Cooling of an axial end region of a stator in a rotating electrical machine
US-2017353064-A1 · Dec 7, 2017 · US
Rotating Electrical Machine, Compressor System, and Pump System
US2019109514A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2019109514-A1 |
| Application number | US-201816124373-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 7, 2018 |
| Priority date | Oct 10, 2017 |
| Publication date | Apr 11, 2019 |
| Grant date | — |
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- Title
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Abstract
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A rotating electrical machine includes a rotating electrical machine body including a stator, a rotor, a fan configured to circulate a coolant for cooling the stator and the rotor, and a casing containing the stator, the rotor and the fan; and a cooler connected to the rotating electrical machine body. The coolant flows from the machine body into the cooler. The cooler cools the coolant. The coolant flows out of the cooler into the machine body. The cooler has a flow resistance Ra satisfying a relation 0.15<(Ra/Rm)<(P 0 /P 1 ), wherein Ra is a flow resistance of the coolant in the cooler, Rm is a flow resistance of the coolant in the rotating electrical machine body, P 0 is a shutoff pressure of the fan, and P 1 is a pressure at an operating point of the fan when the flow resistance Ra of the cooler is assumed to be zero.
First claim
Opening claim text (preview).
What is claimed is: 1 . A rotating electrical machine comprising: a rotating electrical machine body including a stator, a rotor, a fan configured to circulate a coolant for cooling the stator and the rotor, and a casing containing the stator, the rotor and the fan; and a cooler connected to the rotating electrical machine body, the cooler allowing the coolant to flow from the rotating electrical machine body into the cooler, the cooler cooling the coolant, and the cooler allowing the coolant to flow out of the cooler into the rotating electrical machine body, wherein the cooler has a flow resistance Ra that satisfies a relation 0.15<(Ra/Rm)<(P 0 /P 1 ), wherein Ra is a flow resistance of the coolant in the cooler, wherein Rm is a flow resistance of the coolant in the rotating electrical machine body, wherein P 0 is a shutoff pressure of the fan, and wherein P 1 is a pressure at an operating point of the fan when the flow resistance Ra of the cooler is assumed to be zero. 2 . A rotating electrical machine comprising: a rotating electrical machine body including a stator, a rotor, a fan configured to circulate a coolant for cooling the stator and the rotor, and a casing containing the stator, the rotor and the fan; and a cooler connected to the rotating electrical machine body, the cooler allowing the coolant to flow from the rotating electrical machine body into the cooler, the cooler cooling the coolant, and the cooler allowing the coolant to flow out of the cooler into the rotating electrical machine body, wherein the cooler has a pressure loss ΔPa that satisfies a relation 0.15<(ΔPa/(Pd−ΔPa))<(P 0 /P 1 ), wherein Pd is a pressure at an operating point of the fan at a rated air volume of the coolant, wherein ΔPa is a pressure loss of the cooler at the rated air volume of the coolant, wherein Ra is a flow resistance of the coolant in the cooler, wherein P 0 is a shutoff pressure of the fan, and wherein P 1 is a pressure at an operating point of the fan when the flow resistance Ra of the cooler is assumed to be zero. 3 . A compressor system comprising: a compressor; and a motor for the compressor, wherein the motor is the rotating electrical machine according to claim 1 . 4 . A pump system comprising: a pump; and a motor for the pump, wherein the motor is the rotating electrical machine according to claim 1 . 5 . A compressor system comprising: a compressor; and a motor for the compressor, wherein the motor is the rotating electrical machine according to claim 2 . 6 . A pump system comprising: a pump; and a motor for the pump, wherein the motor is the rotating electrical machine according to claim 2 .
Assignees
Inventors
Classifications
- H02K9/18Primary
wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing · CPC title
Cooling the drive system · CPC title
with fans or impellers driven by the machine shaft · CPC title
Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title
the pump being electrically driven · CPC title
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Frequently asked questions
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- What does patent US2019109514A1 cover?
- A rotating electrical machine includes a rotating electrical machine body including a stator, a rotor, a fan configured to circulate a coolant for cooling the stator and the rotor, and a casing containing the stator, the rotor and the fan; and a cooler connected to the rotating electrical machine body. The coolant flows from the machine body into the cooler. The cooler cools the coolant. The co…
- Who is the assignee on this patent?
- Hitachi Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02K9/18. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Apr 11 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).