US 4,227,107 AGranted

Direct current motor with double layer armature windings

OwnerItsuki Ban, Manabu Shiraki +1inventors

InventorsItsuki Ban, Manabu Shiraki, Kazuhito Egami

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Abstract

A direct current motor, having armature windings superposed on each other in double layers, is provided with a fixed field magnet having 2 mn poles (m being a positive integer of 1 or more, n a positive integer of 2 or more) magnetized alternately to N and S polarities in equal angular spaces, a magnetic material member for closing the magnetic path of the field magnet, rotating shaft supported by bearings provided in the housing of the motor, and an armature secured to the shaft for rotation in the magnetic path facing to the field magnet poles. A first series of m(2n-1) armature windings mounted on the armature are juxtaposed side by side at equal pitches, the angular spacing between the conductor portions of the windings, which contribute to generate torque, being equal to the angular width of the field magnet pole. A second series of m(2n-1) armature windings mounted on the armature are juxtaposed side by side at equal pitches, the angular spacing between the conductor portions of the windings of the second series, which contribute to generate torque, being equal to the angular width of the field magnet pole. The first series of armature windings and the second series of armature windings are superposed on each other and are disposed, with respect to each other, out of phase by 1/(2n-1) of the angular width of the field magnet pole.

Claims2

Dependent claims

An improved direct current motor having an armature and armature windings for intersecting a magnetic path of a field magnet, said armature windings superposed on each other in double layers, wherein the improvement comprises:

a field magnet having 2 mn poles arranged peripherally at equal angular spacings and alternately magnetized to N and S polarities wherein m is a positive integer equal to or greater than 1 and n is a positive integer equal to or greater than 2;
a magnetic material for closing the magnetic path of said field magnet;
a first series of m(2n-1) armature windings mounted on said armature so that said windings are juxtaposed side-by-side at equal pitches, each said winding having conductor portions for generating torque which are angularly spaced from each other a distance equal to the angular width of each said field magnet pole;
a second series of m(2n-1) armature windings mounted on said armature so that said windings of the second series are juxtaposed side-by-side at equal pitches, each said winding of the second series having conductor portions for generating torque which are angularly spaced from each other a distance equal to the angular width of each said field magnet pole, and
the first series of m(2n-1) armature windings and the second series of m(2n-1) armature windings being interconnected and superposed on each other and having a phase shift with respect to each other equal to 1/(2n-1) of the angular width of each said field magnet pole.

2 more elements

Dependencies are inferred from the claim text.