three pole electric motors

[Solace]

does anybody know how to set up the brushes on a three pole electric motor? I know how to do it on a 2 pole motor, but i can't figure out how its done on a three - pole one. please, this has been bothering me all week.

[camtunkpa]

I don't remember how to set the brushes right off hand but I have done it before I need to check my notes and to see if I can find my old book from motors class. I'll let you know when I find out.

Cliff
222 Alum.

[scuba_sm]

I have had limited expierence with Three-pole motors.... I have played with a few DC stepper motors though, and depending on the type, they can have three contacts, could this be what you're using? There is an excellent book out called "The Robot Builder's Bonanza" and not only does it tell you how to wire up various types of motors, including that type, but it has a wealth of other information on various subjects, including drivetrain design, programming, etc. I think it well worth the investment.

[sanddrag]

Originally posted by scuba_sm
There is an excellent book out called "The Robot Builder's Bonanza" and not only does it tell you how to wire up various types of motors, including that type, but it has a wealth of other information on various subjects, including drivetrain design, programming, etc. I think it well worth the investment.

My copy is sitting right here on my desk.

[ZACH P.]

Originally posted by sanddrag
My copy is sitting right here on my desk.

Which version?

I have both. That book was the first book I ever owned on robotics, and it has been invaluable. I would recommend it to all but the most advanced of robot builders.

[sanddrag]

Originally posted by ZACH P.
Which version?

I have both. That book was the first book I ever owned on robotics, and it has been invaluable. I would recommend it to all but the most advanced of robot builders.

I have the second edition. Sitting below is my Basic Stamp manual and above is my WM Berg catalog. I love my desk.

I had a Parallax Boe-Bot book too, to go along with the robot but I'm not sure where the book is. They've got it online though along with a lot of other great material in PDF form.

[Adam Y.]

I have had limited expierence with Three-pole motors.... I have played with a few DC stepper motors though, and depending on the type, they can have three contacts, could this be what you're using?

Well since he used the word brushes I doubt it would be a stepper motor. Unless he meant something else.

[Matt Reiland]

http://electronics.howstuffworks.com/motor3.htm

[Solace]

that doesn't actually show you how to set one up though, it just says that they are better.

[Matt Reiland]

Whoops Sorry,

This link shows a 2 brush 3 pole taken apart & operation

http://solarbotics.net/starting/2001..._dcmotor2.html

[Al Skierkiewicz]

Originally posted by Solace
does anybody know how to set up the brushes on a three pole electric motor? I know how to do it on a 2 pole motor, but i can't figure out how its done on a three - pole one. please, this has been bothering me all week.

Jake,
I am not sure what you are asking here. The brushes for a three pole motor are the same as for a two pole motor. i.e.180 degrees apart. The commutator is something else again. In simple motors there are three contacts on the commutator roughly 120 degrees apart, with each winding wired to two of the three. If one brush is in contact with the center of a commutator segment, then the other brush in contact with both of the remaining segments. This puts one winding into a north/south the second winding into a south/north and the third winding is shorted out. Both energized windings then attract their opposite magnetic poles and spin the motor. When the brushes contact only two segments, then two of the coils are in series (half the current but twice the magnetic field of one coil alone) and the third winding is in parallel with the first two but opposite polarity. Does that answer your question?