DC motor speed controller, too many inputs!

[John Doe]

(crossposted)


Just bought a 36 V cordless drill, uses lithium ion batteries. Opened
it up and discovered there are at least six wires coming from the
battery pack to the motor speed controller.

Does that mean the speed controller is not going to work if I just
connect 36V DC to the plus and minus terminals of the speed
controller?

I suspect at least one of the terminals coming from the battery pack
is to monitor the lithium-ion battery temperature (probably help keep
it from exploding). I don't know what the others are for.

Maybe I'll have to buy a matching battery pack instead of using my own
(36V, 3.5AH), or maybe I'll bypass the speed controller and go
directly to the motor. But I'd rather use their speed controller even
with its tiny heat sink.

Can't find DeWalt's amp hour rating for their 36V lithium-ion battery
packs, lots of hype about the technology though.

Thank you.

 

[John Doe]

2716.5101
36VDC/20A
629321-00

r205

 

[[email protected]]

(crossposted)

Just bought a 36 V cordless drill, uses lithium ion batteries. Opened
it up and discovered there are at least six wires coming from the
battery pack to the motor speed controller.

Does that mean the speed controller is not going to work if I just
connect 36V DC to the plus and minus terminals of the speed
controller?

I suspect at least one of the terminals coming from the battery pack
is to monitor the lithium-ion battery temperature (probably help keep
it from exploding). I don't know what the others are for.

Maybe I'll have to buy a matching battery pack instead of using my own
(36V, 3.5AH), or maybe I'll bypass the speed controller and go
directly to the motor. But I'd rather use their speed controller even
with its tiny heat sink.

Can't find DeWalt's amp hour rating for their 36V lithium-ion battery
packs, lots of hype about the technology though.

Thank you.

I loved your TV series, perhaps a movie is in the works?

[8~{} Uncle Monster

 

[John Doe]

On Jul 10, 12:20 pm, John Doe <j... usenetlove.invalid> wrote:

I loved your TV series, perhaps a movie is in the works?

Is that one of your more useful replies?

[8~{} Uncle Monster



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From: unclemon gmail.com
Newsgroups: sci.electronics.design,sci.electronics.basics
Subject: Re: DC motor speed controller, too many inputs!
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[[email protected]]

Is that one of your more useful replies?

I was really upset when "John Doe" was canceled. It
was one of the better shows on TV.

[8~{} Uncle Monster

 

[redbelly]

(crossposted)

Just bought a 36 V cordless drill, uses lithium ion batteries. Opened
it up and discovered there are at least six wires coming from the
battery pack to the motor speed controller.

Does that mean the speed controller is not going to work if I just
connect 36V DC to the plus and minus terminals of the speed
controller?

I suspect at least one of the terminals coming from the battery pack
is to monitor the lithium-ion battery temperature (probably help keep
it from exploding). I don't know what the others are for.

Maybe I'll have to buy a matching battery pack instead of using my own
(36V, 3.5AH), or maybe I'll bypass the speed controller and go
directly to the motor. But I'd rather use their speed controller even
with its tiny heat sink.

Can't find DeWalt's amp hour rating for their 36V lithium-ion battery
packs, lots of hype about the technology though.

Thank you.

It's not clear what (or why) you want to do. Why don't you want to
use the battery pack that came with the drill? If you're looking for
a backup battery, just get one like the one that came with the drill.

Mark

 

[John Doe]

It's not clear what (or why) you want to do.

I could have been clearer about not having a battery pack for the
DeWalt DC900 cordless drill. I bought the bare tool from eBay without
a battery pack or charger.

Why don't you want to use the battery pack that came with the drill?
If you're looking for a backup battery, just get one like the one
that came with the drill.

I bought two different Panasonic drills so I could use some of their
juicy 3.5 amp hour 12V batteries (4 total) for my project (with
whatever cordless drill motor). Then I saw the 36V DeWalt (tool only)
and thought that's perfect. Unfortunately it has a PWM with about
eight inputs that probably must be satisfied somehow. So if I can't
find the data for that PWM motor speed controller, looks like I will
be selling one of the Panasonic drills and buying a battery/charger
for the DeWalt motor. Or maybe I can find a suitable replacement PWM.

Yes, using a matching DeWalt battery (light but volatile lithium-ion)
might be the way to go. Would be nice if DeWalt provided amp hour
ratings for their batteries, but maybe their users aren't considered
technically inclined enough to understand that.

Thanks.

 

[redbelly]

Would be nice if DeWalt provided amp hour
ratings for their batteries, but maybe their users aren't considered
technically inclined enough to understand that.

Thanks.

I did some browsing around. Amazon.com lists a 2.4 A-hr spec on the
Dewalt 36V battery:

http://www.amazon.com/s/ref=nb_ss_g...ps&field-keywords=dc9360&Go.x=10&Go.y=8&Go=Go

Pretty expensive suckers ($170 at amazon, and $100 for a charger),
especially if you wanted to get a 2nd battery. Looks like this tool
is meant for professional contractors.

Good luck,

Mark

 

[John Doe]

....

I did some browsing around. Amazon.com lists a 2.4 A-hr spec on the
Dewalt 36V battery:

http://www.amazon.com/s/ref=nb_ss_g...ps&field-keywords=dc9360&Go.x=10&Go.y=8&Go=Go

Great, I missed that, thanks.

Pretty expensive suckers ($170 at amazon, and $100 for a charger),

There aren't any other standard use cordless drills at 36V either. I
think the next biggest is a Milwaukee 28V right angle drill.

The DeWalt lithium-ion batteries and charger are not nearly that
expensive on eBay. The way I see it, people buy the kits on sale
wherever they can get them and then break up the kits. Apparently you
can get stuff like batteries and chargers much cheaper (at certain
times) than you would pay for the replacement charger or battery
normally sold separately.

 

[John B]

On 13/07/2007 John Doe wrote:

..
..
..

There aren't any other standard use cordless drills at 36V either. I
think the next biggest is a Milwaukee 28V right angle drill.

Yes there are, at least on this side of the pond:


http://www.screwfix.com/app/sfd/cat/pro.jsp;jsessionid=TM5INF2NTKTGOCSTH
ZPCFFA?cId=100372&ts=26691&id=24048

Don't know it it's avaialable in the US though.

 

[neon]

Your problem is lithium battery must maintain current charging voltage charging temperature and so forth all those wire are there to maintain the lithium battery . YES you can supply the main power to run the drill but if you do make a mistake and blow the charger controller then you will end up with more trouble then replacing the expensive battery. In other word you will not be able to get back to day one.