JP7068037B2 - Stator core support device and rotary electric machine - Google Patents

Description

Embodiments of the present invention relate to a stator core support device and a rotary electric machine.

A rotating electric machine such as a generator or an electric motor includes a rotor having a rotating shaft and a stator. The rotary electric machine is roughly divided into an inner rotor type and an outer rotor type. Of these, in the inner rotor type rotary electric machine, the stator has a cylindrical stator core formed so as to surround the rotor and a stator core in the radial direction. Some have a stator frame that covers from the outside and is supported by the foundation. In such a rotary electric machine, the stator may vibrate due to the magnetic attraction generated by the rotation of the rotor, but it is not desirable that the vibration propagates from the rotary electric machine to the foundation. Therefore, in such a stator of a rotary electric machine, a stator core support device including an elastic body such as a spring plate or a spring rod is arranged between the stator core and the stator frame, and the support device is provided. The stator core may be supported by the stator frame via the stator frame. According to this, it is possible to suppress the vibration from propagating to the outside of the stator.

FIG. 8 is a schematic cross-sectional view showing an example of a rotary electric machine provided with a general stator core support device for elastically supporting a stator core, cut along the axial direction. The axial direction means the direction along the rotation center axis of the rotor. In the example of FIG. 8, the stator frame 11 of the stator 10 has a cylindrical outer peripheral plate 12, and the stator core 20 has a stator via a stator core support device (hereinafter, abbreviated as a support device) 300. It is supported by the frame 11, especially the outer peripheral plate 12. The stator core 20 is formed by laminating a plurality of annular laminated cores 21 to form a cylindrical shape, and the rotor inside the stator core 20 in the radial direction is shown by a two-dot chain line for convenience of illustration. 40 is rotatably arranged. Dovetail-shaped grooves are formed on the outer peripheral portion of each laminated iron core 21, and a plurality of these grooves are formed at intervals in the circumferential direction.

The support device 300 is a support device called a "spring bar type". The support device 300 includes a plurality of axial ribs 31 that hold a plurality of laminated iron cores 21 by fitting dovetail-shaped grooves of each laminated iron core 21, and a plurality of laminated layers that are held by the ribs 31 to form a cylindrical shape. A pair of iron core holding plates 32 that fasten and hold the iron core 21 from both sides in the axial direction, a plurality of annular iron core holding rings 33 that surround and hold the rib 31 from the radial outside, and a rib 31 that surrounds the rib 31 from the radial outside. A plurality of annular core support plates 34 that are held and project radially outward from the iron core holding ring 33, and fixed to the inner peripheral surface of the outer peripheral plate 12 so as to be positioned coaxially with the outer peripheral plate 12 of the stator frame 11. It has a plurality of annular diaphragms 35 located on the radial outer side of the stator core 20 and a plurality of spring rods 36 extending axially to connect the core support plate 34 and the diaphragm 35. ing. In a large rotary electric machine, since the shape of the stator core is large, it is difficult to form an annular laminated core with one sheet, and the laminated core may be divided in the circumferential direction. In the example shown in FIG. 8, the laminated iron core 21 is divided in the circumferential direction to form a plurality of fan-shaped divided bodies. The divided bodies adjacent to each other in the axial direction are laminated in a state where the half-widths of the fan-shaped internal angles are offset from each other.

In such a support device 300, in a state where the stator core 20 is arranged so that the central axis of the stator core 20 coincides with the central axis of the stator frame 11, a plurality of spring rods 36 arranged in the circumferential direction are fixed. The iron core support plate 34 is connected to the separator plate 35 fixed to the outer peripheral plate 12 of the child frame 11. At this time, the spring rod 36 extends beyond the stator core 20 on both sides in the axial direction, and the separator plate 35 and the iron core support plate 34 are alternately arranged in the axial direction. Therefore, the spring rod 36 is held by the adjacent separating plates 35 in a state of being held on both sides, and is connected to the iron core support plate 34 between the separating plates 35. As a result, the spring rod 36 bends with respect to the radial displacement of the iron core support plate 34, and the stator core 20 can be elastically supported.

Further, FIG. 9 is a schematic cross-sectional view showing a rotary electric machine provided with a general stator core support device different from the type shown in FIG. 8 cut along the axial direction. The same components as those of the support device 300 of the type shown in FIG. 8 are designated by the same reference numerals. The support device 300'shown in FIG. 9 is a support device called a "spring plate type". The support device 300'has a plurality of axial ribs 31 in which a dovetail-shaped groove of each laminated iron core 21 is fitted to hold a plurality of laminated iron cores 21, and a plurality of cylindrical ribs 31 held by the ribs 31. A pair of iron core holding plates 32 that fasten and sandwich the laminated iron core 21 from both sides in the axial direction, a plurality of annular iron core holding rings 33 that surround and hold the rib 31 from the outside in the radial direction, and an outer peripheral plate 12 of the stator frame 11. A plurality of separator plates 35 fixed to the inner peripheral surface of the stator by welding or the like and located on the radial outer side of the stator core 20, and a plurality of separator plates 35 arranged so as to extend in the axial direction to connect the rib 31 and the separator plate 35. It has a spring plate 38 and. The configuration of the diaphragm 35 is partially different from that shown in FIG. The partition plate 35 in the support device 300'is provided at the annular base portion 35A fixed to the inner peripheral surface of the outer peripheral plate 12 so as to be coaxial with the outer peripheral plate 12 and at the inner peripheral end of the base portion 35A. It has a cylindrical connecting portion 35B, and the connecting portion 35B is used for connecting to the spring plate 38.

FIG. 10 is a perspective view of the stator core 20 and the support device 300', particularly the rib 31 and the spring plate 38 of the support device 300'. With reference to FIGS. 9 and 10, in this support device 300', a plurality of stator cores 20 are arranged in the circumferential direction so that the central axis of the stator core 20 coincides with the central axis of the stator frame 11. The arranged spring plate 38 connects the rib 31 to the separator plate 35 fixed to the outer peripheral plate 12 of the stator frame 11. Specifically, a plurality of partition plates 35 are provided at intervals in the axial direction, and both ends of the spring plate 38 are connected to the connecting portions 35B of the separator plates 35 adjacent to each other in the axial direction. On the other hand, the portion of the spring plate 38 between the adjacent separators 35 is connected to the rib 31. The portion of the spring plate 38 between the adjacent separators 35 and the rib 31 are connected by bolts. As a result, the spring plate 38 bends with respect to the radial displacement of the stator core 20, and the stator core 20 can be elastically supported.

Japanese Patent No. 3456824 Japanese Unexamined Patent Publication No. 2011-250626

FIG. 11 is a perspective view of the stator core 20 and the support device 300 from a bird's-eye view. In the rotary electric machine provided with the support device 300 described above, the main magnetic flux generated from the field of the rotor 40 passes through the inside of the stator core 20 as shown in the direction of the arrow (white) in FIG. At this time, a part of this main magnetic flux leaks as a leaking magnetic flux Φ to the back surface (outer peripheral surface) of the stator core 20, and a closed circuit-like portion formed by a member constituting the support device 300 of the stator core 20. Can be interlocked with. Specifically, as shown in FIG. 11, in the support device 300, a member such as a rib 31 extending in the axial direction and a member such as an iron core holding ring 33 and an iron core holding plate 32 extending in the circumferential direction are combined in a grid pattern. The stator core 20 is supported by the stator frame 11. By combining the members in a grid pattern in this way, for example, the closed circuit-shaped portion (the portion surrounded by the region of the alternate long and short dash line indicated by the reference numeral CC1 in FIG. 11) is formed by the two ribs 31 and the two iron core holding rings 33. It is formed, and the leakage magnetic flux Φ can be interlinked with this. Further, a closed circuit-like portion (a portion surrounded by the region of the alternate long and short dash line shown by the reference numeral CC2 in FIG. 11) is formed by the two ribs 31, the iron core holding plate 32, and the iron core holding ring 33, and the leakage magnetic flux Φ is chained thereto. Can be crossed. Also in the support device 300', a closed circuit-shaped portion is formed by the two ribs 31 and the two iron core holding rings 33, and the closed circuit-shaped portion is formed by the two ribs 31, the iron core holding plate 32, and the iron core holding ring 33. Is formed, and the leakage magnetic flux Φ can be interlinked with these closed circuit-like portions.

Further, FIG. 12 is a schematic view of the connecting portion 35B of the rib 31, the spring plate 38 and the partition plate 35 of the support device 300'of the "spring plate type" when the rotary electric machine is viewed from the outside in the radial direction. As shown in FIGS. 10 and 12, in the support device 300', different spring plates 38 are connected to each rib 31 from one side and the other side in the circumferential direction. In this case, as shown by the arrows in FIG. 12, the ribs 31 adjacent to each other in the circumferential direction, the spring plates 38 adjacent to each other in the circumferential direction between the ribs 31, and the spring plates 38 adjacent to each other in the circumferential direction are connected to each other. The connecting portion 35B of the separating plate 35 and the iron core holding plate 32 may form a closed circuit-like portion (a portion surrounded by the region of the two-dot chain line indicated by the reference numeral CC3 in FIG. 12). In the spring plate type support device 300', the leakage magnetic flux Φ may be interlinked with, for example, the closed circuit-shaped portion CC3.

Here, since the support devices 300 and 300'require mechanical strength, each component thereof is generally made of metal, particularly iron. Therefore, the closed circuit-shaped portion is shown by an arrow (painted in black) in FIG. And as shown by the arrow in FIG. 12, as a result of the action of the magnetic flux in the direction of canceling the leaking magnetic flux Φ, an eddy current may flow in the direction of the arrow and an eddy current loss may occur. Such eddy current loss reduces the efficiency of the rotary electric machine. Further, when such an eddy current is generated, the temperature of the support devices 300, 300'rises, and the tightening force of the fastening portion decreases due to the thermal elongation of the members constituting the support devices 300, 300', and the stator There may also be a problem that the vibration of the iron core 20 increases.

Recently, it has been desired for generators to achieve both an increase in magnetic flux and miniaturization in order to increase the power generation output, but if the physique of the rotating electric machine is made smaller while increasing the magnetic flux, there will be more leakage of magnetic flux. It becomes a tendency to become. At this time, if the stator core is thinned, the leakage of magnetic flux may become significantly large. Therefore, in order to achieve both an increase in the magnetic flux from the rotor and a miniaturization, measures for sufficiently suppressing the leakage of the magnetic flux are required.

The present invention has been made in view of the above circumstances, and suppresses the eddy current loss and temperature rise that may occur due to the magnetic flux leaking from the stator core, and suppresses the decrease in operating efficiency of the rotary electric machine and the generation of vibration. It is an object of the present invention to provide a stator core support device and a rotary electric machine that can be used.

The stator core support device according to the embodiment includes a plurality of types of support members for supporting the stator core to a stator frame arranged radially outside the stator core, and the plurality of types of support members. Are combined so as to form a closed circuit-shaped portion, and an insulating portion for electrically insulating a part of the closed circuit-shaped portion is provided.

The rotary electric machine according to the embodiment includes a stator and a rotor configured by supporting the stator core to a stator frame on the radial side thereof by the stator core support device described above.

According to the present invention, it is possible to suppress the eddy current loss and the temperature rise that may occur due to the magnetic flux leaking from the stator core, and to suppress the decrease in the operating efficiency of the rotary electric machine and the occurrence of vibration.

It is the schematic sectional drawing of the rotary electric machine which concerns on 1st Embodiment. It is a detailed cross-sectional view of the main part of the stator core support device in the rotary electric machine shown in FIG. It is a detailed cross-sectional view of the main part of the stator core support device in the rotary electric machine shown in FIG. It is a figure which shows an example of the distribution of the magnetic flux density outside the radial direction of the stator core in the rotary electric machine shown in FIG. It is the schematic sectional drawing of the rotary electric machine which concerns on 2nd Embodiment. FIG. 4 is a view of the stator core and the stator core support device of the rotary electric machine shown in FIG. 4 as viewed from the outside in the radial direction. It is a perspective view of the main part of the stator core support device in the rotary electric machine shown in FIG. FIG. 3 is a cross-sectional view taken along the line VII-VII of FIG. It is schematic cross-sectional view of the rotary electric machine provided with the general stator core support device for elastically supporting a stator core. FIG. 3 is a schematic cross-sectional view of a rotary electric machine provided with a general stator core support device of a type different from the stator core support device shown in FIG. FIG. 9 is a perspective view of the stator core and the stator core support device of the rotary electric machine shown in FIG. 9 from a bird's-eye view. FIG. 8 is a perspective view of the stator core and the stator core support device of the rotary electric machine shown in FIG. 8 from a bird's-eye view. It is the schematic of the rib, the spring plate and the partition plate of the stator core support device shown in FIG. 9 when the rotary electric machine is seen from the outside in the radial direction.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Of the components in each embodiment described below, the same components as those of the rotary electric machine shown in FIGS. 8 to 12 are designated by the same reference numerals, and the description of the common parts is omitted. There is.

(First Embodiment)
FIG. 1 is a schematic cross-sectional view showing the rotary electric machine 1 according to the first embodiment cut along the axial direction. The rotary electric machine 1 shown in FIG. 1 is a rotary field type rotary electric machine, and includes a stator 10 and a rotor 40 that rotates about a rotation center axis C1 inside the stator 10 in the radial direction. The rotor 40 is provided with a field coil (not shown). In the present embodiment, the axial direction means the direction along the rotation center axis C1, and the radial direction means the direction orthogonal to the rotation center axis C1. Further, the direction of rotation about the rotation center axis C1 is called a circumferential direction. Further, in FIG. 1, for convenience of explanation, hatching of each component of the rotary electric machine 1 is omitted, and the rotor 40 is shown by a two-dot chain line.

The stator 10 has a cylindrical stator core 20 formed so as to surround the rotor 40, and a cylindrical outer peripheral plate 12 that covers the stator core 20 from the radial outside, and a stator supported by a foundation. A frame 11 and a stator core support device (hereinafter, abbreviated as a support device) 30 for supporting the stator core 20 on the stator frame 11 are provided.

The stator core 20 is formed by laminating a plurality of annular laminated cores 21 to form a cylindrical shape, and a dovetail-shaped groove is formed on the outer peripheral portion of each laminated core 21, and the grooves are spaced apart in the circumferential direction. Multiple are formed. The laminated iron core 21 is formed by punching, and the surface is insulated after the formation. Therefore, insulation is ensured between the laminated iron cores 21 adjacent to each other after laminating.

The support device 30 is a support device called a "spring bar type". The support device 30 is a stator core including a plurality of laminated iron cores 21 by fitting a dovetail-shaped groove of each laminated iron core 21 as a support member to be combined so as to form a closed circuit-shaped portion, which will be described in detail later. A plurality of axial ribs 31 holding the 20 and a plurality of laminated iron cores 21 held by the ribs 31 in a cylindrical shape are fastened and sandwiched along the axial direction from both sides in the axial direction, in other words, from both ends of the rib 31. A pair of iron core holding plates 32, a plurality of annular iron core holding rings 33 that surround and hold the rib 31 from the radial outside, and a rib 31 that surrounds and holds the rib 31 from the radial outside, and have a diameter larger than that of the iron core holding ring 33. A plurality of annular core support plates 34 projecting outward in the direction and fixed to the inner peripheral surface of the outer peripheral plate 12 so as to be coaxial with the outer peripheral plate 12 of the stator frame 11 by welding or the like, the diameter of the stator core 20 It has a plurality of annular diaphragms 35 located on the outer side of the direction, and a spring rod 36 extending in the axial direction to connect the iron core support plate 34 and the diaphragm 35.

In the present embodiment, a plurality of ribs 31 are arranged on the inner peripheral surface of the iron core support plate 34 at intervals in the circumferential direction and are fixed by bolting or the like. The rib 31 is pressed by the iron core pressing ring 33. The iron core holding ring 33 is tightened in the circumferential direction by a mechanism (not shown), and as a result, the rib 31 is held down. Further, a plurality of spring rods 36 are arranged in the circumferential direction, and the iron core support plate 34 is connected to the separator plate 35. At this time, the spring rod 36 extends beyond the stator core 20 on both sides in the axial direction, and the separator plate 35 and the iron core support plate 34 are alternately arranged in the axial direction. Therefore, the spring rod 36 is held by the adjacent separating plates 35 in a state of being held on both sides, and is connected to the iron core support plate 34 between the adjacent separating plates 35. As a result, the spring rod 36 bends with respect to the radial displacement of the iron core support plate 34, and the stator core 20 is elastically supported by the stator frame 11.

Similar to the support device 300 shown in FIG. 8, the support device 30 according to the present embodiment includes a member (axial member) such as a rib 31 extending in the axial direction and a spring bar 36, and an iron core holding plate 32 extending in the circumferential direction. The stator core 20 is supported by the stator frame 11 by combining members (circumferential members) such as the iron core holding ring 33, the iron core support plate 34, and the separator plate 35 in a grid pattern. Therefore, a closed circuit-like portion through which an eddy current due to the magnetic flux generated from the rotor 40 can flow is formed. Specifically, in the support device 30, although not shown, the closed circuit-shaped portion CC1 formed by the two ribs 31 and the two iron core holding rings 33 and the two, as in the example shown in FIG. A closed circuit-shaped portion CC2 formed by the rib 31, the iron core holding plate 32, and the iron core holding ring 33 is formed. On the other hand, in the present embodiment, the rib 31 and the iron core holding plate 32 are electrically insulated, and the rib 31 and the iron core holding ring 33 are electrically insulated. FIG. 2A is a detailed cross-sectional view of a connecting portion between the rib 31 and the iron core holding plate 32, and FIG. 2B is a detailed cross-sectional view of the connecting portion between the rib 31 and the iron core holding ring 33.

The rib 31 extends so as to extend beyond the stator core 20 on both sides in the axial direction, and the iron core holding plate 32 is adapted to penetrate the rib 31 in the axial direction. In the example shown in FIG. 2A, a cylindrical insulating sleeve 32B is provided in the insertion hole 32A formed in the iron core holding plate 32 in the axial direction for passing the end portion of the rib 31. The end portion of the rib 31 is passed through the insulating sleeve 32B and protrudes from the insulating sleeve 32B, and the insulating nut 32C is screwed into the protruding portion. The insulating nut 32C is provided for tightening the stator core 20 via the iron core holding plate 32 by being squeezed toward the center side in the axial direction of the rib 31. A flange portion 32B1 is formed at the end of the insulating sleeve 32B on the insulating nut 32C side, and the flange portion 32B1 is located between the insulating nut 32C and the iron core holding plate 32. As a result, the rib 31 and the iron core holding plate 32 are electrically insulated from each other. That is, the rib 31 and the iron core holding plate 32 are electrically insulated by being in contact with each other via the insulating sleeve 32B as an insulating portion and the insulating nut 32C. The materials of the insulating sleeve 32B and the insulating nut 32C are not particularly limited as long as the insulating property can be ensured. For example, the insulating sleeve 32B may be made of an insulating resin material having heat resistance, and the insulating nut 32C may be made of a non-magnetic metal material and the surface may be varnished to provide insulating properties. You may secure it.

On the other hand, in the example shown in FIG. 2B, the insulating member 31A is arranged between the rib 31 and the iron core holding ring 33. The iron core holding ring 33 presses the rib 31 via the insulating member 31A, whereby the rib 31 and the iron core holding ring 33 are electrically insulated from each other. That is, the rib 31 and the iron core holding ring 33 are electrically insulated by being in contact with each other via the insulating member 31A as an insulating portion. The material of the insulating member 31A is not particularly limited as long as the insulating property can be ensured. Further, instead of the insulating member 31A, an insulating film may be formed on the rib 31 by varnishing.

Next, a case where the rotary electric machine 1 functions as a generator will be taken as an example, and the operation according to the present embodiment will be described. In this case, first, a current is supplied to the field coil of the rotor 40 so that the field coil of the rotor 40 functions as an electromagnet. In this state, the rotor 40 is rotated, whereby the magnetic flux from the field coil passes through the stator coil on the inner peripheral surface of the stator core 20, and power is generated. At this time, if the magnetic flux generated from the field coil leaks to the back surface of the stator core 20, that is, to the outside in the radial direction, the magnetic flux may pass through the closed circuit-shaped portion formed by the members constituting the support device 30. At this time, the eddy current tries to flow through the closed circuit-like portion.

Here, in the present embodiment, as described above, the rib 31 and the iron core holding plate 32 that can form the closed circuit-like portion are electrically insulated, and the rib 31 and the iron core holding ring 33 are electrically insulated. It is insulated. This suppresses the flow of eddy currents due to the leakage magnetic flux in the closed circuit-like portions that can be formed by these. That is, the rib 31 and the iron core holding plate 32 may form a closed circuit-shaped portion CC2 (see FIG. 11) together with the other adjacent ribs 31 and the iron core holding ring 33, but in this closed circuit-shaped portion CC2, the rib 31 and Since the iron core holding plate 32 is electrically insulated, the flow of eddy current is suppressed. Further, the rib 31 and the iron core holding ring 33 may form a closed circuit-shaped portion CC1 (see FIG. 11) together with other adjacent ribs 31 and the iron core holding ring 33. In this closed circuit-shaped portion CC1, the rib 31 and the iron core are formed. Since the holding ring 33 is electrically insulated, the flow of eddy current is suppressed. As a result, the eddy current loss can be suppressed, and the thermal elongation of the constituent members of the support device 30 due to the temperature rise of the support device 30 can be suppressed.

As described above, according to the present embodiment, it is possible to suppress the eddy current loss and the temperature rise that may occur due to the magnetic flux leaking from the stator core 20, and suppress the decrease in the operating efficiency of the rotary electric machine 1 and the generation of vibration. .. Further, in the present embodiment, since the surface of each laminated iron core 21 is insulated, no eddy current that short-circuits the laminated iron core 21 is generated. Further, although the partition plate 35 of the support device 30 and the stator frame 11 are not insulated, even if the stator frame 11 forms a circuit through which an eddy current can flow, the circuit is large and the impedance is high. Eddy currents are rarely a problem.

By the way, FIG. 3 shows an example of the distribution of the magnetic flux density on the radial outer side of the stator core 20 in the rotary electric machine 1. As shown in the figure, the magnetic flux leaking to the outside in the radial direction of the stator core 20 becomes large at the axial end portion of the stator core 20, and the magnetic flux density becomes high. On the other hand, on the axially central side of the stator core 20, the magnetic flux leaking to the radial outer side of the stator core 20 is small, and the magnetic flux density is low. Considering such characteristics, the member constituting the support device 30 can sufficiently suppress the adverse effect of the magnetic flux even if it is only partially insulated only in the region on the end side in the axial direction of the stator core 20. it is conceivable that. Therefore, for example, insulation may be ensured only between the rib 31 on the axial end side of the stator core 20 and the iron core holding ring 33. Further, the insulating property may be ensured only between the rib 31 and the iron core holding plate 32. In such a case, it is possible to economically suppress the eddy current loss and the temperature rise that may occur due to the magnetic flux leaking from the stator core 20.

In the present embodiment, the rib 31 and the iron core holding plate 32 are electrically insulated, and the rib 31 and the iron core holding ring 33 are electrically insulated, but the other members are insulated from each other. You may. For example, the spring rod 36 and the separator plate 35 may be electrically insulated, or the spring rod 36 and the iron core support plate 34 may be electrically insulated.

(Second embodiment)
Next, the second embodiment will be described. Of the constituent parts of the present embodiment, the same as the constituent parts of the rotary electric machine shown in FIGS. 8 to 12 and the constituent parts of the first embodiment are designated by the same reference numerals and are common parts. The explanation of may be omitted.

FIG. 4 is a schematic cross-sectional view showing the rotary electric machine 1'according to the second embodiment cut along the axial direction, and FIG. 5 shows the stator core 20 and the stator core of the rotary electric machine 1'. It is a figure which looked at the support device 30'(hereinafter, abbreviated as a support device 30') from the outside in the radial direction. In the present embodiment, the configuration of the stator core support device 30'is different from that of the first embodiment. In FIG. 4, as in FIG. 1, hatching of each component of the rotary electric machine 1'is omitted for convenience of explanation.

As shown in FIGS. 4 and 5, the support device 30'is a support device called a "spring plate type". The support device 30'holds a stator core 20 including a plurality of laminated iron cores 21 by fitting a dovetail-shaped groove of each laminated iron core 21 as a support member combined so as to form a closed circuit-shaped portion. A pair of axially-shaped ribs 31 and a plurality of laminated iron cores 21 held by the ribs 31 and having a cylindrical shape are fastened and sandwiched along the axial direction from both sides in the axial direction, in other words, from both ends of the ribs 31. The iron core holding plate 32, a plurality of annular iron core holding rings 33 that surround and hold the rib 31 from the outside in the radial direction, and a fixed core holding ring 33 fixed to the inner peripheral surface of the outer peripheral plate 12 of the stator frame 11 by welding or the like. It has a plurality of diaphragms 35 located on the outer side in the radial direction of 20, and a plurality of spring plates 38 arranged so as to extend in the axial direction and connecting the rib 31 and the diaphragm 35.

As shown in FIG. 5, a plurality of ribs 31 are arranged at intervals in the circumferential direction. The spring plate 38 is connected to the rib 31 in the circumferential direction, and is interposed between the rib 31 and the stator frame 11 in order to elastically support the stator core 20 to the stator frame 11. Two spring plates 38 are provided on one rib 31 at each of a plurality of mounting positions intermittently defined in the axial direction, and the two spring plates 38 sandwich the rib 31 from both sides in the circumferential direction at each mounting position. It is connected to the rib 31. In other words, different spring plates 38 are connected to each rib 31 from one side and the other side in the circumferential direction. Further, the spring plate 38 is radially outwardly separated from the outer peripheral surface of the stator core 20. The spring plate 38 is connected to the rib 31 at a portion between both ends in the axial direction, for example, a central portion, and both ends are connected to different separator plates 35. A plurality of partition plates 35 are arranged at intervals in the axial direction. The separator plate 35 has a base portion 35A fixed to the inner peripheral surface of the outer peripheral plate 12 so as to be coaxial with the outer peripheral plate 12, and a connecting portion 35B provided at the inner peripheral end of the base portion 35A. ing. The connecting portion 35B is shown by a two-dot chain line in FIG. 5 for convenience of explanation. Explaining with reference to FIG. 10, both ends of the spring plate 38 are connected to the connecting portions 35B of the separating plates 35 adjacent to each other in the axial direction. On the other hand, a portion of the spring plate 38 between adjacent separators 35, such as the central portion, is connected to the rib 31. The portion of the spring plate 38 between the adjacent separators 35 and the rib 31 are connected by bolts. As a result, the spring plate 38 bends with respect to the radial displacement of the stator core 20, and the stator core 20 can be elastically supported. Although the connecting portion 35B in the present embodiment is cylindrical, it may be configured as a curved portion provided so as to be aligned with the position of the spring plate 38.

FIG. 6 is a perspective view showing a connecting portion between the rib 31 and the spring plate 38, and FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 4 of the connecting portion between the separating plate 35 and the spring plate 38. be. In the present embodiment, the rib 31 and the spring plate 38 corresponding to two different types of axial members are electrically insulated, and the separator plate 35 corresponding to the circumferential member and the spring corresponding to the axial member are electrically insulated. It is electrically insulated from the plate 38.

Specifically, as shown in FIG. 6, the rib 31 and the spring plate 38 have an insulating plate member 51 arranged between them, and insulation from the spring plate 38 to the rib 31 via the insulating plate member 51. By fastening the sex bolt 52 to the rib 31, it is integrated and insulated from each other. That is, the rib 31 and the spring plate 38 are electrically insulated by being in contact with each other via the insulating plate member 51 as an insulating portion and the insulating bolt 52. As shown in FIG. 7, the spring plate 38 and the partition plate 35 have an insulating plate member 61 arranged between them, and have an insulating property extending from the spring plate 38 to the separator plate 35 via the insulating plate member 61. By fastening the bolts 62 to the diaphragm 35, they are integrated and insulated from each other. Further, an insulating washer 63 is provided between the spring plate 38 and the head of the insulating bolt 62. That is, the spring plate 38 and the separator plate 35 are electrically insulated by being in contact with each other via an insulating plate member 61 as an insulating portion, an insulating bolt 62, and an insulating washer 63.

The materials of the insulating plate members 51, 61, the insulating bolts 52, 62, and the insulating washer 63 are not particularly limited as long as the insulating property can be ensured. For example, the insulating plate members 51 and 61 may be made of an insulating resin material whose heat resistance is ensured. Further, the insulating bolts 52 and 62 and the insulating washer 63 may be formed of a non-magnetic metal material and the surface thereof may be varnished to secure the insulating property.

In the present embodiment as described above, for example, the rib 31, the two spring plates 38, and the separator plate 35 can form a closed circuit-like portion. Further, referring to FIGS. 5 and 12, springs are in contact with the ribs 31 adjacent to each other in the circumferential direction, the spring plate 38 adjacent to each other in the circumferential direction between the ribs 31 adjacent to each other in the circumferential direction, and the ribs 31 adjacent to each other in the circumferential direction. The iron core holding plate 32, which is a circumferential member that does not contact the plate 38, and the separator plate 35, which is a circumferential member that contacts the spring plates 38 adjacent to each other in the circumferential direction and does not contact the rib 31, form a closed circuit-shaped portion CC3 ( (See FIG. 12) can be formed. However, in these closed circuit-shaped portions, the rib 31 and the spring plate 38 are electrically insulated, and the spring plate 38 and the separator plate 35 are electrically insulated, so that the stator core 20 leaks from the core. The magnetic flux suppresses the flow of eddy currents. As a result, the eddy current loss can be suppressed, and the thermal elongation of the constituent members of the support device 30'due to the temperature rise of the support device 30'can also be suppressed. Therefore, also in the present embodiment, it is possible to suppress the eddy current loss and the temperature rise that may occur due to the magnetic flux leaking from the stator core 20, and suppress the decrease in the operating efficiency of the rotary electric machine 1'and the generation of vibration. .. The constituent members of the support device 30'in the present embodiment may also be partially insulated only in the region on the end side in the axial direction of the stator core 20.

Further, in the present embodiment, the rib 31 and the spring plate 38 are electrically insulated, and the separator plate 35 and the spring plate 38 are electrically insulated, but the rib 31 and the iron core holding ring 33 are insulated. The rib 31 and the iron core holding plate 32 may be insulated from each other.

Although each embodiment has been described above, each of the above embodiments is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

1,1'... rotary machine, 10 ... stator, 11 ... stator frame, 12 ... outer peripheral plate, 20 ... stator core, 21 ... laminated iron core, 30, 30'... stator core support device, 31 ... rib, 32 ... Iron core holding plate, 33 ... Iron core holding ring, 34 ... Iron core support plate, 35 ... Separation plate, 36 ... Spring rod, 38 ... Spring plate, 40 ... Rotor, 51, 61 ... Insulating plate member, 52, 62 … Insulating bolt, CC1, CC2, CC3… Closed circuit part

Claims (8)

A plurality of types of support members for supporting the stator core to the stator frame arranged radially outside the stator core are provided.
The plurality of types of support members are combined so as to form a closed circuit-like portion.
An insulating portion is provided to electrically insulate a part of the closed circuit-shaped portion.
The plurality of types of support members include a plurality of axial members extending along the axial direction of the stator core and a plurality of circumferential members extending along the circumferential direction of the stator core.
A plurality of the axial members are arranged at intervals in the circumferential direction, and a plurality of ribs for fitting a groove formed in the outer peripheral portion of the stator core to hold the stator core, and the ribs. Including a plurality of spring plates interposed between the rib and the stator frame to elastically support the stator core.
The spring plates that are different from each other are connected to each of the ribs from one side and the other side in the circumferential direction.
The ribs adjacent to each other in the circumferential direction, the spring plate adjacent to each other in the circumferential direction between the ribs adjacent to each other in the circumferential direction, and the circumferential member which is in contact with the ribs adjacent in the circumferential direction and not in contact with the spring plate. The circumferential member, which is in contact with the spring plate adjacent to each other in the circumferential direction and is not in contact with the rib, forms the closed circuit-like portion.
A stator core support device in which the rib forming a part of the closed circuit-shaped portion and the spring plate are electrically insulated by being in contact with each other via the insulating portion . A plurality of types of support members for supporting the stator core to the stator frame arranged radially outside the stator core are provided.
The plurality of types of support members are combined so as to form a closed circuit-like portion.
An insulating portion is provided to electrically insulate a part of the closed circuit-shaped portion.
The plurality of types of support members include a plurality of axial members extending along the axial direction of the stator core and a plurality of circumferential members extending along the circumferential direction of the stator core.
In the plurality of types of support members, the two axial members separated in the circumferential direction and the two circumferential members separated in the circumferential direction form the closed circuit-like portion.
A stator core support device in which the axial member forming a part of the closed circuit-shaped portion and the circumferential member are electrically insulated by being in contact with each other via the insulating portion. The first aspect of the present invention, wherein the spring plate forming a part of the closed circuit-shaped portion and the circumferential member in contact with the spring plate are further electrically insulated by being in contact with each other via the insulating portion. Stator core support device. The axial member includes a shaft-shaped rib for fitting a groove formed in the outer peripheral portion of the stator core to hold the stator core.
The circumferential member includes an annular core holding plate for tightening the stator core along the axial direction from both ends of the rib.
The stator core support device according to claim 2, wherein the rib and the iron core holding plate are electrically insulated by being in contact with each other via the insulating portion. The axial member includes a shaft-shaped rib for fitting a groove formed in the outer peripheral portion of the stator core to hold the stator core.
The circumferential member includes an annular iron core holding ring that surrounds and holds the rib from the radial outside.
The stator core support device according to claim 2, wherein the rib and the iron core holding ring are electrically insulated by being in contact with each other via the insulating portion. The insulating portion includes an insulating plate member arranged between the rib and the spring plate, and an insulating bolt extending from the spring plate to the rib via the insulating plate member. The stator core support device described in. The insulating portion includes an insulating plate member arranged between the spring plate and the circumferential member in contact with the spring plate, and insulation from the spring plate to the circumferential member via the insulating plate member. The stator core support device according to claim 3 , which includes a sex bolt. A rotary electric machine including a stator and a rotor configured by supporting the stator core to a stator frame on the radially outer side by the stator core support device according to any one of claims 1 to 7 .

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