The so-called short circuit between the commutator segments means that there is a short-circuit connection between two adjacent commutator segments on the commutator, and the commutator segments are short-circuited. Large sparks will appear on the surface of the commutator; when the short circuit is serious, ring fire will occur on the surface of the commutator.
The repair of the short circuit between the commutator segments is as follows:
①Cleaning with slot cleaning piece: When the armature winding is burnt due to a short-circuit fault, the fault point can be found by observation. Therefore, in order to determine whether the short-circuit fault occurs inside the winding or between the commutator segments, the The winding wire head connected to the commutator segment is disconnected, and then use the check light to check whether there is a short circuit between the commutator segments. Chips, brush powder, corrosive substances, etc., until the check light is used to check that there is no short circuit. And use mica powder and shellac or mica powder, epoxy resin and polyamide resin (650) to mix into a paste, then fill in the grooves and let it harden and dry.
②Clean the V-groove and V-ring of the commutator group: If the inter-chip short circuit cannot be eliminated after careful removal of external inter-chip debris. At this time, the commutator must be disassembled, and the V-groove and V-ring of the commutator group must be carefully cleaned. Before disassembling the commutator, wrap a layer of elastic paper with a thickness of 0.5 to 1 mm on the outer circumference of the commutator for insulation, and mark the fault location, and then cover the stacking die, and then Take the commutator apart. Further check the faults between the commutator segments, the surface of the V-groove and the V-ring, and deal with them according to different faults.
③ Replacement of mica sheets between sheets If the short circuit between sheets cannot be eliminated by the above method, only the mica sheets can be replaced.