JP2006136164A - Stacked core, and rotor and electric motor using stacked core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stacked core which makes the easy arrangement or the like of fitting/fixing portions of uneven portions formed by embossing to integrally and mutually stack and fix electromagnetic steel sheets of thin iron plates, and the arrangement or the like of through holes for cooling the stacked core, and is proper in the performance of an electric motor without losing magnetic balance in the motor which is made compact in size and light in weight. <P>SOLUTION: In the stacked core, wherein a plurality of the thin iron plates punched by a punching press or the like are laminated, the uneven portions are formed on the adjoining thin iron plates, and the fitting/fixing portions in which the portions are fitted and fixed to one another are formed, and then these are integrally caulked to form the stacked core. The fitting/fixing portions of the uneven portions are formed to be the uneven forms of which perimeters are longer than the throughholes at least to one of a plurality of the throughholes penetrating in the laminating direction of the stacked core, then the thin iron plates are fitted and fixed to each other, and these are integrally caulked. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a laminated core of a miniaturized electric motor.

  In recent years, electric motors have been reduced in size and used in a wide range. For example, there are a compressor driving electric motor for a refrigerator or an air conditioner, an electric motor used for a vehicle application such as an electric vehicle, and the like. The former is reduced in size and weight because of the space on which the compressor is mounted. Further, the latter is similarly reduced in size and weight from the vehicle mounting space. In such an electric motor, a laminated iron core obtained by punching and laminating electromagnetic steel sheets of a thin steel plate by a press or the like is often used, and the size and weight are reduced to the minimum necessary.

  For example, in a laminated core of an electric motor as shown in Patent Document 1 (Japanese Patent Laid-Open No. 2001-292541), the diameter of the locking portion of the uneven portion is set to 0.8 mm or less so as not to adversely affect the magnetic balance. A stator or rotor using an associated laminated core is shown. Further, as shown in FIGS. 7 and 8, the diameter of the laminated core of the stator 15 or the rotor 30 is made smaller and lighter and has a minimum necessary size. For this reason, the ratio of the space required in order to arrange the locking portions 19a, 20 of the uneven portions between the electromagnetic steel plates of the thin steel plate on the end surface of the laminated core is considerably large.

  In addition, while the motor is reduced in size and weight, a high load and high performance are required, so the temperature rise in the laminated iron core of the motor is considerably worse than that of a conventional motor. Therefore, as shown in FIG. 7, in order to reduce the temperature rise of the laminated core of the electric motor, a cooling through hole 5c is provided in the laminated core to enhance the cooling effect. Thereby, the temperature rise of the laminated iron core of the electric motor is reduced.

  Further, as shown in FIG. 8, a shaft hole 31 into which the rotating shaft is inserted, a plurality of permanent magnet housing holes 32 into which the permanent magnets 33 are inserted, and the end of the laminated core and the laminated core in the stacking direction. In a rotor 30 provided with a plurality of caulking pin insertion holes 5d for integrally connecting an end plate (not shown) arranged to prevent the permanent magnet 33 from jumping out of the portion with caulking pins. However, in the same way as described with reference to FIG. 7, the electric motor is reduced in size and weight, but high load and high performance are required. Note that gaps 34 for preventing magnetic flux short-circuiting are also provided at both ends of the permanent magnet 33 of the rotor 30 shown in FIG.

JP 2001-292541 A

  In this way, in the laminated core of the motor that requires high load and high performance while being reduced in size and weight, the engagement of the concavo-convex parts by embossing for integrally laminating and fixing the electromagnetic steel sheets of thin steel plates together The portions 19a, 20 and the cooling through-hole 5c for reducing the temperature rise of the laminated core are provided on the end surfaces of the laminated cores of the stator 15 having a small diameter, such as the yoke portion 18 and the teeth portion 17 of the laminated core. Must be placed. Moreover, if it arrange | positions forcibly, the magnetic balance of a laminated iron core will worsen, and an electric motor characteristic will be worsened. Further, as shown in Patent Document 1, when the diameter of the engaging portion of the uneven portion is reduced, the pin forming the engaging portion of the uneven portion provided in the punching press or the like is easily broken, and the electromagnetic steel plate of the thin steel plate is punched out. The punching speed etc. must be slowed.

  Further, the shaft hole 31 into which the rotation shaft is inserted at the center of the laminated core, the permanent magnet receiving hole 32 for embedding the permanent magnet 33, and the permanent magnet 33 from the end of the laminated core and the laminated core to the outside in the stacking direction. A caulking pin insertion hole 5d for integrally connecting the end plate to prevent it from jumping with a caulking pin, and an uneven portion engaging portion 19b by embossing for integrally laminating and fixing the electromagnetic steel plates of the thin steel plate together, Depending on the structure of the rotor 30, when providing a cooling air hole or the like for reducing the temperature rise of the laminated core, it is considerably difficult to configure the end face of the rotor 30 with a small diameter. In particular, this problem is significant in the rotor 30 in which the permanent magnet insertion hole 32 into which the permanent magnet 33 is inserted is increased due to the increased use of the permanent magnet 33 due to the high load and high performance of the motor.

  In the present invention, the embossed concave and convex anchoring portions 19a, 19b, and 20 for laminating and fixing electromagnetic steel sheets of thin steel plates in such a laminated iron core, arrangement of through holes 5c for cooling the laminated iron core, etc. An object of the present invention is to provide a laminated iron core having good motor performance without breaking the magnetic balance even in an electric motor that is made smaller and lighter.

In a laminated core in which a plurality of thin steel plates punched by a punching press or the like are laminated, the laminated iron core is a laminated iron core that is caulked integrally by providing an engaging portion that can be engaged with each other by providing uneven portions on the adjacent thin steel plates. ,
The locking portion of the concavo-convex portion is provided with a concave portion having a circumferential length slightly larger than the through hole in at least one of the plurality of through holes penetrating in the stacking direction of the laminated iron cores, and an electromagnetic steel plate of adjacent thin steel plates A laminated core in which electromagnetic steel sheets of thin steel plates are caulked together is engaged with a convex portion having a circumferential length slightly larger than a through hole provided in the steel plate.

In addition, in the laminated iron core in which a plurality of thin steel plates punched by a punching press or the like are laminated, the laminated iron core is provided with an uneven portion on the adjacent thin steel plate and provided with a locking portion that can be locked together so that the rotor is integrally caulked. Laminated iron core
At the center of the laminated core, a shaft hole into which a rotating shaft is inserted, a plurality of permanent magnet receiving holes into which permanent magnets are inserted, and a permanent magnet protrudes from the stacking direction end of the laminated core and the laminated core. A plurality of caulking pin insertion holes for integrally caulking and joining the end plates to prevent the caulking, and an air hole for cooling the rotor depending on the structure of the rotor In the permanent magnet embedded rotor,
The locking portion of the concavo-convex portion is a recess having a circumferential length slightly larger than the caulking pin insertion hole or the air hole in at least one of a plurality of caulking pin insertion holes or air holes or the like penetrating in the stacking direction of the laminated core. And a laminated iron core that caulks together the electromagnetic steel sheets of the thin steel plates integrally with the caulking pin insertion holes or the circumferentially convex portions slightly larger than the air holes provided in the electromagnetic steel plates of the adjacent thin steel plates. To do.

  By using such a laminated iron core for an electric motor mounted in a compressor of an outdoor unit such as a refrigerator or an air conditioner, or an electric motor for a vehicle, the magnetic balance is improved and the electric motor does not deteriorate. Can do.

  At least one of a locking portion of the uneven portion by embossing for integrally laminating and fixing the electromagnetic steel plates of the thin steel plate and a plurality of cooling through holes provided for reducing the temperature rise of the laminated core Since it arrange | positions in the same position, it can determine only considering the arrangement | positioning of any one of the retaining part of the uneven | corrugated | grooved part by embossing, or a through-hole. Therefore, the magnetic adverse effect of the laminated core due to the provision of a locking portion, a through-hole or the like of the uneven portion on the end face of the laminated core where the yoke part or the teeth part is considerably narrowed is reduced as much as possible, and the motor performance is not deteriorated. It can be a laminated core. In addition, since the diameter of the pin forming the locking portion of the uneven portion provided in the punching press or the like can be increased, the pin is difficult to break, the punching speed etc. can be increased, and the laminated iron core with good mass productivity and can do.

In addition, the shaft hole for inserting the rotating shaft at the center of the laminated core, the plurality of permanent magnet receiving holes for inserting the permanent magnets, and the permanent magnets so as not to jump out of the laminated core and the laminated core end in the stacking direction. Rotating embedded permanent magnet with a plurality of caulking pin insertion holes for integrally connecting the end plate to the end plate with caulking pins and, depending on the structure of the rotor, with air holes for cooling the rotor Similarly, in the laminated core of the child,
By setting at least one of a plurality of caulking pin insertion holes or air holes penetrating in the stacking direction of the laminated iron core to the same position, the uneven locking part by embossing and caulking pin insertion It can be determined only by considering the arrangement of either one of holes or air holes. As a result, a magnetic adverse effect can be reduced as much as possible in a narrow region at the stacking direction end of the laminated core of the rotor, and a laminated core without deteriorating the motor performance can be obtained.

  In addition, by mounting the electric motor using this laminated iron core in the compressor of an outdoor unit such as a refrigerator or an air conditioner, or by mounting it as an electric motor used for a vehicle, an electric motor that reduces magnetic adverse effects as much as possible is obtained. be able to.

  In addition, since the concave and convex anchoring portions can be arranged without difficulty in the magnetically affected position of the laminated iron core, it is possible to reduce the size and weight of the laminated iron core of the motor, and in turn to install a compressor for an outdoor unit such as a refrigerator or air conditioner. It can be reduced in size and weight, and can be easily mounted in a narrow vehicle mounting space.

  The present invention will be described with reference to the drawings. FIG. 1 shows a concentrated winding type electric motor in which a winding 2 is directly wound around a plurality of teeth 3 of a stator 1 via insulating bobbins (not shown for convenience). The stator 1 of the embodiment has 2n poles, and the stator 1 has 3n slots. In FIG. 1, a three-phase Y connection is used, and a winding 2 is directly wound around a six-slot stator 1 to form four poles.

  The stator 1 includes a tooth portion 3 and a yoke portion 4, and includes a laminated iron core obtained by laminating electromagnetic steel plates made of thin steel plates. The stator 1 has an uneven portion locking portion 6a by embossing for integrally laminating and fixing thin steel plate electromagnetic steel plates, a cooling through hole 5a for reducing the temperature rise of the laminated core, and the like. is doing. Note that the temperature of the laminated iron core is applied to the yoke portion 4 of the stator 1 shown in FIG. 1 in which the magnetic flux density is very narrow and the magnetic flux density is concentrated toward the center of the inner diameter of the stator 1. It is preferable not to provide the cooling through-hole 5a for reducing the rise or the embossed uneven portion locking portion 6a.

  In the embodiment in FIG. 1, the locking portion 6 a for the uneven portion due to embossing and the through-hole 5 a for cooling for reducing the temperature rise of the laminated core are the yoke portion 4 and the yoke portion 4 that are adjacent in the circumferential direction. Is provided at a portion where the magnetic flux density is low, in other words, at a portion where the root portion of the tooth portion 3 extending toward the center of the inner diameter of the stator 1 intersects with the yoke portion 4 and where the magnetic flux density is low. That is, since the embossed retaining portions 6a and through holes 5a are provided by embossing without interfering with the magnetic path in the laminated iron core of the stator 1, the magnetic adverse effect is reduced as much as possible and the motor performance is deteriorated. There is no. The through hole 5a has the same effect even if it is a bolt insertion hole because the laminated iron core is fixed to the housing with a bolt.

  Moreover, as shown in FIG. 1, the uneven | corrugated anchoring | locking part 6a by the embossing for integrally laminating and fixing the magnetic steel plates of the thin steel plate of the stator 1 and cooling for reducing the temperature rise of the laminated core The through hole 5a is integrated with at least one at the same position. As a result, the latching portion 6a of the uneven portion, the through hole 5a, etc. can be comfortably provided in the laminated core of the motor core that has been reduced in size and weight, and the magnetic flux density of the narrow yoke portion 4 and teeth portion 3 is severe. They can be arranged, and can be easily configured only by considering one of the arrangements.

  Specifically, FIG. 2 shows a detailed cross-sectional view of the A-A ′ portion of FIG. 1. At least one of a plurality of through-holes 5a penetrated in the laminating direction of the laminated core 1a is provided with a concave portion having a circumferential length slightly larger than the through-hole 5a in the laminating direction. The laminated iron core is formed by caulking together the thin steel plates by engaging the convex portion having a circumferential length slightly larger than the through-hole 5a provided in the electromagnetic steel plates of adjacent thin steel plates. In other words, the locking portion 6a of the concavo-convex portion by embossing is provided around the through-hole 5a and joined by the locking portion of the doughnut-shaped concavo-convex portion.

  The locking depth of the locking portion of the laminated iron core 1b varies depending on the thickness of the electromagnetic steel plate of the thin steel plate, but is a concave shape shallower than the plate thickness, and the connecting portion between the laminated iron cores 1a and 1b is preferably approximately 0. By setting the thickness to about 2 mm to 0.1 mm, it is possible to firmly fix the electromagnetic steel sheets of thin steel plates laminated in the laminating direction. In addition, since this through-hole 5a fixes a laminated iron core to a housing with a volt | bolt, the same effect is acquired even if it is a bolt insertion hole.

  Moreover, the case where this embodiment is used for the laminated iron core of a rotor is demonstrated in FIG. The rotor 10 shown in the embodiment of FIG. 3 is a permanent magnet embedded rotor in which permanent magnets 9 a to 9 c are embedded in the permanent magnet accommodation hole 8. The shape of the permanent magnet accommodation hole 8 is a concave permanent shape in which the bottom of the permanent magnet accommodation hole is close to the central shaft hole 11 of the rotor 10 and extends from both ends of the bottom of the permanent magnet accommodation hole to the outer periphery of the rotor. This is a magnet accommodation hole 8. The permanent magnets 9a to 9c embedded in the adjacent permanent magnet accommodation holes 8 are arranged so as to have different polarities and form four poles. The shape of the permanent magnet accommodation hole is not limited to the concave shape, and can be applied to any shape such as an arc shape, a V shape, and a bowl shape.

  On the outer peripheral side of the rotor 10, noise, vibration, or leakage of magnetic flux due to cogging torque is reduced in the portion between the magnetic poles between the permanent magnet housing hole 8 and the permanent magnet housing hole 8 that are adjacent to each other. A concave groove 7a is provided. The concave groove 7a is not limited to a groove shape, and may be a hole shape. Any shape that is magnetically spaced from the teeth of the stator may be used. Further, a convex portion 7b is formed on the outer peripheral side of the permanent magnet accommodation hole 8 with respect to the concave groove 7a. Thereby, the magnetic flux generated by the permanent magnets 9a to 9c can be concentrated on the convex portion 7b, and the performance of the electric motor can be improved.

  A caulking pin insertion hole 5b and an air hole 12 are provided in the portion between the magnetic poles between the permanent magnet accommodation hole 8 and the permanent magnet accommodation hole 8 which are adjacent to each other. Yes. In the caulking pin insertion hole 5b, end plates (not shown) for closing both ends of the laminated iron core are arranged so that the permanent magnets 9a to 9c do not protrude from the permanent magnet receiving holes 8 provided in the laminated iron core. A caulking pin for integrally fixing the plate and the laminated iron core is inserted. The air holes 12 are holes for circulating a coolant, oil, and the like for cooling the rotor 10 and a device in which the electric motor including the rotor 10 is incorporated.

  The caulking pin insertion hole 5b penetrated in the laminating direction of the laminated iron core has an uneven portion locking portion 6b by embossing for integrally laminating and fixing the electromagnetic steel plates of the thin steel plates adjacent to each other in the laminating direction. Yes. The concave-convex locking portion 6b has a concave-convex shape with a larger circumference than the caulking pin insertion hole 5b, and the electromagnetic steel plates of the thin steel plates are locked together and fixed together. A partial detailed cross-sectional view B-B 'of the locking portion 6b of the uneven portion shown in FIG. 3 will be described with reference to FIG.

  FIG. 4 shows that the embossed retaining portion 6b of the concavo-convex portion has a circumferential length slightly larger than the caulking pin insertion hole 5b in at least one of the plurality of caulking pin insertion holes 5b penetrating in the stacking direction of the laminated core 10a. The laminated iron core 10b is formed by caulking the thin steel plates together by providing concave portions and retaining the circumferential convex portions slightly larger than the caulking pin insertion holes 5b provided in the electromagnetic steel plates of the thin steel plates adjacent in the laminating direction. . In other words, the locking portion 6b of the uneven portion formed by embossing is coupled with the locking portion of the uneven portion of the donut shape provided around the caulking pin insertion hole 5b.

  Similar to the description of the locking portion of the uneven portion of the stator 1, the locking depth of the locking portion of the laminated iron core 10b varies depending on the thickness of the electromagnetic steel plate of the thin steel plate, but is a recess shape shallower than the plate thickness. And the thin-plate electrical steel sheet laminated | stacked on the lamination direction can be firmly fixed by making the connection part of 1a and 1b of a laminated iron core into about 0.2 mm-0.1 mm preferably.

  In addition, although the uneven | corrugated locking part 6b of this embodiment is an uneven | corrugated shape of the circumference larger than the caulking pin insertion hole 5b around the caulking pin insertion hole 5b, it is not limited to the caulking pin insertion hole 5b, and cooling is carried out. Even if it is provided around the air hole 12 provided for the purpose, the same effect can be obtained.

  Further, as another embodiment, a laminated portion provided with a concave and convex portion having a circumferential length slightly larger than the permanent magnet accommodating hole 8 shown in FIG. 3 and provided with a concave and convex portion in which electromagnetic steel plates of a thin steel plate are caulked together. It can also be set as the iron cores 10a and 10b. In this case, the locking portion of the concavo-convex portion may be provided over the entire circumference of the permanent magnet accommodation hole 8, but may be provided partially or intermittently.

  5 and 6 are partial cross-sectional views when the laminated iron core of the rotor and both end portions of the laminated iron core are closed with end plates and caulked with caulking pins 13. FIGS. 5 and 6 are partial cross-sectional views of the locking portions 6c (FIG. 5) and 6d (FIG. 6) of the concavo-convex portion in which the end plates 14a and 14b are arranged at both ends of the laminated core 10a and integrally fixed by the caulking pin 13. It is.

  The end plate 14a shown in FIG. 5 is directly mounted on the locking portion 6c of the concavo-convex portion provided around the caulking pin insertion hole 5b, and crimps the laminated iron core 10a and the end plate 14a together. As a result, a slight gap is generated between the end plate 14a and the locking portion 6c of the concavo-convex portion, and a spring effect is generated in the end plate 14a by this gap and can be fixed securely.

  Moreover, the shape of the end plate 14b of FIG. 6 is a concavo-convex shape similarly to the engaging portion 6d of the concavo-convex portion provided around the caulking pin insertion hole 5b. It is preferable that the concave and convex portions of the concavo-convex shape allow the header portion (head portion) of the caulking pin 13 to enter the concave portion. Thereby, when the laminated iron core 10a and the end plate 14b are caulked together, the protrusion of the header portion (head portion) of the caulking pin 13 can be minimized.

  In addition, by mounting the electric motor using this laminated iron core in the compressor of an outdoor unit such as a refrigerator or an air conditioner, or by mounting it as an electric motor used for a vehicle, an electric motor that reduces magnetic adverse effects as much as possible is obtained. be able to.

  In addition, since the latching part of the concave and convex portions is arranged without difficulty in the position where the magnetic force of the laminated iron core is less affected, the laminated iron core of the motor can be reduced in size and weight, and as a result, outdoor units such as refrigerators and air conditioners. The compressor can be reduced in size and weight, and can be easily mounted in a narrow vehicle mounting space.

The figure which shows the through-hole and uneven | corrugated anchoring | locking part of the laminated iron core in this embodiment. FIG. 2 is a detailed cross-sectional view of the A-A ′ portion of the locking portion between the through hole and the uneven portion in FIG. 1. The figure which shows the crimping pin insertion hole of the laminated iron core of the rotor in this embodiment, and the locking part of an uneven | corrugated | grooved part. FIG. 4 is a detailed cross-sectional view of the caulking pin insertion hole and the B-B ′ portion of the engaging portion of the uneven portion in FIG. 3. The laminated iron core and end plate are caulked together with caulking pins. The figure in another embodiment which crimped the laminated iron core and the end plate integrally with the crimping pin. The figure which shows the through-hole and uneven | corrugated | grooved part retaining part of the conventional laminated iron core. The figure which shows the caulking pin insertion hole of the conventional laminated iron core of a rotor, and the latching part of an uneven | corrugated | grooved part.

Explanation of symbols

1, 15 ... Stator.
1a, 1b, 10a, 10b ... laminated iron core.
2, 16 ... windings.
3, 17 ... Teeth part.
4, 18 ... Yoke part.
5a, 5c ... through holes.
5b, 5d ... caulking pin insertion holes.
6a to 6d, 19a, 19b, 20...
7a ... concave groove.
7b: convex portion.
8, 32 ... Permanent magnet accommodation holes.
9a-9c, 33 ... Permanent magnet.
34... Magnetic flux short-circuit prevention gaps 10 and 30... Rotor.
11, 31 ... shaft hole 12, ... air hole 13 ... caulking pin.
14a, 14b ... end plates.

Claims (5)

In a laminated core in which a plurality of thin steel plates punched by a punching press or the like are laminated, the laminated iron core is a laminated iron core that is caulked integrally by providing an engaging portion that can be engaged with each other by providing uneven portions on the adjacent thin steel plates. ,
The concave and convex portions of the concave and convex portions are concave and convex shapes having a circumferential length larger than that of the through holes in at least one of the plurality of through holes penetrating in the stacking direction of the laminated iron cores, and the thin steel plates are locked and integrated. Laminated iron core characterized by caulking. In a laminated core in which a plurality of thin steel plates punched by a punching press or the like are laminated, the laminated iron core is laminated with a rotor that is caulked integrally by providing an uneven portion on the adjacent thin plate iron plate and locking each other. Iron core,
At the center of the laminated core, a shaft hole for inserting a rotating shaft, a plurality of permanent magnet receiving holes for inserting permanent magnets, and a permanent magnet does not jump out of the laminated core and the laminated core from the stacking direction end. A plurality of caulking pin insertion holes for integrally caulking and joining the end plates to the caulking pins,
The engaging portion of the uneven portion has an uneven shape with a circumferential length larger than that of the caulking pin insertion hole in at least one of the plurality of caulking pin insertion holes penetrating in the stacking direction of the laminated iron core, and holds the thin steel plates together. A rotor that is caulked together. In a laminated core in which a plurality of thin steel plates punched by a punching press or the like are laminated, the laminated iron core is laminated with a rotor that is caulked integrally by providing an uneven portion on the adjacent thin plate iron plate and locking each other. Iron core,
At the center of the laminated core, a shaft hole for inserting a rotating shaft, a plurality of permanent magnet receiving holes for inserting permanent magnets, and a permanent magnet does not jump out of the laminated core and the laminated core from the stacking direction end. A plurality of caulking pin insertion holes for integrally caulking and joining the end plates for crimping, and an air hole for cooling the rotor,
The engaging portion of the uneven portion has an uneven shape with a circumferential length larger than the air hole in at least one of the plurality of air holes penetrating in the stacking direction of the laminated iron core, and the thin steel plates are locked together and integrated. Rotor characterized by caulking. The electric motor according to any one of claims 1 to 3, wherein the laminated iron core is used in an electric motor mounted in a compressor of an outdoor unit such as a refrigerator or an air conditioner. The electric motor according to any one of claims 1 to 3, wherein the laminated iron core is used for an electric motor for a vehicle.

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