Patent
High capacity chiller compressor
Mark C Doty,Earl A. Campaigne,Thomas A. Watson,Paul K Butler,Quentin E Cline,S Samuel J Showalter +5 more
TLDR
In this paper, a variable frequency drive (VFD) was used to drive a permanent magnet motor and match compressor speed with compressor load, a direct drive impeller that eliminated gearing losses, and magnetic bearings that reduce frictional losses.Abstract:
A high efficiency, low maintenance single stage or multi-stage centrifugal compressor assembly for large cooling installations. The assembly is highly efficient by virtue of a variable frequency drive (VFD) that drives a permanent magnet motor and matches compressor speed with compressor load, a direct drive impeller that eliminates gearing losses, and magnetic bearings that reduce frictional losses. The back-emf produced by the motor provides an intermediate power source for the magnetic bearings in the event of a loss of electrical power. A cooling system provides direct cooling of the rotor with gas refrigerant, and cooling of the stator with liquid refrigerant. Modular construction allows the compressor to be retrofit with upgrades. An inlet guide vane system operates without need for oil lubrication. The use of light metal castings and elimination of gearing reduces the weight to one-third or less of comparably powered conventional units.read more
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Patent
Centrifugal compressor assembly and method
Paul F. Haley,Rick T. James +1 more
TL;DR: In this paper, an integrated inlet flow conditioning assembly comprising a flow conditioning nose, a plurality of inlet guide vanes and flow conditioning body was used to condition flow of refrigerant into an impeller to achieve a target approximately constant angle swirl distribution with minimal guide vane turning.
Patent
Rankine cycle heat recovery methods and devices
TL;DR: An integrated expansion turbine/electrical generator assembly (collectively referred to as a "turbo-generator") is used in waste heat recovery and similar applications as mentioned in this paper, which uses a common shaft mounting a one or more stage expansion turbine and a homopolar electrical generator.
Patent
Turbo compressor and turbo refrigerator
TL;DR: In this paper, a turbo compressor with an impeller that rotates and a gear unit accommodation space that accommodates lubricating oil and a large diameter gear that transmits rotating force to the impeller is described.
Patent
Motor cooling applications
Ivan Jadric,Steven J. Estes,John C. Hansen,Koman B. Nambiar,Andrew M. Welch,Steven T. Sommer,Gregory K. Beaverson +6 more
TL;DR: In this article, a cooling system is provided for a motor powering a compressor in a vapor compression system, including a housing (114) and a cavity (126) within the housing, and a first fluid circuit (140) has a first connection to receive a refrigerant into the cavity and a second connection to deliver refrigerant from the cavity to a heat exchanger for a heat transfer relationship with a heat generating component.
Patent
Embedded permanent magnet rotary electric machine
TL;DR: In this article, permanent magnet segments are configured such that shapes and directions of orientation thereof have mirror symmetry relative to a plane that passes through a magnetic pole center and that includes a central axis of the rotor core, and that a permanent magnet segment that is further away from the magnetic pole centre in a circumferential direction has a smaller angle of orientation.
References
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Patent
Rotary electrical machines
TL;DR: In this paper, the stator-rotor spaces are held under a vacuum and a coiled pipe is disposed in or formed integrally with each of the passages, such that the outlet of one pipe (100) is coupled with the inlet of the pipe (102) disposed in the adjacent passage.
Patent
Apparatus for cooling the power electronis of a refrigeration compressor drive
TL;DR: In this article, the power electronics components of a variable frequency drive for the motor of a refrigerant system compressor are mounted upon a heat sink and refrigerant from the system condenser is passed through the heat sink by means of a flow line.
Patent
Compressor unit comprising a centrifugal compressor and an electric motor
TL;DR: In this article, the rotor of the electric motor and the rotor shaft of the compressor are arranged on a common rotor shaft, which is mounted in two radial magnetic bearings and one axial magnetic bearing.
Patent
Oil-free liquid chiller
TL;DR: In this article, a variable speed-driven motor is used to drive the compressor of a chiller, which does not require or employ an oil-based lubrication system, and achieves an optimized part load chiller performance.
Patent
Thermal isolation system for turbochargers and like machines
Jerry Glaser,Frank A. Bescoby +1 more
TL;DR: In this paper, an approach for cooling and thermally isolating turbocompressor bearing foil bearings is presented, which includes arrangements for protecting the bearing against combustion products which may leak past turbine wheel seals by removing such combustion products before they reach the bearing.