Level 3 sparks are allowed. The cause of the jumping spark on the commutator, Japan HD brush harmonic drive FHA-25C-50-E250-C is a sliding contact defects, the second is caused by the defects of the circuit and magnetic circuit for the reasons of the sliding contact defects caused by the jumping spark:



) The brush is not installed correctly. The degree of the jumping spark on the commutator can be divided into:

I} All or part of the brush sparks, Japan HD brush harmonic drive FHA-25C-50-E250-C the whole collector device heat. This is mainly brush varieties are not good, brush is too soft or too hard, brush size is not appropriate, brush is too wide or too narrow, cover commutation piece number is too little, and the number of brush, small section, etc.; On the other hand, due to the brush in the brush grip with inappropriate, Japan HD brush harmonic drive FHA-25C-50-E250-C can not slide freely. It is not easy to install, even swing, brush pressure is too large, too small, brush grinding is not good, brush rack installation is inconsistent.