Cooling structure of generator

• US 20030075996A1
• Filed: 08/06/2002
• Published: 04/24/2003
• Est. Priority Date: 12/11/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Yoshida, Shiro, Ogita, Hiroshi
• Granted Patent: US 6,710,479 B2
• Time in Patent Office: Days
• US Class Current: 310/58
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium
• CPC Class Codes: H02K 2201/03 Machines characterised by aspects of the air-gap between rotor and stator
• CPC Class Codes: H02K 5/203 specially adapted for liquids, e.g. cooling jackets
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 9/04 having means for generating a flow of cooling medium
• CPC Class Codes: H02K 9/19 for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• CPC Class Codes: H02K 9/20 wherein the cooling medium vaporises within the machine casing

Abstract

Cooling oil passes through a cooling oil passage (28) in the inside of an iron core (7), and cools the inside of the iron core (7). Further, cooling air passes through a cooling air passage (31) in the inside of the iron core (7) and a clearance (5) between the internal periphery of the iron core (7) and the external periphery of a rotor (4), and cools the inside of the iron core (7) and the rotor (4). Therefore, it is possible to effectively cool the internal periphery side of a stator (6) and the rotor (4). When a cooling oil is sprayed from the cooling oil passage (28) into the cooling air passage (31), it is possible to obtain a more effective cooling effect by utilizing the latent heat of vaporization of the mist of the cooling oil.

Claims

1. A cooling structure in a generator,

the generator comprising a casing, a rotor accommodated in the casing and rotatably supported in the casing, and a stator accommodated in the casing and disposed with a clearance around the rotor,

the stator constructed of an iron core having a large number of steel sheets laminated, and a coil wound around the iron core, wherein

the casing is provided with a cooling oil entrance and a cooling oil exit respectively, and

the iron core is provided with a cooling oil passage that passes through inside of the iron core and is communicated to between the cooling oil entrance and the cooling oil exit.

4. The cooling structure in a generator according to any one of claims 1 to 3, wherein

the cooling oil passage and the cooling air passage are formed by combining several kinds of the steel sheets provided by press processing several kinds of holes and/or grooves.

2. A cooling structure in a generator,

the generator comprising a casing, a rotor accommodated in the casing and rotatably supported in the casing, and a stator accommodated in the casing and disposed with a clearance around the rotor,

the stator constructed of an iron core having a large number of steel sheets laminated, and a coil wound around the iron core, wherein

the casing is provided with a cooling air entrance and a cooling air exit respectively, and

the iron core is provided with a cooling air passage that passes through inside of the iron core and is communicated to between the cooling air entrance and the cooling air exit via a clearance between an internal periphery of the iron core and an external periphery of the rotor.

3. A cooling structure in a generator,

the generator comprising a casing, a rotor accommodated in the casing and rotatably supported in the casing, and a stator accommodated in the casing and fixed with a clearance around the rotor,

the stator constructed of an iron core having a large number of steel sheets laminated, and a coil wound around the iron core, wherein

the casing is provided with a cooling oil entrance, a cooling oil exit, a cooling air entrance, and a cooling air exit respectively, and

the iron core is provided with a cooling oil passage that passes through inside of the iron core and is communicated to between the cooling oil entrance and the cooling oil exit, and a cooling air passage that passes through the inside of the iron core and is communicated to between the cooling air entrance and the cooling air exit via a clearance between an internal periphery of the iron core and an external periphery of the rotor.