JPH0744804B2 - Motor lead wire drawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is intended to quickly and easily connect a lead wire and a lead wire of a stator winding of an electric motor, and to strengthen the pull-out strength of the lead wire. The improvement of the lead wire drawing device in the electric motor.

[Conventional technology]

Generally, as an insulating means between the stator core of the electric motor and the stator winding, one slot insulation is inserted into each slot of the stator core, and then the stator winding is inserted into each slot. The stator winding was assembled by fitting it over again, but it not only took time to assemble the stator winding, but the slot insulation sometimes fell off from the slot portion when the stator winding was inserted. .

For this reason, recently, in place of the slot insulation, synthetic resin having excellent insulation and heat resistance is used, and the slots and yokes of the stator core, the stator windings, and the wiring between the windings (crossover wires). ), A stator core that holds a required insulation distance by using resin molding has been used. In the above-mentioned insulating means, since sufficient insulation is ensured between the stator winding and the stator core, the stator winding should be wound close to the laminated end face side of the stator core. Since it is possible to reduce the circumference of the stator winding as a whole, there is an advantage that the stator winding can be downsized and the amount of electric wire for coil winding can be reduced. .

[Problems to be Solved by the Invention]

However, even when a stator winding is wound using the resin-molded stator iron core, for example, as shown in FIG. After connecting the lead wire 2 to be connected by soldering, crimping terminal, or the like, the connecting portion is covered with, for example, a protective tube 3 such as a varnish tube, and the protective tube 3 is further provided with a binding string 4 or tape. And stator winding 1
Since it was necessary to manually clamp the coil end portion 1a to fix the connecting portion, it takes time to connect the lead wire, and since the protective tube 3 is used, the number of parts is increased. There was a problem.

Further, when the connection portion is squeezed, it is necessary to firmly squeeze it so as to withstand the pull-out strength of the lead wire. Moreover, in the binding operation, the binding force is not constant for each worker, and if the binding thread is loosened and external force is applied to the connection portion for many years, the lead wire may be pulled out.

In order to solve the problem of disconnection of the lead wire, for example, Japanese Utility Model Publication No. 57-28529 filed by the applicant of the present invention discloses a lead wire insertion hole at one end and a coil end portion at the other end. Insert a vertically long lead receiving plate with a through hole through which a binding cord for binding is inserted into the slot of the stator core, and attach this lead receiving plate to the stator core with a binding cord so that it cannot be removed. There is one in which the pull-out strength of the lead wire is increased by pulling out the lead wire connected to the lead wire through the insertion hole of the lead receiving plate. In this lead wire retaining structure, when the lead wire is passed through the insertion hole of the lead receiving plate, the lead wire is received by the corner portion of the insertion hole, so that external force does not adversely affect the connection portion with the lead wire. On the other hand, on the other hand, in addition to the protective tube that covers the connection part, a lead receiving plate must be prepared separately, and in addition, work for attaching the lead receiving plate to the stator core is required. It was difficult to improve the productivity and the production cost was raised.

In view of the above problems, the present invention covers the connecting portion between the lead wire and the lead wire with a protective tube, or in order to increase the mechanical strength of the connecting portion, the binding force is increased by a binding string, or It is an object of the present invention to provide a lead wire drawing device for an electric motor, which makes it possible to increase the pull-out strength of the lead wire with a simple structure without using a lead receiving plate.

[Means for Solving the Problems]

According to the present invention, in the stator core obtained by resin-molding a portion of the stator core, which is in contact with the stator winding, such as a slot portion and a yoke portion, with a synthetic resin, the stator core is fixed to the peripheral edges on both sides of the laminated end surface. A pair of housing cylinders for housing the lead wire of the child winding and the connecting portion of the lead wire are projected into the resin mold part in parallel with the axial direction of the stator core and with a space allowing the lead wire to be inserted. A notch for locking the lead wire connected to the lead wire is provided in the opposing portion of the storage cylinder, and the stator core is provided between the storage cylinders formed by sandwiching the stator core. The lead wire drawing cylinder made of resin is integrally molded with the housing cylinder in a state of being penetrated and supported by the housing to form a housing cylinder, and further, from the portion where the housing cylinder is located.
At the end surface position of the stator core 180 ° apart, an insertion cylinder for inserting the crossover wire part of the stator winding is integrally molded with the resin mold part to form a stator core like the lead wire drawing cylinder. This is a lead wire drawing device that is supported by penetrating it, and its operation is as follows.

[Action]

The lead wire connected to the lead wire of the stator winding is housed in the housing cylinder of the housing cylinder in which the connecting portion is integrally formed with the resin mold portion of the stator core, and in this state, only the lead wire is The stator core is pulled out from the housing cylinder in the direction opposite to the direction in which the connecting part is housed, and the lead wire is further locked in the notches provided at the opposite parts of the housing cylinder, between the housing cylinders. It is designed to be pulled out by inserting it into a lead wire pull-out tube that is supported by penetrating through the lead wire. By storing the connection part of the lead wire with the lead wire in the storage cylinder, there is no need for a protective tube covering the connection part. In addition, the lead wire can be pulled out with the pull-out strength increased by locking the lead wire in the notch of the housing cylinder, and further, the lead wire connection portion can be housed or locked when the lead wire is drawn out. A storage cylinder with a notch to The lead wire of the stator winding is connected to the lead wire by integrally molding the housing cylinder body including the lead wire lead-out tube that is supported through the stator core with the resin mold portion of the stator core. The part can be easily and economically covered without using a protective tube covering it, and moreover, the lead wire itself can be inserted through the lead wire pull-out tube of the storage tube body. It is characterized in that it is pulled out from the electric motor with a stronger pull-out strength.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

First, in FIG. 1, reference numerals 11 and 12 denote brackets of an electric motor, and the brackets 11 and 12 are formed so as to be connectable by performing draw forming using a mold, and one of the brackets 12 has Through hole through which the rotor shaft 13 of the electric motor passes
14 are perforated. Reference numeral 15 denotes a rotor provided by laminating a required number of silicon steel plates, and the brackets 11 and 12 are mounted via the rotor shaft 13.
It is rotatably supported by bearings 16 and 16 mounted on the self-centering structure. Reference numeral 17 denotes a stator core around which a stator winding 23 is wound, which is supported and fixed in the brackets 11 and 12, and its structure is shown in FIGS. 3 to 5 as a stator core of a kumadori coil type induction motor. An example of implementation will be described.

In FIG. 4, a silicon steel plate is punched out, for example, for a two-pole electric motor, and a predetermined number of the steel plates are laminated to form a stator core 17, and a magnetic pole portion of the stator core 17 is attached with a not shown shading coil. , Injection molding, etc. on the outer surface of the stator core 17 (excluding the inner and outer peripheral surfaces) with synthetic resin so as to extend from both axial end surfaces of the stator core 17 to the slot portion 18 and cover these parts. Insulation by resin molding with
Forming 19. 20 is an outer peripheral edge of the insulator 19, an outer peripheral wall integrally formed with the insulator 19 along the circumferential direction of the stator core 17, and 21 is also an inner peripheral edge of the insulator 19, the stator core The inner peripheral wall is formed by partially projecting along the circumferential direction of 17. Reference numeral 22 denotes a storage cylinder formed integrally with the insulator 19 on one side between the magnetic poles of the stator iron core 17 and protruding on both sides in the axial direction of the stator iron core 17 by a constant length. As shown in FIG. 3, FIG. 4 and FIG. 7, the housing cylinder 22 has a lead wire 24 of the stator winding 23 wound around the stator core 17 and a lead wire connected to the power source side. As shown in FIG. 7, storage cylinders 27, 27a having a bottomed cylinder for storing the connection portion 26 with 25 are integrally formed with a space for passing the lead wires (two) 25 therebetween, And the storage tube 2
As shown in FIG. 7, between 7 and 27a, a resin lead capable of penetrating the stator core 17 and inserting and pulling out the lead wire 25 from any direction of the stator core 17. The wire drawing cylinder 28 is formed integrally with the storage cylinders 27, 27a. 29
Is a notch groove for passing the lead wire 24 notched on the outer surface of each storage cylinder 27, 27a, and 30 is the tip side of the storage cylinders 27, 27a in the opposite direction (inside) as shown in FIG. It is a notch for making a V-shaped incision and locking the lead wire 25. Reference numeral 31 is a position separated from the accommodating cylinder 22 by about 180 °, and as shown in FIG. 5, a crossover portion 32 of the stator winding 23 integrally formed with the insulator 19 by penetrating the stator core 17 is formed. It is an insertion tube for inserting.

Reference numeral 33 shown in FIG. 2 is a binding string for binding the coil end portion 23a of the stator winding 23 wound around the stator iron core 17 in a direction in which the coil end portions 23a straddle the stator iron core 17 and approach each other. Bondage.

Next, the operation will be described.

When the stator winding 23 is wound around the stator core 17 and the lead wire 25 is connected to the stator winding 23, as shown in FIG. 3, a storage cylinder integrally formed with the insulator 19. Lead-out wires 24, 24 at the beginning and end of the stator winding 23 are led to the position 22 and the lead-out wires 24, 24 are connected to the lead wire 25 at this position.
After winding several times around the insulating coating near the core wire portion at the tip, the core wire portion of the lead wire 25 is wound a required number of times, and the lead wire 24 and the core wire portion of the lead wire 25 are connected by soldering. Subsequently, as shown in FIG. 7, the connection portion 26 between the lead wire 25 and the lead wire 24 to which the solder has been applied is inserted into the storage cylinders 27, 27a from the tip end side of the storage cylinder body 22. At that time, the storage cylinders 27, 2
Since the notch groove 29 is notched in the outer portion of 7a, the connecting portion
When 26 is inserted, the lead wire 24 passes through the notch groove 29 and moves to the third position.
As shown in FIG. 7 and FIG.
It is possible to enter into 27, 27a without tension. As described above, by storing and holding the connecting portion 26 between the lead wire 25 and the lead wire 24 in the storage cylinders 27, 27a, the connecting portion 26 of the lead wire 25 is in an insulated state without being covered with a protective tube or the like. Can be maintained well. After that, the lead wire 25 is fitted into a V-shaped notch 30 which is notched in the mutually opposing directions of the housing cylinders 27, 27a, and the lead wire is supported through the stator core 17 through the gap between the housing cylinders 27, 27a. Insert into the wire drawing cylinder 28. That is, as shown in FIG. 7, each lead wire 25 is bent in a U-shape, and the lead wire lead-out is carried out in a state where the insulating coating portion a at the rear end of the connection portion 26 is locked in the V-shaped notch 30. The lead wire 25 is inserted into the cylinder 28 and is pulled out from the gap between the accommodating cylinders 27 and 27a on the opposite side where the connection portion 26 is not accommodated.

The lead wire 25 pulled out from the storage cylinder 22 as described above.
In the state where the connecting portion 26 is stored and held in the storage cylinders 27 and 27a, the insulating coating portion a can be locked by the notch 30 of the storage cylinders 27 and 27a and can be pulled out. Even if the lead wire 25 is pulled strongly, the insulating coating portion a of the lead wire 25 is locked in the notch 30 of the storage cylinders 27, 27a.
There is no possibility that the connecting portion 26 will be pulled out from the storage cylinders 27, 27a, and the connection between the stator winding 23 and the lead wire 24 will not be broken, and the lead wire 25 can be pulled out by increasing its pull-out strength. .

Next, as shown in FIG. 5, the crossover portion 32 of the stator winding 23 may be inserted into an insertion cylinder 31 provided on the opposite side of the housing cylinder 22. As described above, the lead wire of the lead wire 25
After connecting with and pulling out from the stator 24, the stator winding 23 is tightly bound by the binding string 33, and the winding work of the stator winding 23 is completed.

In addition, when the lead-out direction of the lead wire 25 is changed due to a power source or the like not shown, the lead-out wire 24 of the stator winding 23 is accommodated in the connecting portion 26 from the state of FIG. 7 in FIG. It is drawn out to the side of the storage cylinder 27, 27a on the opposite side which is not formed, and the lead wire 25 is connected at that position, and the lead wire 25 is drawn out from the lead wire drawing cylinder 28 from the upper side to the lower side in FIG. Of course, you may do so. Moreover, if the electric motor itself is of the kumadori coil type as in the present embodiment, when the lead wire 25 is pulled out in the opposite direction, the kumadori coil (not shown) will be in the opposite direction, so that it will rotate easily. The rotation direction of the child 15 can be changed.

Further, in the present embodiment, an example in which two lead wires 25 are drawn has been described, but when two or more lead wires are drawn out, for example, when a tap conductor is drawn from the stator winding 23. The present invention can be realized even if another housing cylinder is integrally formed with the insulator 19 at the position of the insertion cylinder 31 shown in FIG. 2 and the lead wire connected to the tap conductor is drawn out. .

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

According to the present invention, an insulator is formed by resin-molding a synthetic resin in a slot portion of a stator core around which a stator winding is wound, including an end face in the axial direction of the stator core. Since the housing tube for housing the connecting portion between the lead wire of the stator winding and the lead wire is integrally formed, the connecting portion between the lead wire and the lead wire is formed by an insulating tube as in the conventional case. Since it is sufficient to insert the connecting portion itself into the storage cylinder in one operation without covering with and binding to the stator winding,
It is possible to quickly and reliably connect and draw out the lead wire drawn from the stator winding and the lead wire.

In addition, since the lead wire lead-out tube, which is formed through the insulator and has a space for the lead wires to pass through and is supported through the stator core, is integrally formed, The lead wire in which the connection portion with the wire is housed in the housing cylinder is made to make a U-turn at the upper end of the housing cylinder in a state where the connection portion is housed in the housing cylinder, that is, bent into a U-shape and stored as it is. Since the lead wire is inserted and drawn out into the lead wire drawing cylinder integrally formed with the lead wire, the lead wire is folded back and drawn out at the upper end of the storage cylinder, and as a result, the lead wire can be strongly hooked at the folded part. The pull-out strength can be made stronger than necessary without using a special hooking means, and can be pulled out.

, Moreover, the lead wire drawn out as described above is
For example, when a force is applied to the lead wire to return the lead wire in the direction of the storage cylinder, the lead wire is connected to the lead wire drawing cylinder, the folded portion at the upper end of the storage cylinder, and the bottomed cylindrical storage cylinder. Since the lead wire is not supported and supported by the bottom surface and never returns in the direction of the connection part, even if the lead wire is pulled or pulled back by the action of external force as described above, the lead wire itself does not pull out. It is possible to reliably eliminate the adverse effects such as disconnection of the connecting portion with the lead wire.

Further, according to the present invention, both a storage cylinder that stores a connecting portion that connects a lead wire and a lead wire of a stator winding and a lead wire lead-out cylinder that supports the lead wire through the stator core are both the stator core. Since it can be formed integrally with the insulator when the above-mentioned insulator is coated, it is convenient and economical to manufacture.

In addition, in order to make the connection of the lead wire with the lead wire good, the storage cylinder that houses the connecting portion connecting the lead wire and the lead wire of the stator winding is placed in the lead-out direction side of the lead wire. Since the notch groove is formed, the lead wire drawn from the stator winding is directly connected to the lead wire above the stator core, and the connecting portion is pulled out by passing the lead wire through the notch groove. The wire storage cylinder can be easily inserted into the storage cylinder without being pulled up to the upper end. As a result, after the winding of the stator winding, the lead wire connected to the lead wire is housed in a housing cylinder in which the connecting portion with the lead wire is formed by using the cutout groove, and then, The lead wire can be easily pulled out to the outside of the stator core through the lead wire lead-out tube that is bent into a U-shape and is connected to the storage tube, so that the lead wire can be connected and drawn out quickly and easily. The removal of the lead wire itself can be reliably prevented, and
When pulling out the lead wire, the lead wire can be swiftly removed without using an insulating tube, binding thread, etc. as in the past.
It is possible to pull out without fail and with a strong pull-out strength.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an electric motor provided with a lead wire drawing device of the present invention, FIG. 2 is a perspective view showing a state where a lead wire is drawn from a stator winding wound around a stator core, and FIG. FIG. 4 is a plan view of the same as above, FIG. 4 is a perspective view of a stator core provided with the lead wire drawing device of the present invention, FIG. 5 is a sectional view taken along line AA of FIG. 3, and FIG. FIG. 7 is a side view of the stator core showing the state, FIG. 7 is a cross-sectional view taken along the line BB of FIG. 3, and FIG. 8 is a perspective view of the stator core showing an example of a conventional lead wire drawn out state. 17 …… Stator core, 19 …… Insulator, 22 …… Storage cylinder, 23
...... Stator winding, 24 …… Leader wire, 25 …… Lead wire, 26
...... Connection part, 27 …… Storing tube, 28 …… Lead wire drawing tube,
31 …… Insertion tube

Claims (1)

[Claims] 1. A resin molding is performed by injection molding or the like on a slot portion 18 of a stator core 17 around which a stator winding 23 is wound, including both axial end faces of the stator core 17. An insulator 19 is formed, and a connecting portion between the lead wire 24 of the stator winding 23 and the lead wire 25 connected to the power source side is formed on the insulator 19.
A pair of bottomed cylindrical storage cylinders 27, 27a for storing 26, and the storage cylinders 27, 27a are formed integrally with each other with a space for the lead wire 25 passing through, and the stator core 17 A lead wire pull-out tube for inserting and supporting the lead wire 25 penetratingly supported and housing the connection portion 26 in the housing cylinders 27, 27a in a U-shaped bent state.
The storage cylinder 22 integrally provided with 28 is integrally formed with the insulator 19 along the axial direction of the stator core 17, and the storage cylinders 27 and 27a formed in the storage cylinder 22 are further formed. On the side of, a notch groove 29 for passing the lead wire 24 of the stator winding 23 is formed,
The lead wire 25, in which the connecting portion 26 connected to the lead wire 24 is housed in the housing cylinders 27 and 27a, is bent in a U shape at the upper end of the housing cylinders 27 and 27a and inserted into the lead wire drawer cylinder 28. A lead wire drawing device for an electric motor, characterized in that it is drawn outside the stator core 17.