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Thread: Speed Control for brush motors
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30th April 2009, 07:17 PM #46Senior Member
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30th April 2009 07:17 PM # ADSGoogle Adsense Advertisement
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30th April 2009, 09:59 PM #47Awaiting Email Confirmation
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Blouis79,
It's not on the Jaycar website catalogue. Click on the monthly fliers and you will find it there. It's the silicon chip one.
Have to get to the newsagent tomorrow and see if they still have a copy of the april mag. Like to know what this one is based on. Well they all are based on a scr/triac config. Just want to look at how the snubber network works.
Watson, have you seen this one. If you have ...any comments
BTW got the Kemo M012 fired up ...goes well.
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30th April 2009, 10:05 PM #48
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30th April 2009, 10:09 PM #49Awaiting Email Confirmation
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Watson,
Somehow I think you are right ....need that electronics forum and need it now.
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30th April 2009, 10:27 PM #50
Working on it
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30th April 2009, 11:01 PM #51Member
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The circuit uses a full wave rectifier and then pulse width modulation using a 50 A IGBT. http://au.farnell.com/fairchild-semi...questid=136493
Mark
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1st May 2009, 08:02 AM #52Awaiting Email Confirmation
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Mark, Watson,
Got the mag and checked it against the Nov 97 issue. Yes it's the same (well it's had an update) as the 97 one. It now has an overcurrent detector.
From the little time I had with the 97 one it behaved more like the Kemo units.
Looks like they sourced another for the IGBT as the one in the 97 mag I could no longer get. (could get all other components and the circuit board but not the IGBT).
So now it is order, wait till it arrives, build, test and hopefully not be dissappointed.
I need this for my router.
Now to find time.
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14th August 2018, 01:30 PM #53
I know this is an old thread but wanted to share this and not start a new one.
I have my dads AEG 500 watt hammer drill in a Record Power drill press, it's one of the older blue ones with the Rohn chuck and still works like new, it's 2 speed and the lower speed is still way too fast for drilling metal or larger wood bits, was drilling some aluminum the other day and the bit was jumping around, for a moment I thought it was set to hammer but it wasn't.
So I thought I would try one of these 2000 watt Adjustable Motor Speed Controllers from Ebay:
6123noI7yHL._SY355_.jpg
I mounted it in a plastic case from Jaycar and used one of those short extension cords with the molded plug and socket, simply cut the extension cord cable and fixed the plug end to the inputs and the socket end to the outputs and joined the earths together.
I wouldn't use it for anything large like my 1650 watt router, but for the drill it's great and since the drill has gears even though I can slow the drill down to a couple of hundred rpm's the motor is still going fast enough to keep it cool. The whole project cost me less than $15.00.
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14th August 2018, 03:41 PM #54.
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A drill press situation is probably OK because the typical work pattern consists of short time events but on machinery where long stints of work might take place a plastic box would not allow sufficient heat to escape from the heat sink and your want to provide some, maybe even forced, ventilation. These things are basically just oversize light dimmers and I have lost count how many over stressed burnt out light dimmers I have replaced for various folks. The power ratings for these types of controllers are highly optimistic and to be safe I would halve the ebay quoted values.
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14th August 2018, 06:28 PM #55
I agree Bob, the 500 watt drill doesn't draw much current and not being on for long the heat sink on Triac doesn't even get hot. Something I tested before putting it into the case. I notice they have a beefier 4000w one which ironically comes with a 10amp fuse, those Chinese are not the best with maths, the heat sink is much bigger and some have cooling fans, they would definitely have to be mounted in a ventilated enclosure if you wanted to get up to around 2000 watts.
I am surprised how well it works and have drilled a few holes since.
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14th August 2018, 06:42 PM #56.
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