Motor-driven centrifugal air compressor with axial airflow
First Claim
1. A motor-driven compressor-electronic power package assembly, comprisingan electric motor and a rotating shaft driven thereby,a compressor wheel driven by said rotating shaft,a central motor housing having an outside wall, and carrying a bearing system for the motor-driven rotating shaft,an external housing having an inside wall and an outside wall, the external housing comprising a first portion cooperating with the compressor wheel to generate a flow of compressed air, and a second portion carrying the central motor housing and forming, with its inside wall, an air ducting system with a plurality of straightening and cooling fins,an electronic power package for the electric motor carried by said second external housing portion, andsaid compressor wheel and second external housing portion providing a generally axial flow of compressed air through the air ducting system before exiting said motor-driven compressor through a compressed air outlet and drawing heat from the electric motor and the electronic power package.
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0 Petitions
Accused Products
Abstract
A motor-driven compressor-electronic motor power package assembly places temperature-sensitive components of the electric motor or the electronic power package for the electric motor, or both, in heat transfer relationship with the flow of compressed air from the compressor.
161 Citations
32 Claims
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1. A motor-driven compressor-electronic power package assembly, comprising
an electric motor and a rotating shaft driven thereby, a compressor wheel driven by said rotating shaft, a central motor housing having an outside wall, and carrying a bearing system for the motor-driven rotating shaft, an external housing having an inside wall and an outside wall, the external housing comprising a first portion cooperating with the compressor wheel to generate a flow of compressed air, and a second portion carrying the central motor housing and forming, with its inside wall, an air ducting system with a plurality of straightening and cooling fins, an electronic power package for the electric motor carried by said second external housing portion, and said compressor wheel and second external housing portion providing a generally axial flow of compressed air through the air ducting system before exiting said motor-driven compressor through a compressed air outlet and drawing heat from the electric motor and the electronic power package.
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12. A self-cooling, axial flow, permanent magnet motor-driven compressor-electronic package assembly, comprising
a permanent magnet motor comprising a motor enclosure including a cylindrical housing and end closures, stator windings carried by the cylindrical housing, a pair of bearings carried by the end enclosures, and a permanent magnet rotor and motor shaft rotatably carried by the pair of bearings, said motor shaft having a portion extending outwardly through one of said end closures; -
a centrifugal compressor wheel carried by said motor shaft portion, said compressor wheel having a plurality of air compressing vanes, said air compressing vanes having central air intake portions and peripheral compressed air output portions; an external housing having a first portion forming an axial air inlet to the central air intake portions of the compressor wheel vanes, a second portion forming, with said one of the motor end closures, an outwardly extending annular compressed air passageway leading from the peripheral portions of the compressor wheel vanes, a third portion forming, with said one of the motor enclosures, an inwardly extending annular compressed air passageway leading from the outwardly extending compressed air passageway, and a fourth portion forming, with the cylindrical housing an axially extending annular compressed air passageway around the cylindrical motor housing and leading to an axially directed compressed air outlet, each of said inwardly extending annular compressed air passageway and said axially extending annular compressed air passageway including a plurality of vanes in their compressed air passageways; and an electronic package for application of polyphase alternating current to the stator windings, said electronic package being carried by said third and fourth portions of said external housing for transfer of heat from the electronic package to the compressed air flowing through external housing. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An assembly including an electronic polyphase motor power package and a motor-driven air compressor formed about a central axis, comprising
a compressor housing; -
an electric motor comprising stator windings, a rotor and a rotatable shaft driven by said stator windings, said electric motor being carried within the compressor housing by a motor support carrying the stator windings and rotatably carrying said rotatable shaft on the central axis of the compressor; a centrifugal compressor wheel carried by said rotating shaft of the motor on the central axis of the compressor; said compressor housing having a first portion forming, with said compressor wheel, a compressed air passageway said air compressor providing an output of compressed air at its periphery, and a second portion forming a compressed air passageway from the periphery of the compressor wheel, said second portion of the compressor housing carrying said polyphase electronic motor power package and directing a flow of compressed air into a heat transfer relationship with said polyphase electronic motor power package and said motor support. - View Dependent Claims (19, 20, 21, 22)
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23. An electric motor power package and motor-driver compressor assembly, comprising
an external housing; -
an electric motor comprising stator windings, a rotor and rotatable shaft driven by said stator windings, said electric motor being carried within said external housing in a motor support carrying the stator windings and rotatably carrying said rotatable shaft, compressor wheel carried by said rotatable shaft within said external housing and cooperating therewith to provide a flow of compressed air from its periphery, said external housing carrying said electronic motor power package downstream of said compressor wheel and forming a compressed air passageway in heat transfer relationship with said electronic motor power package and said electric motor, and further forming, with an enclosure for said electronics power package, a further compressed air passageway over said electronic motor power package.
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24. A motor-driven two-compressor assembly, comprising a high-speed, permanent magnet electric motor comprising stator windings, and a permanent magnet rotor and a rotating shaft carried by a pair of shaft bearings and driven by said stator windings about an axis of rotation, said rotatable shaft including shaft extensions extending outwardly from both of the shaft bearings;
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a central motor housing enclosing the electric motor and carrying said stator windings between said pair of shaft bearings for the motor-driven rotating shaft; first and second centrifugal compressor wheels attached to said shaft extensions, each compressor wheel comprising a wall extending outwardly from a shaft-engaging hub carrying a plurality of compressor vanes; an external housing with three portions, the first and third portions of said external housing each forming a compressor casing, each compressor casing enclosing and cooperating with one of the compressor wheels and forming a central air inlet and a compressed air outlet;
the second portion of said external housing carrying the central motor housing and forming an air ducting system around the central motor housing;said compressor wheels and said second portion of the external housing providing a generally axial flow of compressed air through the air ducting system before entering the third external housing portion, thereby drawing heat from the central motor housing. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification