Finding a 12V DC motor controller - diyAudio
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Old 26th April 2006, 08:27 AM   #1
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Default Finding a 12V DC motor controller

I'm building up a DIY TT and I pretend to use a 12V DC motor but I'll need a proper controller to set the exact speed (only for 33 RPM set with the help of a strobe disc/light).

I've got a couple of 12V MAXON and one PREMOTEC motor (taken from a REGA P3) and I just need that controller to put things moving

I've got a 220/50HZ voltage adjustable power supply model ZETAGI HP156S (Stabilized 416 V 7 A with 2 Instrum).

CAN ANYBODY HELPME TO FIND THE PROPER CONTROLLER? It can be assembled or in kit form.

Thanks
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Old 26th April 2006, 01:32 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

The speed of a DC motor is related to the voltage across it.

That is the motor speeds up until the back emf = applied voltage.

So all you need is a precision adjustable voltage supply,
that current limits - this will set your starting torque.

Something like an LM317 with a bandgap voltage reference.

/sreten.
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Old 26th April 2006, 02:31 PM   #3
paulb is offline paulb  Canada
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Some form of feedback will be needed to keep the speed constant, a regulated voltage source will not be enough.
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Old 26th April 2006, 04:41 PM   #4
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by paulb
Some form of feedback will be needed to keep the speed constant,
a regulated voltage source will not be enough.
Hi,

If the DC motor is not designed to be servo'd there is not much you can do.

A DC motor will run near constant speed, drawing more current if required.

The Origin Live dc motor kit is simply voltage driven, no-ones complained
about speed drift is any of the reviews of fitting the OL motor.

/sreten.
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Old 26th April 2006, 05:40 PM   #5
SvErD is offline SvErD  Norway
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Default Like this?

Who is interested in a groupbuy of Mark Kelly's DC controller PCB and related parts
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I don't suffer from insanity, I enjoy every minute of it!
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Old 27th April 2006, 03:43 AM   #6
paulb is offline paulb  Canada
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Sounds like exactly what you are looking for.
I think I would go for the error correcting version of the circuit, I mistrust the positive feedback - it might be finicky.
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Old 27th April 2006, 11:47 AM   #7
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The the Rega P3 uses an AC motor.

If you got a Premotec DC one from a Rega, it's quite possibly an Origin Live retrofit (the OL kit I bought 4 years ago uses a Premotec), in which case if you still have the Rega, it might have the OL board in it.

If so. and it's still working, all you need is a decent transformer with selectable V out.

A
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Old 27th April 2006, 01:29 PM   #8
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http://www.altmann.haan.de/turntable/

This guy uses a stepper motor fed with a signal from a cdp.
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Old 29th April 2006, 10:31 PM   #9
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Thanks for all the help

Can this work propely with a one of those 12V maxon motors? :

http://cgi.ebay.com/ws/eBayISAPI.dll...Pr4_PcY_BID_IT

thanks
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Old 1st May 2006, 01:43 PM   #10
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Hi,

could this help you?

http://uk.farnell.com/jsp/endecaSear...=4913425&N=401

I was thinking of using it with a 6 V maxon motor.

IK
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