JP5703045B2 - Electric motor - Google Patents

Description

  The present invention relates to an electric motor.

  There is Patent Document 1 as a background art of this technical field. In this document, “a projection is integrally formed on the wall surface of the hollow portion of the winding bobbin fitted to the teeth portion of the tea score, and the winding bobbin is fixed and held by crushing the projection when the winding bobbin is fitted.” (For example, see abstracts, specification 0008, etc.). Moreover, there exists patent document 2 as another background art. In this document, “a bobbin for insulating a winding is provided with a convex part in the stacking direction, and the bobbin shape has the same inner diameter side dimension and outer diameter side dimension. The convex portion of the bobbin is fitted to the above. "

JP 2001-327109 A JP 2001-157387 A

  Regarding the winding of the stator, as shown in Patent Documents 1 and 2 described above, a configuration in which the winding is attached to the teeth in a state of being wound around a bobbin is known. When such a winding method is adopted, the fixing method between the bobbin and the teeth becomes a problem.

  As described above, Patent Documents 1 and 2 describe a method of fixing a bobbin and a tooth. However, the bobbin fixing method of Patent Document 1 has a negative effect on durability because stress remains after fixing. May give. Moreover, since the bobbin fixing method of Patent Document 2 changes the shape of the teeth, the magnetic characteristics may be adversely affected.

  Moreover, although patent document 1 is provided with the printing plate which contact | abuts a some bobbin for positioning, it is not intending fixation of a bobbin and a tooth.

  Accordingly, an object of the present invention is to provide a structure capable of fixing a bobbin and a tooth without adversely affecting the durability and characteristics of the electric motor.

In order to achieve the above object, the electric motor of the present invention includes a stator core having a plurality of teeth portions in the circumferential direction and a hollow insulating material wound around the stator windings and inserted into the teeth portions, A bobbin holder for fitting with a plurality of the insulating materials and fixing them to the stator core,
The insulating material has a protrusion at the end of the extending portion that extends in the direction of insertion into the teeth portion,
The bobbin holder is fixed to one end face of the stator core, and meshes with the protrusions to fix the insulating material to the stator core .

In the above-described configuration of the present invention, more preferred specific embodiments are as follows.
(1) At least two bobbin holders are integrally formed so as to follow the circumferential arrangement of the plurality of tooth portions.
(2) The insulating material is inserted so that the extending portion is aligned with one end surface of the stator core, and the extending portion is disposed on the one end surface,
A bolt that penetrates the stator core in the direction of the rotation axis from the one side end face of the steel sheet is provided such that a head is positioned on the one end face of the stator core,
The bobbin holder has a barrier to prevent contact between the head and the stator winding.
(3) A cover for covering the bobbin holder from the rotation axis direction is provided, and the bobbin holder is fixed to the stator core by fixing the cover and the stator.
(4) The bobbin holder is divided into a plurality in the circumferential direction.
(5) The stator core is composed of a split core, and the split position of the stator core matches the split position in the circumferential direction of the bobbin holder.
(6) The stator iron core has a plurality of tooth portions projecting to the outer circumferential side in the circumferential direction, and is an outer rotor type electric motor including a cylindrical rotor on the outer circumferential side of the teeth portion, The rotor is composed of a rotor core divided into a plurality of parts, and a magnet is disposed on the inner surface of the rotor core.
(7) The bobbin holder is made of an insulating resin.

  ADVANTAGE OF THE INVENTION According to this invention, the structure which can fix a bobbin, without affecting the durability and characteristic of an electric motor can be provided. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a perspective view which shows a part of stator part of an electric motor. It is A arrow directional view of FIG. It is an upper perspective view of a bobbin holder. It is a downward perspective view of a bobbin holder. It is a top view of the state where the bobbin holder was attached. It is a stator whole view when the center axis | shaft of a motor is leveled. It is an upper expansion perspective view of a stator part. It is a perspective view which shows the state in which the cover which covers an extending | stretching part and a bobbin holder from upper direction was attached.

  The embodiment of the present invention is premised on a stator that is inserted into a rectangular tooth of a stator core and constitutes a concentrated winding coil in a state in which the stator winding is wound around an insulating material. In this configuration, a protrusion is provided at the tip of the insulating material around which the stator winding is wound. A plurality of insulating materials exist in the circumferential direction for each tooth, and a member constituting a fitting portion that meshes with the protrusions of these insulating materials is provided. Thus, the combination of the fitting portion of the member and the protrusion of the insulating material prevents the insulating material from falling off the stator.

  As will be apparent from the drawings that will be described in detail below, the present embodiment has a teeth portion that protrudes to the outer peripheral side of the stator core. The rotor is located further on the outer peripheral side than these teeth portions (not shown). That is, a so-called outer rotor type electric motor will be described as an example. In addition, the stator core is divided into six in the circumferential direction, each having eight teeth, and the stator as a whole has a so-called 48-slot stator having 48 teeth. This division is intended to improve the material usage rate by making the shape of the stator core collected from the electromagnetic steel sheet into a substantially rectangular shape.

  Hereinafter, specific examples of the present embodiment will be described with reference to the drawings. 1-6 is a figure which shows the electric motor of this embodiment.

  FIG. 1 is a perspective view showing a part of a stator portion of an electric motor. In FIG. 1, a tooth portion 1 a provided on the stator core 1 is provided in a shape protruding to the outer peripheral side, and these tooth portions 1 a are covered with an insulating material 2 (bobbin 2). A stator winding 3 is wound around the insulating material 2 to form a so-called concentrated winding coil. The insulating material 2 has a hollow rectangular shape, is provided with an extending portion 2a in the direction of insertion into the tooth portion 1a, and has a T-shaped projection 2a ′ at the tip. .

  The extending portion 2a is provided on one side of the stator core 1, and is not provided on the other side. In the following description, unless otherwise specified, in the stacking direction of the laminated steel sheets (the extending direction of the rotating shaft), the side where the extending portion 2a is provided is referred to as the upper side, and the other side is referred to as the lower side.

  In FIG. 1, the leftmost insulating material 2 is present at a position away from the tooth portion 1 a, and this shows a state before being attached to the stator core 1. In actual attachment, as shown in FIG. 1, the stator winding 3 is wound around the outer periphery of the insulating material 2 and inserted into the tooth portion 1a. At this time, since the plurality of insulating materials 2 are arranged radially, the protrusions 2 a are aligned in the circumferential direction on the center side of the stator core 1. In this way, the extending portion 2a is arranged on one side of the stator core 1, so that the fixing method according to the present embodiment can be easily performed.

  FIG. 2 is a view taken in the direction of arrow A in FIG. For convenience of explanation, the stator core 1 is omitted. That is, the insulating material 2 is viewed from below. In FIG. 2, an arcuate member 4 (hereinafter referred to as a bobbin holder 4) provided with a function of fixing the insulating material 2 is provided with a plurality of protrusions 4 a radially, and the protrusions 4 a are formed on the bobbin 2. T-shaped so as to mesh with the T-shaped projection 2a ′. In this manner, eight bobbins 2 are fitted and fixed to each bobbin holder 4 by the respective protrusions.

  This fixing is performed by inserting the bobbin holder 4 from above in the stacking direction of the steel sheets of the stator core 1 with all the insulating materials 2 attached to the teeth portion 1a. Once the protrusions 4a of the bobbin holder 4 and the protrusions 2a of the respective insulating materials 2 are fitted together, the insulating material 2a can be prevented from coming off as will be described later. The material of the bobbin holder 4 is preferably an insulating material such as resin. The reason for this will be described later.

  FIG. 3 is a top perspective view of the bobbin holder 4. The same number of protruding barrier walls 4b as the teeth 1a are provided on the upper surface of the bobbin holder 4, and the inside surrounded by the barrier 4b is an opening. Since the T-shaped protrusion 4a is provided on the lower side of the bobbin holder 4, the insulating material 2 is fixed by attaching the bobbin holder 4 from above.

  FIG. 4 is a lower perspective view of the bobbin holder 4. Projections 4a that engage with the projections 2a 'of the insulating material 2 exist between the openings.

  As shown in FIGS. 3 and 4, the bobbin holder 4 corresponds to each of the divided stator cores 1 and is assembled so that the division positions can be matched. For this reason, it can be assembled for each part of the stator core 1.

  FIG. 5 is a top view of the state in which the bobbin holder 4 is attached, and is an explanatory view of effects according to the configuration of the present embodiment. As shown in FIG. 5, a coil guide protrusion 2b is provided on the inner peripheral side of the stator winding 3 on the upper surface side of the stator and is provided on the extending portion 2a of the insulating material 2, and a bobbin holder 4 is further provided on the inner peripheral side. It is located (coil guide protrusion 2a will be described later).

  In FIG. 5, when an external force F <b> 1 is applied in a direction in which one of the bobbins 2 around which the stator winding 3 is wound is pulled out of the stator core 1, the T-shaped protrusion 2 a of the bobbin 2 and the protrusion of the bobbin holder 4. Since 4a is engaged, forces F2 and F3 in the same direction are applied to the bobbin holder 4. Further, the force F4 in the same direction is applied to the other seven bobbins 2, but the bobbin 2 can move only in the direction b along the teeth, and the moving direction of each bobbin 2 is different. The movement of the bobbin 2 that receives external force by the bobbin 2 is inhibited. For this reason, the bobbin 2 cannot escape.

  By adopting such a fixing method, there is no residual stress and it is not necessary to change the shape of the teeth, so it is possible to fix the bobbin (insulating material 2) without affecting the durability and magnetic properties. It becomes.

  Moreover, it is not necessary to make the tip of the tooth portion 1a wider than the width of the insulating material 2 in order to prevent the insulating material 2 from coming out of the stator core 1, and the design freedom of the tooth portion 1a is increased. .

  FIG. 6 shows an overall view of the stator when the central axis of the motor is horizontal. In the figure, the upper side means the vertical upper side. This motor is an outer rotor type. A rotor (not shown) is disposed on the outer peripheral surface of the stator, and the rotor is rotatably supported by a fixed support member (not shown) via a bearing (not shown). The rotor rotation surface is in the vertical direction, and is suitable for use in driving the rope in the vertical direction, such as an elevator hoist. When the motor is installed in the direction shown in FIG. 6, the force in the direction G1 in which the bobbin 2 comes out of the stator core 1 is always subjected to gravity, but the above-described configuration can prevent the bobbin 2 from coming off. Therefore, this embodiment is particularly effective for use as an elevator hoist. In this case, it is preferable that the rotor is also composed of a rotor core divided into a plurality of parts, and a magnet is arranged on the inner surface of the rotor core.

  FIG. 7 is an enlarged perspective view of the upper portion of the stator portion and shows the shape of the upper portion of the bobbin holder 4. In FIG. 7, a bolt 5 for fixing the stator core 1 to a frame (not shown) is provided, and an insulating barrier 4 b is provided on the upper surface of the bobbin holder 4 so as to cover the bolt 5. The bolt that penetrates in the stacking direction of the steel sheets of the stator core 1 protrudes from the upper surface of the stator core 1, but contact between the protruding portion (head) and the winding can be avoided by the barrier 4b. . Therefore, by adopting the barrier 4b and using the bobbin holder 4 as an insulating material, it is possible to prevent interference with the bolt 5 when the coil leg is arranged on the upper part of the bobbin holder 4, and to maintain the insulation distance. It becomes.

  That is, as already described, the extending portion 2a is provided on the upper side of the insulating material 2, and the coil guide protrusion 2b is provided inside the portion around which the stator winding 3 is wound. With this configuration, it is possible to avoid contact with the conductive portion (the head portion of the bolt 5) when the lead wire of the coil is pulled out toward the rotation center. The coil end portion of the stator winding 3 is drawn out to the side where the extending portion 2a is provided, and the coil guide protrusion 2b and the barrier 4b are provided so that the lead wire does not come into contact with the conducting portion. become.

  FIG. 8 is a perspective view showing a state in which a cover that covers the extending portion 2a and the bobbin holder 4 from above is attached. As shown in FIG. 8, a cover 6 is provided at the upper part of the bobbin holder 4 in the stacking direction, and the cover 6 and a frame (not shown) are fastened with bolts or the like at the hole 6a. By employing the cover 6, the bobbin holder 4 can be sandwiched and fixed from the upper and lower sides in the stacking direction, and the bobbin holder can be prevented from coming off in the upper part in the stacking direction.

  Further, by employing the cover 6, it is possible to prevent the coil legs disposed between the barrier walls 4b from being separated from the stator end surface. Of course, the coil legs can be insulated by forming the cover with an insulating material.

  DESCRIPTION OF SYMBOLS 1 ... Stator iron core, 1a ... Teeth part, 2 ... Insulating material (bobbin), 2a ... Extension part, 2a '... T-shaped protrusion, 2b ... Coil guide protrusion, 3 ... Stator winding, 4 ... Bobbin holder, 4a ... protrusion, 4b ... insulating barrier, F1-4 ... direction in which force is applied, b ... direction along the teeth, G1 ... direction of gravity, 5 ... bolt, 6 ... cover, 6a ... hole.

Claims (12)

A stator core having a plurality of teeth portions in the circumferential direction, a hollow insulating material that is wound around the stator winding and inserted into the teeth portions, and a plurality of the insulating materials fitted together to fix them. A bobbin holder that is fixed to the core,
The insulating material has a protrusion at the tip of the extending portion extending in the direction of insertion into the teeth portion,
The bobbin holder is fixed to one end face of the stator core, and meshes with the protrusions to fix the insulating material to the stator core . The electric motor according to claim 1, wherein at least two bobbin holders are integrally formed so as to follow a circumferential arrangement of the plurality of tooth portions. The insulating material is inserted so that the extending portion is aligned with one side end surface of the stator core, and the extending portion is disposed on the one side end surface,
Bolts passing through the rotation axis direction of the stator core before Symbol one end face, the head is provided so as to be positioned on the one end face of the stator core,
The electric motor according to claim 1, wherein the bobbin holder has a barrier that prevents contact between the head and the stator winding.   It has a cover which covers the bobbin holder from the direction of a rotation axis, and fixes the bobbin holder to the stator core by fixing the cover and a stator. The electric motor described in 1.   The electric motor according to any one of claims 2 to 4, wherein the bobbin holder is divided into a plurality in the circumferential direction.   The said stator iron core consists of a split iron core, The division | segmentation position of this stator core and the division | segmentation position of the circumferential direction of the said bobbin holder correspond, It is characterized by the above-mentioned. Electric motor.   The stator core has a plurality of tooth portions protruding on the outer circumferential side in the circumferential direction, and is an outer rotor type electric motor having a cylindrical rotor on the outer circumferential side of the teeth portion, and the rotor is The electric motor according to any one of claims 1 to 6, wherein the electric motor includes a rotor core divided into a plurality of parts, and a magnet is disposed on an inner surface of the rotor core.   The electric motor according to any one of claims 1 to 7, wherein the bobbin holder is made of an insulating resin. A bobbin holder in which a stator winding is wound and a hollow-shaped insulating material inserted into a tooth portion provided in a circumferential direction is fixed to a stator core,
A shape portion that meshes with a protrusion provided at the tip of an extending portion that extends in a direction to be inserted into the teeth portion of the insulating material;
A bolt hole for fixing a bolt to one side end face of the stator core is provided on an extension line in the insertion direction to the teeth portion and in a direction opposite to the teeth portion with the shape portion interposed therebetween. Bobbin holder.   The bobbin holder according to claim 9, further comprising a wall portion that is larger than a head diameter of the bolt and higher than a head height of the bolt around the bolt hole.   The bobbin holder according to claim 9 or 10, wherein at least two bobbin holders are integrally formed so as to follow a circumferential arrangement of the plurality of tooth portions.   The bobbin holder according to any one of claims 9 to 11, wherein the bobbin holder is made of an insulating resin.

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