Armature coil conductor and method of manufacture therefor
First Claim
1. An armature coil conductor for a direct-current motor having straight portions which fit into slots in an armature core and corresponding lead portions, disposed at ends of said straight portions, which are to be connected by ultrasonic welding to commutator segments arranged parallel to a circumference of an armature core, characterized in that said lead portions have oval cross sections such that dimensions of the oval cross sections of said lead portions parallel to the circumference of the armature are smaller than dimensions of cross sections of said corresponding straight portions parallel to the circumference of said armature.
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Accused Products
Abstract
The lead portions have oval cross sections such that the dimensions of the cross sections of the lead portions parallel to the circumference of the armature are smaller than those of the straight portions parallel to the circumference of the armature are. Preferably, the cross-sectional area of the lead portions may be substantially equal to that of the straight portions. The lead portions may have circular cross sections such that the cross-sectional diameter of the lead portions is smaller than that of the straight portions. The method of manufacture for an armature coil conductor comprises the steps of working, which may be ironing preferably, the ends of the straight portions so that the lead portions have oval cross sections. Preferably, the working performed on the ends of the straight portions may comprise inserting a plurality of the straight portions into the slots in the armature core; overlapping a plurality of the lead portions and forming pairs of lead portions comprising an upper lead and a lower lead; and simultaneously ironing the pairs of lead portions by passing the pairs of lead portions through a die having a plurality of die holes capable of ironing the pairs of lead portions simultaneously.
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Citations
17 Claims
- 1. An armature coil conductor for a direct-current motor having straight portions which fit into slots in an armature core and corresponding lead portions, disposed at ends of said straight portions, which are to be connected by ultrasonic welding to commutator segments arranged parallel to a circumference of an armature core, characterized in that said lead portions have oval cross sections such that dimensions of the oval cross sections of said lead portions parallel to the circumference of the armature are smaller than dimensions of cross sections of said corresponding straight portions parallel to the circumference of said armature.
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5. A motor comprising:
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an armature core; a rotating shaft which rotates about a central axis; a commutator segment; and an armature coil conductor having a first portion which is connected to said commutator segment and a second portion which is connected to said armature core; wherein a first cross section of said first portion, made in a first plane perpendicular to the central axis, has a first dimension taken in a radial direction of said armature which is larger than a second dimension of the first cross section taken in a direction perpendicular to the first dimension; and wherein a second cross section of said second portion, made in a second plane perpendicular to the central axis, has a corresponding third dimension taken in a direction perpendicular to the radial direction of said armature which is larger than the second dimension. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A motor comprising:
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an armature core; a rotating shaft which rotates about a central axis; a commutator segment; and an armature coil conductor having a first portion which is connected to said commutator segment and a second portion which is connected to said armature core; and wherein a maximum dimension of a cross section of said first portion, made in a first plane perpendicular to the central axis, is larger than a maximum dimension of a cross section of said second portion made in a second plane perpendicular to the central axis. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification