JP2012044761A - Axial gap motor and method for manufacturing teeth for use in axial gap motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more simplify a configuration of a pressing machine for forming a plurality of plates comprised by a plurality of teeth that are annularly arranged in an axial gap motor.SOLUTION: Teeth (1) are composed of a laminate of a plurality of plates (2) whose widths gradually changing from a radially inner side of a back yoke toward a radially outer side. When the plurality of plates (2) are laminated, one widthwise side of each of the plates (2) is aligned with those of the rest of the plates (2).

Description

  The present invention relates to an axial gap type motor and a method for manufacturing teeth used in the axial gap type motor.

  Conventionally, an axial gap type motor including a rotor and a stator that are opposed from one end side and the other end side in the axial direction is known. The motor has a plurality of teeth extending from the end face of the stator and arranged in a ring around the shaft. A coil included in the stator is attached to the teeth.

  Patent Document 1 discloses a method for manufacturing a so-called laminated tooth, in which a plurality of plate materials having different width dimensions are laminated. This manufacturing method includes a pressing step and a laminating step. FIG. 9 is a diagram conceptually showing the pressing process.

  In this pressing step, in order to form a plurality of plate members having different width dimensions, a pair of molds opposed in the width direction are used as movable molds (30a, 30b). And the width dimension of a board | plate material is varied by adjusting the facing distance of these movable metal mold | die (30a, 30b).

  Specifically, the pair of movable molds (30a, 30b) and the fixed mold (31) located on the side of the pair of movable molds (30a, 30b) are simultaneously moved in the direction perpendicular to the plane of the electromagnetic steel sheet. The electromagnetic steel sheet is punched out. Thereby, the said board | plate material is formed. Thereafter, one movable mold (30a) moves along the surface direction toward the movable mold (30b) on the other end side at a predetermined pitch. The other movable mold (30b) moves along the surface direction toward the movable mold (30a) on one end side at a predetermined pitch. Then, the movable mold (30a, 30b) and the fixed mold (31) are simultaneously moved in the direction perpendicular to the plane of the electromagnetic steel sheet to punch out the electromagnetic steel sheet. Such an operation is repeated. Thereby, a plurality of plate materials having different width dimensions are formed.

  And in the said lamination process, the several board | plate material formed at the press process mentioned above is laminated | stacked in order of the thing with a long width dimension from the short thing along the lamination direction. By laminating in this way, teeth having a shape whose width dimension changes in the laminating direction of the plurality of plate members are formed. The teeth are arranged in such an orientation that the side with the shorter width dimension is positioned on the radially inner side of the stator and the side with the longer width dimension is positioned on the radially outer side of the stator.

  When the teeth are arranged in such a direction, the width of the teeth is increased outward in the radial direction of the stator. Thereby, the area of the end surface of the teeth can be increased, and the torque of the axial gap motor can be increased.

JP 2007-252064 A

  However, as described above, in order to form a plurality of plate members having different width dimensions, the pair of movable molds must be moved not only in the direction perpendicular to the plane but also in the plane direction. When such a plurality of movable molds are mounted on a press machine, each movable mold must be provided with a servo mechanism for moving in the direction perpendicular to the plane and moving in the plane direction. If it becomes like this, the structure of the said press will become complicated and is not preferable.

  The present invention has been made in view of this point, and an object of the present invention is to provide a press machine for forming a plurality of plate members constituting the teeth in an axial gap type motor having a plurality of teeth arranged in an annular shape. This is to make it possible to simplify the structure.

  According to a first aspect of the present invention, there is provided a rotor (12) having a drive shaft (11) fixed at the center thereof, and a stator (13) facing the rotor (12) in the axial direction of the drive shaft (11). And an axial gap type motor provided with a plurality of teeth (1) arranged at intervals in the circumferential direction of the drive shaft (11).

  The teeth (1) of the axial gap type motor are formed by laminating a plurality of plate members (2) whose width dimension gradually changes from the radially inner side to the outer side of the drive shaft (11). The side surface (4a) on one side in the width direction of the plate material (2) in the laminate is configured to be parallel to the lamination direction in which the plurality of plate materials (2) are laminated. It is a feature.

  Here, the width direction of the plate member (2) is a direction orthogonal to the axial direction of the drive shaft (11).

  In 1st invention, the said teeth (1) can be formed using the some board | plate material (2) formed by moving only one among a pair of metal mold | die in the conventional manufacturing method mentioned above. It becomes like this. Here, when one of the pair of molds is fixed and the other is moved to form the plate member (2), the shapes of the parts formed by the fixed mold are all the same. On the other hand, when the movable mold is moved away from the fixed mold, a wide plate is formed. When the movable mold approaches the fixed mold, a narrow plate (2) is formed. It is formed.

  And when laminating | stacking these board | plate materials (2) and forming teeth (1), the side surface of the part of the same shape formed with the metal mold | die on the fixed side is laminated | stacked. In addition, this teeth (1) is one laminated body which laminates | stacks several board | plate materials (2), and is not what united two laminated bodies which laminated | stacked several board | plate materials (2). . In addition, since the side surfaces of the same shape portion are aligned and stacked, the stacking direction is parallel to one of the two non-parallel side surfaces (4a, 4b) of the tooth (1).

  According to a second invention, in the first invention, a plurality of substantially fan-shaped permanent magnet portions (17) attached to the rotor (12) and arranged at intervals in the circumferential direction of the drive shaft (11). In the plan view, the permanent magnet portion (17) is formed in parallel with a first straight line (G) whose side surfaces (17a, 17b) extend radially outward from the center of the drive shaft (11). In addition, the first air gap (8) formed between two adjacent permanent magnet portions (17) is arranged so as to be symmetric with respect to the first straight line (G), and in plan view, The teeth (1) have side surfaces (4a, 4b) formed in parallel with a second straight line (D) extending radially outward from the center of the drive shaft (11), and two adjacent teeth ( 1) The second air gap (9) formed between the lines is symmetrical with respect to the second straight line (D). It is characterized by being disposed. Here, the plan view is a plan view from one end side or the other end side in the axial direction of the drive shaft (11).

  In the second invention, the first straight line (G) and the second straight line (D) are both straight lines extending radially outward from the center of the drive shaft (11). Then, the side surfaces (17a, 17b) of the permanent magnet portion (17) face each other across the first straight line (G), and the side surfaces (4a, 4b) of the teeth (1) sandwich the second straight line (D). ) Face each other. From this, when the rotor (12) and the stator (13) are viewed in plan from one axial end, the side surfaces (4a, 4b) of the teeth (1) and the permanent magnet portion (17) The side surfaces (17a, 17b) are parallel to each other.

  As described above, when the rotor (12) rotates, when the rotor (12) and the stator (13) are viewed in plan view from one axial end, the rotation period of the rotor (12) Accordingly, the side surfaces (4a, 4b) of the tooth (1) and the side surfaces (17a, 17b) of the permanent magnet part (17) are likely to overlap periodically.

  In a third aspect based on the second aspect, the first air gap (8) and the second air gap (9) are the same in the circumferential direction of the rotor (12) and the stator (13). It is characterized by having a width.

  In the third invention, the first air gap (8) and the second air gap (9) have the same width. As a result, when the rotor (12) rotates, the first air gap (8) and the first air gap (8) and the stator (13) when the rotor (12) and the stator (13) are viewed in plan from one axial end side. 2 The air gap (9) always matches with the rotation period of the rotor (12).

  Therefore, when the rotor (12) rotates, the first air gap (8) is sandwiched when the rotor (12) and the stator (13) are viewed in plan from one axial end side. The side surfaces (17a, 17b) of the facing permanent magnet portion (17) and the side surfaces (4a, 4b) of the teeth (1) facing each other across the second air gap (9) are the rotor ( It always matches according to the rotation cycle of 12).

  According to a fourth aspect of the present invention, there is provided a rotor (12) having a drive shaft (11) fixed at the center, and a stator (13) facing the rotor (12) in the axial direction of the drive shaft (11). And a manufacturing method for manufacturing an axial gap motor including a plurality of teeth (1) arranged at intervals in the circumferential direction of the drive shaft (11).

  In the above manufacturing method, a pressing step for punching a predetermined portion from the steel plate (22) to form two plate materials (2) and a plate material (2) formed from the steel plate (22) are laminated in the thickness direction. And forming the teeth (1), and arranging the teeth (1) at intervals in the circumferential direction of the drive shaft (11). The pressing step includes the steel plate (22 ) Between the pair of fixed molds (21a, 21b) and the pair of fixed molds (21a, 21b) having a predetermined interval in the surface direction of the steel plate (22) and movable in the plane direction of the steel plate (22) Using the movable mold (20), the pair of fixed molds (21a, 21b) and the movable mold (20) are simultaneously moved in the direction perpendicular to the plane of the plate (2), and a predetermined portion of the steel plate (22) Punching process, and after the punching process, move the movable mold (20) from one of the fixed molds (21a, 21b) to the other at a predetermined pitch The moving step is a step of alternately moving, and the laminating step is performed by aligning the positions of the sides on the fixed mold (21a, 21b) side of the plate material (2) formed by the pressing step (a plurality of plate materials ( 2) is a process of laminating.

  Here, the surface direction is a direction along the end surface of the steel plate (22), and the surface normal direction is a direction perpendicular to the end surface of the steel plate (22).

  In the fourth invention, a plurality of plate members (2) having different width dimensions can be formed by one movable mold (20) by the pressing step. Further, two plate members (2) can be formed in one punching process. Further, in the plurality of plate members (2) formed by the pressing step, the shapes of the portions formed by the fixed molds (21a, 21b) are all the same. And in the said lamination process, the several board | plate material (2) can be laminated | stacked by aligning the side of the part of this same shape.

  In the arrangement step, the teeth formed in the lamination step are arranged at intervals in the circumferential direction of the drive shaft (11).

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the arranging step is configured so that the teeth (1) are arranged so that the side surfaces (4a, 4b) are radially outward from the center of the drive shaft (11) in plan view. The second air gap (9) formed between two adjacent teeth (1) is symmetrical with respect to the second straight line (D), and is formed in parallel with the extending second straight line (D). It is characterized by arranging as follows.

  In the fifth invention, in the arrangement step, a plurality of second air gaps (9) formed between two adjacent teeth (1) are symmetrical with respect to the second straight line (D). The stator (13) with the teeth (1) can be manufactured.

  According to the present invention, the teeth (1) can be formed by laminating a plurality of plate members (2) formed by moving only one of a pair of molds used in the conventional manufacturing method. In this way, when the plate material (2) is formed, only one movable mold (20) needs to be moved. Thereby, the structure of the press machine for forming the plurality of plate members (2) can be further simplified.

  According to the second aspect of the invention, when the axial gap type motor (10) is activated, the rotor (12) rotates around the drive shaft (11) and the drive shaft (11). When the stator (13) that does not rotate in plan view from one axial end, the side surface (4a, 4b) of the tooth (1) and the permanent magnet portion according to the rotation period of the rotor (12) The side surfaces (17a, 17b) of (17) tend to overlap periodically. Thereby, it is possible to easily suppress a short circuit of magnetic flux generated between the tooth (1) and the permanent magnet portion (17).

  According to the third aspect of the invention, when the axial gap type motor (10) is activated, the rotor (12) rotating around the drive shaft (11) and the drive shaft (11) When the stator (13) that does not rotate in plan view from one axial end side, both side surfaces (4a, 4b) of the teeth (1) and the permanent magnets according to the rotation period of the rotor (12) Both side surfaces (17a, 17b) of the portion (17) periodically overlap. Thereby, the short circuit of the magnetic flux produced between the said teeth (1) and the said permanent magnet part (17) can be suppressed.

Moreover, according to the said 4th invention, the several board | plate material (2) from which a width dimension differs by one movable metal mold | die (20) can be formed according to the said press process. Thereby, the structure of the press machine which forms the some board | plate material (2) which comprises the said teeth (1) can be simplified.
In addition, the plurality of plate members (2) formed by the pressing process have the same shape in the portions formed by the fixed molds (21a, 21b). And in the said lamination process, the several board | plate material (2) can be laminated | stacked by aligning the side of the part of this same shape. As described above, the side of the plate (2) formed by the pressing process on the side of the fixed mold (21a, 21b) can be aligned, which makes it easier to stack a plurality of plates than in the past. it can.

  According to the fifth aspect of the invention, the second air gap (9) formed between the two adjacent teeth (1) by the arrangement step is symmetrical with respect to the second straight line (D). Thus, a stator (13) having a plurality of teeth (1) arranged can be manufactured. Thereby, for example, in the rotor (12) corresponding to the stator (13), the first air gap (8) formed between the two adjacent permanent magnet portions (17) is the first straight line (G ) Is arranged so as to be line symmetric with respect to.

  In this case, the side surfaces (4a, 4b) of the teeth (1) and the side surfaces (17a, 17b) of the permanent magnet portion (17) are likely to overlap periodically according to the rotation period of the rotor (12). Become. Thereby, it is possible to easily suppress a short circuit of magnetic flux generated between the tooth (1) and the permanent magnet portion (17).

It is a longitudinal section showing an important section of an axial gap type motor concerning an embodiment. It is a perspective view of the teeth of an axial gap type motor. It is a top view of the board | plate material which comprises a tooth | gear, (a) figure, (b) figure, (c) figure in order from the thing with the short width | variety dimension of a board | plate material. It is a cross-sectional view of the columnar part in teeth. It is an arrangement view of a plurality of teeth in an axial gap type motor. It is an arrangement view of a plurality of permanent magnets in an axial gap type motor. It is the figure which showed notionally the press process in the manufacturing method of an axial gap type motor. It is an arrangement view of a plurality of permanent magnets and a plurality of teeth according to another embodiment, (a) is an arrangement of teeth and (b) is an arrangement of permanent magnets. It is the figure which showed notionally the conventional press process in the manufacturing method of an axial gap type motor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The axial gap motor according to the present embodiment is, for example, housed together with a compression mechanism in a casing of a hermetic compressor used in a refrigeration apparatus, and drives the compression mechanism. ) Includes a rotor (12) having a drive shaft (11) fixed at the center, as shown in FIG. A plurality of substantially fan-shaped permanent magnet portions (17) are attached to the rotor (12). The permanent magnet portion (17) has a plate-like permanent magnet body (18a) and a plate-like magnetic body (18b). The magnetic body (18b) is positioned above the permanent magnet body (18a), and the permanent magnet body (18a) and the magnetic body (18b) are in contact with each other back to back.

  On the upper side of the rotor (12), an upper stator (stator) (13) is arranged coaxially with the drive shaft (11) at a predetermined interval. The upper stator (13) has a disk-shaped back yoke (15) having an opening at the center. A reinforcing plate (19) having the same diameter as that of the back yoke (15) is attached to the upper end surface of the back yoke (15). A plurality of teeth (1) extend from the lower end surface of the back yoke (15). This tooth (1) is a laminated body formed by laminating a plurality of plate materials (2) in the thickness direction of the plate material (2).

  And the said teeth (1) is arrange | positioned so that the lamination direction which laminates | stacks several board | plate materials (2) may correspond along the radial direction of the said back yoke (15). The lower end surface of the tooth (1) faces the upper end surface of the permanent magnet portion (17) of the rotor (12).

  A lower stator (14) is disposed coaxially with the drive shaft (11) at a predetermined interval below the rotor (12).

<Teeth>
As shown in FIG. 2, the tooth (1) is a laminate in which a plurality of plate materials (2) are laminated in the thickness direction of the plate material (2) (the arrow direction in FIG. 2). In FIG. 2, the thickness of each plate member (2) is exaggerated. Some of the plurality of plate members (2) have different shapes. The board | plate material (2) from which the shape differs is shown to Fig.3 (a)-(c). Each plate (2) has a shape in which a part of both side portions (3a, 3b) in the width direction is cut out in a rectangular shape. Each plate member (2) has a different width dimension (A) in FIG. Further, each plate (2) has the same shape on the left side of the plate (2). Note that the teeth (1) are not formed only by the three sheets (2) in FIG. 3, but a large number of sheets (2) having different width dimensions are laminated to form the teeth (1). ing.

  And the said teeth (1) are formed by laminating | stacking these several board | plate materials (2) so that a width dimension may change gradually in the thickness direction. Specifically, a predetermined number of the plate materials (2) are stacked in the order from the shortest to the longest in the stacking direction (B portion in FIG. 2), and then from the longest to the shortest. Then, the plate material (2) is laminated (C portion in FIG. 2).

  Thus, the tooth (1) formed by laminating a plurality of plate members (2) has a columnar portion (4) having a substantially polygonal cross-sectional shape. In this embodiment, the cross-sectional shape of the columnar part (4) is a pentagon as shown in FIG. As shown in FIG. 2, a thin plate-like upper end portion (5) is connected to the upper end surface of the columnar portion (4). The cross-sectional shape of the upper end (5) is a pentagon. Further, a thick plate-like lower end portion (6) is connected to the lower end of the columnar portion (4). The cross-sectional shape of the lower end (6) is substantially rectangular. Furthermore, the protrusion part (7) protrudes from the lower end surface of the said lower end part (6).

  The back yoke (15) has an opening (not shown) for fitting the lower end (6). Although not shown, a reinforcing plate (19) is attached to the end surface of the back yoke (15) opposite to the teeth (1). The reinforcing plate (19) has an elongated hole for inserting and fixing the protruding portion (7). The teeth (1) are fixed so as to extend from the lower end surface of the back yoke (15) by the opening of the back yoke (15) and the long holes of the reinforcing plate (19).

  Here, as shown in FIG. 4, the columnar part (4) has a left side surface (4a) and a right side surface (4b) which are not parallel to each other. And the lamination direction which laminates | stacks several board | plate material (2) is parallel to the said left side surface (4a). This is because the shape of the left side of each plate (2) is the same, and the left sides of the plurality of plates (2) are aligned and stacked.

  The side surface of the columnar part (4) is covered with an insulator (not shown). A conductive wire is wound around the side surface via the insulator. The group of the conductive wires constitutes the coil (16) of the stator.

<Arrangement of teeth and permanent magnets>
FIG. 5 is a layout view of a plurality of teeth (1) arranged on the end face of the back yoke (15). In addition, the shape of the tooth (1) of FIG. 5 is a cross-sectional shape of the columnar part (4) in the tooth (1). As shown in FIG. 5, the plurality of teeth (1) are arranged in an annular shape at equal intervals in the circumferential direction of the drive shaft (11). The teeth (1) arranged in this way are arranged in such a manner that the width dimension of each plate member (2) gradually changes from the radially inner side to the outer side of the back yoke (15). It is attached to (13). The shape of the right side surface (4b) of the tooth (1) is determined according to the amount of change in the width dimension. The larger the change in the width dimension is, the more the right side surface (4b) of the tooth (1) is in the left side surface (4a) of the tooth (1) in plan view from one end side of the drive shaft (11). ).

  A second air gap (9) is formed between adjacent teeth (1) and teeth (1). In plan view from one end of the drive shaft (11), the center line of the second air gap (9) constitutes a second straight line (D) extending radially outward from the center of the drive shaft (11). To do. And when arrange | positioning the said tooth | gear (1), it is made for the side surface (4a, 4b) of this tooth | gear (1) to become parallel to the said 2nd straight line (D). As a result, the side surfaces (4a, 4b) of the tooth (1) are positioned on both sides of the second straight line (D) in parallel with the second straight line (D).

  As described above, since the second straight line (D) is the center line of the second air gap (9), the second straight line (D) and the right side surface (4b) of the tooth (1). And the distance (L) between the second straight line (D) and the left side surface (4a) of the teeth (1) have the same length. That is, the second air gap (9) is positioned so as to be line symmetric with respect to the second straight line (D).

  FIG. 6 is a layout diagram of a plurality of permanent magnet portions (17) arranged on the end face of the rotor (12). As shown in FIG. 6, the plurality of permanent magnet portions (17) are arranged in an annular shape at equal intervals in the circumferential direction of the drive shaft (11). And between a neighboring permanent magnet part (17) and a permanent magnet part (17) comprises a 1st air gap (8). In plan view from one end of the drive shaft (11), the center line of the first air gap (8) constitutes a first straight line (G) extending radially outward from the center of the drive shaft (11). To do. And when arrange | positioning the said permanent magnet part (17), it is made for the side surface (17a, 17b) of this permanent magnet part (17) to be parallel to the said 1st straight line (G). Thus, the side surfaces (17a, 17b) of the permanent magnet portion (17) are positioned on both sides of the first straight line (G) in parallel with the first straight line (G).

  As described above, since the first straight line (G) is the center line of the first air gap (8), the first straight line (G) and the right side surface of the permanent magnet part (17) ( The interval (L) of 17a) and the interval (L) of the first straight line (G) and the left side surface (17b) of the permanent magnet portion (17) have the same length. That is, the first air gap (8) is positioned so as to be line symmetric with respect to the first straight line (G).

  Here, the width of the first air gap (8) (the width along the circumferential direction of the rotor (12)) and the width of the second air gap (9) (the circumferential direction of the upper stator (13)). The width along the line is set to the same length. With this setting, when the rotor (12) is rotating, the rotor (12) and the upper stator (13) are viewed in plan view from one end in the axial direction. ), The both side surfaces (4a, 4b) of the tooth (1) and the both side surfaces (17a, 17b) of the permanent magnet portion (17) are periodically overlapped.

  In the present embodiment, the number (9) of the teeth (1) is different from the number (6) of the permanent magnet parts (17), and the shapes are different from each other. From this, it is considered that the both side surfaces (4a, 4b) of the tooth (1) and the both side surfaces (17a, 17b) of the permanent magnet portion (17) do not easily overlap periodically. However, by arranging the teeth (1) and the permanent magnet portions (17) as shown in the present embodiment, both side surfaces (4a, 4b) of the teeth (1) and the permanent magnet portions (17) are arranged. The both side surfaces (17a, 17b) of the slab overlap periodically.

<Manufacturing method of axial gap type motor>
Next, a manufacturing method of this axial gap type motor (10) will be described. This manufacturing method includes a pressing process, a laminating process, and an arranging process. FIG. 7 is a diagram conceptually showing the pressing step. In addition, this press process is performed with a press machine.

-Pressing process-
In the pressing process, a movable mold (20) and a fixed mold (21a, 21b, 21c) are used. Then, the electromagnetic steel plate (steel plate) (22) conveyed in one direction is pressed by the movable die (20) and the fixed die (21a, 21b, 21c), and the teeth (2) of the tooth (1) (2) ).

  Here, the movable mold (20) is movable in the width direction of the electromagnetic steel sheet (22). The fixed molds (21a, 21b, 21c) do not move in the width direction of the electromagnetic steel plate (22). Here, the width direction is a direction perpendicular to the conveying direction of the electromagnetic steel sheet (22).

  As shown in FIG. 7, the movable mold (20) is disposed near the center in the width direction of the electromagnetic steel sheet (22). The fixed molds (21a, 21b, 21c) are arranged in the vicinity of both sides in the width direction of the electromagnetic steel sheet (22) and on the side in the transport direction of the movable mold (20). That is, unlike the conventional case, there is only one movable mold (20).

  The pressing step will be described. First, the movable mold (20) moves to the left near the center of the electromagnetic steel sheet (22). When the movement of the movable mold (20) is completed, the movable mold (20) and the fixed mold (21a, 21b, 21c) are simultaneously moved in the direction perpendicular to the plane of the electromagnetic steel sheet (22), and the electromagnetic steel sheet (22) Punch out. As a result, two plate members (2a, 2b) arranged in the width direction are formed from the electromagnetic steel plate (22). This is the punching process of the pressing process.

  When this punching process is completed, the movable mold (20) moves to the right side at a predetermined pitch. This is the moving process of the pressing process. The electromagnetic steel sheet (22) is transported at a predetermined pitch in the transport direction described above together with the moving process. Then, the punching process is performed again. By this punching process, two plate materials (2a, 2b) arranged side by side are formed. After this punching process, the moving process is performed again. Thus, in the press process, the punching process and the moving process are alternately performed.

  Here, in this punching step, the fixed molds (21a, 21b) located on both sides of the electromagnetic steel plate (22) have the same shape, and the directions of each other are centered on the center line of the electromagnetic steel plate (22). Inverted. For this reason, in the said punching process, all the one side parts of the board | plate material (2) formed with these fixed metal mold | die (21a, 21b) become the same shape. That is, in all plate materials (2), the shape of the side on the fixed mold (21a, 21b) side in the plate material (2) is the same.

-Lamination process-
The lamination step is a step of forming the teeth (1) by laminating a plurality of plate materials (2) formed in the pressing step in the thickness direction. In this laminating step, as described above, after a predetermined number of plate materials (2) are laminated in the order from the shortest to the longest in the laminating direction, the plate materials (from the longest to the shortest) 2) Laminate.

  In this case, the side positions of the portions formed by the fixed molds (21a, 21b, 21c) in the plate members (2) are aligned. Here, two plate members (2) are formed by the pressing step. If one of the two plate members (2) is turned upside down, the fixed mold in each plate member (2) is formed. It becomes possible to align the positions of the side edges of the portion formed by (21a, 21b, 21c). By laminating in this way, the cross-sectional shape of the columnar part (4) in the tooth (1) can be made a pentagon, and the laminating direction in which a plurality of plate members (2) are laminated is the columnar part (4). Parallel to the left side (4a).

-Sequence process-
The arranging step is a step of arranging the teeth formed in the laminating step on the end surface of the back yoke (15) included in the stator (13) with an interval in the circumferential direction of the drive shaft (11). is there. In this arrangement step, as shown in FIG. 5, the plurality of teeth (1) are arranged in an annular shape at equal intervals in the circumferential direction of the drive shaft (11). Here, when arranging the plurality of teeth (1), the side surfaces (4a, 4b) of the teeth (1) are in the second straight line described above in plan view from one end side of the drive shaft (11). It is parallel to (D), and the distance between each side surface (4a, 4b) and the second straight line (D) is the same.

-Effect of the embodiment-
According to the present embodiment, the teeth (1) can be formed using a plurality of plate members (2) formed by moving only one of a pair of molds used in a conventional manufacturing method. it can. Thus, since only one movable mold (20) needs to be moved when forming the plurality of plate members (2), the structure of the press machine for forming the plurality of plate members (2) is as follows. Can be simplified.

  According to this embodiment, when the axial gap motor (10) is activated, the rotor (12) rotates around the drive shaft (11) and rotates around the drive shaft (11). When viewed from one end side in the axial direction of the stator that does not, the both sides (4a, 4b) of the teeth (1) and the permanent magnet portion (17) according to the rotation period of the rotor (12) Both side surfaces (17a, 17b) overlap periodically. Thereby, the short circuit of the magnetic flux produced between the said teeth (1) and the said permanent magnet part (17) can be suppressed.

  Further, according to the present embodiment, a plurality of plate members (2) having different width dimensions can be formed by one movable mold (20) by the pressing step. Thereby, the structure of the press machine which forms the some board | plate material (2) which comprises the said teeth (1) can be simplified.

  In the above-described laminating step, the non-parallel two side surfaces (4a, 4b) in the columnar portion (4) of the teeth (1) are arranged in the teeth (1) in the laminating direction in which the plurality of plate members (2) are laminated. The direction can be parallel to one of the two. In this laminating process, the side of the plate (2) formed by the pressing process on the side of the fixed mold (21a, 21b) can be aligned, making it easier to stack a plurality of plates as compared to the conventional method. Can do.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

  In the above-described embodiment, when the teeth (1) are formed, the plate members (2 in the order of the width dimension from the shortest to the longest from the radially inner side to the outer side of the back yoke (15). ) Are laminated in a predetermined number, and then the plate material (2) is laminated in the order from the longest to the smallest.

  However, the present invention is not limited to this. For example, the plate material (2) is laminated in the order of the width dimension from the shortest to the longest from the radially inner side to the outer side of the back yoke (15). May be. As a result, the width of the teeth (1) is increased outward in the radial direction of the back yoke (15).

  Thereby, the area of the end surface of the said tooth can be enlarged, and the torque of the said axial gap type motor can be enlarged similarly to embodiment mentioned above. In this case, the cross-sectional shape of the columnar portion (4) of the tooth (1) is a right-angled trapezoid.

  Further, according to the embodiment, the first air gap (8) on the rotor (12) side and the second air gap (9) on the upper stator (13) side are formed with the same width. However, the present invention is not limited to this, and the first air gap (8) may be wider than the second air gap (9) as shown in FIG. In FIG. 8, the first air gap (8) is wider than the second air gap (9). However, the second air gap (9) is wider than the first air gap (8). It may be wide.

  With this configuration, the rotor (12) that rotates around the drive shaft (11) and the stator that does not rotate around the drive shaft (11) when the axial gap motor (10) is activated. When viewed in plan from one axial end, the side surfaces (4a, 4b) of the teeth (1) and the side surfaces of the permanent magnet portion (17) according to the rotation period of the rotor (12) (17a, 17b) tends to overlap periodically. Thereby, it is possible to easily suppress a short circuit of magnetic flux generated between the tooth (1) and the permanent magnet portion (17).

  According to the above embodiment, the upper stator (13) is configured by fixing the lower end surfaces of the plurality of teeth (1) to the upper end surface of the annular back yoke (15). There is no need to be limited. For example, the upper stator (13) may be configured by molding a plurality of teeth (1) arranged in an annular shape with resin. Moreover, you may comprise an upper stator (13) by fixing the internal peripheral surface or outer peripheral surface of several teeth (1) arranged in a ring shape with a ring member.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for the teeth used in the axial gap motor and the method for manufacturing the teeth.

1 Teeth
2 Board material
4 Columnar part
5 Upper end
6 Bottom edge
7 Protrusion
10 Axial gap type motor
11 Drive shaft
12 Rotor
13 Upper stator (stator)
14 Lower stator
15 Back yoke
16 coils
20 Movable mold
21a, 21b, 21c Fixed mold

Claims (5)

A rotor (12) having a drive shaft (11) fixed at the center, a stator (13) facing the rotor (12) in the axial direction of the drive shaft (11), and the drive shaft ( 11) an axial gap type motor having a plurality of teeth (1) arranged at intervals in the circumferential direction,
The teeth (1) is a laminate formed by laminating a plurality of plate members (2) whose width dimension gradually changes from the radially inner side to the outer side of the drive shaft (11), Axial gap type motor characterized in that side surface (4a) on one side in width direction of plate material (2) in the laminate is parallel to the lamination direction in which a plurality of plate materials (2) are laminated. . In claim 1,
A plurality of substantially fan-shaped permanent magnet portions (17) attached to the rotor (12) and arranged at intervals in the circumferential direction of the drive shaft (11);
In plan view, the permanent magnet portion (17) is formed in parallel with a first straight line (G) whose side surfaces (17a, 17b) extend radially outward from the center of the drive shaft (11), The first air gap (8) formed between two adjacent permanent magnet parts (17) is arranged so as to be symmetric with respect to the first straight line (G),
In a plan view, the teeth (1) are adjacent to each other with their side surfaces (4a, 4b) parallel to a second straight line (D) extending radially outward from the center of the drive shaft (11). An axial gap type motor characterized in that a second air gap (9) formed between two teeth (1) is arranged so as to be symmetrical with respect to the second straight line (D). In claim 2,
The first air gap (8) and the second air gap (9) have the same width in the circumferential direction of the rotor (12) and the stator (13). Gap type motor. A rotor (12) having a drive shaft (11) fixed at the center, a stator (13) facing the rotor (12) in the axial direction of the drive shaft (11), and the drive shaft ( 11) A manufacturing method for manufacturing an axial gap type motor including a plurality of teeth (1) arranged at intervals in the circumferential direction,
A pressing step of punching a predetermined portion from the steel plate (22) to form two plate materials (2) arranged;
A laminating step of laminating the plate material (2) formed from the steel plate (22) in the thickness direction to form the teeth (1);
An arrangement step of arranging the teeth (1) at intervals in the circumferential direction of the drive shaft (11),
The pressing step is performed between the pair of fixed molds (21a, 21b) and the pair of fixed molds (21a, 21b) having a predetermined interval in the surface direction of the steel sheet (22). 22) using a movable mold (20) movable in the plane direction, and simultaneously moving the pair of fixed molds (21a, 21b) and movable mold (20) in the direction perpendicular to the plane of the plate (2). Punching a predetermined portion of the steel plate (22), and a moving step of moving the movable mold (20) from one of the fixed molds (21a, 21b) to the other at a predetermined pitch after the punching process. It is an alternate process,
The laminating step is a step of laminating a plurality of plate materials (2) by aligning the positions of the side edges of the plate material (2) formed by the pressing step on the fixed mold (21a, 21b) side. A manufacturing method of an axial gap type motor. In claim 4,
In the arranging step, the teeth (1) are formed in parallel with a second straight line (D) whose side surfaces (4a, 4b) extend radially outward from the center of the drive shaft (11) in plan view. And an axial gap type characterized in that the second air gap (9) formed between two adjacent teeth (1) is arranged symmetrically with respect to the second straight line (D). A method for manufacturing a motor.

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