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Home Metal Working High-speed-motor-with-two-phase-cooling-system

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 High speed motor with two-phase cooling system

Details
Inventors: Boldlehner, Hans-Georg;
Assignee: Elin Motoren GmbH (Vienna, AT)
Primary Examiner: LaBalle; Clayton
Assistant Examiner: Tamai; Karl Imayoshi
Attorney, Agent or Firm: Greenblum & Bernstein P.L.C.

The aim of the invention is to design a rotary electric machine, in particular a high-speed motor, whose cooling system ensures that the heat generated is eliminated without a non-uniform heat distribution building up in the motor. The motor has cooling ducts (5) in the stator (2), between the bundle of laminations (3) and the housing (4). Located on the housing (4) are connections (6) for the supply of the coolant and connections (7) for the discharge of the coolant. A two-phase mixture is used as the coolant for the housing. If the bundle of laminations (3) gives out heat uniformly in all directions, evaporation will take place continuously round the whole of the casing. The motor also has as second coolant circuit. Gaseous coolant is fed in through another set of connections (8) to cool the rotor. This gaseous coolant passes through ducts (9) in the bundle of laminations (3) and into the air gap (10) between the rotor (1) and the bundle of laminations (3). The motor is designed for use at a rating of about 230 kW in high-speed compressors turning at 18,000 rpm. It is designed to use the same coolant as the compressor, in particular a freon.

DETAILED DESCRIPTION The object of the invention is to produce an electrically rotating machine, in particular a high-speed motor, whose cooling assures the conveyance of dissipated heat.
Accordingly, the present invention may be directed to a high-speed motor having a housing and a bundle of laminations.
The high-speed motor may also include a housing coolant including a two-phase mixture; a rotor coolant including a gaseous coolant; a rotor coolant inlet coupled to the housing; and a radial cooling conduit in the bundle of laminations conducting the rotor coolant from the rotor coolant inlet to a space between the rotor and the bundle of laminations.
In accordance with another feature of the present invention, the high-speed motor may further include at least one housing coolant outlet coupled to the housing and at least one rotor coolant outlet coupled to the housing.
The housing may include a longitudinal axis and each of the housing coolant outlets and the rotor coolant outlets may be arranged in a line parallel to the longitudinal axis.
In accordance with a further feature of the present invention, the line may be located along an uppermost point of the housing.
In accordance with still another feature of the present invention, a housing coolant inlet may be located at a position approximately 120.
degree.
from the line and the rotor coolant inlet may be located at a position approximately 90.
degree.
from the line.
In accordance with yet another feature of the present invention, the housing coolant inlet and the rotor coolant inlet may be circumferentially spaced around a perimeter of the housing.
In accordance with still another feature of the present invention, the two-phase mixture may include a liquid-gas state of aggregation.
Further, the housing coolant and the rotor coolant may include freon.
In accordance with a further feature of the present invention, the bundle of laminations may evaporate the housing coolant to provide continuous cooling around the inside of the housing


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