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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!zehntel!zinfandel!joe
From: joe@zinfandel.UUCP
Newsgroups: net.auto
Subject: Re: measuring torque in-situ?
Message-ID: <1707@zehntel.UUCP>
Date: Fri, 14-Dec-84 19:17:03 EST
Article-I.D.: zehntel.1707
Posted: Fri Dec 14 19:17:03 1984
Date-Received: Sun, 16-Dec-84 09:25:22 EST
Sender: berry@zehntel.UUCP
Organization: Zehntel Automation Systems Inc, Walnut Creek CA
Lines: 29
Nf-ID: #R:cornell:-100:zinfandel:3200071:000:921
Nf-From: zinfandel!joe    Oct 30 14:47:00 1984



	Hi. I suppose that torque could be measured in situ
	by two magnet and sensors. The magnets would be at
	opposite ends of the drive shaft rotating past their
	respective detectors. The RPM of the shaft is avail-
	able, and by detecting the change in gap between the
	passage of the two magnets we would have the torsional
	displacement between the two spots. Given the distance
	between them on the shaft and the torsional resistance
	of the shaft cross section we would have both the torque
	and power output of the system to that point.

	torque = rotational stiffness * angular displacement
		------------------------------------
			length

	power = torque * RPM

	These would certainly be fun additions to a cars instrument
	panel.
		  
	" Cogito ergo Spud. "  ( I Think, therefore A Yam. )

Joseph Weinstein	Zehntel Inc.	(ihnp4!zehntel!zinfandel!joe)
			P.O. Box 8016
(415)932-6900		Walnut Creek California 94596