FIELD: electrical engineering. SUBSTANCE: small-sized motor rotor that has shaft mounting commutator, coil varistor, and ring building up magnetic tension to hold spherical surface of shaft tight against thrust bearing, is characterized in that coil is wound on commutator built up of laminations with projecting portions joined together by means of themoplastic compound. Commutator has slot receiving varistor. End portions of mentioned coil are placed above projecting parts of commutator and shaft is double-step structure. Manufacturing process for this rotor involves winding of coil groups onto cylindrical mandrel followed by their molding. Prior to winding onto mandrel, commutator is installed with its slot accommodating varistor electrically connected with commutator laminations, then coil sections are wound from wire covered with thermoplastic adhesive layer on mandrel, with end portions above projecting parts of commutator, by means of easily removable arbor. In the course of winding, coil leads immediately wound on projecting laminations of commutator and then winding is blown down with hot air for short time not over 20 s for pre-holding of winding turns on mandrel. Rotor is removed from mandrel and mounted on other one heated to 100-150 C; hollow cylinder heated to same temperature is gradually fitted onto coil. Entire assembly is then heated to not lower than 150 C and rotor is held at this temperature for to not lower than 150 C and rotor is held at this temperature for at least 15 min depending on rotor design; then rotor is cooled down to 20 60 C and removed from mandrel; coil leads and commutator laminations are soldered. EFFECT: simplified design of commutator and rotor as a whole; facilitated procedure, reduced labour consumption. 2 cl, 2 dwg
