JP2021044863A - Stator for inner rotor type motor - Google Patents

Abstract

To provide a stator for an inner rotor type motor, where assembling is simplified.SOLUTION: A stator for an inner rotor type motor comprises: a first and second coil bobbins around which a first and second coils are wound, respectively; a stator core including a toric part and a first and second tooth parts that protrude from inside the toric part, are inserted into the first and second coil bobbins, and are adjacent to each other; and a holder attached to the inside of the toric part. The holder includes a restriction protrusion that protrudes toward a gap between the first and second tooth parts, restricts movement in a removal direction in which the first coil bobbin can be removed from the first tooth part, and restricts movement in a removal direction in which the second coil bobbin can be removed from the second tooth part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a stator of an inner rotor type motor.

As the stator core of the inner rotor type motor, there is a so-called split core that is previously divided into a plurality of parts in the circumferential direction (see, for example, Patent Document 1). A coil bobbin around which a coil is wound is attached to the teeth portion of the split core, and then the split cores are joined to each other to manufacture a stator core.

Japanese Unexamined Patent Publication No. 2017-022971

Such a coil bobbin may be press-fitted into the teeth portion in order to prevent it from falling off from the teeth portion. Dedicated equipment is required for such press-fitting, which complicates the assembly process.

Therefore, an object of the present invention is to provide a stator of an inner rotor type motor whose assembly is simplified.

The purpose of the above is to insert the first and second coil bobbins in which the first and second coils are wound, the annular portion, and the first and second coil bobbins protruding from the inside of the annular portion and adjacent to each other. The stator core including the first and second tooth portions and a holder attached to the inside of the annular portion are provided, and the holder protrudes between the first and second tooth portions, and the first An inner rotor including a regulating protrusion that regulates the movement of the 1-coil bobbin in the removal direction when it is removed from the first tooth portion and regulates the movement of the second coil bobbin in the removal direction when it is removed from the second tooth portion. This can be achieved by the stator of the type motor.

It is possible to provide a stator of an inner rotor type motor that is easy to assemble.

FIG. 1 is an external perspective view of the stator of the first embodiment. FIG. 2 is an exploded perspective view of the stator of the first embodiment. FIG. 3 is an external perspective view of the stator of the second embodiment. FIG. 4 is an external perspective view of the stator of the third embodiment.

[First Example]
FIG. 1 is an external perspective view of the stator 1 of the first embodiment, and FIG. 2 is an exploded perspective view of the stator 1 of the first embodiment. The stator 1 is used in the inner rotor type motor. The stator 1 includes a stator core 10, two coil bobbins 20, two holders 30, and two coils C. Rotators (not shown) magnetized with different polarities in the circumferential direction are rotatably arranged in the stator core 10. When the two coils C are energized and controlled, a magnetic attraction force and a magnetic repulsion force are generated between the stator core 10 and the rotor, whereby the rotor rotates. Note that FIGS. 1 and 2 show the X, Y, and Z directions that are orthogonal to each other. The two coil bobbins 20 are arranged side by side in the X direction, and the two holders 30 are arranged side by side in the Y direction. The central axis of the stator core 10 is parallel to the Z direction. The central axis of the stator core 10 coincides with the rotation axis of the rotor (not shown).

The stator core 10 is made of metal and includes an annular portion 12 and two tooth portions 14 as shown in FIG. The two tooth portions 14 project from the inside of the annular portion 12 toward the center of the annular portion 12 and are arranged in the X direction. The cross section of the YZ plane of the teeth portion 14 is substantially rectangular. The tip surface of the tooth portion 14 is curved in an arc shape centered on the center of the stator core 10. Facing a rotor (not shown). The stator core 10 is not composed of so-called divided stator cores divided in the circumferential direction, but is integrally molded in the circumferential direction. Specifically, the stator core 10 is formed by laminating a plurality of plate-shaped metal members such as soft magnetic steel plates such as silicon steel plates and electromagnetic steel plates in the Z direction. Further, it may be integrally molded with a metal member such as soft magnetic powder.

The coil bobbin 20 is made of an insulating synthetic resin, and includes a tubular portion 22, an outer flange portion 24, and an inner flange portion 26 as shown in FIG. The tubular portion 22 extends in the X direction, and an outer flange portion 24 is formed at one end of the tubular portion 22 and an inner flange portion 26 is formed at the other end. The coil C is wound around the outer peripheral portion of the tubular portion 22 between the outer flange portion 24 and the inner flange portion 26. The inner flange portion 26 is formed to be larger than the outer flange portion 24, but the size is not limited to this, and the inner flange portion 26 may have the same size.

The tubular portion 22 defines a hole 23 into which the tooth portion 14 of the stator core 10 is inserted. The coil bobbin 20 is assembled to the stator core 10 by inserting the tooth portion 14 of the stator core 10 into the hole 23 so that the inner flange portion 26 is located closer to the center of the stator core 10 than the outer flange portion 24. Therefore, as shown in FIG. 1, the inner flange portions 26 of the two coil bobbins 20 are assembled to the stator core 10 so as to face each other. Here, the inner diameter of the hole 23 and the outer diameter of the tooth portion 14 have substantially the same size and shape, and the tooth portion 14 does not need to be press-fitted into the hole 23 and can be easily inserted. Therefore, the coil bobbin 20 can be easily assembled to the stator core 10, and the assembling process is simplified. In addition, "it is not necessary to press-fit" means that when the tooth portion 14 is inserted into the hole 23, the hole 23 is not elastically deformed so as to expand.

Here, the insertion direction of the two coil bobbins 20 into one of the teeth portions 14 is the + X direction, and the insertion direction of the other coil bobbins 20 into the teeth portion 14 is the −X direction. Therefore, the extraction direction of the two coil bobbins 20 from one tooth portion 14 is the −X direction, and the extraction direction from the other tooth portion 14 is the + X direction. In other words, these removal directions are also the direction in which the teeth portion 14 extends and the direction toward the center of the stator core 10.

The holder 30 is made of an insulating synthetic resin, and includes a covering portion 32, a flange portion 34, and a regulating protrusion 36 as shown in FIG. The covering portion 32 has substantially the same height as the height of the stator core 10 in the Z direction, and is curved in an arc shape with substantially the same curvature as the inner surface of the annular portion 12 of the stator core 10. The regulation protrusion 36 has substantially the same height in the Z direction as the covering portion 32 and projects from the inside of the covering portion 32. The holder 30 is assembled to one side (+ Y direction side) and the other side (−Y direction side) of the annular portion 12 partitioned by the two tooth portions 14 of the stator core 10, respectively. Specifically, in the holder 30, the covering portion 32 is located inside the annular portion 12 between the two teeth portions 14, and the flange portion 34 comes into contact with the upper surface of the annular portion 12 of the stator core 10 to regulate the holder 30. The protrusion 36 is assembled to the stator core 10 so as to project toward the center of the stator core 10. By contacting the flange portion 34 with the upper surface of the annular portion 12, the position of the holder 30 with respect to the stator core 10 in the Z direction is defined. After assembling the two coil bobbins 20 around which the coil C is wound to the stator core 10 in advance, the two holders 30 are assembled to the stator core 10.

As shown in FIG. 1, the regulation protrusion 36 is in contact with the inner flange portion 26 of the two coil bobbins 20 inserted into the two teeth portions 14, respectively. That is, the regulation protrusion 36 of the holder 30 projects between the two coil bobbins 20 and restricts the movement of the two coil bobbins 20 in the above-mentioned removal direction. This prevents the coil bobbin 20 from falling off from the teeth portion 14.

Further, the covering portion 32 covers the inside of the annular portion 12 of the stator core 10. Therefore, the coil C is prevented from coming into contact with the inside of the annular portion 12 of the stator core 10, and the insulating property between the stator core 10 and the coil C is ensured. Further, the coil C is in contact with the covering portion 32, and a coil C having a large wire diameter is adopted, whereby the torque of the rotor is secured. Even if the coil C has a small wire diameter, the ampere turn can be secured and the torque of the rotor can be secured by securing a large number of turns so as to come into contact with the covering portion 32.

Further, by restricting the movement of the two coil bobbins 20 in the removal direction by the holder 30, the movement of the stator core 10 of the holder 30 in the circumferential direction with respect to the annular portion 12 is restricted. As a result, rattling of the holder 30 is also prevented.

Further, since the two holders 30 are assembled to the stator core 10 so as to separate the two coil bobbins 20 from each other, the two coil bobbins 20 and the two holders 30 are stably assembled to the stator core 10. The rattling of the member is prevented.

In this embodiment, the two holders 30 are not limited to preventing the two coil bobbins 20 from falling off. For example, only one holder 30 can prevent the two coil bobbins 20 from falling off, but the two coil bobbins 20 are loose. From the viewpoint of preventing sticking and avoiding contact of the two coils C with the stator core 10, it is preferable to use the two holders 30. Further, the two holders 30 may be integrally formed in advance. For example, the flanges 34 of the two holders 30 may be continuously formed so as to orbit on the upper surface of the stator core 10.

Further, in the present embodiment, the length of the covering portion 32 of the holder 30 in the Z direction is not limited to substantially the same as the length of the annular portion 12 in the Z direction, and the length of the annular portion 12 in the Z direction. Although it may be shorter than that, from the viewpoint of avoiding contact between the coil C and the stator core 10, it is preferable that the length of the annular portion 12 is substantially the same as or longer than the length of the annular portion 12 in the Z direction.

[Second Example]
FIG. 3 is an external perspective view of the stator 1A of the second embodiment. The same configuration as that of the first embodiment is designated by the same reference numerals, so that duplicate description will be omitted. The holder 30a is provided with a fixing portion 38 projecting in a columnar shape in the + Z direction from the upper surface of the flange portion 34 and the upper surface of the regulating protrusion 36 continuous thereto. The length of the fixed portion 38 in the + Z direction is such that the height position of the tip of the fixed portion 38 in the + Z direction is higher than the height position of the inner flange portion 26 and the outer flange portion 24 in the + Z direction. Is formed in. The fixing portion 38 has a screw hole 38a, and can be fixed to another member such as a printed circuit board on which a control circuit for controlling energization of the coil C is formed by using a screw. As described above, since the fixing portion 38 is formed on the holder 30a that prevents the coil bobbin 20 from falling off, the number of parts is reduced.

In the second embodiment, the fixing portion 38 protrudes from the upper surface of the collar portion 34 and the upper surface of the regulation protrusion 36 continuous thereto, but is not limited to this, and for example, the fixing portion 38 protrudes only from the upper surface of the collar portion 34. Alternatively, it may protrude only from the upper surface of the regulation protrusion 36.

[Third Example]
FIG. 4 is an external perspective view of the stator 1B of the third embodiment. The holder 30b is provided with a holding portion 39 projecting in a prismatic direction in the + Z direction from the upper surface of the flange portion 34 and the upper surface of the regulating protrusion 36 continuous thereto. The holding portion 39 holds the terminal pin T to which the coil C is electrically connected. For example, the terminal pin T can be conductively connected to the terminal pin provided on the printed circuit board side. Also in this case, since the holding portion 39 holding the terminal pin T is formed on the holder 30b that prevents the coil bobbin 20 from falling off, the number of parts is reduced.

In the third embodiment, the holding portion 39 protrudes from the upper surface of the collar portion 34 and the upper surface of the regulation protrusion 36 continuous thereto, but is not limited to this, and for example, the holding portion 39 protrudes only from the upper surface of the collar portion 34. Alternatively, it may protrude only from the upper surface of the regulation protrusion 36.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and modifications and modifications can be made within the scope of the gist of the present invention described in the claims. It is possible.

In the above embodiment, the stator core 10 is not composed of the divided cores divided in the circumferential direction, but may be composed of the divided cores. In this case, it is preferable to join a plurality of divided cores before inserting the coil bobbin into the tooth portion, and then insert the coil bobbin into the tooth portion to assemble the holder.

Both the fixing portion 38 as in the second embodiment and the holding portion 39 for holding the terminal pin T as in the third embodiment may be provided for one holder.

In the above embodiment, the stator core 10 is provided with two teeth portions 14, but the number of teeth portions is not limited to this. For example, even when three or more tooth portions are provided, the holder may be assembled so as to restrict the movement of the coil bobbins assembled to the adjacent tooth portions in the removal direction.

In the first embodiment, the holder 30 is made of synthetic resin, but may be made of rubber having a certain degree of rigidity. Since the holders 30a and 30b in the second and third embodiments are provided with the fixing portion 38 and the holding portion 39, respectively, it is preferable that the holders 30a and 30b are made of synthetic resin having a certain degree of rigidity. Further, the holder 30 may be made of a metal having no insulating property as long as the coil C does not come into contact with the holder 30.

1, 1A, 1B Stator 10 Stator core 12 Circular part 14 Teeth part 20 Coil bobbin 23 Holes 30, 30a, 30b Holder 32 Covering part 34 Collar part 36 Regulatory protrusion 38 Fixing part 39 Holding part C Coil T Terminal pin

Claims (10)

The first and second coil bobbins, in which the first and second coils are wound, respectively,
A stator core including an annular portion and first and second tooth portions that protrude from the inside of the annular portion and have the first and second coil bobbins inserted and adjacent to each other.
With a holder attached to the inside of the annular portion,
The holder protrudes between the first and second tooth portions to regulate the movement of the first coil bobbin in the removal direction in which the first coil bobbin is removed from the first tooth portion, and the second coil bobbin is the second coil bobbin. An inner rotor type motor stator that includes a regulatory protrusion that regulates movement in the removal direction that is removed from the teeth section. The stator of the inner rotor type motor according to claim 1, wherein the holder includes a covering portion that covers the inside of the annular portion. The holder is a stator of the inner rotor type motor according to claim 1 or 2, which has an insulating property. The stator of the inner rotor type motor according to claim 3, wherein at least one of the first and second coils is in contact with the covering portion. The inner according to any one of claims 1 to 4, wherein the holder regulates the movement of the first and second coil bobbins in the removal direction, thereby restricting the movement of the holder in the circumferential direction with respect to the annular portion. Rotor type motor stator. The stator of the inner rotor type motor according to any one of claims 1 to 5, wherein the holder includes a flange portion that abuts on the upper surface of the annular portion. The stator of the inner rotor type motor according to any one of claims 1 to 6, wherein the holder includes a fixing portion for fixing the holder to another member. The stator of the inner rotor type motor according to any one of claims 1 to 7, wherein the holder includes a holding portion for holding a terminal to which one of the first and second coils is electrically connected. The stator of the inner rotor type motor according to any one of claims 1 to 8, further comprising two holders arranged in a direction intersecting the direction in which the first and second coil bobbins are arranged. The stator of the inner rotor type motor according to any one of claims 1 to 9, wherein the stator core is integrally formed without being divided in the circumferential direction.

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