Rotary machine and manufacturing method therefor

• US 5,886,444 A
• Filed: 01/29/1997
• Issued: 03/23/1999
• Est. Priority Date: 01/30/1996
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hiramatsu, Hiromichi, Enomoto, Yuji, Yamamoto, Noriaki, Taneda, Yukinori
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): WILLIAMS, TIMOTHY A J
• Application Number:
  US08/789,431
• Time in Patent Office: 783 Days
• Field of Search: 310/208, 310/206, 310/200, 310/207, 310/179, 310/260, 310/261
• US Class Current: 310/208
• CPC Class Codes: H02K 3/12 arranged in slots

Abstract

The present invention is characterized in that a rotary machine attempts to lower the resistance of each coil and realize improvement of efficiency and miniaturization of a motor by shortening the end portion of a coil to be inserted into a stator, and the constitution thereof is that the coil end portion of a stator coil has a shape that a conductor raised and looped back from a slot provided in the core on the rotor side is closer to the end face of the aforementioned core than a conductor raised and looped back in the aforementioned slot on the opposite side of the rotor, and the aforementioned constitution has a stator coil having a loopback shape passing a location other than above the adjacent slot surface.

The present invention is also a method for manufacturing a rotary machine characterized in that the coil end portion of a stator coil is held horizontally by a holding member, and the holding member is rotated by finely moving the rotational center from the rotor side to the opposite side of the rotor with the slot insertion portion provided in the core restricted, and the aforementioned coil end portion is formed in the loopback shape.

Claims

1. A rotary machine comprising:

a stator having a stator core;

a rotor; and

a stator coil inserted into slots of said stator core, said stator coil including, in each slot, a Plurality of conductors aligned in a radial direction;

wherein a coil end portion of said stator coil has a shape that one of said plurality of conductors raised and looped back from a slot provided in said stator core on the rotor side is closer to the end face of said stator core than another of said plurality of conductors raised and looped back in the slot on the opposite side of the rotor.

3. A rotary machine according to claim 1 or 2, wherein said rotary machine is a motor.

4. A rotary machine according to claim 1 or 2, wherein said rotary machine is a generator.

2. A rotary machine comprising:

a stator having a stator core;

a rotor; and

a stator coil inserted into slots of said stator core, said stator coil including, in each slot, a plurality of conductors aligned in a radial direction;

wherein a coil end portion of said stator coil has a shape that one of said plurality of conductors raised and looped back from a slot provided in said stator core on the rotor side is closer to the end face of said stator core than an other of said plurality of conductors raised and looped back in said slot on the opposite side of the rotor and has a loopback shape passing a location other than above the adjacent slot surface.