IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0586394
(1984-03-05)
|
우선권정보 |
CH-198301304 (1983-03-10) |
발명자
/ 주소 |
- Prenner, Herbert
- Schroder, Paul
|
출원인 / 주소 |
- BBC Brown, Boveri & Company Limited
|
대리인 / 주소 |
Oblon, Fisher, Spivak, McClelland & Maier
|
인용정보 |
피인용 횟수 :
28 인용 특허 :
2 |
초록
▼
A gas-cooled a.c. machine having a rotor and a stator, each in the form of sheet metal packs, and a winding head, wherein in order to obtain optimum cooling of the rotor sheet metal pack, the stator sheet metal pack and the winding head, the machine is constructed of a stator central part and two st
A gas-cooled a.c. machine having a rotor and a stator, each in the form of sheet metal packs, and a winding head, wherein in order to obtain optimum cooling of the rotor sheet metal pack, the stator sheet metal pack and the winding head, the machine is constructed of a stator central part and two stator end parts and ducts are provided in the casing corners for the removal of the cooling gas. The ducts are bounded only by the walls of the casing and the back of the stator sheet metal pack, are separated by the stator sheet metal pack, and extend over the total length thereof. Cooling gas conveyed by fans is first conveyed into the inner winding head chamber or the rotor inlet flow chamber and there divided into two cooling circuits connected in parallel. In a first cooling circuit, the cooling gas is led through the rotor sheet metal pack and through the stator sheet metal pack, and in the second cooling circuit through the winding head. The stator end parts are each formed as cooling gas inlet and outlet casings and are provided with separating walls for separating the two cooling circuits. The separating walls have by-pass openings whose respective effective cross-sectional areas can be varied by displaceable cover plates.
대표청구항
▼
1. A gas cooled alternating current machines having a motor mounted on a shaft and surrounded by a stator, said rotor and said stator each having opposed ends, said stator having a stator central part including a laminated sheet metal pack and two stator end parts, a fan attached to said shaft at ea
1. A gas cooled alternating current machines having a motor mounted on a shaft and surrounded by a stator, said rotor and said stator each having opposed ends, said stator having a stator central part including a laminated sheet metal pack and two stator end parts, a fan attached to said shaft at each rotor end and a shell mounted in association with the fan for conveying a cooling medium towards said stator and said rotor, the stator sheet metal pack being clamped between two end plates and subdivided by radially extending cooling ducts into individual partial packs, the stator sheet metal pack being surrounded by a casing having walls defining plural corners, comprising: plural upper and lower ducts for the removal of the cooling gas formed in respective of the casing corners, said ducts bounded only by the walls of the casing and surfaces of the sheet metal pack separated by the sheet metal pack and extending over the total length of the sheet metal pack; the stator end parts formed both as cooling gas inlet and cooling gas outlet casings, said stator end parts having a height corresponding approximately to that of the stator central part and widths protruding on both sides relative to the stator central part, each inlet and outlet casing including a separating wall which in conjunction with said shell substantially subdivides the respective inlet and outlet casing into four chambers, including a cooling gas induction chamber, a winding head chamber and a pair of cooling gas outlet flow chambers which are located symmetrically about a vertical plane; each cooling gas outlet flow chamber having at least one outlet flow opening and each being connected to a respective lower duct and a respective upper duct of the stator central part via openings in the end plates of the stator central part; said separating walls in each stator end part between the winding head chamber and the cooling gas outlet flow chambers being located in pairs symmetrically about the vertical plane and separating the winding head chamber and the cooling gas outlet flow chambers from one another; and said separating walls having by-pass openings through which cooling gas is led in a first cooling branch through the rotor and stator and in a second cooling branch in parallel to the first cooling branch through the stator winding head; said separating walls in the stator end parts extending in an axial direction from the end plates to the shell allocated to the fans; said separating walls defining a cross-section which at most coincides approximately with the external contour of the stator metal sheet and at least lies outside a hypothetical cylinder obtained by a circle inscribed on the sheet metal pack external contour; and said separating walls contacting a respective internal side of the lower and upper casing wall of the stator end parts and including by-pass openings approximately evenly distributed over the periphery thereof. 2. An alternating current machine according to claim 1, comprising: the external contour of the sheet metal pack having a circular shape or the shape of an approximately axisymmetric n-sided polygon with n greater than 6; said stator means metal pack having side surfaces running parallel to the casing walls in contact with their associated casing walls and radially supported thereby; and said walls of the casing protruding beyond said side surfaces of the stator sheet metal pack being solidly connected to one another to form said ducts for the removal of the cooling gas, which ducts extend over the complete length of the sheet metal pack. 3. An alternating current machine according to claim 1, wherein said separating walls comprise means for varying the effective cross-sectional areas of said by-pass openings. 4. An alternating current machine according to claim 3, comprising: said separating walls in the stator end parts each having a vertical central part and angled lower and upper parts which extend axially from the end plates as far as said shells; said separating walls being congruent with the external contour of the six side edges of the axisymmetric octagon of the sheet metal pack; and said separating walls having said by-pass openings located respectively in the center of the central part and the angled lower and upper parts thereof. 5. An alternating current machine according to claim 3, wherein said varying means comprises: cover plates displaceably located over the by-pass openings. 6. An alternating current machine according to claim 4, comprising: said by-pass openings in the cooling gas outlet flow chamber defining respective free cross-sectional areas (S 3, S 4, S 5 ) and said end plate openings defining respective cross-sectional areas (S 1, S 2 ), wherein the sum (S 3 +S 4 +S 5 ) of the free cross-sectional areas (S 3, S 4, S 5 ) of the by-pass openings in the cooling gas outlet flow chamber defining a first ratio relative to the sum (S 1 +S 2 ) of the cross-sectional areas (S 1, S 2 ) of the end plate openings, said first ratio being in the range from 0.15 to 0.3. 7. An alternating current machine according to claim 6, comprising: the cooling gas outlet flow chamber having a central part defining a cross-sectional area (S 6 ) given by the distance of a vertical central part of the separating walls from the casing wall of the stator end parts and the axial length of the separating walls, expressed as a second ratio to the sum of the cross-sectional area (S 1 ) of the lower end plate penetration and the free cross-sectional area (S 3 ) of the by-pass opening located in a lower angled part of the separating walls and half the free cross-sectional area (S 4 ) of the by-pass opening located in the central part of the separating walls, wherein said second ratio is greater than 1.
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