Stator for electric rotating machine and method of manufacturing same
First Claim
1. A stator for an electric rotating machine, the stator comprising:
- a hollow cylindrical stator core having a longitudinal axis and a plurality of slots that are formed in a radially inner surface of the stator core and spaced in a circumferential direction of the stator core; and
a stator coil formed of a plurality of electric wires mounted on the stator core,whereineach of the electric wires forming the stator coil has only first, second, third, . . ., nth sequential in-slot portions and only first, second,. . ., (n−
1)th sequential turn portions, where n is an integer not less than 4,the first to the nth in-slot portions are sequentially received in p of the slots of the stator core, where p is an integer not greater than n,the first to the (n−
1)th turn portions are alternately located on opposite axial sides of the stator core outside of the slots to connect corresponding adjacent pairs of the first to the nth in-slot portions,all of the radial distances of the first to the nth in-slot portions from the axis of the stator core successively decrease,for all of the electric wires forming the stator coil, the first in-slot portions are located most radially outward and the nth in-slot portions are located most radially inward in the slots of the stator core, and all of the electric wires are offset from one another in the circumferential direction of the stator core.
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Accused Products
Abstract
A stator includes a stator core and a stator coil comprised of a plurality of electric wires. Each of the electric wires has, at least, first, second, and third in-slot portions and first and second turn portions. The first to third in-slot portions are respectively received in three different slots of the stator core. The first turn portion is located on one axial side of the stator core outside of the slots to connect the first and second in-slot portions. The second turn portion is located on the other axial side of the stator core outside of the slots to connect the second and third in-slot portions. For each of the electric wires, the radial distances of the first to third in-slot portions from the axis of the stator core successively decrease. All of the electric wires are offset from one another in the circumferential direction of the stator core.
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Citations
17 Claims
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1. A stator for an electric rotating machine, the stator comprising:
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a hollow cylindrical stator core having a longitudinal axis and a plurality of slots that are formed in a radially inner surface of the stator core and spaced in a circumferential direction of the stator core; and a stator coil formed of a plurality of electric wires mounted on the stator core, wherein each of the electric wires forming the stator coil has only first, second, third, . . ., nth sequential in-slot portions and only first, second,. . ., (n−
1)th sequential turn portions, where n is an integer not less than 4,the first to the nth in-slot portions are sequentially received in p of the slots of the stator core, where p is an integer not greater than n, the first to the (n−
1)th turn portions are alternately located on opposite axial sides of the stator core outside of the slots to connect corresponding adjacent pairs of the first to the nth in-slot portions,all of the radial distances of the first to the nth in-slot portions from the axis of the stator core successively decrease, for all of the electric wires forming the stator coil, the first in-slot portions are located most radially outward and the nth in-slot portions are located most radially inward in the slots of the stator core, and all of the electric wires are offset from one another in the circumferential direction of the stator core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of manufacturing a stator for an electric rotating machine,
wherein the stator comprises a hollow cylindrical stator core and a stator coil mounted on the stator core, and the stator core has a longitudinal axis and a plurality of slots that are formed in a radially inner surface of the stator core and spaced in a circumferential direction of the stator core, the method comprising the steps of: -
shaping a plurality of electric wires into a wave shape so that each of the wave-shaped electric wires has only first, second, third, . . . , nth sequential in-slot portions and only first, second, . . . , (n−
1)th sequential turn portions, where n is an integer not less than 4, the first to the nth in-slot portions are sequentially received in p of the slots of the stator core, where p is an integer not greater than n, the first to the (n−
1)th turn portions are alternately located on opposite axial sides of the stator core outside of the slots to connect corresponding adjacent pairs of the first to the nth in-slot portions, all of the radial distances of the first to the nth in-slot portions from the axis of the stator core successively decrease, for all of the electric wires forming the stator coil, the first in-slot portions are located most radially outward and the nth in-slot portions are located most radially inward in the slots of the stator core, and all of the electric wires are offset from one another in the circumferential direction of the stator core;stacking the wave-shaped electric wires one by one to form a band-shaped electric wire assembly; rolling the band-shaped electric wire assembly into a hollow cylindrical shape to form the stator coil; and assembling the stator coil with the stator core to form the stator.
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Specification