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Article #5613Re: velocity sensing for robotic joints
From: Bruce R Koball
Date: Tue, 14 Aug 1990 01:46
Date: Tue, 14 Aug 1990 01:46
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1262 bytes
The term LVDT mentioned by Joel Nevison stands for Linear Variable Differential Transformer. It typically consists of three windings and a movable core piece. The central, primary winding is excited by an AC signal, typically of several kHz. The two secondary windings are located on either side of the primary. The displacement to be measured is physically connected to the movable core. As the core moves, the coupling between the primary and the two secondaries changes. A phase detector is usually used to difference the two secondary signals and produce a DC output proportional to the core displacement. Its main advantages are excellent linearity and resolution. Bruce Koball Motion West 2210 Sixth Street Berkeley, CA 94710 415-540-7503 bkoball@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!portal!cup.portal.com!bkoball From: bkoball@cup.portal.com (Bruce R Koball) Newsgroups: sci.electronics Subject: Re: velocity sensing for robotic joints Message-ID: <32758@cup.portal.com> Date: 14 Aug 90 01:46:26 GMT References: <1990Aug7.205751.21206@ecf.utoronto.ca> <19481@well.sf.ca.us> <140483@sun.Eng.Sun.COM> <8441@ccncsu.ColoState.EDU> Organization: The Portal System (TM) Lines: 17