JPH09322453A - Stator core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and the size of a stator core. SOLUTION: A plurality of ring-shaped thin metal sheets 4 whose inner periphery has a plurality of magnetic pole piece 3 wound around magnetic field coil 2 at every equal angle and protruded towards center are layered then an insulating film is formed on the surface of these layered thin metal sheets 4. Crossovers 2b for connecting the winding parts 2a of the magnetic field coil 2 wound on the respective magnetic pole pieces 3 respectively are retained against cur pieces 6 extending to the outside of one end of the layering direction X from the spaces between the respective magnetic pole pieces 3 of the metal sheets 4 to this side of one end of the layering direction X among a plurality of metal sheets 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core incorporated in an inner type spindle motor or the like in which a rotor is rotationally driven inside a stator.

[0002]

2. Description of the Related Art As shown in FIG. 10, a stator core 8 of a conventional example is formed by laminating a plurality of ring-shaped metal thin plates 4 each having a magnetic pole piece 3 around which a field coil is wound and which protrudes at an equal angle on an inner peripheral portion. Then
The surface of these laminated metal thin plates 4 is covered with an insulating film 5,
Further, as shown in FIG. 11 or FIG. 12, from the position corresponding to each of the magnetic pole pieces 3 to the metal thin plates 4 located at one or both ends in the stacking direction indicated by the arrow x among the plurality of metal thin plates 4. A synthetic resin ring 9 having a claw 9a protruding outward from the end in the stacking direction is attached, and the claw 9 of the synthetic resin ring 9 is attached.
As shown in FIG. 10, a crossover 2b for connecting the winding portions 2a of the field coil 2 wound around each magnetic pole piece 3 is hooked on a.

[0003]

However, since the stator core 8 of the conventional example has a structure in which a synthetic resin ring 9 is additionally attached to a plurality of laminated metal thin plates 4 which is a main part thereof, the number of parts is reduced. However, there is a problem that miniaturization is hindered.

An object of the present invention is to solve the above problems, and it is an object of the present invention to reduce the number of parts of the stator core and achieve miniaturization.

[0005]

According to a first aspect of the present invention, there is provided a stator core in which a plurality of magnetic pole pieces for winding a field coil are laminated on an inner peripheral portion of a plurality of annular metal thin plates which are projected at equal angles. In the stator core in which the surface of the metal thin plate is covered with an insulating film, by cutting and raising between the magnetic pole pieces of the metal thin plates near the ends in the stacking direction among the plurality of metal thin plates,
Forming a cut-and-raised piece extending outward of the end in the stacking direction, and hooking a crossover wire connecting the field coils respectively wound on the magnetic pole pieces on the cut-and-raised piece. It was done.

In the stator core according to a second aspect of the present invention, the tip end of the cut and raised piece is bent outward in the radial direction of the thin metal plate.

In the stator core according to a third aspect of the present invention, both sides near the tip of the cut and raised piece are extended outward in the circumferential direction or the radial direction of the thin metal plate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 (a) and 1 (b), a stator core 1 according to an embodiment of the present invention is a magnetic pole having a substantially T-shape in plan view for winding a field coil 2. A plurality of ring-shaped metal thin plates 4 each having a diameter of about 25 mm, each of which protrudes 12 pieces 30 at an inner peripheral portion every 30 degrees, are laminated, and an insulating film 5 is formed on the surface of the laminated metal thin plates 4. Of the plurality of metal thin plates 4, the magnetic poles are attached to the cut-and-raised pieces 6 extending outward from one end in the laminating direction from between the magnetic pole pieces 3 of the metal thin plates 4 near one end in the laminating direction indicated by the arrow x. A crossover 2b that connects the winding portions 2a of the field coil 2 wound around each piece 3 is hooked.

In the field coil 2, a wire rod in which a thin core made of a conductor such as copper is coated with an electric insulating varnish is wound around one of the magnetic pole pieces 3 protruding from the thin metal plate 4. Then, all the magnetic pole pieces 3 are wound in the order of being wound and then wound on the other magnetic pole piece 3 which is located 90 degrees to 180 degrees away from the one magnetic pole piece 3 in the circumferential direction. It is a thing. The crossover wire 2b is a part of the field coil 2 and serves to connect the winding portions 2a to each other.

The metal thin plate 4 is not limited as long as it is a magnetic material capable of forming a magnetic circuit, but a silicon steel plate which is easy to plastically work and has a relatively small iron loss is punched into a desired shape by a press die. And the like.
The insulating film 5 is made of a metal thin plate made of an insulating material so that the insulating film 5 has a film thickness that can prevent energization between the field coil 2 and the metal thin plate 4 even when a voltage of about 24 mV is applied to the field coil 2. Four
Is applied to the entire surface of the.

The cut-and-raised piece 6 is formed on the first metal thin plate 4 counting from one end in the stacking direction among the plurality of metal thin plates 4 by the following procedure. That is, as shown in FIG.
As the first thin metal plate 4, a plate in which a cut-and-raised piece 6 having a rectangular shape in plan view is projected from the center between adjacent magnetic pole pieces 3 to the inner side in the radial direction is prepared. And each cut-and-raised piece 6 of the metal thin plate 4 concerned
A pair of notches 7 having a length corresponding to the thickness dimension of the thin metal plate 4 is cut in the vicinity of the base 6a of the sheet metal, and the base 6a of the cut-and-raised piece 6 is once outside with a crease between the inner ends of the pair of notches 7. The bent and bent piece 6 is bent to approximately 90 degrees, and the inner and outer edges of the thin metal plate 4 and the inner surface of the cut and raised piece 6 are flush with each other, as shown in FIG.
Make the whole stand up.

Further, as shown in FIGS. 3 and 4, the cut-and-raised piece 6 has its tip 6b extending outward in the radial direction of the thin metal plate 4 in order to improve the catching on the connecting wire 2b. The angle between the base 6a and the tip 6b of the cut-and-raised piece 6 may be bent at an inclination angle of 90 degrees or less or 90 degrees. In particular, when the cut-and-raised pieces 6 are bent at an inclination angle of 90 degrees or less as shown in FIG. 3, the crossover wire 2b is wound to some extent in the process of sequentially winding the field coil 2 around each magnetic pole piece 3. Since the crossover wire 2b slides toward the root 6a only by applying tension, the labor of positioning the crossover wire 2b for each cut-and-raised piece 6 can be omitted.

Further, as the cut-and-raised piece 6, as shown in FIG. 5, one having a substantially T-shape in a plan view in which both sides 6c near the tip 6b are projected in the circumferential direction of the thin metal plate 4 may be applied. In this case, the crossovers 2b that are slightly curved along the thin metal plate 4 while being hooked on the cut-and-raised pieces 6 are further attached to both sides 6c of the cut-and-raised pieces 6.
It can be hooked at two places.

Further, as shown in FIGS. 6 and 7, both sides 6c of the cut-and-raised piece 6 are extended by 90 degrees toward each other so as to extend to the outside in the radial direction of the thin metal plate 4. It may be bent at a predetermined inclination angle less than that. Especially,
As shown in FIG. 8, when the inclination angle a of both sides 6c of the cut and raised piece 6 is set to 30 degrees or more, the both sides 6c near the tip 6b of the cut and raised piece 6 are relatively large with respect to the crossover 2b. Since they can be crossed at an angle, there is an advantage that the crossover 2b can be stably hooked.

Both sides 6d near the base 6a of the cut and raised piece 6
Is a taper surface whose diameter is reduced toward the root 6a, as described above, in the process of sequentially winding the field coil 2 around each magnetic pole piece 3, it is necessary to accurately position the crossover wire 2b for each cut-and-raised piece 6. Can be omitted.

The cut-and-raised pieces 6 may be formed on the second and subsequent metal thin plates 4 counting from one end in the stacking direction among the plurality of metal thin plates 4, but in this case, The cut-and-raised piece 6 is bent outward by approximately 90 degrees with a crease between the inner peripheral edge and the entry corner of the cut-and-raised piece 6.

As described above, the advantage of forming the cut-and-raised pieces 6 on the second and subsequent thin metal plates 4 is to change the specifications of the stator core 1 without changing the dimensional shape of the cut-and-raised pieces 6. It is possible to easily increase or decrease the size of the raised piece 6 projecting outward from one end in the stacking direction from the first thin metal plate 4. For example, when the cut and raised piece 6 is formed on the third metal thin plate 4, the cut and raised piece 6 is formed on the first metal thin plate 4 more than when the cut and raised piece 6 is formed on the first metal thin plate 4. It is possible to reduce the size of the one end protruding outward by the thickness of the two metal thin plates 4.

If twelve magnetic pole pieces 3 are projected at equal intervals on the inner peripheral portion of the metal thin plate 4 having a diameter of about 25 mm, the distance between the adjacent magnetic pole pieces 3 becomes about 4 mm, so that the adjacent magnetic pole pieces 3 are adjacent to each other. Although one cut-and-raised piece 6 is formed between the matching magnetic pole pieces 3, the size and shape of the metal thin plate 4 is not limited, and if the metal thin plate 4 has a large diameter, it is adjacent to each other. Two or more cut-and-raised pieces 6 may be formed between the matching magnetic pole pieces 3. Furthermore, in the above description, the cut-and-raised pieces 6 are formed only on the metal thin plate 4 near one end in the stacking direction among the plurality of metal thin plates 4, but in addition to the metal thin plate 4 near one end, the other end is formed. The cut-and-raised pieces 6 may be formed on the first or second metal thin plate 4 on the near side.

[0019]

According to the stator core of claim 1,
Since the cut-and-raised piece is formed on the metal thin plate near one end in the stacking direction among the plurality of metal thin plates, the crossover wire can be hooked on the cut-and-raised piece without attaching a synthetic resin ring as in the conventional example. You can Therefore, it is possible to reduce the number of parts constituting the stator core and to achieve miniaturization of the entire stator core.

According to the stator core of the second aspect, since the tip of the cut-and-raised piece is bent outward in the radial direction of the thin metal plate, the connecting wire is separated from the cut-and-raised piece to the outside of the end in the stacking direction. It can be surely prevented.

According to the stator core of the third aspect, both sides near the tip of the cut-and-raised piece are extended to the outer side in the circumferential direction or the radial direction of the thin metal plate, so that the metal is retained by the cut-and-raised piece. Crossovers that curve along the thin plate can be hooked at two locations on both sides of the cut-and-raised pieces, which can reliably prevent the cut-and-raised pieces from coming out outward, and the hooks can be stably hooked. can do.

[Brief description of drawings]

1A is a plan view of a stator core according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along the line AB.

FIG. 2 is a plan view of a main part of a thin metal plate.

FIG. 3 is a perspective view of a main part of the stator core according to the embodiment of the present invention.

FIG. 4 is a perspective view of an essential part of a first modification of the stator core according to the embodiment of the present invention.

FIG. 5 is a perspective view of an essential part of a second modification of the stator core according to the embodiment of the present invention.

FIG. 6 is a perspective view of an essential part of a third modification of the stator core according to the embodiment of the present invention.

FIG. 7 is a plan view of a fourth modification of the stator core according to the embodiment of the present invention.

FIG. 8 is a plan view of an essential part of a fourth modification of the stator core according to the embodiment of the present invention.

FIG. 9 is a sectional view of an essential part of a fourth modification of the stator core according to the embodiment of the present invention.

FIG. 10 is a plan view of a stator core according to a conventional example.

11 is a sectional view taken along the line A′-B ′ of FIG.

FIG. 12 is a sectional view of a modification of the conventional stator core.

[Explanation of symbols]

 1 Stator core 2b Crossover 2 Field coil 3 Magnetic pole piece 4 Metal thin plate 5 Insulating film 6 Cut and raised piece

Claims (3)

[Claims] 1. A stator core in which a plurality of ring-shaped metal thin plates, each of which has a plurality of magnetic pole pieces wound around a field coil and protrudes at an equal angle, are laminated on an inner peripheral portion, and the surfaces of these metal thin plates are covered with an insulating film. A cut-and-raised piece extending outward from the end in the stacking direction is formed by cutting and raising between the magnetic pole pieces of the metal thin plates near the end in the stacking direction among the plurality of metal thin plates. The stator core is characterized in that a crossover wire connecting the field coils wound around the magnetic pole pieces is hooked on the cut-and-raised piece. 2. The stator core according to claim 1, wherein a tip of the cut-and-raised piece is bent outward in the radial direction of the thin metal plate. 3. The stator core according to claim 1, wherein both sides near the tip of the cut and raised piece extend outward in the circumferential direction or the radial direction of the thin metal plate.