Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-12-20
1999-09-14
LaBalle, Clayton
Electrical generator or motor structure
Dynamoelectric
Rotary
310 52, 310 58, 310 59, 310 89, H02K 920
Patent
active
059527480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a cooling system for an electrically rotating machine, in particular for a gearless three-phase asychronous high-speed motor, which has cooling conduits between the bundle of laminations and the housing as well as connections in the housing that are for the supply and discharge of the coolant.
2. Discussion of Background Information
High-speed motors with speeds greater than 10,000 rpm are a special subject in the motor field. The technical problems are enormous at such high speeds and increase exponentially with increasing speed and/or power.
The state of the art for this kind of high-speed machines, with speeds of up to 18,000 rpm and powers below 100 kW is the direct current technology. However, due to the enormous wear and tear on the brushes in long term operation, this technology is connected with high costs.
The control of critical whirling speed is one of the key aims in the development of high-speed motors. The smaller the bearing spacing is on the motor shaft, the easier it is to control the critical whirling speed. All other structural requirements must be subordinated to the demand for a motor shaft that is as short as possible. With the shortening of the bearing spacing, though, the motor becomes more compact and as a result, the cooling problems become disproportionately greater.
In actual practice, the structural length is normally determined based on the calculation of the critical whirling speed and the attempt is made to carry away the dissipated heat by means of particular steps. As a result, it is inevitable that the component temperature rises and one approaches the use limit of the materials employed.
SUMMARY OF THE INVENTION
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.
In accordance with a still further feature of the present invention, a housing coolant inlet may be coupled to a bottom portion of the housing. Further, a housing coolant outlet may be coupled to the housing at a position circumferentially spaced from the housing coolant inlet. Still further, a rotor coolant outlet may
REFERENCES:
patent: 2604500 (1952-07-01), Koning
patent: 3388559 (1968-06-01), Johnson
patent: 3407623 (1968-10-01), Richardson et al.
patent: 3727085 (1973-04-01), Goetz et al.
patent: 3805101 (1974-04-01), Purman
patent: 4959570 (1990-09-01), Nakamura et al.
patent: 5317224 (1994-05-01), Ragaly
patent: 5509463 (1996-04-01), Callaway, Sr. et al.
Translation of Japanese Patent Application 01-259,740, Oct. 17, 1989.
Elin Motoren GmbH
LaBalle Clayton
Tamai Karl Imayoshi
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