JP6853149B2 - Stator structure and resolver - Google Patents

Description

The present invention relates to a stator structure and a resolver.

Conventionally, resolvers that detect the rotation angle of rotating electric machines such as motors and generators have been known. Such a resolver includes, for example, a stator core having a plurality of teeth extending from the inner peripheral side of the main body formed in an annular shape toward the center, and a rotor arranged inside the stator core so as to face the plurality of teeth. Be prepared. Further, a winding is wound around the tooth via an insulator, and the winding is entwined with one end of a terminal. Then, the other end of the terminal is arranged so as to extend to the lead wire holding portion, and the lead wire holding portion is connected to the lead wire wired from the external device (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-107869

However, in the conventional technique, since the lead wire holding portion is provided so as to project outward from the outer peripheral side of the stator core, the outer diameter of the resolver becomes large, and there is a possibility that dimensional restrictions may occur when the resolver is attached to the rotary electric machine. there were.

The present invention has been made in view of the above, and an object of the present invention is to provide a stator structure and a resolver capable of improving the mountability to a rotary electric machine.

In order to solve the above-mentioned problems and achieve the object, the stator structure according to one aspect of the present invention includes a stator core, an insulator, a coil, a lead wire holding portion, and a terminal. The stator core has an annular main body and a plurality of teeth extending radially from the main body. The insulator covers the plurality of teeth from both sides in the axial direction of the stator core. The coil is wound around each of the plurality of teeth via the insulator. The lead wire holding portion is held so that the lead wire is directed in the axial direction. The terminal extends in one side in the axial direction and extends in one side in the radial direction and is housed in the lead wire holding portion. It has a connecting portion to which the lead wire is connected, and the entwined portion is arranged inside the circumscribed circle of the stator core. The entwined portion of the terminal extends in the same direction as the lead wire heads. The lead wire holding portion is formed with a notch portion in which one side in the axial direction and one side in the radial direction are cut out in a substantially L-shaped cross section. In the lead wire, a core wire connected to the connection portion extends radially inside the notch portion, is bent inside the notch portion, and is located on the other side in the axial direction inside the notch portion. It is postponed. The core wire is exposed on one side in the axial direction.

According to one aspect of the present invention, the mountability to a rotary electric machine can be improved.

FIG. 1 is a perspective view showing a configuration of a stator structure according to an embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a bottom view showing the configuration of the stator structure according to the embodiment. FIG. 4 is a top view showing the configuration of the resolver according to the embodiment. FIG. 5 is a perspective view showing a state when the lead wire is attached to the lead wire holding portion.

Hereinafter, the stator structure and the resolver according to the embodiment will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the use of the stator structure and the resolver. In addition, it should be noted that the drawings are schematic, and the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the reality. Further, even between the drawings, there may be parts having different dimensional relationships and ratios from each other.

(Structure of stator structure)
First, the details of the stator structure 1 according to the embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the configuration of the stator structure 1 according to the embodiment, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 shows the configuration of the stator structure 1 according to the embodiment. It is a bottom view which shows.

As shown in FIG. 1, the stator structure 1 includes a stator core 10, an insulator 20, a coil 30, a lead wire holding portion 40, and a terminal 50 (see FIG. 2). A lead wire 100 extending from an external device (not shown) is attached to the stator structure 1 shown in FIG.

The stator core 10 has a laminated structure in which a plurality of steel plates such as electromagnetic steel plates are laminated. The stator core 10 has a main body 11 and a plurality of teeth 12. The main body 11 is annular, and in the embodiment, it is annular. The plurality of teeth 12 extend from the inner peripheral side of the main body portion 11 toward the center of the main body portion 11 (that is, in the radial direction).

In the following, as shown in FIG. 1, the radial direction, the axial direction, and the circumferential direction of the stator core 10 will be defined and described. Here, the "radial direction" is a direction orthogonal to the rotation axis of the rotor 2 (see FIG. 4) rotating inside the stator core 10, and the "axial direction" is the axial direction of the rotation axis of the rotor 2. It is a direction that coincides, and the "circumferential direction" is a direction that coincides with the rotation direction of the rotor 2.

Further, in the main body 11, a plurality of recesses 11a, a plurality of through holes 11b, and a plurality of through holes 11c are formed at equal intervals in the circumferential direction. The recess 11a is a portion recessed from the outer peripheral portion of the main body portion 11 to the inner peripheral side.

The through hole 11b is formed in a portion of the main body 11 where the recess 11a is not provided, penetrates in the axial direction, and has a shape elongated in the circumferential direction. The through hole 11b functions as a screw fixing hole into which a bolt or the like is inserted when the stator structure 1 is attached to a rotating device or the like.

The through hole 11c is formed adjacent to the recess 11a of the main body portion 11, has a shape that penetrates in the axial direction and extends long in the circumferential direction. The function of the through hole 11c will be described later.

The insulator 20 is an insulating member, and is formed by, for example, injection molding of an insulating resin. The insulator 20 is formed by, for example, insert molding so that the stator core 10 is embedded therein, and covers the stator core 10 from both sides in the axial direction.

The coil 30 is wound around each of the plurality of teeth 12 via the insulator 20. The coil 30 is composed of an exciting winding and an output winding. Further, the output winding of the coil 30 is composed of a sin phase output winding that outputs a sin phase output signal and a cos phase output winding that outputs a cos phase output signal.

The lead wire holding portion 40 is formed integrally with the insulator 20, is supported by the main body portion 11 of the stator core 10, and is arranged so as to enter the recess 11a. The lead wire holding portion 40 has a plurality of cutout portions 40a (6 in the embodiment) in which one side in the axial direction (upper side in the drawing) and one side in the radial direction (outer peripheral side in the drawing) are cut out in a substantially L-shaped cross section. The lead wire 100 extending from the external device is inserted into and held in the notch 40a.

The terminals 50 shown in FIG. 2 are conductive members such as metal, and a plurality of terminals 50 (six in the embodiment) are provided. The terminal 50 is held so as to be embedded in the lead wire holding portion 40. That is, the lead wire holding portion 40 also functions as a terminal block for holding the terminal 50.

The terminal 50 has a entwined portion 50a and a connecting portion 50b. The entangled portion 50a is provided at the end portion on the inner peripheral side of the terminal 50, extends to one side in the axial direction (lower side in the drawing), and stands upright so as to project from the lead wire holding portion 40. The end of the winding forming the corresponding coil 30 is entwined with the entwined portion 50a. Then, for example, by performing TIG (Tungsten Inert Gas) welding on the entwined portion 50a in which the ends of the windings are entwined, the winding and the entwined portion 50a can be electrically connected.

For example, the winding end of the exciting winding, the winding end of the exciting winding, the winding start of the sin phase output winding, and the winding end of the sin phase output winding are formed on the entwined portion 50a of the six terminals 50. , The winding start of the cos phase output winding and the winding end of the cos phase output winding are entwined, respectively.

The connecting portion 50b is provided at the outer peripheral end of the terminal 50 and extends in the radial direction. Further, the connecting portion 50b has a flat plate shape, and the upper surface is exposed inside the notch portion 40a. A core wire 100a exposed from the tip of the lead wire 100 held by the lead wire holding portion 40 is connected to the connecting portion 50b. For example, the lead wire 100 and the terminal 50 can be electrically connected by performing resistance welding on the connecting portion 50b of the core wire 100a.

Here, in the embodiment, as shown in FIG. 1, the lead wire holding portion 40 is arranged so as to enter the recess 11a formed in the stator core 10, and as shown in FIG. 3, the entwined portion of the terminal 50. 50a is arranged inside the circumscribed circle C of the stator core 10. As a result, it is possible to prevent the lead wire holding portion 40 and the terminal 50 from protruding outward from the main body portion 11 of the stator core 10 in the radial direction.

Further, in the embodiment, as shown in FIGS. 1 and 2, a plurality of lead wires 100 are held in the lead wire holding portion 40 so as to be oriented in the axial direction. As a result, it is possible to prevent the plurality of lead wires 100 from protruding outward from the main body 11 of the stator core 10 in the radial direction.

That is, in the embodiment, since it is possible to prevent each component of the stator structure 1 and the lead wire 100 from protruding outward from the main body 11 of the stator core 10 in the radial direction, the diameter of the stator structure 1 is reduced. Can be done. Therefore, according to the embodiment, it is possible to reduce the dimensional restrictions when attaching to the rotary electric machine, so that the attachability to the rotary electric machine can be improved.

In the embodiment, as shown in FIG. 3, an example is shown in which the lead wire holding portion 40 partially protrudes outward from the circumscribed circle C of the stator core 10 in the radial direction, but the entire lead wire holding portion 40 is circumscribed. It may be arranged inside the circle C. As a result, the lead wire holding portion 40 can be further suppressed from protruding outward from the main body portion 11 of the stator core 10 in the radial direction, so that the diameter of the stator structure 1 can be further reduced.

Further, in the embodiment, as shown in FIG. 2, the entwined portion 50a of the terminal 50 may extend in the same direction as the lead wire 100 faces (downward in the figure). As a result, it is possible to secure a wide space for providing a rotating object or the like on the side (upper side in the drawing) opposite to the direction in which the entwined portion 50a and the lead wire 100 are directed in the axial direction.

Therefore, according to the embodiment, the mountability to the rotary electric machine can be further improved.

Further, in the embodiment, as shown in FIG. 2, a through hole 40b penetrating in the axial direction is formed in the lead wire holding portion 40. Here, when the end of the winding wound around the teeth 12 is entwined with the entwined portion 50a of the terminal 50, a slack pin (not shown) is inserted into the through hole 40b in advance. Then, the end of the winding is entwined with the entwined portion 50a while bypassing the winding with the slack pin, and then the slack pin is removed to form a predetermined slack in the winding.

As a result, even when the winding is heat-shrinked, it is possible to prevent the winding from being cut due to the formed slack. Therefore, according to the embodiment, the reliability of the stator structure 1 can be improved.

The through hole 40b is formed along the through hole 11c formed in the main body 11 of the stator core 10. Further, as shown in FIG. 3, the through hole 40b is formed as three small through holes on the side where the entangled portion 50a extends, while the entangled portion 50a extends as shown in FIG. On the non-existing side, it is formed as one through hole extending in the circumferential direction.

Further, although not shown in FIG. 2 or the like, a protective cover that covers the periphery of the entwined portion 50a and protects the entangled portion 50a may be separately provided.

(Assembly process of stator structure and resolver)
Next, the assembly process of the stator structure 1 and the resolver according to the embodiment will be described. First, the stator core 10 formed by laminating a plurality of steel plates is set in a predetermined mold and insert-molded with an insulating resin to form an insulator 20 that covers the stator core 10 from both sides in the axial direction.

Subsequently, the coil 30 is wound around the teeth 12 with respect to the structure composed of the stator core 10 and the insulator 20. In this step, a coil 30 having a predetermined number of turns is wound around each tooth 12, and a slack pin is inserted into the through hole 40b.

Then, the end of the predetermined winding is entwined with the entwined portion 50a of the predetermined terminal 50 while bypassing the winding with the slack pin, and TIG welding or the like is performed. After that, the slack pin is removed from the through hole 40b to obtain the stator structure 1.

Subsequently, as shown in FIG. 4, the resolver 3 is obtained by providing the rotor 2 inside the obtained stator structure 1. FIG. 4 is a top view showing the configuration of the resolver 3 according to the embodiment. The resolver 3 according to the embodiment is a VR (Variable Reluctance) type resolver, and the rotor 2 is fixed to an output shaft of a rotary electric machine and rotates as the output shaft rotates. Thereby, the rotation angle of the output shaft of the rotary electric machine can be detected.

Subsequently, the lead wire 100 is attached to the lead wire holding portion 40. FIG. 5 is a perspective view showing a state when the lead wire 100 is attached to the lead wire holding portion 40. As shown in FIG. 5, the lead wire 100 is inserted into the notch 40a, and the core wire 100a of the lead wire 100 is brought into contact with the connection portion 50b (see FIG. 2) of the terminal 50. At this time, the lead wire 100 is not bent.

Then, resistance welding is performed on the core wire 100a in contact with the connecting portion 50b. Specifically, the electrode for resistance welding is brought into contact with the exposed portion 50c (see FIG. 3) in which a part of the anti-joining surface of the flat plate-shaped connecting portion 50b is exposed from the lead wire holding portion 40, and the core wire 100a is formed. Weld to the connection portion 50b.

Here, in the embodiment, as shown in FIG. 2, the connecting portion 50b of the terminal 50 extends in the radial direction. As a result, when the core wire 100a is resistance welded, the stator structure 1 is placed on the workbench as it is and resistance welding is performed from above without fixing it to a special workbench and performing resistance welding from a direction in which it is difficult to work. Can be done.

Therefore, according to the embodiment, the workability when assembling the lead wire 100 to the stator structure 1 can be improved by extending the connecting portion 50b in the radial direction.

Further, in the embodiment, as shown in FIG. 5, in the lead wire holding portion 40, the cutout portions 40a are formed in a straight line. Thereby, when the lead wire 100 is resistance welded to the connection portion 50b of the terminal 50 exposed from the notch portion 40a, the electrode used for such resistance welding can be easily applied to the connection portion 50b.

Therefore, according to the embodiment, workability when assembling the lead wire 100 to the stator structure 1 can be improved.

Then, after the core wire 100a is resistance welded to the connecting portion 50b, as shown in FIG. 1, the lead wire 100 is bent inside the notch portion 40a along the axial direction and held inside the notch portion 40a. .. In this way, by bending the lead wire 100 inside the notch portion 40 having an L-shaped cross section, the lead wire 100 can be easily bent in the axial direction.

By the steps shown so far, the assembly steps of the stator structure 1 and the resolver 3 are completed. In the above-described embodiment, an example in which the lead wire 100 is connected to the stator structure 1 after the rotor 2 is attached to the stator structure 1 has been shown, but the rotor 2 is connected to the stator structure 1 after the lead wire 100 is connected to the stator structure 1. It may be attached to.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the embodiment, the example in which the insulator 20 is integrally formed is shown, but the insulator 20 may be formed by being divided into two in the axial direction, and the stator core 10 may be sandwiched between the two insulators. ..

Further, in the embodiment, the coil cover that covers and protects the coil 30 from both sides in the axial direction is not particularly provided, but such a coil cover may be provided separately. Further, in the embodiment, the case where the present invention is applied to the inner rotor type resolver 3 is shown, but the present invention may be applied to the outer rotor type resolver.

As described above, the stator structure 1 according to the embodiment includes a stator core 10, an insulator 20, a coil 30, a lead wire holding portion 40, and a terminal 50. The stator core 10 has an annular main body portion 11 and a plurality of teeth 12 extending radially from the main body portion 11. The insulator 20 covers the plurality of teeth 12 from both sides in the axial direction of the stator core 10. The coil 30 is wound around each of the plurality of teeth 12 via the insulator 20. The lead wire holding portion 40 is held so that the lead wire 100 faces in the axial direction. The terminal 50 includes a entwined portion 50a extending in the axial direction and entwining the ends of windings forming the coil 30, and a connecting portion 50b housed in the lead wire holding portion 40 and to which the lead wire 100 is connected. The entangled portion 50a is arranged inside the circumscribed circle C of the stator core 10. Thereby, the mountability to the rotary electric machine can be improved.

Further, in the stator structure 1 according to the embodiment, the entwined portion 50a of the terminal 50 extends in the same direction as the lead wire 100 faces. As a result, the mountability to the rotary electric machine can be further improved.

Further, in the stator structure 1 according to the embodiment, the connecting portion 50b of the terminal 50 extends in the radial direction. As a result, workability when assembling the lead wire 100 to the stator structure 1 can be improved.

Further, in the stator structure 1 according to the embodiment, the lead wire holding portion 40 is formed with a cutout portion 40a in which one side in the axial direction and one side in the radial direction are cut out in a substantially L-shaped cross section, and the cutout portion 40a is formed. The core wire 100a connected to the connecting portion 50b internally extends in the radial direction, is bent inside the notch portion 40a, and extends axially inside the notch portion 40. As a result, the lead wire 100 can be easily bent in the axial direction.

Further, the resolver 3 according to the embodiment includes a rotor 2 and the above-mentioned stator structure 1. As a result, it is possible to realize the resolver 3 having improved attachability to the rotary electric machine.

Moreover, the present invention is not limited by the above-described embodiment. The present invention also includes a configuration in which the above-mentioned constituent elements are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

1 stator structure, 2 rotors, 3 resolvers, 10 stator cores, 11 main body, 11a recesses, 12 teeth, 20 insulators, 30 coils, 40 lead wire holders, 40a notches, 50 terminals, 50a entanglements, 50b connections , 100 lead wire, 100a core wire

Claims (3)

A stator core having an annular main body and a plurality of teeth extending in the radial direction from the main body.
An insulator that covers the plurality of teeth from both sides in the axial direction of the stator core,
A coil wound around each of the plurality of teeth via the insulator,
A lead wire holding portion that holds the lead wire so as to face the axial direction,
A entwined portion extending to one side in the axial direction and entwining the ends of windings constituting the coil, and a lead extending to one side in the radial direction and housed in the lead wire holding portion. A terminal having a connecting portion to which a wire is connected and having the entwined portion arranged inside the circumscribed circle of the stator core.
Bei to give a,
The entwined portion of the terminal extends in the same direction as the lead wire faces.
The lead wire holding portion is formed with a notch portion in which one side in the axial direction and one side in the radial direction are cut out in a substantially L-shaped cross section.
In the lead wire, a core wire connected to the connection portion extends radially inside the notch portion, is bent inside the notch portion, and is located on the other side in the axial direction inside the notch portion. Prolonged,
The core wire is exposed on one side in the axial direction.
Stator structure. The stator core forms a plurality of recesses recessed from the outer peripheral portion to the inner peripheral side of the main body portion.
The lead wire holding portion is arranged in the recess of the stator core.
The stator structure according to claim 1. With the rotor
The stator structure according to claim 1 or 2,
With a resolver.

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