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US 6,114,792 AGranted
Commutator motor with a magnetic field deflecting moving charge carriers in the commutator brush
AssigneeSiemens Aktiengesellschaft
InventorPeter Tiemeyer
Life of this patent
Estimating the term…
Abstract
In order to reduce the wear on the brushes (6) and thus extend the operating lives of the brushes and of the commutator motor, brush sparking on the trailing edges (6.2) of the brushes (6) is reduced a commutation magnetic field (M), produced for example by an additional magnet (4) placed axially behind the brushes (6), such that the magnetic field (M) deflects the moving charge carriers in the brushes (6), to thereby reduce the current density at the trailing edges (6.2) of the brushes (6).
Claims17
A commutator motor, comprising:
- a commutator arranged to rotate in a main rotation direction;
- a brush which presses against said commutator in a longitudinal, contact-pressure direction, and through which an operating current flows essentially in the longitudinal, contact-pressure direction;
- wherein said brush has a leading edge and a trailing edge relative to the main rotation direction of said commutator;
- and
- an arrangement that produces a commutation magnetic field that is aligned essentially at a right angle to the longitudinal, contact-pressure direction in which the operating current flows;
- wherein charge carriers that are moved by the operating current are deflected by the commutation magnetic field so as to reduce a current density of the operating current on the trailing edge of said brush.
3 more elements
A commutator motor, comprising:
- a commutator arranged to rotate in a main rotation direction;
- a brush comprising a leading edge and a trailing edge relative to the main rotation direction of said commutator, wherein said leading edge and said trailing edge contact said commutator, and wherein an operating current flows through said brush;
- and
- a magnet producing a commutation magnetic field that deflects charge carriers moved by the operating current from said trailing edge of said brush.
1 more element
Dependencies are inferred from the claim text.