JP2005287134A - Method of manufacturing motor core, motor core and high frequency motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a split core and a rotor core by a laminated steel sheet at low cost without furnishing a large-scale apparatus without using a special material. <P>SOLUTION: A method of manufacturing a motor core in which a laminated steel sheet is laminated and the laminated steel sheet is integrated, includes an annealing step (STEP: 05), and a step (STEP: 06) of adhering the laminated steel sheet laminated after the annealing step. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor core manufacturing method configured by stacking iron plates, a motor core, and a high-frequency motor using the motor core.

  It is known that iron loss of a motor core, for example, loss due to generation of hysteresis or eddy current increases in proportion to the square of the frequency of current applied to the coil for the motor core, and iron loss, particularly eddy current. It is also known that the loss due to the occurrence of the loss decreases in proportion to the square of the plate thickness of the iron plate (magnetic steel plate) constituting the motor core.

  For this reason, conventionally, in a high-frequency motor, a motor core is configured by insulating and laminating thin electromagnetic steel sheets to reduce iron loss.

  As the motor speed increases, the thickness of the electromagnetic steel sheet (hereinafter referred to as the laminated steel sheet) is further reduced due to the higher frequency of the motor, and the thickness of the laminated steel sheet is currently 0.35 mm or less, for example, 0.1 mm. It has become.

  For this reason, when manufacturing a motor core, it is necessary to integrate a number of thin laminated steel plates in the manufacturing process or as a product, and various means for integrating laminated steel plates have been adopted conventionally. Yes.

  For example, in Patent Document 1, laminated steel plates are integrated by caulking, and in Patent Document 2, laminated steel plates are bonded together by a heat-fusible glass-based inorganic material. There is also a method of integrating laminated steel sheets by welding.

  A method for manufacturing a motor core using caulking will be described with reference to FIG.

  A thin strip is cut into a strip-shaped slit in accordance with the punching of the laminated steel sheet, and the laminated steel sheet is punched with a die or the like from the slit.

  Laminated steel sheets are stacked, a required portion is extruded and deformed by a caulking die, etc., and the laminated steel sheets are meshed and integrated (hereinafter, the integrated structure is referred to as a core).

  Processing distortion occurs due to punching and caulking of laminated steel sheets. Since the processing strain degrades the magnetic properties of the laminated steel sheet, annealing is performed. Annealing is carried out at a temperature of 700 ° C. or higher to remove the distortion of the laminated steel sheet and restore the magnetic properties.

  By completing the annealing, the core as a product is completed.

  In the manufacturing method of a motor core using caulking, laminated steel sheets such as drilling and extrusion are deformed for caulking. For this reason, since the magnetism is disturbed and loss occurs in the caulking portion, it is necessary to prevent the magnetism from flowing through the caulking portion, and there are constraints on the design such as the core shape and the caulking location, or the magnetic characteristics to be generated. There was a problem that happened.

  With reference to FIG. 4, a method for manufacturing a motor core in which laminated steel sheets are bonded with a heat-fusible glass-based inorganic material will be described.

  A heat-fusible glass-based inorganic material is applied (coated) to the steel plate material. The coating is applied to the entire surface in the state of a thin original plate, or is cut into a band-shaped slit from the thin original plate in accordance with the punching of the laminated steel plate, and applied to the entire surface of the slit.

  A laminated steel sheet is punched from the slit with a die or the like. Stack the punched laminated steel sheets.

  Annealing is performed to remove machining distortion during punching. By heating at the time of annealing, the glass-based inorganic material is melted and bonded between the laminated steel plates.

  When the annealing is completed, the magnetic properties are restored, and the laminated steel plates are integrated by bonding, thereby forming a core.

  In the manufacturing method of the motor core in which the laminated steel sheet is bonded with the glass-based inorganic material, a large-scale facility for applying the glass-based inorganic material to the slit is required, and the glass-based inorganic material generally has no adhesive force and is special. There was a problem that the motor core could not be manufactured at a low cost, such as the need for glass-based inorganic materials and high material costs.

  Moreover, the manufacturing method of the motor core which integrates a laminated steel plate by welding is demonstrated with FIG.

  Note that the process up to the lamination process of the laminated steel sheets is the same as the motor core manufacturing method using the caulking described above.

  When the laminated steel plates are stacked in a core shape, the required portions are welded in the plate thickness direction to integrate the laminated steel plates. After integration, the core is annealed. In addition, when deterioration of the structure of a welded part or the like becomes a problem, welding is performed after annealing.

  In the manufacturing method of the motor core in which the laminated steel plates are integrated by welding, the laminated steel plates are short-circuited at the welded portions, and the portions where magnetism passes must be avoided, and there are restrictions on the welding locations. In addition, there is a stator-side core that is divided into a plurality of parts. However, with such a split-type core, the number of welds increases, and it becomes difficult to avoid the part that passes through the magnetism. In other words, there was a problem that welding could not be used. The rotor-side core rotates in a magnetic field, and it is difficult to perform welding while avoiding a portion that passes through the magnetism, and there is a problem that a motor core cannot be manufactured by welding.

JP 2003-289635 A

JP 54-18803 A

  In view of such circumstances, the present invention provides a motor core manufacturing method and a motor core for manufacturing a split core and a rotor core at low cost without using a special material, without installing a large-scale apparatus, and further, A high frequency motor using the motor core is provided.

  The present invention provides a motor core manufacturing method in which laminated steel plates are laminated and the laminated steel plates are integrated to produce a motor core, and includes an annealing step and a step of bonding the laminated steel plates laminated after the annealing step. The present invention relates to a method for manufacturing a motor core.

  The present invention also relates to a method for manufacturing a motor core, wherein the laminated steel plates are bonded by vacuum impregnating an adhesive between the laminated steel plates.

  In addition, the present invention relates to a motor core configured such that a required number of laminated steel plates are bonded and integrated by an adhesive permeated between the laminated steel plates by vacuum impregnation.

  In the present invention, the motor core is divided as necessary, the divided portion is constituted by the required number of the laminated steel plates, and the laminated steel plates are bonded and integrated by an adhesive that has penetrated between the laminated steel plates by vacuum impregnation. It concerns the motor core.

  Furthermore, the present invention relates to a high frequency motor in which a motor core is formed by laminating a required number of laminated steel plates, and the laminated steel plates are bonded and integrated by an adhesive that has permeated between the laminated steel plates by vacuum impregnation. .

  According to the present invention, in a motor core manufacturing method in which laminated steel plates are laminated and the laminated steel plates are integrated to produce a motor core, an annealing step, and a step of bonding the laminated steel plates laminated after the annealing step; Therefore, it is not necessary to use a special adhesive for bonding, no large apparatus is required for bonding, and the magnetic properties of the motor core are not impaired.

  Also, according to the present invention, the required number of laminated steel plates are bonded and integrated with an adhesive permeated between the laminated steel plates by vacuum impregnation, and therefore, it is necessary to use a special adhesive for bonding. In addition, there is no need for a large apparatus for bonding, and the magnetic properties of the motor core are not impaired.

  Further, according to the present invention, the motor core is divided as required, the divided portion is constituted by the required number of the laminated steel plates, and the laminated steel plates are bonded and integrated by an adhesive that has penetrated between the laminated steel plates by vacuum impregnation. Therefore, the magnetic characteristics of the motor core are not impaired even with respect to the split motor core.

  Further, according to the present invention, the motor core is constituted by laminating a required number of laminated steel sheets, and the laminated steel sheets are bonded and integrated by an adhesive that has permeated between the laminated steel sheets by vacuum impregnation, so that the magnetic properties are low. Excellent effects such as being able to make a high frequency motor excellent in

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  A method for manufacturing a motor core according to the present invention will be described with reference to FIG.

  An insulating film is formed on the thin original plate. The insulating film is formed at the time of manufacturing the thin plate, and the thin plate is supplied with the insulating film formed thereon. Therefore, the process of forming the insulating film can be omitted when the motor core is manufactured.

  A strip-shaped slit is cut from the original plate in accordance with the punching of the laminated steel plate (STEP: 01), and the laminated steel plate is punched from the slit with a mold or the like (STEP: 02).

  The laminated steel sheets are stacked in a core shape (STEP: 03) and temporarily fixed with a simple jig (STEP: 04).

  The jig includes a clamp for stacked laminated steel sheets, or a jig that is stored in a case at the same time as the laminated steel sheets are punched and integrated by the case. By temporarily fixing the laminated steel plate, the handleability in the case of proceeding the following steps is improved.

  In the temporarily fixed state, the laminated steel sheet is annealed at 700 ° C. or higher (STEP: 05), the processing distortion is removed, and the magnetic properties are recovered. The above-described insulating film is not deteriorated by annealing and maintains the insulating characteristics.

  In the temporarily fixed state, an adhesive is soaked between the laminated steel plates by vacuum impregnation to bond the laminated steel plates (STEP 06).

  As the adhesive, an organic resin such as an epoxy resin, a polyimide resin, or a silicon resin can be used.

  In addition, the heat resistance required for use in high-frequency motors may be required to be 200 ° C or higher, but some of the above-mentioned organic resin adhesives maintain heat resistance at 250 ° C or higher. It is possible to use an organic resin adhesive.

  Further, vacuum impregnation is a method in which the laminated steel plates are evacuated and the adhesive is infiltrated between the laminated steel plates. For example, the integrated laminated steel plates are evacuated in a treatment tank, and then the liquid resin is transferred to the treatment tank. Then, the laminated steel sheet in a vacuum state is immersed in an adhesive solution, and the adhesive is infiltrated between the laminated steel sheets. Alternatively, various methods such as immersing the integrated laminated steel sheet in an adhesive solution, evacuating them together in a treatment tank, and allowing the adhesive to penetrate between the laminated steel sheets can be considered.

  When the bonding is completed, the temporary fixing jig is removed to complete the motor core.

  The annealing may be performed in an individual state without integrating the laminated steel sheets, and then integrated. At that time, an adhesive may be applied to the surface of the laminated steel sheet, stacked in a core shape, and further evacuated in a vacuum chamber. Also in this case, the adhesive penetrates evenly between the laminated steel plates by vacuuming (vacuum impregnation).

  FIG. 2 shows a split type motor core 1.

  The motor core 1 is a stator-side motor core, and the motor core 1 is divided into a tooth portion 2 and a yoke portion 3, and the yoke portion 3 is further divided into required equal parts (in the figure, equal to four parts). It is composed of four yokes 4. The teeth portion 2 and the yoke 4 are each manufactured by the above-described motor core manufacturing method.

  The yoke portion 3 has a cylindrical shape, and a connecting groove 5 is formed on the inner surface in parallel with the center line.

  Further, the teeth portion 2 is formed with the same number of teeth 7 as the connecting grooves 5 from the central cylindrical portion 6 in a radial manner, and the tips of the teeth 7 can be fitted with the connecting grooves 5. .

  When the motor core 1 is assembled, the yoke portion 3 is attached to the teeth portion 2 from the outside. At this time, the teeth 7 are fitted into the connecting grooves 5 so that the positioning and joining of the teeth 2 and the yoke 3 can be easily performed. Further, the joining of the tooth portion 2 and the yoke portion 3 is only the fitting of the connecting groove 5 and the tooth 7, and no radial compressive force acts on the teeth 7, and the yoke portion 3 Is divided in the circumferential direction, the compressive force in the circumferential direction is not generated in the yoke portion 3 as well. Therefore, the motor core 1 does not generate unnecessary stress due to assembly and does not impair the magnetic characteristics.

  Furthermore, the teeth portion 2 and the yoke portion 3 have laminated steel plates integrated with an adhesive, and the laminated steel plates are completely insulated. Therefore, there are elements that obstruct magnetic flow and elements that short circuit magnetism. Therefore, the motor core 1 with less iron loss and excellent magnetic characteristics can be configured.

It is a flowchart which shows embodiment of this invention. It is a perspective view which shows the motor core which concerns on this invention. It is a flowchart which shows the manufacturing method of the motor core of a prior art example. It is a flowchart which shows the manufacturing method of the motor core of another prior art example. It is a flowchart which shows the manufacturing method of the motor core of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor core 2 Teeth part 3 Yoke part 4 Yoke 5 Connection groove 6 Central cylindrical part 7 Teeth

Claims (5)

  In a motor core manufacturing method in which laminated steel plates are laminated and the laminated steel plates are integrated to produce a motor core, the method includes an annealing step and a step of bonding the laminated steel plates laminated after the annealing step. A method for manufacturing a motor core.   The method of manufacturing a motor core according to claim 1, wherein the laminated steel plates are bonded by vacuum impregnating an adhesive between the laminated steel plates.   A motor core characterized in that a required number of laminated steel plates are bonded and integrated with an adhesive permeated between the laminated steel plates by vacuum impregnation.   The motor core according to claim 3, wherein the motor core is divided as required, a divided portion is constituted by a required number of the laminated steel plates, and the laminated steel plates are bonded and integrated by an adhesive that is permeated between the laminated steel plates by vacuum impregnation. .   A high-frequency motor, wherein a motor core is formed by laminating a required number of laminated steel plates, and the laminated steel plates are bonded and integrated by an adhesive permeated between the laminated steel plates by vacuum impregnation.

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