oddball motor
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Posts: 46,084
i found this motor at a surplus store with the following label on it:
PITTMAN
GMT9413D242
17.8 VDC
127.7:1 RATIO
1-8-88
Most of which is just fine but there are apparently two motors in one package.
One smaller one on the back of a larger one on the back of a still larger
gearbox. Each motor has a set of
two wires coming out. they are both reversible and respond to dc, and each set
will make the output shaft spin by itself. Anybody know what this sort of thing
is used for?
thanks,
raphael
PITTMAN
GMT9413D242
17.8 VDC
127.7:1 RATIO
1-8-88
Most of which is just fine but there are apparently two motors in one package.
One smaller one on the back of a larger one on the back of a still larger
gearbox. Each motor has a set of
two wires coming out. they are both reversible and respond to dc, and each set
will make the output shaft spin by itself. Anybody know what this sort of thing
is used for?
thanks,
raphael
Comments
tachometer? Remember a motor and a generator are really the same thing.
Electricity generates movement and movement generates electricty. So while
one motor is spinning, the other generates a voltage that tells you the
speed.
Lots of interesting two-sided coins around like that. For example, the
Kelvin effect and the Peltier effect.
Big bonus question: How is a transformer like a generator? Hint: If you know
the answer, you know why they don't work at DC.
Regards,
Al Williams
AWC
* Easy RS-232 prototyping http://www.al-williams.com/awce/rs1.htm
Original Message
From: raphael [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=9exBRLxTNDHuKyQNmDL2_Q0gdVTe5q1ildNNZcLdznchWkWr8kVfl7n_wgfjGOCMmgrGpyTB4RAHvw]raphael@w...[/url
Sent: Monday, October 15, 2001 11:39 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] oddball motor
i found this motor at a surplus store with the following label on it:
PITTMAN
GMT9413D242
17.8 VDC
127.7:1 RATIO
1-8-88
Most of which is just fine but there are apparently two motors in one
package. One smaller one on the back of a larger one on the back of a still
larger gearbox. Each motor has a set of
two wires coming out. they are both reversible and respond to dc, and each
set will make the output shaft spin by itself. Anybody know what this sort
of thing is used for?
thanks,
raphael
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(not the hobby type). It is coupled to the main driven motor and works like
a generator. The tachometer generates a voltage proportional to the rpm of
the driven motor. This signal is input to the servo driver/amplifier. As
the servo experiences load changes the tachometer signal also changes. The
servo driver/amplifier which monitors this tachometer signal will then
increase or decrease power as required to maintain the commanded rpm.
The servo driver/amplifier is between the MCU, PC, PLC, BasicStamp or
whatever is controlling the system and the servo motor. It receives a
command signal from the MCU and then provides the actual drive current to
the motor.
Regards,
Mike Witherspoon
Original Message
From: raphael [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RipIv5QzhUjxFK4SWiXCAXMENPFRl5ubZAro7Jj1Ax3LYMMmOFHAtRnDZRZNZxNNEaQ3TlEtWFZrAPA]raphael@w...[/url
Sent: Monday, October 15, 2001 9:40 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] oddball motor
i found this motor at a surplus store with the following label on it:
PITTMAN
GMT9413D242
17.8 VDC
127.7:1 RATIO
1-8-88
Most of which is just fine but there are apparently two motors in one
package. One smaller one on the back of a larger one on the back of a still
larger gearbox. Each motor has a set of
two wires coming out. they are both reversible and respond to dc, and each
set will make the output shaft spin by itself. Anybody know what this sort
of thing is used for?
thanks,
raphael
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
for crude speed control or some such. One probably produces lots
of torque the other not as much. Another option may be a heavy
motor to set something in motion and a lighter one to keep it in
motion once it is started without using so much current.
Just ideas. . .
Doug
On 15 Oct 2001, at 12:39, raphael wrote:
>
>
> i found this motor at a surplus store with the following label on it:
>
> PITTMAN
>
> GMT9413D242
> 17.8 VDC
> 127.7:1 RATIO
> 1-8-88
>
> Most of which is just fine but there are apparently two motors in one
> package. One smaller one on the back of a larger one on the back of a
> still larger gearbox. Each motor has a set of two wires coming out.
> they are both reversible and respond to dc, and each set will make the
> output shaft spin by itself. Anybody know what this sort of thing is
> used for?
>
> thanks,
> raphael
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject
> and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
feedback generator. It certainly will work for that purpose. The real question
is: why would anyone use a feedback system capable of producing nearly as much
force as the drive motor? I guess that's why this one is an oddball!
thanks all,
raphael
>being a feedback generator. It certainly will work for that purpose. The
>real question is: why would anyone use a feedback system capable of
>producing nearly as much force as the drive motor? I guess that's why this
>one is an oddball!
>
>thanks all,
>raphael
Just a thought... perhaps they are both generators. I'm thinking of GYM
exercise
bike equipment, where your pedaling powers the unit while "braking" takes
effect
as your simulated bike ride goes up and down hills. A unit as you describe
with
two "motors" could be configured to operate in this mode I suppose.
Beau Schwabe IC Mask Designer
National Semiconductor Wired Communications Division
500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071