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Correct DC motor size/power?

J

John Doe

Jan 1, 1970
0
No. There is no general motor in your photo.

It is an 18 VDC motor, from a DeWalt right angle drill.
It looks like a solenoid actuator. Is it? Bogging down is not a
general term.

The word "bog" is a common United States English term, usually
used with the word "down". It means "it is being impeded, it
should be running faster".
Be specific.

Maybe I will stick a multimeter on it and measure current while in
use.
--
 
S

Spehro Pefhany

Jan 1, 1970
0
Generally speaking. If the DC motor being used is bogging down at
times, will using a slightly more powerful DC motor actually use less
power?

Yes. Compare torque vs. efficiency curves of the two motors.


Best regards,
Spehro Pefhany
 
E

ehsjr

Jan 1, 1970
0
John said:
Generally speaking. If the DC motor being used is bogging down at
times, will using a slightly more powerful DC motor actually use less
power? If you want details, no problem, it's for my next push stick.

http://www.flickr.com/photos/27532210@N04/
http://www.flickr.com/photos/27532210 N04/ (sign removed)

Thanks.

From the photos, it looks like you are capable of excellent
construction. Make sure that part of that construction is
using fat conductors from the battery and switch to the motor.
When a motor bogs down it draws more current, which creates a
greater voltage drop in the conductors. The bigger the
conductor, the lower the voltage drop. I have no idea what
is practical for your design, but I'd use the biggest size
copper wire that you can in your machine. If the connections
to the battery or motor are getting hot, you are dropping
voltage at those points, too. Some amount of heating cannot
be avoided, but the better the connection, the less heat will
be produced, and the lower the voltage drop.

Perfecting the construction of the electrical path from the
battery to the motor is something you may have already done.
If not, doing that will be beneficial, regardless of which
motor (or battery) you use.

Ed
 
S

StickThatInYourPipeAndSmokeIt

Jan 1, 1970
0
Yes or No, depending on the magnitudes of "slightly" and "bogging".
The deWalt motor sizes might be 0.5 hp, 1 hp, 1.5 hp so the magnitude
of "slightly" might be 50%. The magnitude of "bogging" is not
measurable with common garage instruments.

So, essentially you have not much, if not zero real experience.

If you torque load one of said motors, it (they) can typically 'grind
through' the load (do I need to explain that one to you as well?), if the
battery is running low, OR the torque load too high, the motor will 'BOG
DOWN', nearing zero rpm, and approaching the current limits of the
windings..

Only a complete retard would fail to comprehend the term, or a fresh
out of school, zero experience ditz. OR some math inclined dopey dork
that cannot function without running a formula through his 'wee bwain',
always failing to catch parasitic effects or numerous other elements of
the scenario by getting stuck on their own worse than layman grasp of
common use terms. Maybe you also need to look up the word GRASP.

The problem did not require any quantisization whatsoever. Solving it,
does however. require at least a slight GRASP of the real world and the
terms those of us that work within it use.

Since I do not 'see' you backing out of the enormous shit pile you just
created and then went swimming in, I have no way of knowing if you will
ever 'get it'. Get it? Yet? Word boy? Instead of spending your time
criticizing a query, you should have spent some time trying to actually
grasp what was being asked.

Since I doubt you'll change direction, as the mass of stubborn skull
bone is quite high, and your weakness suggests that you will not, you can
simply FOAD.
 
T

TheGlimmerMan

Jan 1, 1970
0
From the photos, it looks like you are capable of excellent
construction. Make sure that part of that construction is
using fat conductors from the battery and switch to the motor.
When a motor bogs down it draws more current, which creates a
greater voltage drop in the conductors. The bigger the
conductor, the lower the voltage drop. I have no idea what
is practical for your design, but I'd use the biggest size
copper wire that you can in your machine. If the connections
to the battery or motor are getting hot, you are dropping
voltage at those points, too. Some amount of heating cannot
be avoided, but the better the connection, the less heat will
be produced, and the lower the voltage drop.

Perfecting the construction of the electrical path from the
battery to the motor is something you may have already done.
If not, doing that will be beneficial, regardless of which
motor (or battery) you use.

Ed


Excellent observation (observational skill) and cons ice post
(observational presentation) regarding it!

Something you have consistently done in the groups you frequent, and
some folks that remain in Usenet still miss a lot. Good post.

I would only suggest that like some of the robot folks have found, even
though some may argue against the claim, SPC (Silver plated Copper) might
grab a few more percentage bits of efficiency.

In fact, instead of one large SPC wire, several hand bundled smaller
guys together end up giving more Silver in the path, and a bit better
(Litz like even)pulse response. May the arguments ensue.
 
M

Martin Riddle

Jan 1, 1970
0
John Doe said:
Thanks for the compliment.

ehsjr is right on target. The RC electric plane guys use heavy guage
wire, 12awg? maybe 10. And that’s for very short runs of 2 - 6".
Helps to eliminate the voltage drop so the motor sees more power, and
perhaps a little longer run time.

Cheers
 
S

StickThatInYourPipeAndSmokeIt

Jan 1, 1970
0
is this a flame, that i have heard rumours about? very entertaining.
there is one point with which exception may be taken: when you
referenced "nearing zero rpm" it seems that this is implied to be an
asymptotic approach and not a complete stoppage. is that accurate?


This from the fucktard that is so fucking dumb that he thought he was
looking at a solenoid, and then answered talking about a solenoid.

You're an idiot. What part of **** Off And Die do you not understand?
 
E

ehsjr

Jan 1, 1970
0
TheGlimmerMan said:
Excellent observation (observational skill) and cons ice post
(observational presentation) regarding it!

Something you have consistently done in the groups you frequent, and
some folks that remain in Usenet still miss a lot. Good post.

Thanks. His project is intriguing. On a good day, I could fill
a thimble with what I know about inline skating - maybe. :)
The idea of "driving" on them powered by a small rechargeable
source & tool motor is fascinating. I hope he'll post more.
I would only suggest that like some of the robot folks have found, even
though some may argue against the claim, SPC (Silver plated Copper) might
grab a few more percentage bits of efficiency.

In fact, instead of one large SPC wire, several hand bundled smaller
guys together end up giving more Silver in the path, and a bit better
(Litz like even)pulse response. May the arguments ensue.

Let's hope not. There's often too much argument, and too little
discussion. :-(

Ed
 
J

John Doe

Jan 1, 1970
0
Thanks. His project is intriguing. On a good day, I could fill
a thimble with what I know about inline skating - maybe. :) The
idea of "driving" on them powered by a small rechargeable source
& tool motor is fascinating. I hope he'll post more.

I plan to post more pictures over however many months it takes,
starting with making it lighter and/or more powerful.
--
 
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