any multimeter and can be
switched to provide a mV/A.  It can measure more than 200 A.  There is a
magnetic field that circles the wire when current goes through, and the
sensor measures the field.
