Title: Direct-current micromotor

Abstract: A direct-current micromotor is disclosed which comprises a rotor bearing a motor winding, the rotor being arranged for rotation between a core part and a mantle part of a stator structure. The core part comprises a permanent magnet and the mantle part is made of magnetically conductive material. The motor winding is fed through a commutator comprising a collector and associated brushes. At least a part of the surfaces of the stator facing the rotor winding are provided with an electrically conductive coating to reduce the height of the voltage peaks occuring during the commutation.

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Inventors: Aubert, Francois (Boudry, CH)
Heyraud, Marc (Coffrane, CH)

Application Number: 773328
Filing Date: 1977-03-01
Publication_date: 1979-01-23
Assignee: Portescap (La Chaux-de-Fonds, CH)
Primary Class(es): 310/220 310/154.04, 310/266
Other Classes:
US Patent Ref:

2667591	Jan, 1954	Gindroz	310/45.
3163788	Dec, 1964	Powers	310/45.
3591815	Jul, 1971	Grootenhuis et al.	310/27.

Other Refs: 789725

Jan, 1958	GB

Primary Examiner: Duggan, Donovan F.
Assistant Examiner:
Attorney: Cushman, Darby & Cushman