THIS SEMICONDUCTOR DEVICE COMPRISES: A SEMICONDUCTOR LAYER HAVING A MAIN SURFACE; A FIRST CONDUCTIVE-TYPE WELL REGION FORMED ON A SURFACE LAYER PORTION OF THE MAIN SURFACE OF THE SEMICONDUCTOR LAYER; A FIRST CONDUCTIVE-TYPE FIRST IMPURITY REGION FORMED ON A SURFACE LAYER PORTION OF THE WELL REGION AND HAVING AN INNER WALL PORTION; AND A SECOND CONDUCTIVE-TYPE ANNULAR SECOND IMPURITY REGION FORMED ON THE SURFACE LAYER PORTION OF THE WELL REGION INSIDE THE INNER WALL PART SO AS TO FORM A PN JUNCTION WITH THE WELL REGION.

Title:

Document Type and Number:

WIPO Patent Application WO/2022/137862

Kind Code:

A1

Abstract:

The present invention comprises: a stator core (2X) around which a plurality of coils (2Z) are wound; a stator case (2W) that supports the stator core (2X); a rotor core (4X) disposed to be rotatable relative to the stator core (2X) with a gap (7) therebetween; a rotor case (4W) that supports the rotor core (4X); and a first bearing (11A) and a second bearing (11B) that connect the stator case (2W) and the rotor case (4W). Rolling elements (10) of the first bearing (11A) and the second bearing (11B) and coil end parts of the coils (2Z) are arranged in a liquid refrigerant path (15) in which a liquid refrigerant is accommodated. The gap (7) serves as a first flow path through which the liquid refrigerant flows in an axial direction. The first bearing (11A) is disposed on the upstream side of the first flow path. The second bearing (11B) is disposed on the downstream side of the first flow path. The inner diameter of the second bearing (11B) is greater than the inner diameter of the first bearing (11A).

Inventors:

SUTO TETSUYA (JP)
TAKAHASHI AKESHI (JP)
ITO MAKOTO (JP)

Application Number:

PCT/JP2021/041431

Publication Date:

June 30, 2022

Filing Date:

November 10, 2021

Export Citation:

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Assignee:

HITACHI LTD (JP)

International Classes:

H02K9/19; B60K7/00; H02K5/173

Foreign References:

JP2009148047A	2009-07-02
JPH10322974A	1998-12-04
JPH02186119A	1990-07-20
JP2011030307A	2011-02-10
JPH10274244A	1998-10-13
JP2005016681A	2005-01-20

Attorney, Agent or Firm:

KAICHI IP (JP)

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