Stator and rotating electric machine

Patent metadata

Field	Value
Publication number	US-9847684-B2
Application number	US-201314069677-A
Country	US
Kind code	B2
Filing date	Nov 1, 2013
Priority date	Nov 2, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A stator includes a hollow cylindrical stator core and a stator coil. The stator core has a plurality of slots formed therein. The stator coil is provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core, and includes a first winding and a second winding. The first winding extends around the stator core so as to be located at the (2n−1)th and 2nth layers of the stator coil, and has an end located at the 2nth layer, where n is a natural number. The second winding extends around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, and has an end located at the (2n+1)th layer. The ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other.

First claim

What is claimed is:

1. A stator comprising:
a hollow cylindrical stator core having a plurality of slots formed therein, the slots being arranged in a circumferential direction of the stator core at predetermined intervals; and
a stator coil provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core,
wherein
the stator coil includes a first winding and a second winding,
the first winding extends around the stator core by two turns so as to be located at the (2n−1)th and 2nth layers of the stator coil counting from a radially outer side of the stator coil, where n is a natural number, the first winding having an end located at the 2nth layer,
the second winding extends around the stator core by two turns so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, the second winding having an end located at the (2n+1)th layer,
the ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other,
each of the first and second windings is formed by connecting a plurality of electric conductors inserted in the slots of the stator core,
each of the first and second windings includes a plurality of in-slot portions, which are received in corresponding ones of the slots of the stator core, and a plurality of turn portions that connect adjacent pairs of the in-slot portions and are located outside of the slots of the stator core,
the ends of the first and second windings are electrically connected to each other via an irregular-shaped electric conductor that is different in shape from the electric conductors forming the first and second windings,
the irregular-shaped electric conductor protrudes axially outward from both the first and second windings,
the stator coil is configured as a multi-phase coil to include a plurality of phase windings,
each of the phase windings includes the first and second windings,
for every 2m layers of the stator coil, there are formed terminals at the ends of the first and second windings of the phase windings, where m is a natural number, and
the phase windings are connected into one of a Y-connection, a Δ connection and a Y-Δ connection by connecting corresponding pairs of the terminals.

2. The stator as set forth in claim 1 , wherein each of the turn portions of the first and second windings is stair-shaped so that the turn portion has a maximum protruding height from a corresponding axial end face of the stator core at a center of the turn portion.

3. The stator as set forth in claim 2 , wherein each of the stair-shaped turn portions of the first and second windings includes a plurality of steps, and
each of the steps has a height substantially equal to a thickness of the electric conductors forming the first and second windings.

4. The stator as set forth in claim 1 , wherein each of the electric conductors forming the first and second windings is configured to include an electrically-conductive metal member having a substantially rectangular cross section and an insulating coat that covers the metal member.

5. The stator as set forth in claim 1 , wherein each of the turn portions of the first and second windings has a crank-shaped portion formed therein.

6. A rotating electric machine comprising the stator as set forth in claim 1 and a rotor that is rotatably disposed in radial opposition to the stator.

7. The stator as set forth in claim 1 , wherein for each of the first and second windings, the in-slot portions of the winding are spaced from one another at equal intervals in the circumferential direction of the stator core.

8. The stator as set forth in claim 1 , wherein the two turns around the stator core of the first winding are electrically continuous, and the two turns around the stator core of the second winding are electrically continuous.

9. A stator comprising:
a hollow cylindrical stator core having a plurality of slots formed therein, the slots being arranged in a circumferential direction of the stator core at predetermined intervals; and
a stator coil provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core,
wherein
the stator coil includes a first winding and a second winding,
the first winding extends twice around the stator core so as to be located at the (2n−1)th and 2nth layers of the stator coil counting from a radially outer side of the stator coil, where n is a natural number, the first winding having an end located at the 2nth layer,
the second winding extends twice around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, the second winding having an end located at the (2n+1)th layer,
the ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other;
the first winding extends a first time around the stator core at the (2n−1)th layer and then electrically in series with a second time around the stator core at the 2nth layer, and the second winding extends a first time around the stator core at the (2n+1)th layer and then electrically in series with a second time around the stator core at the (2n+2)th layer.

Assignees

• Denso Corp

Inventors

• Suzuki Hideaki
• Seguchi Masahiro
• Takahashi Yuki

Classifications

• H02K3/14

  with transposed conductors, e.g. twisted conductors · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title