Slow-speed small synchronous motor - has rotor formed by two opposing interfitting sheet metal shells

摘要

The motor has a stator with a coaxial coil and separate flux paths for the non-phase-shifted and the phase-shifted magnetic fluxes. The rotor is surrounded by the stator and the main part of it is formed as two half shells (18,19) of sheet iron or steel placed opposite to one another so that their side edges overlap and are pressed together. The rotor has a hub (16) for transmission of the torque on either side, made of iron or steel, against which one or more discs (20, 21) are pressed to exert a radial pressure on the hub (16). Two sheet steel discs (20,21) are employed each having radial lugs (i) which fit into corresponding cut-outs in the inner rotor shell (19). Both the inner and outer rotor shells (19,20) are also formed of sheet iron or steel.