JP4878908B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a stator end structure comprising a stator end plate of the rotating electrical machine.

A stator end plate of a rotating electrical machine in the prior art has a configuration in which the stator end plate lower plate 4b is omitted from the configuration shown in FIG. 1 showing an embodiment according to the present invention (for example, Patent Document 1). reference).
The stator core 1 constituting the rotating electrical machine is configured by laminating thin silicon steel plates made of a magnetic material.
The stator core 1 is fixed in the axial direction by the tooth-type presser 2 disposed on the axial end surface of the stator core 1. An end portion 3a of the stator coil 3 accommodated in a stator slot (not shown in FIG. 1) provided on the inner peripheral surface of the stator core protrudes from an end surface of the stator core 1 provided with the tooth-shaped presser 2. Yes.
The stator end structure EA is configured by a stator end plate 4a made of a magnetic material.
The core bolt 5 is installed on the outer peripheral side of the stator core 1 and passes through the stator core 1, the tooth-type presser 2 and the stator end plate 4 a, and the core core 5 causes the stator core 1 to become the tooth-type presser 2 and the stator It is tightened from the axial direction via the end plate upper plate 4a.

JP 2003-219583 A

Leakage magnetic flux from the rotor coil end (not shown) and the stator coil end 3a enters the stator end plate 4a. This leakage magnetic flux enters the stator end plate 4a from the N pole of the rotor coil (not shown) and the stator coil 3, and reaches the S pole through the circumferential direction.
At this time, a loss occurs in the stator end plate 4a due to the penetration of magnetic flux. The loss is roughly divided into the following two. One is eddy current loss caused by magnetic flux penetrating perpendicularly to the stator end plate 4a, and the other is eddy current loss and hysteresis loss caused by traveling in the circumferential direction in the stator end plate 4a. . Since a large amount of magnetic flux penetrates into the inner diameter side of the stator end plate 4a close to the rotor coil end and the stator coil end 3a, a large loss occurs at this portion.
In the conventional rotating electric machine, there is a problem that the loss occurs in the stator end plate 4a as described above, and the efficiency is lowered.
As a measure for reducing the loss in the stator end plate 4a, there is a method in which a nonmagnetic material such as stainless steel is applied to the stator end plate 4a. The stator end plate 4a extends the stator core 1 from both end surfaces in the axial direction. Since it is fastened and requires a certain amount of thickness in order to have sufficient strength, there is a problem that it becomes expensive to use all non-magnetic materials.

  The present invention has been made to solve the above-described problems, and reduces the amount of non-magnetic material used to reduce the loss at the end of the stator, thereby improving the efficiency of the rotating electrical machine and tightening. An object of the present invention is to obtain a rotating electrical machine having a stator end structure having a sufficient strength against bending stresses.

In the rotating electrical machine according to the present invention, a stator core formed by laminating a plate-like electromagnetic member having a slot for storing a stator coil, a tooth type presser formed of an annular member forming an end face of the stator core, An end portion of the stator coil protruding from an end face of the stator core provided with a tooth-shaped presser, and a piece formed of an annular plate provided on the outer diameter side of the stator coil, An inner piece made of a non-magnetic material that constitutes the inner side of the stator end structure that tightens the stator core provided with a tooth-shaped presser on the end face in the axial direction from both end faces by bolting; and the stator end An outer part piece made of a magnetic material having a thickness larger than that of the inner part piece , the outer part piece being an end part of the stator. The inner diameter is larger than the inner piece of the component It is those formed by members.

According to the present invention, the outer part piece made of the magnetic material of the stator end part structure for fastening the stator core provided with the tooth-shaped presser on the end face in the axial direction from both end faces by bolting is made of the non-magnetic material. By using a member with a larger thickness and inner diameter than the inner piece, the amount of non-magnetic material used is reduced, the loss at the end of the stator is reduced, and the efficiency of the rotating electrical machine is improved. It is possible to obtain a rotating electrical machine including a stator end portion structure having sufficient strength against bending stress.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view showing a configuration of a stator end plate of a rotating electrical machine according to Embodiment 1. FIG. FIG. 6 is an explanatory view showing a stator end plate bending moment distribution when the core bolt is tightened.

In FIG. 1, a stator core 1 of a stator SA that constitutes a rotating electrical machine together with a rotor RA is formed by laminating thin silicon steel plates made of a magnetic material.
The stator core 1 is fixed in the axial direction by the tooth-type presser 2 disposed on the axial end surface of the stator core 1. The end 3a of the stator coil 3 accommodated in a stator slot (not shown in FIG. 1) provided on the inner peripheral surface of the stator core is made of an annular plate material centering on the central axes of the rotor RA and the stator SA. It protrudes from the end face of the stator core 1 provided with the tooth-shaped presser 2.
The stator end structure EA includes a stator end plate upper plate 4a made of a magnetic material, and a non-magnetic stator end plate disposed between the tooth-type presser 2 and the stator end plate upper plate 4a. It is constituted by the lower plate 4b.
The stator end plate upper plate 4a and the stator end plate lower plate 4b are formed of an annular plate centered on the central axis of the rotor RA and the stator SA, and the stator end plate upper plate 4a and the stator end plate bottom The outer diameter of the plate 4b is the same, and the inner diameter of the stator end plate upper plate 4a is set larger than the inner diameter of the stator end plate lower plate 4b.
The core bolt 5 is installed on the outer peripheral side of the stator core 1 and penetrates through the stator core 1, the tooth type presser 2, and the stator end plate upper plate 4 a and the stator end plate lower plate 4 b of the stator end structure EA. Then, the stator core 1 is tightened from the axial direction by the core bolt 5 via the tooth-type presser 2 and the stator end plate upper plate 4a and the stator end plate lower plate 4b of the stator end structure EA.

Next, the operation will be described. By adopting the above structure, the leakage flux from the rotor coil end (not shown) and the stator coil end 3a is concentrated, and the inside of the stator end structure EA having a high loss density is the stator end plate. Since it is a nonmagnetic material by the lower plate 4b, the loss can be reduced.
Further, a bending moment distribution 10 as shown in FIG. 6 acts on the stator end plate upper plate 4a, but the stator end plate is located near the core bolt 5 where the bending moment at the time of tightening is increased by the above structure. The bending stress is reduced by the reinforcing action of the upper plate 4a.
On the other hand, the inner diameter side of the stator end structure EA has a small bending moment and does not require a reinforcing action, and the inner diameter dimension of the stator end plate upper plate 4a can be made larger than that of the stator end plate lower plate 4b. .
In the first embodiment, since the amount of nonmagnetic material used is reduced compared to the case where all of the stator end plates 4a and 4b constituting the stator end structure EA are made of nonmagnetic material, the loss is reduced at a low cost. Can be reduced.

According to the first embodiment of the present invention, a plate-like electromagnetic member made of a thin plate-like silicon steel plate made of a magnetic material having a slot (not shown in FIG. 1) for housing the stator coil 3 is fixed. The child core 1, the inner piece 4b made of a nonmagnetic material constituting the inner side of the stator end structure EA for fastening the stator core 1 in the axial direction from both end faces by bolting with the core bolt 5, and the fixing An outer portion piece 4a made of a magnetic material that forms the outer side of the child end structure EA, and the outer piece 4a is sufficient for bending when the core bolt 5 of the stator end portion structure EA is bolted. The inner end piece 4b of the stator end structure EA has the same outer diameter as the outer end piece 4b, but has a larger inner diameter than the inner end piece 4b of the stator end structure EA. So non-magnetic material Rotation equipped with a stator end structure that has sufficient strength against bending stress during tightening, while reducing the amount used and reducing the loss at the stator end to improve the efficiency of the rotating electrical machine. An electric machine can be obtained.
That is, in the stator end structure EA for fastening the stator core 1 formed by stacking fan-shaped thin silicon steel plates having slots (not shown in FIG. 1) for housing the stator coil 3 in the axial direction from both end faces, Generated in the stator end structure EA by leakage magnetic flux from the end (not shown) of the rotor coil installed in the rotor RA located at the center of the child SA and the end 3a of the stator coil 3 The stator end plate lower plate 4b made of a non-magnetic material and a stator end plate lower plate 4b made of the non-magnetic material having sufficient strength against bending when the core bolt 5 is tightened. A stator end part structure of a rotating electrical machine having a stator end plate upper plate 4a made of a magnetic material and having a large inner diameter dimension and installed on an end surface in the axial direction of the stator end plate lower plate 4b made of the non-magnetic material. EA is configured.
In other words, the stator end plate lower plate 4b made of a nonmagnetic material on the end face of the tooth mold presser 2 and the stator end plate made of a magnetic material having a larger inner diameter than the stator end plate lower plate 4b and having a sufficient thickness. The plate 4a is installed.
Accordingly, since a thick magnetic material having a large inner diameter is provided outside the thin non-magnetic material, the inner side where the loss density is high is a non-magnetic material, so there is little loss, and the vicinity of the core bolt 5 where the bending stress during tightening is high is a reinforcing plate. As a result, the strength is secured. By adopting this structure, it is possible to reduce the loss at a lower cost compared to the case where the stator end structure EA is entirely made of a nonmagnetic material.
In this way, compared to the case where the stator end structure EA is entirely made of a non-magnetic material, the amount of non-magnetic material used is reduced, so the loss at the stator end is reduced and the efficiency of the rotating electrical machine is improved. In addition, the stator end structure EA having sufficient strength against the bending stress at the time of tightening can be obtained.

Embodiment 2. FIG.
A second embodiment according to the present invention will be described with reference to FIG. FIG. 2 is a longitudinal sectional view showing a configuration of a stator end plate of the rotating electrical machine in the second embodiment.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 2, an inclined portion 6a is provided at the inner diameter side end portion 6 of the stator end plate lower plate 4b so as to reduce the plate thickness in the inner diameter direction. By processing the end portion 6 forming the apex portion in an inclined manner in this way, the concentration of eddy current at the corner portion can be reduced, so that loss can be reduced and local overheating is prevented. can do.
In the prior art, the inner diameter side of the stator end plate 4a may be processed in an inclined shape. However, since the conventional stator end plate is usually made of a magnetic material, the loss due to the inclined processing is not possible. The reduction is small.
In the second embodiment, since the stator end plate 4b is made of a nonmagnetic material, the loss can be reduced as compared with the conventional structure. Further, when the conventional stator end plate is made of a non-magnetic material, the thickness is increased in order to ensure the strength of the stator end plate. In the second embodiment, however, the thickness is increased because the stator end plate upper plate 4a is provided. The loss can be reduced at a lower cost.

According to the second embodiment of the present invention, in the configuration in the first embodiment, the end portion 6 that forms the cusp portion on the inner diameter side of the stator end portion lower plate 4b that constitutes the stator end plate structure EA is inclined. 6a is provided to reduce the concentration of eddy currents generated by leakage magnetic flux from the coil end, reducing the amount of non-magnetic material used and reducing the loss at the stator end at low cost. A stator end structure that improves the efficiency of a rotating electrical machine, has sufficient strength against bending stress during tightening, and can reduce loss and prevent local overheating. Can be obtained.
In other words, leakage from the end 6 forming the cusp corner portion on the inner diameter side processing to the inclined form an inclined portion 6a rotor coil end portion and the stator coil ends of the stator end plate the lower plate 4 b The stator end plate of the rotating electric machine according to the first embodiment having the feature of reducing the concentration of eddy currents generated by the magnetic flux is configured.
Therefore, since the stator end plate lower plate 4b is made of a non-magnetic material, the loss can be reduced as compared with the conventional structure. Further, since the stator end plate upper plate 4a is provided, the thickness of the stator end plate lower plate 4b is reduced. The loss can be reduced at a lower cost.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a longitudinal sectional view showing a configuration of a stator end plate of the rotating electrical machine in the third embodiment.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment or the second embodiment described above, and exhibits the same operation. It is. In the drawings, the same reference numerals indicate the same or corresponding parts.

As shown in FIG. 3, by providing an insulating plate 7 made of an annular plate material between the stator end plate upper plate 4a and the stator end plate lower plate 4b, the stator end plate upper plate 4a and the stator end plate lower can block the eddy current flowing across the plate 4b, and reduction or excessive heat loss in the stator end structure EA consisting of stator end plates can be prevented.

According to the third embodiment of the present invention, in the configuration in the first or second embodiment, the outer end piece and the stator end plate formed of the stator end plate upper plate 4a of the stator end structure EA. Since the insulating member made of the insulating plate 7 for interrupting the eddy current is provided between the inner piece made of the lower plate 4b, the amount of non-magnetic material used can be reduced and the loss at the stator end can be made inexpensively. Thus, it is possible to improve the efficiency of the rotating electrical machine, and it is possible to obtain a rotating electrical machine including a stator end structure having sufficient strength against bending stress during tightening.
Ie, Embodiment 1 or Embodiment characterized in that a dielectric plate 7 to block an eddy current between the stator end plate upper plate 4a and the stator end plate the lower plate 4b The stator end plate constituting body EA composed of the stator end plate of the rotating electrical machine described in 2 is configured.
Therefore, by providing the insulating plate 7 between the stator end plates 4a and 4b, the eddy current flowing across the stator end plates 4a and 4b can be interrupted, and the stator end portion composed of the stator end plates the reduction or excessive heat loss in the construct EA can be prevented.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a top view and a cross-sectional view showing a configuration of an insulating plate provided with a ventilation groove in the fourth embodiment. 4A shows a top view, and FIG. 4B shows a cross-sectional view taken along line BB in FIG. 4A.
In the fourth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in any of the first to third embodiments described above, and is similar. It has an effect. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 4, the diameter of the stator SA is formed on the joint surface between the stator end plate upper plate 4a and the stator end plate upper plate 4a which is the upper surface of the insulating plate 7 provided between the stator end plate upper plate 4b. A ventilation groove 8 extending in the direction is provided. By providing the groove 8, the cooling air flows through the groove 8 to cool the stator end plate upper plate 4 a from the back surface, and it is possible to prevent overheating of the stator end structure EA including the stator end plate.
Further, the same effect can be obtained by providing a ventilation groove on the joint surface with the insulating plate 7 which is the lower surface on the stator end plate upper plate 4a side .
Further, a groove for ventilation may be provided on the joint surface with the stator end plate upper plate 4b which is the lower surface of the insulating plate 7, and the joint surface with the insulating plate 7 which is the upper surface of the stator end plate lower plate 4b. You may provide the groove | channel for ventilation.

According to the fourth embodiment of the present invention, in the configuration of the third embodiment, the outer end piece and the stator end made of the stator end plate upper plate 4a of the stator end constituting body EA made of the stator end plate. Is the ventilation groove 8 provided on the surface of the insulating member made of the insulating plate 7 interposed between the inner piece made of the lower plate 4b and the outer piece made of the stator end plate upper plate 4a? A groove 8 for ventilation is provided on the surface of the outer end piece of the stator end plate upper plate 4a facing the insulating member of the insulating plate 7, or the stator end plate lower plate 4b of the insulating member of the insulating plate 7 is provided. The groove 8 for ventilation is provided on the surface facing the inner piece made of or the radial direction of the stator SA on the surface facing the insulating member made of the insulating plate 7 of the inner piece made of the stator end plate lower plate 4b. By providing a ventilation groove 8 extending to the outer end piece of the stator end plate upper plate 4a or fixed In the inner piece consisting of an end plate lower plate 4b as was provided grooves 8 for ventilation between the insulating member made of an insulating plate 7, inexpensively stator end by reducing the amount of non-magnetic material The loss at the part is reduced to improve the efficiency of the rotating electrical machine, and it has sufficient strength against the bending stress at the time of tightening, and also prevents overheating of the stator end structure EA composed of the stator end plate A rotating electric machine having a stator end structure that can be obtained can be obtained.
That is, the grooves for ventilation on the surface facing the stator end plate top plate 4a and the stator end plate the lower plate 4 b of the insulating plate 7 between the stator end plate upper plate 4a stator end plate the lower plate 4 b The stator end structure EA including the stator end plate of the rotating electric machine according to the third embodiment is configured with the structure provided with 8.
That is, the groove 8 is provided on the surface of the insulating plate 7 between the stator end plate upper plate 4a and the stator end plate lower plate 4b facing the stator end plate upper plate 4a and the stator end plate lower plate b. The cooling air flows through the structure.
Therefore, it is possible to prevent overheating of the stator end structure EA composed of the stator end plate.

Embodiment 5 FIG.
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a plan view showing the configuration of the stator end plate of the rotating electrical machine in the fifth embodiment.
In the fifth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in any of the first to fourth embodiments described above, and is similar. It has an effect. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 5 shows a configuration similar to that of the stator end plate shown in FIG. 1 according to the first embodiment, as viewed from the arrow A shown in FIG. However, the coil end 3 is omitted.
In the fifth embodiment, the stator end plate lower plate 4b is provided with slits 9 extending in the radial direction of the stator SA. By providing the slit 9, the circumference of the eddy current path becomes longer and the resistance of the eddy current circuit becomes larger, so that eddy current loss can be further reduced.

According to Embodiment 5 of the present invention, in the configuration of any one of Embodiments 1 to 4, the stator end plate lower plate made of a nonmagnetic material of the stator end structure EA. Since the slit 9 for reducing the heat generated by the eddy current is provided in the inner piece consisting of 4b, the amount of non-magnetic material used is reduced and the loss at the stator end is reduced at a low cost, thereby improving the efficiency of the rotating electrical machine. In addition, it is possible to obtain a rotating electrical machine having a stator end structure that has sufficient strength against bending stress during tightening and can reduce heat generation due to eddy currents.
That is, from the stator end plate of the rotating electrical machine according to any one of the first to fourth embodiments having the function of reducing the heat generated by the eddy current by providing the slit 9 in the stator end plate lower plate 4b. This constitutes the stator end part structure EA.
In other words, the slit 9 is provided in the stator end plate lower plate 4b to reduce the heat generated by the eddy current.
And by providing the slit 9 in the stator end plate lower plate 4b, the circumference of the eddy current path becomes longer and the resistance of the eddy current circuit becomes larger, so that the eddy current loss can be further reduced.

It is a longitudinal cross-sectional view which shows the structure of the stator end plate of the rotary electric machine in Embodiment 1 by this invention. It is a longitudinal cross-sectional view which shows the structure of the stator end plate of the rotary electric machine in Embodiment 2 by this invention. It is a longitudinal cross-sectional view which shows the structure of the stator end plate of the rotary electric machine in Embodiment 3 by this invention. It is the top view and sectional drawing which show the structure of the groove | channel provided in the insulating plate in Embodiment 4 by this invention. It is a top view which shows the structure of the stator end plate of the rotary electric machine in Embodiment 5 by this invention. It is explanatory drawing which shows a stator end plate bending moment distribution at the time of core bolt fastening.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core, 2 Tooth type presser, 3 Stator coil, 3a Stator coil end part, 4a Stator end plate upper plate (magnetic material), 4b Stator end plate lower plate (nonmagnetic material), 5 core bolt, 6 Inner diameter side end of the stator end plate lower plate 4b, 6a inclined processing portion, 7 insulating plate, 8 grooves, 9 slits, 10 bending moment distribution.

Claims (5)

A stator core formed by laminating a plate-like electromagnetic member having a slot for storing a stator coil, a tooth type presser comprising an annular member forming an end face of the stator core, and the tooth type presser provided with the tooth type presser An end of the stator coil protruding from the end face of the stator core, and a piece formed of an annular plate provided on the outer diameter side of the stator coil, the tooth type presser being provided on the end face The stator core is tightened in the axial direction from both end faces by bolt tightening, and an inner part piece made of a nonmagnetic metal material constituting the inner side of the stator end part structure and the outer side of the stator end part structure are configured. And an outer part made of a magnetic material having a larger thickness than the inner part, and the outer part is more than the inner part of the stator end structure. Is also formed of a member with a large inner diameter. Rotating electric machine according to symptoms. 2. The rotating electrical machine according to claim 1, wherein an inclined machining portion is provided at a cusp portion on an inner diameter side of the inner piece in the stator end structure.   The rotating electrical machine according to claim 1 or 2, wherein an insulating member is provided between an outer piece and an inner piece of the stator end structure.   The rotating electrical machine according to claim 3, wherein a groove for ventilation is provided between an outer side piece or an inner side piece of the stator end structure and the insulating member.   The rotary electric machine according to any one of claims 1 to 4, wherein a slit is provided in an inner piece of the stator end structure.

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