WO2018142441A1

WO2018142441A1 - Axial gap rotary electric machine

Info

Publication number: WO2018142441A1
Application number: PCT/JP2017/003289
Authority: WO
Inventors: 恭永米岡; 高橋　秀一; 利文鈴木; 酒井　亨; 高橋　大作; 大地野村; 潤櫻井
Original assignee: 株式会社日立産機システム
Priority date: 2017-01-31
Filing date: 2017-01-31
Publication date: 2018-08-09
Also published as: CN110089010A; JP6857670B2; JPWO2018142441A1

Abstract

A conventional axial gap rotary electric machine has a problem in that after the rotary electric machine is assembled, an air gap between a rotor and a stator cannot be visually observed, and hence it cannot be determined whether the air gap is defective after the assembly, which leads to an increase in the failure rate. In order to solve the problem, the axial gap rotary electric machine according to the present invention includes: a rotor which rotates about a main shaft; a stator which is disposed to be opposed to the rotor in a main shaft direction; a housing which fixes the stator; and a bracket which is coupled to the housing to hold a bearing and to which the rotor is rotatably held, and the axial gap rotary electric machine has a configuration in which the rotor and the stator are arranged inside the housing and the housing has a through hole located on a radially extending line of an air gap between the rotor and the stator.

Description

Axial gap type rotating electrical machine

The present invention relates to an axial gap type rotating electrical machine in which a rotor and a stator are opposed in the axial direction.

Since the axial gap type rotating electrical machine has a structure in which the rotor and the stator are opposed to each other in the axial direction, the axial length can be shortened compared to the radial gap type, and the rotating electrical machine itself can be made thinner. On the other hand, in the production and assembly, it is necessary to adjust the gap between the rotor and the stator.

As a background art in this technical field, there is JP-A-2015-61394 (Patent Document 1). Patent Document 1 discloses a 1 rotor-2 stator type axial gap type rotating electrical machine, in which a crankshaft is provided on one side of a crankshaft supported by a crankcase via a bearing, and an adapter is attached to the tapershaft. A first stator case including the first stator is attached to the crankcase. Next, a rotor is assembled to the adapter fixed to the taper shaft, and a shim having a predetermined thickness dimension is sandwiched between the adapter and the rotor in order to adjust an air gap between the rotor and the stator. And the structure attached with respect to a 1st stator case is disclosed so that the 2nd stator case provided with the 2nd stator may pinch | interpose a rotor.

Japanese Patent Laying-Open No. 2015-61394

In Patent Document 1, the shim is sandwiched and adjusted to adjust the air gap between the rotor and the stator. After the assembly, the rotor and the stator are covered with the first and second stator cases. There is a problem that the air gap cannot be visually confirmed. Therefore, after assembling, it cannot be determined whether the air gap is defective, and there is a concern that the defect rate increases.

In view of the above-described background art and problems, the present invention is an axial gap type rotating electrical machine, which is a rotor that rotates about a main shaft, and a stator that is disposed to face the rotor in the main shaft direction. A stator that fixes the stator, and a bracket that is coupled to the housing and that holds the bearing and the rotor is rotatably held. The rotor and the stator are disposed inside the housing, and the rotor and the stator are disposed between the rotor and the stator. It was set as the structure which has a through-hole located in the radial direction extension line of an air gap in a housing.

According to the present invention, it is possible to provide an axial gap type rotating electrical machine capable of visually confirming an air gap after assembly.

FIG. 3 is a schematic diagram showing only a cross section on one side with respect to the main shaft of the axial gap type rotating electric machine in the first embodiment. FIG. 3 is a schematic diagram of a configuration viewed from a through hole of the axial gap type rotating electric machine in Example 1, and is a diagram in the case where the through hole shape is a circle. FIG. 3 is a schematic diagram of a configuration viewed from a through hole of an axial gap type rotating electrical machine in Example 1, and is a view when the through hole shape is an ellipse. FIG. 2 is a schematic diagram of a configuration viewed from a through hole of an axial gap type rotating electrical machine in Example 1, and is a diagram in the case where the through hole shape is a horizontally long rectangle. FIG. 2 is a schematic diagram of a configuration viewed from a through hole of an axial gap type rotating electrical machine in Example 1, and is a view when the through hole shape is a rectangle. FIG. 2 is a schematic diagram of a configuration viewed from a through hole of an axial gap type rotating electric machine in Example 1, and is a view when the through hole shape is a vertically long ellipse. FIG. 2 is a schematic diagram of a configuration viewed from a through hole of an axial gap type rotating electric machine in Example 1, and is a diagram in the case where the through hole shape is a vertically long rectangle. FIG. 3 is a schematic diagram showing the position of a through hole when the axial gap type rotating electrical machine in the first embodiment is viewed from the main axis direction, and is a view in the case where there is a through hole at one place on the upper surface. It is a schematic diagram showing the position of the through hole which looked at the axial gap type rotary electric machine in Example 1 from the main-axis direction, and is a figure in case a through hole exists in one side surface. It is a schematic diagram showing the position of the through-hole which looked at the axial gap type rotary electric machine in Example 1 from the main-axis direction, and is a figure in case a through-hole exists in two opposing side surfaces. FIG. 2 is a schematic diagram showing the positions of through holes when the axial gap type rotating electrical machine in the first embodiment is viewed from the main axis direction, and is a view in the case where there are through holes at two locations on an upper surface and a side surface. It is a schematic diagram showing the position of the through-hole which looked at the axial gap type rotary electric machine in Example 1 from the main-axis direction, and is a figure in case a through-hole exists in two diagonal directions. FIG. 3 is a schematic diagram showing the positions of through holes when the axial gap type rotating electrical machine in the first embodiment is viewed from the main axis direction, and is a diagram in the case where there are through holes at three locations on the upper surface and the opposite side surfaces. FIG. 3 is a schematic diagram showing the positions of through holes when the axial gap type rotating electrical machine in the first embodiment is viewed from the main axis direction, and is a view in the case where there are through holes at three equal pitches on the side surface. FIG. 3 is a schematic diagram showing the position of a through hole when the axial gap type rotating electrical machine in the first embodiment is viewed from the main axis direction, and is a view when there is no terminal box. It is a schematic diagram which shows only the cross section of the one side with respect to the main axis | shaft of the structure which attached the through-hole cap to the through-hole of the axial gap type rotary electric machine in Example 2. FIG. It is a schematic diagram which shows only the cross section of the one side with respect to a main axis | shaft of the structure which attached the temperature sensor for housings to the through-hole cap of FIG. It is a schematic diagram which shows only the cross section of the one side with respect to a main axis | shaft of the structure which attached the temperature sensor for housing inside air to the through-hole cap of FIG. It is a schematic diagram which shows only the cross section of the one side with respect to a main axis | shaft of the structure which opened the through-hole to the through-hole cap of FIG. 16, and took out the sensor wire. It is a schematic diagram which shows only the cross section of the one side with respect to a main axis | shaft of the structure which used the through-hole of FIG. 16 as the screw hole, and attached the suspension bolt as a through-hole cap. It is a perspective view which shows the positional relationship of the stator, rotor, and housing of the conventional axial gap type rotary electric machine. It is a perspective view which shows the structure of the motor part of the conventional axial gap type rotary electric machine. It is a schematic diagram which shows only the cross section of the one side with respect to a main axis | shaft which shows the positional relationship of the stator of the conventional axial gap type rotary electric machine, a rotor, and a housing.

Hereinafter, embodiments to which the present invention is applied will be described with reference to the drawings.

First, an axial gap type rotating electrical machine that is a premise of the present invention will be described.

FIG. 21 is a perspective view showing a positional relationship among a stator, a rotor, and a housing of a conventional axial gap type rotating electrical machine. The configuration of the axial gap type rotating electrical machine includes a combination of 1 stator 1 rotor type, 1 stator 2 rotor type, 2 stator 1 rotor type, and the like. In this embodiment, a description will be given by taking a 1 stator 2 rotor type as an example. .

21, the housing 40 basically has a cylindrical shape extending in the main axis direction, but a cross-sectional view is shown for explanation. The stator 30 and the rotor 20 are arranged inside the cylinder of the housing 40. The stator 30 is disposed and fixed in the axial center portion of the housing 40, and the two rotors 20 are disposed so as to face the stator 30 and sandwich the stator 30 in the main shaft direction (not shown).

FIG. 22 is a perspective view showing the structure of the stator 30 and the rotor 20 of a conventional axial gap type rotating electrical machine. As shown in FIG. 22, the stator 30 includes an iron core 31, a bobbin 32, and a coil 33, and is filled with an insulating resin so as to fill a space between them, thereby forming an integral stator. The stator 30 is held by the housing 40 with an adhesive strength of insulating resin, and the housing 40 is configured so as not to come off in the axial direction of the stator 30 by providing a step on the inner side thereof, and a notch is partially cut in the rotational direction. The groove or protrusion is provided so that it does not rotate in the rotation direction. The rotor 20 includes a rotor yoke 22 and a permanent magnet 21.

FIG. 23 is a schematic diagram showing only a cross section on one side with respect to the main shaft 60, showing the positional relationship of the stator, rotor, and housing of a conventional axial gap type rotating electrical machine. In FIG. 23, a stator 30 composed of an iron core 31 and a coil 33 is filled with an insulating resin, molded with a mold 35, and fixed to a housing 40. Further, the two rotors 20 constituted by the rotor yoke 22 and the permanent magnet 21 are arranged so as to sandwich the stator 30 in the direction of the main shaft 60. The rotor 20 is rotatably held by a bearing 65 disposed on a bracket 50 coupled to the housing 40. Reference numeral 34 denotes a crossover wire drawn from the coil 33 of the stator 30, which is also filled with an insulating resin and is molded with a mold 35.

Here, when the stator 30 and the rotor 20 are assembled into the housing 40, it is necessary to adjust the air gap 25 between the rotor 20 and the stator 30, and a shim is inserted so as to be a distance calculated in advance. Although the assembly adjustment is performed, after the assembly, since the rotor 20 and the stator 30 are covered with the housing 40, there is a problem that the air gap cannot be visually confirmed after the assembly. Therefore, there is no way to check whether the air gap is normally formed after assembly, and there is a concern that the defect rate increases if it is defective.

Therefore, in the axial gap type rotating electric machine of the present embodiment, a through hole is provided in the housing 40 so that the air gap between the rotor 20 and the stator 30 can be seen through the through hole.

FIG. 1 is a schematic diagram showing only a cross section on one side with respect to the main shaft of the axial gap type rotating electrical machine in the present embodiment. In FIG. 1, the same components as those in FIG. 23 are denoted by the same reference numerals, and the description thereof is omitted. 1 is different from FIG. 23 in that a through hole 70 is provided in the housing 40. As shown in FIG. 1, the through hole 70 is located on the radial extension line of the air gap 25 between the rotor 20 and the stator 30, and is disposed on the housing 40 so that the air gap 25 can be seen. The through hole 70 is preferably arranged so as to be positioned directly above the air gap 25 in the main axis direction.

Further, in FIG. 1, there is only one through hole 70 in the direction of the main shaft 60, and only the air gap 25 between the right rotor 20 and the stator 30 on the paper surface of FIG. This is because there is a crossover 34 at the upper position of the air gap 25 between the rotor 20 and the stator 30 on the left side of FIG. is there. In addition, the connecting wire 34 is arranged so as to be distributed to the left and right in the circumference of the stator 30 on the paper surface, or the connecting wire 34 is arranged in the circumferential direction of the stator 30 so as not to protrude into the air gap 25 portion. If it comprises, the air gap 25 of the rotor 20 on either side can be visually observed by providing the two through-holes 70 in the direction of the main shaft 60.

FIG. 2 is a schematic diagram of the configuration viewed from the through hole of the axial gap type rotating electrical machine in the present embodiment. In FIG. 2, the through hole 70 has a circular shape, and preferably has a shape and size into which a gauge for measuring the air gap 25 can be inserted. The through hole 70 is preferably arranged so that the air gap 25 is positioned at the center of the through hole 70. By making it circular shape, there exists an effect that a process is easy.

FIG. 3 is a schematic view of a configuration viewed from the through hole of the axial gap type rotating electric machine in the present embodiment, and shows a case where the through hole shape is an ellipse. By making the through hole 70 an ellipse along the air gap 25, there is an effect that the air gap 25 can be listed over a wide range. Note that the same effect can be obtained by using a horizontally long rectangle in the longitudinal direction of the air gap as shown in FIG.

FIG. 5 is a schematic diagram of a configuration viewed from the through hole of the axial gap type rotating electric machine in the present embodiment, and shows a case where the through hole shape is rectangular. By making the through hole 70 a rectangle having two sides along the cross section of the rotor 20 and the stator 30, the air gap 25 is parallel, in other words, the rotor 20 is arranged in parallel to the stator 30. There is an effect that it can be confirmed visually. In addition, in the case of the same diameter compared to a circle, there is an effect that it is easy to see because the visible range is wide. It is also possible to check whether there are any abnormalities in the appearance of the rotor 20 and the stator 30.

FIG. 6 is a schematic diagram of a configuration viewed from the through hole of the axial gap type rotating electric machine in the present embodiment, and shows a case where the through hole shape is a vertically long ellipse. By making the through hole 70 an ellipse in a direction perpendicular to the longitudinal direction of the air gap 25, the housing can be shared even when the air gap position and the air gap length are changed by changing the configuration of the rotor / stator. Can do. Further, the same effect can be obtained even when a vertically long rectangle is used as shown in FIG.

Of course, in the present embodiment, the through hole is not limited to the shape shown in FIGS. 2 to 7, and may have a shape other than a circle or a rectangle as long as the side surface of the rotor / stator and the air gap length can be confirmed. For example, it may be an ellipse or polygon that is oblique to the axial direction.

FIG. 8 is a schematic diagram showing the position of the through hole 70 when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction. In FIG. 8, 45 is a housing leg, which has a terminal box 41 in the upper part of the axial gap type rotating electrical machine, and a through hole 70 is also provided in one upper part. By providing the through hole 70 in the upper part, there is an effect that it can be easily confirmed when the air gap 25 is visually observed through the through hole 70. Moreover, since the flow of a wind is interrupted by the terminal box 41 by arrange | positioning on the same surface as the terminal box 41, there exists an effect that dust etc. do not enter easily. In addition, even if the through-hole 70 is one place, it is possible to check the distortion on the rotor side by rotating the rotor.

FIG. 9 is a schematic diagram showing the position of the through hole 70 when the axial gap type rotating electric machine in the present embodiment is viewed from the main axis direction, and shows a case where the through hole 70 is provided at one side of the housing 40. 9 has an effect that the axial gap type rotating electrical machine can be thinned in the axial direction. Therefore, by providing the through hole 70 at a position different from the position of the terminal box 41, the feature that it can be thinned in the axial direction is utilized. Can do.

FIG. 10 is a schematic diagram showing the position of the through hole 70 when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction, and shows a case where there are through holes at two opposite side surfaces of the housing 40. In addition to having the same effect as in FIG. 9 in that the through hole 70 is provided at a position different from the position of the terminal box 41, and also having a plurality of through holes 70, a clearance gauge is used to form the back of the air gap 25. Can be confirmed. In addition, it is possible to confirm distortion on the stator side in addition to the rotor side by confirmation from the plurality of through holes 70.

FIG. 11 is a schematic diagram showing the positions of the through holes when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction, and shows a case where there are through holes at two locations on the upper surface and the side surface. In addition to the same effects as in FIGS. 8 and 9, the same effects as in FIG. 10 are obtained.

FIG. 12 is a schematic diagram showing the positions of through holes when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction, and is a diagram in the case where there are through holes in two diagonal directions. In addition to the same effect as in FIG. 11, there is an effect that it can be easily confirmed when viewing the air gap 25 through the through hole 70 from FIG. 11.

FIG. 13 is a schematic diagram showing the positions of the through holes when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction, and shows a case where there are through holes at three locations on the upper surface and the opposite side surfaces. Since the through-holes that can be observed compared to FIG. 11 are increased, it is possible to confirm the air gap 25 and the distortion on the stator side in a wider range.

FIG. 14 is a schematic diagram showing the positions of through holes when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction, and shows a case where there are through holes at three equal pitches on the side surface. Compared to FIG. 13, since there are through holes at an equal pitch, it is possible to check the air gap 25 and the distortion on the stator side in a wider range.

FIG. 15 is a schematic diagram showing the position of the through hole when the axial gap type rotating electrical machine in the present embodiment is viewed from the main axis direction, and shows an example in which there is no terminal box. The through holes 70 are not provided at an equal pitch, but are provided at a plurality of locations. As shown in FIGS. 8 to 15, the presence / absence of the terminal box and the position and number of the through holes 70 may be changed according to the situation where the motor is installed. Moreover, when providing two or more, it is not necessary to provide at equal pitch.

As described above, in this embodiment, the housing is provided with a through hole, and the air gap between the rotor and the stator can be seen through the through hole. Therefore, after the stator and the rotor are assembled in the housing, However, since the air gap can be visually confirmed, it can be confirmed whether the air gap is normally formed after assembly, and the defect rate can be reduced.

The present embodiment has a through hole cap that closes the through hole provided in the first embodiment, and describes a point that prevents intrusion of dust and foreign matters by closing the through hole in cases other than visual confirmation of the air gap. .

FIG. 16 is a schematic view showing only a cross section on one side with respect to the main shaft in a configuration in which a through-hole cap is attached to a through-hole of the axial gap type rotating electric machine in the present embodiment. In FIG. 16, the same components as those in FIG. 16 is different from FIG. 1 in that a through hole cap 74 is provided in the through hole 70. As shown in FIG. 12, by providing a through-hole cap 74 in the through-hole 70, the through-hole 70 is closed with the through-hole cap 74 in cases other than performing visual confirmation of the air gap through the through-hole 70. This prevents dust and foreign objects from entering. The through hole cap 74 may be metal or resin. If the through-hole cap 74 is a transparent member, the rotation state can be observed from the outside. It is also possible to detect rotation by providing a striped pattern on the circumferential surface of the rotor and monitoring with a sensor from the outside through the transparent member of the through-hole cap 74. It is also possible to detect rotation by providing a sensor in the through-hole cap 74 and monitoring with the sensor.

FIG. 17 is a schematic view showing only a cross section on one side with respect to the main shaft in a configuration in which a housing temperature sensor is attached to the through-hole cap 74 of FIG. In FIG. 17, by providing the housing temperature sensor 75 in the through-hole cap 74, there is no need to separately provide a mounting seat for the housing temperature sensor 75. If a separate mounting seat is provided in the axial direction, the shaft length increases. When provided in the radial direction, the magnetic pole radial direction is reduced with respect to the same radial dimension without the mounting seat, so that the problem that the magnetic pole area is reduced and the output is reduced can be solved. Also, there is an effect that removal is easy.

FIG. 18 is a schematic view showing only a cross section on one side with respect to the main shaft in a configuration in which a temperature sensor for housing inside air is attached to the through-hole cap 74 of FIG. In FIG. 18, by providing the inside air temperature sensor 76 in the through-hole cap 74, there is no need to separately provide a mounting seat for the inside air temperature sensor 76, and as in FIG. It can be solved and has the effect of being easy to remove.

Alternatively, instead of the inside air temperature sensor 76, a magnetic pole position detection sensor, a rotation detection sensor, or a position detection sensor may be attached to detect rotation.

FIG. 19 is a schematic diagram showing only a cross section on one side with respect to the main shaft in a configuration in which a through hole is provided in the through hole cap of FIG. 16 and a sensor wire 78 is taken out. In FIG. 19, a sensor wire 78 from a sensor such as a thermocouple attached to the stator 30 is taken out from a through hole of a through hole cap / lead wire bush 77 provided with a through hole. Thereby, there is an effect that it is not necessary to separately provide a hole for taking out the sensor wire 78.

FIG. 20 is a schematic view showing only a cross section on one side with respect to the main shaft in a configuration in which the through hole 70 of FIG. 16 is a screw hole and a suspension bolt 79 is attached as a through hole cap. In FIG. 20, the combined use of the through hole cap and the suspension bolt 79 has an effect that it is not necessary to separately provide a suspension bolt.

Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, although the above-described embodiment has been described by taking an example of a 1-stator 2-rotor type axial gap type rotating electrical machine, it is obvious that the 1-stator 1-rotor type and 2-stator 1-rotor type can also be applied. Moreover, it is possible to replace a part of the configuration of a certain embodiment with the configuration of another embodiment. For example, the configuration shown in FIGS. 2 to 7 may be replaced with through holes having different shapes. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

20: Rotor, 21: Permanent magnet, 22: Rotor yoke, 25: Air gap, 30: Stator, 31: Iron core, 32: Bobbin, 33: Coil, 34: Crossover, 35: Mold, 40: Housing, 41: Terminal Box, 45: Housing leg, 50: Bracket, 60: Main shaft, 65: Bearing, 70: Through hole, 74: Through hole cap, 75, 76: Temperature sensor, 77: Bush for through hole cap and lead wire, 78: Sensor wire 79: Suspension bolt

Claims

A rotor that rotates about a main shaft;
A stator disposed facing the rotor in the main axis direction;
A housing for fixing the stator;
A bracket coupled to the housing and holding a bearing and the rotor being rotatably held;
An axial gap type rotating electrical machine characterized in that the rotor and the stator are disposed inside the housing, and the housing has a through hole located on a radial extension line of an air gap between the rotor and the stator. .
The axial gap type rotating electrical machine according to claim 1,
The axial gap type rotating electrical machine is characterized in that the through hole is circular and has a size into which a gauge for measuring the air gap can be inserted.
The axial gap type rotating electrical machine according to claim 1,
The housing has a cylindrical shape extending in the main axis direction,
When the housing leg side provided in the housing is the lower part of the housing, it has a terminal box on the upper part of the housing,
An axial gap type rotating electrical machine characterized in that the position of the through hole on the housing is the position of the terminal box as viewed from the main axis direction.
The axial gap type rotating electrical machine according to claim 1,
The housing has a cylindrical shape extending in the main axis direction,
An axial gap type rotating electrical machine characterized in that when the housing leg side provided in the housing is the lower part of the housing, the position of the through hole on the housing is the side surface of the housing when viewed from the main axis direction.
The axial gap type rotating electrical machine according to claim 1,
The housing has a cylindrical shape extending in the main axis direction,
When the housing leg side provided in the housing is the lower part of the housing, it has a terminal box on the upper part of the housing,
An axial gap type rotating electrical machine characterized in that the position of the through hole on the housing is shifted from the position of the terminal box when viewed from the main axis direction.
An axial gap type rotating electrical machine according to claim 4,
An axial gap type rotating electrical machine characterized in that the positions of the through holes on the housing are two opposite side surfaces of the housing when viewed from the main axis direction.
The axial gap type rotating electrical machine according to claim 1,
The housing has a cylindrical shape extending in the main axis direction,
When the housing leg side provided in the housing is the lower part of the housing, the positions of the through holes on the housing are three places at equal pitches on the side surface of the housing when viewed from the main axis direction. Axial gap type rotating electrical machine.
The axial gap type rotating electrical machine according to claim 1,
An axial gap type rotating electric machine, wherein a through hole cap is attached to the through hole.
An axial gap type rotating electrical machine according to claim 8,
An axial gap type rotating electrical machine, wherein a housing temperature sensor or an inside air temperature sensor is attached to the through hole cap.
An axial gap type rotating electrical machine according to claim 8,
An axial gap type rotating electrical machine characterized in that a through hole is provided in the through hole cap and a sensor wire is taken out.
The axial gap type rotating electrical machine according to claim 1,
An axial gap type rotating electrical machine characterized in that the through hole is a screw hole and a suspension bolt is attached to the screw hole.
An axial gap type rotating electrical machine according to claim 8,
The axial gap type rotating electrical machine, wherein the through hole cap is a transparent member.