JP2010141981A - Insulator for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat radiation performance in an insulator for a rotating electric machine. <P>SOLUTION: The insulator 30 for an rotating electric machine includes a body 32, a portion composed of four members 34, 36, 38 and 40 protruding from the body 32 to the front side, and two pairs of three members 42, 44 protruding to the back of the body 32. The body 32 has a rectangular opening portion 46 on its center. The four members 34, 36, 38, 40 each have the function of a side surface covering portion of a core 16, and the body 32 has the function of an end surface covering portion of the core 16. With these functions, the insulator 30 has the function as an insulation separating portion. The two pairs of three protruding members 42, 44 protruding to the back of the body 32 are heat radiation fins. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an insulator for a rotating electrical machine, and more particularly to an insulator for a rotating electrical machine used for a rotating electrical machine having a core and a coil winding.

  When a coil is wound around a core of a rotating electrical machine, an insulator formed of an insulating material such as an insulating sheet is provided between the core and the coil in order to ensure insulation between the core and the coil.

  For example, in Patent Documents 1 and 2, a stator core formed by laminating thin steel plates, a plurality of slots extending in the axial direction of the stator core, and an electrical insulation sheet made of an electrical insulation material on the inner surface of the slot Slot insulation, including a slot insulation formed by inserting a wire and winding a wire multiple times, passing through the slot insulation, and a stator coil mounted so as to protrude from both ends of the stator core. However, it is disclosed that it is comprised by the electrical insulation sheet which provided the corrugated unevenness | corrugation on the surface. Thus, when the resin is immersed, the resin is well filled between the electrical insulating sheet and the slot, and it is stated that the insulation performance such as a dielectric breakdown voltage and the heat conduction state are stabilized.

  As a technique related to the present invention, Patent Document 3 discloses, as a flat wire winding structure, a plurality of rectangular pieces corresponding to a plurality of columns through insulating caps in order to eliminate the part of the column changing and layer changing. A configuration is disclosed in which a wire is wound at the same time and the start and end of adjacent rectangular wires are connected.

JP 2004-320953 A JP 2005-86852 A JP 2002-291186 A

  The insulator contributes to ensuring insulation between the core and the coil. However, as pointed out in Patent Document 1, for example, in the case of a resin mold type rotating electrical machine, there is an insulator, so that resin flows in. It may be obstructed and an air layer may remain in the resin mold. When the rotating electrical machine operates, heat is generated. However, if air remains in the resin mold in this way, the heat dissipation performance decreases. Further, even in a general rotating electric machine that is not resin-molded, an insulator, which is an insulator, is inferior in heat dissipation because it has poor thermal conductivity compared to metal.

  The objective of this invention is providing the insulator for rotary electric machines which can improve heat dissipation.

  An insulator for a rotating electrical machine according to the present invention is an insulator used for a rotating electrical machine having a core and a coil winding, and is integrated with an insulating separation portion disposed between the core and the coil winding. And a heat radiating portion formed so as to be in contact with at least one of the core or the coil winding and having a heat radiating fin.

  In the insulator for a rotating electrical machine according to the present invention, when the core has a ring-shaped core main body and a teeth portion protruding from the core main body toward the inner diameter side, an opening through which the protrusion of the tooth portion is passed from the front end side And a main body portion that is abutted against the core main body portion through the protrusion of the teeth portion, and a plurality of heat dissipating fin portions that protrude from the surface of the main body portion on the core main body portion side. It is preferable to include a side surface covering portion that extends from the main body portion along the protrusion of the tooth portion and covers the upper, lower, left, and right side surfaces of the tooth portion.

  Further, in the insulator for a rotating electrical machine according to the present invention, the side surface covering portion has a corrugated unevenness on at least one of the core contact surface that contacts the core or the coil contact surface that is the back side of the core contact surface and contacts the coil winding. It is preferable to have a part.

  Further, in the insulator for a rotating electrical machine according to the present invention, the side surface covering portion is formed with corrugated irregularities corresponding to the outer shape of each wire of the coil winding on both sides of the plate thickness, and the coil contact surface It is preferable that a gap can be formed by contacting along the outer shape of the winding and making a line contact with the core contact surface at the tip of the unevenness between the core contact surface and the core.

  With the above configuration, the insulator for the rotating electrical machine is formed so as to be integrated with the insulating separation portion disposed between the core and the coil winding, and to be in contact with at least one of the core or the coil winding, And a heat dissipating part having heat dissipating fins. When the rotating electrical machine generates heat by the heat radiating portion, the heat can be easily radiated to the outside, and the heat radiation can be improved while being an insulator.

  Further, in the insulator for a rotating electrical machine, when the core has a ring-shaped core main body portion and a tooth portion protruding from the core main body portion toward the inner diameter side, the heat radiating portion has an opening through which the protrusion of the tooth portion is passed from the front end side; It has a main body part that is abutted against the core main body part through the protrusion of the teeth part, and a plurality of heat dissipating fin parts that protrude from the surface of the main body part on the core main body side. That is, since the heat radiating fin protrudes toward the core main body side, it hardly affects the operation of the rotating electrical machine. In addition, since the insulating separation part extends from the main body part of the heat radiating part along the protrusion of the tooth part and includes side surface covering parts that cover the upper, lower, left and right sides of the tooth part, a sufficient gap is provided between the core and the coil winding. Can be insulated.

  In the insulator for a rotating electrical machine, the side surface covering portion has a corrugated uneven portion on at least one of a core contact surface that contacts the core or a coil contact surface that is on the back side of the core contact surface and contacts the coil winding. For example, when the core, coil winding, and insulator are resin-molded like a resin-molded rotating electrical machine, the resin easily flows along the corrugated irregularities, so that an air layer remains in the resin mold. It can be suppressed and heat dissipation can be improved.

  Further, in the insulator for a rotating electrical machine, the side surface covering portion has corrugations corresponding to the outer shape of each wire of the coil winding formed on both sides of the plate thickness, and the outer shape of the coil winding on the coil contact surface. And a line contact is made between the core contact surface and the core at the tip of the unevenness to form a gap. For example, when a core, a coil winding, and an insulator are resin-molded like a resin mold type rotating electrical machine, the coil winding contacts along the coil contact surface of the insulator, and the insulator makes a line contact with the core, Forms a gap that is easy to flow. Therefore, when the resin molding is performed, the coil winding, the insulator, the resin, and the core are in close contact with each other and no air layer remains, thereby further improving heat dissipation.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a resin mold type rotating electrical machine will be described, but this will further explain an example in which the heat dissipation can be further improved, and the insulator according to the present invention is used even in a general rotating electrical machine that is not a resin mold type. Can sufficiently improve heat dissipation. In the following, the coil winding is described as winding a rectangular wire in an edgewise manner, but this is described as an example of a coil winding that is easy to position, and other types of coil windings. A coil winding, for example, a coil winding having a circular cross section may be used. In the following, the insulator is described as a resin integrated structure, but a configuration in which a plurality of parts are combined may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating a configuration of a stator 10 of a rotating electrical machine that uses an insulator 30. FIG. 2 is an enlarged view of a portion A in FIG. A stator 10 of a rotating electrical machine includes a fixing ring 12 and a stator body 14 fixedly supported by the fixing ring. The stator main body 14 includes a core 16 that is a magnetic body and a coil winding 26 that is wound around the core 16. The stator 10 includes a bus bar 22 that connects each lead wire from the coil winding 26 and an external terminal 24 that is connected to the bus bar 22. The stator 10 is a resin mold type stator which is molded with an appropriate resin as a whole after the form shown in FIG. 1. In this sense, FIG. 1 is a view showing the form of the stator subassembly. .

  The core 16 is a core main body portion 18 called a back yoke having an annular outer periphery, and further has a plurality of teeth portions 20 protruding from the annular back yoke to the inner peripheral side. The number of teeth portions 20 is set according to the specifications of the stator 10, and 18 teeth portions 20 are shown in the example of FIG. Coil windings 26 are wound around the teeth portion 20 via an insulator 30. As described above, the core 16 has a complicated inner peripheral shape including a plurality of teeth portions 20 for coil winding, and in order to obtain a predetermined output as a rotating electric machine, the core 16 has a predetermined axial direction. It has a thickness. As the core 16, a plurality of electromagnetic steel sheets punched out in a predetermined shape and laminated to have a predetermined thickness can be used. For punching, press working can be used.

  The coil winding 26 is obtained by winding a rectangular wire around each tooth portion 20 of the stator 10. The winding method is a concentrated winding in which each tooth portion 20 is sequentially laminated from the winding start portion 29 toward the winding end portion 28 along the protruding direction and wound by a predetermined number of turns. A flat wire is a wire in which the outer periphery of a conductor wire having a substantially rectangular cross section is appropriately insulated. In the example of FIG. 2, the short side of the rectangular shape is wound so as to be in contact with the surface of the tooth portion 20 of the core 16. This winding method is a method called an edgewise type. The edgewise type arrangement is compared to a so-called flatwise type in which the long side of the rectangular shape of the flat wire is wound so as to be in contact with the surface of the tooth portion 20 of the core 16, or compared to a wound coil having a circular cross section. And it can wind, setting the arrangement position with respect to the core 16 comparatively stably.

  The insulator 30 has a function to electrically insulate between the core 16 and the coil winding 26 and can be integrally formed of a resin material having an appropriate insulation performance. A detailed configuration of the insulator 30 will be described with reference to FIGS. 3 to 6. FIG. 3 is a four-sided view of the insulator 30. FIG. 4 is a view showing a state in which the insulator 30 is fitted into the core 16 in correspondence with the four views of FIG. FIG. 6 is a view for explaining the state of the cross section of the side surface covering portion constituting the insulator 30. FIG. 5 is a diagram showing a state in which the coil winding 26 is wound around the core 16 via the insulator 30 corresponding to the four views of FIG. Therefore, in terms of the procedure for manufacturing the stator 10, the insulator 30 shown in FIG. 3 is prepared, and this is inserted into the core 16 to obtain the state shown in FIG. 4, and then the coil winding 26 is wound to obtain the state shown in FIG. Proceed in order.

  As shown in FIG. 3, the insulator 30 includes a main body portion 32, three portions 34, 36, 38, and 40 extending forward from the main body portion 32, and three rear portions of the main body portion 32. Each set includes two sets of protruding members 42 and 44. Further, the main body 32 has a rectangular opening 46 at the center thereof.

  The opening 46 provided in the central portion of the main body 32 is for passing the teeth portion 20 called the teeth of the core 16 from the tip side. Here, when the tooth portion 20 of the core 16 is passed through the opening 46 of the main body portion 32, the core main body portion 18 that is the back yoke of the core 16 hits the main body portion 32. In this state, the direction in which the teeth portion 20 protrudes from the main body portion 32 is the front side, and the side where the core main body portion 18 abuts against the main body portion 32 is the rear side.

  When the coil winding 26 is wound around the core 16 via the insulator 30, the main body 32 covers the inner peripheral side end surface of the core main body 18 of the core 16 and is insulated from the coil winding 26. It has a function to ensure. In that sense, the main body portion 32 can be referred to as an end surface covering portion.

  The four members 34, 36, 38, and 40 are arranged along the four sides of the teeth portion 20 when the teeth portion 20 of the core 16 is passed through the opening 46. When the coil winding 26 is wound around the core 16 via the insulator 30, the four members 34, 36, 38, and 40 cover the teeth portion 20 of the core 16 and the coil winding 26. It has a function to ensure insulation between. In that sense, these four members 34, 36, 38, and 40 can be referred to as side surface covering portions.

  As described above, in the insulator 30, the four members 34, 36, 38, and 40 have the function of the side surface covering portion of the core 16, and the main body portion 32 has the function of the end surface covering portion of the core 16. With these functions, the insulator 30 has a function as an insulating separation part.

  More specifically, the four members 34, 36, 38, and 40 are disposed at the edge of the opening 46, and the teeth portion 20 is formed in the opening 46. When inserted, the four members 34, 36, 38, 40 are arranged so that the surfaces of the four members 34, 36, 38, 40 facing the teeth portion 20 are just in contact with each other.

  Here, as can be seen with reference to FIG. 4, the members 34 and 36 disposed on both side surfaces of the tooth portion 20 in the direction along the axial direction of the core 16 are longer than the height in the axial direction of the tooth portion 20. Have dimensions. That is, the members 34 and 36 are arranged so as to protrude vertically from both side surfaces of the tooth portion 20. On the other hand, the members 38 and 40 disposed on the upper and lower surfaces of the tooth portion 20 in the direction along the radial direction of the core 16 have a dimension shorter than the width dimension that is the circumferential length of the tooth portion 20. ing.

  That is, when the tooth portion 20 is inserted into the opening 46 of the insulator 30, both side surfaces of the tooth portion 20 are completely covered with the members 34 and 36, but the upper and lower surfaces of the tooth portion 20 are covered with the members 38 and 40. A part will be covered.

  Here, the upper and lower surfaces of the tooth portion 20 are not completely covered by the members 38 and 40 and there are exposed portions, but the members 34 and 36 disposed on both side surfaces of the tooth portion 20 are larger than the outer shape of the tooth portion 20. Since the members 38 and 40 protrude in the height direction in which the members 38 and 40 are disposed, the coil winding 26 does not contact the teeth portion 20. This is shown in FIG. That is, the coil winding 26 is wound along the members 34 and 36 that cover both side surfaces of the tooth portion 20, and when moving in the direction of the members 38 and 40, the members 34 and 36 are more than the outer shape of the tooth portion 20. Since it overhangs, the coil winding 26 is wound in the direction of the members 38 and 40 without contacting the upper and lower surfaces of the tooth portion 20.

  Thus, in the insulator 30, the part which covers the teeth part 20 of the core 16 is not an integral frame body, but is the four members 34, 36, 38 and 40 separated from each other. Since these four members 34, 36, 38, and 40 extend from the main body 32 like cantilever beams, they have appropriate elasticity. Due to this elasticity, the four members 34, 36, 38, 40 can apply an appropriate pressing force to each side surface of the tooth portion 20 of the core 16 inserted into the opening 46. It is possible to appropriately follow the variation of. In the case of an integral frame body, the frame body has a considerable rigidity, and therefore it may be difficult to follow the variation in the shape of the tooth portion 20. For example, when the outer shape of the tooth portion 20 is smaller than that of the opening 46, a gap is formed between the frame body and the tooth portion 20, and the coil winding 26 remains outside the frame body with the gap remaining. Will be wound on.

  Two sets of protruding members 42 and 44, each having three sets on the rear side of the main body 32, have a function of dissipating heat of the core 16 and the coil winding 26 to the outside through the insulator 30. It is. As shown in FIGS. 4 and 5, a plurality of members 42 and 44 are arranged so as to sandwich the upper and lower surfaces of the core body 18 of the core 16. In the example of FIGS. 3 to 5, as described above, three are disposed on the upper surface side and three on the lower surface side of the core body 18. Of course, the number of arrangements may be other than this.

  The insulator 30 having the above configuration can be obtained by integral molding using a resin material having appropriate heat resistance and insulation. The insulator 30 obtained by integral molding is fitted into the opening 46 from the front end side of the 18 teeth 20 of the stator body 14 described in FIG. 1, and the inner periphery of the annular core body 18. Positioned against the side. This is shown in FIG. Then, the winding start portion 29 is formed along the protruding direction of the teeth portion 20 through the insulator 30 so as to go around the outer shape of the four members 34, 36, 38, and 40 using a flat wire and being edgewise. Are sequentially stacked from the winding end portion 28 toward the winding end portion 28 and wound by a predetermined number of turns. This is shown in FIG.

  FIG. 6 is a cross-sectional view taken along the line CC in FIG. 5 and is a view for explaining the cross-sectional shapes of the members 34 and 36 that are side cover portions of the insulator 30 in particular. 6A shows the cross-sectional shape of the flat wire 27 and the cross-sectional shapes of the members 34 and 36, and an enlarged view of the portion B is shown in FIG. 6B on the right side.

  As shown in FIG. 6 (b), the rectangular wire 27 is actually formed by crushing a round conductor wire having a circular cross section, so that the cross sectional shape is not a perfect rectangular shape. The part has an appropriate arc shape. For example, if the length of the short side of the flat wire is d, it has an arc shape with a radius R of about 0.6d to 0.8d.

  In the members 34 and 36, corrugated irregularities corresponding to the outer shape of the flat wire 27 which is each element wire of the coil winding 26 are formed on both sides of the plate thickness. Here, the surface where the members 34, 36 face the flat wire 27 of the coil winding 26 is the surface of the members 34, 36, and the surface where the members 34, 36 face the teeth portion 20 of the core 16 is the back surface of the members 34, 36. To do.

  Corresponding to the radius R of the flat wire 27, the surfaces of the members 34 and 36 have a corrugated uneven shape in which a concave portion having a pitch d and a radius R is repeated. As a result, the end portion of the flat wire 27 wound in an edgewise manner and facing the core 16 can contact the surfaces of the members 34 and 36 without a gap. In that sense, the surfaces of the members 34 and 36 are coil contact surfaces that contact along the outer shape of the coil winding 26.

  The back surfaces of the members 34 and 36 also have a corrugated irregular shape corresponding to the corrugated irregular shape on the front surface. As a result, the back surfaces of the members 34 and 36 can be brought into contact with the flat surface of the tooth portion 20 of the core 16 by a line contact while having a gap formed at an uneven pitch. In that sense, the back surfaces of the members 34 and 36 are core contact surfaces that contact along the outer shape of the core 16.

  The repetitive gap 50 formed between the core contact surface which is the back surface of the members 34 and 36 and the core 16 is used as a space in which resin flows and is filled when the stator 10 is resin-molded. That is, the repeated gap 50 is a resin filling gap. Since the repeated gap 50 is formed so as to penetrate along the axial direction of the stator 10, it is expected that the resin flow is further improved when the resin filling is performed along the axial direction of the stator 10. The

  In the example of FIG. 6B, the back surface has a corrugated uneven shape in which the concave portion having the pitch d and the radius R repeats similarly to the front surface. In this case, on both the front and back sides of the plate thickness, when the front side is concave, the back side is convex.When the front side is convex, the back side is concave. it can. As described above, the concave and convex shapes on the back surfaces of the members 34 and 36 are for filling the resin, and therefore may be different from the concave and convex shapes on the front surface. In some cases, the concave and convex shapes may be provided only on one side of the front and back sides of the members 34 and 36. For example, even if the concave and convex shape is provided only on the back side, the resin flows through this repeated gap and is sufficiently filled.

  Since the surfaces of the members 38 and 40 of the insulator 30 face the coil winding 26 and the back surface faces the core 16, as in the members 34 and 36, an uneven shape along the shape of the rectangular wire 27 is formed on the front surface. In addition, an appropriate uneven shape can be formed.

  As described above, by forming a suitable uneven shape on both sides of the plate thickness of the members 34, 36, 38, and 40 of the insulator 30, the resin is sufficiently filled when the stator 10 is resin-molded. be able to. If the resin is not sufficiently filled, air remains in the resin, and heat is not sufficiently released when the stator 10 generates heat. As described with reference to FIG. 6, the repeated gap 50 is formed between the tooth portion 20 of the core 16 and the insulator 30, so that the resin can flow through the repeated gap 50 and the resin is sufficiently filled. , Heat dissipation can be improved. FIG. 7 is a view showing a state of the resin-molded stator 60. Here, the stator main body 14 is embedded in the resin mold portion 62 including the core 16, the insulator 30, and the coil winding 26.

It is a figure explaining the structure of the stator of the rotary electric machine using the insulator of embodiment which concerns on this invention. It is an enlarged view of the A section of Drawing 1, and is a figure showing the appearance of the circumference of one insulator. It is a four-plane figure of the insulator of an embodiment concerning the present invention. It is a figure which shows a mode that the insulator of embodiment which concerns on this invention was inserted in the core corresponding to the four-plane figure of FIG. It is a figure which shows a mode that the coil winding was wound around the core via the insulator of embodiment which concerns on this invention corresponding to the four-plane figure of FIG. It is a figure explaining the mode of the section of the side cover part which constitutes the insulator of the embodiment concerning the present invention. It is a figure which shows the mode of the stator resin-molded using the insulator of embodiment which concerns on this invention.

Explanation of symbols

  10, 60 stator, 12 fixing ring, 14 stator body, 16 core, 18 core body, 20 teeth, 22 bus bar, 24 external terminal, 26 coil winding, 27 rectangular wire, 28 winding end, 29 winding start Part, 30 insulator, 32 body part, 34, 36, 38, 40, 42, 44 member, 46 opening part, 50 repetitive gap, 62 resin mold part.

Claims (4)

An insulator used for a rotating electrical machine having a core and a coil winding,
An insulation separator disposed between the core and the coil winding;
A heat dissipating part which is integrated with the insulating separation part and is formed so as to be in contact with at least one of the core or the coil winding;
An insulator for a rotating electrical machine characterized by comprising: The insulator for a rotating electrical machine according to claim 1,
When the core has a ring-shaped core main body portion and a tooth portion protruding from the core main body portion toward the inner diameter side, an opening through which the protrusion of the tooth portion passes from the tip end side;
A body part that is abutted against the core body part through the protrusion of the teeth part;
A plurality of heat dissipating fin portions protruding from the surface of the main body portion on the core main body portion side, and
Have
The insulator for a rotating electrical machine is characterized in that the insulating separation portion includes a side surface covering portion that extends from the main body portion of the heat radiating portion along the protrusion of the tooth portion and covers the upper, lower, left, and right side surfaces of the tooth portion. The insulator for a rotating electrical machine according to claim 1,
The insulator for a rotating electrical machine, wherein the side surface covering portion has a corrugated uneven portion on at least one of a core contact surface that contacts the core or a coil contact surface that is in contact with the coil windings on the back side of the core contact surface. . The insulator for a rotating electrical machine according to claim 3,
The side cover has corrugations corresponding to the outer shape of each wire of the coil winding on both sides of the plate thickness, and contacts the coil winding surface along the outer shape of the coil winding. An insulator for a rotating electrical machine, characterized in that a gap can be formed by making line contact with a core at the tip of an uneven surface.

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