JP2010088166A - Axial air gap electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide axial air gap electric motors different in a skew angle using one kind of pole member. <P>SOLUTION: In each axial air gap electric motor, a stator and a rotor are placed along the direction of the rotation axis line of the rotor with a predetermined gap in between opposite to each other. The stator includes multiple pole members 22a to 22i annularly arranged with the rotation axis line at the center. Each of the pole members 22a to 22i includes a tooth having a tooth surface 51 formed by laminating electromagnetic steel plates; an insulator so formed that it covers the tooth except the tooth surface 51; and a coil wound on the insulator. The pole members 22a to 22i are respectively rotated with lines parallel with the rotation axis line, respectively corresponding to the pole members 22a to 22i, taken as central axes O'a to O'i and each tooth surface 51 is thereby provided with the skew angle θ. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator for an axial air gap type electric motor.

  Conventionally, reduction of vibration and noise of an electric motor has been demanded, and an electric motor having a skew angle in an iron core is known as one of methods for reducing cogging torque and torque ripple that cause vibration and noise. Yes. As such an electric motor, as shown in FIGS. 10 (a) and 10 (b), an annular yoke 100 and a plurality of teeth 102 are formed radially at intervals in the circumferential direction as a winding groove. In a radial gap type electric motor provided with a stator 103 and a rotor 104 that is opposed to the stator 103 with a predetermined gap and generates a magnetic field by a permanent magnet 105 embedded in a rotor core, There is one in which the rotor 104 is divided into a plurality of blocks 106 in the axial direction, and the blocks 106 of the rotor 104 are stacked while being shifted in the circumferential direction (see, for example, Patent Document 1).

  The radial gap type electric motor of Patent Document 1 is a rotor 104 having a permanent magnet 105, and one magnetic pole is divided into a plurality of blocks 106 and shifted, and one whole magnetic pole is inclined. Is different.

  On the other hand, as an electric motor for inclining one whole magnetic pole as a stator core, an axial air gap type electric motor including an annular stator and a pair of disk-like rotors arranged opposite to each other with a predetermined gap on both sides of the stator 11 (a) to 11 (c), a plurality of teeth (stator cores) 108 constituting the stator are arranged in a ring shape, and the tooth surfaces of the teeth 108 face each other. Some 108b and 108c are provided with a portion 111 inclined by a predetermined skew angle θ with respect to the radial direction of the rotor (see, for example, Patent Document 2).

  This axial air gap type electric motor of Patent Document 2 has a laminated structure in which each tooth 108 is laminated with a plurality of electromagnetic steel plates 108a along the radial direction of the rotor, and from the center side to the outside in order to increase the driving torque. A substantially trapezoidal tooth surface that gradually increases in width in the circumferential direction is formed to increase the area of the tooth surface that faces the permanent magnet provided in the rotor.

  In the axial air gap type electric motor, a method of laminating the electromagnetic steel sheets 108a one by one was used to form the portion 111 inclined on the tooth surface by a predetermined skew angle θ. In this case, when changing the skew angle θ to the tooth surface in accordance with the application of the axial air gap type electric motor, the electromagnetic steel sheets 108a must be changed one by one and shifted and laminated.

For this reason, when configuring a stator of a different axial air gap type motor, an insulator is formed so as to cover the tooth 108 except for a tooth surface of the tooth 108, and a coil is wound around the insulator to form a pole member. However, there is a disadvantage that a dedicated pole member corresponding to the skew angle θ is required.
Japanese Patent Laid-Open No. 2006-60952 (pages 5 to 6, FIG. 1) Japanese Patent Laying-Open No. 2005-185075 (pages 5-7, FIG. 3)

  In view of the above problems, an object of the present invention is to provide an axial air gap type electric motor having different skew angles by using one kind of pole member.

  In order to solve the above-mentioned problems, the present invention is characterized in that the stator and the rotor are arranged to face each other with a predetermined gap along the rotation axis direction of the rotor, and the stator is centered on the rotation axis. A plurality of pole members arranged annularly, and a tooth having a tooth surface formed by laminating electromagnetic steel plates, and an insulator formed so as to cover the teeth except for the tooth surface And an axial air gap type electric motor having a coil wound around the insulator, wherein each of the pole members is rotated about a line parallel to the rotation axis corresponding to each of the pole members. Therefore, a skew angle is provided on the tooth surface. .

  According to a second aspect of the present invention, in the axial air gap type electric motor according to the first aspect of the present invention, a connecting means is provided for connecting the plurality of pole members in a ring shape with a skew angle provided on the tooth surface. It has a characteristic configuration.

  According to a third aspect of the present invention, in the axial air gap type electric motor according to the first aspect, the stator is integrally formed of a resin with a molding die in a state where the pole members are arranged in an annular shape. The member is provided with positioning means for disposing in the mold with a skew angle provided on the tooth surface.

  According to a fourth aspect of the present invention, there is provided a plurality of pole members in which the stator and the rotor are arranged to face each other with a predetermined gap along the rotation axis direction of the rotor, and the stator is arranged in an annular shape around the rotation axis. A teeth member having a tooth surface formed by laminating electromagnetic steel plates, an insulator formed so as to cover the teeth excluding the tooth surface, and a coil wound around the insulator And an axial air gap type electric motor having a connecting means for connecting the pole members in an annular shape, wherein the connecting means comprises a plurality of recesses corresponding to skew angles. ing.

  According to the first aspect of the present invention, the skew angle is provided on the tooth surface by rotating each pole member around a line parallel to the rotation axis corresponding to each pole member as a central axis. Thereby, an axial air gap type motor having different skew angles can be manufactured using one kind of pole member.

  According to the second aspect of the present invention, the connecting means for connecting the plurality of pole members in a ring shape with the skew angle provided on the tooth surface is provided. Thereby, an axial air gap type electric motor having different skew angles can be manufactured regardless of the pole member shape.

  According to the third aspect of the present invention, the stator is integrally formed of resin with a molding die in a state where the pole members are arranged in an annular shape, and the pole members have a skew angle on the teeth surface. The positioning means for arranging in the mold in the provided state is provided. Thus, the same effect as that of the first aspect of the present invention can be obtained.

  According to the fourth aspect of the present invention, the pole member has a connecting means for connecting the pole members in a ring shape, and the connecting means has a plurality of recesses corresponding to the skew angle. Thus, the same effect as that of the first aspect of the present invention can be obtained.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a principal part showing the structure of an axial air gap type electric motor according to the present invention, FIG. 2 is a perspective view showing a pole member of the first embodiment, and FIG. 3 is an annular shape connecting the pole members of FIG. FIG. 4 is a perspective view showing the pole member of the second embodiment, and FIG. 5 uses the annular member of another embodiment that connects the pole members of FIG. 4 in an annular shape. It is a top view which shows the state which carried out.

  6 is a perspective view showing the pole member of the third embodiment, FIG. 7 is a plan view showing a state in which the pole members of FIG. 6 are connected in an annular shape, and FIG. 8 is an annular connection of the pole members in FIG. FIG. 9 is a perspective view showing a state in which the pole member of the fourth embodiment is placed in a mold.

  As shown in FIG. 1, an axial air gap type electric motor 1 according to the present invention includes a pair of annular stators 2 and a pair of air gaps that are opposed to each other with a predetermined gap on both sides of the stator 2 in the rotational axis direction of the rotor output shaft 6. Disc-shaped rotors 3 and 4 are provided. The stator 2 has a plurality of teeth (stator cores) 5 described later, and the rotors 3 and 4 have a plurality of (for example, 12) permanent magnets 31 and 41. The teeth 5 and the permanent magnets 31 and 41 are in a state of facing each other in the rotation axis direction of the rotor output shaft 6. The rotors 3 and 4 share the same rotor output shaft 6, and the stator 2 includes a bearing 7 that supports the rotor output shaft 6 on the inner peripheral side thereof. The stator 2 includes a stator core 22 in which a plurality of pole members 22a to 22i, which will be described later, in which the coil 21 is wound by insulating the teeth 5 are formed in an annular shape, and coaxially on the inner peripheral side of the stator core 22. The bearing 7 includes a pair of ball bearings 71 and 72 to be inserted, and these are integrally molded with the synthetic resin 23.

  In the axial air gap type motor 1 configured as described above, in order to reduce cogging torque and torque ripple that cause vibration and noise, the stator core 22 has a skew angle θ described later as shown in FIG. Is provided. Here, the cogging torque is a torque that acts due to the magnetic attractive force between the teeth 5 and the permanent magnets 31 and 41 when the rotors 3 and 4 are rotated when the axial air gap type motor 1 is not energized, and the torque ripple is This is a drive torque pulsation due to the rotation of the rotors 3 and 4 when the axial air gap type electric motor 1 is energized. The present invention is characterized by the configuration of the stator core 22 for providing the skew angle θ.

  Next, the stator core 22 of the first embodiment will be described. As shown in FIG. 3, the stator core 22 is configured by connecting a plurality of (for example, nine) pole members 22 a to 22 i in an annular shape. Each pole member 22a-22i is the same structure, and shows one pole member 22a in FIG. The pole member 22a is made of synthetic resin except for teeth (stator core) 5 formed by laminating a plurality of H-shaped electromagnetic steel plates in the radial direction and the upper and lower teeth surfaces 51 around the teeth 5. The formed insulator 24 and a coil (not shown) wound around the insulator 24 are provided. The shape of the tooth surface 51 is an isosceles trapezoid whose width in the circumferential direction gradually increases from the inner diameter side toward the outer diameter side.

  The insulator 24 is formed by insert molding in which the teeth 5 are placed in a cavity of a molding die (not shown) and molten resin is injected into the cavity. The teeth 5 may be integrally formed by powder molding or the like in addition to the lamination. The insulator 24 includes substantially fan-shaped flange portions 25, 25 arranged as a pair of upper and lower portions along the upper and lower teeth surfaces 51, and a neck portion 26 that connects the pair of flange portions 25, 25 to each other. Is formed in a bobbin shape having an H-shaped cross section. Further, the coil 21 is wound around the neck portion 26 of the insulator 24 as shown in FIG. 1, and electrical insulation between the coil 21 and the teeth 5 is maintained. In the same manner as the pole member 22a configured as described above, other pole members 22b to 22i are also formed.

  A cylindrical protrusion 251 for connecting the pole members 22a to 22i in an annular shape is formed on one flange portion 25 of each of the pole members 22a to 22i. The protrusions 251 are a pair of bosses that are integrally formed on the side surfaces that are flush with the teeth surface 51 on the inner and outer diameter sides of the flange portion 25. An annular member 8 formed in a disc ring shape made of synthetic resin or the like is attached to the protrusion 251. The annular member 8 includes an inner diameter side annular member 81 corresponding to the inner diameter side protrusion 251 of the flange portion 25, and an outer diameter side annular member 82 corresponding to the outer diameter side protrusion 251 of the flange portion 25. It has. Further, the inner diameter side annular member 81 and the outer diameter side annular member 82 are formed with engagement holes 811 and 821 that are engaged with the respective protrusions 251.

  Using the annular member 8, the inner diameter side and outer diameter side protrusions 251 of the pole members 22 a to 22 i are respectively connected to the engagement holes 811 of the inner diameter side annular member 81 and the outer diameter side annular member 82. , 821, each pole member 22 a to 22 i is connected in an annular shape. That is, the pole members 22a to 22i are connected in an annular shape when the connecting means including the annular member 8 and the protruding portion 251 are engaged. At this time, each pole member 22a to 22i has a center formed by a perpendicular line connecting the midpoint of the upper base and the midpoint of the lower base of the isosceles trapezoidal tooth surface 51 and a line perpendicular to the midpoint of the perpendicular line. The virtual central axes O′a to O′i passing through the points are connected to each other in a state where they are rotated by a predetermined angle.

  In this way, by rotating the respective pole members 22a to 22i around the virtual central axes O′a to O′i, the end point “a” on the inner diameter side and the end point “b” on the outer diameter side of the tooth surface 51 become the central axis O. It is possible to provide an angle θ (skew angle θ) formed with respect to. Here, the skew angle θ is an imaginary line L1 connecting the end point a on the inner diameter side of the tooth surface 51 and the central axis O, and a virtual line L2 connecting the end point b on the outer diameter side of the tooth surface 51 and the central axis O. Between the angles. These virtual center axes O′a to O′i are parallel to the rotor output shaft 6 on the same axis as the center axis O of the stator core 22 and rotate to rotate the pole members 22a to 22i, respectively. It is central.

  Each of the connected pole members 22a to 22i is aligned with the pole members 22a to 22i by an inner diameter side annular member 81 and an outer diameter side annular member 82, and a virtual central axis O ′ of each pole member 22a to 22i. Since they are connected in a state where they are rotated by a predetermined angle at a to O′i, as shown in FIG. 3, a skew angle θ can be provided on each tooth surface 51 in a lump.

  In other words, each of the pole members 22a to 22i includes the end points a and c on the inner diameter side of the adjacent tooth surfaces 51 of the respective pole members 22a to 22i and the outer diameter side of the adjacent tooth surfaces 51 of the respective pole members 22a to 22i. The end point b and the end point d are connected in a shifted state. Further, the skew angle θ is provided on the tooth surface 51 in the positive direction with respect to the rotation direction of the rotors 3 and 4 (arrow direction in FIG. 3). In this way, the stator core 22 after being connected in an annular shape by the connecting means comprising the annular member 8 and the protruding portion 251 and provided with the skew angle θ is integrated into the mold by pouring the synthetic resin into the mold. And the stator 2 is formed.

  According to the stator core 22 of the first embodiment configured as described above, an asymmetrical electrical steel sheet is used to form the skew angle θ on the tooth surface 51 as in the prior art of Patent Document 2. There is no need to stagger the layers. Therefore, a dedicated pole member corresponding to the skew angle θ is not required, and the pole member can be shared between the axial air gap type motors having different skew angles θ. That is, by preparing a plurality of sets of the annular members 8 according to the skew angle θ, the axial air gap type electric motor 1 having different skew angles θ can be manufactured using one kind of pole member.

  Further, in the stator core 22 of the first embodiment, a cylindrical projection 251 is formed on the flange portion 25 of the insulator 24, and fitting holes 811 and 821 corresponding to the projection 251 are formed on the annular member 8. However, conversely, the same effect can be obtained even when a fitting hole is formed in the flange portion 25 and a protrusion is formed in the annular member 8.

  Next, the stator core 22 of the second embodiment will be described. The description of the same configuration described in FIGS. 1 to 3 is omitted. As shown in FIGS. 4 and 5, in the stator core 22, a triangular prism-shaped protrusion 252 for connecting the pole members 22 a to 22 i in an annular shape is formed on one flange portion 25 of the pole members 22 a to 22 i. Is formed. Similar to the first embodiment, this protrusion 252 is also a pair of bosses integrally formed on the side surface that is flush with the tooth surface 51 on the inner diameter side and the outer diameter side of the flange portion 25, and in the outer diameter direction. It has the convex part 252a which sharpened toward. The annular member 8 also includes an inner diameter side annular member 81 corresponding to the inner diameter side protrusion 252 of the flange portion 25, and an outer diameter side annular member 82 corresponding to the outer diameter side protrusion 252 of the flange portion 25. It has. The inner diameter side annular member 81 and the outer diameter side annular member 82 are formed with engagement holes 812 and 822 in which the respective protrusions 252 are engaged. These engagement holes 812 and 822 have a plurality of recesses A to E and A ′ to E ′ corresponding to the skew angle θ, and the longitudinal directions of these engagement holes 812 and 822 are the pole members 22 a to It is formed in a circular arc shape centering on virtual center axes O′a to O′i passing through the center point of the tooth surface 51 of 22i.

  Using this annular member 8, the inner diameter side and outer diameter side protrusions 252 of the pole members 22a to 22i are respectively connected to the engagement holes 812 of the inner diameter side annular member 81 and the outer diameter side annular member 82, By engaging with 822, each pole member 22a to 22i is connected in an annular shape. That is, the pole members 22a to 22i are connected in an annular shape by the engagement of the connecting means including the annular member 8 and the protrusion 252. At this time, a plurality of recesses A to E, A having protrusions 252a in the protrusions 252 of one pole member 22a in the engagement holes 812, 822 of the inner diameter side annular member 81 and the outer diameter side annular member 82. By engaging with '~ E' by any combination and engaging the other pole members 22b to 22i with the same combination, as shown in FIG. Can be provided.

  In addition, each tooth surface 51 is appropriately changed by appropriately changing a combination in which the convex portion 252a included in the protruding portion 252 is engaged with the plurality of concave portions A to E and A ′ to E ′ included in the engagement holes 812 and 822. The skew angle θ can be changed. In this embodiment, as a combination to be engaged, when the convex portion 252a of the protrusion portion 252 on the inner diameter side and the outer diameter side is respectively engaged with the concave portion A and the concave portion A ′, the skew angle is 0 °. When the convex portion 252a is engaged with B and the concave portion B ′, the skew angle is 5 °, and when the convex portion 252a is engaged with the concave portion C and the concave portion C ′, the skew angle is 10 °, and the concave portion D is The skew angle can be set to 15 ° when the convex portion 252a is engaged with the concave portion D ′, and the skew angle can be set to 20 ° when the convex portion 252a is engaged with the concave portion E and the concave portion E ′. ing.

  In this way, the stator core 22 that is annularly connected by the connecting means including the annular member 8 and the protrusion 252 and has the skew angle θ is integrally formed of synthetic resin as in the first embodiment. The stator 2 is molded.

  According to the stator core 22 of the second embodiment configured as described above, the pole member can be shared between the axial air gap type motors having different skew angles θ, similarly to the stator core 22 of the first embodiment. Further, the connecting means can be shared. That is, unlike the stator core 22 of the first embodiment, a single type of pole member is used by one set of the annular members 8 without preparing a plurality of pairs of the annular members 8 according to the skew angle θ. Thus, the axial air gap type electric motor 1 having different skew angles θ can be manufactured.

  Further, in the stator core 22 of the second embodiment, a triangular columnar projection 252 is formed on the flange portion 25 of the insulator 24, and engagement holes 812 and 822 corresponding to the projection 252 are formed on the annular member 8. However, conversely, even if the engagement hole is formed in the flange portion 25 and the projection portion is formed in the annular member 8, the same effect can be obtained. Further, a triangular prism-shaped protrusion 252 having a sharp convex portion 252a is formed, and engagement holes 812 and 822 having a plurality of concave portions A to E and A ′ to E ′ that engage with the convex portion 252a are formed. However, the same effect can be obtained even when a projection having a projection other than a triangular prism shape and an engagement hole having a recess that can be engaged with the projection are formed. it can.

  Next, the stator core 22 of 3rd Embodiment is demonstrated. Note that the description of the same configuration described in FIGS. 1 to 5 is omitted. As shown in FIGS. 6 to 8, the stator core 22 is connected to flange portions 25, 25 arranged as a pair of upper and lower pole members 22 a to 22 i for annularly connecting the pole members 22 a to 22 i. A mating convex portion 253 and an engaging concave portion 254 are formed. The engagement convex part 253 is a convex part protruding outward from the end of the left side surface in the circumferential direction of each flange part 25, 25, and is formed in a triangular shape. On the other hand, the engagement recess 254 is a groove that is notched inward from the end portion of the right side surface in the circumferential direction of each flange portion 25, 25, and has a triangular shape in which the locking projection 253 matches. It consists of two formed recesses. The engaging convex portion 253 may be formed on the end portion on the right side surface, and the engaging concave portion 254 may be formed on the end portion on the left side surface, and if the respective pole members 22a to 22i can be connected in a ring shape, The convex portion 253 and the engaging concave portion 254 may be formed in other shapes such as a semicircular shape instead of the triangular shape.

  The positions at which the engaging convex portions 253 and the engaging concave portions 254 of the flange portions 25 and 25 are formed are such that when the pole members 22a to 22i are connected in an annular shape, the inner diameter side and the outer diameter of the ball members 22a to 22i. The end portions of the flange portions 25 on the side are designed so as to be located at positions shifted by a predetermined dimension as a whole. With this predetermined dimension, the skew angle θ can be provided on each tooth surface 51. Thus, as in the first embodiment, the end points on the inner diameter side and the outer diameter side of the adjacent tooth surfaces 51 are connected in an annular shape.

  By making the engaging convex part 253 and the engaging concave part 254 formed in this way match each other, the respective pole members 22a to 22i are connected in an annular shape. That is, the pole members 22a to 22i are connected in an annular shape by engaging the connecting means including the engaging convex portion 253 and the engaging concave portion 254. At this time, each tooth surface 51 is provided with a skew angle θ, and, as shown in FIGS. 7 and 8, of the two concave portions of the engaging concave portion 254, the engaging convex portion 253 is matched with the concave portion on the outer diameter side. Depending on whether or not the inner surface is matched with the recess on the inner diameter side, two skew angles θ can be provided on each tooth surface 51. In this embodiment, the skew angle can be set to 5 ° in the case of FIG. 7, and the skew angle can be set to 10 ° in the case of FIG. Further, if three triangular concave portions are provided as the engaging concave portion 254, three kinds of skew angles θ can be provided. In this way, the stator core 22 that is annularly connected by the connecting means including the engaging convex portion 253 and the engaging concave portion 254 and provided with the skew angle θ is integrated with synthetic resin in the same manner as in the first embodiment. The stator 2 is molded.

  According to the stator core 22 of the third embodiment configured as described above, the pole member can be shared between the axial air gap type motors having different skew angles θ, similarly to the stator core 22 of the first embodiment. Further, as in the stator core 22 of the first and second embodiments, the axial air gap type electric motor having different skew angles θ using one kind of pole member without preparing the annular member 8. 1 can be made.

  Further, in the stator core 22 of the third embodiment, a triangular groove is formed in the flange portion 25 as the engaging recess 254. However, the triangular shape is also cut out in the thickness direction of the flange portion 25. Even when the notch is formed, the same effect can be obtained.

  Next, the stator core 22 of 4th Embodiment is demonstrated. Note that the description of the same configuration described in FIGS. 1 to 8 is omitted. As shown in FIG. 9, the stator core 22 includes pole members 22 a to 22 i (partially shown) provided with positioning means for the mold 9 in a mold 9 for molding the stator 2. An assembly prototype of the stator core 22 is made by arranging the ring in an annular shape.

  The pair of flange portions 25, 25 of each pole member 22 a to 22 i is such that the tooth surface 51 of the tooth 5 is formed one step higher in the rotation axis direction of the rotor output shaft 6 than the insulator 24. A step is formed between the two. Therefore, the positioning means provided in each of the pole members 22a to 22i is a convex portion in which the tooth surface 51 protrudes from the flange portion 25 in the rotational axis direction by the height of the step.

  Further, a concave portion 91 that matches the convex portion formed by the tooth surface 51 is formed on the mating surface of the mold 9, and the concave portion 91 is in a state of being given a predetermined skew angle θ. Using each of these pole members 22a to 22i and the mold 9, the pole members 22a to 22i are annularly arranged by arranging the convex portions of the pole members 22a to 22i by the tooth surfaces 51 along the concave portions 91. Is positioned. In this way, the pole members 22a to 22i after being positioned in the annular shape are integrally molded with the synthetic resin injected into the mold 9 as in the first embodiment, and the stator 2 is molded. The

  According to the stator core 22 of the fourth embodiment configured as described above, the pole member can be shared between the axial air gap type motors having different skew angles θ, similarly to the stator core 22 of the first embodiment. That is, by preparing a plurality of molds 9 according to the skew angle θ, the axial air gap type electric motor 1 having different skew angles θ can be manufactured using one kind of pole member.

  Further, in the stator core 22 of the fourth embodiment, a convex portion is formed by the tooth surface 51 protruding from the flange portion 25 in the rotation axis direction, and a concave portion 91 that matches the convex portion is formed in the mold 9. However, like the protruding portion 251 shown in the first embodiment, a convex portion is formed from the flange portion 25, and a concave portion that matches the convex portion is formed in the mold 9, or a concave portion is formed in the flange portion 25. Even if the mold 9 is formed with a convex portion that matches the concave portion, the same effect can be obtained.

  In the stator core 22 of the embodiment described above, the teeth surfaces 51 provided on the teeth 5 included in the pole members 22a to 22i are formed in an isosceles trapezoidal shape so that the manufacture of each tooth 5 is facilitated. The invention is not limited to this, and the magnetic steel sheets are shifted and laminated one by one, and each pole member 22a to 22i provided with a portion inclined by a predetermined skew angle θ on the tooth surface 51 itself is a virtual central axis. You may rotate a predetermined angle centering | focusing on O'a-O'i, respectively.

  In the stator core 22 of the embodiment described above, the rotation centers for rotating the respective pole members 22a to 22i are virtual central axes O′a to O′i passing through the center point of the tooth surface 51. However, the present invention is not limited to this, and the central axes O′a to O′i may not pass through the center point of the tooth surface 51. For example, even if it exists in flange parts 25 other than the teeth surface 51, it may exist in the outer side of each pole member 22a-22i.

  Further, in the stator core 22 of the embodiment described above, the skew angle θ is provided in the positive direction with respect to the rotational direction of the rotors 3 and 4. However, the present invention is not limited to this, and the skew angle θ is not limited thereto. Even when the rotor is provided in the direction opposite to the rotation direction of the rotors 3 and 4, cogging torque and torque ripple can be reduced and vibration and noise of the axial air gap type motor can be suppressed.

It is principal part sectional drawing which shows the structure of the axial air gap type motor by this invention. It is a perspective view which shows the pole member of 1st Embodiment. It is a top view which shows the state which uses the cyclic | annular member which connects the pole member of FIG. 2 cyclically | annularly. It is a perspective view which shows the pole member of 2nd Embodiment. It is a top view which shows the state which uses the annular member of other embodiment which connects the pole member of FIG. 4 cyclically | annularly. It is a perspective view which shows the pole member of 3rd Embodiment. It is a top view which shows the state which connected the pole member of FIG. 6 cyclically | annularly. It is a top view which shows another state which connected the pole member of FIG. 6 cyclically | annularly. It is a perspective view which shows the state which put the pole member of 4th Embodiment in the mold die. It is explanatory drawing which shows the conventional radial gap type motor, (a) is a perspective view which shows an electric motor, (b) is a perspective view which shows a rotor. It is explanatory drawing which shows the conventional axial gap type electric motor, (a) is a partial top view which shows a stator core, (b) is an enlarged view which shows a stator core, (c) is a top view which shows an electromagnetic steel plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axial air gap type motor 2 Stator 21 Coil 22 Stator core 22a-22i Pole member O'a-O'i Central axis 23 Synthetic resin 24 Insulator 25 Flange part 251, 252 Projection part 252a Protrusion part 253 Engagement convex part 254 Engagement Concave portion 26 Neck portion 31 Permanent magnet 4 Rotor 41 Permanent magnet 5 Teeth 51 Teeth surface θ Skew angle 6 Rotor output shaft 7 Bearing 71, 72 Ball bearing 8 Annular member 81 Inner diameter side annular member 811, 812 Engagement holes A to E Recessed portion 82 Outer diameter side annular member 821, 822 Engaging hole A ′ to E ′ Recessed portion 9 Mold 91 Recessed portion (positioning means)

Claims (4)

  The stator and the rotor are arranged opposite to each other with a predetermined gap along the rotation axis direction of the rotor, the stator includes a plurality of pole members arranged in an annular shape around the rotation axis, and the pole members are electromagnetic Axial air comprising a tooth having a tooth surface formed by laminating steel plates, an insulator formed so as to cover the tooth except for the tooth surface, and a coil wound around the insulator In the gap type electric motor, the skew angle is provided on the teeth surface by rotating the pole member about a line parallel to the rotation axis corresponding to each of the pole members as a central axis. Air gap type electric motor.   2. The axial air gap type electric motor according to claim 1, further comprising a connecting means for connecting the plurality of pole members in a ring shape in a state where a skew angle is provided on the teeth surface.   The stator is integrally formed of resin with a molding die in a state where the pole member is arranged in an annular shape, and the pole member has a skew angle on the teeth surface, and the inside of the die is formed. 2. An axial air gap type electric motor according to claim 1, further comprising positioning means for disposing the motor in the axial air gap type. The stator and the rotor are arranged opposite to each other with a predetermined gap along the rotation axis direction of the rotor, the stator includes a plurality of pole members arranged in an annular shape around the rotation axis, and the pole members are electromagnetic A tooth having a tooth surface formed by laminating steel plates, an insulator formed so as to cover the tooth except for the tooth surface, a coil wound around the insulator, and the pole members annularly An axial air gap type electric motor comprising: a connecting means for connecting to an axial air gap type electric motor, wherein the connecting means includes a plurality of recesses corresponding to skew angles.

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