Help identifying motor leads.

Posted by Daniel Rudy on October 16, 2008, 3:52 am

Cross Post: sci.electronics.repair, comp.robotics.misc

*****

Hello Groups,

I have recently acquired two heavy duty motors for robotics use. Below
is a link to the picture of one of them.

http://www.mpja.com/prodinfo.asp?number=14386+MD

I have both a left hand and a right hand motor. They are about a foot
long, half a foot wide, and weigh in at about 40 lbs each (No wonder it
cost $40 for shipping...UPS ground even.). The motor also has
serviceable brushes too. There are four wires for these motors, colors
red, black, white, and yellow. I'm going to assume that red and black
are power, but what are the white and yellow for? A built in
tachometer? The gearing is bolted on, but there doesn't appear to be
any way to dismantle the motor so I can see how it is wired internally.
Any thoughts or suggestions?

--
Daniel Rudy

Email address has been base64 encoded to reduce spam
Decode email address using b64decode or uudecode -m

Posted by Smitty Two on October 16, 2008, 8:51 am

> Cross Post: sci.electronics.repair, comp.robotics.misc
>
> *****
>
> Hello Groups,
>
> I have recently acquired two heavy duty motors for robotics use. Below
> is a link to the picture of one of them.
>
> http://www.mpja.com/prodinfo.asp?number=14386+MD
>
> I have both a left hand and a right hand motor. They are about a foot
> long, half a foot wide, and weigh in at about 40 lbs each (No wonder it
> cost $40 for shipping...UPS ground even.). The motor also has
> serviceable brushes too. There are four wires for these motors, colors
> red, black, white, and yellow. I'm going to assume that red and black
> are power, but what are the white and yellow for? A built in
> tachometer? The gearing is bolted on, but there doesn't appear to be
> any way to dismantle the motor so I can see how it is wired internally.
> Any thoughts or suggestions?

Two of the wires for the armature, two for the field.

Posted by Daniel Rudy on October 16, 2008, 5:11 pm

At about the time of 10/16/2008 5:51 AM, Smitty Two stated the following:

>> Cross Post: sci.electronics.repair, comp.robotics.misc
>> *****
>> Hello Groups,
>> I have recently acquired two heavy duty motors for robotics use. Below
>> is a link to the picture of one of them.
>> http://www.mpja.com/prodinfo.asp?number=14386+MD
>> I have both a left hand and a right hand motor. They are about a foot
>> long, half a foot wide, and weigh in at about 40 lbs each (No wonder it
>> cost $40 for shipping...UPS ground even.). The motor also has
>> serviceable brushes too. There are four wires for these motors, colors
>> red, black, white, and yellow. I'm going to assume that red and black
>> are power, but what are the white and yellow for? A built in
>> tachometer? The gearing is bolted on, but there doesn't appear to be
>> any way to dismantle the motor so I can see how it is wired internally.
>> Any thoughts or suggestions?

>
> Two of the wires for the armature, two for the field.

A DC motor that has a field winding? I need to find a way inside these
motors...

--
Daniel Rudy

Email address has been base64 encoded to reduce spam
Decode email address using b64decode or uudecode -m

Posted by Dave Plowman (News) on October 16, 2008, 7:04 pm

> > Two of the wires for the armature, two for the field.

> A DC motor that has a field winding? I need to find a way inside these
> motors...

Older car starter motors had field windings - called series wound. Maximum
torque at stall. Will also run on AC.

--
*I started out with nothing... and I still have most of it.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

Posted by Daniel Rudy on October 16, 2008, 7:29 pm

At about the time of 10/16/2008 4:04 PM, Dave Plowman (News) stated the
following:

>>> Two of the wires for the armature, two for the field.

>> A DC motor that has a field winding? I need to find a way inside these
>> motors...

>
> Older car starter motors had field windings - called series wound. Maximum
> torque at stall. Will also run on AC.
>

Interesting.

I have some additional information. The black and white wires are
connected to brushes. The DC resistance between the two is about 2.7
ohms. The red and yellow wires have a DC resistance of 7.3 ohms. So I
guess they can be wires either series or parallel. What I don't
understand is if the red and yellow wires are for the field, then why
bring them out? Why not just connect them internally?

--
Daniel Rudy

Email address has been base64 encoded to reduce spam
Decode email address using b64decode or uudecode -m

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