JP2010115012A - Stator core and power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core which requires no machining in such a state that many core plates are stacked, and suppresses or prevents the saturation of magnetic flux for smooth rotational operation. <P>SOLUTION: The stator core includes a first core plate 31 having flat portions 31a at parts facing each other, and a circular second core plate 32 having a diameter 32x identical or similar to the shortest distance 31x connecting the flat portions 31a to each other through the center of the first core plate 31. A bundle 31T of the first core plates 31 and a bundle of the second core plates 32 are alternately stacked along the axial direction of a casing 2. The first core plates 31 are arrayed in an axial direction while being displaced in the circumferential direction by each constant rotational angle. A flat surface region 3A formed with the flat portion 31a of the first core plates 31 has a skewed shape tilted at a predetermined angle with respect to the axial direction of the casing 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a stator core and a generator.

  As a generator having a cylindrical casing and a stator core disposed in the casing, a planar region extending along the axial direction is formed on the outer surface of the stator core to prevent excessive heat generation. An aspect is considered in which a gap formed between the outer surface and the outer surface functions as a refrigerant flow path through which the refrigerant can flow (see Patent Document 1).

In this document, a core plate (steel plate) having a substantially disc shape and having flat portions formed on the outer periphery facing each other across the center is laminated in the axial direction so that the flat portions are flush with each other. The structure which formed the planar area | region parallel to an axial direction on the outer surface of this is disclosed.
JP 2007-209134 A

  By the way, the distance from the center of the first core plate to the flat portion is naturally shorter than the distance from the center to the arcuate outer peripheral portion, and accordingly, the path of magnetic flux (magnetic path) is also narrowed.

  However, the magnetic path is narrow as long as the flat area is formed in parallel to the axial direction and the flat portion faces the same direction in any cross section orthogonal to the axial direction of the stator core as in the above-described aspect. There is a problem that the portion is continuous in the same place along the axial direction, and the magnetic flux is easily saturated. Further, it is known that the iron loss increases at the portion where the magnetic flux is saturated, and there is room for improvement in the above-described aspect also in this respect.

  Furthermore, the well-known stator core, which is formed by laminating disk-shaped core plates that do not have a flat portion in the axial direction, is laminated by shifting the core plate by a certain rotation angle in the circumferential direction so that no cogging phenomenon occurs during operation. And the slot formed in the center part of each core board is set to the shape (skew shape) twisted along the axial direction of the stator core. When the aspect in which the slot is skewed in this manner and the aspect in which the above-described planar area is formed in parallel to the axial direction are combined, the slot is formed in the planar area, whereas the slot is in the skew shape. Since the refrigerant flow path is parallel to the axial direction, the cogging torque is increased by the refrigerant flow path, and there is a problem in that smooth rotation operation is hindered.

  On the other hand, after laminating a disk-shaped core plate that does not have a flat portion in the axial direction, it is also conceivable to form a planar region that is inclined by a predetermined angle with respect to the axial direction by machining (cutting). However, such a mode not only requires advanced machining techniques, but also causes problems such as scraps generated by machining clogging in circumferentially extending grooves formed on the outer surface of the stator core.

  The present invention has been made paying attention to such a problem, and the main object is that machining in a state in which a large number of core plates are laminated is unnecessary, and the saturation of magnetic flux is suppressed or prevented. It is another object of the present invention to provide a stator core that can rotate and a generator including such a stator core.

  That is, the stator core of the present invention is a stator core disposed in a cylindrical casing in a generator, and has a substantially disk shape and a first core plate formed with flat portions on the outer peripheral portions facing each other across the center, And a disk-shaped second core plate having the same or substantially the same diameter as the shortest distance connecting the flat portions through the center of the first core plate. In the stator core of the present invention, a plurality of first core plates and a plurality of second core plates are alternately arranged along the axial direction of the casing, and the first core plates are arranged in the axial direction. The flat portion forms a flow path forming region for forming a refrigerant flow path between the inner peripheral surface of the casing and at least the second core plate adjacent to the second core plate in the axial direction of the casing. The flow path forming region is inclined by a predetermined angle with respect to the axial direction of the casing by shifting the bundle of one core plate in the axial direction while shifting the bundle of one core plate by a certain rotation angle.

  Here, the “flat portion” is a concept including not only a straight and flat portion but also a curved portion or a slightly curved portion. In addition, “shifting at least a bundle of first core plates adjacent to each other across the bundle of second core plates in the axial direction of the casing in the circumferential direction by a certain rotation angle” means “in a bundle unit of the first core plates. Each first core plate is shifted by a certain rotation angle in the circumferential direction, and the bundle of adjacent first core plates is shifted by a certain rotation angle in the circumferential direction across the bundle of second core plates in the axial direction of the casing. And the first core plates adjacent to each other with the first core plates in the bundle unit of the first core plates having the same rotation angle in the circumferential direction with the second core plate bundle sandwiched in the axial direction of the casing. This is a concept including both of these modes, in which the bundle is shifted by a certain rotation angle in the circumferential direction.

  If it is such, each flat part of the 1st core board arranged along the axial direction of a stator core will face a different direction at least by the bundle unit of the 1st core board, and a narrow part of a magnetic path It does not continue to the same location along the axial direction of the stator core, so that the magnetic flux is not easily saturated and iron loss can be reduced.

  Furthermore, the stator core according to the present invention is formed by laminating a core plate having a slot at the center portion in the axial direction with a constant angular phase shifted in the circumferential direction, so that both the continuous slot and the planar region along the axial direction are twisted. (Skew shape), if only the slot is twisted and the plane area is parallel to the axial direction of the casing, the cogging torque that increases can be reduced, and a smooth rotation operation can be secured. .

  In addition, the stator core of the present invention does not require machining after laminating a large number of core plates when the flow path forming region is inclined at a predetermined angle with respect to the axial direction. There is no risk of clogging a groove formed by the bundle of the second core plates existing between the bundles of the first core plates adjacent to each other, and deformation or damage of the outer shape of the stator core after the core plates are laminated. It can be avoided.

  Furthermore, in the stator core according to the present invention, the sealing portion that closes the refrigerant flow path is arranged at a position adjacent to the bundle of the first core plates arranged closest to the axial end of the casing, so that the refrigerant is It is possible to prevent or suppress the flow out of the refrigerant flow path.

  In particular, the stator core of the present invention may further include a third core plate having a diameter that is the same as or substantially the same as the diameter of the first core plate, and the sealing portion may be configured by one or a plurality of third core plates. Therefore, the sealing part can be realized with a simple configuration.

  Moreover, the generator of this invention is equipped with the cylindrical casing and the stator core which has the structure mentioned above. If it is such, it will become a generator which can aim at the reduction of an iron loss which avoids the various effect mentioned above, ie, saturation of magnetic flux.

  According to the present invention, there is no need for machining in a state in which a large number of core plates are laminated, and the stator core capable of suppressing or preventing the saturation of magnetic flux and performing a smooth rotational operation, and a generator including such a stator core are provided. Can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The generator 1 according to the present embodiment can be applied as a dynamo device (dynamometer) imitating an engine which is one of automobile test apparatuses, for example, and as shown in FIG. And a stator core 3 disposed in the casing 2, and has a feature in a structure in which a refrigerant is circulated between the casing 2 and the stator core 3.

  As shown in FIGS. 9 and 10 (FIGS. 9 and 10 are schematic views of the end surface along the line aa and the end of the line bb in FIG. 3), the casing 2 is positioned facing the shaft core. Further, a supply port 21 for supplying the refrigerant and a discharge port 22 for discharging the refrigerant are provided. In this embodiment, oil is used as the refrigerant. The supply port 21 and the discharge port 22 each penetrate in the thickness direction of the casing 2. 9 and 10 illustrate an embodiment in which one supply port 21 and one discharge port 22 are provided, but a plurality of supply ports 21 and discharge ports 22 may be provided at predetermined intervals in the circumferential direction. . The supply port 21 and the discharge port 22 are not provided continuously over the entire area along the axial direction of the casing 2, but are, for example, cylindrical openings provided at a predetermined pitch along the axial direction of the casing 2. .

  As shown in FIG. 2 and FIG. 5, the stator core 3 has a substantially disk shape, a first core plate 31 having a flat portion 31 a at a portion facing the center, and a diameter smaller than that of the first core plate 31. A second core plate 32 having a disk shape is provided. A bundle of a plurality of first core plates 31 and a bundle of a plurality of second core plates 32 are alternately stacked along the axial direction of the casing 2.

  As shown in FIG. 6, the first core plate 31 is a so-called silicon steel plate in which a plurality of slots 31 s are formed radially at the center, and a pair of flattened outer peripheral portions facing the inner peripheral surface of the casing 2. It has the part 31a. That is, the 1st core board 31 has a pair of flat part 31a which opposes the outer edge part, and a pair of circular arc part 31b which connects the edge parts of the flat part 31a. The distance connecting the arc portions 31 b through the center, in other words, the diameter 31 x of the arc portion 31 b is set slightly smaller than the inner diameter of the casing 2. Such a first core plate 31 is produced in advance, for example, by a process of mechanically punching a silicon steel plate having a predetermined thickness.

  As shown in FIG. 7, the second core plate 32 has a disk-like shape called a so-called silicon steel plate having a slot 32 s having the same shape as the first core plate 31 at the center. The diameter 32x of the second core plate 32 is set to be the same or substantially the same as the shortest distance 31y that connects the flat portions 31a through the center of the first core plate 31. The second core plate 32 is also prepared in advance in the same manner as the first core plate 31.

  A bundle 31T of first core plates 31 in which a plurality of such first core plates 31 are stacked and a bundle 32T of second core plates 32 in which a plurality of second core plates 32 are stacked are alternately aligned with each other at the center. The stator core 3 laminated on the outer surface facing the inner peripheral surface of the casing 2 has a pair of flat regions 3A formed by the flat portions 31a of the first core plates 31 and arcs of the first core plates 31. It has a pair of curved surface area | region 3B formed of the part 31b. 2 to 5, the bundle 31T of the first core plates 31 arranged at a position where the stator core 3 can be divided into three in the axial direction is first than the bundle 31T of the other first core plates 31. The number of core plates 31 is increased.

  In the present embodiment, the adjacent first core plates 31, and hence the adjacent first core plate 31 bundles 31 </ b> T via the bundle 32 </ b> T of the second core plates 32, are angled at a constant rate in the circumferential direction of the stator core 3. By laminating while sequentially changing the phase, each substantially flat planar region 3A has a shape (skew shape) inclined by a predetermined angle with respect to the axial direction of the stator core 3. In the stator core 3 of the present embodiment, in the bundle 31T unit of the first core plates 31, the first core plates 31 that are adjacent in the axial direction are stacked with the angular phase being sequentially changed at a constant rate in the circumferential direction of the stator core 3. The bundles 31T of the first core plates 31 that are adjacent to each other with the bundle 32T of the second core plates 32 interposed therebetween are further laminated in the circumferential direction of the stator core 3 while sequentially changing the angular phase.

  In a state in which such a stator core 3 is disposed in the casing 2, each planar region 3A forms a partial circular space in cross-section in view of the inner peripheral surface of the opposing casing 2, and each space receives a refrigerant. It functions as a refrigerant flow path (first refrigerant flow path 4A, second refrigerant flow path 4B) for allowing the casing 2 to flow in the axial direction. That is, the flat area 3 </ b> A corresponds to the “flow path forming area” of the present invention in which the refrigerant flow paths 4 </ b> A, 4 </ b> B are formed between the inner peripheral surface of the casing 2. Each refrigerant channel (the first refrigerant channel 4A and the second refrigerant channel 4B) can communicate with the supply port 21 and the discharge port 22 formed in the casing 2, respectively. In the following description, the refrigerant channel that can communicate with the supply port 21 is referred to as a first refrigerant channel 4A, and the refrigerant channel that can communicate with the discharge port 22 is referred to as a second refrigerant channel 4B.

  Each curved surface region 3B in the stator core 3 also has a shape inclined at a predetermined angle with respect to the axial direction of the stator core 3 in the same manner as the planar region 3A. In a state where the stator core 3 is disposed in the casing 2, each curved surface region 3 </ b> B is slightly separated from the inner peripheral surface of the facing casing 2. That is, the outer surface of the stator core 3 has a twisted shape (skew shape) as a whole. In the present embodiment, when a large number of core plates 31 and 32 are stacked, the first core is connected to a casing-side key engagement portion (not shown) provided on the inner peripheral surface of the casing 2 so as to be inclined at a predetermined angle with respect to the axial direction. By sequentially engaging the stator core side key engaging portions 31k (see FIG. 4) provided on the outer peripheral surface of the plate 31, the outer surface of the stator core 3 is formed in an appropriate twisted shape. In addition, the core plates 31 and 32 adjacent to each other in the axial direction of the stator core 3 are joined to each other by an adhesive so as not to be separated from each other.

  Further, the stator core 3 according to the present embodiment forms a groove 3M extending in the circumferential direction by a bundle 32T of second core plates 32 arranged between the bundles 31T of adjacent first core plates 31 in each curved surface region 3B. is doing. The grooves 3M formed at the same pitch or substantially the same pitch along the axial direction of the stator core 3 are formed at the boundary between the curved surface region 3B and the planar region 3A or in the vicinity of the boundary. 2 refrigerant flow paths 4B) and functions as a refrigerant sub-flow path 5 that allows refrigerant to flow between the refrigerant flow paths (first refrigerant flow path 4A, second refrigerant flow path 4B).

  The stator core 3 has a generally cylindrical shape as a whole, and a rotor 7 is provided on the inner peripheral surface. 9 and 10, the rotor 7 is indicated by an imaginary line.

  Further, in the stator core 3 of the present embodiment, third core plates 33 that function as sealing portions 3 </ b> C that prevent or suppress the outflow of the refrigerant are disposed at both axial ends of the casing 2. As shown in FIG. 8, the third core plate 33 has a diameter 33 x that is the same as the diameter 31 x of the first core plate 31 or slightly larger than the diameter 31 x of the first core plate 31. In the present embodiment, as the third core plate 33, a plate having a substantially disk shape and having only one flat portion 33a having the same shape as the first core plate 31 is applied to the outer peripheral portion. Normally, the sealing portion 3C is configured by a bundle 33T of a plurality of third core plates 33, but the sealing portion 3C may be configured by only a single third core plate 33. Such a third core plate 33 is also produced in advance in the same manner as the first core plate 31 and the second core plate 32.

  Next, operation | movement and an effect | action of the generator 1 which has such a structure are demonstrated along the flow of a refrigerant | coolant.

  First, the refrigerant flows from a refrigerant supply device (not shown) via the supply port 21 of the casing 2 into the first refrigerant channel 4A communicating with the supply port 21 to fill the first refrigerant channel 4A. In addition, by sealing both ends of the first refrigerant flow path 4A with the sealing portion 3C, the refrigerant is prevented or suppressed from flowing out from both the end parts of the first refrigerant flow path 4A. The refrigerant filling the first refrigerant flow path 4A flows into each refrigerant sub-flow path 5 formed in the curved surface region 3B of the stator core 3, and flows along the circumferential direction of the stator core 3 toward the second refrigerant flow path 4B. In the present embodiment, the height of each refrigerant sub-channel 5, in other words, the difference in height between the outer peripheral portion (arc portion 31 b) of the first core plate 31 and the outer peripheral portion of the second core plate 32 in a circular region. Is set to several mm, and the width of each refrigerant sub-flow channel 5, in other words, the thickness dimension of the bundle 32T of the second core plate 32 is changed from a quarter of the height of the refrigerant sub-channel 5 to 5 minutes. The dimension corresponding to 1 is set. Since a large number of such refrigerant sub-channels 5 are provided along the axial direction of the stator core 3, the contact area of the refrigerant with the outer surface of the stator core 3 is large, and the cooling effect by the refrigerant can be enhanced.

  The refrigerant flowing through each refrigerant sub-channel 5 reaches the second refrigerant channel 4 </ b> B and is finally discharged from the discharge port 22 of the casing 2.

  By the way, the shortest distance 31y from the center to the flat portion 31a in each first core plate 31 is naturally shorter than the distance from the center to the arc portion 31b, and accordingly, the path of magnetic flux (magnetic path) is also narrowed. However, since the stator core 3 according to the present embodiment has the first core plates 31 adjacent in the axial direction of the casing 2 shifted in the circumferential direction by a predetermined angle and arranged in the axial direction, the flat portions 31a have different directions. It will turn. Therefore, the narrow part of the magnetic path does not continue to the same place along the axial direction of the stator core 3, the magnetic flux is hardly saturated, and iron loss can be reduced. Further, in the stator core 3 according to the present embodiment, the flat area 3A, which is a flow path forming area capable of forming the refrigerant flow paths 4A, 4B, with the inner peripheral surface of the casing 2 is inclined at a predetermined angle with respect to the axial direction. ing. As a result, the refrigerant flow paths 4A and 4B together with the slots 31s and 32s continuous along the axial direction also have a skew shape inclined at a predetermined angle with respect to the axial direction, and only the slot has a skew shape and the refrigerant flow path is If the mode is parallel to the axial direction, the increased cogging torque can be effectively reduced, and a smooth rotation operation can be ensured.

  In addition, when the planar region 3A of the stator core 3 is inclined at a predetermined angle with respect to the axial direction, the stator core 3 according to the present embodiment has a large number of core plates (first core plate 31 and second core prepared in advance). Since the plate 32 and the third core plate 33) are laminated, the machine is formed after laminating a large number of core plates (first core plate 31, second core plate 32, third core plate 33). There is no need for processing, and there is no fear that clogs generated by machining are clogged in the groove 3M (refrigerant sub-channel 5), and the shape of the outer surface of the stator core 3 after a large number of core plates 31 and 32 are stacked. Deformation and damage can be avoided.

  Further, in the stator core 3 of the present embodiment, a sealing portion 3 </ b> C that closes the refrigerant flow path is disposed at a position adjacent to the bundle of the first core plates 31 that is disposed closest to the axial end portion of the casing 2. The refrigerant is prevented or suppressed from flowing out of the refrigerant flow path.

  In particular, the stator core of the present invention includes a third core plate having a diameter that is the same as or substantially the same as the diameter of the first core plate, and the sealing portion 3C is configured by a plurality of third core plates. The stop portion 3C can be realized with a simple configuration.

  In addition, this invention is not limited to embodiment mentioned above. For example, the flat portion formed on the first core plate is preferably a flat straight portion, but may be a portion curved or slightly curved toward the center of the first core plate. Thus, if the “flat portion” of the first core plate is a curved or slightly curved portion, the refrigerant formation formed by the “curved or slightly curved flat portion” of the first core plates arranged in the axial direction of the casing. The region is a recessed region (groove region) that is recessed toward the center side of the stator core.

  Further, the inclination angle (skew angle) of the planar region with respect to the axial direction of the stator core may be appropriately changed according to the application or specification of the generator or the stator core, and the flow passage areas of the refrigerant flow passage and the refrigerant sub flow passage are also What is necessary is just to adjust by changing suitably the shape of a 1st core board or a 2nd core board.

  Further, the first core plates in the bundle unit of the first core plates are arranged in the axial direction at the same angle in the circumferential direction without being shifted by a constant rotation angle in the circumferential direction, and adjacent to each other with the bundle of the second core plates interposed therebetween. A mode in which the flow path forming region is inclined at a predetermined angle with respect to the axial direction of the casing by shifting the bundles of the matching first core plates in the axial direction by shifting the bundles of the first core plates by a certain rotation angle in the circumferential direction.

  As an aspect for connecting a plurality of core plates, welding, caulking, or the like may be applied.

  Further, grooves extending in the circumferential direction or the axial direction may be formed on the inner peripheral surface of the casing, and these grooves may function as a refrigerant flow path.

  You may comprise the sealing part in a stator core with the 3rd core board of 1 sheet which has the same diameter as the diameter of a 1st core board, or substantially the same.

  In addition, one or both of the first core plates and the second core plates in the bundle unit of the first core plates may be stacked while being shifted by a non-constant rotation angle. For example, depending on the position of the slot of each core plate (the portion corresponding to the slots 31 s and 32 s in the above-described embodiment), one or both of the first core plate and the second core plate are shifted and stacked. It doesn't matter. In this case, even when the position of each slot is shifted by an error in machining accuracy, one or both of the first core plate and the second core plate are shifted and laminated while giving priority to positioning of the slots. Therefore, the stator core can be cooled without impairing the capacity of the generator.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 is an overall perspective view of a generator according to an embodiment of the present invention. The whole perspective view of the stator core which concerns on the same embodiment. The X direction arrow directional view in FIG. The Y direction arrow directional view in FIG. FIG. 3 is a view in the direction of the arrow Z in FIG. 2. The whole first core board in the embodiment. The whole figure of the 2nd core board in the embodiment. The whole third core board figure in the embodiment. The figure which shows typically the aa line end surface in FIG. 2 of the generator which concerns on the same embodiment. The figure which shows typically the bb line | wire end surface in FIG. 2 of the generator which concerns on the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Generator 2 ... Casing 3 ... Stator core 31 ... 1st core board 31a ... Flat part 31T ... Bundle of 1st core board 32 ... 2nd core board 32T ... Bundle of 2nd core board 33 ... 3rd core board 3A ... Channel formation area (planar area)
3C: Sealing portion 3M: Groove 4A, 4B ... Refrigerant flow path (first refrigerant flow path, second refrigerant flow path)
5 ... Refrigerant sub flow path

Claims (4)

A stator core disposed in a cylindrical casing in a generator,
A first core plate having a substantially disk shape and having flat portions formed on the outer peripheral portions facing each other across the center;
A disk-shaped second core plate set to the same or substantially the same diameter as the shortest distance connecting the flat portions through the center of the first core plate,
A plurality of bundles of the first core plates and a bundle of the plurality of second core plates are alternately arranged along the axial direction of the casing, and by the flat portions of the first core plates arranged in the axial direction, Forming a flow path forming region for forming a refrigerant flow path between the casing and the inner peripheral surface;
By arranging at least a bundle of the first core plates adjacent to each other across the bundle of the second core plates in the axial direction of the casing in the circumferential direction and arranging them in the axial direction by shifting them by a certain rotation angle. The stator core is inclined at a predetermined angle with respect to the axial direction of the casing. The stator core according to claim 1, wherein a sealing portion that closes the refrigerant flow path is disposed at a position adjacent to a bundle of first core plates that are disposed closest to the axial end portion of the casing. The third core plate having a diameter that is the same as or substantially the same as the diameter of the first core plate is provided, and the sealing portion is constituted by one or a plurality of the third core plates. The stator core described in 1. A cylindrical casing;
A generator comprising the stator core according to any one of claims 1 to 3 disposed in a casing.

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