What are the common faults of the commutator? How to disassemble?
The commutator is an important part of the DC motor and the AC variable speed motor. It is divided into two categories: ordinary commutator and plastic commutator. Ordinary commutator structure
The common faults of the commutator are as follows.
1 commutator short between the pieces.
2 commutator grounding.
3 commutator fly (jump) piece and deformation.
4 The lifting piece is loose or broken.
5 The surface of the commutator is scratched or worn.
When the commutator is damaged and needs to be repaired, it must be removed. When disassembling, firstly enclose a layer of elastic paper with a thickness of 0.5 to 1 mm on the commutator for gasket insulation, and then use a wire with a diameter of 1.2 to 2 mm to make a coil or a hoop, and tighten the ring and reversing. Mark the relative position between the sheets, then loosen the nut and remove the V-shaped pressure ring. If the V-shaped pressure ring is too tight, you can pad a laminate and then evenly tap the end face of the V-shaped pressure ring with a small hammer. After loosening, it can be removed. After the sleeve and another V-shaped pressure ring are taken out, the commutator segments, the V-groove surface and the V-shaped mica ring can be inspected and repaired accordingly.
Usually the mica sheet is pasted on the commutator and needs to be uncovered with a knife. The mica fines on the commutator should also be scraped off. If the knife marks are scratched, they can be polished on both sides with a medium-grade abrasive cloth. The intact mica sheets are retained to measure the thickness with a micrometer. The mica sheet generally has a thickness of 0.5 to 1.0 mm, a width of about 60 mm, and a length of about 90 mm. The mica end ring should also be retained as a sample for making a new mica ring.
