The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2026
Filed:
Jul. 25, 2022
Hitachi Astemo, Ltd., Hitachinaka, JP;
Yuri Fujima, Tokyo, JP;
Masahiro Hori, Tokyo, JP;
Takaki Itaya, Hitachinaka, JP;
Hideaki Goto, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
The purpose of the present invention is to provide a rotary electrical machine having improved cooling performance. A rotary electrical machine according to the present invention comprises: a stator; a rotor; and a cooling passage through which a refrigerant for cooling the statorand the rotorflows. The cooling passage is provided with: a refrigerant inletthrough which the refrigerant is introduced; stator cooling passagesin communication with the refrigerant inlet; a rotor cooling passage; and a connection passagewhich connects the stator cooling passageswith the rotor cooling passage. The rotor cooling passageis provided with refrigerant outletsthrough which the refrigerant is discharged radially outside the rotorin association with rotational motion of the rotor. A plurality of the stator cooling passagesare arranged in the circumferential direction of a stator core. The terminal end of each of the stator cooling passagesis connected to the upstream side of the connection passageat a position opposite to the refrigerant inletin the axial direction and in the circumferential direction.