JP2002218694A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which efficiently connects winding edges each other and has a structure in which the winding can be easily fixed to a stator. SOLUTION: A cylindrical ring 6 made of a steel sheet is placed on an insulator 3 which faces one side of a stator 1 concentrically with the stator 1. It is made in the structure that one side of the ring 6 is buried in the insulator 3, and the other side projects out from the surface of the insulator 3, and molded in one body together with the insulator 3. And, insertion holes 8 for inserting an end part 7 of a winding 5 through are made at positions corresponding to each winding 5 in the circumference part of the ring 6 projecting from the surface of the insulator 3. Next, the other end parts 7 of each winding 5 corresponding to three phases are inserted through the corresponding insertion holes 8 of the ring 6 respectively, and after bending the edges 7 90 degrees for temporary fixing, the bent edges 7 are connected with the ring 6 by soldering or welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator, and more particularly, to a motor having a structure for connecting ends of windings wound around teeth of the stator.

[0002]

2. Description of the Related Art Conventionally, an electric motor has a structure shown in a sectional view of FIG. The stator 81 has a plurality of teeth on the inner periphery of the yoke portion of the stator core. Slots are formed on both sides of the teeth to wind the winding 82. On the other hand, the rotor 83
Is composed of a permanent magnet, and has a rotation shaft 84 at the center thereof. Further, the tip surface 85 of the tooth portion facing the rotating shaft 84 and the outer peripheral surface 86 of the permanent magnet are opposed to each other with a gap therebetween, and the rotating shaft 84 of the rotor 83 is supported by bearings 87.
The bracket 88 to which the bearing 87 is fixed is fixed to the stator 81.
From both sides.

The stator 81 is, for example, shown in FIGS.
As shown in the figure, the stator is of a three-phase specification and has six teeth. In this stator 81, an insulator 90 is integrally formed with the stator 81 by molding. The insulator 90 covers the entire stator 81 except for the outer peripheral portion of the yoke portion 89 and the tip of the tooth portion. A winding 82 is wound around a portion of the insulator 90 corresponding to the tooth portion, and one end 82a of each of the windings 82 corresponding to the three phases is connected at one point (star connection). Has become. This connection portion 91 is formed by an end 82 a of the winding 82.
Are connected by soldering, covered with an insulating tube 92, and then fixed on the winding 82 with a binding thread 93.

However, if the tube 92 is covered,
The work of fixing on the winding 82 with the binding thread 93 is inferior in workability, while efficiently connecting the ends of the winding 82 together,
An electric motor having a structure that can be easily fixed to the stator 81 has been desired.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and to provide an electric motor having a structure in which the ends of windings are efficiently connected to each other and which is easily fixed to a stator. It is an object.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides slots on both sides of a plurality of teeth provided on the inner periphery of a yoke portion of a stator core, and forms slots on the teeth. A stator having a slot excluding the tip and the upper and lower surfaces of the stator core covered with an insulator, winding a winding around a portion corresponding to the slot, and having a connection portion where the ends of the winding are connected. A motor provided with a rotor having a rotating shaft at the center, and a bearing that supports the rotating shaft of the rotor, and a bracket attached from both sides of the stator.
A cylindrical ring made of a metal plate is provided on the insulator covering one of the upper and lower surfaces of the stator, and the connection portion is connected to the cylindrical ring.

[0007] The ring is embedded in the insulator.

[0008] An insertion hole for inserting an end of the winding is provided in a circumferential surface of the ring.

A notch is provided in the ring from the insertion hole toward an end surface of the ring.

The insulator is molded integrally with the stator core.

The insulator is a molded product made of a synthetic resin, which is divided into two parts and the stator core is mounted from above and below.

The ring is disposed concentrically with the stator.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric motor according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view (A) showing an embodiment of a stator of an electric motor according to the present invention, and is a view (B) taken along the line AA ′. For example, a three-phase stator 1 has six teeth 2 as shown in FIG. An insulator 3 is integrally formed on the stator 1 by molding with the stator 1. This insulator 3
Is the stator 1 except for the outer peripheral portion of the yoke portion 4 and the tip of the tooth portion.
And the teeth 2 on the insulator 3
The winding 5 is wound around the portion corresponding to. Further, a cylindrical ring 6 made of a steel plate is provided concentrically with the stator 1 on the upper surface of the insulator 3. This ring 6
Has a structure in which one end face in the direction of the rotation axis is embedded in the insulator 3 and the other end face protrudes from above the insulator 3, and is integrally formed when the insulator 3 is formed. In the circumferential portion of the ring 6 protruding from above the insulator 3, an insertion hole (not shown) for inserting the end 7 of the winding 5 is provided at a corresponding position of each winding 5. I have.

Next, a method of connecting the ends of the windings in the above configuration will be described. In FIG. 1 (B), one end 7 of each winding 5 corresponding to three phases is inserted into the corresponding insertion hole 8 of the ring 6, and the end 7 is folded 90 degrees for temporary fixing. To sing. Next bent end 7 and ring 6
And are connected by soldering or welding. In this example,
Six windings 5 are formed, and one end 7
Is connected via a metallic ring 6 with the neutral point as a neutral point.

The connection portion connected at one point (star connection) by the metallic ring 6 is integrally formed with the insulator 3 by electrically connecting one end 7 of each winding 5. Since it is fixed to the ring 6, connection and fixing can be performed simultaneously. Further, since the ring 6 is disposed concentrically with the stator 1, one end 7 of the winding 5 disposed concentrically with the stator 1 can be connected with the shortest distance. . As described above, according to the structure of the present invention, it is possible to provide an electric motor having a structure in which the ends 7 of the windings 5 are efficiently connected to each other and which is easily fixed to the stator 1. Also ring 6
Has a structure in which one end face protrudes from above the insulator 3, so that the plastic insulator is hardly melted even by soldering or welding. Further, by performing the processing described later on this end face, the end 7
Can be easily fixed to the ring 6.

In the above example, the connection portion according to the present invention is used as a neutral point. However, the present invention is not limited to this, and may be used, for example, when connecting the ends of windings having the same phase. Can obtain the same effect. Further, when there are a plurality of windings having the same phase, it is possible to cope with the problem by arranging a plurality of rings having different diameters concentrically with the stator.

In the above example, the insulator 3
Has been described as an example integrally molded with the stator 1 by means of a mold. However, the present invention is not limited to this, and it is also possible to use an insulator made of a plastic resin and divided into two parts and the stator core is mounted from above and below. In this case, when this molded product is molded by a mold, the ring is integrally molded with the molded product.

FIG. 2 is a sectional view of a main part showing a structure for fixing an end 7 of a winding (not shown) to a ring 6, and FIG. 2A and FIG. FIG. 2B showing an embodiment.
It is. In the second embodiment, in FIG.
A notch 22 is provided with a width slightly smaller than the diameter of the end 7 of the connected winding from the insertion hole 20 described in (B) toward the end face of the ring 21. By press-fitting the end 7 of the winding from the open end of the notch 22, the end 7 can be temporarily fixed to the ring 21. Since there is no need to bend the work, the work can be simplified. After the temporary fixing, the ring 21 and the end 7 are connected by soldering or welding.

In the third embodiment, in FIG. 2 (B), the diameter is slightly smaller than the diameter of the end 7 of the connected winding from the insertion hole 30 to the end face of the ring 31 described in FIG. 1 (B). A notch 32 is provided in the width. Further, second notches 33 are provided on both sides of the notch 32. After press-fitting the end 7 of the winding from the open end of the notch 32, a bent piece 34 formed between the notch 32 and the second notch 33 is bent inside the notch 32. The end 7 of the winding is fixed to the ring 31 by crimping. For this reason, soldering or welding becomes unnecessary, and automation by a machine becomes possible.

[0020]

As described above, according to the motor of the present invention, slots are formed on both sides of a plurality of teeth provided on the inner periphery of the yoke of the stator core, and the ends of the teeth are removed. The upper and lower surfaces of the slot and the stator core are covered with insulators, windings are wound around portions corresponding to the slots, and a stator having a connection portion in which ends of the windings are connected to each other, and a rotating shaft at the center. A motor provided with a rotor and a bearing that supports the rotating shaft of the rotor, and a bracket attached from both sides of the stator, on an insulator that covers one of the upper and lower surfaces of the stator. By providing a cylindrical ring made of a metal plate and connecting the connecting part to the cylindrical ring, the ends of the windings are connected efficiently and the structure is simple to fix to the stator. Motor can be provided .

[Brief description of the drawings]

FIG. 1A is a plan view and FIG. 1B is a sectional view showing an embodiment of a motor stator according to the present invention.

FIGS. 2A and 2B are cross-sectional views of main parts showing another embodiment of the stator ring according to the present invention, wherein FIG. 2A is a second embodiment and FIG. 2B is a third embodiment.

FIG. 3 is a sectional view showing a conventional electric motor.

FIG. 4 is a perspective view showing a stator of a conventional electric motor.

FIG. 5 is a circuit diagram showing windings of a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Tooth part 3 Insulator 4 Yoke part 5 Winding 6, 21, 31 Ring 7 End 8, 20, 30 Insertion hole 22, 32 Notch 33 Second notch 34 Folded piece

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 15/12 H02K 15/12 EF term (reference) 5H002 AA07 AC07 5H603 AA03 AA09 BB01 BB07 BB12 CA01 CB04 CB18 CB26 CC11 CC17 CD21 CE01 EE01 FA16 5H604 AA05 AA08 BB01 BB14 CC01 CC05 CC16 PB03 QA04 QA06 QA08 QB14 5H615 AA01 BB01 BB14 PP01 PP08 PP10 PP14 PP15 PP24 PP25 PP28 QQ02 QQ19 RR01 SS16 SS18 SS44

Claims (7)

[Claims] 1. A slot is formed on both sides of a plurality of teeth provided on an inner periphery of a yoke portion of a stator core, and upper and lower surfaces of the slot and the stator core excluding tips of the teeth are covered with insulators. A winding is wound around a portion corresponding to the slot, and a stator having a connection portion in which ends of the winding are connected to each other, a rotor having a rotation shaft at the center, An electric motor comprising: a bearing that supports a rotating shaft; and a bracket attached from both sides of the stator. The motor includes: a cylindrical member formed of a metal plate on the insulator that covers one of upper and lower surfaces of the stator. An electric motor characterized in that the ring is provided and the connection portion is connected to the cylindrical ring. 2. The electric motor according to claim 1, wherein the ring is embedded in the insulator. 3. The electric motor according to claim 1, wherein an insertion hole for inserting an end of the winding is provided on a circumferential surface of the ring. 4. The electric motor according to claim 3, wherein a notch is provided in the ring from the insertion hole toward an end surface of the ring. 5. The electric motor according to claim 1, wherein the insulator is molded integrally with the stator core. 6. The electric motor according to claim 1, wherein the insulator is a molded product made of a synthetic resin, which is divided into two parts and the stator core is mounted from above and below. 7. The ring according to claim 1, wherein the ring is disposed concentrically with the stator.
An electric motor as described.