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Article #2144Re: Current driver/power amp for solenoid
From: Richard Freeman
Date: Wed, 28 Apr 2004 05:31
Date: Wed, 28 Apr 2004 05:31
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2605 bytes
"Winston" <Winston@BigBrother.net> wrote in message news:-JGdnbKqaJ6NKRPd3czS-w@speakeasy.net... > Winfield Hill wrote: > > Rob wrote... > > > >>Lyndon wrote ... > > > > > >>>This system is all part of a feedback pedal design that will > >>>provide more resitance the further you push in the pedal. We have > >>>a potentiometer measuring pedal displacement and this goes into a > >>>microcontroller, through a simple transfer function and produces > >>>the output signal which will drive the solenoid. ... > > > > > >>Lyndon - have you considered using a PWM motor controller? For a > >>quick test Dick Smith do a $20, 20A controller which I think is > >>PWMable. Perhaps others may be able to expand on this approach. > > > > > > I wonder if Lyndon wouldn't be better off with a geared-down motor > > i torque mode rather than a solenoid. They have rather poor force > > vs. displacement characteristics, whereas motors are excellent. > > > > Lyndon, do you really only need pedal resistance to increase linearly > between 15% and 85% of displacement? A compression spring on your pedal > would automatically do the math and provide the proper resistance. Why do a simple solution when a much more complex one is (not) available ?
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,5b2dbfc34b631dba X-Google-Thread: 103407,c45561e0a5ee3714 X-Google-Attributes: gid112d1e,gid103407,public X-Google-ArrivalTime: 2004-04-27 22:24:39 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!news.glorb.com!news.primus.ca!news.primus.ca!nntp-post.primus.ca!53ab2750!not-for-mail From: "Richard Freeman" <deletethisrichard@atps.net> Newsgroups: sci.electronics.design,aus.electronics References: <6864d8ba.0404270227.9c2fd1b@posting.google.com> <408e453e$0$16576$5a62ac22@freenews.iinet.net.au> <c6m0ev0263j@drn.newsguy.com> <-JGdnbKqaJ6NKRPd3czS-w@speakeasy.net> Subject: Re: Current driver/power amp for solenoid Lines: 33 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 5.50.4927.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4927.1200 X-Original-NNTP-Posting-Host: 210.50.3.43 Message-ID: <408f4014$1_1@news.iprimus.com.au> Organization: iPrimus Customer - reports relating to abuse should be sent to abuse@iprimus.com.au X-Original-NNTP-Posting-Host: 127.0.0.1 Date: Wed, 28 Apr 2004 15:31:39 +1000 NNTP-Posting-Host: 203.134.67.67 X-Complaints-To: news@primus.ca X-Trace: nntp-post.primus.ca 1083129665 203.134.67.67 (Wed, 28 Apr 2004 01:21:05 EDT) NNTP-Posting-Date: Wed, 28 Apr 2004 01:21:05 EDT