JP2016077035A - Magnet assembly for field pole, rotor core, method of manufacturing the magnet assembly for field pole, and method of disassembling the magnet assembly for field pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet assembly for a field pole, a rotor core, a method of manufacturing the magnet assembly for a field pole, and a method of disassembling the magnet assembly for a field pole, which enable an adhesive to be prevented from remaining attached when the magnet assembly is recycled.SOLUTION: A magnet assembly for a field pole 30 includes a plurality of magnet pieces 31 bonded to each other with an adhesive 40. An adhesive resin to be detached by electrolysis is used for the adhesive 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a field pole magnet body, a rotor core, a method for manufacturing a field pole magnet body, and a method for disassembling a field pole magnet body.

  Patent Document 1 discloses a method for manufacturing a permanent magnet in which split pieces formed by cleaving a permanent magnet are fitted together to restore the permanent magnet. The permanent magnet manufactured in this way suppresses the generation of eddy currents. Specifically, Patent Document 1 discloses that split pieces are bonded to each other with a resin and restored to a permanent magnet.

JP 2009-148201 A

  The field pole magnet body can be recycled. However, when a field pole magnet body formed by bonding a plurality of magnet pieces with an adhesive is recycled, the adhesive may remain attached to the magnet pieces as impurities. For example, the adhesive may be heated when demagnetizing the field pole magnet body, and may remain attached to the magnet piece in a carbonized state.

  The present invention has been made in view of the above, and when recycling, it is possible to suppress that the adhesive remains attached as an impurity, and a field pole magnet body, a rotor core, a method of manufacturing a field pole magnet body, and It is an object of the present invention to provide a method for disassembling a field pole magnet body.

  A field pole magnet body according to an aspect of the present invention is a field pole magnet body formed by bonding a plurality of magnet pieces with an adhesive, and the plurality of magnet pieces are electrolyzed adhesive resin. It is characterized by being constituted by bonding with materials.

  According to the field pole magnet body of the above aspect, the plurality of magnet pieces are bonded together by the electrolytic adhesive resin material. For this reason, when recycling, a voltage is applied between the magnet pieces bonded by the electrolytic adhesive resin material, so that the magnet pieces to which the anode is connected are separated from the adhesive. Can be generated. As a result, it is possible to suppress the adhesive remaining as an impurity.

FIG. 1 is a schematic configuration diagram illustrating a configuration of a main part of a permanent magnet type electric motor including a field pole magnet body and a rotor core according to the first embodiment. FIG. 2 is a diagram showing a field pole magnet body. FIG. 3 is an explanatory diagram of a first example of a method of disassembling the field pole magnet body according to the first embodiment. FIG. 4 is an explanatory diagram of a second example of the method for disassembling the field pole magnet body according to the first embodiment. FIG. 5 is an explanatory diagram of a method for taking out the field pole magnet body according to the first embodiment. FIG. 6 is an explanatory diagram of a first example of a method for extracting a field pole magnet body according to the second embodiment. FIG. 7 is an explanatory diagram of a second example of a method for extracting a field pole magnet body according to the second embodiment. FIG. 8 is a diagram for explaining the length of the portion of the conductive tab that protrudes from the end face in the rotation axis direction of the rotor core. FIG. 9 is a diagram illustrating a state in which the conductive tab is folded toward the radially inner side of the rotor. FIG. 10 is an explanatory diagram of a first example of a method for disassembling the field pole magnet body according to the second embodiment. FIG. 11 is an explanatory diagram of a second example of the method of disassembling the field pole magnet body in the second embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The same reference numerals given throughout the drawings indicate the same or corresponding configurations.

<First Embodiment>
FIG. 1 is a schematic configuration diagram illustrating a configuration of a main part of a permanent magnet type electric motor including a field pole magnet body 30 and a rotor core 21 according to the first embodiment. In FIG. 1, the left diagram is a cross-sectional view of a permanent magnet motor, and the right diagram is a side view. This permanent magnet type electric motor is mounted on, for example, an electric vehicle and used as a drive source for the vehicle. However, the application destination of the permanent magnet type electric motor is not limited to an automobile.

  A permanent magnet type electric motor (hereinafter, simply referred to as “motor”) includes an annular stator 10 that constitutes a part of a casing (not shown), and a columnar rotor 20 that is arranged coaxially with the stator 10. .

  The stator 10 includes a stator core 11 and a plurality of coils 12. The plurality of coils 12 are accommodated in slots 13 formed at equal angular intervals on the same circumference around the axis O in the stator core 11.

  The rotor 20 includes a rotor core 21 and a rotating shaft 23 that rotates integrally with the rotor core 21. In the rotor core 21, slots (magnet insertion holes) 22 are formed at equal angular intervals on the same circumference around the axis O, and a field pole magnet body 30 is accommodated in each slot 22. . The field pole magnet body 30 constitutes a permanent magnet.

  The rotor core 21 is formed in a cylindrical shape in which a plurality of laminated steel plates made of a ferromagnetic material formed in an annular shape are stacked along the axial direction of the rotary shaft 23, and an insulating coating is applied to the outer surface. . For this reason, the rotor core 21 itself has conductivity.

  As shown in FIG. 2, the field pole magnet body 30 is configured by joining a plurality of magnet pieces 31 with an adhesive 40. The plurality of magnet pieces 31 are produced by cleaving the magnet base material of the field pole magnet body 30. Therefore, the field pole magnet body 30 is configured by first dividing the magnet base material into a plurality of magnet pieces 31 by cleaving and bonding the plurality of magnet pieces 31 produced by the division with the adhesive 40. The plurality of magnet pieces 31 can be bonded to each other by the adhesive 40 at the cut surfaces.

  Specifically, the field pole magnet body 30 can be configured as follows. That is, first, a plurality of magnet pieces 31 are produced by cleaving along a width direction a magnet base material having a rectangular shape in plan view in the thickness direction. Then, the produced magnet pieces 31 are joined to each other by the adhesive 40 at the cut surfaces. Thereby, the field pole magnet body 30 is configured as an aggregate of magnet pieces 31 aligned in a line. The plurality of magnet pieces 31 may be produced by cutting the magnetic base material of the field pole magnet body 30 with a cutter or the like.

  An electrolysis adhesive resin material is used for the adhesive 40. The electrolytic adhesive resin material is an adhesive resin material having a property of peeling when an electric current is applied (voltage is applied). As the electrolysis adhesive resin material, for example, an epoxy resin containing an epoxy compound or an adhesive resin material containing an acrylic polymer and an electrolytic solution can be used. The adhesive 40 may be a sheet adhesive. The shape of the adhesive 40 as the sheet-like adhesive may be a plate shape or a mesh shape.

  The field pole magnet body 30 reduces eddy currents generated by fluctuations in the applied magnetic field by retaining the eddy currents in the individual magnet pieces 31. Thereby, the heat generation of the field pole magnet body 30 due to the eddy current is suppressed, and irreversible thermal demagnetization is prevented. The field pole magnet body 30 is fixed to the slot 22 using an adhesive 40.

  Next, the field pole magnet body 30 will be further described.

  The magnet base material of the field pole magnet body 30 can be configured using a material having a good electrical conductor. The magnet base material is, for example, a neodymium iron boron based sintered magnet or a samarium cobalt based sintered magnet. The magnet base material of the field pole magnet body 30 may be an insulator magnet. The insulator magnet is an insulative magnet, for example, a ferrite magnet.

  The magnet pieces 31 may be individually manufactured by sintering. Specifically, the magnet piece 31 may be a conductor magnet individually manufactured by sintering using a material having a good electrical conductor. Moreover, the insulator magnet produced separately by sintering may be sufficient. The plurality of magnet pieces 31 may be configured by a combination of these conductor magnets and insulator magnets. The plurality of magnet pieces 31 may be a combination of a magnet piece 31 produced by cleaving or cutting and a magnet piece 31 produced individually by sintering.

  When the magnet piece 31 is an insulator magnet, generation | occurrence | production of an eddy current can be suppressed with high electrical resistance. Such a magnet piece 31 can be subjected to a surface treatment using a conductive material, particularly a material having high electrical conductivity. Examples of the highly conductive material used for the surface treatment include nickel, aluminum, copper, gold, and alloys thereof.

  Next, a method for disassembling the field pole magnet body 30 will be described.

  FIG. 3 is an explanatory diagram of a first example of a method for disassembling the field pole magnet body 30 according to the first embodiment. In this example, the case where each of the magnet pieces 31 coupled by the adhesive 40 is a conductor magnet configured using a material having a good electrical conductor is shown. The field pole magnet body 30 is disassembled as follows. That is, the field pole magnet body 30 is placed on an insulating base, and the anode terminal is connected to one magnet piece 31 and the cathode terminal is connected to the other magnet piece 31 joined by the adhesive 40, and the anode terminal and A voltage is applied between the cathode terminals. Thereby, since peeling arises between the magnet piece 31 to which the anode is connected, and the adhesive 40, the field pole magnet body 30 can be easily disassembled.

  FIG. 4 is an explanatory diagram of a second example of a method for disassembling the field pole magnet body 30 according to the first embodiment. In this example, the case where one magnet piece 31 joined by the adhesive 40 is an insulator magnet and has been subjected to the above-described surface treatment is shown. Moreover, the example in case the other magnet piece 31 is a conductor magnet is shown. Also in this case, the field pole magnet body 30 can be disassembled as in the first example shown in FIG.

  By the way, the field pole magnet body 30 can be fixed to the slot 22 using the adhesive 40. The surface treatment described above can also be applied to the entire field pole magnet body 30. In this case, the field pole magnet body 30 can be removed from the rotor core 21 as follows.

  FIG. 5 is an explanatory diagram of a method of taking out the field pole magnet body 30 in the first embodiment. When the field pole magnet body 30 is taken out from the rotor core 21, the rotor 20 is placed on an insulating base, the anode terminal is connected to the field pole magnet body 30, the cathode terminal is connected to the rotor core 21, and the anode terminal and the cathode terminal are connected. A voltage is applied between them. Thereby, peeling occurs between the field pole magnet body 30 to which the anode is connected and the adhesive 40. As a result, the field pole magnet body 30 can be removed from the rotor core 21.

  When disassembling the surface-treated field pole magnet body 30 as described with reference to FIGS. 3 and 4, the surface treatment is previously peeled off, and then the field pole magnet body 30 is disassembled. It can be carried out. When the surface treatment is performed on the field pole magnet body 30 and the magnet piece 31, the surface treatment may be performed so as not to overlap.

  As described above, in the first embodiment, the field pole magnet body 30 is configured by combining the plurality of magnet pieces 31 with the adhesive 40 that is an electrolytic adhesive resin material. In the field pole magnet body 30 configured as described above, when recycling, by applying a voltage between the magnet pieces 31 coupled by the adhesive 40, the magnet piece 31 to which the anode is connected and It becomes possible to cause peeling between the adhesive 40. As a result, it is possible to suppress the adhesive 40 from remaining attached as impurities.

  The field pole magnet body 30 can be further subjected to a surface treatment using a conductive material. According to the field pole magnet body 30 configured as described above, a voltage is applied between the field pole magnet body 30 and the rotor core 21 during recycling by being fixed to the slot 22 using the adhesive 40. Thus, the field pole magnet body 30 can be easily taken out. In addition, it is possible to prevent the adhesive 40 that fixes the field pole magnet body 30 from remaining attached as impurities.

  The rotor core 21 may be configured such that the field pole magnet body 30 is disposed in the slot 22, and the field pole magnet body 30 is fixed to the slot 22 using an adhesive 40. According to the rotor core 21 having such a configuration, the field pole magnet body 30 can be easily taken out by applying a voltage between the field pole magnet body 30 and the rotor core 21 during recycling. In addition, it is possible to prevent the adhesive 40 that fixes the field pole magnet body 30 from remaining attached as impurities.

  When disassembling the field pole magnet body 30, an anode terminal is connected to one magnet piece 31 joined by an adhesive 40, a cathode terminal is connected to the other magnet piece 31, and a voltage is applied between the anode terminal and the cathode terminal. Apply. Thereby, it becomes possible to cause peeling between the magnet piece 31 to which the anode is connected and the adhesive 40. As a result, it is possible to suppress the adhesive 40 from remaining attached as impurities during recycling.

<Second Embodiment>
The rotor core 21 and the field pole magnet body 30 in the second embodiment further include a conductive tab 50 for applying a voltage, as will be described below. The field pole magnet body 30 and the rotor core 21 in the second embodiment can be used in the above-described permanent magnet type electric motor instead of the rotor core 21 and the field pole magnet body 30 in the first embodiment.

  In the rotor core 21 in the second embodiment, as shown in FIG. 6, a conductive tab 50 is provided between the slot 22 of the rotor core 21 and the field pole magnet body 30. The conductive tab 50 is an electrode and is made of a conductive material (for example, aluminum). The conductive tab 50 is fixed to the field pole magnet body 30 and the slot 22 of the rotor core 21 by an adhesive 40. The shape of the conductive tab 50 may be a plate shape or a mesh shape.

  The conductive tab 50 protrudes outward in the rotational axis direction from the end surface in the axial direction of the rotational axis of the rotor core 21. Thereby, the terminal for applying a voltage in order to take out the field pole magnet body 30 can be easily attached to the conductive tab 50. The field pole magnet body 30 in the second embodiment can also be subjected to a surface treatment using a conductive material. In this case, the field pole magnet body 30 can be taken out from the rotor core 21 as described below.

  That is, a rotor is mounted on an insulating base, an anode terminal is connected to the field pole magnet body 30, a cathode terminal is connected to the conductive tab 50, and a voltage is applied between the anode terminal and the cathode terminal. As a result, separation occurs between the field pole magnet body 30 to which the anode is connected and the adhesive 40, so that the field pole magnet body 30 can be taken out from the rotor core 21.

  In the second embodiment, the rotor core 21 may be made of a nonconductor. Even if the rotor core 21 is made of a non-conductor, if the anode terminal is connected to the field pole magnet body 30, the cathode terminal is connected to the conductive tab 50, and a voltage is applied between the anode terminal and the cathode terminal, the field core can be removed from the rotor core 21. The magnet body 30 can be taken out. In this case, for example, a dust core produced by compression-molding a soft magnetic powder with an insulating coating can be applied to the rotor core 21.

  When the rotor core 21 is formed of a non-conductor, the conductive tab 50 is fixed to the field pole magnet body 30 in the field pole magnet body 30 and the slot 22 of the rotor core 21 by an adhesive 40 as shown in FIG. May be.

  In this case, when the field pole magnet body 30 is taken out from the rotor core 21, an anode terminal is connected to the conductive tab 50 and a cathode terminal is connected to the field pole magnet body 30, and a voltage is applied between the anode terminal and the cathode terminal. As a result, peeling occurs between the conductive tab 50 to which the anode is connected and the adhesive 40, so that the field pole magnet body 30 can be taken out from the rotor core 21. In this case, the field pole magnet body 30 may be fixed to the slot 22 of the rotor core 21 by an appropriate method such as an adhesive other than the adhesive 40. In this case, the amount of adhesive 40 used can be reduced.

  If the length of the portion where the conductive tab 50 protrudes from the end surface in the rotation axis direction of the rotor core 21 is equal to or longer than the distance from the position where the conductive tab 50 is provided to the radially outer end surface of the rotor core 21, 50 can affect the operation of the motor. Therefore, the length of the portion where the conductive tab 50 protrudes from the end face in the rotation axis direction of the rotor core 21 is shorter than the distance from the position where the conductive tab 50 is provided to the radially outer end face of the rotor core 21. To do.

  FIG. 8 is a view for explaining the length of the portion of the conductive tab 50 that protrudes beyond the end face in the rotation axis direction of the rotor core 21. In the example shown in FIG. 8, the distance from the position where the conductive tab 50 is provided to the radially outer end surface of the rotor core 21 is L1, and the conductive tab 50 protrudes beyond the end surface of the rotor core 21 in the rotation axis direction. Since the length of the portion is L2, L2 is determined so that the relationship of L1> L2 is established. In FIG. 8, the adhesive 40 provided between the conductive tab 50 and the field pole magnet body 30 and between the conductive tab 50 and the slot 22 of the rotor core 21 is omitted.

  The conductive tab 50 that protrudes outward in the rotational axis direction from the end surface in the rotational axis direction of the rotor core 21 may be configured to be folded inward in the radial direction of the rotor (in the direction of the rotational shaft 23). FIG. 9 is a view showing a state in which the conductive tab 50 protruding from the end surface of the rotor core is folded inward in the radial direction of the rotor. In this way, if the conductive tab 50 is folded toward the inner side in the radial direction of the rotor, the conductive tab 50 can be used even when pressed by an end plate (not shown) from the outer side in the rotation axis direction of the rotor when the motor is assembled. 50 can be prevented from being crushed by being crushed. In FIG. 9, the adhesive 40 provided between the conductive tab 50 and the field pole magnet body 30 and between the conductive tab 50 and the slot 22 of the rotor core 21 is omitted.

  By the way, in the field pole magnet body 30 in the second embodiment, as shown in FIG. 10, conductive tabs 50 are provided between the magnet pieces of the plurality of magnet pieces 31. The conductive tab 50 is fixed to each of the magnet pieces 31 forming the space between the magnet pieces 31 among the plurality of magnet pieces 31 by the adhesive 40.

  In the second embodiment, the field pole magnet body 30 taken out from the rotor core 21 is disassembled as follows. That is, the field pole magnet body 30 is placed on an insulating base, the anode terminal is connected to the magnet piece 31 to which the conductive tab 50 is fixed by the adhesive 40, the cathode terminal is connected to the conductive tab 50, and the anode terminal and A voltage is applied between the cathode terminals. Thereby, since peeling arises between the magnet piece 31 to which the anode is connected, and the adhesive 40, the field pole magnet body 30 can be easily disassembled.

  In the field pole magnet body 30 in the second embodiment, a magnet whose surface is insulated by a conductive magnet can also be used for the magnet piece 31. However, in this case, as shown in FIG. 11, an anode terminal is connected to the conductive tab 50, a cathode terminal is connected to the magnet piece 31 made of a conductive magnet, and a voltage is applied between the anode terminal and the cathode terminal. As a result, peeling occurs between the conductive tab 50 to which the anode is connected and the adhesive 40 that has joined the magnet piece 31 made of the conductive magnet, so that the field pole magnet body 30 can be easily disassembled. Can do.

  As described above, in the field pole magnet body 30 according to the second embodiment, the conductive tabs 50 are arranged between the magnet pieces of the plurality of magnet pieces 31, and the conductive tabs 50 are bonded to the plurality of magnet pieces 31 using the adhesive 40. Of these, the magnet piece 31 was fixed between the magnet pieces. As a result, when the field pole magnet body 30 is disassembled, it is only necessary to attach a voltage application terminal to the conductive tab 50, so that workability is improved.

  In the rotor core 21 according to the second embodiment, the conductive tab 50 is disposed between the slot 22 and the field pole magnet body 30, and the conductive tab 50 is fixed to the field pole magnet body 30 using the adhesive 40. . Thereby, when the field pole magnet body 30 is taken out, it is only necessary to attach a voltage application terminal to the conductive tab 50, so that workability is improved.

  The conductive tab 50 protrudes outward in the rotational axis direction from the end surface of the rotor core 21 in the rotational axis direction. In this case, the conductive tab 50 affects the operation of the electric motor by making the length of the protruding portion shorter than the distance from the position where the conductive tab 50 is provided to the radially outer end surface of the rotor core 21. Can be prevented.

  When the conductive tab 50 protrudes outward in the rotation axis direction from the end surface in the rotation axis direction of the rotor core 21, the protruding portion may be configured to be folded inward in the radial direction of the rotor core 21. According to this configuration, when the electric motor is assembled, it is possible to prevent the conductive tab 50 from being crushed and crunchy even when pressed by an end plate (not shown) from the outer side in the rotation axis direction of the rotor.

  When disassembling the field pole magnet body 30, the anode terminal is connected to the magnet piece 31 to which the conductive tab 50 is fixed by the adhesive 40, the cathode terminal is connected to the conductive tab 50, and a voltage is applied between the anode terminal and the cathode terminal. Apply. As a result, peeling occurs between the magnet piece 31 to which the anode is connected and the adhesive 40, so that the field pole magnet body 30 can be easily formed while suppressing the adhesive 40 from remaining attached as impurities. Can be broken down into

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, the field magnet body 30 may be fixed to the slot 22 with an adhesive different from the adhesive 40 that bonds the magnet pieces 31 together.

DESCRIPTION OF SYMBOLS 10 Stator 11 Stator core 12 Coil 13 Slot 20 Rotor 21 Rotor core 22 Slot 23 Rotating shaft 30 Field pole magnet 31 Magnet piece 40 Adhesive 50 Conductive tab

Claims (9)

A field pole magnet body configured by bonding a plurality of magnet pieces with an adhesive,
A field pole magnet body formed by bonding the plurality of magnet pieces with an electrolytic adhesive resin material. The field pole magnet body according to claim 1,
An electrode is disposed between the magnet pieces of the plurality of magnet pieces,
The field pole magnet body, wherein the electrode is fixed to a magnet piece forming a space between the magnet pieces among the plurality of magnet pieces using an electrolytic adhesive resin material. The field pole magnet body according to claim 1 or 2,
A field pole magnet body, wherein the field pole magnet body is further subjected to a surface treatment using a conductive material. A rotor core in which the field pole magnet body according to any one of claims 1 to 3 is disposed in a magnet insertion hole,
The rotor core, wherein the field pole magnet body is fixed to the magnet insertion hole by an electrolytic adhesive resin material. The rotor core according to claim 4,
An electrode is disposed between the magnet insertion hole and the field pole magnet body,
The rotor core, wherein the electrode is fixed to the field pole magnet body using an electrolytic adhesive resin material. The rotor core according to claim 5,
The electrode protrudes outward in the rotation axis direction from the end surface in the rotation axis direction of the rotor core, and the length of the protruding portion is the diameter of the rotor core from the position where the conductive electrode is provided. A rotor core characterized by being shorter than a distance to a direction outer side end face. The rotor core according to claim 5,
The rotor core protrudes outward in the rotational axis direction from the end surface in the rotational axis direction of the rotor core, and the protruding portion is folded toward the radially inner side of the rotor core. A method of manufacturing a field pole magnet body for manufacturing a field pole magnet body configured by bonding a plurality of magnet pieces with an adhesive,
A method of manufacturing a field pole magnet body constituting the field pole magnet body by combining a plurality of magnet pieces with an electrolytic adhesive resin material. A field pole magnet body disassembling method for disassembling the field pole magnet body according to claim 2,
Connecting an anode terminal to the magnet piece to which the electrode is fixed by an electrolysis adhesive resin material among the plurality of magnet pieces;
Connecting a cathode terminal to the electrode;
And a step of applying a voltage between the anode terminal and the cathode terminal.

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