Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-07-08
1988-05-17
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 54, 310 59, 310 60A, 310217, 310254, H02K 908
Patent
active
047453141
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a liquid-cooled AC motor having a laminated stator core provided with cooling liquid circulating passages for directly cooling the stator by circulating a cooling liquid through the cooling liquid circulating passages and, more particularly, to improvements in the leakproof construction of the cooling liquid circulating passages.
2. Background Art
Air-cooled AC motors (for example, U.S. Pat. No. 4,534,686), in which cooling air passages are formed in the laminated core for directly cooling the stator as a construction for cooling the stator by removing the heat of iron loss and copper loss from the laminated core, have been widely used. An AC motor of a cooling system, in which cooling water is introduced from the outside into cooling liquid circulating passages formed in the laminated core to cool the laminated core, and then the cooling liquid holding the heat of the laminated core is discharged outside the cooling liquid circulating passages and recovered to improve cooling efficiency by cooling the laminated core with a liquid having a large heat capacity, has been proposed.
The cooling construction of this liquid-cooled motor has cooling liquid passages of a leakproof construction formed by welding a laminated core at a plurality of positions on the circumference thereof under compression by an external pressure. Further, a resin is impregnated in the laminated core. However, the leakproof construction of the cooling liquid passages needs further improvement to maintain the leakproof performance over an extended period of time corresponding to the nominal life of the liquid-cooled motor.
DISCLOSURE OF THE INVENTION
Accordingly, it is an object of the present invention to improve the leakproof performance of the cooling liquid passages of the leakproof construction of such a liquid-cooled motor through resin impregnation by uniformly compressing the laminated core over the entire area from the outer circumference to the inner circumference thereof.
In view of the foregoing object of the invention, the present invention provides a liquid-cooled motor comprising a laminated stator core provided with cooling liquid passages, in which end plates are applied to the opposite axial end surface of the laminated core, and the laminated core is compressed through the end plates by fastening the end plates with bolts inserted through the end plates and the cooling liquid passages of the laminated core. Thus, the present invention is intended to enhance the leakproof performance of the cooling liquid passages by uniformly compressing the laminated core over the entire area from the outer circumference to the inner circumference thereof to a higher degree and impregnating the highly compressed laminated core with a resin.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary sectional view of a liquid-cooled motor, in an embodiment, according to the present invention, showing the essential construction of the liquid-cooled motor relating to liquid-cooling function; and
FIG. 2 is a side elevation of the liquid-cooled motor of FIG. 1, as viewed from one end thereof.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring first to FIG. 2, a liquid-cooled motor embodying the present invention comprises a rotor 12 rotatably supported by a rotor shaft 10 in the central portion thereof, and a stator 14 surrounding the rotor 12 with a gap G therebetween. The stator 14 has a core 16 formed by laminating thin plates along the direction of the center axis of the rotor shaft 10. As is generally known, stator coils, not shown, are fitted in slots 18 formed in the laminated core 16. End plates are applied to the axially opposite end faces of the laminated core 16, respectively. (In FIG. 2, only one end plate 20 among the two end plates is seen. The other end plate 22 is provided on the other side.) Weld zones 24 extend from the end plate 20 to the other end plate 22 to unite the end plates 20 and 22 and the laminated core 16. The weld zone 24 are formed at
REFERENCES:
patent: 1631737 (1927-06-01), Knight
patent: 2390130 (1945-12-01), Sigmund
patent: 2493414 (1950-01-01), Morrison
patent: 2697179 (1954-12-01), Wendel
patent: 3693035 (1972-09-01), Ostwald
patent: 4319150 (1982-03-01), Roddy
patent: 4534686 (1985-08-01), Nakamura
Materials of Engineering; C. K. Keyser; Prentice Hall, Inc.; Englewood Cliffs, N.J.; Sep. 1956; p. 426.
Fanuc Ltd.
Skudy R.
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