JP3749098B2 - Rotating electrical machine rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a rotating electrical machine using a permanent magnet, and more particularly to improvement of cooling technology.
[0002]
[Prior art]
A main motor using a rotating electric machine using a permanent magnet as a drive unit will be described as an example when mounted on a vehicle.
[0003]
In recent years, a main motor mounted on a vehicle completely covers the drive unit with a frame, a shell, or the like, rather than an open type with the drive unit exposed to the outside, in order to meet the demands of reducing running costs and reducing noise. The so-called fully-closed electric motors that have been made are becoming mainstream. This tendency is not limited to vehicles, but for main motors mounted on electric vehicles and hybrid cars, the same demands have shifted to a fully enclosed type in which the entire drive unit or a part thereof is covered with a frame or the like. is there.
[0004]
By the way, when the drive part of the main motor is covered with a frame or the like in this way, heat generated by the stator and the rotor constituting the drive part stays in the frame, and the frame and the main motor are The temperature rises, and the performance of the main motor is significantly reduced. Therefore, at present, the frame and the main motor are cooled by providing many fins on the outer wall of the housing to increase the surface area, or by providing a cooling jacket between the stator and the frame, and passing the coolant through the cooling jacket. Like to do.
[0005]
[Problems to be solved by the invention]
However, recently, rotating electric machines have been on the trend of higher temperatures due to the trend toward higher output and smaller size and increased heat generation density. For this reason, further improvement in cooling performance is required. In particular, in the case of a rotating electrical machine using a permanent magnet, the temperature of the rotor provided with the permanent magnet is prevented from a problem of demagnetization, and the electrical machine housed in the stator due to the restriction on the upper limit temperature of the insulator. It is necessary to prevent the temperature of the child coil from rising.
[0006]
The present invention has been made in view of the above, and an object thereof is to provide a rotor of a rotating electrical machine capable of improving the cooling performance of the rotating electrical machine.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, as a first feature of the rotor of the rotating electrical machine according to the present invention, a plurality of cavities are provided in the axial direction, and a permanent magnet for preventing magnetic flux leakage into the cavities is provided on the shaft. In a rotor of a rotating electrical machine having a rotor core provided in a direction and a presser plate for pressing both side surfaces of the rotor core, the presser plate has an opening corresponding to the cavity of the rotor core. It is in providing. Further, a partition plate is provided in a cavity formed by the cavity and the opening, and an end thereof protrudes from the side surface of the rotor.
[0008]
In the present invention, the presser plate is provided with an opening corresponding to the cavity of the rotor core, so that when the rotating electrical machine is driven and the rotor rotates, air is introduced into the cavity through the opening. Is flowing.
[0009]
Further, a partition plate is provided in the cavity formed by the cavity and the opening so as to protrude from the side surface of the rotor, so that the air flow to the cavity is improved.
[0010]
As a second feature of the rotor of the rotating electrical machine according to the present invention, the presser plate is provided with a radial notch on a surface contacting the rotor core. Further, the presser plate is provided with radial through holes in its radial direction.
[0011]
In the present invention, when the rotor core is rotated by providing radial notches on the surface of the presser plate that contacts the rotor core or by providing radial through holes in the radial direction of the presser plate. In addition, air is allowed to flow into the cavity of the rotor core through the notches and through-holes, and the in-machine air is allowed to flow in the radial direction by the so-called centrifugal fan effect, and is stored in the stator. The end of the armature coil can be cooled.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
[First Embodiment]
FIG. 1 is a radial direction view showing the configuration of the rotating electrical machine according to the present embodiment. 2 is a half cross-sectional view showing a cross section along the AA portion in the radial direction in FIG. 1, and FIG. 3 is a radial direction showing a cross section along the BB portion in the radial direction in FIG. It is sectional drawing.
[0014]
In these drawings, a rotating electrical machine is constituted by a substantially cylindrical stator 1 and a substantially columnar rotor 4 arranged inside the cylinder. The stator 1 and the rotor 4 share a rotating shaft 9 at the center thereof, and have a structure having a gap 3 between the inner periphery of the stator 1 and the outer periphery of the rotor 4.
[0015]
The stator 1 includes a stator core 20 that is a main body portion thereof, and an armature coil 2 that is housed in a slot that is provided on a side surface of the stator core 20 in the axial direction.
[0016]
The rotor 4 is made of a magnetic material such as a substantially cylindrical soft steel S45C, or a rotor core 6 formed by laminating magnetic materials such as a thin-pressure cylindrical silicon steel plate and a rotating shaft 9. The structure includes a holding plate 8 which is shared with the core 6 and is fixed by bolting, welding, or the like in order to press both side surfaces of the rotor core 6.
[0017]
The rotor core 6 is provided with four fan-shaped cavities 5 centering on the rotation shaft 9 so as to penetrate in the axial direction. Due to the four cavities 5, four magnetic pole portions 21 are formed in the rotor core 6 to constitute a so-called four-pole rotor. The rotor core 6 has permanent magnets 7 along the axial direction at eight locations near the end faces of the four sectors in order to prevent magnetic flux leakage into the cavity 5 and to form magnetic irregularities. Embedded.
[0018]
In addition, as a raw material of a permanent magnet, a high torque can be obtained more effectively than a conventional permanent magnet by using a rare earth magnet having a high magnetic energy product such as an NdFeB magnet.
[0019]
FIG. 4A is a radial arrow view showing the structure of the presser plate 8, and FIG. 4B is a longitudinal cross-sectional view showing a cross section along the CC section in the radial direction.
[0020]
The retainer plate 8 is provided with fan-shaped openings 40 similar to the cavity 5 at four positions corresponding to the cavity 5 provided in the rotor core 6.
[0021]
In addition, in the same figure, although the structure which provided the four opening parts 40 corresponding to all the four cavity parts 5 is shown, it is not necessarily required to provide the opening part 40 corresponding to all the cavity parts 5. Alternatively, there may be a portion that blocks the cavity 5.
[0022]
A partition plate 10 longer than the axial length of the rotor 4 is disposed along the axial direction at the center of each of the four cavities formed by the cavity 5 and the opening 40. Thereby, the partition plate 10 will have the part 11 which protruded the outer side of the rotor 4 in the both sides, as shown in FIG.
[0023]
Therefore, according to the present embodiment, the pressing plate 8 fixed to both side surfaces of the rotor core 6 is provided with the opening 40 corresponding to the cavity 5 of the rotor core 6, and the cavity 5 and the opening 40 provide the opening 40. By arranging the partition plate 10 longer than the axial length of the rotor 4 in each formed cavity, the opening 40 is opened from the partition plate 10 when the rotating electrical machine is driven and the rotor 4 rotates. Since air flows through the cavity 5 through the rotor 5, the rotor can be cooled, the air temperature in the rotating electrical machine can be averaged, and the cooling performance of the rotating electrical machine can be improved. it can.
[0024]
It should be noted that it is not always necessary to insert the partition plate 10 into all four cavities of the rotor 4 and may be arranged at an appropriate interval.
[0025]
[Second Embodiment]
Various modifications can be considered for the shape and arrangement of the partition plate 10 in the first embodiment. Hereinafter, the modification is demonstrated. The same reference numerals as those in FIGS. 1 to 4 are assigned the same reference numerals, and the description thereof is omitted here.
[0026]
FIG. 5 is a half cross-sectional view showing the configuration of the rotor 4 in the present embodiment. The feature is that an upper notch 12 is provided at the upper center of the partition plate 10 and lower cuts are made at the lower left and right. The notch 13 is provided. Of course, the notch part may be provided only in either the upper part or the lower part, or the number of each may be changed.
[0027]
FIG. 6 is a diagram showing the air flow in the cavity 5 when the upper cutout 12 is provided. As described above, when the rotor 4 rotates in the rotation direction 30, the air flows along the flow direction 31 from one side of the hollow portion 5, which is closed by the partition plate 10, to the other side. Become.
[0028]
FIG. 7 is a view showing the air flow in the cavity 5 when the lower notch 13 is provided. As described above, when the rotor 4 rotates in the rotation direction 30, the air flows along the flow direction 32.
[0029]
FIG. 8 is a half cross-sectional view showing another configuration of the rotor 4 and is characterized in that an opening 14 is provided along the axial direction at the center of the partition plate 10. This configuration also allows air to flow from one side of the cavity 5 to the other side.
[0030]
FIG. 9 is a half cross-sectional view showing still another configuration of the rotor 4. As a feature thereof, two partition plates 15a and 15b having a short length are replaced with the side surface of the rotor instead of the partition plate 10. 8 is arranged so as to have the protruding portion 11 on one side and the other side, and a space where no partition plate is present is provided in the central portion in the axial direction so that the portion corresponding to the opening 14 in FIG. 8 is widened. .
[0031]
FIG. 10 is a diagram showing a modification of the partition plates 15a and 15b in FIG. 9, and shows a configuration in which the upper notch 12 is provided on the upper portions of the partition plates 15a and 15b.
[0032]
FIG. 11 is a diagram showing another modification of the partition plates 15a and 15b in FIG. 9, and the radial size of the portion 19 protruding outward from the rotor 4 is made larger than that of the cavity 5 and the opening 40. The configuration is shown.
[0033]
FIGS. 12 and 13 are half cross-sectional views showing still another configuration of the rotor 4, and the feature thereof is that the partition plate 16 a has the protruding portion 11 only on one side of the side surface of the rotor 4. And the partition plate 16b adjacent to the partition plate 16a is disposed so as to have the protruding portion 11 only on the other side of the side surface of the rotor 4, so that the protruding portion 11 is connected to one of the side surfaces of the rotor. The other is that each cavity is alternately formed. With this configuration, the air that has entered the hollow portion 5 from the protruding portion 11 flows smoothly to the direction where the protruding portion 11 is not present.
[0034]
FIG. 14 is a view showing a modification of the partition plate 16a of FIG. 12, and shows a configuration in which the upper notch portion 12 and the lower notch 13 are provided on the partition plate 16a.
[0035]
FIG. 15 is a diagram showing another modification of the partition plate 16a of FIG. 12, and shows a configuration in which the opening 14 is provided in the partition plate 16a.
[0036]
16 and 17 are radial sectional views of the cavity 5 showing the arrangement of the partition plates. The partition plates 10, 15, 16 may be arranged in the fan-shaped central portion 17 shown in FIG. 16 as described above, or arranged in the portion 18 in contact with the fan-shaped end face as shown in FIG. You may be made to do.
[0037]
Therefore, according to the present embodiment, by configuring the shape and arrangement of the partition plates as described above, the air flow to the cavity 5 can be improved, and thus the rotating electrical machine Cooling performance can be improved.
[0038]
[Third embodiment]
Various modifications can be considered for the structure of the presser plate 8 in the first and second embodiments. Hereinafter, the modification is demonstrated. Since the opening 40 is provided in the presser plate 8 and the partition plates 10, 15, 16 are disposed in the cavity 5 of the rotor core 6, the description is omitted here because it is the same as in the above embodiment. To do.
[0039]
FIG. 18A is a radial arrow view showing the structure of the presser plate 28 in the present embodiment, and FIG. 18B is a longitudinal sectional view showing a cross section along the DD portion in the radial direction. It is. The presser plate 28 in the same figure is provided with four notches 23 radially on the surface in contact with the rotor core 6.
[0040]
FIG. 19A is a radial arrow view showing another configuration of the presser plate 28, and FIG. 19B is a longitudinal cross-sectional view showing a cross section along the DD portion in the radial direction. The presser plate 38 in the figure is provided with four through holes 24 radially in the radial direction.
[0041]
By fixing these presser plates 28 and 38 to both side surfaces of the rotor core 6, when the rotor core 6 rotates, the notch portion 23 and the through hole 24 also rotate. Since air flows in the cavity 5, the rotor 4 can be cooled. Further, since the in-machine air flows in the radial direction due to the so-called centrifugal fan effect, the end of the armature coil 2 provided in the stator 1 can be cooled, thereby improving the cooling performance of the rotating electrical machine.
[0042]
20A is a radial arrow view showing still another configuration of the presser plate 28, and FIG. 20B is a longitudinal cross-sectional view showing a cross section along the DD portion in the radial direction. . In the holding plate 48 in the figure, four protrusions 25 are provided radially on the opposite surface of the surface that contacts the rotor core 6 in the radial direction. Further, a notch portion 23 is provided on the surface in contact with the rotor core 6 as in FIG.
[0043]
By fixing the pressing plate 48 to both side surfaces of the rotor core 6, the protrusion 25 rotates when the rotor core 6 rotates, so that air flows into the cavity 5 of the rotor core 6. As a result, the rotor 4 can be cooled.
[0044]
Instead of providing the notch 23, a through hole 24 may be provided as shown in FIG. In such a case, the same effect as described above can be obtained.
[0045]
Therefore, according to the present embodiment, by configuring the presser plate as described above, the air flow to the cavity 5 can be improved, and the rotor coil 2 is cooled. Therefore, the cooling performance of the rotating electrical machine can be improved.
[0046]
【The invention's effect】
As described above, according to the rotor of the rotating electrical machine according to the present invention, the rotating electrical machine is driven to rotate the rotor by providing the holding plate with the opening corresponding to the cavity of the rotor core. Sometimes air flows into the cavity through the opening so that the rotor can be cooled.
[0047]
In addition, since the partition plate is provided in the cavity formed by the cavity and the opening so as to protrude from the side surface of the rotor, the air flow to the cavity is improved, so that the rotor can be further cooled. Therefore, the cooling performance of the rotating electrical machine can be improved.
[0048]
Furthermore, a radial notch is provided on the surface of the presser plate that contacts the rotor core, or a radial through-hole is provided in the radial direction of the presser plate, so that a cavity portion can be formed through the notch and the through-hole. In addition, air flows in the radial direction due to the so-called centrifugal fan effect, so that the end of the armature coil housed in the stator can be cooled, thereby improving the cooling performance of the rotating electrical machine. Can do.
[Brief description of the drawings]
FIG. 1 is a radial arrow view showing a configuration of a rotating electrical machine according to a first embodiment.
2 is a half-body cross-sectional view showing a cross-section along the AA portion in the radial direction in FIG. 1;
FIG. 3 is a radial cross-sectional view showing a cross section along the BB portion in the radial direction in FIG. 2;
FIG. 4 (a) is a radial arrow view showing the structure of the presser plate 8, and FIG. 4 (b) is a longitudinal sectional view showing a cross section along the CC section in the radial direction. is there.
FIG. 5 is a half cross-sectional view showing a configuration of a rotor 4 in a second embodiment.
6 is a view showing the air flow in the cavity 5 when the upper cutout 12 is provided. FIG.
FIG. 7 is a view showing the air flow in the cavity 5 when the lower notch 13 is provided.
FIG. 8 is a half cross-sectional view showing another configuration of the rotor 4;
9 is a half cross-sectional view showing still another configuration of the rotor 4. FIG.
10 is a view showing a modification of the partition plates 15a and 15b in FIG.
11 is a view showing another modification of the partition plates 15a and 15b in FIG.
12 is a half cross-sectional view showing still another configuration of the rotor 4. FIG.
FIG. 13 is a half cross-sectional view showing still another configuration of the rotor 4;
14 is a view showing a modification of the partition plate 16a of FIG.
15 is a view showing another modification of the partition plate 16a of FIG.
FIG. 16 is a radial cross-sectional view of the cavity 5 showing the arrangement of the partition plates.
FIG. 17 is a radial cross-sectional view of the cavity 5 showing another arrangement of the partition plates.
FIG. 18 (a) is a radial arrow view showing the structure of the presser plate 28 in the third embodiment, and FIG. 18 (b) shows a cross section taken along the line DD. It is a longitudinal cross-sectional view.
FIG. 19 (a) is a radial arrow view showing another configuration of the presser plate 28, and FIG. 19 (b) is a vertical cross section showing a cross section along the DD portion in the radial direction. FIG.
FIG. 20 (a) is a radial arrow view showing still another configuration of the presser plate 28, and FIG. 20 (b) is a longitudinal section showing a cross section along the DD portion in the radial direction. It is a top view and the figure (c) is a longitudinal cross-sectional view which shows another structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator 2 Armature coil 3 Space | gap 4 Rotor 5 Cavity part 6 Rotor core 7 Permanent magnet 8, 28, 38, 48 Holding plate 9 Rotating shaft 10, 15, 16 Partition plate 11 Overhang | projection part 12 Upper notch part 13 Lower notch portion 14 Opening portion 17 Fan-shaped central portion 18 Portion 19 in contact with fan-shaped end surface Enlarged protruding portion 20 Stator core 21 Magnetic pole portion 23 Notch portion 24 Through-hole 25 Protruding portion 30 Rotating directions 31, 32 Flow direction 40 Opening Part

Claims (10)

A rotor core in which a plurality of cavities are provided in the axial direction, and permanent magnets for preventing magnetic flux leakage to the cavities are provided in the axial direction, and a presser plate for pressing both side surfaces of the rotor core. In the rotor of the rotating electrical machine having
Rutotomoni an opening corresponding to the hollow portion of the rotor core in the holding plate, a partition plate provided in a cavity formed by the cavity and the opening, so as to protrude the end portion from the side of the rotor A rotor of a rotating electrical machine characterized by that. The partition plate may be one that is longer than the axial length of the rotor, the rotor of the rotating electric machine according to claim 1, characterized in that it is arranged so as to protrude from both sides of the rotor . The partition plate is formed by two partition plates for one side and the other side of a rotor side surface, and each partition plate is disposed so as to protrude from each side surface. The rotor of the rotary electric machine according to 1 . The partition plate, the rotor of the rotating electric machine according to claim 1, wherein the position protruding from the rotor, characterized in that arranged alternately for the respective cavities in the one and the other rotor side. The partition plate, the rotor of the rotating electric machine according to any one of claims 1 to 4, characterized in that it is arranged so as to separate a central portion of the cavity of the radial cross section. The rotation of the rotating electrical machine according to any one of claims 1 to 5 , wherein the partition plate is provided with a notch along the axial direction on at least one of the outer peripheral side and the inner peripheral side. Child. The rotor of a rotating electric machine according to any one of claims 1 to 6 , wherein the partition plate is provided with an opening along the axial direction. The partition plate, the rotor of the rotating electric machine according to any one of claims 1 to 4, characterized in that it is arranged to contact the end position of the cavity. The pressing plate, the rotor of the rotating electric machine according to any one of claims 1 to 8, characterized in that said plurality of notches on a surface in contact with the rotor core is provided radially. The rotor of the rotating electrical machine according to any one of claims 1 to 9 , wherein the presser plate is provided with a plurality of through holes in a radial direction in a radial direction thereof.

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