JP2002044896A - Electric motor stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high efficiency stator of an electric motor to be built in a totally-enclosed compressor with HFC enclosed inside as a refrigerant and to provide a low cost electric motor eventually. SOLUTION: In the slot of the stator of the electric motor built in the totally- enclosed compressor with HFC enclosed inside as a refrigerant the bobbin is partitioned as integrated fabrication, the winding as concentrated winding via the bobbin is prepared at the teeth of the stator, the dispersion-proof insulation cover to prevent the concentrated winding, draw-out wire and connectors from dispersing, and the fixture is partitioned to fasten and unify the bobbin with the dispersion-proof insulation cover. The dispersion-proof insulation cover is facilitated with the fixing method to ensure fastening the ventilation hole for the refrigerant with the draw-out wire, where the material of the bobbin and dispersion-proof insulation cover is of super-engineering plastic. All these specifications now develop the electric motor, high in efficiency and low in manufacturing cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of an electric motor disposed in a hermetic compressor, and more particularly to a structure of a molded insulation.

[0002]

2. Description of the Related Art Conventionally, as a structure of an electric motor of a hermetic compressor used for an air conditioner or a refrigerator, as shown in FIG. 10, a stator core 1 is formed by laminating a large number of thin plates in an axial direction and forming an outer periphery of the laminated body. Or a well-known auto-clamp system in which each thin plate is integrally fixed by welding or the like, and each thin plate is formed into a convex portion by pressing etc., and fitted into a concave portion formed on the opposite side of the convex portion of the adjacent thin plate and fixed integrally. And the like.

[0003] The stator core 1 includes a stator core 1 and a winding 2.
The insulation 2 is provided with a slot insulation 4, and the winding 2 is inserted into the slot insulation 4 mounted on the stator slot by a winding insertion machine. The windings 2 are provided with windings such as distributed windings, and interphase insulation 3 is provided between the windings so that there is no contact between the windings.

A lead wire 5 is connected to an end of the winding 2 drawn out from each phase by welding or soldering.
The lead wire 5 is connected to a casing terminal of the hermetic compressor. Since the winding portion of the winding 2 protrudes from the end of the stator core 1 across a plurality of slots, the winding is disturbed due to handling or the like. For this reason, the disorder of the winding and the connection point 6 between the lead wire 5 and the lead wire 5 drawn out from each phase are manually aligned and corrected. In addition, in order to correct the disturbance of the winding portion straddling the plurality of slots protruding from the end of the stator, shaping is performed by a shaping press machine or the like. Furthermore, the winding 2, the lead wire 5, the connection point 6, and the like are disturbed again if they are shaped, so that they are securely wound and fixed by the winding fixing string 7.
The winding fixing string 7 securely fixes the winding 2 and the connection point 6 by a machine (hereinafter abbreviated as a racing machine).

[0005]

In recent years, due to environmental problems and the like, refrigerants in hermetic compressors used in air conditioners and refrigerators have become a problem. Conventionally, CFC12, C
Although refrigerants such as FC22 have been used, HFC134a, HFC410a, HF
C407c and the like.

As the refrigerating machine oil in the hermetic compressor, naphthene-based, paraffin-based mineral oil, alkylbenzene-based oil, or the like has been used, but due to its structure, almost no water is dissolved. However, the use of a polyalkylene glycol-based oil, a polyester-based oil, an ether-based oil, or the like as the refrigerating machine oil for the refrigerant due to the structure of the refrigerating system or compatibility with the alternative refrigerant makes it easy to dissolve moisture.

As a result, a film such as polyethylene terephthalate (PET), which is a film used for a motor or the like, such as a slot insulating film 4 or an interphase insulating film 3, causes hydrolysis due to water dissolved in a refrigerant and a mixed oil, and the motor is insulated. Sex has been lost.

[0008] As another problem, in recent years, it has been desired to reduce the size, efficiency, and cost of an electric motor in a hermetic compressor used for air conditioners and refrigerators. In view of this, high efficiency materials are used for the steel sheet used for the stator core 1 and the rotor of the motor, and high efficiency materials are used, and the thickness of the steel sheet is reduced to reduce eddy current loss or fixed. Child core 1
Increase the occupancy of the winding 2 applied to the slot of
It has responded to the demand for smaller and more efficient motors. In addition, cost reduction has been realized by achieving miniaturization. Further, by using a brushless DC motor as the electric motor in the hermetic compressor, a permanent magnet having a high magnetic force has been adopted for the rotor.

However, when aiming for further miniaturization and higher performance of the electric motor, it is very difficult to cope with it by extending the conventional method. If the conventional method aims to further improve the performance, the performance does not improve for the cost.

When considering the loss of the electric motor, the loss can be roughly classified into iron loss and copper loss. According to the above-mentioned conventional method, iron loss has been improved. Was not done. In addition, as mentioned earlier, although the size of the motor has been reduced, the use of high-performance materials has made it unsuitable in terms of cost, resulting in a very high product unit price. I have.

In the workability in manufacturing the stator, the windings 2 protruding from the end of the stator core 1 straddling a plurality of slots are formed before the windings 2 of each phase are formed by a press or the like. Since the work of correcting the disturbance and bundling and aligning the lead wire 5 and the connection point 6 is manually performed, a large number of steps are required. After shaping by a shaping press machine or the like, the portion of the winding 2 protruding from the end of the stator core 1, the lead wire 5 and the connection point 6 are fixed by a racing machine. 7 stator core 1
The operator always checks whether the winding portion of the winding 2 protruding from the end, the lead wire 5, the connection point 6, and the like can be securely fixed by the racing machine.
Therefore, the cost is inevitably increased, and the product unit price is increased.

[0012]

Means for Solving the Problems HFC is sealed as a refrigerant of a hermetic compressor, a slot of a stator of an electric motor is provided with an integrally formed bobbin, and teeth of the stator are inserted through the bobbin through the bobbin. A winding by concentrated winding is provided, and a scattering prevention insulating cover is provided to prevent scattering of the winding, lead wire, connection point, and the like by the concentrated winding.The scattering prevention insulating cover includes the refrigerant and the refrigerating machine oil. And a fixing method for fixing the air vent and the lead wire through which the mist-shaped mixed oil flows, and the material of the bobbin and the insulating cover for preventing scattering is super engineering plastic (super engineering plastic). The stator of the motor.

[0013] Further, the stator of the electric motor is provided with a claw that can be hooked on at least one of the integrally formed bobbin and the scattering prevention insulating cover.

Further, a resin wall located on the inner diameter side of the scattering prevention insulating cover is connected in a ring shape, and the resin wall located on the outer diameter side of the scattering preventing insulating cover is largely cut away. I do.

Further, the bobbin integrally molded has a protruding portion, and after being fitted into a hole provided in the scattering prevention insulating cover, the protruding portion is welded and deformed to form the integrally formed bobbin. And a scattering prevention insulating cover is integrally fixed to the motor stator.

Further, in the integrally formed bobbin, the height of the coil protecting resin wall located on the stator inner diameter side is lower than that of the coil protecting resin wall located on the stator outer diameter side. Stator.

Further, as a fixing method for fixing the lead wire to the scattering prevention insulating cover, a concave cutout groove is provided from the outer diameter side of the scattering prevention insulating cover, and the inside of the concave cutout groove is formed. After the lead wire is fixed to the stator, the stator of the electric motor is covered with a resin wall for protecting the coil located on the outer diameter side of the stator of the integrally formed bobbin.

The resin wall located on the inner diameter side of the scattering prevention insulating cover is connected in a ring shape, and the resin wall located on the inner diameter side of the scattering preventing insulating cover is opposed to each slot opening of the stator core. The resin wall located on the inner diameter of the scattering prevention insulating cover and the bobbin are formed into an uneven shape so that the stator is fitted to the bobbin.

[0019]

Embodiments of the present invention are described below.
This will be described with reference to FIGS. In the present invention,
Components having the same structure in the stator or having the same meaning in practical use are denoted by the same reference numerals and description thereof is omitted. FIGS. 1 and 2 show the first embodiment of the present invention. FIG. 1 is a plan view showing a state in which the stator is completed, and shows the stator employed as the electric motor of the hermetic compressor. FIG. 2 is a diagram showing a state in which the winding 2 is wound around the bobbin 8 of the stator core 1 before attaching the scattering prevention insulating cover 9 of the present invention. The stator core 1 is provided with air holes 19 through which mist-like mixed oil of the refrigerant and the refrigerating machine oil flows. The end face of the stator core 1 and the inside of the slot are insulated by a bobbin 8 integrally formed. The bobbin 8 is provided with a winding 2 having insulation mainly composed of polyester or modified polyester. The winding 2
Is wound by a concentrated winding method in which the winding is wound directly on the teeth of the stator.

As a result, the winding portion of the winding 2 which jumps out of the end of the stator core 1 and straddles a plurality of slots is eliminated, so that the copper loss of the motor, which is difficult with the conventional distributed winding, can be greatly reduced. Becomes Therefore, since the winding portion of the winding 2 that protrudes from the end of the stator core 1 is reduced, the amount of the winding 2 used can be reduced.

Further, since the winding 2 is a concentrated winding in which the winding 2 is wound directly on the bobbin 8, the winding 2 is not disturbed, and the winding 2 can be aligned and wound. As a result, there is no need to disturb the winding 2 or to bundle and align the connection points 6 between the ends of the windings 2 extracted from the respective phases and the lead wires 5 which are conventionally performed manually. . In order to correct the turbulence of the winding 2 by a conventional shaping press machine or the like, the winding 2
However, since it is a concentrated winding in which the winding 2 is wound directly around the bobbin 8, it is not necessary to perform the shaping.

However, there is a problem in a method of fixing the winding 2 drawn out from each phase and the end of the winding 2 drawn out from the phase and the connection point 6 by the lead wire 5. Here, when it is attempted to fix the wire using the winding fixing cord 7 in the same manner as in the prior art, the lead wire 5 and the connection point 6 are placed on the end of the unstable winding 2 having a small area protruding from the end of the stator core 1. And so on, which is very difficult. In addition, the operator always checks whether the winding 2, the lead wire 5, the connection point 6, and the like protruding from the end of the stator core 1 can be securely fixed by the racing machine using the winding fixing cord 7. Therefore, the workability is not substantially reduced.

Therefore, according to the present invention, as a method for securely fixing them, the insulating cover 9 for preventing scattering of the winding 2 as shown in FIG.
By attaching the, it is surely fixed. The insulating cover 9 for scattering prevention is provided with a plurality of air holes 10 for the purpose of increasing the heat exchange efficiency of the compressor system and for preventing the temperature of the winding 2 from increasing during the operation of the motor. This wind hole 1
With 0, the mist-like mixed oil of the refrigerant and the refrigerating machine oil flows in the hermetic compressor, increasing the heat exchange efficiency of the compressor system and preventing the temperature of the winding 2 from rising. The shape, size, and number of the air holes 10 provided in the scattering prevention insulating cover 9 are not limited as long as they are for the above-mentioned purpose.

After connecting the winding 2 drawn out from each phase and the lead wire 5 to the scattering prevention insulating cover 9,
Since the terminal of the lead wire 5 must be connected to the herme pin of the casing, the lead wire 5 is attached to the scattering prevention insulating cover 9.
And a recessed notch groove 11 in a bag shape for pulling out and fixing. The concave notch groove 11 of FIG.
3 is shown in FIG. The notch groove 11 is a concave notch cut out from the outer diameter of the scattering prevention insulating cover 9 and closed around the center of the scattering prevention insulating cover 9 in FIGS. 1 and 3. Is a round hole wider than the notch groove width 11a.

This is because, in the case of a three-phase induction motor, there are usually three lead wires 5 of U-phase, V-phase and W-phase. The concave cut-out groove width 11a from the outer diameter of the scattering prevention insulating cover 9 to the vicinity of the center is set slightly wider than the diameter of one lead wire 5. This concave cutout groove width 11a
When the three lead wires 5 reach the concave notch groove bottom 11b, they will be formed in a bale shape and can be securely fixed. The groove-shaped notch groove width 1 from the outer diameter of the scattering prevention insulating cover 9 to the vicinity of the center of the bag-stop portion of the concave-shaped notch groove bottom portion 11b is 1
It is formed wider than 1a. In the present embodiment, the shape of the concave cut-out groove bottom 11b is not limited, and any shape such as a round hole, a square hole, a triangular hole, or the like, may be used as long as the lead wire is covered by the concave bottom 11b.

The concave cut-out groove 11 is provided with a funnel in which the outside diameter side of the scattering prevention insulating cover 9 is widened so that the lead wire 5 can be easily inserted into the outside diameter side of the scattering prevention insulating cover 9. The notch is formed in the shape of a concave notch 1
1 can be easily inserted. The arrow in the drawing indicates the situation where the lead wire 5 reaches the concave notch groove lower part 11b through the concave notch groove width 11a. Also,
The broken line indicates a state in which the lead wire 5 is settled in the concave notch bottom portion 11b.

Further, due to environmental problems and the like, conventionally, refrigerants used in air conditioners and refrigerators are CFC12, CFC22, etc., and naphthenic, paraffinic mineral oils or alkylbenzene oils are used as refrigerating machine oils. When using a refrigerant such as HFC134a, HFC410a or HFC407c and a mixed oil such as a polyalkylene glycol-based oil, polyester-based oil or ether-based oil which is a refrigerating machine oil, the material of the bobbin 8 and the scattering prevention insulating cover 9 is made of a super engineering plastic. By using (super engineering plastic), it is possible to minimize the hydrolysis of the insulator due to the amount of water contained in the refrigerating machine oil, which has conventionally been a problem. As a super engineering plastic, for example, polyethylene naphthalate (PE
N), polyethylene sulfide (PPS), liquid crystal polymer resin (LCP), fluororesin, polyetheretherketone (PEEK) and the like.

FIG. 4 shows the second embodiment of the present invention. FIG. 4 is a partial cross-sectional view of the bobbin 8a and the scattering prevention insulating cover 9 attached to the stator core 1 for explaining the present invention. A bobbin 8a is mounted on one end of the stator core 1 and a winding 2 is provided. A connection point 6 connecting the end of the winding 2 drawn from each phase and the lead wire 5 is disposed above the winding 2. In order to prevent the connection points 6 and the windings 2 from being scattered, the connection points 6 and the windings 2 are securely pressed down to the bobbin 8a side by the scattering prevention insulating cover 9. As a method for pressing down, a claw 12 which can be caught on at least one of the scattering prevention insulating cover 9 and the bobbin 8a is provided. This nail 1
Reference numeral 2 denotes a structure in which the protrusion on the bobbin 8a side and the protrusion on the side of the scattering prevention insulating cover 9 are engaged with each other to press the connection points 6 and the like from above the windings 2 of the stator core 1. As a result, scattering of the lead wire 5 and the connection point 6 and the winding 2 drawn out from each phase can be suppressed. Therefore, the winding 2, the lead wire 5, and the connection point 6 by the conventional racing machine
Is no longer necessary, and since the scattering prevention insulating cover 9 is merely hung on the bobbin 8a, it is not necessary for the operator to always check whether the winding fixing cord 7 has securely fixed.

In FIG. 4, the projections 12 are provided on both sides to secure the hooks. However, the projections 12 are provided on either the bobbin 8a or the insulating cover 9 for preventing scattering. A concave portion may be formed. If it is concave, it may be a through hole. Further, in FIG. 4, the hook 12 that can be hooked is provided on the resin wall 13 for protecting the coil on the outer diameter side, but may be provided on the resin wall 14 for protecting the coil on the inner diameter side. Also,
The claw 12 that can be hooked may be present over the entire circumference of the scattering prevention insulating cover 9 and the bobbin 8a or may be partially present.

FIGS. 5 and 6 show the third embodiment of the present invention. FIG. 5 is a plan view showing a state where the stator is completed according to the third aspect of the present invention. FIG. 6 is a plan view of the scattering prevention insulating cover 9a of the present invention used in FIG. As described above, the anti-scattering insulating cover 9 of FIG. 1 is provided with the air hole 1 for the purpose of increasing the heat exchange efficiency of the compressor system and for preventing the temperature rise of the motor winding 2 during operation of the hermetic compressor.
A plurality of 0s are provided. The air holes 10 allow the mist-like mixed oil of the refrigerant and the refrigerating machine oil to flow in the hermetic compressor, thereby increasing the heat exchange efficiency of the compressor system and preventing the temperature of the winding 2 from rising. As a method of effectively distributing the mist-like mixed oil of the refrigerant and the refrigerating machine oil in the hermetic compressor, a part of the resin wall for protecting the coil located outside the anti-scattering insulating cover 9a in FIGS. Is largely cut out, it is possible to enhance the cooling effect by the mist-like mixed oil of the refrigerant and the refrigerating machine oil.

However, the connection point 6 between the winding 2 drawn from each phase and the end of the winding 2 drawn along with the phase and the lead wire 5 may fall or jump toward the inner diameter side of the stator. In order to prevent contact with the rotor of the electric motor and cause rotation failure, windings drawn out from each phase are connected by a ring-shaped resin wall 15 for protecting coils located inside the insulating cover 9a for preventing scattering. The connection point 6 of the end 2 of the winding 2 and the lead 2 attached thereto and the lead wire 5 prevent the stator 2 from dropping or jumping out of the stator.

5 and FIG. 6, a part of the coil protecting resin wall located outside the anti-scattering insulating cover 9a is cut out largely toward the inner diameter side, and is drawn out from each phase. The outer diameter side and inner diameter of the scattering prevention insulating cover 9a so that the connection point 6 of the winding 2 and the end of the winding 2 drawn out therewith and the lead wire 5 do not protrude in the radial direction of the stator. It is covered with a resin wall to connect the sides. Thus, the strength of the scattering prevention insulating cover 9a can be increased.

Also, the strength of the scattering prevention insulating cover 9a can be increased by connecting the inside of the scattering prevention insulating cover 9a with the ring-shaped resin wall 15, so that the scattering prevention insulating cover 9a can be broken by handling. Defects such as cracks and cracks can be reduced.

FIG. 7 shows a fourth embodiment of the present invention. FIG. 7 is a partial cross-sectional view of the bobbin 8b attached to the stator core 1 and the scattering prevention insulating cover 9 for explaining the present invention. As described above, the bobbin 8a and the scattering prevention insulating cover 9 are fixed by providing the claw 12 which can be hooked on at least one of the integrally formed bobbin 8a and the scattering prevention insulating cover 9 in FIG. As shown in FIG. 7, the bobbin 8b and the insulating cover 9 for preventing scattering
Anti-scattering insulating cover 9
And a bobbin 8 integrally formed in the hole 16.
The projection 17 from the position b is fitted, and the projection 17 is deformed by ultrasonic welding or the like and fixed by welding. In FIG. 7, the welding portion 18 to be welded and fixed has been described in one place. However, the number is not limited, and a plurality of places may be provided depending on the application (see FIG. 6).

When a plurality of welding portions 18 are provided, it is preferable to provide them at equal intervals or symmetrically with respect to the center of the inner diameter of the stator. Further, since there are a plurality of welding portions 18, the first welding and fixing are not performed at all the welding portions, and only the minimum necessary portions are fixed by the use or the material strength. Even after the prevention insulating cover 9 has been welded, even if a defect occurs in the stator and repairs are required, only the first welded-in welded portion 18 is removed and necessary repairs are made. It can be fixed by welding at the welding point.

This eliminates the need to completely replace the bobbin 8b and the scattering prevention insulating cover 9. Also,
Since there is no need to replace the bobbin 8b of the stator, there is no need to perform the winding work or other connection work again from the beginning. Therefore, the time and material cost required for repair can be reduced. It is not necessary to explain that the present invention can be more firmly fixed by using the bobbin 8a of FIG. 4 and the claws 12 shown in the insulating cover 9 for preventing scattering.

The fifth aspect of the present invention will be described with reference to FIGS. The winding 2 wound around the integrally formed bobbin 8a in FIG. 4 is arranged so that the winding 2 is wound around the bobbin 8a in order to improve the occupancy of the winding 2. Further, more windings are wound on the bobbin 8a by stacking the windings 2 wound in an array. For this reason, the bale-stacked winding 2 is not distorted on the inner diameter side and the outer diameter side of the stator so that the resin wall 1
3 and 14 are provided.

The winding height of the windings 2 wound on the bobbin 8a in a bale stack can be set so that the windings 2 can be wound as long as the occupancy of the windings 2 in the slots permits. 2 is provided with a high resin wall for coil protection so as not to collapse. However, in the winding method based on concentrated winding, the trajectory of the needle of the winding machine is largely wound on the bobbin 8a or the slot beyond the resin wall 14 for protecting the coil inside the stator, so that the winding 2 is aligned as described above. It is quite difficult to wrap around. This is because the winding locus of the needle of the winding machine is large, so that the windings 2 are wound separately and the windings cannot be arranged in a line, so that the bales are broken and the number of windings that could theoretically be wound cannot be wound. .

In view of the above, the problem can be solved by using the bobbin 8b having the structure shown in FIG. That is, by making the resin wall 21 for protecting the coil inside the stator lower than the height of the resin wall 20 for protecting the coil outside the stator, the movement of the needle of the winding machine when winding the winding 2 around the bobbin 8a is reduced. Since a large locus is not drawn, the windings 2 can be wound and arranged in a line. In addition, since the windings 2 can be aligned and wound by lowering the resin wall 21 for protecting the coil inside the stator, the occupancy in the stator slots can be improved. In this case, FIG. 4 and FIG. 7 are described in comparison, but the present invention may be applied to the invention of FIG.

The invention of claim 6 uses a method shown in FIG. 8 which is different from the method of fixing the lead wire 5 in the concave cutout groove 11 described above with reference to FIGS. Will be explained. FIG. 8 shows a concave cutout groove 23 of the scattering prevention insulating cover 9b.
It is a principal part perspective view which fixed the lead wire 5 to FIG. The anti-scattering insulating cover 9b is provided with a concave cutout groove 23,
Lead wire 5 is inserted. Anti-scattering insulating cover 9b
Lead wire 5 inserted into concave notch groove 23 provided in
The opening of the concave cut-out groove 23 is covered with an outer-diameter resin wall 22 for protecting the coil, which is located on the outer diameter side of the stator of the bobbin around which the winding 2 is wound, so as not to protrude. The lead wire 5 can be securely fixed without jumping out of the scattering prevention insulating cover 9b. It is needless to mention that the lead wire 5 can be further securely fixed by using the method of fixing the lead wire 5 in the concave cutout groove 11 described above with reference to FIGS. Can be fixed.

The invention according to claim 7 will be described with reference to FIG. FIG. 9 is a partial side view seen from the inner diameter side of the stator core of FIG. 5. Bobbin 8 attached to stator core 1
Since there is no resin wall in each slot opening where the winding 2 on the inner diameter side of the stator is inserted, as described above, the connection point 6 between the end of the winding 2 and the lead wire 5 is Since there is a possibility that the resin wall may fall to the side, a resin wall in which a portion facing each slot opening is partially protruded from a ring-shaped resin wall 15 for protecting the coil located on the inner diameter of the insulating cover 9a for preventing scattering is provided. I have. It is preferable that the resin wall is provided so that the winding 2, the lead wire 5, the connection point 6, etc. are engaged with the bobbin 8 with irregularities so that the windings 2, the connection points 6, and the like do not fall into the inner diameter side of the stator, and the gap is minimized. For example, the scattering prevention insulating cover 9
A ring-shaped resin wall 1 for protecting the coil located at the inner diameter of a
The shape of the protrusion protruding from 5 may be triangular, square, round, trapezoidal or the like, as long as the shape of the bobbin protruding from the end of the stator meshes with the irregularities.

[0042]

As described above, in a hermetic compressor motor in which HFC is sealed as a refrigerant, copper loss, which is a loss of the motor, can be greatly reduced by applying a concentrated winding to the teeth of the stator. Can be given. And
Since the winding is a concentrated winding in which the winding is wound directly around the bobbin, the winding can be aligned and wound when concentrated winding is performed without disturbance of the winding. As a result, there is no need to disturb the winding and to bundle and align the connection points between the ends of the windings drawn from each phase and the lead wires, which are conventionally performed manually. Further, the winding has been conventionally shaped by a shaping press or the like in order to correct the disturbance of the winding. However, since the winding is a concentrated winding in which the winding is wound directly on the bobbin, it is not necessary to perform the shaping. In addition, since each phase is divided and wound on the stator teeth because of the concentrated winding, each phase does not have to be insulated with an interphase insulating paper or the like, and the material cost of the interphase insulation can be reduced. Also, the operation for inserting the interphase insulation can be omitted.

In the past, the connection point between the winding end drawn from each phase from the motor and the lead wire was fixed with a winding fixing string. By attaching the cover, it can be fixed securely. Thereby, the operator can easily fix the connection point portion without taking time.

Further, the scattering prevention insulating cover is provided with a plurality of air holes for the purpose of increasing the heat exchange efficiency of the compressor system and for preventing the temperature of the windings from increasing during operation of the electric motor. A mist-like mixture of oil and refrigeration oil flows in the hermetic compressor, increasing the heat exchange efficiency of the compressor system and preventing a rise in the temperature of the windings.

Further, a concave notch groove extending from the outer diameter of the scattering prevention insulating cover to the vicinity of the center is provided, and the width of the bottom of the concave notch groove extends from the outer diameter of the scattering preventing insulating cover to the vicinity of the center. The lead wire can be securely fixed by making the shape wider than the width of the notch groove up to this point.

Furthermore, since it is a motor of a hermetic compressor in which HFC is sealed as a refrigerant, hydrolysis is performed by the amount of water by using a super engineering plastic (super engineering plastic) as an insulating material used for the motor. However, the number of bobbins and the insulating cover for preventing scattering can be reduced as much as possible.

Further, the electric motor is provided with a claw that can be hooked on at least one of the integrally formed bobbin and the scattering prevention insulating cover, so that the winding, the lead wire, and the connection point portion can be surely provided. Etc. can be fixed. In addition, since the bobbin of the stator and the insulating cover for preventing scattering can be securely hung, generation of noise due to vibrations in the hermetic compressor can also be suppressed.

Further, the resin wall positioned on the inner diameter side of the scattering prevention insulating cover is connected in a ring shape, and the resin wall positioned on the outer diameter side of the scattering preventing insulating cover is largely cut out, so that the scattering preventing insulating cover is cut off. The effect more than the effect of the air hole provided in the cover can be obtained.

Also, after a projection from which a part of the integrally formed bobbin protrudes is fitted into a hole provided in the scattering prevention insulating cover, the projection is welded and fixed by ultrasonic welding to scatter with the bobbin. By integrally fixing the insulating cover for prevention, the bobbin and the insulating cover for scattering prevention can be firmly fixed.

In the integrally formed bobbin, the height of the coil protecting resin wall located on the stator inner diameter side is made lower than the height of the coil protecting resin wall located on the stator outer diameter side. Since the movement of the needle of the winding machine does not draw a large trajectory, the windings can be wound and arranged in a line. Further, since the windings can be aligned and wound, the occupancy in the stator slots can be improved.

Further, as a fixing method for fixing the lead wire to the scattering prevention insulating cover, a concave notch groove is provided from the outer diameter side of the scattering preventing insulating cover, and the notch groove is formed in the concave notch groove. After fixing the lead wire, the lead wire can be fixed more reliably by covering with a resin wall for coil protection located on the outer diameter side of the stator of the integrally formed bobbin. The same effect can be obtained by providing a concave notch groove from the inner diameter side of the scattering prevention insulating cover and covering with a resin wall for coil protection located on the inner diameter side of the stator of the integrally formed bobbin. can get.

The resin wall located on the inner diameter side of the scattering prevention insulating cover is connected in a ring shape, and the resin wall located on the inner diameter side of the scattering preventing insulating cover is opposed to each slot opening of the stator core. By protruding the part and making the resin wall located on the inner diameter of the scattering prevention insulating cover and the bobbin mesh with irregularities, gaps can be eliminated as much as possible, and windings, lead wires and connection points etc. You can avoid falling down to the side.

[0053]

[Brief description of the drawings]

FIG. 1 is a plan view of a stator showing an embodiment of the present invention.

FIG. 2 is a plan view of the stator before attaching the scattering prevention insulating cover of FIG. 1;

FIG. 3 is an enlarged view of the concave cutout groove of FIG. 1;

FIG. 4 is a partial sectional view of a bobbin 8a attached to a stator and an insulating cover 9 for preventing scattering.

FIG. 5 is a plan view of a stator showing an embodiment of the present invention.

FIG. 6 is a plan view of a scattering prevention insulating cover according to the embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of a bobbin 8b and a scattering prevention insulating cover 9 attached to a stator.

FIG. 8 is a perspective view of a main part showing a method of fixing a lead wire according to the embodiment of the present invention.

FIG. 9 is a partial side view as viewed from the inner diameter side of the stator core of FIG. 5;

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator core, 2 ... Winding, 3 ... Phase insulation, 4 ... Slot insulation, 5 ... Lead wire, 6 ... Connection point, 7 ... Winding fixing string,
8, 8a, 8b: bobbin, 9, 9a, 9b: anti-scattering insulating cover, 10: wind hole, 11, 23: concave cutout groove, 11a: concave cutout groove width, 11b: concave shape Notch groove bottom, 12 ... claws, 13, 20, 22 ... outer diameter side resin wall, 14, 21 ... inner diameter resin wall, 15 ... ring-shaped resin wall, 16 ... hole, 17 ... protrusion, 18 ... welding part , 19 ... Stator core hole.

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[Procedure amendment]

[Submission date] September 29, 2000 (2009.2)
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

Further, due to environmental problems and the like, conventionally, refrigerants used in air conditioners and refrigerators are CFC12, CFC22, etc., and naphthenic, paraffinic mineral oils or alkylbenzene oils are used as refrigerating machine oils. When using a refrigerant such as HFC134a, HFC410a or HFC407c and a mixed oil such as a polyalkylene glycol-based oil, polyester-based oil or ether-based oil which is a refrigerating machine oil, the material of the bobbin 8 and the scattering prevention insulating cover 9 is made of a super engineering plastic. By using (super engineering plastic), it is possible to minimize the hydrolysis of the insulator due to the amount of water contained in the refrigerating machine oil, which has conventionally been a problem. As a super engineering plastic, for example, polyethylene naphthalate (PE
N), polyphenylene sulfide (PPS), liquid crystal polymer resin (LCP), there is a fluororesin, polyether ether ketone (PEEK) and the like.

Continued on the front page (72) Inventor Tetsuharu Hattori 2nd Aichi-cho, Kasugai-shi, Aichi Aichie-Mason Electric Co., Ltd. F-term (reference) 5H603 AA03 AA16 AA18 AA19 BB01 CA01 CA05 CB04 CB12 CB18 CB20 CB24 CC04 CC11 CC17 CD01 CE13 EE02 EE13 FA16 FA27 5H604 AA05 AA08 CC01 CC05 CC16 DA13 DA14 DA24 DB01 PB04 PC01 PE03 QA01 QA08 QB01 QB16 QB17

Claims (7)

[Claims] An HFC is sealed as a refrigerant of a hermetic compressor, a slot of a stator core of an electric motor is provided with a bobbin integrally formed, and teeth of the stator core are concentratedly wound through the bobbin through the bobbin. The anti-scattering insulating cover is provided to prevent scattering of windings, lead wires, connection points, and the like by the concentrated winding, and the anti-scattering insulating cover includes a mist of the refrigerant and the refrigerating machine oil. Has a fixing method for fixing the vent hole and the lead wire through which the mixed oil flows,
The material of the bobbin and the insulating cover for preventing scattering is super engineering plastic (super engineering plastic).
A stator for an electric motor, characterized in that: 2. The stator for an electric motor according to claim 1, wherein a claw that can be hooked on at least one of the integrally formed bobbin and the scattering prevention insulating cover is provided. 3. A resin wall located on the inner diameter side of the scattering prevention insulating cover is connected in a ring shape, and the resin wall located on the outer diameter side of the scattering preventing insulating cover is largely cut away. A motor stator according to claim 1 or claim 2. 4. A part of the integrally formed bobbin has a protruding projection, and after being fitted into a hole provided in the scattering prevention insulating cover, the projection is welded and deformed to form the integrally molded bobbin. The stator according to any one of claims 1 to 3, wherein the formed bobbin and the scattering prevention insulating cover are integrally fixed. 5. The height of a coil protecting resin wall located on a stator inner diameter side is lower than a coil protecting resin wall located on a stator outer diameter side in the integrally formed bobbin. The stator for an electric motor according to any one of claims 1 to 4, wherein: 6. As a fixing method for fixing a lead wire to the scattering prevention insulating cover, a concave notch groove is provided from an outer diameter side of the scattering preventing insulating cover, and the concave notch is provided. 6. The fixing device according to claim 1, wherein after the lead wire is fixed in the groove, the bobbin formed integrally with the bobbin is covered with a coil protecting resin wall located on the outer diameter side of the stator.
The stator of the electric motor according to any one of the above. 7. A resin wall located on the inner diameter side of the scattering prevention insulating cover is connected in a ring shape, and the resin wall located on the inner diameter side of the scattering preventing insulating cover faces each slot opening of the stator core. The electric motor according to any one of claims 1 to 6, wherein the formed portion is protruded so that the ring-shaped resin wall located on the inner diameter side of the scattering prevention insulating cover and the bobbin mesh with irregularities. Stator.