JP5061788B2 - Stator - Google Patents

Description

  The present invention relates to a stator that constitutes a motor, and more particularly to a stator that includes an insulator that insulates a stator coater and a coil wound around a stator core.

  Generally, a motor is comprised by the cylindrical stator and the rotor provided in the inner peripheral side of a stator. The stator includes a stator core, a stator coil, and an insulator. A plurality of teeth are formed on the inner peripheral surface of the stator core, and a stator coil is attached to each tooth with an insulator as an insulator interposed. Therefore, it is necessary to fix the insulator to each tooth part. A technique for fixing each tooth portion and the insulator is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-136698 (Patent Document 1).

The stator disclosed in this publication includes a laminated body formed by laminating a plurality of thin plate materials made of a magnetic material. A plurality of teeth are provided on the inner peripheral side of the laminate. A concave engagement groove is formed in the vicinity of both ends of each tooth. Each tooth portion is provided with a resin bobbin (insulator) around which a coil is wound in advance. The bobbin includes a rectangular tube-shaped base portion having an internal space into which the tooth portion is fitted, and a flange portion that protrudes outward from both ends of the base portion. A convex portion is formed on the inner side surface of the base portion. The bobbin is forcibly pushed toward the tooth part so that the tooth part is inserted into the internal space of the base part, and the bobbin is firmly attached to the tooth part by fitting the convex part into the engagement groove of the tooth part. .
JP 2001-136698 A

  However, the stator disclosed in Patent Document 1 has the following problems because the engaging groove and the convex portion for fixing the insulator and the stator core are provided in the vicinity of the tip of the tooth portion. That is, if the distance from the outer peripheral side end of the insulator to the convex portion becomes shorter than the distance from the root portion of the tooth portion to the engaging groove in the stator core due to manufacturing variations and changes over time, the flange portion of the insulator and the stator core The adhesion between the stator coil and the stator core decreases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide adhesion between a stator core and an insulator in a stator including a stator core having tooth portions and an insulator attached to the tooth portions. It is providing the stator which can improve.

  A stator according to a first aspect of the invention covers a stator core having a hollow cylindrical main body portion, a tooth portion projecting from the inner peripheral surface of the main body portion toward the central axis of the main body portion, and the inner peripheral surface and the tooth portion. A thin plate-like insulator to be mounted on the tooth portion, a hollow cylindrical base portion that houses the tooth portion therein, and a flange portion that protrudes outward from the end portion of the base portion on the side separated from the central axis Including an insulator. A groove portion is provided at the end portion on the side away from the central axis of either the tooth portion or the base portion. At the end portion on the side separated from the central axis where the tooth portion and the groove portion of the base portion are not provided, a convex portion protruding toward the groove portion side is provided so as to be fitted to the groove portion.

  According to the first invention, the thin plate insulator is attached to the tooth portion protruding from the main body portion of the stator core. The insulator has a hollow cylindrical base portion that accommodates the tooth portion therein, and a flange portion that protrudes outside the base portion from the end portion of the base portion that is separated from the central axis. Provided at the end provided on the side separated from the central axis of one of the teeth and the base, and on the end provided on the side separated from the central axis not provided with the groove of the tooth and base. The stator core and the insulator are fixed by fitting the protruding portions. Thereby, compared with the case where a groove part and a convex part are provided on the tip side of the tooth part, for example, the distance from the inner peripheral surface of the main body part to the fitting part (groove part or convex part) of the tooth part and the base part The distance to the fitting part (convex part or groove part) is not affected by manufacturing variations or changes over time. Therefore, the distance from the inner peripheral surface of the main body portion to the flange portion is a distance corresponding to only the fitting tolerance between the groove portion and the convex portion. Thereby, the adhesiveness of the inner peripheral surface of a main-body part and a collar part can be improved. As a result, in a stator including a stator core having tooth portions and an insulator attached to the tooth portions, a stator capable of improving the adhesion between the stator core and the insulator can be provided.

  In the stator according to the second invention, in addition to the configuration of the first invention, the groove portion and the convex portion are provided in pairs one by one with the tooth portion interposed therebetween.

  According to the second invention, since the groove portion and the convex portion are provided in pairs with the tooth portion interposed therebetween, the adhesion between the inner peripheral surface of the main body portion and the collar portion can be improved on both sides of the tooth portion.

  In the stator according to the third invention, in addition to the configuration of the second invention, the groove portion is provided at the end portion of the tooth portion, and the distance between the groove portions is larger than the circumferential width of the tip portion of the tooth portion. Formed to be.

  According to 3rd invention, although a pair of groove part is provided in the edge part (root part) of a tooth part, the distance between groove parts is larger than the width | variety of the circumferential direction of the front-end | tip part of a tooth part. For this reason, it is possible to prevent the amount of magnetic flux of the stator from being extremely lowered by providing the groove portion in the tooth portion.

  In the stator according to the fourth invention, in addition to the configuration of the first invention, the groove portion is provided at an end portion of the tooth portion. A convex part is provided in the edge part of a base.

  According to 4th invention, a stator core and an insulator can be fixed by fitting with the groove part provided in the edge part of a tooth | gear part, and the convex part provided in the edge part of a base.

  In the stator according to the fifth aspect of the invention, in addition to the configuration of any one of the first to fourth aspects, the tooth portion has a central axis from the side where the width of the tooth portion in the circumferential direction of the main body portion is close to the central axis. It forms so that the side to separate may become large.

  According to the fifth invention, the tooth portion is formed such that the width of the tooth portion in the circumferential direction of the main body portion is larger on the side away from the side closer to the central axis. That is, the width on the tip side of the tooth portion is smaller than the width on the root side, and the insulator is easily removed from the tooth portion. In such a structure, the stator core and the insulator can be fixed by fitting the groove portion and the convex portion, thereby preventing the insulator from coming off.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1 and FIG. 2, the stator 10 of the electric motor which concerns on this Embodiment is demonstrated. FIG. 1 is a partial plan view of the stator 10 as viewed from above. Stator 10 includes a stator core 100, an insulator 200, a coil 300, and a bus bar 400.

  Stator core 100 is formed by laminating a plurality of magnetic steel plates. The stator core 100 includes a main body part 110 and a tooth part 120. The main body 110 is formed in a ring shape (hollow cylindrical shape) having a constant width over the entire circumference. A plurality of tooth portions 120 are provided on the inner peripheral surface of the main body portion 110 at a predetermined interval, and each protrudes toward the central axis side of the main body portion 110. The side surface of the tooth part 120 is such that the width of the tooth part 120 in the circumferential direction of the main body part 110 is larger on the side (root side) away from the central axis than the side (front end side) close to the central axis of the main body part 110. The main body 110 is inclined with respect to the radial direction.

  The insulator 200 is a resin member that is attached to each tooth portion 120 and insulates the stator core 100 from the coil 300. The insulator 200 is formed in a thin plate shape in consideration of securing the space of the coil 300 and improving thermal conductivity from the coil 300 to the stator core 100. The insulator 200 includes a base part 210 and a flange part 220.

  The base part 210 is formed in a substantially rectangular tube shape so as to accommodate the tooth part 120 therein. In accordance with the shape of the tooth portion 120, the side surface of the base portion 210 is inclined so that the width of the base portion 210 gradually increases in a direction from the side close to the central axis of the main body portion 110 toward the side away from the central axis. On the upper surface and the lower surface of the base portion 210, a bar material 212 that comes into contact with the coil 300 is provided near the center, and both sides of the bar material 212 are cut away.

  The flange 220 protrudes from the end of the base 210 on the side away from the central axis of the main body 110 to the outside of the base 210 along the inner peripheral surface of the main body 110. The main body 110 and the coil 300 are insulated by the flange 220.

  The coil 300 is mounted on each tooth portion 120 with the insulator 200 interposed therebetween. The coil 200 is formed by winding a conductive wire having a long side and a short side (or a long diameter and a short diameter) in a spiral shape with the radial direction of the main body 110 as a winding axis direction. The coil 300 is a coil (so-called edgewise coil) wound so that the short side of the conductor cross section is the inside and the long side is perpendicular to the winding axis. The coil 300 is wound so that the diameter gradually increases in a direction from the side close to the central axis of the main body 110 toward the side away from the central axis in accordance with the shape of the insulator 200. In addition, the winding method and shape of the coil 300 are not limited to these. Both ends of the coil 300 protrude upward along the central axis of the main body 110, bend toward the main body 110 at a predetermined position, and are connected to the terminal member 410 of the bus bar 400.

  The bus bar 400 is formed in a ring shape on the upper surface of the main body 110. Each bus bar 400 is provided with a plurality of grooves along the circumferential direction of the main body 110, and a terminal member 410 is provided in each groove corresponding to each coil 300. The terminal member 410 is joined to both ends of the coil 300 by welding or the like. Thereby, each coil 300 is electrically connected to another adjacent coil 300 with two coils 300 interposed therebetween, for example.

  FIG. 2 is a partially enlarged cross-sectional view of the stator core 100 and the insulator 200 in a state where the insulator 200 is mounted on the stator core 100.

  The root portion of the tooth portion 120 (the end portion of the tooth portion 120 on the side away from the central axis of the main body portion 110) extends substantially parallel to the axial direction of the main body portion 110 from the upper surface to the lower surface of the tooth portion 120. A pair of grooves 130 facing each other with 120 interposed therebetween is provided. The groove portion 130 is formed by cutting the tooth portion 120 in the circumferential direction of the main body portion 110, and the distance between the apexes of the groove portion 130 (that is, the circumferential width of the main body portion 110 at the root portion of the tooth portion 120) A. Is formed to be larger than the width B in the circumferential direction of the main body 110 at the tip of the tooth portion 120.

  On the other hand, at the end of the base 210 on the side separated from the central axis of the main body 110, the inner side of the base 210 on the groove 130 side (that is, the circumferential direction of the main body 110) so as to fit into the pair of grooves 130. A pair of convex portions 240 projecting from each other is provided.

  With reference to FIG. 3, a working method when the insulator 200 is mounted on the stator core 100 will be described.

  First, the insulator 200 is prepared closer to the central axis of the main body 110 than the teeth 120. At this time, the flange 220 is prepared so as to be on the stator core 100 side.

  Next, the insulator 200 is moved to the side away from the central axis of the main body 110 (in the direction of the arrow in FIG. 2) while the tooth portion 120 is inserted into the base portion 210. In the middle of moving the insulator 200, when the convex portion 240 comes into contact with the side surface of the tooth portion 120 and further moves the insulator 200, the insulator 200 gradually expands outward.

  When the insulator 200 moves to a position where the flange portion 220 comes into contact with the inner peripheral surface of the main body portion 110, the convex portion 240 is fitted into the groove portion 130. By this fitting, the enlarged insulator 200 returns to the original state, and the insulator 200 is fixed to the stator core 100. Thereby, the installation work of the insulator 200 is completed.

  In addition, when the convex part 240 fits into the groove part 130, the flange part 220 is bent along the inner peripheral surface in a state of being in contact with the inner peripheral surface of the main body part 110. As a result, a force acting on the flange portion 220 from the inner peripheral surface of the main body 110 in the central axis direction of the main body 110 (that is, the direction in which the insulator 200 is pulled out) is generated.

  An operation of stator 10 according to the present embodiment based on the above structure will be described. The stator core 100 and the insulator 200 are fixed by fitting the groove portion 130 provided in the tooth portion 120 of the stator core 100 and the convex portion 240 provided in the base portion 210 of the insulator 200.

  Here, the convex part 240 protrudes inside the base part 210 (circumferential direction of the main body part 110). That is, the convex part 240 protrudes in a substantially vertical direction with respect to the direction in which the insulator 200 is pulled out (the radial direction of the main body part 110). Therefore, even if a force in the pulling direction is generated from the inner peripheral surface of the main body 110 to the flange portion 220, the pulling out of the insulator 200 can be suppressed. In particular, in the present embodiment, since the side surface of the tooth portion 120 is inclined so that the width on the tip side of the tooth portion 120 is smaller than the width on the root side, the insulator 200 is easily removed. Even in such a structure, it is possible to appropriately prevent the insulator 200 from coming off.

  Furthermore, the groove part 130 is provided at the root part of the tooth part 120. The convex portion 240 is provided at an end portion of the base portion 210 on the side separated from the central axis of the main body portion 110. Thereby, for example, compared with the case where the groove part 130 and the convex part 240 are provided on the distal end side of the tooth part 120, the radial distance of the main body part 110 from the inner peripheral surface of the main body part 110 to the groove part 130 and the flange part 220. The radial distance of the main body 110 to the convex part 240 is not affected by manufacturing variations or changes over time. Therefore, the distance from the inner peripheral surface of the main body 110 to the flange portion 220 is a distance corresponding to only the fitting tolerance between the groove portion 130 and the convex portion 240. Thereby, the adhesiveness of the collar part 220 and the main-body part 110 improves, and the heat conductivity from the collar part 220 to the main-body part 110 improves. Therefore, most of the heat of the coil 300 can be transmitted to the main body 110 without passing through the tooth portion 120, and the cooling efficiency of the coil 300 can be improved.

  Furthermore, although the insulator 200 is a resin-made thin plate, by providing the convex part 240, the thickness of the part which the base 210 and the collar part 220 contact increases, and rigidity is improved. Thereby, even when the load is concentrated on the portion where the base 210 and the flange 220 are in contact with each other by the base 210 and the flange 220 being pressed against the inner peripheral surface of the main body 110 when the insulator 200 is mounted, It can suppress that the part which the collar part 220 touches deform | transforms. Further, since the restriction on the moving load of the insulator 200 during the mounting operation is reduced, the mounting workability of the insulator 200 is improved.

  By the way, since the groove part 130 is formed by cutting out the tooth part 120, the width of the root part of the tooth part 120 becomes narrow. In general, the output torque of the electric motor varies depending on the amount of magnetic flux of the stator 10 and the rotor. The amount of magnetic flux of the stator 10 is proportional to the product of the magnetic flux density of the tooth portion 120 and the width of the tooth portion 120. Further, the magnetic flux density of the tooth portion 120 is proportional to the product of the number of turns of the coil 300 and the current value flowing through the coil 300. Therefore, if the number of turns of the coil 300 and the current value flowing through the coil 300 are the same, when the width of the tooth portion 120 is narrowed, the output of the electric motor is reduced.

  However, in the present embodiment, the groove portion 130 is provided at the root portion of the tooth portion 120, and the distance A between the apexes of the groove portion 130 is larger than the circumferential width B of the main body portion 110 at the tip portion of the tooth portion 120. . Thus, by providing the groove part 130 in the root part of the tooth part 120, the width of the root part of the tooth part 120 can be made larger than at least the width of the tip part of the tooth part 120. Therefore, it is possible to prevent the amount of magnetic flux of the stator 10 (that is, the output of the motor) from being extremely reduced by providing the groove portion 130.

  As described above, according to the stator according to the present embodiment, the groove portion provided at the root side end portion of the tooth portion protruding from the stator core is fitted with the convex portion provided at the stator core side end portion of the insulator. By doing so, the stator core and the insulator are fixed. Thereby, compared with the case where a groove part and a convex part are provided in the front-end | tip side of a tooth | gear part, the distance of the collar part of an insulator and the main-body part of a stator core becomes difficult to receive to the influence of manufacturing dispersion | variation and a time-dependent change. Thereby, since the adhesiveness of the collar part of an insulator and a stator core can be improved, the thermal conductivity from an insulator to a stator core can be improved.

  In the present embodiment, the case where the width of the tooth portion 120 of the stator core 100 is larger on the side (root side) away from the central axis than the side (tip side) close to the central axis of the main body 110 has been described. The shape of the teeth of the stator core according to the present invention is not limited to this. For example, the width of the tooth portion of the stator core may be substantially the same from the root side to the tip side.

  Further, in the present embodiment, the case where the groove portion 130 is provided on both sides of the tooth portion 120 of the stator core 100 has been described. However, in the stator according to the present invention, the groove portion 130 is limited to be provided on both sides of the tooth portion 120. For example, the groove part 130 may be provided only on one side of the tooth part 120.

  Further, in the present embodiment, the case where the groove portion 130 and the convex portion 240 extend substantially parallel to the axial direction of the main body portion 110 from the upper surface to the lower surface of the tooth portion 120 has been described. However, in the stator according to the present invention, the groove portion The shape of 130 and the convex part 240 is not limited to this. For example, the groove part 130 and the convex part 240 may be provided in a small range between the upper surface and the lower surface of the tooth part 120.

  In the present embodiment, the case where the groove portion 130 is provided in the tooth portion 120 of the stator core 100 and the convex portion 240 is provided in the base portion 210 of the insulator 200 has been described. However, in the stator according to the present invention, the groove portion 130 is provided. May be provided on the base portion 210 of the insulator 200, and the convex portion 240 may be provided on the tooth portion 120 of the stator core 100.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a fragmentary top view at the time of seeing the stator which concerns on embodiment of this invention from the upper side. It is a partial expanded sectional view of a stator core and an insulator in the state where an insulator concerning an embodiment of the invention was attached to a stator core. It is a figure for demonstrating the working method at the time of mounting | wearing the stator core with the insulator which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Stator, 100 Stator core, 110 Main-body part, 120 Tooth part, 130 Groove part, 200 Insulator, 210 Base part, 212 Bar material, 220 collar part, 240 Convex part, 300 Coil, 400 Bus bar, 410 Terminal member.

Claims (4)

A stator core having a hollow cylindrical main body portion, a tooth portion protruding from the inner peripheral surface of the main body portion toward the central axis of the main body portion, and the tooth portion so as to cover the inner peripheral surface and the tooth portion A thin plate-like insulator to be mounted, wherein a hollow cylindrical base portion that houses the tooth portion therein, and a flange portion that protrudes outward from the end portion of the base portion on the side separated from the central axis A stator including an insulator,
The portions of the teeth and the inner circumferential surface is in contact of the body portion and the tooth portion, the groove is provided,
A stator in which a convex portion that protrudes toward the groove portion so as to be fitted to the groove portion is provided at a portion of the base portion where the base portion and the flange portion are in contact.   The stator according to claim 1, wherein the groove part and the convex part are provided in pairs with the tooth part interposed therebetween.   The stator according to claim 2, wherein the groove portions are formed such that a distance between the groove portions is larger than a width in a circumferential direction of a tip portion of the tooth portion.   The tooth portion is formed such that a side of the tooth portion in the circumferential direction of the main body portion is spaced apart from the central axis from a side closer to the central axis. The stator described.

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