D.C motor spark treatment
1. Before operating, checking below:
a. Checking the rectification electrical resource, requiring: rectification pulse quantity not less than 6, at rated speed, rated armature voltage and rated load state, the phase controlling factor not lower than 8.5%, the peak wave factor not exceed 6%.
b. Checking if the brush at medium position, moving the brush frame, let the C.W and A.C.W rotation speed difference lower than 1%.
c. Checking the brush brand is D374N or better type brush, who’s controlling the spark ability should be very well, the brush can be moving smoothly in the brush holder, the spring pressure should be in effect.
d. Checking the brush to commutator contacting face area need exceed 75%, the brush can not be abrased to at limited data.
e. Checking the distance between brush to commutator, requiing not exceed 3mm.
2. If have spark too, disassembly machine and checking.
a. Checking if commutator moving to one side, the working moving center value not exceed 0.05mm.
b. Checking if commutator chamfer well, if the slot have brush dust, the chamfer drawing as follow: