Deleted
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Post by Deleted on Oct 15, 2008 2:08:21 GMT -8
Dear All, my problem is that I have a large DC motor ( permanent magnet DC motor ), it operates at about 180VDC / 8 Amp.
When it rotates and reaches its speed ( 7200 rpm ) and I turned it off it still rotates for about 6 minutes..
I need to break it even this take HALF or ONE minute..
What is the best and safe way to make that..
By the way, when the motor is turned off it becomes a generator ( magnet rotates in a coil ), can I connect a load such a 200W
lamp to break it or connecting such load will not affect?!!
is the principle of connecting load will break the motor TRUE or NOT?
thanx in advance.. SHENDY
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Post by Gary Lecomte on Oct 15, 2008 5:25:40 GMT -8
Yes the 200 watt lamp should Break it fairly good.
Or even a much heavier load.
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Deleted
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Post by Deleted on Oct 27, 2008 16:46:38 GMT -8
Pardon me for being picky, I think you want to Brake the motor......not Break it, right?
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rmeyn
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My primary interests are electronics, sailing, bowling, and camping
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Post by rmeyn on Oct 27, 2008 17:20:40 GMT -8
He's talking about regenerative breaking . There are some rather neat ways to use a battery
and a H-type switching circuit to recover energy from the motor when it is removed from power. I strongly suspect the Toyota Prius works just the same way. What neat stuff!
rmeyn
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Deleted
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Post by Deleted on Oct 28, 2008 10:51:31 GMT -8
Wow, I need something like that on my XB ! I'm having to replace front and back Breaks on it at 30,000 That's aweful :-( Rear breaks always last at least 75,000 miles. Ron.
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rmeyn
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My primary interests are electronics, sailing, bowling, and camping
Posts: 163
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Post by rmeyn on Oct 29, 2008 5:07:22 GMT -8
You mean brakes right? Regenerative braking on your XB would require an electrical motor
battery, and hybrid engine/ electric motor drive , I believe. It would take some serious
engineering and I'm not sure it would be worth the expense!
rmeyn
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Deleted
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Post by Deleted on Oct 30, 2008 4:06:34 GMT -8
I'm sure it would not be worth the expenses. I was just wishful thinking. Besides if it had a motor and 3 tons of batteries to run it, there wouldn't be room for my cutie pie, so, I'll just change the breaks every 30k. Adios, Ron.
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