JP2008131809A - Split core for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a split core for motor in which magnetic flux flows easily from a teeth to a yoke. <P>SOLUTION: The split core 10 comprises a columnar tees 11, and a yoke 12 provided over the entire circumference of the teeth 11 while projecting. Assuming the angle made by the coil end face 11e of the teeth 11 and the end intersection face 12<SB>fe</SB>continuous to the coil end face 11e of the teeth 11 in the yoke 12 is a core side angle θ<SB>e</SB>, the core side angle θ<SB>e</SB>is an obtuse angle. Since the core side angle θ<SB>e</SB>is an obtuse angle, magnetic flux flows easily from the teeth 11 to the yoke 12 in the split core 10, and the entire region of the coil side face 12s of the yoke 12 can be utilized effectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a split core used for a constituent member of a motor. In particular, the present invention relates to a split core for a motor in which magnetic flux easily passes from a tooth to a yoke portion.

  Conventionally, a rotor or a stator having a core made of a magnetic material and a coil disposed on the core has been used as a component of a motor. FIG. 3 (I) is a schematic configuration diagram showing an example of a stator, and (II) is a cross-sectional view showing a schematic configuration of a divided stator that constitutes the stator. In FIG. 3 (II), the coil is shown only on the left side, and the right side coil is omitted. The stator S is configured by annularly combining a plurality of divided stators m each having a divided core 100 and a coil C. The split core 100 is a T-shaped body formed by laminating a plurality of T-shaped steel plates, and the coil side of the tooth 101 on one end side (the upper side in FIG. 3 (II)) of the rectangular parallelepiped tooth 101. The yoke 102 protrudes from the surface 101s and the flange 103 protrudes from the coil side surface 101s on the other end side (lower side). Further, the coil end side of the split core 100 is configured by a flat surface extending from the yoke 102 to the entire area of the flange 103. The outer peripheral surface of the tooth 101 including the coil side surface 101s, the surface 102f facing the flange in the yoke 102, and the surface 103f facing the yoke in the flange 103 are covered with an insulator 110 made of an insulating material (see FIG. 7 of Patent Document 1). ). The coil C is formed by winding the winding w around the outer periphery of the tooth 101, and is housed in a space (slot) 104 surrounded by the three surfaces 101s, 102f, and 103f covered with the insulator 110. The coil side surface 102s of the yoke 102 that is not covered with the insulator 110 is joined to another adjacent divided core and used for a magnetic path when a plurality of divided stators m are combined in an annular shape.

Here, in the split core, when the motor is assembled, the side adjacent to the other split core is called the coil side, and the surface arranged on this side is called the coil side surface. Also, here, in the split core, the side facing the motor rotation axis _Cm direction when the motor is assembled is called the coil end side, and the surface arranged on this side (in FIG. Surface) is called the coil end surface.

  As another split core, a split core 120 having a yoke 122 protruding over the entire circumference of a tooth 121 as shown in FIG. 4 has been developed (see Patent Document 1). The split core 120 has a coil side surface 122s of the yoke 122 compared to the split core 100 shown in FIG. 3 (I) because the yoke 122 protrudes from the teeth 121 on both the coil end side and the coil side side. Is large and the magnetic path area is increased.

JP 2004-328971 A

However, the split core 120 shown in FIG. 4 does not fully utilize the portion of the yoke 122 protruding toward the coil end side as a magnetic path.
The coil end surface 121e of the tooth 121 and the facing surface 122f of the yoke 122 facing the flange 123 are orthogonal to each other. That is, the angle θ _e formed by both surfaces 121e and 122f is 90 °. Here, of the magnetic flux that has passed through the teeth 121, the magnetic flux that passes through the vicinity of the coil end side end on the coil side surface 122s of the yoke 122 passes through the vicinity of the coil end side of the yoke 122 from the corner formed by the two surfaces 121e and 122f. After that, it flows to the coil side surface 122s. However, in the split core 120, it is difficult for the magnetic flux that has passed through the tooth 121 to flow to the coil end side of the yoke 122 through the corners formed by the two surfaces 121e and 122f as indicated by the broken-line arrows in FIG. Therefore, in the split core 120, the portion of the yoke 122 protruding from the coil end surface 121e of the tooth 121, particularly, the vicinity of the coil end side end of the coil side surface 122s of the yoke 122 cannot be sufficiently utilized for the magnetic path.

  SUMMARY OF THE INVENTION Accordingly, a main object of the present invention is to provide a split core for a motor having a yoke part over the entire circumference of a tooth, in which magnetic flux easily passes from the tooth to the yoke part.

  The present invention achieves the above object by making the coil end surface of the tooth and the end crossing surface connected to the coil end surface of the tooth in the yoke portion non-orthogonal. More specifically, the split core of the present invention includes a columnar tooth and a yoke portion that protrudes over the entire circumference of the tooth. The teeth have a coil end surface. And this invention core makes a core end angle an obtuse angle when the angle which the coil end surface of teeth and the end crossing surface of a yoke part make is a core end angle.

  By setting the core end angle to an obtuse angle, the core of the present invention has a magnetic path that widens from the boundary between the teeth and the yoke toward the coil end side end of the yoke portion. Therefore, the magnetic flux that has passed through the teeth is likely to flow to a portion of the yoke portion that protrudes from the coil end surface of the teeth. Further, the magnetic flux that has flowed to the protruding portion can flow to the coil side surface of the yoke portion. Therefore, the core of the present invention can be effectively used as a magnetic path in almost the entire coil side surface of the yoke portion. Such a core of the present invention increases the amount of magnetic flux passing through, so that a high torque motor can be obtained.

  Further, since the passage of the magnetic flux from the teeth to the yoke portion becomes smooth, the core of the present invention can reduce the iron loss that occurs near the boundary between the teeth and the yoke portion. By reducing the iron loss, the core of the present invention can provide a high output motor.

  The core of the present invention includes a columnar tooth around which a winding is wound, and a yoke portion protruding from one peripheral edge over the entire circumference of the tooth. The teeth and the yoke portion are provided so that the core end angle is an obtuse angle (over 90 °).

  The teeth typically include a pair of coil end surfaces opposed to each other and a pair of coil side surfaces opposed to each other. Both coil end surfaces may be provided so as to be parallel to each other, or may be provided so as to be inclined with respect to a bisector that bisects both coil end surfaces. Both coil side surfaces may also be provided so as to be parallel to each other, or may be provided so as to be inclined with respect to a bisector that bisects both coil side surfaces.

  When both coil end surfaces of the teeth are arranged in parallel and both coil side surfaces are inclined, the coil end surface has a width from one end side (side on which the yoke portion is provided) to the other end side (between both coil side surfaces). The distance is set to be narrow. The inclination angle of the coil side surface is preferably changed according to a core side angle described later.

  When inclining both the coil end surface and the coil side surface of the teeth, the width of the coil end surface (the distance between the coil side surfaces) becomes narrower from one end side to the other end side of the teeth as described above. The coil side surface is provided so that the width (distance between both coil end surfaces) increases from one end side to the other end side. Such teeth can make the magnetic flux density uniform by making the cross-sectional areas substantially equal from one end side to the other end side. The inclination angle of the coil end surface is preferably changed according to the magnitude of the core end angle, and the inclination angle of the coil side surface is preferably changed according to the core side angle described later.

  Further, the teeth may have a step. The split core having a step can make the outer shape of the coil smooth without a step.

  Similarly to the teeth, the yoke part also includes a pair of coil end surfaces and a pair of coil side surfaces. The yoke portion includes an end crossing surface connected to the coil end surface of the tooth and a side crossing surface connected to the coil side surface of the tooth. Windings forming a coil are arranged on the outer periphery of the end crossing surface and the side crossing surface.

  The core of the present invention includes a yoke portion that also protrudes on the coil end side, so that the coil side surface of the yoke portion that forms the magnetic circuit can be enlarged. The core of the present invention increases the amount of magnetic flux passing through the coil side surface of the yoke portion by making the core end angle formed by the end crossing surface and the coil end surface of the tooth an obtuse angle, so that a high torque motor can get. Such an end crossing surface is preferably provided over the entire coil end surface of the tooth.

  The core end angle is preferably more than 90 ° and not more than 135 °. If the area of the coil side surface of the yoke portion is constant and the core end angle is increased, the teeth are reduced. In particular, in a split core with a core end angle of 120 °, when windings are aligned in multiple layers, the windings at the end of each layer can be placed in contact with the end crossing surface. Almost no dead space (space in which no windings can be placed) occurs between them. Therefore, this core can increase the space factor and improve the torque.

  Furthermore, when the angle formed by the coil side surface of the teeth and the side crossing surface of the yoke portion is the (first) core side angle, the core side angle is also preferably an obtuse angle. In the split core having an obtuse core side angle, the magnetic flux easily passes from the teeth to the coil side surface of the yoke portion as compared with the split core having a right core side angle. Therefore, this core can further reduce the iron loss in the vicinity of the boundary between the tooth and the yoke portion. Such a side crossing surface is preferably provided over the entire coil side surface of the tooth.

  As with the core end angle described above, the area of the coil side surface of the yoke portion is kept constant so that the slot does not become small. (First) If the core side angle is increased, the teeth will be reduced, so the core side angle will exceed 90 °. 135 ° or less is preferable. In particular, a split core having a core side angle of 120 ° can reduce dead space as in the case where the core end angle is 120 °.

  When making the core side angle an obtuse angle, it is preferable that the coil side surface of the tooth be inclined so that the coil side surface and the slot of the yoke portion do not become too small.

  The core end angle and the core side angle are preferably the same angle. Further, it is preferable that the end crossing surface and the side crossing surface are smoothly connected. By setting it as such a structure, this division | segmentation core is easy to perform the transfer of a coil | winding between a coil end side and a coil side side.

  The core end angle may be an obtuse angle on at least one coil end side. However, if the core end angle is an obtuse angle on both coil end sides, the magnetic flux more easily passes through the coil side surface of the yoke portion. Further, if the core end angles on both coil ends are equal to each other and a symmetrical core is formed, when the core is compacted as described later, the moldability is excellent. The same applies to the core side angle.

  The coil side surface of the yoke part is preferably parallel to the coil side surface of the tooth. Here, the slot on the coil side is formed in a space sandwiched between the coil side surface of the tooth and the extension surface of the coil side surface of the yoke portion. That is, the extension surface of the coil side surface of the yoke portion forms the outer shape of the slot. Therefore, when windings are arranged in multiple layers along the outer periphery of the teeth on a split core in which the coil side surface of the yoke portion and the coil side surface of the teeth are parallel, the outer shape of each layer formed by the winding becomes the outer shape of the slot. Become parallel. That is, the outer shape of the coil is also parallel to the outer shape of the slot. Therefore, in this core, the outer shape of the coil C does not become a staircase unlike the split core 100 shown in FIG. 3, and a staircase-shaped dead space does not occur. Therefore, this core can effectively reduce the dead space in the slot and increase the space factor.

  The core of the present invention may further include a flange portion protruding from the coil side surface of the tooth on the other end side of the tooth (the side opposite to the side where the yoke portion is provided). Here, the winding is usually introduced on the coil end side. When the winding is introduced from the yoke portion side in the core of the present invention, the starting end portion of the winding is disposed on the end crossing surface. A part of the starting end portion of the winding disposed on the end crossing surface is in contact with the winding forming each layer when the winding is wound in multiple layers, and prevents the winding from being formed in multiple layers. Therefore, the core of the present invention introduces the winding from the other end side of the teeth. Therefore, it is difficult to introduce the winding when the collar portion is on the coil end side. Therefore, it is preferable that the flange portion is provided only on the coil side side and not provided on the coil end side.

  When the core of the present invention has a heel part, and the angle formed by the heel side crossing surface connected to the coil coil side face of the tooth in the heel part and the coil side face of the tooth is the second core side angle, the second core side angle is 90 ° to 135 ° is preferable. In particular, a core having a second core side angle of 90 ° has a large slot, and a core having a 120 ° angle can reduce dead space in the same manner as in the case where the core end angle and the first core side angle are 120 °.

  The core of the present invention is formed of a soft magnetic material such as steel or iron. The core of the present invention can be formed of a laminate of plate materials, a compacted product obtained by pressure-molding powder, or a combination of a laminate of plate materials and a compacted product. In particular, the core of the present invention is easy to manufacture when a green compact is used. Moreover, when setting it as a compacting body, the symmetrical division | segmentation core can make the pressure at the time of manufacture uniform, and is excellent in a moldability. The green compact has a greater degree of freedom in magnetic direction and excellent magnetic properties compared to a laminate of plate materials having a constant magnetic direction.

  In order to improve the insulation between the core of the present invention and the winding, it is preferable to place an insulator made of an insulating material at least at a location where the winding contacts on the outer periphery of the core of the present invention. For example, in the case of a split core including an outer peripheral surface of teeth, an end crossing surface and a side crossing surface of a yoke portion, and a flange portion, the insulator may cover the heel side crossing surface. The insulator may be either a similar shape or a non-similar shape along the outer shape of the core. Examples of the insulating material include resins such as PPS (Poly Phenylene Sulfide) and LCP (Liquid Crystal Polymer).

  In the case where the insulator includes an end covering surface that covers the coil end surface of the tooth and a yoke end covering surface that covers the end crossing surface of the yoke portion, the angle formed by the end covering surface and the yoke end covering surface is defined as the insulating end angle. In this case, the insulating end angle is preferably an obtuse angle similarly to the core end angle, specifically, more than 90 ° and not more than 135 °. In particular, an insulator having an insulation end angle of 120 ° can reduce dead space in the same manner as the split core having a core end angle of 120 °.

  When the insulator is formed so that the insulating end angle becomes equal to the core end angle, it is possible to suppress the local vicinity of the portion covering the end crossing surface from being locally thickened in the insulator. Here, since the split core also functions as a heat radiating member, if the insulator is thick, it is difficult for the heat of the coil to be transmitted to the core, and heat dissipation is reduced. Therefore, it is desirable that the insulator is as thin as possible. For example, if the core end angle is greater than 90 ° and less than 120 °, and the insulation end angle is set to 120 °, the insulator is formed so as to fill the corner formed by the coil end surface and the end crossing surface of the teeth. Become. Therefore, the insulator becomes partially thick. Therefore, it is preferable to provide the end covering surface so as to be parallel to this surface along the coil end surface of the tooth, and to provide the yoke end covering surface so as to be parallel to this surface along the end crossing surface.

  Furthermore, when the insulator includes a side covering surface that covers the coil side surface of the tooth and a yoke side covering surface that covers the side crossing surface of the yoke portion, the angle formed by the side covering surface and the yoke side covering surface is the first angle. When the insulating side angle is used, the first insulating side angle is preferably an obtuse angle, specifically more than 90 ° and not more than 135 °. In particular, the first insulating side angle is preferably 120 ° because dead space can be reduced. Insulators having the same first core side angle and the first insulating side angle can be formed thin overall rather than locally thick. Therefore, it is preferable that the side covering surface is provided so as to be parallel to this surface along the coil side surface of the tooth, and the yoke side covering surface is provided so as to be parallel to this surface along the side crossing surface. Further, an insulator having an insulation end angle equal to the first insulation side angle easily shifts the winding between the coil side and the coil end.

  In the case where the core of the present invention has a collar part and the insulator includes the side covering surface and a collar side covering surface that covers the collar side crossing surface of the collar part, the side covering surface and the collar side covering surface are formed. When the corner is the second insulating side angle, the second insulating side angle is preferably 90 ° to 135 °. An insulator having a second insulating side angle of 120 ° can reduce dead space in the same manner as the split core having a core end angle of 120 °. An insulator having a second insulating side angle of 90 ° can have a large slot. Insulators having the same second core side angle and second insulating side angle can be formed thin overall rather than locally thick.

  The insulator includes a flange on the side so as to protrude from the surface covering the outer peripheral surface of the teeth, that is, the end covering surface and the side covering side (the other end side of the teeth), regardless of the presence or absence of the flange. It is preferable. By providing the flange on the heel side, it is easy to wind the winding in multiple layers. The said heel side coating | coated surface comprises a part of heel side flange. Since the core of the present invention introduces the winding from the flange side, a part of the flange on the flange side is cut out on at least one coil end side to provide an introduction groove.

  When the angle formed between the end covering surface and the flange on the flange side is the second insulating end angle, the second insulating end angle is preferably 90 to 135 °. In particular, when the second insulation end angle is made equal to the second insulation side angle, the winding is easily transferred between the coil side and the coil end.

  The core of the present invention is used for motor parts such as a divided stator constituting a motor. The motor component is obtained by forming a coil by winding a winding around the outer periphery of the tooth (insulator) of the core of the present invention. In particular, a coil formed by winding windings in multiple layers can improve the space factor. As the winding, various types such as a square wire as well as a round wire can be used. As the winding, one having an insulation coating on the outer periphery of the conductor is used.

  By preparing a predetermined number of the motor parts, arranging the motor parts in an annular shape, and holding the motor parts in an annular shape by using an annular member, the motor parts can be used, for example, as an outer rotor or an inner rotor. Each motor component arranged in an annular shape preferably has a concentrated winding structure by connecting ends of windings that form a coil.

  The split core for a motor of the present invention makes it easy for magnetic flux to pass from the teeth to the yoke portion, and the coil side surface of the yoke portion can be effectively used as a magnetic path.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Split core]
FIG. 1 (I) is a front view of the split core for a motor of the present invention as viewed from the coil end side, (II) is a front view of the core of the present invention as viewed from the coil side, and (III) is a perspective view of the core of the present invention. It is. The split core 10 includes a columnar tooth 11 and a yoke portion 12 that protrudes over the entire circumference of the tooth 11 on one end side (the upper side in FIG. 1 (I)) of the tooth 11. That is, the split core 10 has a T shape when viewed from either the coil side or the coil end. Further, the split core 10 includes a flange portion 13 that protrudes from the coil side surface 11s of the tooth 11 on the other end side (the lower side) of the tooth 11. In the split core 10, an insulator (described later) is mainly disposed on the outer periphery of the tooth 11, and a winding is wound thereon to form a split stator. A plurality of such divided stators are prepared, and the motor stator is formed by holding the coil side surfaces 12s of the yoke portions 12 of the divided stators in an annular shape.

The most significant characteristics of the divided core 10 includes a coil end surface 11e of the teeth 11, the end cross surface 12 _fe and is made square (core end angle) leading to the coil end surface 11e of the tooth 11 in the yoke portion 12 theta _e is obtuse In that point.

  The teeth 11 are composed of a pair of coil end surfaces 11e and a pair of coil side surfaces 11s. Each coil end surface 11e is a trapezoidal surface extending from the flange portion 13 side toward the yoke portion 12 side, and is disposed to face each other so as to be parallel to each other. Each of the coil side surfaces 11s is a rectangular surface that is inclined with respect to the bisector B between the two coil side surfaces 11s and is disposed so as to cross the extended surfaces.

The yoke portion 12 includes an end crossing surface 12 _fe connected to the coil end surface 11e of the tooth 11 and a coil end surface 12e protruding from the coil end surface 11e of the tooth 11 on both coil end sides. Further, the yoke 12 comprises the two coils-side, and the coil side surface 12s which is bonded to the other split core, and a side intersecting surfaces 12 _fs connected to the coil side surface 11s of the teeth 11. The split core 10 has a coil end surface 11e and the end cross surface 12 _fe and is made square (core end angle) theta _e of the teeth 11 and the 120 °. Further, the split core 10 has an angle (first core side angle) θ _s1 formed by the coil side surface 11s of the tooth 11 and the side crossing surface 12 _fs of 120 °.

The end crossing surface 12 _fe has a trapezoidal shape extending from the tooth 11 side toward the yoke portion 12 side, and is provided over the entire coil end surface 11 e of the tooth 11. The peripheral edge of the end crossing surface 12 _{fe on} the yoke part side is in contact with the inner side surface 12 i facing the outer side surface 12 o in the yoke part 12, and is not connected to the coil end surface 12 e of the yoke part 12. You may provide an end crossing surface so that it may connect with both the coil end surface of a teeth, and the coil end surface of a yoke part.

The side crossing surface 12 _fs also has a trapezoidal shape extending from the tooth 11 side toward the yoke portion 12 side, and is provided over the entire coil side surface 11s of the tooth 11. The peripheral edge of the side crossing surface 12 _{fs on} the yoke part side is in contact with the surface 12 _f of the yoke part 12 facing the flange, and is not connected to the coil side surface 12 s of the yoke part 12. You may provide a side crossing surface so that it may connect with both the coil side surface of teeth, and the coil side surface of a yoke part. The end intersection surface 12 _fe and the side intersection surface 12 _fs are smoothly connected.

  In the split core 10, the coil side surface 11s of the tooth 11 and the coil side surface 12s of the yoke portion 12 are parallel, and the coil end surface 11e of the tooth 11 and the coil end surface 12e of the yoke portion 12 are parallel. .

The flange portion 13 is provided on the coil side side so as to face the yoke portion 12, and includes a flange side crossing surface 13f connected to the coil side surface 11s of the tooth 11. The split core 10 has an angle (second core side angle) θ _{s2 formed} by the heel side crossing surface 13f and the coil side surface 11s of the tooth 11 of 120 °.

  The split core 10 is a compacted body using a powder made of a soft magnetic material, and the teeth 11, the yoke portion 12, and the flange portion 13 are integrally molded. By forming a compacted body, it is possible to easily and accurately form the split core 10 having a complicated shape. The split core 10 has a symmetrical shape on both the coil side side and the coil end side, and is excellent in moldability.

[Insulator]
FIG. 2 is a view showing a state in which an insulator is arranged on the outer periphery of the split core 10, wherein (I) is a front view seen from the coil end side, and (II) is a front view seen from the coil side side. . 2, the same reference numerals as those in FIG. 1 denote the same items. In FIG. 2 (I), the winding (cross section) is shown only on the left side, and the right side is omitted. The insulator 20 is a member that insulates the split core 10 and the winding w, and mainly covers the outer periphery of the tooth 11. Specifically, the insulator 20 includes a cylindrical portion 21 that covers the outer peripheral surface of the tooth 11, a yoke-side flange 22 that protrudes from the periphery of the cylindrical portion 21 on one end side of the cylindrical portion 21, and the other end side And a flange side flange 23 protruding from the peripheral edge of the cylindrical portion 21.

The cylindrical portion 21 has an end covering surface 21e that covers the coil end surface 11e of the tooth 11, and a side covering surface 21s that covers the coil side surface 11s. The yoke-side flange 22 is provided over the entire circumference of the cylindrical portion 21, and on both coil end sides, a yoke end covering surface 22 _fe that covers the end crossing surface 12 _fe of the yoke portion 12 and both coil side sides And a yoke side covering surface 22 _fs that covers the side crossing surface 12 _fs of the yoke portion 12. The flange side flange 23 is provided over the entire circumference of the tubular portion 21 and includes a flange side covering surface 23s that covers the flange side crossing surface 13f of the flange portion 13.

The cylindrical portion 21 is formed along the outer peripheral surface of the tooth 11, the coil end surface 11e of the tooth and the end covering surface 21e are parallel, and the coil side surface 11s and the side covering surface 21s are parallel. The yoke end covering surface 22 _fe is formed so as to be parallel to the end crossing surface 12 _fe . Therefore, the angle (first insulating end angle) α _e1 formed by the end covering surface 21e and the yoke end covering surface 22 _fe is 120 °, similarly to the core end angle θ _e . The yoke side covering surface 22 _fs is formed to be parallel along the side crossing surface 12 _fs , and the angle (first insulating side angle) α _s1 formed by the side covering surface 21s and the yoke side covering surface 22 _fs is The first core side angle θ _s1 is 120 °. Further, the heel side covering surface 23s is formed so as to be parallel to the heel side crossing surface 13f of the heel part 13, and an angle formed by the side covering surface 21s and the heel side covering surface 23s (second insulating side angle). ) α _s2 is 120 °, similar to the second core side angle θ _s2 .

Further, as shown in FIG. 2 (II), the insulator 20 has a portion that covers the flange portion 13 on the coil end side. This portion is provided so as to protrude from the end covering surface 21e, and is smoothly connected to the heel side covering surface 23s. More specifically, when viewed from the coil side, the flange side flange 23 includes an inclined portion that extends from the end covering surface 21e toward the end surface side (lower side in FIG. 2) of the split core 10, and the inclined portion includes It has a collar end covering surface 23e connected to the end covering surface 21e. The angle (second insulating end angle) α _e2 formed by the end covering surface 23e and the end covering surface 21e is 120 °, similarly to the second insulating side angle α _s2 . Further, on one coil end side, an introduction groove 24 for introducing the winding w is provided in this inclined portion. The introduction groove 24 is formed by cutting out a part from the end surface of the split core 10 to the end covering surface 21e. The introduction groove 24 has an oblique line shape, but may be a curved shape or a straight line shape along the bisector B, for example. The bottom surface of the introduction groove 24 is flush with the end covering surface 21e, but may be an inclined surface such that the end covering surface 21e side is lowered. In addition, introduction grooves may be provided on both coil end sides.

Furthermore, the insulator 20 has a protruding covering surface 22e that covers the coil end surface 12e of the yoke portion 12, a portion that covers the inner surface of the yoke portion 12, and a portion that covers the opposing surface of the yoke portion 12. Therefore, when the insulator 20 is disposed on the split core 10, the coil side surface 12s and the outer side surface 12o of the yoke portion 12 and the end surface of the flange portion 13 are exposed. A space surrounded by the side covering surface 21s, the yoke side covering surface 22 _fs , and the heel side covering surface 23s creates a slot on the coil side, and is surrounded by the end covering surface 21e, the yoke end covering surface 22 _fe , and the heel end covering surface 23e. The space creates a slot on the coil end side.

  In addition, the insulator 20 has a configuration in which a pair of divided pieces are combined and integrated, and can be easily arranged on the divided core 10. The split piece has a configuration in which the joint 25 is positioned on the coil end side, but may have a configuration positioned on the coil side side or a configuration positioned on the boundary between the coil end and the coil side. When the joints of the split pieces are joined with an adhesive or the like, the split pieces are difficult to drop off from the split core. The joint 25 has a step shape having a straight line portion arranged on the bisector B and a straight line portion parallel to the bisector B. Therefore, in the insulator 20, it is difficult for the split pieces to be separated after joining. On the other hand, when the seam is a straight line arranged on the bisector B, it is easy to manufacture a segment. Furthermore, since the insulator 20 has a fitting groove in a part of the cylindrical portion 21, it is easy to align the windings w. Moreover, you may provide a level | step difference over the perimeter of a cylindrical part.

[effect]
In the split core 10, the core end angle θ _e is an obtuse angle, so that the magnetic flux easily passes from the teeth 11 toward the yoke portion 12. In particular, since the split core 10 can sufficiently flow a magnetic flux also near the coil end side end of the yoke part 12, almost the entire region of the coil side surface 12s of the yoke part 12 can be effectively used as a magnetic path. Therefore, the split core 10 has a large amount of passing magnetic flux and can improve torque.

  Further, the split core 10 can smoothly pass the magnetic flux from the teeth 11 to the yoke portion 12, and therefore, iron loss in the vicinity of the boundary between the teeth 11 and the yoke portion 12 can be reduced. Due to the reduction of the iron loss, the split core 10 can improve the output.

In addition, since the first core side angle θ _{s1 of} the split core 10 is also an obtuse angle, the dead space in the slot can be reduced when winding the windings in multiple layers. In particular, by setting the first core side angle θ _s1 to 120 ° and the first insulating side angle α _s1 of the insulator 20 to 120 °, the windings at the end of each layer can be connected to the yoke side as shown in FIG. It can be in contact with the coated surface 22 _fs . Therefore, the split core 10 has very little dead space between the winding and the yoke side covering surface 22 _fs . Further, since the split core 10 has both the second core side angle θ _s2 and the second insulating side angle α _{s2 set} to 120 °, the winding at the end of each layer can be brought into contact with the heel side covering surface 23s. , Dead space can be further reduced.

  Further, in the split core 10, the coil side surface 11s of the tooth 11 (side covering surface 21s of the insulator 20) and the coil side surface 12s of the yoke portion 12 are parallel. That is, the coil side surface 11s of the tooth 11 is parallel to the outer shape of the slot. Therefore, when winding the windings in multiple layers, the windings forming each layer are arranged along the coil side surface 11s of the tooth 11 and have a linear shape along the outer shape of the slot. Therefore, in the split core 10, the outer shape of the coil is not stepped, and the dead space can be reduced.

  Due to the reduction of the dead space, the split core 10 can increase the space factor and further improve the torque.

Further, since the split core 10 has an obtuse first core side angle θ _s1 , the magnetic flux easily passes through the teeth 11 and iron loss can be further reduced. The split core 10 can further improve the output by reducing the iron loss. Furthermore, the split core 10 can further improve the torque by effectively using the magnetic flux within a range where the magnetic flux is not saturated.

In addition, the split core 10 has the first insulating end angle α _e1 and the second insulating end angle α _e2 equal to the first insulating side angle α _s1 and the second insulating side angle α _s2 , respectively. The winding w can be smoothly transferred to and from the end side, and the winding property is excellent.

  Further, since the insulator 20 is thin except for the inclined portion protruding at the heel flange 23, the insulator 20 is excellent in heat dissipation. Further, the insulator 20 has the introduction groove 24 in the flange 23, so that the winding start end portion is introduced from the introduction groove 24 and the coil that is connected to the start end portion to form a coil is side-coated from the end covering surface 21e. Can be placed on surface 21s. The end of the winding is pulled out from either the yoke side or the collar side.

  The above-described embodiments can be appropriately changed without departing from the gist of the present invention, and are not limited to the above-described configuration. For example, the second core side angle and the second insulating side angle may be 90 °.

  The split core for a motor of the present invention can be suitably used for a motor component such as a stator. The motor having the split core can be suitably used for a motor that requires high output, such as an electric vehicle or a hybrid vehicle.

(I) is a front view of the split core for a motor of the present invention viewed from the coil end side, (II) is a front view of the core of the present invention viewed from the coil side, and (III) is a perspective view of the core of the present invention. . FIG. 2 is a view showing a state in which an insulator is arranged on the outer periphery of the split core shown in FIG. 1, where (I) is a front view seen from the coil end side, and (II) is a front view seen from the coil side side. (I) is a front view schematically showing a state in which a plurality of split stators having a conventional split core are combined and arranged in an annular shape, and (II) is a cross-sectional view of a conventional split core. (I) is a perspective view of a split core having a yoke over the entire circumference of the teeth, and (II) is an explanatory diagram for explaining the flow of magnetic flux in this core.

Explanation of symbols

10 split cores 11 teeth 11e teeth coil end surface
11s Coil side surface of teeth 12 Yoke part 12 _fe end crossing surface
12 _fs side crossing surface 12i Inner side surface 12o Outer side surface 12f Opposite surface of yoke part
12e Coil end surface of yoke 12s Coil side surface of yoke
13 Buttocks 13f 鍔 Side crossing
20 Insulator 21 Cylindrical part 21e End covering surface 21s Side covering surface
22 Yoke side flange 22e Projection coated surface 22 _Fe Yoke end coated surface
22 _fs yoke side covering surface 23 鍔 side flange 23e 鍔 end covering surface
23s 鍔 Side covering surface 24 Introduction groove 25 Joint
100,120 Split core 101,121 Teeth 101s Teeth coil side surface
102,122 Yoke 102f, 122f The opposing surface of the yoke
102s, 122s Coil side surface of yoke 103,123 鍔 103f 対 向 opposite surface
104 Slot 110 Insulator 121e Teeth coil end surface
m Split stator C Coil S Stator w Winding

Claims (5)

A split core for a motor comprising columnar teeth and a yoke portion protruding over the entire circumference of the teeth,
The teeth have a coil end surface,
The yoke part has an end crossing surface connected to the coil end surface of the tooth.
A split core for a motor, wherein a core end angle is an obtuse angle when an angle formed by a coil end surface of a tooth and an end crossing surface of a yoke portion is a core end angle. An insulator is arranged on the outer periphery of the split core,
This insulator includes an end covering surface that covers the coil end surface of the tooth, and a yoke end covering surface that covers the end crossing surface of the yoke portion.
2. The split core for a motor according to claim 1, wherein an insulating end angle is 120 ° when an angle formed by the end covering surface and the yoke end covering surface is an insulating end angle.   3. The split core for motor according to claim 2, wherein the core end angle of the split core is equal to the insulating end angle of the insulator. The teeth have a coil side surface,
The yoke part has a side crossing surface connected to the coil side surface of the tooth,
2. The split core for a motor according to claim 1, wherein the core side angle is an obtuse angle when an angle formed by the coil side surface of the tooth and the side crossing surface of the yoke portion is a core side angle.   5. The split core for a motor according to claim 4, wherein the core end angle and the core side angle are the same angle.

Images