JP6215034B2 - Electric motor and electric motor bobbin - Google Patents

Description

  The present invention relates to an electric motor provided with a coil and an electric motor bobbin, and more particularly to an electric motor and an electric motor bobbin configured to insert a bobbin wound with a coil into a stator tooth.

For example, in a surface magnet type permanent magnet motor in which a permanent magnet is arranged on the rotor surface, it is common to arrange a concentrated winding coil on the stator core. In this case, the insulation between the stator core and the coil is ensured. In order to facilitate winding around the coil, a bobbin made of resin or the like is often used. The bobbin has a length substantially equal to the length of the teeth of the stacota to wind the coil, and has a screen-like wall surface at both ends of the tooth tip side and the core back side, and the coil is wound between the wall surfaces. It is supposed to be turned.
In this case, fixing of the coil, that is, fixing of the bobbin significantly affects the reliability of the concentrated winding stator.

  Patent Document 1 discloses an electric motor in which a bobbin is divided so as to be disposed only on the upper and lower surfaces of a stator core and a coil is wound in that state. The bobbin inner wall is provided with a protrusion at a position opposite to the tea scoreback portion, and the magnetic steel sheet of the stator core having a hole at a position corresponding to the protrusion is overlapped with a thickness substantially equal to the thickness corresponding to the protrusion height. Thus, the protrusion of the bobbin and the hole of the stator core are fitted and fixed. Further, the bobbin protrusion is provided so as to coincide with the outside of the brim portion on both sides of the teeth tip of the stator core. Thus, the structure which a bobbin is fixed with respect to a stator core by 3 points | pieces of a core back part and the collar part of the both sides of the teeth front-end | tip is disclosed.

JP 2012-095492 A

In the configuration of Patent Document 1, the accuracy of fixing the bobbin depends on the dimensional accuracy of each protrusion, hole, and tooth tip. On the other hand, the accuracy of the stator core for laminating bobbins and electromagnetic steel sheets molded with resin is limited, so it is extremely difficult to fit without rattling, and there is a problem that a lot of man-hours and devices are required for molding and assembly is there.
There is a demand for a technique that can easily fix the bobbin and the tater core without being greatly affected by the accuracy of the dimensions of the bobbin and the stator core and also in assembling them.

  In order to solve the above problems, for example, the invention described in the claims is applied. That is, an electric motor having a bobbin in which a coil is wound around an outer periphery and a stator core that inserts the bobbin into a tooth portion, and the bobbin has a substantially cylindrical inner wall surface shape roughly corresponding to the outer peripheral shape of the tooth portion. The height of the top of the vertical section and the width of the base portion continuously increase in the vicinity of the end of the stator core teeth in the direction of insertion of the teeth on the inner wall in the vicinity of the end of the teeth. And at least one protrusion.

According to one aspect of the present invention, it is possible to flexibly cope with a change in the thickness of the stator core and to securely fix the bobbin and the teeth.
Other problems and effects of the present invention will become apparent from the following description.

It is a schematic diagram which shows the radial cross section structure of the concentrated winding permanent magnet motor which is one Embodiment to which this invention is applied. It is a schematic diagram which shows the axial direction cross-section of the concentrated winding permanent magnet motor of this embodiment. It is a schematic diagram which shows the structure of the bobbin applied to the concentrated winding permanent magnet motor of this embodiment. In the same figure, when the surface which is a teeth insertion direction is made into the front, Fig.3 (a) is a left view, FIG.3 (b) is a back view, FIG.3 (c) is a front view, FIG. 3D is a top view, and FIG. 3E is a right side view. FIGS. 4A and 4B are transition diagrams schematically showing the state before and after the bobbin is inserted into the teeth in the concentrated winding permanent magnet motor of the present embodiment. FIG. 5A is an enlarged schematic view of the main part of the protrusion of this embodiment, and FIGS. 5B and 5C are schematic views showing other examples of the protrusion.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 shows a radial sectional structure of a concentrated winding permanent magnet motor which is an embodiment to which the present invention is applied.

  A rotor core 11 having a groove is provided in the inner diameter direction of the rotor 1, and permanent magnets 12 are arranged in the groove. A coil 22 is provided at a tooth portion of the stator core 21 in the outer diameter direction of the stator 2. In this embodiment, the outer rotor and the stator have an open slot structure, the concentrated winding and the permanent magnet are also rectangular, the number of poles is 40, the number of slots is 48, and the ratio of the number of poles to the number of slots is 10:12.

FIG. 2 shows an axial sectional structure of the concentrated winding permanent magnet motor. A stator core is installed on the frame 23 of the stator 2, and the rotor 1 is rotatably connected to the stator frame 23 via a bearing 13.
FIG. 3 shows a schematic structure of the bobbin inserted into the teeth of the stator 2. In FIG. 3A, the teeth are inserted from the right direction. 3A is an external view from the side of the bobbin, FIG. 3B is a B view as viewed from the B side in FIG. 3A, and FIG. 3C is a view from the C side in FIG. FIG. 4 (d) is a D view as viewed from D in FIG. 4 (a), and FIG. 3 (e) is an E sectional view in FIG. 3 (c).

As shown in FIG. 3A, the bobbin 30 is formed as a substantially rectangular tube having an end plate 301 at the tip of the bobbin and an end plate 302 at the base of the bobbin on both sides. An upper plate 303 and a lower plate 304 of the cylinder are arranged, and a substantially cylindrical coil guide projection 307 is provided at the base portion of the bobbin. Further, a plurality of (in this example, two) projections 309 having a substantially triangular pyramid shape are provided on the inner surface side of the lower plate 304 (see FIGS. 3B and 3C). As shown in FIG. 3D, the bobbin 30 is provided with bobbin side plates 305 and 306 on the left and right.
As shown in FIG. 3, the end plates 301 and 302 are provided with holes, and this is a portion into which a tooth portion 212 (FIG. 4) of a stator core described later is inserted and arranged.

  The two projections 309 having a substantially triangular pyramid shape are arranged in parallel in the rotation direction with apexes (such as 320z in FIG. 5A) directed in the rotation axis direction. At least one side of the protrusion 309 is longer than the other two sides, and the long side faces the end plate 302 and is disposed in a portion near the end plate 301 on the lower plate 304. In the present embodiment, a part of the hypotenuse of the protrusion 309 extends in the direction opposite to the insertion direction of the teeth 212. However, as the tooth 212 is inserted, the top of the extension hypotenuse of the protrusion 309 gradually increases. This is because the contact area with the teeth 212 is gradually enlarged and the friction coefficient is increased, thereby facilitating the fitting. That is, the protrusion 309 is not limited to a triangular pyramid shape as long as the height of the vertical cross section and the width of the base portion are continuously increased as it proceeds in the insertion direction. Details will be described later.

FIG. 4 shows a schematic configuration of the bobbin 30 around which the coil is wound and the stator core 21 (tooth). FIG. 4A shows a side cross section before the bobbin 30 is inserted into the stator core 21, and FIG. 4B shows a side cross section after the bobbin 30 is inserted into the stator core 21 and integrated.
As shown in FIG. 4A, the coil 22 is wound between the end plates 301 and 302 of the bobbin 30. A lead wire portion (not shown) extending from the coil 22 is connected to another coil, a neutral point connection, a motor lead wire, or the like via a coil guide 307.

  The stator core 21 includes a substantially rectangular parallelepiped tooth portion 212 having an open slot shape, and a substantially fan-shaped core back portion 211 that joins the teeth, and a plurality of electromagnetic steel plates that are die-cut and formed as a unit are stacked. Configured. The stacking direction is the vertical direction (rotation axis direction) in the figure. For example, if there is a height of 50 mm in the stacking direction, about 100 0.5 mm thick laminated plates are stacked in the vertical direction in the figure. Yes.

Further, as shown in FIG. 4A, when the height of the protrusion 309 is H, the distance between the upper plate 303 and the lower plate 304 of the bobbin is G, and the stack thickness of the stator core is L, the following relationship is established. Is set.
GH <L (1)
Further, the thickness of the stator core 21 varies due to the thickness deviation of the electromagnetic steel sheet used in the stator core. At this time, if the maximum product thickness and Lmax and the minimum product thickness are Lmin,
GH <Lmin (2)
G> Lmax (3)
Each dimension is set so that With this configuration, the stator core can be inserted into the bobbin even with the maximum dimension, and can be fixed by the action of the protrusion 309 even when the stator core is the minimum dimension.

  As shown in FIG. 4 (b), when the bobbin 30 is inserted into the stator core 21, the protrusion 309 is cut (or crushed) by the teeth 212 of the stator core. The contact surface of the protrusion 309 allows the bobbin 30 and the stator core 21 to be fixed by a frictional force acting between the bobbin 30 and the tooth portion 212.

  With reference to FIG. 5 (a)-(c), the shape of the projection part 309 and another example of a shape are demonstrated. FIG. 5A is an enlarged view of a main part of the protrusion 309 shown in FIGS. 3 and 4. In the drawing, the lower left part is a side view observed from the side surface in the insertion direction of the teeth 212, and the upper part is a schematic view when observed from the upper surface. The shape of the x, y, z cross section is shown on the right. Each of the cross-sections x, y, and z has a top portion 320x-z and 330x-z indicating a base portion. The top portion 320z is the highest vertex of the top portion of the protrusion 309.

  FIGS. 5B and 5C are other examples of the protrusion 309, and when viewed from the side, the top of the head is not a straight line but has a curved positional relationship that gradually increases (or decreases). In addition, the vertical section of the protrusion 309 is not necessarily a triangle, and as shown in (b) and (c), the lengths of two sides other than the base may be different or curved. .

  Furthermore, the shape of the protrusion 309 may be a polygon other than a triangle in the vertical direction, an elliptical system, or a circle, and the number of tops continuous in the insertion direction of the teeth 212 is not limited to one. The top line is not necessarily parallel to the insertion direction of the teeth 212, and may be inclined within a range in which an effect of increasing the contact surface by cutting (or crushing) can be obtained according to the insertion.

  As described above, according to the present embodiment, it is possible to obtain an effect that the stator core 21 and the bobbin 30 can be easily and reliably fixed.

  In particular, in this embodiment, since the bobbin 30 is formed of resin and is softer than the iron stator core 21, there is a specific effect that cutting of the protrusions 309 is relatively easy.

  In the present embodiment, since the long side of the triangular pyramid of the protrusion 309 extends in the root direction of the stator core 21 in the bobbin 30, the protrusion is gradually cut when inserted into the stator core, and smoothly There is also an effect that it can be inserted.

  Further, in the present embodiment, the bobbin 30 has a configuration in which the protrusion 309 is provided close to a portion (close to the end plate 301) located on the front end side of the stator core 21. There is also a peculiar effect that the cutting movable range of the protrusion 309 and the stator core 21 is reduced, and the time during which the insertion force of the stator core 21 is increased by cutting the protrusion 309 is shortened.

  Furthermore, in this embodiment, since the protrusion 309 is provided on the lower plate 304 of the bobbin 30, the height relationship between the upper surface of the stator core 21 and the bobbin is constant regardless of the thickness of the stator core 21. The arrangement of the lead wire from the coil of the bobbin 30 to the connection portion provided on the inner surface of the stator core can be kept substantially horizontal, improving wiring workability and wiring reliability, and reducing disturbance of magnetic flux on the outer surface. Can also be expected.

Although one embodiment for carrying out the present invention has been described above, the present invention is not limited to a concentrated winding permanent magnet motor, and various configurations can be applied without departing from the spirit of the present invention. For example, even in the motor to establish field by winding without using a permanent magnet, it is possible to obtain the same effect as a similar structure as long as the use of bobbins with concentrated winding.

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 stator, 11 ... Rotor core, 12 ... Permanent magnet, 21 ... Stator core, 22 ... Coil, 30 ... Bobbin, 309 ... Protrusion

Claims (8)

A stator having a stator core laminated with steel plates, and a bobbin wound around the outer periphery of the stator core and inserted into the teeth of the stator core;
A motor Ru and a rotor positioned in the circumferential direction outside the stator,
The bobbin
A substantially cylindrical inner wall surface in response outlined in outer peripheral shape of the tee scan,
At least the teeth inserted extending in a direction, in the vicinity of the stator core teeth insertion direction end portion of the inner wall surface, the width of the top portion height and the base of the vertical section increases continuously in response to approach the front Stories end One protrusion,
There is a guide projection for extending the outside in the axial direction to the outer surface on the back surface of the inner wall opposite to the inner wall surface on which the projection is provided, and for connecting the coil to other coils. And
The electric motor in which the protrusion is provided on the teeth tip side of the inner wall surface facing the stator core in the stacking direction . 2. The electric motor according to claim 1 , wherein a length of a radial top of the protrusion and a length of the opposed inner wall surface are shorter than a minimum product thickness value of the stator core, and the protrusion is provided. An electric motor in which a length between the inner wall surface and the opposed inner wall surface is longer than a maximum thickness value of the stator core. 3. The electric motor according to claim 1, wherein a vertical cross-sectional top portion of the projecting portion has a substantially square shape. The electric motor according to any one of claims 1 to 3 , wherein the bobbin is formed of a resin. Coil is wound around the outer circumference, a body portion having a substantially cylindrical inner wall surface corresponding to the teeth outer peripheral shape of the stator core formed by laminating steel plates,
Extending in the teeth insertion direction, near the end of the stator core teeth insertion direction of the inner wall surface of the main body, the height of the top of the vertical section and the width of the base increase as the end approaches. At least one protrusion with which at least a portion of the top of the head comes into contact with the teeth;
There is a guide projection for extending the outside in the axial direction to the outer surface on the back surface of the inner wall opposite to the inner wall surface on which the projection is provided, and for connecting the coil to other coils. And
The bobbin for an electric motor , wherein the protrusion is provided on the tooth tip side of the inner wall surface facing the stator core in the stacking direction . The bobbin for an electric motor according to claim 5 , wherein the length of the top of the protrusion in the radial direction of the main body and the opposing inner wall surface is shorter than the minimum thickness value of the stator core,
A bobbin for an electric motor in which a length between the inner wall surface on which the protrusion is provided and the opposed inner wall surface is longer than a maximum product thickness value of the stator core. The bobbin for an electric motor according to claim 5 or 6 , wherein a vertical cross-sectional top portion of the protrusion has a substantially square shape. The electric motor bobbin according to any one of claims 5 to 7 , wherein the bobbin is formed of a resin.

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