CN110429747B - Method for reducing circumferential temperature difference between motor coil and iron core - Google Patents
Method for reducing circumferential temperature difference between motor coil and iron core Download PDFInfo
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- CN110429747B CN110429747B CN201910813713.2A CN201910813713A CN110429747B CN 110429747 B CN110429747 B CN 110429747B CN 201910813713 A CN201910813713 A CN 201910813713A CN 110429747 B CN110429747 B CN 110429747B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
Abstract
The invention discloses a method for reducing circumferential temperature difference between a motor coil and an iron core, which belongs to the technical field of wind driven generators and is characterized by comprising the following steps: a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator; b. an inclined wind shield is arranged at the outlet of the air inlet pipe, an air quantity adjusting plate is arranged on the air inlet hole, and the circumferential resistance of air is adjusted through the air quantity adjusting plate; c. in a circumferential symmetrical unit, the air passing area of the end close to the fan axis is the smallest, and the air passing area of the end far away from the fan axis is the largest. The method is simple and flexible to operate and convenient to implement, and not only can the circumferential uniformity of the airflow be improved; and the area of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed, and the circumferential temperature difference of the motor can be reduced to 10-20K.
Description
Technical Field
The invention relates to the technical field of wind driven generators, in particular to a method for reducing circumferential temperature difference between a motor coil and an iron core.
Background
For a low-speed large-scale rotating motor, particularly a direct-drive wind driven generator, the rotating speed is only about 10r/min, the pressure generated by a rotating component is only a few pascals, and the pressure cannot drive enough air to flow in the motor to take away the loss generated in the running process of the motor, the common solution for the motor is that a special fan is arranged on a motor base to be used as a main pressure source for air flow, but the fan cannot be uniformly arranged in the circumferential direction of the base due to the arrangement requirements of braking, locking, outlet boxes, inlet and outlet holes and the like, usually, the inlet and outlet holes of the motor fan can only be arranged at the upper position of the base, and calculation and test show that: the arrangement can cause uneven circumferential temperature distribution of the stator coil and the iron core, and when the motor adopts high-heat-load design, the circumferential temperature difference can reach 30K-40K.
In recent years, fans are uniformly arranged in the circumferential direction, but because the motor is large in diameter and circumferential space and the fan air supply speed is high, the temperature difference between a stator coil and an iron core in a region between a fan air inlet corresponding region and the fan is large, and circumferential temperature distribution is uneven.
At present, the limit value of the temperature of the motor mainly aims at the temperature of the hottest point, so that the maximum output of the motor can be seriously influenced due to the phenomenon of uneven circumferential temperature on the one hand, and on the other hand, the actual maximum temperature of a stator coil and an iron core of the motor can not be truly reflected by the measured temperature, so that potential hidden danger is brought to the safe operation of the motor.
Chinese patent publication No. CN 109787381a, published as 2019, 05 and 21, discloses a motor cooling device, which is characterized by comprising:
a plurality of stator vent holes formed in a stator core in an axial direction of the stator core;
first and second mounting pieces each having a shape corresponding to the stator core, coupled to both sides of the stator core in an axial direction, respectively, and formed with a plurality of first and second ventilation holes in the axial direction, respectively;
a bracket including a main body and first and second support portions protruding radially outward from both sides of the main body, the main body being formed with a plurality of bracket ventilation holes, and first and second installation parts being supported on the first and second support portions, respectively, wherein the first and second ventilation holes form first and second ventilation ducts independent of each other with corresponding stator ventilation holes among the plurality of stator ventilation holes, flow directions of airflows entering and flowing through the first and second ventilation ducts from both sides in an axial direction of the stator core are reversed to each other, and flow out to the outside through the plurality of bracket ventilation holes.
Chinese patent publication No. CN 202856493U, published as 2013, 04 and 03, discloses an interpolar air deflector for a rotor of a hydro-generator, which comprises an air deflector, a screw, a fastening member, a pressing plate, a backing plate and a fixing block, and is characterized in that: assembling a fixed block in a magnet yoke in advance, screwing a screw into the fixed block, and locking by using a backing plate and a fastener; and finally, sleeving the base plate, the air deflector and the pressing plate on the upper end of the screw rod, and clamping by using a fastening piece.
In the prior art represented by the above patent documents, due to poor structural design, the circumferential uniformity of the air flow cannot be effectively improved, the circumferential uniform distribution of the air speed cannot be realized, the circumferential temperature difference of the motor cannot be effectively reduced, and the operation is complex and inconvenient to implement.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for reducing the circumferential temperature difference between a motor coil and an iron core, which is simple and flexible to operate and convenient to implement, and can improve the circumferential uniformity of air flow; and the area of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed, and the circumferential temperature difference of the motor can be reduced to 10-20K.
The invention is realized by the following technical scheme:
a method for reducing circumferential temperature difference between a motor coil and an iron core is characterized by comprising the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield is arranged at an outlet of the air inlet pipe, an included angle between the inclined wind shield and the first vertical plate is 30-60 degrees, an air volume adjusting plate is arranged on the air inlet hole, the air volume adjusting plate is hinged with the first circumferential ring plate, and circumferential resistance of air is adjusted through the air volume adjusting plate;
c. in a circumferential symmetrical unit, the air passing area of the end close to the fan axis is the smallest, and the air passing area of the end far away from the fan axis is the largest.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core comprises a rotor base, a rotor iron core arranged on the rotor base, a plurality of rotor magnetic steels arranged along the axial direction of the rotor iron core, a plurality of sections of stator iron core sections, a first iron core pressing plate, a second iron core pressing plate and a tensioning screw rod, wherein the stator iron core sections are formed by laminating silicon steel sheets, a groove body for placing a stator coil is formed in each silicon steel sheet, a stator channel steel is connected between any two adjacent sections of stator iron core sections, the two sections of stator iron core sections and the stator channel steel form a stator ventilation channel for circulation of a cooling medium, the tensioning screw rod penetrates through the plurality of sections of stator iron core sections, one end of the tensioning screw rod is fixedly connected with the first iron core pressing plate, the other end of the tensioning screw rod is fixedly connected with the second iron core pressing plate, an air gap is arranged between the rotor magnetic steel and the, one end of the first circumferential ring plate is fixedly connected with the first iron core pressing plate, the other end of the first circumferential ring plate is fixedly connected with the second iron core pressing plate, at least three axial vertical plates are fixedly connected to the inner wall of the first circumferential ring plate, an air inlet cavity and an air outlet cavity are formed between the first circumferential ring plate, the stator iron core section and two adjacent axial vertical plates, the air inlet cavity and the air outlet cavity are arranged at intervals, a plurality of air inlet holes and a plurality of air outlet holes are formed in the first circumferential ring plate, the air inlet holes are communicated with the corresponding air inlet cavities, the air outlet holes are communicated with the corresponding air outlet cavities, a first vertical plate and a second vertical plate are fixedly connected to the outer wall of the first circumferential ring plate, a second circumferential ring plate is fixedly connected between the first vertical plate and the second vertical plate, the first vertical plate is connected with an inclined wind shield through a plurality of connecting plates, and an air outlet pipe communicated with the air outlet cavity is connected to the second circumferential ring plate, and the first vertical plate is connected with an air inlet pipe communicated with the air inlet cavity.
The thickness of the silicon steel sheet is 0.5mm or 0.35 mm.
A plurality of fresh air inlets and a plurality of exhaust vent that set up on the first circumferential ring board are at the axial of first circumferential ring board dislocation arrangement and the interval arrangement in the circumference of first circumferential ring board.
The rotor base, the first circumferential annular plate and the first vertical plate enclose a large cavity, the air inlet pipe is communicated with the large cavity, and the large cavity is communicated with the air inlet cavity.
The ratio of the maximum overfire area of the far fan end far away from the fan axis to the minimum overfire area of the near fan end close to the fan axis is 2:1-10: 1.
The beneficial effects of the invention are mainly shown in the following aspects:
the invention comprises the steps that firstly, a device for reducing the circumferential temperature difference between a large-diameter motor coil and an iron core is arranged on a wind driven generator; b. an inclined wind shield is arranged at an outlet of the air inlet pipe, an included angle between the inclined wind shield and the first vertical plate is 30-60 degrees, an air volume adjusting plate is arranged on the air inlet hole, the air volume adjusting plate is hinged with the first circumferential ring plate, and circumferential resistance of air is adjusted through the air volume adjusting plate; c. the cross air area of the end close to the fan axis is the smallest and the cross air area of the end far away from the fan axis is the largest in a circumferential symmetrical unit, compared with the prior art, the operation is simple and flexible, the implementation is convenient, and the circumferential uniformity of the air flow can be improved; and the area of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed, and the circumferential temperature difference of the motor can be reduced to 10-20K.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core comprises a rotor base, a rotor iron core arranged on the rotor base, a plurality of rotor magnetic steels arranged along the axial direction of the rotor iron core, a plurality of sections of stator iron core sections, a first iron core pressing plate, a second iron core pressing plate and a tensioning screw rod, wherein the stator iron core sections are formed by laminating silicon steel sheets, a groove body for placing the stator coil is formed in each silicon steel sheet, a stator channel steel is connected between any two adjacent sections of stator iron core sections, the two sections of stator iron core sections and the stator channel steel form a stator ventilation groove for circulating a cooling medium, the tensioning screw rod penetrates through the plurality of sections of stator iron core sections, one end of the tensioning screw rod is fixedly connected with the first iron core pressing plate, the other end of the tensioning screw rod is fixedly connected with the second iron core pressing plate, air gaps are formed between the rotor magnetic steels and the stator, one end of a first circumferential ring plate is fixedly connected with a first iron core pressing plate, the other end of the first circumferential ring plate is fixedly connected with a second iron core pressing plate, at least three axial vertical plates are fixedly connected to the inner wall of the first circumferential ring plate, an air inlet cavity and an air outlet cavity are formed between the first circumferential ring plate, the stator iron core section and two adjacent axial vertical plates, the air inlet cavity and the air outlet cavity are arranged at intervals, a plurality of air inlet holes and a plurality of air outlet holes are formed in the first circumferential ring plate, the air inlet holes are communicated with the corresponding air inlet cavities, the air outlet holes are communicated with the corresponding air outlet cavities, a first vertical plate and a second vertical plate are fixedly connected to the outer wall of the first circumferential ring plate, a second circumferential ring plate is fixedly connected between the first vertical plate and the second vertical plate, the first vertical plate is connected with an oblique air baffle through a plurality of connecting plates, an air outlet pipe communicated with the air outlet cavities is connected to the second circumferential ring plate, an air inlet pipe communicated with the air inlet, when the motor operates, on one hand, high-speed airflow at the outlet of the fan impacts the inclined wind shield to cause circumferential diffusion and axial steering of the airflow, so that circumferential uniformity of the airflow can be improved; on the other hand, the areas of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed; the whole device has the advantages of simple structure, easy implementation, convenient adjustment and obvious effect, and can reduce the circumferential temperature difference of the motor by 10-20K.
And thirdly, the thickness of the silicon steel sheet is 0.5mm or 0.35mm, the selection flexibility is strong, and the processing and the manufacturing are easy.
Fourthly, the plurality of air inlet holes and the plurality of air outlet holes arranged on the first circumferential ring plate are arranged in a staggered mode in the axial direction of the first circumferential ring plate and are arranged at intervals in the circumferential direction of the first circumferential ring plate, so that the circumferential uniformity of air flow can be further improved, and a good uniform heat dissipation effect is guaranteed.
According to the invention, the rotor base, the first circumferential annular plate and the first vertical plate form a large cavity in a surrounding mode, the air inlet pipe is communicated with the large cavity, and the large cavity is communicated with the air inlet cavity, so that ventilation can be smooth, and the heat dissipation effect can be improved.
According to the invention, the ratio of the maximum overfire area of the far fan end far away from the axis of the fan to the minimum overfire area of the near fan end close to the axis of the fan is 2:1-10:1, and by adopting the specific area ratio, the requirements of the total air quantity and the air quantity uniformity of the motor are considered, and the circumferential temperature difference of the motor can be effectively reduced.
Drawings
The invention will be further described in detail with reference to the drawings and the detailed description, in which:
FIG. 1 is a schematic structural diagram of a device for reducing circumferential temperature difference between a large-diameter motor coil and an iron core according to the present invention;
FIG. 2 is a schematic view of a stator core segment according to the present invention;
FIG. 3 is a schematic view of the flow structure of the circumferential wind zone airflow of the present invention;
FIG. 4 is a schematic view of the arrangement of the circumferential air inlet and outlet openings of the present invention;
FIG. 5 is a schematic structural diagram of a device for reducing the circumferential temperature difference between a large-diameter motor coil and an iron core, which is used for a fan, according to the present invention;
the labels in the figure are: 1. the rotor frame, 2, rotor core, 3, rotor magnet steel, 4, stator core section, 5, first iron core clamp plate, 6, second iron core clamp plate, 7, tension screw, 8, silicon steel sheet, 9, stator coil, 10, cell body, 11, stator channel-section steel, 12, stator ventilation groove, 13, air gap, 14, first circumferential ring plate, 15, axial riser, 16, air inlet chamber, 17, air outlet chamber, 18, air inlet hole, 19, air outlet hole, 20, first riser, 21, second riser, 22, second circumferential ring plate, 23, connecting plate, 24, slant deep bead, 25, air outlet pipe, 26, air inlet pipe, 27, air volume regulating plate, 28, big cavity, 29, cross the wind area.
Detailed Description
Example 1
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is arranged at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 30 degrees, an air quantity adjusting plate 27 is arranged on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
A, mounting a device for reducing the circumferential temperature difference between a large-diameter motor coil and an iron core on a wind driven generator; b. an inclined wind shield is installed at an outlet of the air inlet pipe, an included angle between the inclined wind shield and the first vertical plate is 30 degrees, an air quantity adjusting plate is installed on the air inlet hole, the air quantity adjusting plate is hinged with the first circumferential ring plate, and circumferential resistance of air is adjusted through the air quantity adjusting plate; c. the cross air area of the end close to the fan axis is the smallest and the cross air area of the end far away from the fan axis is the largest in a circumferential symmetrical unit, compared with the prior art, the operation is simple and flexible, the implementation is convenient, and the circumferential uniformity of the air flow can be improved; and the area of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed, and the circumferential temperature difference of the motor can be reduced to 10-20K.
Example 2
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is installed at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 45 degrees, an air quantity adjusting plate 27 is installed on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the large-diameter motor core comprises a rotor base 1, a rotor core 2 arranged on the rotor base 1, a plurality of rotor magnetic steels 3 axially arranged along the rotor core 2, and further comprises a plurality of sections of stator core sections 4, a first core pressing plate 5, a second core pressing plate 6 and a tensioning screw 7, wherein the stator core sections 4 are formed by laminating silicon steel sheets 8, a groove body 10 for placing a stator coil 9 is formed in each silicon steel sheet 8, a stator channel steel 11 is connected between any two adjacent sections of stator core sections 4, the two sections of stator core sections 4 and the stator channel steel 11 form a stator ventilation channel 12 for circulating a cooling medium, the tensioning screw 7 penetrates through the plurality of sections of stator core sections 4, one end of the tensioning screw 7 is fixedly connected with the first core pressing plate 5, and the other end of the tensioning screw 7 is fixedly connected with the second core pressing plate 6, an air gap 13 is arranged between the rotor magnetic steel 3 and the stator iron core section 4, a first circumferential ring plate 14 is fixedly connected to the multi-section stator iron core section 4, one end of the first circumferential ring plate 14 is fixedly connected with a first iron core pressing plate 5, the other end of the first circumferential ring plate 14 is fixedly connected with a second iron core pressing plate 6, at least three axial vertical plates 15 are fixedly connected to the inner wall of the first circumferential ring plate 14, an air inlet cavity 16 and an air outlet cavity 17 are formed between the first circumferential ring plate 14, the stator iron core section 4 and two adjacent axial vertical plates 15, the air inlet cavity 16 and the air outlet cavity 17 are arranged at intervals, a plurality of air inlet holes 18 and a plurality of air outlet holes 19 are formed in the first circumferential ring plate 14, the air inlet holes 18 are communicated with the corresponding air inlet cavities 16, the air outlet holes 19 are communicated with the corresponding air outlet cavities 17, a first vertical plate 20 and a second vertical plate 21 are fixedly connected to the outer wall of the first circumferential ring plate 14, a second circumferential ring plate 22 is fixedly connected between the first vertical plate 20 and the second vertical plate 21, the first vertical plate 20 is connected with an inclined wind shield 24 through a plurality of connecting plates 23, an air outlet pipe 25 communicated with the air outlet cavity 17 is connected to the second circumferential ring plate 22, and an air inlet pipe 26 communicated with the air inlet cavity 16 is connected to the first vertical plate 20.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core comprises a rotor base, a rotor iron core arranged on the rotor base, a plurality of rotor magnetic steels arranged along the axial direction of the rotor iron core, a plurality of sections of stator iron core sections, a first iron core pressing plate, a second iron core pressing plate and a tensioning screw rod, wherein the stator iron core sections are formed by laminating silicon steel sheets, a groove body for placing a stator coil is formed in each silicon steel sheet, a stator channel steel is connected between any two adjacent sections of stator iron core sections, the two sections of stator iron core sections and the stator channel steel form a stator ventilation channel for circulation of a cooling medium, the tensioning screw rod penetrates through the sections of stator iron core sections, one end of the tensioning screw rod is fixedly connected with the first iron core pressing plate, the other end of the tensioning screw rod is fixedly connected with the second iron core pressing plate, an air gap is arranged between the rotor, one end of a first circumferential ring plate is fixedly connected with a first iron core pressing plate, the other end of the first circumferential ring plate is fixedly connected with a second iron core pressing plate, at least three axial vertical plates are fixedly connected to the inner wall of the first circumferential ring plate, an air inlet cavity and an air outlet cavity are formed between the first circumferential ring plate, the stator iron core section and two adjacent axial vertical plates, the air inlet cavity and the air outlet cavity are arranged at intervals, a plurality of air inlet holes and a plurality of air outlet holes are formed in the first circumferential ring plate, the air inlet holes are communicated with the corresponding air inlet cavities, the air outlet holes are communicated with the corresponding air outlet cavities, a first vertical plate and a second vertical plate are fixedly connected to the outer wall of the first circumferential ring plate, a second circumferential ring plate is fixedly connected between the first vertical plate and the second vertical plate, the first vertical plate is connected with an oblique air baffle through a plurality of connecting plates, an air outlet pipe communicated with the air outlet cavities is connected to the second circumferential ring plate, an air inlet pipe communicated with the air inlet, when the motor operates, on one hand, high-speed airflow at the outlet of the fan impacts the inclined wind shield to cause circumferential diffusion and axial steering of the airflow, so that circumferential uniformity of the airflow can be improved; on the other hand, the areas of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed; the whole device has the advantages of simple structure, easy implementation, convenient adjustment and obvious effect, and can reduce the circumferential temperature difference of the motor by 10-20K.
Example 3
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is arranged at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 60 degrees, an air quantity adjusting plate 27 is arranged on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the large-diameter motor core comprises a rotor base 1, a rotor core 2 arranged on the rotor base 1, a plurality of rotor magnetic steels 3 axially arranged along the rotor core 2, and further comprises a plurality of sections of stator core sections 4, a first core pressing plate 5, a second core pressing plate 6 and a tensioning screw 7, wherein the stator core sections 4 are formed by laminating silicon steel sheets 8, a groove body 10 for placing a stator coil 9 is formed in each silicon steel sheet 8, a stator channel steel 11 is connected between any two adjacent sections of stator core sections 4, the two sections of stator core sections 4 and the stator channel steel 11 form a stator ventilation channel 12 for circulating a cooling medium, the tensioning screw 7 penetrates through the plurality of sections of stator core sections 4, one end of the tensioning screw 7 is fixedly connected with the first core pressing plate 5, and the other end of the tensioning screw 7 is fixedly connected with the second core pressing plate 6, an air gap 13 is arranged between the rotor magnetic steel 3 and the stator iron core section 4, a first circumferential ring plate 14 is fixedly connected to the multi-section stator iron core section 4, one end of the first circumferential ring plate 14 is fixedly connected with a first iron core pressing plate 5, the other end of the first circumferential ring plate 14 is fixedly connected with a second iron core pressing plate 6, at least three axial vertical plates 15 are fixedly connected to the inner wall of the first circumferential ring plate 14, an air inlet cavity 16 and an air outlet cavity 17 are formed between the first circumferential ring plate 14, the stator iron core section 4 and two adjacent axial vertical plates 15, the air inlet cavity 16 and the air outlet cavity 17 are arranged at intervals, a plurality of air inlet holes 18 and a plurality of air outlet holes 19 are formed in the first circumferential ring plate 14, the air inlet holes 18 are communicated with the corresponding air inlet cavities 16, the air outlet holes 19 are communicated with the corresponding air outlet cavities 17, a first vertical plate 20 and a second vertical plate 21 are fixedly connected to the outer wall of the first circumferential ring plate 14, a second circumferential ring plate 22 is fixedly connected between the first vertical plate 20 and the second vertical plate 21, the first vertical plate 20 is connected with an inclined wind shield 24 through a plurality of connecting plates 23, an air outlet pipe 25 communicated with the air outlet cavity 17 is connected to the second circumferential ring plate 22, and an air inlet pipe 26 communicated with the air inlet cavity 16 is connected to the first vertical plate 20.
The thickness of the silicon steel sheet 8 is 0.5 mm.
The plurality of air inlet holes 18 and the plurality of air outlet holes 19 provided on the first circumferential ring plate 14 are arranged in a staggered manner in the axial direction of the first circumferential ring plate 14 and are arranged at intervals in the circumferential direction of the first circumferential ring plate 14.
The rotor base 1, the first circumferential annular plate 14 and the first vertical plate 20 enclose a large cavity 28, the air inlet pipe 26 is communicated with the large cavity 28, and the large cavity 28 is communicated with the air inlet cavity 16.
A plurality of fresh air inlets and a plurality of exhaust vent that set up on the first circumferential ring board are at the axial of first circumferential ring board dislocation arrangement and at the interval arrangement in the circumference of first circumferential ring board and are arranged, can further improve the air current circumference degree of consistency, ensure good even radiating effect.
The rotor base, the first circumferential annular plate and the first vertical plate enclose a large cavity, the air inlet pipe is communicated with the large cavity, and the large cavity is communicated with the air inlet cavity, so that ventilation can be smooth, and the improvement of the heat dissipation effect is facilitated.
Example 4
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is arranged at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 60 degrees, an air quantity adjusting plate 27 is arranged on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the large-diameter motor core comprises a rotor base 1, a rotor core 2 arranged on the rotor base 1, a plurality of rotor magnetic steels 3 axially arranged along the rotor core 2, and further comprises a plurality of sections of stator core sections 4, a first core pressing plate 5, a second core pressing plate 6 and a tensioning screw 7, wherein the stator core sections 4 are formed by laminating silicon steel sheets 8, a groove body 10 for placing a stator coil 9 is formed in each silicon steel sheet 8, a stator channel steel 11 is connected between any two adjacent sections of stator core sections 4, the two sections of stator core sections 4 and the stator channel steel 11 form a stator ventilation channel 12 for circulating a cooling medium, the tensioning screw 7 penetrates through the plurality of sections of stator core sections 4, one end of the tensioning screw 7 is fixedly connected with the first core pressing plate 5, and the other end of the tensioning screw 7 is fixedly connected with the second core pressing plate 6, an air gap 13 is arranged between the rotor magnetic steel 3 and the stator iron core section 4, a first circumferential ring plate 14 is fixedly connected to the multi-section stator iron core section 4, one end of the first circumferential ring plate 14 is fixedly connected with a first iron core pressing plate 5, the other end of the first circumferential ring plate 14 is fixedly connected with a second iron core pressing plate 6, at least three axial vertical plates 15 are fixedly connected to the inner wall of the first circumferential ring plate 14, an air inlet cavity 16 and an air outlet cavity 17 are formed between the first circumferential ring plate 14, the stator iron core section 4 and two adjacent axial vertical plates 15, the air inlet cavity 16 and the air outlet cavity 17 are arranged at intervals, a plurality of air inlet holes 18 and a plurality of air outlet holes 19 are formed in the first circumferential ring plate 14, the air inlet holes 18 are communicated with the corresponding air inlet cavities 16, the air outlet holes 19 are communicated with the corresponding air outlet cavities 17, a first vertical plate 20 and a second vertical plate 21 are fixedly connected to the outer wall of the first circumferential ring plate 14, a second circumferential ring plate 22 is fixedly connected between the first vertical plate 20 and the second vertical plate 21, the first vertical plate 20 is connected with an inclined wind shield 24 through a plurality of connecting plates 23, an air outlet pipe 25 communicated with the air outlet cavity 17 is connected to the second circumferential ring plate 22, and an air inlet pipe 26 communicated with the air inlet cavity 16 is connected to the first vertical plate 20.
The thickness of the silicon steel sheet 8 is 0.35 mm.
The plurality of air inlet holes 18 and the plurality of air outlet holes 19 provided on the first circumferential ring plate 14 are arranged in a staggered manner in the axial direction of the first circumferential ring plate 14 and are arranged at intervals in the circumferential direction of the first circumferential ring plate 14.
The rotor base 1, the first circumferential annular plate 14 and the first vertical plate 20 enclose a large cavity 28, the air inlet pipe 26 is communicated with the large cavity 28, and the large cavity 28 is communicated with the air inlet cavity 16.
The ratio of the far fan end maximum air passing area 29 far away from the fan axis to the near fan end minimum air passing area 29 close to the fan axis is 2: 1.
Example 5
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is arranged at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 60 degrees, an air quantity adjusting plate 27 is arranged on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the large-diameter motor core comprises a rotor base 1, a rotor core 2 arranged on the rotor base 1, a plurality of rotor magnetic steels 3 axially arranged along the rotor core 2, and further comprises a plurality of sections of stator core sections 4, a first core pressing plate 5, a second core pressing plate 6 and a tensioning screw 7, wherein the stator core sections 4 are formed by laminating silicon steel sheets 8, a groove body 10 for placing a stator coil 9 is formed in each silicon steel sheet 8, a stator channel steel 11 is connected between any two adjacent sections of stator core sections 4, the two sections of stator core sections 4 and the stator channel steel 11 form a stator ventilation channel 12 for circulating a cooling medium, the tensioning screw 7 penetrates through the plurality of sections of stator core sections 4, one end of the tensioning screw 7 is fixedly connected with the first core pressing plate 5, and the other end of the tensioning screw 7 is fixedly connected with the second core pressing plate 6, an air gap 13 is arranged between the rotor magnetic steel 3 and the stator iron core section 4, a first circumferential ring plate 14 is fixedly connected to the multi-section stator iron core section 4, one end of the first circumferential ring plate 14 is fixedly connected with a first iron core pressing plate 5, the other end of the first circumferential ring plate 14 is fixedly connected with a second iron core pressing plate 6, at least three axial vertical plates 15 are fixedly connected to the inner wall of the first circumferential ring plate 14, an air inlet cavity 16 and an air outlet cavity 17 are formed between the first circumferential ring plate 14, the stator iron core section 4 and two adjacent axial vertical plates 15, the air inlet cavity 16 and the air outlet cavity 17 are arranged at intervals, a plurality of air inlet holes 18 and a plurality of air outlet holes 19 are formed in the first circumferential ring plate 14, the air inlet holes 18 are communicated with the corresponding air inlet cavities 16, the air outlet holes 19 are communicated with the corresponding air outlet cavities 17, a first vertical plate 20 and a second vertical plate 21 are fixedly connected to the outer wall of the first circumferential ring plate 14, a second circumferential ring plate 22 is fixedly connected between the first vertical plate 20 and the second vertical plate 21, the first vertical plate 20 is connected with an inclined wind shield 24 through a plurality of connecting plates 23, an air outlet pipe 25 communicated with the air outlet cavity 17 is connected to the second circumferential ring plate 22, and an air inlet pipe 26 communicated with the air inlet cavity 16 is connected to the first vertical plate 20.
The thickness of the silicon steel sheet 8 is 0.35 mm.
The plurality of air inlet holes 18 and the plurality of air outlet holes 19 provided on the first circumferential ring plate 14 are arranged in a staggered manner in the axial direction of the first circumferential ring plate 14 and are arranged at intervals in the circumferential direction of the first circumferential ring plate 14.
The rotor base 1, the first circumferential annular plate 14 and the first vertical plate 20 enclose a large cavity 28, the air inlet pipe 26 is communicated with the large cavity 28, and the large cavity 28 is communicated with the air inlet cavity 16.
The ratio of the far fan end maximum air passing area 29 far away from the fan axis to the near fan end minimum air passing area 29 close to the fan axis is 5: 1.
Example 6
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is arranged at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 60 degrees, an air quantity adjusting plate 27 is arranged on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the large-diameter motor core comprises a rotor base 1, a rotor core 2 arranged on the rotor base 1, a plurality of rotor magnetic steels 3 axially arranged along the rotor core 2, and further comprises a plurality of sections of stator core sections 4, a first core pressing plate 5, a second core pressing plate 6 and a tensioning screw 7, wherein the stator core sections 4 are formed by laminating silicon steel sheets 8, a groove body 10 for placing a stator coil 9 is formed in each silicon steel sheet 8, a stator channel steel 11 is connected between any two adjacent sections of stator core sections 4, the two sections of stator core sections 4 and the stator channel steel 11 form a stator ventilation channel 12 for circulating a cooling medium, the tensioning screw 7 penetrates through the plurality of sections of stator core sections 4, one end of the tensioning screw 7 is fixedly connected with the first core pressing plate 5, and the other end of the tensioning screw 7 is fixedly connected with the second core pressing plate 6, an air gap 13 is arranged between the rotor magnetic steel 3 and the stator iron core section 4, a first circumferential ring plate 14 is fixedly connected to the multi-section stator iron core section 4, one end of the first circumferential ring plate 14 is fixedly connected with a first iron core pressing plate 5, the other end of the first circumferential ring plate 14 is fixedly connected with a second iron core pressing plate 6, at least three axial vertical plates 15 are fixedly connected to the inner wall of the first circumferential ring plate 14, an air inlet cavity 16 and an air outlet cavity 17 are formed between the first circumferential ring plate 14, the stator iron core section 4 and two adjacent axial vertical plates 15, the air inlet cavity 16 and the air outlet cavity 17 are arranged at intervals, a plurality of air inlet holes 18 and a plurality of air outlet holes 19 are formed in the first circumferential ring plate 14, the air inlet holes 18 are communicated with the corresponding air inlet cavities 16, the air outlet holes 19 are communicated with the corresponding air outlet cavities 17, a first vertical plate 20 and a second vertical plate 21 are fixedly connected to the outer wall of the first circumferential ring plate 14, a second circumferential ring plate 22 is fixedly connected between the first vertical plate 20 and the second vertical plate 21, the first vertical plate 20 is connected with an inclined wind shield 24 through a plurality of connecting plates 23, an air outlet pipe 25 communicated with the air outlet cavity 17 is connected to the second circumferential ring plate 22, and an air inlet pipe 26 communicated with the air inlet cavity 16 is connected to the first vertical plate 20.
The thickness of the silicon steel sheet 8 is 0.35 mm.
The plurality of air inlet holes 18 and the plurality of air outlet holes 19 provided on the first circumferential ring plate 14 are arranged in a staggered manner in the axial direction of the first circumferential ring plate 14 and are arranged at intervals in the circumferential direction of the first circumferential ring plate 14.
The rotor base 1, the first circumferential annular plate 14 and the first vertical plate 20 enclose a large cavity 28, the air inlet pipe 26 is communicated with the large cavity 28, and the large cavity 28 is communicated with the air inlet cavity 16.
The ratio of the far fan end maximum air passing area 29 far away from the fan axis to the near fan end minimum air passing area 29 close to the fan axis is 8: 1.
Example 7
Referring to fig. 1-5, a method for reducing circumferential temperature difference between a coil and a core of an electric machine includes the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield 24 is arranged at an outlet of an air inlet pipe 26, an included angle between the inclined wind shield 24 and a first vertical plate 20 is 60 degrees, an air quantity adjusting plate 27 is arranged on an air inlet hole 18, the air quantity adjusting plate 27 is hinged with a first circumferential ring plate 14, and circumferential resistance of air is adjusted through the air quantity adjusting plate 27;
c. the proximal fan end air passing area 29 close to the fan axis is minimized and the distal fan end air passing area 29 away from the fan axis is maximized in a circumferentially symmetrical unit.
The device for reducing the circumferential temperature difference between the large-diameter motor coil and the large-diameter motor core comprises a rotor base 1, a rotor core 2 arranged on the rotor base 1, a plurality of rotor magnetic steels 3 axially arranged along the rotor core 2, and further comprises a plurality of sections of stator core sections 4, a first core pressing plate 5, a second core pressing plate 6 and a tensioning screw 7, wherein the stator core sections 4 are formed by laminating silicon steel sheets 8, a groove body 10 for placing a stator coil 9 is formed in each silicon steel sheet 8, a stator channel steel 11 is connected between any two adjacent sections of stator core sections 4, the two sections of stator core sections 4 and the stator channel steel 11 form a stator ventilation channel 12 for circulating a cooling medium, the tensioning screw 7 penetrates through the plurality of sections of stator core sections 4, one end of the tensioning screw 7 is fixedly connected with the first core pressing plate 5, and the other end of the tensioning screw 7 is fixedly connected with the second core pressing plate 6, an air gap 13 is arranged between the rotor magnetic steel 3 and the stator iron core section 4, a first circumferential ring plate 14 is fixedly connected to the multi-section stator iron core section 4, one end of the first circumferential ring plate 14 is fixedly connected with a first iron core pressing plate 5, the other end of the first circumferential ring plate 14 is fixedly connected with a second iron core pressing plate 6, at least three axial vertical plates 15 are fixedly connected to the inner wall of the first circumferential ring plate 14, an air inlet cavity 16 and an air outlet cavity 17 are formed between the first circumferential ring plate 14, the stator iron core section 4 and two adjacent axial vertical plates 15, the air inlet cavity 16 and the air outlet cavity 17 are arranged at intervals, a plurality of air inlet holes 18 and a plurality of air outlet holes 19 are formed in the first circumferential ring plate 14, the air inlet holes 18 are communicated with the corresponding air inlet cavities 16, the air outlet holes 19 are communicated with the corresponding air outlet cavities 17, a first vertical plate 20 and a second vertical plate 21 are fixedly connected to the outer wall of the first circumferential ring plate 14, a second circumferential ring plate 22 is fixedly connected between the first vertical plate 20 and the second vertical plate 21, the first vertical plate 20 is connected with an inclined wind shield 24 through a plurality of connecting plates 23, an air outlet pipe 25 communicated with the air outlet cavity 17 is connected to the second circumferential ring plate 22, and an air inlet pipe 26 communicated with the air inlet cavity 16 is connected to the first vertical plate 20.
The thickness of the silicon steel sheet 8 is 0.35 mm.
The plurality of air inlet holes 18 and the plurality of air outlet holes 19 provided on the first circumferential ring plate 14 are arranged in a staggered manner in the axial direction of the first circumferential ring plate 14 and are arranged at intervals in the circumferential direction of the first circumferential ring plate 14.
The rotor base 1, the first circumferential annular plate 14 and the first vertical plate 20 enclose a large cavity 28, the air inlet pipe 26 is communicated with the large cavity 28, and the large cavity 28 is communicated with the air inlet cavity 16.
The ratio of the far fan end maximum air passing area 29 far away from the fan axis to the near fan end minimum air passing area 29 close to the fan axis is 10: 1.
A, mounting a device for reducing the circumferential temperature difference between a large-diameter motor coil and an iron core on a wind driven generator; b. an inclined wind shield is arranged at an outlet of the air inlet pipe, an included angle between the inclined wind shield and the first vertical plate is 30-60 degrees, an air volume adjusting plate is arranged on the air inlet hole, the air volume adjusting plate is hinged with the first circumferential ring plate, and circumferential resistance of air is adjusted through the air volume adjusting plate; c. the cross air area of the end close to the fan axis is the smallest and the cross air area of the end far away from the fan axis is the largest in a circumferential symmetrical unit, compared with the prior art, the operation is simple and flexible, the implementation is convenient, and the circumferential uniformity of the air flow can be improved; and the area of different air inlet holes can be adjusted by adjusting the size of the air inlet holes which are shielded by the air volume adjusting plate according to actual needs so as to realize circumferential uniform distribution of air speed, and the circumferential temperature difference of the motor can be reduced to 10-20K.
The ratio of the maximum overfire area of the far fan end far away from the axis of the fan to the minimum overfire area of the near fan end close to the axis of the fan is 10:1, the specific area ratio is adopted, the requirements of the total air quantity and the air quantity uniformity of the motor are considered, and the circumferential temperature difference of the motor can be effectively reduced.
Claims (5)
1. A method for reducing circumferential temperature difference between a motor coil and an iron core is characterized by comprising the following steps:
a. installing a device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core on a wind driven generator;
b. an inclined wind shield (24) is arranged at an outlet of an air inlet pipe (26), an included angle between the inclined wind shield (24) and a first vertical plate (20) is 30-60 degrees, an air quantity adjusting plate (27) is arranged on an air inlet hole (18), the air quantity adjusting plate (27) is hinged with a first circumferential ring plate (14), and circumferential resistance of air is adjusted through the air quantity adjusting plate (27);
c. in a circumferential symmetrical unit, the air passing area (29) at the end close to the fan axis is the smallest, and the air passing area (29) at the end far away from the fan axis is the largest;
the device for reducing the circumferential temperature difference between the large-diameter motor coil and the iron core comprises a rotor base (1), a rotor iron core (2) arranged on the rotor base (1), a plurality of rotor magnetic steels (3) axially arranged along the rotor iron core (2), a plurality of sections of stator iron core sections (4), a first iron core pressing plate (5), a second iron core pressing plate (6) and a tensioning screw (7), wherein the stator iron core sections (4) are formed by laminating silicon steel sheets (8), groove bodies (10) used for placing stator coils (9) are formed in the silicon steel sheets (8), a stator channel steel (11) is connected between any two adjacent sections of stator iron core sections (4), the two sections of stator iron core sections (4) and the stator channel steel (11) form a stator ventilation groove (12) used for circulation of a cooling medium, and the tensioning screw (7) penetrates through the plurality of sections of stator iron core sections (4), one end of a tensioning screw rod (7) is fixedly connected with a first iron core pressing plate (5), the other end of the tensioning screw rod (7) is fixedly connected with a second iron core pressing plate (6), an air gap (13) is arranged between a rotor magnetic steel (3) and a stator iron core section (4), a first circumferential annular plate (14) is fixedly connected onto a multi-section stator iron core section (4), one end of the first circumferential annular plate (14) is fixedly connected with the first iron core pressing plate (5), the other end of the first circumferential annular plate (14) is fixedly connected with the second iron core pressing plate (6), at least three axial vertical plates (15) are fixedly connected onto the inner wall of the first circumferential annular plate (14), an air inlet cavity (16) or an air outlet cavity (17) is formed among the first circumferential annular plate (14), the stator iron core section (4) and two adjacent axial vertical plates (15), and the air inlet cavity (16) and the air outlet cavity (17) are arranged at intervals, open on first circumferential ring board (14) and have a plurality of fresh air inlet (18) and a plurality of exhaust vent (19), fresh air inlet (18) are linked together with corresponding air inlet chamber (16), and exhaust vent (19) are linked together with corresponding air-out chamber (17), fixedly connected with first riser (20) and second riser (21) on the outer wall of first circumferential ring board (14), fixedly connected with second circumferential ring board (22) between first riser (20) and second riser (21), first riser (20) are connected with one slant deep bead (24) through a plurality of connecting plates (23), be connected with on second circumferential ring board (22) with air-out chamber (17) communicating tuber pipe (25), be connected with on first riser (20) with communicating air-supply line (26) in chamber (16).
2. The method of claim 1, wherein the step of reducing the circumferential temperature difference between the coil and the core comprises: the thickness of the silicon steel sheet (8) is 0.5mm or 0.35 mm.
3. The method of claim 1, wherein the step of reducing the circumferential temperature difference between the coil and the core comprises: the plurality of air inlet holes (18) and the plurality of air outlet holes (19) arranged on the first circumferential ring plate (14) are arranged in a staggered mode in the axial direction of the first circumferential ring plate (14) and are arranged at intervals in the circumferential direction of the first circumferential ring plate (14).
4. The method of claim 1, wherein the step of reducing the circumferential temperature difference between the coil and the core comprises: the rotor base (1), the first circumferential annular plate (14) and the first vertical plate (20) enclose a large cavity (28), the air inlet pipe (26) is communicated with the large cavity (28), and the large cavity (28) is communicated with the air inlet cavity (16).
5. The method of claim 1, wherein the step of reducing the circumferential temperature difference between the coil and the core comprises: the ratio of the maximum air passing area (29) of the far fan end far away from the fan axis to the minimum air passing area (29) of the near fan end close to the fan axis is 2:1-10: 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813713.2A CN110429747B (en) | 2019-08-30 | 2019-08-30 | Method for reducing circumferential temperature difference between motor coil and iron core |
| EP20858731.1A EP4007131A4 (en) | 2019-08-30 | 2020-08-28 | Method and apparatus for reducing circumferential temperature difference between coil and iron core of motor |
| PCT/CN2020/112046 WO2021037194A1 (en) | 2019-08-30 | 2020-08-28 | Method and apparatus for reducing circumferential temperature difference between coil and iron core of motor |
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| CN201910813713.2A CN110429747B (en) | 2019-08-30 | 2019-08-30 | Method for reducing circumferential temperature difference between motor coil and iron core |
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| CN110429747B true CN110429747B (en) | 2020-11-20 |
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| WO2021037194A1 (en) * | 2019-08-30 | 2021-03-04 | 东方电气集团东方电机有限公司 | Method and apparatus for reducing circumferential temperature difference between coil and iron core of motor |
| CN110429746B (en) * | 2019-08-30 | 2020-11-20 | 东方电气集团东方电机有限公司 | Device capable of reducing circumferential temperature difference between large-diameter motor coil and iron core |
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| EP0013658A1 (en) * | 1979-01-10 | 1980-07-23 | Siemens Aktiengesellschaft | Self-ventilating electric machine |
| EP1100184A1 (en) * | 1999-11-09 | 2001-05-16 | Alstom | Motor ventilating device and electric traction motor provided with this device |
| CN101227110A (en) * | 2007-01-15 | 2008-07-23 | 株式会社日立制作所 | Forced cooling rotary electric machine |
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