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Article #2143Re: Current driver/power amp for solenoid
From: Winston
Date: Tue, 27 Apr 2004 19:27
Date: Tue, 27 Apr 2004 19:27
31 lines
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2750 bytes
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. http://www.asraymond.com/spec/faq.asp --Winston
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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 12:27:12 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!news.glorb.com!wn14feed!worldnet.att.net!216.196.106.140!border1.nntp.sjc.giganews.com!border2.nntp.sjc.giganews.com!nntp.giganews.com!nntp.speakeasy.net!news.speakeasy.net.POSTED!not-for-mail NNTP-Posting-Date: Tue, 27 Apr 2004 14:27:12 -0500 Date: Tue, 27 Apr 2004 12:27:12 -0700 From: Winston <Winston@BigBrother.net> User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: sci.electronics.design,aus.electronics Subject: Re: Current driver/power amp for solenoid References: <6864d8ba.0404270227.9c2fd1b@posting.google.com> <408e453e$0$16576$5a62ac22@freenews.iinet.net.au> <c6m0ev0263j@drn.newsguy.com> In-Reply-To: <c6m0ev0263j@drn.newsguy.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Message-ID: <-JGdnbKqaJ6NKRPd3czS-w@speakeasy.net> Lines: 32 NNTP-Posting-Host: 66.93.131.49 X-Trace: sv3-u7RXQC2IIsjQ95XBGkOjrjXGHZxoHF5PoaBX4x/6XBj7w+FF4tQkaTFU2D678n2sIvqHDblf3XsQFz1!rZGKcvln5716YQZrHsrP14UuYWXSDAV9/kbKQrVhGlX+a1wPHMvA2iMqvjtT+3UTWFXiv/MOUEcJ!KO8l0O5dJirAQjtyooA= X-Complaints-To: abuse@speakeasy.net X-DMCA-Complaints-To: abuse@speakeasy.net X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.1