Abstract: A thin type DC brushless motor comprises a permanent magnet rotor, a stator core which is arranged concentrically with the rotor, and stator coils which are wound on the stator core. The stator core is so configured as to include a ring-shaped core portion which surrounds the permanent magnet of the rotor and which has a thickness substantially equal to the axial thickness of the permanent magnet, and a plurality of coil winding core portions which extend radially outwardly from the outer periphery of the ring-shaped core portion, which have a thickness less than the thickness of the ring-shaped core portion and which serve to dispose the stator coils thereon. The ring-shaped core portion is formed with notches so as to leave salient interpole portions disposd upon sides of the respective coil winding core portions as viewed in the rotating direction of the rotor, on front and rear surfaces of the coil winding core portions as viewed in the direction of the permanent magnet.

Abstract: A small capacitor motor comprises a rotor, a stator core disposed in concentric relationship with the rotor and stator coils wound on the stator core. The stator core comprises a ring-shaped core part, surrounding the core of the rotor and having an axial thickness substantially equal to the axial thickness of the core of the rotor. A plurality of coil winding core parts each radially extends from the periphery of the ring-shaped core part and has an axial thickness less than the axial thickness of the ring-shaped core part. The stator coils are mounted on these radial extensions.

Abstract: A gas detecting and monitoring device comprises a bridge circuit including a gas detecting element and a constant-current circuit for feeding a constant current to the gas detecting element. The device further comprises a compensating bridge circuit including at least a part of the gas detecting element. The compensating bridge circuit produces a signal corresponding to the variation of the resistance value of the gas detecting element depending upon the variation of the ambient temperature and feeds the signal to the constant-current circuit to automatically control the current fed to the bridge circuit thereby maintaining the resistance value of the gas detecting element at a constant value. The device may further comprise a correcting circuit including a temperature sensor for sensing the variation of the ambient temperature disposed near the gas detecting element.

Abstract: A small shaded-pole motor comprises a rotor, stator core disposed in concentric relationship with the rotor, stator coils wound on the stator core and shading coils disposed in the vicinity of the stator core. The stator core consists of two generally rectangular plates each having a ring-shaped projection formed by stamping and swaging. The ring-shaped projections extend in a direction perpendicular to the plane of the plates. The height of the ring-shaped projections at their inner side is equal to about a half of the thickness of said rotor in its axial direction. The two plates are assembled together back to back so that their ring-shaped projections define a cylindrical space for the rotor. The stator coils are mounted on the portions of the back to back assembled plates other than their ring-shaped projections.