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US 6,552,467 B1Granted
Integral noise filter within brush of electric motor
AssigneeValeo Electrical Systems, Inc.
InventorsCandace R. Suriano, John R. Suriano
Life of this patent
Estimating the term…
Abstract
A noise-suppression system for brush-type electric motors in vehicles. A capacitor, together with an inductor, are integrally constructed into a carbon brush, forming an LC filter.
Claims13
A brush for an electric motor, comprising:
- a) a block for contacting a commutator;
- b) a plurality of conductors extending from the block;
- and
- c) a conductive sheath surrounding each conductor and connected to ground,
- wherein at least two of said plurality of conductors forms a capacitor.
2 more elements
A brush for an electric motor, comprising:
- a) a first contact for contacting a commutator in the motor and a second contact in opposed relation to the first contact, said first contact and said second contact both comprising substantially the same cross-sectional shape and each of said first and second contacts comprising a shape that substantially complements the shape of a passageway of a brush box into which the brush will be positioned;
- b) an inductor connected between said first and second contacts;
- and
- c) a block of material which
- i) supports and couples said first and second contacts and
- ii) encases said inductor.
3 more elements
A brush for an electric motor, comprising:
- a) a contact for contacting a commutator in the motor;
- b) an inductor connecting with said contact, and
- c) a block of material which
- i.) supports said contact and
- ii.) encases said inductor;
- and
- wherein said inductor comprises a coil of wire surrounding a core having a relative permeability exceeding a permeability of air.
4 more elements
A brush for an electric motor, comprising:
- a) a first contact for contacting a commutator in the motor and a second contact in opposed relation to the first contact, said first contact and said second contact both comprising substantially the same cross-sectional shape and each of said first and second contacts comprising a shape that substantially complements the same of a passageway of a brush box into which the brush will be positioned;
- b) an inductor connected between said first and said second contacts;
- c) a block of material which
- i.) supports and couples said first and second contacts and
- ii.) encases said inductor;
- and
- d) a capacitor which
- i.) connects between said contact and an external lead and
- ii.) is encased in said block.
6 more elements
A brush for an electric motor, consisting essentially of:
- a) a first contact for contacting a commutator with a motor and a second contact in opposed relation to the first contact, said first contact and said second contact both comprising a shape that substantially complements the shape of a passageway of a brush box into which the brush will be positioned;
- b) a power connector (PIG);
- c) an LC noise filter for deterring noise signals received by the contact from reaching the power connector;
- and
- d) a matrix supporting and coupling said first and second contacts, power connector, and LC noise filter.
2 more elements
A method of constructing a brush for a motor, comprising the following steps:
- a) providing a contact for contacting a commutator;
- and
- b) attaching a filter, comprising an inductor and a capacitor, to the contact in a manner which precludes usage either the inductor or the capacitor individually in another radio-frequency circuit.
A brush assembly for an electric motor, comprising:
- a) a generally dumbbell-shaped brush, having two ends of large diameter, connected by a shaft of small diameter;
- b) a mass of ferrite-bearing material surrounding the shaft;
- c) a brush box within which the brush is slidably engaged, which includes
- i) a conductive region which is capacitively coupled to ground;
- and
- ii) an insulative region.
3 more elements
A brush assembly for an electric motor, comprising:
- a) a generally dumbbell-shaped brush, having two ends of large diameter, connected by a shaft of small diameter;
- b) a mass of ferrite-bearing material surrounding the shaft;
- c) a brush box within which the brush is slidably engaged, which includes
- i) a conductive region;
- and
- ii) an insulative region.
3 more elements
Dependencies are inferred from the claim text.