JP2002142390A - Motor and compressor using the same - Google Patents

Abstract

(57) [Summary] (Modifications) [PROBLEMS] To reduce electromagnetic noise near a carrier frequency in PWM driving in a concentrated winding motor used for a compressor of an air conditioner or a refrigerator. SOLUTION: A stator 10 having a stator core 11 formed by laminating stator core sheets and having an annular yoke and a plurality of teeth 14 is wound directly on the teeth 14 of the stator core 11 with an insulator interposed therebetween. In a motor having a rotor rotatably supported to face each other, a slit 17 is provided from one end near the boundary between the teeth 14 and the slot to near the boundary at the other end in the width direction of the teeth 14. And

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a stator core structure of a concentrated winding motor.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG.

As shown in FIG. 7, a conventional concentrated winding motor used for a compressor of an air conditioner or a refrigerator is composed of a stator 60 and a rotor 80. The stator 60 is provided with six teeth provided on a stator core 61. 62, three-phase windings 63U, 63V, 63W are applied directly via an insulator (insulating film, insulator, etc .: not shown). The stator core 61 is provided with a tooth body 64 on which a winding is applied.
A tooth tip 65 facing the outer periphery of the rotor and disposed generally wider than the teeth body 64 at the tip of the teeth body 64, and a substantially annular yoke 66 connecting the outer periphery of the teeth body 64 Consists of

The rotor 80 has a permanent magnet 82 embedded inside a rotor core 81, end plates (not shown) disposed at both ends in the axial direction, and rivets (not shown) formed in through holes 83 provided in the rotor core 81.ず) and fixed by swaging. The rotor 80 is rotated about a shaft by a rotating magnetic field caused by a current flowing through a winding applied to the stator core 61.

The windings are of three phases of U, V, and W phases, are star-connected to each other, and are 120 ° rectangular wave energization in which two of the three phases are energized and driven at the same time. Further, the applied voltage is changed by the PWM control.

The outer periphery of the stator core 61 has a substantially semicircular notch 67. This means that when the stator 60 is shrink-fitted and pressed into a compressor shell (not shown), a through hole is provided between the compressor shell and the stator core 61, and serves as a refrigerant passage.

[0007]

When a current is flowing from the U-phase to the V-phase, the teeth of the stator having the U-phase winding have the N-pole (or S-pole) and the V-phase winding. The teeth are S poles (or N poles). The W phase has no polarity. At this time, since the magnetic flux flows from the N pole to the S pole, the teeth provided with the U-phase winding and the teeth provided with the V-phase winding attract each other at the tip. At this time, stress is applied to the teeth in a direction in which the teeth provided with the U-phase winding and the teeth provided with the V-phase winding attract each other, and the force is transmitted to the yoke of the stator, and the yoke is mainly vibrated.
Since this force rotates by inputting current with square wave drive,
It is excited more than sine wave drive. Concentrated winding is more likely to generate annular vibration (elliptical vibration) of the stator yoke than distributed winding. Sound may increase.

Further, since the above-described compressor using the conventional motor is wrapped in a shell, sound and vibration are easily transmitted to the shell. In addition, in the case of a hermetic compressor, noise is further increased because the vibration-proof material cannot be used freely.

The present invention provides a motor capable of reducing electromagnetic noise generated by annular vibration (elliptical vibration) of a stator yoke without impairing motor characteristics, and an efficiency with reduced electromagnetic noise. To provide a good compressor.

[0010]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention is to provide a slit in a stator tooth body in a direction perpendicular to a radial direction on a plane so that a stator yoke portion is formed from a tooth tip portion. Give spring to the direction,
Vibration transmission is absorbed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION
A stator in which a stator core sheet is laminated, the stator of the stator core composed of an annular yoke and a plurality of teeth, a stator in which the teeth are directly wound via an insulator, and rotatably supported so as to face the teeth. Wherein the slit is provided from one end near the boundary between the tooth and the slot to near the boundary at the other end in the width direction of the tooth, and the stator yoke portion extends from the tooth tip to the stator yoke portion. Has the function of being able to absorb the transmission of vibrations.

According to a second aspect of the present invention, there is provided the motor according to the first aspect, wherein the slit is provided at the narrowest portion of the teeth portion, and has an effect of not impairing the characteristics of the motor.

According to a third aspect of the present invention, in the motor according to the first aspect, the slit is formed in a straight line orthogonal to a straight line connecting the center (width direction) of the teeth portion and the center of rotation of the rotor. Has the effect of not impairing the characteristics of

According to a fourth aspect of the present invention, there is provided the motor according to the third aspect, wherein the slit is line-symmetric with respect to a straight line connecting the center (width direction) of the teeth portion and the center of rotation of the rotor. The tooth body and the yoke can be connected and held with sufficient strength.

According to a fifth aspect of the present invention, the width of the thin portion of the stator core formed at both ends of the slit is equal to or greater than the thickness of the stator core sheet forming the stator core. Any one of item 4
The motor has the function of connecting and holding the teeth body and the yoke with sufficient strength.

The invention according to claim 6 is the motor according to any one of claims 1 to 5, wherein the width of the slit provided in the teeth portion (the radial direction of the stator core is smaller than the air gap dimension). This has the effect of minimizing the obstruction of the magnetic flux flow.

According to a seventh aspect of the present invention, both ends of the slit in the longitudinal direction extend along the thickness direction of the teeth so as to form an H-shape or a U-shape. The length of the thin part between both ends in the direction is
The motor according to any one of claims 1 to 3, wherein the motor has a larger width than the slit width, and has an effect that a spring constant can be reduced.

According to an eighth aspect of the present invention, there is provided the motor according to any one of the first to seventh aspects, wherein the inside of the slit is filled with rubber, and has an effect that transmission of electromagnetic vibration can be attenuated. Have.

According to a ninth aspect of the present invention, there is provided the motor according to any one of the first to seventh aspects, wherein a rubber containing a magnetic material is filled in the slit. And the hindrance of the magnetic flux flow can be minimized.

According to a tenth aspect of the present invention, there is provided the motor according to any one of the first to seventh aspects, wherein the inside of the slit is filled with a flexible plastic, and the transmission of the electromagnetic vibration is attenuated. Has the effect of being able to.

According to an eleventh aspect of the present invention, there is provided the motor according to any one of the first to seventh aspects, wherein the slit contains a magnetic material and is filled with a flexible plastic. This has the effect that transmission can be attenuated and hindrance to magnetic flux flow can be minimized.

According to a twelfth aspect of the present invention, when the stator core is divided into an outer core mainly composed of a yoke portion and an inner core mainly composed of a teeth portion, the stator core is combined with the inner core. The motor according to any one of claims 1 to 11, wherein a slit is formed at a joint between the outer core and the inner core, and has an effect that a slit having a small width can be easily obtained.

According to a thirteenth aspect of the present invention, there is provided the motor according to the twelfth aspect, wherein the inner core and the outer core are joined to each other by means for fixing the core sheets between the core sheets by means of karamase, laser welding, or riveting. And has an effect that a laminated core can be easily obtained.

According to a fourteenth aspect of the present invention, there is provided the motor according to the twelfth aspect, wherein adjacent inner ends of the teeth are connected to the inner periphery of the teeth. It has the effect that the outer core can be assembled.

According to a fifteenth aspect of the present invention, in the motor according to the fourteenth aspect, the tips of adjacent teeth are connected by resin on the inner peripheral side of the teeth. It has the effect that it can be performed.

The invention according to claim 16 is the motor according to claim 15, wherein the insulation between the inner core and the winding is formed by a resin mold, and each tooth is fixed and positioned by the resin mold. Can be simplified and the inner core inner diameter accuracy can be easily secured.

The invention according to claim 17 is characterized in that the teeth of the stator core have slits in the teeth.
A compressor incorporating the motor according to any one of the above, which has an effect of providing an efficient compressor with reduced electromagnetic noise.

[0028]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG.

FIG. 1 is a sectional view of a motor according to a first slit embodiment of the present invention.

FIG. 2 is a sectional view of a compressor incorporating the motor of the present invention.

FIG. 3 is a sectional view of a motor according to a second slit embodiment of the present invention.

A concentrated winding motor used for a compressor of an air conditioner or a refrigerator includes a stator 10 and a rotor 80,
The stator 10 has three-phase windings 13U, 13V, which are directly connected to six teeth 12 provided on a stator core 11 via an insulator (insulating film, insulator, etc., not shown).
13W.

The stator core 11 has a toothed portion 14 on which a winding is applied, and faces the outer periphery of the rotor.
At the tip of the tooth 4, a tooth tip 15 which is usually arranged widely
And a substantially annular yoke portion 16 connecting the teeth portions 14 to each other.

The rotor 80 is the same as a conventional motor, and a description thereof will be omitted.

The teeth 14 of the stator core 11
A long slit 17 is provided in a direction orthogonal to the radial direction. Since the teeth portion 14 has a spring property in a radial direction (hereinafter, referred to as a vertical direction of the teeth), transmission of electromagnetic vibration generated at the inner diameter portion of the stator to the yoke portion 16 of the stator 10 during motor operation is reduced. There is a thin portion 18 between both ends in the width direction of the teeth 12 and both ends in the longitudinal direction of the slit 17. The smaller the width SW of the thin portion 18 is, the more the vibration isolating performance is improved.

The shape of the slit 17 is the shape of the teeth 14
A straight line that is long in the direction orthogonal to the line connecting the yoke portion 16 and the tooth tip portion 15, that is, the width direction of the tooth portion 14, is SH.

In order to connect and hold the teeth portion 14 and the yoke portion 16 with sufficient strength, the width of the thin portion of the stator core between the both ends in the width direction of the teeth portion 14 and the both ends in the longitudinal direction of the slit 17 is set. Is at least equal to or greater than the thickness dimension of the stator core sheet forming the stator core 11.

On the other hand, the slits 17 are arranged over substantially the entire width of the teeth and hinder the flow of the magnetic flux passing through the teeth body 14, so that the smaller the width SL of the slits 17, the better. Usually less than or equal to air gap,
Desirably, when it is less than half of the air gap, the influence on the characteristics is small.

When the slit 17 is filled with an elastic substance such as plastic or rubber having flexibility,
This is effective in increasing the radial strength. Also, if a plastic containing a magnetic material (especially a ferromagnetic material) such as iron powder is used, the magnetic flux can easily pass through and the deterioration of the characteristics can be suppressed.

As shown in FIG. 2, when the motor having the above structure is used in a hermetic compressor used in an air conditioner or a refrigerator in which the vibration-proof material cannot be used freely, the vibration-proof material can be eliminated. Is preferred. In particular, like a scroll type compressor, the outer periphery of the stator core is
In the case of shrink fitting, the vibration of the stator core 11 is transmitted to the vibration of the shell 20 as it is, which is particularly effective.

As shown in FIG. 3, if both ends of the slit 27 in the longitudinal direction extend along the longitudinal direction of the teeth portion 14 so as to form an H-shape (or a U-shape), Without increasing the width of the slit 17 obstructing the magnetic path, the length SE of the thin portion of the stator core 11 between both ends in the width direction of the teeth portion 14 and both ends in the longitudinal direction of the slit 17 becomes larger than the slit width. The length of the thin portion can be increased, and in particular, the force acting in the rotational direction of the tooth tip 15 can be damped. When the thin portion is configured as a beam, the natural frequency of the beam is usually inversely proportional to the length of the beam. Accordingly, by increasing the length SE of the thin portion, the natural frequency can be lowered, and as a result, the frequency at which vibration can be prevented can be lowered. In particular, in the case of a motor having concentrated windings, the vibration mode that resonates in the vicinity of the carrier frequency in the PWM control is an elliptical vibration mode that occurs when the adjacent tooth portions 14 attract each other at the opposite poles. This configuration that absorbs the vibration in the rotational direction of the tooth tip 15 is particularly effective.

The shape of the rotor and the shape of the stator and the number of poles of the motor are arbitrary. Further, the compressor is not limited to the case where the outer periphery of the stator core is shrink-fitted to the shell, but may be bolted or the like.

In order to reduce the annular vibration (elliptical vibration) of the stator yoke, which is a conventional problem, the teeth 14
Is a motor of the stator 10 provided with a slit 17 having a length close to the width of the teeth portion 14 in a direction orthogonal to a radial direction (denoted as a vertical direction of the teeth). Because it has a spring property in the vertical direction,
Vibration of the stator 10 generated when the rotor 80 rotates is suppressed.

Further, the slit 17 is connected to the teeth portion 14.
The slit 17 can be made the shortest, and the transmission of electromagnetic vibration is reduced.

(Embodiment 2) Hereinafter, a second embodiment using a fitting stator will be described with reference to FIGS. 4, 5, and 6. FIG.

FIG. 4 shows a second embodiment of the fitting stator according to the present invention.
It is sectional drawing of the motor in the Example of FIG.

FIG. 5 is a sectional view of the outer core in the embodiment of the fitting stator according to the present invention.

FIG. 6 is a sectional view of the inner core in the embodiment of the fitting stator according to the present invention.

The stator core is divided into an outer core 31u mainly including a yoke portion and an inner core 31v mainly including the teeth portion 32. When the outer core 31u and the inner core 31v are combined, the outer core 31u A motor having a stator configuration characterized in that a slit portion 37 is formed at a joint portion of the inner core 31v. Since the teeth portion 32 has a spring property in the vertical direction of the teeth, transmission of electromagnetic vibration generated at the time of rotation of the rotor is prevented. The teeth 32 and the yoke 36 can be connected and held with sufficient strength.

The inner core 31v and the outer core 31u are formed by laminating punched electromagnetic steel sheets (core sheets). Laser welding 41 (necessary for each tooth as a joining means between the core sheets, Omitted.)
In addition, as a joining means, a method using karamase or rivet caulking may be used. When the laser welding 41 is used, an increase in iron loss due to the Kalamase structure can be prevented. Laser welding 41 is performed in the form of a spot between laminated electromagnetic steel sheets,
Further, if the adjacent laser welds 41 are formed in a staggered manner so as not to overlap with each other, the short circuit of the correlated insulation of each magnetic steel sheet can be minimized, and the iron loss can be further reduced. In addition, in the case of using the Kalamase structure, an extra step for joining is not required, and the inner diameter accuracy at the time of lamination can be ensured.

The inner core 31v is adjacent to the teeth 3
The inner diameter side of the two distal ends is partially connected in the stacking direction by a bridge 31b. As a result, the inner core 31v can be handled as one part, so that the process is simplified and the productivity is improved. However, the width of the bridge 31b may be reduced as much as possible to leak magnetic flux between adjacent teeth, and the bridge 31b may be cut while leaving a part in the stacking direction.

Further, in order to ensure the accuracy of the inner diameter of the inner core 31v, it is preferable to fix the inner diameter of the inner core 31v with resin or the like. At this time, a mold 42 (omitted in FIG. 4) for insulation between the inside of the slot of the inner core 31v and both ends of the teeth portion 32 in the axial direction and the winding, and the inner core 3
If the fixing of the inner diameter portion of 1v is performed at the same time, the process is simplified.

After the in-slot insulation of the inner core 31v is performed, the teeth 32 are wound. Then the outer core 31
u is fitted to the inner core 31v. Note that the winding may not be directly applied to the teeth portion 32, but may be applied to the winding portion in advance and then inserted into the teeth portion 32 together with the winding frame. According to the above configuration, the winding is facilitated, so that the productivity is improved and the space factor is also improved.

In the case of the first embodiment, if the slit width is made too narrow, the cutting tool of the punching die at the slit portion becomes thin, so that the strength cannot be maintained, and there is a limit in reducing the slit width. Since the inner core 31v and the outer core 31u are separated from each other, they are separately punched, so that an extremely small slit width that does not affect the characteristics can be realized. In this case, the slit width may be small enough to prevent contact even if the dimensions vary due to the punching accuracy. That is,
The slit width is 0.2 mm to 0.3 in the case of the first embodiment.
mm or more, but in this embodiment, 0.1 m
m or less is possible.

On the other hand, in the second embodiment of the fitting stator configuration, the inner core 31v and the outer core 31u are provided with a means for fixing the respective core sheets, such as karamase, laser welding, and rivet caulking, to each other. Good.
As a result, since the teeth 32 have a spring property in the longitudinal direction of the teeth, transmission of electromagnetic vibration generated during operation of the rotor is reduced, and the teeth 32 and the yoke 36 are connected and held with sufficient strength. be able to.

The resin to be filled into the slits provided in the motors of the first and second embodiments is a plastic resin (PET, PBT, PPS, fluororesin, LC resin).
P, PEN and nylon etc.) and curable resin (unsaturated polyester and epoxy type etc.)
It is preferable to use silicone rubber, fluorine rubber, and thermoplastic elastomer (olefin-based and ester-based).

[0057]

As described above, according to the first aspect of the present invention, the provision of the slit has an advantageous effect that the transmission of vibration can be absorbed.

According to the second aspect of the invention, an advantageous effect that the characteristics of the motor are not impaired can be obtained.

According to the third aspect of the present invention, there is obtained an advantageous effect that the characteristics of the motor are not impaired.

According to the fourth aspect of the invention, an advantageous effect is obtained in that the teeth body and the yoke can be connected and held with sufficient strength.

According to the fifth aspect of the present invention, the advantageous effect that the teeth body and the yoke can be connected and held with sufficient strength can be obtained.

According to the sixth aspect of the present invention, the advantageous effect that the interruption of the magnetic flux flow can be minimized can be obtained.

The seventh aspect of the invention has an advantageous effect that the spring constant can be reduced.

According to the eighth aspect of the invention, an advantageous effect that transmission of electromagnetic vibration can be attenuated is obtained.

According to the ninth aspect of the present invention, there is obtained an advantageous effect that transmission of electromagnetic vibration can be attenuated and hindrance of magnetic flux flow can be minimized.

According to the tenth aspect, an advantageous effect that transmission of electromagnetic vibration can be attenuated can be obtained.

According to the eleventh aspect of the present invention, it is possible to obtain an advantageous effect that transmission of electromagnetic vibration can be attenuated and disturbance of magnetic flux can be minimized.

According to the twelfth aspect, an advantageous effect that a slit having a small width can be easily obtained is obtained.

According to the thirteenth aspect, an advantageous effect that a laminated core can be easily obtained is obtained.

According to the fourteenth aspect, an advantageous effect is obtained that the inner core and the outer core can be easily assembled.

According to the fifteenth aspect, an advantageous effect that the inner core can be easily connected can be obtained.

According to the sixteenth aspect of the present invention, it is possible to simplify the manufacturing process, and it is possible to obtain an advantageous effect that the accuracy of the inner core inner diameter can be easily secured.

According to the seventeenth aspect of the present invention, an advantageous effect that an efficient compressor with reduced electromagnetic noise can be provided without using a vibration-proof material is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a motor incorporating the present invention in a compressor.

FIG. 3 is a cross-sectional view of a motor in which a slit of a stator is deformed according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of a motor according to a second embodiment using the fitted stator of the present invention.

FIG. 5 is a sectional view of an outer core in the embodiment of the fitting stator according to the present invention.

FIG. 6 is a sectional view of the inner core in the embodiment of the fitting stator according to the present invention.

FIG. 7 is a sectional view of a motor according to an embodiment of the prior art.

[Explanation of symbols]

 14 Teeth part 15 Teeth tip part 16 Yoke part 17 Slit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruhiko Kado 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Kenji Sasaki 1006 Odaka Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Nosunari Asano 1006 Kazuma Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (Reference) JK05

Claims (17)

[Claims] 1. A stator having a stator core sheet formed by laminating stator core sheets and having an annular yoke and a plurality of teeth, wherein the teeth of the stator core are directly wound via an insulator so as to face the teeth. A motor having a rotor rotatably supported, wherein a slit is provided from one end near a boundary between the tooth and the slot to a vicinity of a boundary on the other end in the width direction of the tooth. 2. The motor according to claim 1, wherein the slit is provided at a narrowest portion of the teeth portion. 3. The motor according to claim 1, wherein the slit has a linear shape orthogonal to a straight line connecting the center (width direction) of the teeth portion and the center of rotation of the rotor. 4. The motor according to claim 3, wherein the slit is symmetric with respect to a straight line connecting the center of the teeth portion (width direction) and the center of rotation of the rotor. 5. The stator core according to claim 1, wherein a width of the thin portion of the stator core formed at both ends of the slit is equal to or greater than a thickness of a stator core sheet forming the stator core. Motor according to item. 6. The motor according to claim 1, wherein a width of the slit provided in the teeth portion (a radial direction of the stator core is smaller than an air gap dimension). 7. Both ends in the longitudinal direction of the slit extend so as to form an H-shape or a U-shape along the thickness direction of the teeth portion, and are provided between the both ends of the teeth and both ends in the longitudinal direction of the slit. The motor according to any one of claims 1 to 3, wherein the length of the thin portion is larger than the slit width. 8. The method according to claim 1, wherein the inside of the slit is filled with rubber.
The motor according to any one of claims 1 to 7. 9. The motor according to claim 1, wherein the inside of the slit is filled with a rubber containing a magnetic material. 10. The motor according to claim 1, wherein a flexible plastic is filled inside the slit. 11. The motor according to claim 1, wherein the slit contains a magnetic material and is filled with a flexible plastic. 12. The stator core is divided into an outer core mainly including a yoke portion and an inner core mainly including a teeth portion. When these outer cores and the inner core are combined, the outer core and the inner core are separated from each other. The motor according to any one of claims 1 to 11, wherein a slit is formed at a joint of the core. 13. The motor according to claim 12, wherein the inner core and the outer core are joined together by means for fixing the core sheets between the core sheets by means of karamase, laser welding, or rivet caulking. 14. The motor according to claim 12, wherein, in the inner core, adjacent tooth tips are connected on the tooth inner peripheral side. 15. The motor according to claim 14, wherein adjacent tooth tips are connected by resin on the inner peripheral side of the teeth. 16. The motor according to claim 15, wherein insulation between the inner core and the winding is formed by a resin mold, and each tooth is fixed and positioned by the resin mold. 17. A compressor incorporating the motor according to any one of claims 1 to 16, wherein the stator has a slit in a tooth portion of the stator core.