JP2008278699A - Split stator and stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core, a split core and a stator in which insulation is not impaired by damage on the winding, a clearance is not produced between the split cores, winding does not collapse easily and a nozzle can traverse easily. <P>SOLUTION: The split stator comprises the cores 3, 5 and 6 of a coil, an insulator 7 covering the core, and a winding 1 wound around the core while interposing the insulator to form a coil. On the cross-section intersecting the axis of the coil perpendicularly, at least one of four corners on the contour of the core is beveled and each R is not identical at four corners. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a split stator and a stator, and more specifically to a split stator and a stator of a molded motor used in an automobile or the like.

  Since electric motors used in automobiles are mounted on automobiles, not only high output and high efficiency are naturally required, but also miniaturization and weight reduction are significantly required compared to other applications. For this reason, weight reduction and reduction are continuously performed without lowering the output but rather increasing the output. Among these motors for automobiles, the use of mold motors is increasing because the heat dissipation of heat generated by windings and the like is actually enhanced by mold resin. And since motors used in automobiles are constantly required to have higher efficiency, smaller size, and lighter weight, temperature rise is always a problem with them, and mold motors are required to further improve heat dissipation. I came.

As a molded motor having higher heat dissipation, a motor having a stator (stator) having the following structure has been proposed. That is, in an annular integral mold motor in which the outer side of an annular stator core formed by winding a coil is resin molded, a plurality of flat portions are formed on the outer periphery of the annular resin mold, and the annular integral resin A proposal has been made for a method of continuously forming a plurality of concave grooves on the outer flat portion of the mold and on both sides thereof (Patent Document 1). According to this measure, since the mold resin is reduced in thickness or deleted in a lattice shape or parallel groove shape outside the winding of the stator core, heat dissipation can be improved.
Japanese Patent Laid-Open No. 8-98441

  However, the heat dissipation of the molded motor is insufficient for current and future automotive mold motors, and the development of a molded motor with improved heat dissipation has been desired. An object of this invention is to provide the mold motor which improved heat dissipation further.

  The split stator of the present invention is a split stator that is a constituent element of the stator located on the outer peripheral side of the rotor. The split stator includes a main body having a winding wound around a core and a resin mold that covers the main body, and the resin mold is provided with a groove.

  With this configuration, a groove is attached to the resin mold in units of divided stators (segments), so the lubricating / hydraulic oil urged toward the stator by rotation of the rotor enters the grooves and cools each divided stator. Can act. For this reason, the heat dissipation of the whole stator can be further strengthened.

  Moreover, said groove | channel can be provided in the coil side surface of a division | segmentation stator. As a result, the groove is located between a certain divided stator and the adjacent divided stator, so that the lubricating / working oil enters the position where the sway is radially divided. For this reason, a powerful heat radiation path is formed so as to divide the stator, the stator is thermally subdivided, and the heat radiation performance is greatly improved.

  The groove may have an open end on an inner peripheral surface that is a surface facing the rotor. Thereby, the lubricating / working oil urged toward the stator side by the rotation of the rotor easily enters the groove from the opening end of the inner peripheral surface and easily enters the coil side surface.

  The groove may have an open end on the coil end surface and communicate with the inner peripheral surface and the coil end surface. With this configuration, the lubricating / working oil that has entered the groove from the opening end of the inner peripheral surface travels in the groove on the coil side surface and is discharged from the opening end of the coil end surface. That is, the lubrication / working oil circulates through the path of (open end of the inner peripheral surface → groove of the coil side surface → open end of the coil end surface → non-existing portion of the stator) by the rotation of the rotor. Since the above heat dissipation path is formed on both coil side surfaces of each divided stator, a heat dissipation path having a very large heat dissipation performance is formed for each divided stator so as to thermally divide the stator. As a result, the heat dissipation of the entire stator is greatly improved, and the temperature rise can be greatly suppressed.

  Further, in a cross section of the stator core (axis), in the first inner peripheral corner where one of the two coil side surfaces of the split stator intersects the inner peripheral surface, (A1) the first inner peripheral side The corner portion can have a shape that shortens the inner peripheral surface.

  According to the configuration of (A1), the corner portion of the first inner peripheral side corner portion recedes, and the second divided stator (which may be upstream or downstream of the rotor rotation) is the first. A space is created between the first inner peripheral corner portion and the second inner peripheral corner portion. For this reason, the lubricating / working oil urged by the rotation of the rotor is likely to remain in the space and be taken into the opening groove, depending on the surrounding conditions. Therefore, it becomes easy to obtain higher heat dissipation performance. Here, when the first inner peripheral corner portion is assembled to the motor, the first inner peripheral corner portion is positioned on the upstream side of the rotor, even if it is positioned on the rotation downstream side of the rotor with respect to the second inner peripheral corner portion forming a pair. It may be located. However, when it is positioned on the downstream side, the coil side surface of the second corner portion of the adjacent split stator on the downstream side can easily receive the lubricating / hydraulic oil flowing by the rotation of the rotor and introduce it into the groove. The effect of becoming can be obtained. Further, when the first inner peripheral corner portion is arranged on the upstream side of the divided stator, the lubricating / working oil is disposed on the rotor side (axial core side) of the space where the first inner peripheral corner portion is retracted. Since it rotates at a high speed, the pressure is reduced from the coil end surface side in the space, and the lubricating / working oil is circulated so as to be drawn from the coil end surface side to the inner peripheral surface side. The direction of movement of the lubrication / hydraulic oil in the groove depends on the shape of the inner surface of the housing of the motor, the shape of the rotor, and the like.

  Further, in the above-described stator axial cross section, in the first inner peripheral corner where one of the two coil side surfaces of the divided stator intersects the inner peripheral surface, (A2) the first inner peripheral corner The coil side surface of the part can be bent so as to shorten the inner peripheral surface and intersect the inner peripheral surface.

  Also in the configuration of (A2), as in the case of (A1), the corner portion of the first inner peripheral side corner recedes, and the second inner peripheral corner of the adjacent divided stator A space is created between parts. For this reason, the lubricating / working oil urged by the rotation of the rotor is likely to remain in the space and is easily taken into the groove opening in the space, depending on the mechanical conditions with respect to the surrounding fluid. Therefore, high heat dissipation performance can be obtained with certainty. Also in the case of (A2), as in (A1), when the first inner peripheral corner portion is assembled to the motor, the first inner peripheral corner portion of the rotor is more than the paired second inner peripheral corner portion. It may be located on the downstream side of the rotation or on the upstream side. The grounds, reasons, etc. are the same as in (A1).

  In the second inner peripheral corner portion that is paired with the first inner peripheral corner portion, the coil side surface of the second inner peripheral corner portion can be curved in a concave shape. With this configuration, the coil side surface of the second inner peripheral corner portion of the adjacent divided stator on the downstream side of the rotor functions as an introduction surface that introduces the lubricating / working oil into the groove without rebounding. For this reason, the flow amount per unit time of the lubricating / hydraulic oil is increased, and the heat dissipation performance can be further improved.

  The stator according to the present invention is characterized in that any one of the above-described divided stators is annularly arranged.

  With this configuration, the heat radiation effect obtained for each of the divided stators can be obtained in the state of the stator.

  According to the split stator and the stator of the present invention, it is possible to obtain a molded motor with further improved heat dissipation.

FIG. 1 is a perspective view showing a split stator 10 according to an embodiment of the present invention. In the split stator 10, the body is covered in the molding resin 3, the groove 5 is provided on the coil side surface S _s of the resin mold. Grooves 5 provided on the coil side surface S _s is the inner peripheral surface of the open end and (rotor opposing surface) S _i, having a coil end surface S _e, communicates with the inner peripheral surface side and the coil end side ing. Two corner portions where the inner peripheral surface S _i and the coil side surface S _s cross each other form a pair, a first inner peripheral side corner portion K ₁ , a second inner peripheral side corner portion K ₂ , Is formed.

  FIG. 2 is a view showing the main body (pre-mold divided stator) 20 before being resin-molded. The core wound around the winding 21 forming the coil is arranged with a flange 25 on the inner peripheral surface side and a back yoke 26 on the outer peripheral surface side. The core may be formed of a laminated steel plate, or may be a compacted body of particles having an insulating coating. Molding is performed by the molding resin 3 so as to cover the main body 20, and the divided stator 10 shown in FIG. 1 is formed. For the resin mold, a method commonly used for producing a molded motor can be used.

  A rotor (not shown) has a plurality of divided stators 10 that are positioned in alignment with an axis (axis) at the center of a stator that is annularly arranged along the circumferential direction of the stator shown in FIG. Rotate around. In many cases, the main rotation direction of the rotor is one direction, but the rotor may be rotated in the forward direction and the reverse direction). As the rotor rotates, the lubricating / working oil charged in the motor housing moves in the same direction while facing the drive force and centrifugal force of the rotor and moving outward.

Groove 5 above is formed so as to be lead to either the inner peripheral surface S _i of the two coil end surface S _e. These grooves 5 may move the lubricating / hydraulic oil from the inner peripheral surface side to the coil end surface _Se side, and conversely, from the coil end surface _Se side to the inner peripheral surface _Si side. Lubrication / hydraulic oil may be moved. In a force applied to the lubrication and hydraulic oil as described above, when the centrifugal force is dominant, the lubricating-hydraulic oil is to move from the inner circumferential surface S _i side coil end surface S _e side naturally. However, depending on the shape of the rotor, the shape of the casing surrounding the stator and the rotor, etc., the pressure of the lubrication / working oil on the inner peripheral surface _Si side is greater than the pressure of the lubrication / working oil on the coil end surface _Se side. The lubricating / hydraulic oil may move from the coil end surface _Se side to the inner peripheral surface _Si side. In either case, the lubricating-hydraulic oil, will be through the coil side surface S _s of the stator segment 10, heat removal by the lubricant-hydraulic oil from the coil side surface S _s is increased, heat dissipation is revolutionary To improve.

  FIG. 3 is a diagram showing an outline of a stator 50 formed by arranging the divided stator 10 shown in FIG. 1 in an annular shape. In FIG. 3, the stator 50 is configured by 18 divided stators 10. Therefore, the central angle per one divided stator is 20 degrees. In the stator 50 constituted by 18 divided stators 10, the grooves 5 are arranged on 18 surfaces.

  The groove 5 has a half-moon shaped cross section on the surface of the resin mold of one divided stator 10, but as shown in FIG. 4, the cross section is circular with the groove on the resin mold of the adjacent divided stator. It is preferable to reduce the flow resistance of the lubricating / hydraulic oil. The cross-section of the combined groove is not limited to a circular shape, but may be any square shape, but the point is that the groove of the adjacent split stator is united with each other to form a passage with a large cross-section. It is preferable in reducing the flow resistance of oil.

In FIG. 3, the stator 50 has fluid passages communicating with the inner peripheral surface _Si side and the coil end surface _Se side at 18 points with a central angle of 20 °, and heat dissipation from the entire stator. Will improve dramatically. As a result, the temperature rise of the stator is suppressed, and shortening of the life can be prevented.

The coil side surface S _s of the split stator 10 shown in FIG. 1 is formed from a flat surface, that is, a radial flat surface extending radially from the axis, and the inner peripheral corners K ₁ and K ₂ are cylindrical surfaces (inner peripheral surfaces). And a normal corner portion formed by intersecting the radiation flat surface thereof. However, considering that the lubrication / working oil moves due to the rotation of the rotor, the lubrication / working oil is further introduced into the groove 5 from the inner peripheral surface _Si side or the coil end surface _Se side. Thus, the inner peripheral corner portion may be shaped so as to promote circulation.

FIG. 5 is a top view showing a split stator including inner peripheral side corner portions K ₁ and K _{2 in} which lubricating / working oil is further circulated. 5, the first inner peripheral side corner portion K ₁ located on the rotor rotating the downstream side, in the transverse plane of the axis, has a receding shape than normal corners. The usual corner portion, as shown in FIG. 6 refers to a corner portion dashed neutral line (emitting flat surface) forms a circumferential (not retracted) and the inner peripheral surface S _i intersects. As shown in FIGS. 5 and 6, a first inner peripheral side corner portion K ₁ located downstream of the rotor rotation is recessed from the usual corner. For this reason, the following effect can be obtained.

(1) when the second inner peripheral side corner portion K ₂ forming the first inner peripheral side corner portion and pair of ordinary corner shape (see Figure 7):
(The first inner peripheral corner portion K ₁ of the divided stator / the second inner peripheral corner portion K ₂ of the adjacent divided stator) Only the amount of the first inner peripheral corner portion K ₁ receding from the boundary portion A space is formed. Lubrication / hydraulic oil is easily trapped in this space, and the coil side surface S _s of the adjacent split stator easily accepts the flowing lubrication / hydraulic oil and easily exhibits the effect of introducing it into the groove. . Therefore, the circulation of the lubricating / working oil is promoted, and the heat dissipation is further improved.

(2) As shown in FIGS. 5 and 6, the second inner peripheral corner portion K ₂ that makes a pair with the first inner peripheral corner portion extends the length of the inner peripheral surface and curves in a concave shape. Case (when the divided stator of FIG. 5 is arranged as shown in FIG. 3):
In this case, the space in (1) is slightly narrowed by the second inner peripheral side corner, but the coil side surface S _s of the adjacent split stator accepts the flowing lubricating / working oil so as to flow into the groove. It becomes easy to demonstrate the action to introduce more powerfully. Therefore, the circulation of the lubricating / working oil is promoted, and the heat dissipation is further improved.

The above matters, in cross-section of the axis, the first in the inner corner portion K ₁ and the second inner peripheral side corner portion K ₂ a pair, the second inner peripheral side corner portion of the stator segments K ₂ have shown that it may be in the form of as neutral to the length of the inner circumferential surface S _i (1). Further, it may be a shape, the extended so as to extend the length of the inner circumferential surface S _i as (2).

For the first inner peripheral side corner portion K ₁ is a corner portion receding from the normal of the corner portion are all described for the case located downstream of the direction of rotor rotation. However, as shown in FIG. 8, the inner peripheral side corner portion K ₁ first may be disposed upstream of the rotor rotation. In this case, lubrication and hydraulic fluid, moves the inner circumferential surface along S _i relatively large velocity, since it is difficult enter the said space, the pressure of the lubricating-hydraulic oil in the space, the space in the case of FIG. 7 Lower than the lubrication / hydraulic oil. That is, since the lubrication / working oil passes at high speed inside the space (rotor shaft core side), the lubrication / working oil in the space receives a force that is drawn into the high-speed flow. For this reason, although depending on the shape of the rotor and the inner surface shape of the motor housing, the pressure of the lubrication / working oil on the coil end surface _Se side becomes higher than the pressure on the inner peripheral surface _Si side, and the lubrication / working oil Circulates from the coil end surface side to the inner peripheral surface side. As a result,
Even when the inner peripheral side corner portion K ₁ first disposed upstream of the rotor rotation, it is possible to enhance the heat dissipation. Therefore, the first position of the inner peripheral surface side corner portion K ₁ of the above may be downstream of the upstream side of the direction of rotor rotation in the stator segment 10..

Also, since that there may be shaped arrangement of the inner peripheral side corner portion as shown in FIG. 8, as shown in FIG. 9, (3) the inner peripheral side corner portion K ₂ of the second is recessed from the neutral corner geometry You may have the shape. The inner peripheral side corner portion of the shape shown in FIG. 9 has the effect of the shape of the inner peripheral side corner portion of FIG. 7 (flow from the inner peripheral surface side to the coil end surface side) and the inner peripheral side corner portion of FIG. Any of the effects of the shape (flow from the coil end surface side to the inner peripheral surface side) can be provided. Either one of the functions and effects appears depending on the mechanical condition for the fluid, the position of a plurality of grooves, and the like.

  In the embodiment of the present invention, by providing a groove on the coil side surface of the divided stator that is a structural unit of the stator, it is possible to pass lubricating oil and hydraulic oil for each coil side surface of the divided stator. For this reason, compared with the conventional measures for providing a groove or the like for the stator of the annular integrated body to increase the heat dissipation, the stator of the integrated body is substantially cut into divided units to radiate heat for each divided unit. , The heat dissipation can be dramatically improved. For this reason, the temperature rise of a stator can be suppressed reliably and the lifetime shortening resulting from a temperature rise can be prevented.

  Although the embodiments and examples of the present invention have been described above, the embodiments and examples of the present invention disclosed above are merely examples, and the scope of the present invention is the implementation of these inventions. It is not limited to the form. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  According to the split stator and the stator of the present invention, since a stator having excellent heat dissipation can be formed, it is possible to expect an extension of the life of the stator or a motor using the stator.

It is a perspective view which shows the division | segmentation stator in embodiment of this invention. It is a perspective view which shows the pre-molding division | segmentation stator before resin-molding the division | segmentation stator of FIG. It is a figure which shows the stator which makes the division | segmentation stator of FIG. 1 a structural unit. It is a figure which shows the state united with the groove | channel of the adjacent division | segmentation stator. It is a figure explaining the shape of the division | segmentation stator for accelerating | stimulating the circulation of lubricating oil. It is a figure for demonstrating the shape of a division | segmentation stator. It is a figure explaining the modification of the shape of the division | segmentation stator for accelerating | stimulating the circulation of lubricating oil. It is a figure explaining the modification of the shape of another division | segmentation stator for promoting the circulation of lubricating oil. It is a figure explaining the modification of the shape of another division stator for accelerating circulation of lubricating oil.

Explanation of symbols

3 Mold resin, 5 grooves, 10 split stator (after resin molding), 20 body (pre-mold split stator), 21 windings, 25 mm, 26 back yoke, _Si inner peripheral surface (rotor facing surface), _Se coil End surface, S _s coil side surface, _So outer peripheral surface, K ₁ first inner peripheral side corner portion, K ₂ second inner peripheral side corner portion.

Claims (8)

A split stator that is a constituent element of the stator located on the outer peripheral side of the rotor,
A body wound with a winding around a core;
A resin mold for covering the main body,
A split stator, wherein the resin mold is provided with a groove.   The split stator according to claim 1, wherein the groove is provided on a coil side surface of the split stator.   The split stator according to claim 2, wherein the groove has an open end on an inner peripheral surface that is a surface facing the rotor.   The split stator according to claim 3, wherein the groove has an open end on a coil end surface and communicates with the inner peripheral surface and the coil end surface.   In the axial cross section of the stator, in the first inner peripheral corner where one of the two coil side surfaces of the split stator intersects the inner peripheral surface, the first inner peripheral corner is 5. The split stator according to claim 3, wherein the stator has a shape that shortens the inner peripheral surface. 6.   In the axial cross section of the stator, at the first inner peripheral corner where one of the two coil side surfaces of the divided stator intersects the inner peripheral surface, the coil side of the first inner peripheral corner 5. The split stator according to claim 3, wherein the surface is bent so as to shorten the inner peripheral surface and intersects the inner peripheral surface. 6.   The coil side surface of the second inner peripheral side corner portion that is paired with the first inner surface side corner portion is curved in a concave shape. The split stator according to 5 or 6.   The stator according to any one of claims 1 to 7, wherein the split stator is annularly arranged so as to surround the rotor.

Images