KR20160079611A - Ventilative channel steel as well as manufacturing method, ventilating structure and motor thereof - Google Patents
Ventilative channel steel as well as manufacturing method, ventilating structure and motor thereof Download PDFInfo
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- KR20160079611A KR20160079611A KR1020150092166A KR20150092166A KR20160079611A KR 20160079611 A KR20160079611 A KR 20160079611A KR 1020150092166 A KR1020150092166 A KR 1020150092166A KR 20150092166 A KR20150092166 A KR 20150092166A KR 20160079611 A KR20160079611 A KR 20160079611A
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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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The present invention provides a ventilation groove shape, a manufacturing method thereof, a ventilation structure, and a motor. The ventilation-groove-shaped steel provided by the present invention includes at least four ventilation-space-shaped steel sections that are in contact with each other in succession, and the subtended angle between the ventilation-space-shaped sections of the adjacent ventilation slots in each of the two sections is less than 180 degrees, The sections of the ventilation grooved sections located on both sides of the section of the ventilation grooves which are in contact with each other in each of the three sections are distributed on both sides of the section of the ventilation groove section located in the middle. According to the ventilation groove shape steel provided in the present invention, the multi-switching structure therein can effectively break the boundary layer between the ventilation groove-shaped steel and the cooling gas flowing through the ventilation groove, increase the heat radiation area and enhance the cooling heat radiation effect, The supporting strength of the ventilation groove can be secured.
Description
BACKGROUND OF THE
When a motor (including an electric motor and a generator) is operated, energy is consumed in a member such as a coil and an iron core, and the consumption of this part is finally radiated in the form of heat energy. If the ventilation design of the motor is not reasonable, The temperature of the motor excessively increases or the temperature rise partially becomes non-uniform. If the temperature rises excessively, the insulation will deteriorate due to the aging of the insulation, resulting in a deterioration in the insulation performance of the insulation. Partially, if the temperature rise is not uniform, a very large thermal stress is generated, causing permanent damage to the motor structure, . Therefore, decreasing the temperature rise of the motor has an important meaning in increasing the safety margin of the motor, extending the service life of the motor, and reducing the maintenance cost of the motor.
Radial ventilation cooling is one of the common cooling schemes for small and medium sized generators. Such cooling schemes have been widely used because they increase the heat dissipation area and improve the power density of the motor. In order to achieve radial ventilation, the iron core of the motor is generally divided into a plurality of core segments, and between the adjacent core segments there is provided a ventilation groove (or "vent strip") along the radial direction of the motor And the ventilation groove shapes the space between the core segments adjacent to each other while dividing the space between adjacent core segments into a ventilation groove (or a "ventilation channel in a radial direction"), and the ventilation groove The radial ventilation proceeds to cool and dissipate the iron core and the windings. The generally used ventilation grooves are generally rectangular in cross-section and the cross-section of the " elliptical "venting grooves is" Quot; or "ellipse " shape.
In the process of realizing the above technical solution, the inventor has discovered that at least the following problems exist in the existing technologies.
The design of existing vent grooves and vent structures did not specifically pay attention to the effect of the vent grooves on the cooling effect of the cooling gas. Existing ventilation grooves only serve to support and form the ventilation grooves between adjacent core segments. According to the analysis and the accident of the inventor, the shape of the ventilation groove groove greatly influences the flow of the cooling gas in the ventilation groove, thereby determining the superiority of the cooling performance of the motor. According to the different shape of the ventilation groove shape, The turbulence state of the cooling gas flowing through the motor is different and affects the heat radiation coefficient and the partial pressure drop of the motor surface, and ultimately affects the temperature rise of the motor. Therefore, the shape design of ventilation grooves is a key technology, and the design of the ventilation grooves has a certain level of difficulty because the design of the venting grooves requires consideration of factors such as fairness, reliability of installation and cost. The inventors have found that although vented slotted sections play an important role, there is currently relatively little research in this area.
It is an object of the present invention to provide a ventilation groove shape steel capable of enhancing cooling heat radiation effect and a manufacturing method thereof, and to provide a ventilation structure and a motor having a better cooling heat radiation effect.
In order to achieve the above-mentioned object, the present invention is characterized in that it comprises at least four ventilation-groove-shaped section sections which are in contact with each other in succession, the subtended angle between ventilation- And the ventilation groove section of the ventilation groove section located on both sides of the section of the ventilation groove section adjacent to each of the three sections successively provides ventilation groove sections distributed on both sides of the ventilation groove section of the middle section.
It is preferable that the ventilation groove section sections adjacent to each other of two sections of the section section can be integrally contacted with each other.
Further, the chamber may be provided at a position adjacent to each other between adjacent sections of the ventilation groove section of each of the two sections, and the chamfer is positioned on the side of the inclined angle smaller than 180 占 of the abutting section.
It is preferable that the ventilation groove-shaped steel be of a ripple type.
It is desirable that the sections of the ventilation groove sections adjacent to each other of the two sections are attachable to each other.
The average width is twice as large as the distance from the middle connecting line of the ventilation groove section of the two adjacent sections to the adjacent sections of the ventilation groove section of the adjacent sections, It is preferable to be able to increase sequentially from the opposite wind end to the wind end of the section steel.
It is preferable that the average spacing is twice as long as the connecting line of the midpoint of the ventilation groove section of the two sections adjacent to each other and that the average interval can be sequentially decreased from the wind direction to the wind direction end of the ventilation groove shape Do.
The present invention relates to a stator comprising at least two core segments provided with a plurality of teeth, grooves for receiving windings between adjacent tooth portions of the same core segment, wherein corresponding grooves of adjacent core segments And a ventilation structure in which any of the above-mentioned ventilation grooves is provided between the ventilation holes.
The present invention provides a motor including the ventilation structure.
According to the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: placing a semi-finished product in a mold cavity of a press mold; punching the semi-finished product to form at least four sections of ventilated- The angle of inclination between adjacent sections of the ventilation groove section is less than 180 °, and the section of the ventilation groove section located on both sides of the section of the ventilation groove section adjacent to each other in each of the three sections is located in the middle of the ventilation groove section A method of manufacturing the ventilation structure distributed on both sides is provided.
In addition, the present invention provides a method of manufacturing a strip-shaped semi-finished product, comprising the steps of: cutting a raw material to obtain a strip-shaped semi-finished product; Wherein at least four sections of the ventilation groove section are sequentially attached to each other so that the subtended angles between adjacent sections of the ventilation groove section of each of the two sections are smaller than 180 DEG, And a step of distributing the sections of the ventilation groove sections located on both sides of the section of the groove section to both sides of the vent section of the ventilation groove section located in the middle.
The method includes cutting a raw material to obtain a strip-shaped semi-finished product, and bending the strip-shaped semi-finished product so that the strip-shaped semi-finished product forms at least four sections of a ventilation groove-like steel section, The angle of inclination between adjacent sections of the ventilation groove sections of the two sections is less than 180 °. In addition, the sections of the ventilation groove sections located on both sides of the ventilation groove section of the sections adjacent to each other in succession are in the middle ventilation The present invention further provides a method of manufacturing the above-mentioned ventilation-slot-shaped steel distributed on both sides of a groove section.
The ventilation groove shape steel provided by the present invention mainly has the following advantageous effects. The unique multi turn structure effectively breaks the boundary layer between the ventilation groove and the cooling gas flowing through the ventilation groove, thereby significantly increasing the turbulence of the cooling gas, thereby enhancing the cooling ability of the cooling gas and enhancing the cooling heat dissipation effect It is possible to increase the contact area between the cooling gas and the ventilation groove to increase the heat radiation of the ventilation groove itself and to secure the supporting strength of the ventilation groove while reducing the raw material.
The ventilation structure and the motor provided by the present invention have the above-mentioned advantages of the ventilation groove shape steel, so that the cooling heat radiation effect is better, the temperature rise is effectively reduced, the reliability is improved, and the cost can be reduced.
The manufacturing method of the ventilation groove shape steel provided by the present invention is simple in the manufacturing process and easy to realize, and the ventilation groove shape steel produced and produced has the above advantages.
1 is a structural schematic diagram of a ventilation groove-shaped steel according to
2 is a structural schematic diagram of a ventilation groove-shaped steel according to
3 is a structural schematic diagram of a ventilation groove-shaped steel of
4 is a structural schematic diagram of a ventilation groove shape steel according to
5 is a structural schematic diagram of a ventilation groove-shaped steel according to Embodiment 5 of the present invention.
6 is a structural schematic diagram of the ventilation groove shape steel of the sixth embodiment of the present invention.
7 is a perspective view of a ventilation structure according to a seventh embodiment of the present invention.
8 is a schematic cross-sectional view of a ventilation structure according to a seventh embodiment of the present invention.
9 is a flowchart of a method of manufacturing a ventilation groove-shaped steel according to the eighth embodiment of the present invention.
10 is a flowchart of a method of manufacturing a ventilation groove-shaped steel according to the ninth embodiment of the present invention.
11 is a flowchart of a method of manufacturing a ventilation groove-shaped steel according to the tenth embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Example 1
As shown in Fig. 1, Fig. 1 is a structural schematic view of a ventilation groove-shaped steel according to
The ventilation groove of the first embodiment of the present invention is different from the conventional ventilation grooves of the conventional art and the ventilation groove of the strip type, Since the inclined angle is smaller than 180 degrees, the entire ventilation groove shape is not in a straight line but shows a multi-switching structure. In the
1. By effectively breaking the boundary layer between the ventilation groove and the cooling gas flowing through the ventilation groove, the cooling gas flowing on both sides of the ventilation groove can be guided to the windings on both sides of the ventilation groove, so that the cooling gas can be returned to the windings , The turbulence of the cooling gas is remarkably increased, and the cooling gas is sufficiently brought into contact with the windings of the ventilation groove-shaped steel and both sides thereof, so that the cooling ability and cooling heat radiation effect of the cooling gas can be enhanced.
2. It is possible to increase the contact area between the cooling gas and the ventilation groove by enlarging the boundary of the ventilation groove, thereby enhancing the heat dissipation of the ventilation groove itself, thereby increasing the temperature of the motor winding without increasing the resistance to the motor cooling system Effectively.
3. Due to the use of the multi-switching structure, the width of each
It should be noted that the term "touching each other" in the present embodiment is not interpreted as being limited to "connected to each other" but its meaning includes "connected to each other" and " . In the case of "connected to each other", not only can they be connected together, but they can also be connected by other connection methods such as welding. In addition to being able to contact (or touch each other) You can leave a gap. This point will be implemented in the following description.
In addition to the features provided with the above-described multi-switching structure, the vented-groove-shaped steel of the present embodiment further includes other features, which will be described below.
The ventilation channel generally has a reverse wind stage and a wind wind stage. The reverse wind stage corresponds to one end of the cooling gas upstream, and the wind wind end corresponds to one end of the cooling gas downstream. If the distance between the center connecting line of the
In this embodiment, the ventilation-space-shaped
Example 2
As shown in Fig. 2, Fig. 2 is a structural schematic diagram of a ventilation groove-shaped steel of
In addition, the number of sections of the ventilated-groove-shaped
Example 3
As shown in Fig. 3, Fig. 3 is a structural schematic diagram of the ventilation groove-shaped steel of the third embodiment of the present invention. The main distinguishing points between the ventilation-groove-shaped steel of this embodiment and the ventilation-groove-shaped steel of this embodiment are as follows. The ventilation groove-shaped steel of this embodiment is of the ripple type. Since the ripple type itself has a multi-switching shape, the design of the ripple type allows the surface of the ventilation groove-shaped steel to come in contact with the cooling base material to be streamlined so that the ventilation groove-shaped steel can have a very small wind resistance. This type of use can also increase the heat dissipation area by an appropriate amount compared to the use of existing ventilation grooves.
Example 4
As shown in Fig. 4, Fig. 4 is a structural schematic diagram of the ventilation groove-shaped steel of the fourth embodiment of the present invention. The main distinguishing points between the ventilation groove-shaped steel of this embodiment and the ventilation-groove-shaped steel according to the above embodiment are as follows. The ventilated-hole-shaped
Example 5
As shown in FIG. 5, FIG. 5 is a structural schematic diagram of a ventilation groove-shaped steel of Example 5 of the present invention. The distinction between the ventilation groove-shaped steel of this embodiment and the ventilation-groove-shaped steel of the above embodiment is as follows. (Based on the above-described definition of the average width (between the connecting line of the middle point of the ventilated-groove-shaped
Example 6
As shown in Fig. 6, Fig. 6 is a structural schematic diagram of the ventilation groove-shaped steel of the sixth embodiment of the present invention. The ventilation grooves according to each of the above embodiments are formed so that the average spacing is defined as twice the length of the connection line of the center point of the
As described above, the ventilation grooves of the respective embodiments of the present invention have been described. As can be seen from the above description, the ventilation groove shape steel provided by the present invention has a relatively large flexibility. For example, the number of sections of the ventilation groove shape section is determined according to the size of the motor and the heat radiation requirement . Further, the multi-turn (curved) structure of the ventilation groove-shaped steel may be a continuous integrated structure or may be formed in a divided form so that a plurality of ventilation-groove-shaped steel sections may be formed by attaching to each other. In addition, a ventilation groove can be a ripple type. Further, the curvature intervals of the ventilation groove-shaped grooves may be uniform or non-uniform. In addition, the average widths of the both ends of the ventilation groove sections may be the same or different, and the center heat radiation region of the windings may be adjusted based on the groove pitch or groove bottom. In addition, since the ventilation groove shape steel provided by the present invention is easily realized, it is possible to easily adjust the design of the ventilation groove shape steel to satisfy various practical cooling and heat radiation requirements.
On the basis of the feature that the ventilation groove steel provided by the present invention has a multi-switching structure, the venting groove steel provided by the present invention may also be referred to as "multi-conversion ventilation groove steel. &Quot; The term "vented slotted profile" is a generalized name for motor cooling technology, which distinguishes itself from "grooved" steels in which the cross-section of other fields is groove-like, and the material itself is not limited to "steel" , The material may also be a metal having a relatively high thermal conductivity coefficient. Hereinafter, the ventilation structure of the embodiment of the present invention will be described.
Example 7
As shown in FIGS. 7 and 8, FIG. 7 is a perspective view of a ventilation structure according to a seventh embodiment of the present invention, which shows a shape observed from the outside of the ventilation structure. FIG. 8 is a cross-sectional schematic view of a ventilation structure according to a seventh embodiment of the present invention, which shows a shape when observed inside the ventilation structure. The ventilation structure of the embodiment of the present invention includes at least two (for example, three shown in the figure)
When the ventilation structure of the present embodiment is operated, the cooling gas flows along the direction indicated by the dotted arrow in Fig. 8 in the ventilation groove, and the cooling gas is guided by the
As a result of the verification simulation using the flow field calculation software on the basis of the above structure and the verification through the experimental platform, the inventors have found that the ventilation grooves of the above- The temperature rise of the windings can be effectively reduced, which can greatly increase the safety margin of the motor, extend its service life and reduce maintenance costs. If the temperature rise of the motor is kept unchanged, it can be combined with the optimized design of the motor to increase the power density, reduce the weight, and reduce the cost. For example, if it is designed according to the motor insulation class B and the unchanged temperature rise of 90K is maintained, 5% of the amount of copper used can be saved directly by arranging the ventilation groove.
In this embodiment, a
The ventilation structure provided in this embodiment can be applied to a motor such as a conventional air-cooled generator, an electric motor and the like. For example, the ventilation structure can be applied to a large wind power generator, a small- Not only significantly improves but also realizes the process easily and has a wide range of application prospects. Hereinafter, a method for manufacturing a ventilation groove-shaped steel according to an embodiment of the present invention will be described, and the above drawings can be referred to when reading out the method for manufacturing the ventilation-groove shaped steel of the embodiment of the present invention.
Example 8
As shown in Fig. 9, Fig. 9 is a flowchart of a method of manufacturing a ventilation groove-shaped steel according to the eighth embodiment of the present invention. The manufacturing method of this embodiment includes a
The punching in the manufacturing method of the ventilation groove shape steel of the present embodiment is easy to realize, the primary molding is possible, the manufacturing process is simple, and any one of the first, second, third, It can be used in the production of ventilation groove shapes, and the ventilation grooves thus obtained have an integrated structure as a whole.
Specifically, in
Example 9
As shown in Fig. 10, Fig. 10 is a flowchart of a method of manufacturing a ventilation groove-shaped steel according to the ninth embodiment of the present invention. The manufacturing method of this embodiment includes a
The cutting and welding process in the manufacturing method of the ventilation groove steel of the present embodiment is easy to realize and the manufacturing process is simple, so that it can be used for manufacturing the ventilation groove steel of the above-mentioned
Specifically, in
Example 10
As shown in Fig. 11, Fig. 11 is a flowchart of a method of manufacturing a ventilation groove-shaped steel according to Embodiment 10 of the present invention. The manufacturing method of this embodiment includes a
The cutting and bending process in the manufacturing method of the ventilation groove shape steel of the present embodiment is easy to realize and the manufacturing process is simple, so that the ventilation groove shape of any one of the first, second, third, fifth, For example.
Specifically, in
In view of the above, the preferred technical solution provided in the embodiment of the present invention has at least the following features.
1. By designing the ventilation grooved steel in a multi-switching structure, the boundary layer between the channel steel and the cooling air is effectively deflected to increase the turbulence effect, so that the cooling wind, the channel steel, Strengthen to the maximum and enhance the cooling ability of the cooling gas, and the ventilation grooved type complements the single blank. At the same time, the multi-switching structure also enlarges the ventilation groove boundary to increase the heat dissipation area. According to Finite Element Analysis and actual measurement results, different types of channel steels can effectively reduce the temperature of the motor windings from 3 to 6K. In addition, the multi-switching structure can realize the effect of increasing the supporting strength while reducing the raw material.
2. It is possible to realize mass production by constructing the ventilation groove steel by attaching the section of the ventilation groove section of a plurality of sections, and the production cost can be greatly reduced.
It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. All of which are within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the present invention.
1: Ventilation groove section 11: Ventilation groove section
111: chamfer 121:
122: wind wind stage 2: core segment
21: serration 3: winding
4: slot wedge
Claims (12)
And the ventilation groove section sections adjacent to each other in the two sections are integrally abutted with each other.
Wherein a chamfer is provided in contact with adjacent sections of the ventilation groove section of each of the two sections, and the chamfer is located at a side of the inclined angle smaller than 180 占 of the area where the sections are in contact with each other.
Wherein the ventilation groove is of a ripple type.
And the ventilation groove section sections adjacent to each other in the two sections are attached to each other.
The average width is twice the distance from the connection point of the middle point of the ventilation groove section of the two sections adjacent to each other to the section where the sections of the ventilation groove section of the adjacent sections are in contact with each other, And the ventilation groove shape steel is sequentially increased from the forward wind end to the forward wind end of the ventilation groove shape steel.
Characterized in that the average distance is twice the length of the connecting line of the midpoint of the ventilation groove section of the two sections adjacent to each other and the average spacing gradually decreases from the wind direction to the wind direction end of the ventilation groove section Section steel.
Wherein grooves for receiving the windings are formed between adjacent tooth portions of the same core segment, and between the corresponding tooth portions of the core segments adjacent to each other, a ventilation groove shaped groove according to any one of Claims 1 to 7 And the ventilation structure is provided.
And punching the semi-finished products so as to form at least four sections of ventilation-space-shaped sections of a groove which are in contact with each other,
Among them, the angle of inclination between adjacent sections of the ventilation groove section of each section is smaller than 180 °, and the section of the ventilation groove section located on both sides of the section of the ventilation groove section, which is in contact with each other sequentially in every three sections, The method according to any one of claims 1 to 4, wherein the ventilation groove is distributed on both sides of the ventilation groove section.
Dividing the strip-shaped semi-finished product to obtain a ventilated-groove-shaped semi-finished product;
Wherein at least four sections of the ventilation groove section are sequentially attached to each other so that the subtended angles between adjacent sections of the ventilation groove section of each of the two sections are smaller than 180 DEG, The method as claimed in claim 5, comprising the step of distributing the sections of the ventilation groove sections located on both sides of the section of the groove section to both sides of the vent section of the ventilation groove section located in the middle.
And bending the strip-shaped semi-finished product so that the strip-shaped semi-finished product forms at least four sections of the ventilated-
Of these, the inclined angles between adjacent sections of the ventilation groove section of each of the two sections are smaller than 180 占 and the sections of the ventilation groove sections located on both sides of the ventilation groove section in succession in each of the three sections are intermediate Wherein the ventilation groove is distributed on both sides of the section of the ventilation groove section located in the ventilation groove section.
Applications Claiming Priority (2)
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CN201410835452.1A CN104578484B (en) | 2014-12-26 | 2014-12-26 | Ventilation channel steel, manufacturing method thereof, ventilation structure and motor |
CN201410835452.1 | 2014-12-26 |
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KR101719061B1 KR101719061B1 (en) | 2017-03-22 |
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CN106329758B (en) * | 2016-08-29 | 2019-03-01 | 北京航空航天大学 | A kind of motor stator ventilation steel channel structure |
CN106253512A (en) * | 2016-08-29 | 2016-12-21 | 哈尔滨理工大学 | It is beneficial to the large-size machine stator ventilation steel channel structure of heat radiation |
CN106300744A (en) * | 2016-08-29 | 2017-01-04 | 哈尔滨理工大学 | Ventilation structure simultaneous with polytype channel-section steel |
CN106300708B (en) * | 2016-08-29 | 2019-02-22 | 北京航空航天大学 | A kind of motor rotor ventilation structure for installing three channel steels |
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US5814910A (en) * | 1995-09-06 | 1998-09-29 | Eldim, Inc. | Cooling vanes for rotating electric machinery |
US7728468B2 (en) * | 2004-10-28 | 2010-06-01 | Siemens Aktiengesellschaft | Laminations with integrated spacing feature for an electric machine, and method of making a lamination |
JP2014155314A (en) * | 2013-02-08 | 2014-08-25 | Hitachi Ltd | Rotary electric machine |
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2014
- 2014-12-26 CN CN201410835452.1A patent/CN104578484B/en active Active
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2015
- 2015-06-29 KR KR1020150092166A patent/KR101719061B1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US5814910A (en) * | 1995-09-06 | 1998-09-29 | Eldim, Inc. | Cooling vanes for rotating electric machinery |
US7728468B2 (en) * | 2004-10-28 | 2010-06-01 | Siemens Aktiengesellschaft | Laminations with integrated spacing feature for an electric machine, and method of making a lamination |
JP2014155314A (en) * | 2013-02-08 | 2014-08-25 | Hitachi Ltd | Rotary electric machine |
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CN104578484B (en) | 2017-12-08 |
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