servomotor problem

[Alex S.A]

Ok .. Thanks for all guidance i have received from you. They increase my acknowledge about motor and equipments.

[Alex S.A]

Hu ... In one direction the motor works fine but in oppositive direction the motor does not move. it stay stoped.

[Al_The_Man]

If there is resitance to movement by rotating the shaft by hand, then try with the brushes out, then it look like you may have to have to at least take one of the endcovers off to see if you can visually see anything. If it is like Hu said that one of the stator pole pieces have come loose, they can be cemented back in place by a high grade epoxy product, if you find that is what you have to do, I can give you the name of one I use. The ferrite pole pieces are not at all porous so it takes a good adhesive to work.
Al

[Mariss Freimanis]

You have one bridge power transistor blown-out.

Mariss

[ViperTX]

Mariss,

That is only true if when he reverses the armature windings the motor turns in the direction that was suspect, then you can say that 1/2 of the bridge is blown. Since he has changed to known good drivers the problem is with the motor.

Paul