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

In article ,
Daniel Rudy wrote:

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.

At about the time of 10/16/2008 5:51 AM, Smitty Two stated the following:
In article ,
Daniel Rudy wrote:

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

In article ,
Daniel Rudy wrote:
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 London SW
To e-mail, change noise into sound.

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

In article ,
Daniel Rudy wrote:
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?

Think the way they are connected - series or parallel - makes a difference
to the motor characteristics. Also separate access to the field can make
speed control easier.

--
*Everybody lies, but it doesn't matter since nobody listens*

Dave Plowman London SW
To e-mail, change noise into sound.