Need information about this Motor ?

[iugmoh]

oky today I made some expeiments on the motor, I opened it and I determined the the two wires connected to brushes to be the armature coil using digital multimeter, then also determined the two wires for the field coil, then I connected them on series and applied DC voltage and it rotated without any problems, but the strange thing is the other two wires rest I don't know for what they are , I measure the ohm resistance between them which is 0.8 ohm but between the armature about 5.6 ohm and between the field 2.9 ohm , and also the cross sectional area of the armature and field are the same but for the other two wires (0.8 ohm ) is lesser than the armature and filed wire.

I applied a small voltage on these two wires (0.8 ohm) but this make sparking.
I measured the DC voltage and ac voltage between them during rotation of motor but the reading always is zero.

so what may be the purpose of these two wires ?

[skimask]

so what may be the purpose of these two wires ?

Back lighting?

Seriously...it might be that you have to apply a small voltage to one of these wires in order to get a tach output from the other one... Who knows...

[iugmoh]

may be, but I think that this motor is for a vechile and there was a controller to control each whell alone , my be these two wires is to control any wheel to to stop it inorder to stop one and rotate one to change the direction of vechile. the strange thing also in these twol wheels is when I rotate any of these two wheels in any direction the other rotate in the oposite direction.

[skimask]

may be, but I think that this motor is for a vechile and there was a controller to control each whell alone , my be these two wires is to control any wheel to to stop it inorder to stop one and rotate one to change the direction of vechile. the strange thing also in these twol wheels is when I rotate any of these two wheels in any direction the other rotate in the oposite direction.

Not strange...normal. There's like an open differential in between the 2 just like most rear wheel drive automobiles...

And the whole direction changing thing is most likely NOT done inside the motor.

[iugmoh]

may be, but I think that this motor is for a vechile and there was a controller to control each whell alone , my be these two wires is to control any wheel to to stop it inorder to stop one and rotate one to change the direction of vechile. the strange thing also in these twol wheels is when I rotate any of these two wheels in any direction the other rotate in the oposite direction.

sory I mean by this when I rotate by hand but when apply dc voltage the two wheels are rotated in the same direction

[skimask]

sory I mean by this when I rotate by hand but when apply dc voltage the two wheels are rotated in the same direction

Which is exactly the way an 'open differential' on a rear wheel drive car works.
Google it...

[iugmoh]

thanks alot skimask for your interesting information, I learn new things about open differential , I read it but I can't distinguish between straight and turn mechanisms and what happened and what is the thing make this machanisms straight or turn.

http://auto.howstuffworks.com/differential2.htm

[skimask]

thanks alot skimask for your interesting information, I learn new things about open differential , I read it but I can't distinguish between straight and turn mechanisms and what happened and what is the thing make this machanisms straight or turn.

http://auto.howstuffworks.com/differential2.htm

It is a bit difficult to picture without actually seeing it in operation.
Take the gear case cover off if you can, turn it and play with it.
As soon as you see it in operation, it'll all make sense...(or maybe go to an auto mechanic shop and see if they've got one to show you or something)

EDIT: I just took another look at the pictures in post #1. An open diff is exactly what it looks like to me. The motor input is slightly offset from center, the round bump on the one side is for the large bevel/ring gear, probably driven off a center mounted reduction gear setup, the spiders and side gear are probably mounted in the middle.
You never did mention exactly what this motor was from. I could be a wheelchair setup as long as it has a sort separate steering motor, unless the brakes actually accomplish the steering.

[Archangel]

thanks alot skimask for your interesting information, I learn new things about open differential , I read it but I can't distinguish between straight and turn mechanisms and what happened and what is the thing make this machanisms straight or turn.

http://auto.howstuffworks.com/differential2.htm

Picture 2 half circles, for instance #1 having a radias of 500mm and #2 having a radias of 400mm, and both having the same exact center. now imagine those 2 half circles represent the tracks left by the wheels. the inner wheel travels a shorter distance than the outer wheel does. That is the purpose of the "open differential" . Does your motor have 1 set of 2 or 2 sets of 2 brushes? BTW a brushed motor is commonly referred to as a Universal motor as it can operate from A/C or D/C.

[Archangel]

thanks alot skimask for your interesting information, I learn new things about open differential , I read it but I can't distinguish between straight and turn mechanisms and what happened and what is the thing make this machanisms straight or turn.

http://auto.howstuffworks.com/differential2.htm

In an automotive differential, you have 4 pinions or "spider gears" 2 of which are attached to either axle. the other two are driven by the carrier through the common shaft which goes through the carrier. The carrier is driven by an attached Ring and Pinion set which allows for a 90 degree change in direction of power. the 4 pinions or spider gears are in constant mesh and as the assembly is rotated by the carrier around the axles axis, it allows the axles to turn at a constantly changing ratio from zero difference to 100% difference depending upon the load applied to each. If one wheel loses traction that wheel will spin wildly, while the other wheel remains motionless.

[mackrackit]

so what may be the purpose of these two wires ?

I still think there is a good chance it is a compound motor.
http://www.joliettech.com/connections_dc_motors.htm
and yes the motor might turn with out the series winding hooked up, and yes if you applied voltage directly to these lead it very well could become skimasks backlight

Here is some fun reading, the second half is DC.
http://www.reliance.com/mtr/mtrthrmn.htm

[Archangel]

I still think there is a good chance it is a compound motor.
http://www.joliettech.com/connections_dc_motors.htm
and yes the motor might turn with out the series winding hooked up, and yes if you applied voltage directly to these lead it very well could become skimasks backlight

Here is some fun reading, the second half is DC.
http://www.reliance.com/mtr/mtrthrmn.htm

You may well be right! Time to disassemble and inspect to see what he has, I hope he has some experience with brushes and commutators.