JP2000197297A - Stator of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an amount of insulation material to facilitate a binding work of insulation tubes and lead wires by cuffing both ends of a rectangular film and fastening the cuffed parts to the ends of an iron core and obtaining a specified space between coils and tooth sections of the iron core and then binding the coils with a binder string passed through the space. SOLUTION: An insulating material 6 is cut into a rectangular shape and then both end parts are folded back to form cuffs which allow the insulating material 6 to be fastened to both ends in the axial direction (stacked direction) of an iron core 1. Then, each coil 4 is wound around each tooth section 2 of the iron core 1 and a specified insulation space is secured between the ends of the iron core 1 and the coils 4. Next, a connection is covered with an insulation tube 9 and coil ends on both ends of the iron core 1 are bound with a binder string 7 such as a polyester fiber string. As a result, an amount of the insulating material can be remarkably reduced and therefore the connection 9 and a part of a lead wire 8 which is arranged in the iron core 1 can be fastened easily and firmly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor, and more particularly to a stator having a coil wound directly around each tooth of an iron core. And a stator suitable for the electric motor.

[0002]

2. Description of the Related Art A stator having a coil wound directly around each tooth of an iron core is configured as shown in FIG. 10, for example. In this figure, the stator has a plurality of teeth 2a.
And an iron core 1a having a slot 3a formed between the teeth, and a coil 4a wound around the teeth 2a via an insulating material 5a.

[0003] The iron core 1a is formed by joining and fixing an iron core piece divided for each tooth portion 2a in an annular shape after winding the coil 4a. As the insulating material, a film or the like bent along the shape of the slot 3a (not shown)
The inside of the iron core 1a is insulated by the insulating material 5a formed by injection molding or the like.
The fixed section at the axial end of the slot 3a is insulated from the end face of the iron core 1a.

The insulating material 5a includes a portion 5b for insulating the end face of the iron core 1a and a wall portion 5 for supporting the outer peripheral portion of the coil 4a.
c and a wall portion 5d that supports the inner peripheral portion. The coil 4a does not move much after winding,
Since it is easy to fall to the inner peripheral side or the outer peripheral side at the time of winding, it is wound using such wall portions 5c and 5d as a guide. The connection of the terminals of the coil 4a is usually made by arranging a printed wiring board above the coil end of the coil 4a and connecting the coil terminals to the pattern of the printed wiring board.

[0005]

The conventional stator as shown in FIG. 10 requires an insulating material for insulating both the inside of the slot 3a and the end face of the iron core 1a.
The insulating material for forming the wall portions 5c and 5d is also required as a guide for a, so that a large amount of insulating material is required for molding. For example, when used in an electric motor such as an air-conditioner or refrigerator hermetic electric compressor, it is necessary to suppress the extraction of low molecular components as oligomers. The refrigerant (HCFC) is changing to an alternative refrigerant (HFC), and the absolute amount of oligomers must be reduced more than ever before. In order to reduce the amount of the oligomer, a resin having excellent heat resistance is required. Since such an insulating material is expensive, there is a problem that the cost of a stator using a large amount of the insulating material increases. Also, using a large amount of the resin is generally not preferable because it leads to an increase in the absolute amount of the oligomer.

Further, when the current of the stator becomes large, the current capacity of the pattern of the printed wiring board becomes insufficient. Therefore, in a high-output motor, a connecting means instead of the printed wiring board and a new stator structure associated therewith are required. Desired.
In this case, in general, it is conceivable to adopt a configuration in which an insulated tube is placed over the connection portion and tied to the coil end to be fixed. Was expected.

[0007]

SUMMARY OF THE INVENTION The present invention comprises an iron core having a plurality of teeth and a slot formed between the teeth.
In a stator of a motor having a coil wound around an insulating material on the tooth portion, a strip-shaped film is mounted along the shape of the slot as the insulating material, and both ends of the film are mounted. Is folded back and locked to the end of the iron core to secure a required space between the coil and the tooth portion, and the coil is bound by a tying string passing through the space.

In the binding of the coil, at least one cross point of the tying string is provided at a break of the coil formed at the center of the slot.

[0009] Further, as a first configuration, a connecting portion between the coils and a connecting portion between the coil and the lead wire are covered with an insulating tube, and a part or all of the connecting portion is connected with the tying string. It is configured by binding together with the coil. As a second configuration, the connection portion is covered with an insulating tube, and part or all of the connection portion is embedded in the slot.

In the present invention, the configuration of the iron core and the coil of the stator may be, as a first configuration, the coil may be wound around the iron core divided for each tooth portion via the insulating material. As a second configuration, the coil may be wound around the iron core having a plurality of teeth integrally via the insulating material.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a stator according to the present invention, in which a stator has a plurality of teeth 2, an iron core 1 having a slot 3 formed between the teeth, and a tooth 2. And a coil 4 wound via an insulating material 6.

The coil end of the coil 4 is bound by a tying string 7 and its shape is maintained so that it is not easily moved or deformed. An insulating tube 9 is placed over the terminals of the coil 4 or the connection between the coil 4 and the lead wire 8, and is tied on the coil end by a tying string 7. The lead wire 8 can be firmly fixed by being drawn around and tied to the coil end to some extent, and at the same time, the connecting portion 9 is pressed down by the lead wire 8 so that it does not easily come out of the coil end.

FIG. 2 shows details of the iron core 1 and the insulating material 6 in the stator of FIG. The iron core 1 is constituted by iron core pieces 1 b divided for each tooth portion 2. This iron core piece 1b
Is formed by pressing and punching a large number of electromagnetic steel sheets and laminating them by a well-known clamping means or the like, in which projections formed by cutting and raising and punching provided at the same time as punching on each thin steel sheet are fitted to those adjacent to each other in the laminating direction. They are fixed to each other.

[0014] The insulating material 6 bent or curved along the shape of one side of the slot 3 is attached to a portion to be the slot 3 on both sides of the core piece 1b. This insulating material 6
Cuts a heat-resistant polyester film or the like into strips, turns both ends of the strip-shaped film back to form cuff portions 6b, and cuts the inside of the slot 3 by the portions 6a sandwiched between the cuff portions 6b at both ends. It is designed to be insulated. The cuff portions 6b are locked at both ends in the axial direction (stacking direction) of the core pieces 1b.

As described above, the coil is wound around the teeth of the iron core with the insulating material 6 attached to the iron core piece 1b. This state is shown in FIGS. As shown in FIG. 4, the height of the cuff portion 6b of the insulating material 6 is set so that a required insulating space 10 is secured between the end face of the iron core piece 1b and the coil 4. In order to wind in such a coil shape, a block type is inserted into a portion that should become the space 10,
A wall-shaped jig for preventing the coil 4 from falling down is mounted on the inner peripheral side and the outer peripheral side of the insulating material 6 and wound, and the jig is removed after the winding is completed. In the figure, reference numeral 4b denotes a terminal of the coil 4.

The iron core piece 1 on which the coil is wound as described above
b is joined and fixed in an annular shape by means such as welding, and is formed as the iron core 1 as previously shown in FIG. Thereafter, the connection between the terminals 4b of the coil 4 such as the crossover wire between the in-phase coils and the neutral point, and the connection between the terminal 4b and the lead wire 8 are made, and these connection portions are made of an insulating tube made of heat-resistant polyester or the like. 9 is put on.

After the connection is completed, the stator is set in a lacing apparatus, and the coil ends at both ends of the iron core 1 are bound by a tying string 7 such as a polyester braided string. For example, in the case of an apparatus of a type in which a racing needle is arranged on the inner diameter side of the iron core 1 to perform racing, as shown in FIGS.

In FIG. 5 and FIG. 6, since a required space 10 is formed between the tooth portion of the iron core 1 and the coil 4 by the cuff portion of the insulating material 6, the tying string 7a passed through this space 10 The coil ends are easily and firmly bound. Thereby, the deformation of the coil end is sufficiently suppressed. On the other hand, since the slit of the coil 4 is formed at the center of the slot, the cross point 7b of the tortoise-shaped tying string 7 is provided in this portion, so that the tightness of the coil end is improved and the fixing is further strengthened. Become. It is preferable that one or more cross points 7b are provided at the center of the slot, not only in the manner of binding in the shape of a tortoiseshell, but also in other binding methods. For example, in the case of an apparatus of a system in which a racing needle is arranged on the outer diameter side of the iron core 1 to perform racing, after binding the strap through a strap 10 to a space 10 of a specific coil 4, the needle is temporarily moved to an adjacent coil on the retreat side. By returning and rebinding the adjacent coils, a cross point 7b as shown in FIG. 6 can be formed.

As described above, the space 10 facilitates lacing, the coil ends can be tightly bound, and the number of crossing points of the tying string can be increased to cover the net, so that the coil 4 can be deformed after winding. In the lead-side coil end, as shown in FIG. 1, the connection portion 9 covered with the insulating tube and the lead-out portion of the lead wire 8 can be easily and firmly fixed.

FIG. 7 shows another embodiment of the present invention, in which an insulating material is attached to a stator core. In the case of the iron core 1c in this figure, the iron core is not divided for each tooth portion 2 but the entire iron core is integrally pressed. In such a case, the insulating material 11 bent or curved along the entire cross-sectional shape of the slot 3 is attached. By inserting the needle of the winding machine from the slot opening 13 between the tips of the teeth 2, a coil is wound around the iron core 1 c.

FIG. 8 shows the details of the insulating material 11. The material and the forming method are the same as those of the insulating material 6 shown in FIG. 2, and the cuff portion 11b and the insulating portion 11a inside the slot are formed.
It has. In the case of the insulating material 11, the cuff portion is formed in the insulating portion 11c along the tip portion of the tooth portion 2 because the circumferential length along the slot is long because the insulating material 11 is bent or curved along the shape of the entire slot. In this way, the formation of the cuffs 11b is facilitated by reducing the twist of the insulating material associated with the formation of the cuffs 11b. When the coil amount is large, the insulating portion 11c is replaced with the slot opening 13
By extending it to such an extent that it wraps around the portion, an appropriate creepage distance is obtained on insulation.

FIG. 9 shows another configuration of the connection portion in the present invention. Insulating tubes are placed over the connection portions 9a between the terminals of the coil 4 such as the crossover wires between the in-phase coils and the neutral point, and the connection portions 9b between the terminals of the coil 4 and the lead wires, as shown by broken lines. The connection portions 9a and 9b are inserted into the slots 3 of the iron core 1c. A wedge 12 having a U-shaped cross section made of an insulating film or the like is mounted in the slot 3, and the wedge 12 closes the slot opening 13 so that the connection portions 9a and 9b do not protrude to the inner peripheral portion. ing.

The coil end of the coil 4 is bound as shown in FIGS. 5 and 6, and more particularly, by providing the cross point 7b of the tying string 7 at the center of the slot 3, the connection portion 9a , 9b and the wedge 12 are prevented from protruding in the axial direction. Also, since the crossover wires and lead wires between the coils are routed on the coil end,
These also prevent the protrusion. The wedges 12 may be mounted as needed, but by mounting the wedges 12, in addition to the effects described above, a quality effect such as preventing contact between adjacent heterophase coils 4 can be provided.

The connection portions 9a and 9b as shown in FIG.
May be inserted entirely into the slot, but if necessary, a part thereof may be configured to be bound on the coil end as shown in FIG. FIG. 9 shows an example in which the iron core 1c which has been integrally pressed is used. However, the same can be applied to the case where the iron core 1 in which the above-mentioned divided iron core pieces 1b are joined and fixed is used. .

[0025]

According to the present invention, since a film material such as a heat-resistant polyester film is used as an insulating material for the stator core, a material having an excellent heat-resistant grade can be obtained at low cost. In addition, a member for insulating the end face of the iron core and an insulating member for forming a wall as a guide when winding the coil are not required, so that the amount of insulating material can be significantly reduced and the cost of the stator can be reduced. . Furthermore, in the case of a motor such as a hermetic electric compressor, the absolute amount of oligomer extraction is reduced, which contributes to the improvement of the performance of air conditioners and refrigerators.

Also, since a required space is secured between the coil and the iron core teeth, the binding with the tying string is facilitated,
Even for a motor with a large current capacity that cannot use a printed wiring board, it has the advantage that the work of binding the insulating tube and the lead wires can be easily achieved, and at the same time the cost required for the printed wiring board can be reduced. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a stator of an electric motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing details of an iron core and an insulating material in the stator of FIG. 1;

FIG. 3 is a plan cross-sectional view illustrating winding of a coil around a core tooth portion in the stator of FIG. 1;

FIG. 4 is a front view illustrating winding of a coil around a core tooth portion in the stator of FIG. 1;

FIG. 5 is a bottom view of the stator of FIG. 1;

FIG. 6 is an essential part front view for explaining binding of coils in the stator of FIG. 1;

FIG. 7 is a plan view showing another embodiment of the present invention in which an insulating material is attached to a stator core.

FIG. 8 is a perspective view showing details of the insulating material of FIG. 7;

FIG. 9 is an explanatory plan view of a stator showing still another embodiment of the present invention.

FIG. 10 is a perspective view of a stator showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Iron core 2 ... Tooth part 3 ... Slot 4 ... Coil 5a, 6, 11 ... Insulation material 7 ... Tether 8 ... Lead wire 10 ... Space

Claims (6)

[Claims] 1. A motor stator comprising: a plurality of teeth; an iron core having a slot formed between the teeth; and a coil wound around the teeth with an insulating material interposed therebetween. A strip-shaped film is mounted as an insulating material along the shape of the slot, and both ends of the film are folded back and locked to the ends of the iron core, so that a required space is provided between the coil and the teeth. A stator for an electric motor, wherein a space is secured and the coil is bound by a tying string passing through the space. 2. The stator for an electric motor according to claim 1, wherein at least one crossing point of the tying string is provided at a cut of the coil formed at the center of the slot. 3. A connection part between the coils and a connection part between the coil and the lead wire are covered with an insulating tube, and a part or all of the connection part is bound together with the coil by the binding string. A stator for an electric motor according to claim 1. 4. A connection part between the coils and a connection part between the coil and a lead wire are covered with an insulating tube, and a part or all of the connection part is buried in the slot. Or the stator of the electric motor according to 2. 5. The stator for an electric motor according to claim 1, wherein the coil is wound around the iron core divided for each tooth portion via the insulating material. 6. The stator for an electric motor according to claim 1, wherein the coil is wound around the iron core having a plurality of teeth integrated via the insulating material.