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US 5,015,905 AGranted
DC dynamoelectric machine with interpoles having magnetic flux bypassing members
AssigneesHitachi, Ltd., Hitachi Setsubi Engineering Co., Ltd.
InventorsHaruo Koharagi, Kazuo Tahara, Mitsuhiro Nitobe, Nobutaka Suzuki
Life of this patent
Estimating the term…
Abstract
A DC dynamoelectric machine with interpoles between field poles operable in sparkles even under heavy operating conditions comprising a solid soft iron magnetic flux bypassing members, each disposed between respective field poles and interpoles at their ends near its armature with an air gap between the field pole for controlling interpole magnetic flux, the solid soft iron magnetic flux bypassing member suppresses sudden change of magnetic flux flowing therethough by permitting flow of eddy current therethrough and maintains the interpole magnetic flux at a desired amount even during a sudden change of load current.
Claims9
A DC dynamoelectric machine comprising:
- a stator including an annular yoke;
- a plurality of field poles each fastened to an inside of said annular yoke and having a field pole piece and a field winding surrounding said field pole piece;
- a plurality of interpoles each disposed between said field poles, fastened to the inside of said annular yoke and having an interpole piece and an interpole winding surrounding said interpole piece;
- an armature and an commutator rotatably disposed within said stator;
- a brush assembly supported through said stator and slidably contacting said commutator;
- and
- a plurality of magnetic flux bypassing members, each disposed between said field pole pieces and said interpole pieces at respective ends thereof near said armature, wherein each of said magnetic flux bypassing members include an element of magnetic material which permits eddy current flow therein during magnetic flux variation so as to suppress a sudden change of leakage magnetic flux flowing through said plurality of magnetic flux bypassing members in at least one of a direction from said field pole pieces to said interpole pieces and a direction from said interpole pieces to said field pole pieces.
4 more elements
A DC dynamoelectric machine comprising:
- a stator including an annular yoke;
- a plurality of field poles each fastened to an inside of said annular yoke and having a field pole piece and a field winding surrounding said field pole piece;
- a plurality of interpoles each disposed between said field poles, fastened to the inside of said annular yoke and having an interpole piece and an interpole winding surrounding said interpole piece;
- an armature and a commutator rotatably disposed within said stator;
- a brush assembly supported through said stator and slidably contacting said commutator;
- and
- a plurality of magnetic flux bypassing members, each disposed between said field pole pieces and said interpole pieces at respective ends thereof near said armature, wherein each of said magnetic flux bypassing members include an element of magnetic material which permits eddy current flow therein during magnetic flux variation so as to suppress a sudden change of leakage magnetic flux flowing through said plurality of magnetic flux bypassing members;
- wherein said plurality of magnetic flux bypassing members are supported by said plurality of interpole pieces and magnetically coupled to said plurality of field pole pieces through an air gap having a predetermined length, and the length of said air gap is between 2 mm and 15 mm.
5 more elements
A DC dynamoelectric machine comprising:
- a stator including an annular yoke
- a plurality of field poles each fastened to an inside of said annular yoke and having a field pole piece and a field winding surrounding said field pole piece;
- a plurality of interpoles each disposed between said field poles, fastened to the inside of said annular yoke and having an interpole piece and an interpole winding surrounding said interpole piece;
- an armature and a commutator rotatably disposed within said stator;
- a brush assembly supported through said stator and slidably contacting said commutator;
- and
- a plurality of magnetic flux bypassing members, each disposed between said field pole pieces and said interpole pieces at respective ends thereof near said armature, each of said magnetic flux bypassing members being made of magnetic material and electric current conductive material which bypasses magnetic flux and permits eddy current flow generated by leakage magnetic flux flowing through said plurality of magnetic flux bypassing members in at least one of a direction from said field pole pieces to said interpole pieces and a direction from said interpole pieces to said field pole pieces.
4 more elements
Dependencies are inferred from the claim text.