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US 5,714,822 AGranted
Coil for electric machine and manufacturing method thereof
AssigneeNippondenso Co., Ltd.
InventorsYusuke Kawano, Mitsuyuki Hayashi
Life of this patent
Estimating the term…
Abstract
A magnet wire having generally round cross section is taken out from a wire pack and formed by a forming roller mechanism into a polygonal shape in cross section to be wound on a bobbin tightly, thereby increasing the space factor of a coil. Then, magnet wire having round cross section is wound in a portion where pressure may be applied from the outside. Since the round wire is easy to move and able to dodge the pressure, a reliable coil of a high space factor can be obtained.
Claims5
A coil for an electric machine comprising:
- a cylindrical bobbin having a cylindrical surface and a pair of flexible insulating flanges disposed at opposite sides of said cylindrical surface;
- a magnet wire comprising:
- a first portion having a generally polygonal cross-section wound on said cylindrical surface closely to other segments of said first portion to form a tight winding layer, and
- a second portion integrally series-connected to said first portion having a generally round cross-section and approximately a same sectional area as said first portion wound on said first portion to form a loose winding layer, wherein
- said magnet wire of said loose winding layer moves when an outside pressure is applied thereto via said flexible insulating flanges.
2 more elements
A field coil for an alternator for an automobile having a Lundell type rotor comprising:
- a cylindrical bobbin having a cylindrical surface and a pair of flexible insulating flanges disposed at opposite sides of said cylindrical surface, said bobbin being disposed in said Lundell type rotor;
- a magnet wire comprising:
- a first portion having a generally rectangular cross-section wound on said cylindrical surface closely to other segments of said first portion to form a tight winding layer, and
- a second portion integrally series-connected to said first portion having a generally round cross-section and a same sectional area as said first portion wound on said first portion to form a loose winding layer, wherein
- said magnet wire of said loose winding layer moves to release pressure applied thereto when said cylindrical bobbin with said magnet wire is inserted in said Lundell type rotor.
2 more elements
Dependencies are inferred from the claim text.