| 摘要 |
936,621. Electric motors having planar airgaps and printed windings. SOC. D'ELECTRONIQUE ET D'AUTOMATISME. Jan. 8, 1960 [Jan. 8, 1959], No. 832/60. Class 35. In a flat annular air-gap electric motor, Figs. 9, 10, constructed to operate in a step-bystep fashion by sequentially feeding current to parts of its rotor 50 whereof the stator 51 comprises a number of pairs of poles N, S arranged in a circle and the rotor, Figs. 2 . . . 4, comprises two sets of half-turn conductors 20, 35 printed over the opposite faces of either a single or a respective insulating disc 34 and interconnected by conducting bridges 26, 27 to form a complete multipolar winding, the motor includes two groups of commutator members respectively secured to the stator and rotor and consisting of a plurality of conductive arcuate segments 28, 29 arranged in two concentric rings mutually displaced by half a pole pitch and brushes 30, 31 bearing against the segments and arranged in pairs spaced apart by one pole pitch and in two concentric rings whereby the motor steps when an electrical source 15 is switched across pairs of successive commutator members in the stator group alternately from one to the other ring in the group. Either the segments are on the stator and the brushes are included in the rotor and permanently connected to the winding terminals or, as shown, vice versa. The rotor winding may be lap wound as shown or wave wound, Fig. 8 (not shown), and comprise outer and inner inclined portions 22, 23 ending in terminals 24, 25 formed simultaneously with the segments which alternatively may co-operate with the inner terminals 25. Damping of the rotor at each approach to a stopping position is achieved by an apertured copper or aluminium disc 32 applied via an insulating disc 36 to a face of the winding, and the assembly has a rigid magnetic and insulating carrier plate 37 and is united by a thermosetting glue or resin 38. In modifications the disc 32 is between the halfwindings or is in two portions axially outside the windings, and the segments may be applied over the windings, with intervening insulation. The stator poles are created by either electro- or permanent magnets. Specifications 874,394 and 902,295 are referred to.
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