JP4400283B2 - Stator teeth structure of an axial gap type rotating electrical machine - Google Patents

Description

  The present invention is a member constituting a stator of an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are arranged so as to face each other along a rotation axis, and is used as a core for winding a coil around. This relates to the structure of the stator teeth.

2. Description of the Related Art Conventionally, axial gap motors in which at least a pair of stators and a rotor are disposed so as to face each other along a rotation axis are known in various configurations (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-187635

  FIG. 8 is a diagram showing a configuration of an example of a conventional axial gap type rotating electrical machine. In the example shown in FIG. 8, a rotor shaft 52 serving as a rotation shaft, a cylindrical rotor 53 fixed to the rotor shaft 52, and a stator 54 provided to face the rotor 53 are housed in a case 55. Thus, an axial gap motor 51 is configured. Here, the rotor shaft 52 is rotatably mounted on the case 55 via a bearing 56. The rotor 53 includes a rotor back core 57, a magnet 58, and a rotor core 59. Further, the stator 54 includes a stator yoke 60, a stator tooth 61 and a coil 62. A gap 63 is formed between the stator 54 and the rotor 53. In addition, 64 is an encoder for detecting the rotational position of the rotor shaft 52, and 65 is a cooling water passage for cooling the axial gap motor 51 provided in the case 55.

  FIGS. 9A and 9B are views showing an example of a stator structure of a conventional axial gap type rotating electrical machine. Here, FIG. 9A shows a plan view of the stator 54, and FIG. 9B shows a view of the arrow direction from the AA cross section in FIG. 9A. In the example shown in FIGS. 9A and 9B, a coil 62 (not shown here because the stator teeth are the subject of the present invention) should be wound on an annular stator yoke 60 having a rectangular cross section. The stator 54 is configured by fixing a plurality of rectangular parallelepiped stator teeth 61 at equal intervals in the circumferential direction.

  The stator teeth 61 need to be configured to pick up a large amount of magnetic flux in consideration of the shape, material, etc., but in the example shown in FIGS. 9A and 9B, the stator teeth 61 have a rectangular parallelepiped shape. In addition, the gap surface 61a facing the rotor has the same area as its cross section, and no means for picking up a large amount of magnetic flux in terms of shape has been taken. Therefore, there is a problem that necessary magnetic flux does not enter the stator teeth 61 and the output decreases.

  An object of the present invention is to solve the above-described problems, and to provide a stator teeth structure of an axial gap type rotating electrical machine that can pick up a large amount of magnetic flux and prevent a decrease in output.

A stator teeth structure of an axial gap type rotating electrical machine according to the present invention is a member that constitutes a stator of an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are arranged so as to face each other along a rotation axis. In the stator teeth used as a core for winding a coil, the teeth are configured from a teeth body and a teeth spreading portion provided at an end facing the rotor of the teeth body and having a surface wider than the ends of the teeth body. The teeth body is formed by laminating electromagnetic steel sheets in a direction perpendicular to the axial direction of the stator, and the teeth spreading portion is laminated with the electromagnetic steel sheets in the axial direction of the stator and the opening for fitting the end of the teeth body. A teeth expansion portion formed by providing a portion and an end portion of the teeth body fitted in the opening, In the main surface side of the electromagnetic steel plates constituting the body, the teeth enlarged portion constituting the tooth expanded portion, characterized in the provision of the non-magnetic portion made of a non-magnetic material so as to cut the tooth enlarged portion is there.

  According to the stator teeth structure of the axial gap type rotating electrical machine of the present invention, the stator teeth are provided on the teeth main body and the end of the teeth main body facing the rotor and have a wider surface than the end of the teeth main body. Since the teeth spreading part can pick up a lot of magnetic flux, the decrease in output can be prevented.

Further , according to the stator tooth structure of the axial gap type rotating electrical machine of the present invention, the tooth body is configured by stacking electromagnetic steel plates in a direction perpendicular to the axial direction of the stator, and the tooth spreading portion is electromagnetically disposed in the axial direction of the stator. While laminating steel plates, it can be configured from a tooth expansion portion formed by providing an opening for fitting the end of the teeth body and an end of the teeth body fitted to the opening. If comprised in this way, the stator teeth which have a stator spreading | diffusion part can be produced by the simple method of producing a teeth main body and a teeth expansion part separately, and fitting together. Further, the magnetic flux can pass through the magnetic steel plates on which the teeth main bodies are laminated and pass in the axial direction, and the passage of the magnetic flux in the axial direction is not hindered by providing the teeth expanding portion. In addition, the tooth expansion part formed by laminating electromagnetic steel sheets in the axial direction tends to generate eddy current because the surface of the magnetic steel sheet becomes a gap surface, but the tooth expansion part is provided only on the outer periphery of the tooth body, The area through which current flows can be reduced.

Further , according to the stator teeth structure of the axial gap type rotating electrical machine of the present invention, on the main surface side of the electromagnetic steel sheet constituting the teeth body , the teeth expanding portion is cut into the teeth expanding portion constituting the teeth spreading portion. A nonmagnetic portion made of a nonmagnetic material can be provided. If comprised in this way, the eddy current which flows into the teeth expansion part can be interrupted | blocked still more effectively. Further, since the tip portion of the stator teeth is quickly saturated, there is no deterioration in performance due to the provision of the non-magnetic material portion.

  Further, as a preferred example of the stator tooth structure of the axial gap type rotating electrical machine of the present invention, in the tooth spreading portion, the surface of the tooth expanding portion and the surface of the end portion of the tooth body exposed from the opening are the same surface. Can be configured. If comprised in this way, the stator teeth structure of this invention can be comprised more effectively.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a view for explaining an example of a stator teeth structure of an axial gap type rotating electric machine according to the present invention. In the example shown in FIG. 1, a tooth body 11 having a single-tooth shape and a rectangular parallelepiped shape of the present invention, and an end portion facing the rotor of the teeth body 11, has a surface wider than the end portion of the teeth body 11. Teeth spreading part 21 is comprised. In this example, a T-shaped plate-like electromagnetic steel sheet in which the teeth body 11 and the teeth spreading portion 21 are integrated is prepared, and the prepared electromagnetic steel sheets are stacked in a direction perpendicular to the axial direction of the stator. Stator teeth 1 are obtained.

  In the stator teeth 1 shown in FIG. 1, since the area of the surface facing the rotor can be increased by providing the tooth spreading portion 21 on the surface facing the rotor, a structure for picking up more magnetic flux than the conventional stator teeth can do. Further, since the lamination direction of the electromagnetic steel sheets is a direction perpendicular to the axial direction of the stator, the flow of magnetic flux that passes through the stator teeth and goes out to the rotor is not hindered.

  FIGS. 2A and 2B are views for explaining another example of the stator tooth structure of the axial gap type rotating electric machine according to the present invention. FIG. 2A shows a perspective view of the stator teeth 1, and FIG. 2B shows a plan view of the stator teeth 1. In the stator teeth 1 shown in FIGS. 2 (a) and 2 (b), a teeth expansion portion 23 having an opening 22 for fitting the end portion of the teeth main body 11 around the end portion of the rectangular parallelepiped teeth main body 11. Is fitted into the opening 22 of the teeth expanding portion 23 to form a teeth spreading portion 21 having a surface wider than the ends of the teeth main body 11. The teeth body 11 is formed by laminating plate-shaped electromagnetic steel plates in a direction perpendicular to the axial direction of the stator. Furthermore, the teeth expansion part 23 is configured by laminating plate-shaped electromagnetic steel sheets having openings 22 in the axial direction of the stator. And in the teeth spreading part 21, the surface of the teeth expansion part 23 and the surface of the edge part of the teeth main body 11 exposed from the opening part 22 become the same surface.

  In the stator teeth 1 shown in FIGS. 2A and 2B, similarly to the example shown in FIG. 1, by providing the tooth spreading portion 21, a structure in which a large amount of magnetic flux is picked up can be obtained. In addition, by forming the teeth spreading portion 21 from the teeth main body 11 and the teeth expanding portion 23, the teeth spreading can be achieved by a simple method in which the teeth body 11 and the teeth expanding portion 23 are separately manufactured and fitted together. The stator teeth 1 having the portion 21 can be produced. Further, the magnetic flux can pass through the magnetic steel plates on which the teeth body 11 is laminated and pass in the axial direction, and by providing the teeth expanding portion 23, the passage of the magnetic flux in the axial direction is not hindered. Furthermore, the tooth expansion part 21 formed by laminating electromagnetic steel sheets in the axial direction has a structure in which the surface of the magnetic steel sheet becomes a gap surface and eddy currents are easily generated, but the tooth expansion part 21 is provided only on the outer periphery of the tooth main body 11. Therefore, the area where eddy current flows can be reduced.

FIGS. 3A and 3B are views for explaining still another example of the stator tooth structure of the axial gap type rotating electric machine according to the present invention. In the stator teeth 1 shown in FIGS. 3 (a) and 3 (b), similarly to the example shown in FIGS. 2 (a) and 2 (b), the teeth include the teeth body 11, the end of the teeth body 11, and the teeth expanding portion 23. In addition to the point constituted by the widened portion 21, a nonmagnetic body portion 24 is provided in the tooth expanded portion 23 so as to cut the tooth expanded portion 23. This non-magnetic part 24 needs to be provided on the main surface 11 a side of the electromagnetic steel sheet constituting the teeth body 11. As the nonmagnetic material constituting the nonmagnetic portion 24, aluminum, copper, or the like can be suitably used. In addition, the non-magnetic portion 24 can be formed of air, that is, cut into a gap shape, but in this case, the strength of the tooth expansion portion 23 is reduced.

  In the stator teeth 1 shown in FIGS. 3 (a) and 3 (b), in addition to the operational effects of the stator teeth 1 of the present invention shown in FIG. 1 and FIGS. 2 (a) and 2 (b) described above, The flowing eddy current can be blocked more effectively. In addition, since the tip portion of the teeth expansion portion 23 of the stator tooth 1 is saturated quickly, there is no deterioration in performance due to the provision of the nonmagnetic portion 24.

  FIGS. 4A and 4B are views for explaining still another example of the stator tooth structure of the axial gap type rotating electric machine according to the present invention. The examples shown in FIGS. 4A and 4B have basically the same structure as the examples shown in FIGS. 3A and 3B, and the same operational effects can be obtained. 4 (a) and 4 (b) is different from the example shown in FIGS. 3 (a) and 3 (b) in that the direction in which the electromagnetic steel sheets constituting the teeth body 22 are stacked is perpendicular to the axial direction. However, since the main surface 22a is different based on the difference in the lamination direction of the electromagnetic steel sheets, the position where the nonmagnetic body portion 24 of the tooth expansion portion 23 is provided is different.

  Comparing the stator teeth 2 provided with the teeth spreading portion 21 at the tip as in the present invention and the conventional example having no teeth spreading portion at the tip, the teeth magnetic flux when the teeth spreading portion 21 is set to 1 is shown in FIG. The teeth magnetic flux in the absence of the spread portion is about 0.7, and it can be seen that the teeth magnetic flux is significantly increased by the stator teeth 1 of the present invention. As a result, according to the present invention, the output of the axial gap type rotating electrical machine can be improved.

  In the present invention, it is also conceivable that the teeth expanding portion 23 constituting the teeth spreading portion 21 provided at the tip is integrally formed with iron powder instead of laminating electromagnetic steel sheets, but the teeth expanding portion 23 made of iron powder. Since the saturation magnetic flux density is low, the tip portion is saturated immediately, and the necessary magnetic flux does not enter the teeth, which is not preferable. In the present invention, the teeth body 11 may be configured by laminating electromagnetic steel plates in the axial direction. However, the surface facing the rotor is a single plate-like electromagnetic steel plate, which is preferable because eddy current increases. is not.

  FIG. 5 is a diagram for explaining an example of a process for manufacturing the stator structure of the present invention. The manufacturing process will be described with reference to FIG. 5. First, the teeth main body 11 and the teeth expanding portion 23 having the above-described configuration are prepared. At that time, the opening portion 22 of the teeth expanding portion 23 is fitted to both side surfaces perpendicular to the main surface 11a of the teeth main body 11 or both side surfaces parallel to the main surface 11a of the teeth main body 11 at the distal end portion of the teeth main body 11. A matching step 11s is provided. And the stator teeth 1 of this invention provided with the teeth expansion part 21 which provides the teeth expansion part 23 in the edge part of the teeth main body 11 by fitting and fixing the opening part 22 of the teeth expansion part 23 to the step part 11s. Can be manufactured. As shown in FIG. 6, these steps are the same even in an example in which the lamination directions of the electromagnetic steel sheets constituting the teeth body 11 are different by 90 degrees.

  Moreover, in the Example mentioned above, the surface of the axial direction of the stator teeth 1 was a rectangle, and the rectangular parallelepiped shape was demonstrated so that the lamination direction of an electromagnetic steel plate might show an example from which FIG. 7 (a), (b) respectively differs. However, the stator teeth structure of the present invention is not limited to this. For example, as shown in FIGS. 7C and 7D, the surface of the stator teeth 1 in the axial direction can be trapezoidal. In the case shown in FIGS. 7C and 7D, the stator teeth structure of the present invention can be obtained in the same manner as in the above-described example by matching the shape of the opening 22 of the tooth expanding portion 23 with the trapezoidal shape. it can. In the example shown in FIGS. 7A to 7D, the step portion 11s shown in FIGS. 5 and 6 is shown.

  The stator teeth structure of the axial gap type rotating electrical machine according to the present invention is preferably used for an application to improve the efficiency of the stator in an axial gap motor in which at least a pair of stators and a rotor are arranged to face each other along the rotation axis. be able to.

It is a figure for demonstrating an example of the stator teeth structure of the axial gap type rotary electric machine of this invention. (A), (b) is a figure for demonstrating the other example of the stator teeth structure of the axial gap type rotary electric machine of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of the stator teeth structure of the axial gap type rotary electric machine of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of the stator teeth structure of the axial gap type rotary electric machine of this invention, respectively. It is a figure for demonstrating an example of the process at the time of manufacturing the stator teeth structure of this invention. It is a figure for demonstrating the other example of the process at the time of manufacturing the stator teeth structure of this invention. (A)-(d) is a figure which shows the surface of the axial direction of the stator teeth in the stator teeth structure of this invention, respectively. It is a figure which shows the structure of an example of the conventional axial gap type rotary electric machine. (A), (b) is a figure which shows an example of the stator structure of the conventional axial gap type rotary electric machine, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator teeth 11 Teeth main body 11a Main surface 11s Step part 21 Teeth spreading part 22 Opening part 23 Teeth enlarged part 24 Nonmagnetic part

Claims (2)

In a stator tooth used as a core for winding a coil around a stator of an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are arranged to face each other along a rotation axis The teeth body, and a teeth spreading portion provided at an end facing the rotor of the teeth body and having a surface wider than the ends of the teeth body, and the teeth body is perpendicular to the axial direction of the stator. Teeth expansion part configured by laminating electromagnetic steel sheets, laminating the teeth spread part, laminating electromagnetic steel sheets in the axial direction of the stator, and providing an opening for fitting the end of the teeth main body, and this opening part The teeth spread part is formed on the main surface side of the electromagnetic steel sheet constituting the teeth body. Teeth in the enlarged portion, the stator teeth structure of an axial gap-type electrical motor, characterized in that a non-magnetic portion made of a non-magnetic material so as to cut the tooth enlarged portion that. 2. The stator of an axial gap type rotating electrical machine according to claim 1 , wherein in the teeth spreading portion, the surface of the teeth expanding portion and the surface of the end portion of the teeth body exposed from the opening are the same surface. Teeth structure.

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