JP5929310B2 - Manufacturing method of magnet piece constituting magnetic body for field pole - Google Patents

Description

  The present invention relates to a method of manufacturing a magnet piece constituting a field pole magnet body.

  Conventionally, Patent Document 1 discloses a method of cleaving a permanent magnet, in which grooves are provided in advance in a permanent magnet to be cleaved, and the permanent magnet is cleaved by curving the permanent magnet from the surface opposite to the surface on which the groove is provided. ing.

JP 2009-148201 A

  However, in the above invention, when the position of the groove or the contact position between the upper punch and the permanent magnet is deviated from the planned cutting surface, the crack of the permanent magnet deviates from the planned cutting surface, There is a problem that abnormal cracks occur.

  The present invention has been invented in order to solve such problems, and has an object of cleaving a permanent magnet along a cleaved planned surface.

A method of manufacturing a magnet piece constituting a field pole magnet body according to an aspect of the present invention is a place where a blade presses while applying a plurality of bending stresses to the magnet body by a plurality of blades and a plurality of support portions. A weak part is formed in the opposite magnet body, and the magnet body is cleaved.

  According to this aspect, the magnet body can be cleaved along the planned cleaving surface by providing the fragile portion on the magnet body on the side opposite to the portion pressed by the blade while applying bending stress to the magnet body.

It is a schematic block diagram of the permanent magnet embedding type rotary electric machine using the field pole magnet body of this embodiment. It is a schematic block diagram of the magnetic body for field poles. It is a schematic block diagram which shows the magnet body cleaving apparatus of 1st Embodiment. It is a figure explaining the cleaving method of the magnet body using a 1st embodiment. It is a figure which shows the relationship between the depth of a groove | channel, and the load by a braid | blade. It is a schematic block diagram which shows the magnet body cleaving apparatus of 2nd Embodiment. It is a schematic block diagram which shows the magnet body cleaving apparatus of 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, a field pole magnet body that is disposed in a rotor core of a rotating electrical machine and to which the present embodiment is applied will be described.

  In FIG. 1, an embedded permanent magnet rotating electric machine A (hereinafter simply referred to as “rotating electric machine”) includes an annular stator 10 constituting a part of a casing (not shown), and a cylinder arranged coaxially with the stator 10. And a rotor 20 having a shape. FIG.1 (b) is the schematic of the II cross section of Fig.1 (a).

  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

  The rotor 20 includes a rotor core 21, a rotating shaft 23 that rotates integrally with the rotor core 21, and a plurality of field pole magnet bodies 80. The plurality of field pole magnet bodies 80 are centered on the axis O. The slots 22 are formed at equal angular intervals on the same circumference.

  As shown in FIG. 2, the field pole magnet body 80 housed in the slot 22 of the rotor 20 is divided by cleaving along the width direction the magnet body 30 that is rectangular in plan view in the thickness direction. A plurality of magnet pieces 31 are bonded to each other with a resin 32 at a split cross section to constitute an aggregate of magnet pieces 31 aligned in a row. As the resin 32 used, for example, a resin having a heat resistance of about 200 ° C. is used, and the adjacent magnet pieces 31 are electrically insulated from each other. For this reason, the eddy current generated by the fluctuation of the acting magnetic field is reduced by staying in the individual magnet pieces 31, the heat generation of the field pole magnet body 80 due to the eddy current is suppressed, and irreversible thermal demagnetization is prevented. To do.

  Next, the magnet cleaving apparatus 1 for cleaving the magnet body 30 of the first embodiment will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of the magnet body breaking device 1.

  The magnet body breaking device 1 includes a pair of dies 2, a blade 3, and a cutting grindstone 4.

  The die 2 extends along the width direction of the magnet body 30 and supports the lower side of the magnet body 30. The pair of dies 2 are orthogonal to the width direction of the magnet body 30 and are arranged in parallel along the direction along the magnet body 30, that is, along the longitudinal direction of the magnet body 30. The magnet body 30 is bridged between the pair of dies 2.

  The blade 3 extends along the width direction of the magnet body 30 and is driven in the vertical direction by, for example, a servo press, a mechanical press, a hydraulic press, or the like. In the cross section orthogonal to the width direction of the magnet body 30, the blade 3 becomes thicker as it moves away from the magnet body 30, that is, as it goes upward. The blade 3 descends from above the magnet body 30, contacts the magnet body 30 between the pair of dies 2, and further descends to press the magnet body 30.

  The magnet cleaving device 1 applies bending stress to the magnet body 30 by three-point bending with a pair of dies 2 and blades 3.

  The cutting grindstone 4 is located immediately below the blade 3 and rotates around the axis of the rotating shaft 4a. The cutting grindstone 4 cuts the magnet body 30 from the side opposite to the portion where the blade 3 contacts the magnet body 30 to form a groove that becomes a fragile portion. The cutting grindstone 4 forms a groove in the magnet body 30 on the back side where the blade 3 presses in a state where the magnet body 30 is pressed by the blade 3. The cutting grindstone 4 moves in the vertical direction and changes the depth of the groove provided in the magnet body 30.

  Next, a method for cleaving the magnet body 30 using the magnet body cleaving apparatus 1 will be described in detail with reference to FIG.

  The magnet body cleaving device 1 lowers the blade 3 and applies a predetermined load to the magnet body 30 by the blade 3 and the pair of dies 2 (FIG. 4A). Thereby, bending stress is applied to the magnet body 30 by three-point bending by the blade 3 and the die 2. The predetermined load is a preset load, and is a load that the magnet body 30 does not cleave when only the predetermined load is applied.

  Next, the magnet body cleaving device 1 raises the cutting grindstone 4 and forms grooves in the magnet body 30 by the cutting grindstone 4. The cutting grindstone 4 forms a groove near the center in the width direction of the magnet body 30. The cutting grindstone 4 rises so that the depth of the groove of the magnet body 30 is gradually increased (FIGS. 4B to 4D).

  In the magnet body 30, a groove is formed by the cutting grindstone 4 in a state in which bending stress is applied by the blade 3 and the pair of dies 2. FIG. 5 is a schematic view showing the relationship between the load applied to the magnet body 30 by the blade 3 and the groove depth of the magnet body 30. In FIG. 5, when it becomes above the line which shows the relationship between the load concerning the magnet body 30, and the depth of the groove | channel of the magnet body 30, the magnet body 30 will cleave. That is, when the groove is deepened by the cutting grindstone 4 in a state in which a predetermined load is applied to the magnet body 30 using the blade 3, the portion where the groove is provided becomes weaker than the other portions, and the groove of the magnet body 30. Becomes deeper than a predetermined depth, the magnet body 30 is cleaved (FIG. 4D). In this way, the magnet piece 31 constituting the field pole magnet body 80 is manufactured.

  The effect of this embodiment will be described.

  A bending stress is applied to the magnet body 30 by the blade 3 and the die 2, and a groove is formed in the magnet body 30 on the side opposite to the portion pressed by the blade 3 in the state where the bending stress is applied, and the magnet body 30 is cleaved. Thereby, the magnet body 30 can be cleaved along the planned cleaving surface. Since the position of the cutting grindstone 4 that forms a groove in the magnet body 30 is fixed immediately below the blade 3, the magnet body 30 can be cleaved along the planned cleaving surface.

  The step of forming the groove in the magnet body 30 and the step of cleaving the magnet body 30 can be integrated, the time for cleaving the magnet body 30 can be shortened, and workability can be improved. .

  Since only the grooves necessary for cleaving the magnet body 30 are formed in the magnet body 30 and the magnet body 30 is cleaved, the number of magnet bodies 30 to be cut by forming the grooves is reduced, and the material constituting the magnet body 30 The yield can be improved.

  Next, a second embodiment of the present invention will be described.

  A magnet body breaking apparatus 1 according to this embodiment will be described with reference to FIG.

  The magnet body breaking apparatus 1 includes a plurality of blades 6, a plurality of dies 7, and a plurality of cutting grindstones 8.

  The plurality of blades 6 are juxtaposed in the longitudinal direction of the magnet body 30 and move together in the vertical direction.

  The plurality of cutting grindstones 8 are provided on the rotary shaft 8a extending in the longitudinal direction of the magnet body 30, and move together in the vertical direction. The diameter of each cutting grindstone 8 is the same. The cutting grindstone 8 is arranged to be directly below the blade 3. That is, one cutting grindstone 8 is located immediately below one blade 3.

  The magnet body cleaving apparatus 1 according to the present embodiment lowers the plurality of blades 6 simultaneously with respect to the magnet body 30 and applies the bending stress to the magnet body 30 at a plurality of locations using the plurality of blades 6. A groove is simultaneously formed with respect to 30 by a plurality of cutting grindstones 8.

  The effect of this embodiment will be described.

  By cleaving the magnet body 30 at the same time, the time for cleaving the magnet body 30 can be shortened, and workability can be improved.

  Next, a third embodiment of the present invention will be described.

  A magnet body cleaving apparatus 1 according to this embodiment will be described with reference to FIG.

  As compared with the magnet body cleaving apparatus 1 of the second embodiment, the magnet body cleaving apparatus 1 is different in the cutting grindstone 9. The plurality of cutting wheels 9a to 9d of the present embodiment have different diameters. Therefore, the larger the diameter of the cutting grindstone, the faster the grooves are formed in the magnet body 30, and the groove depth becomes deeper. That is, the cutting body 9a having a larger diameter breaks the magnet body 30 earlier. The diameters of the cutting grindstones 9a to 9d are not limited to those shown in FIG.

  The effect of this embodiment will be described.

  By cleaving the magnet body 30 using the cutting grindstones 9a to 9d having different diameters, the magnet body 30 can be cleaved according to a desired cleaving order, and the magnet pieces after cleaving can be easily transported. .

  It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

  In the third embodiment, the cutting wheels 9a to 9d having different diameters are used. However, different loads may be applied to the magnet body by a plurality of blades, and the magnet body may be cleaved in a desired cleaving order. As shown in FIG. 5, the magnet body is cleaved by the shallow groove as the load by the blade increases. Thereby, the effect similar to 3rd Embodiment can be acquired.

  In 3rd Embodiment, although the order which cleaves the magnet body 30 using the cutting grindstones 9a-9d of a different diameter was changed, a cutting grindstone is each provided in a different axis | shaft, By changing the timing which raises each cutting grindstone, The magnet bodies may be cleaved in the desired cleaving order. Thereby, the effect similar to 3rd Embodiment can be acquired.

  In the said embodiment, although the cutting grindstone was moved to the up-down direction, a cutting grindstone may be moved to the width direction of a magnet body, and a groove | channel may be formed in a magnet body. Further, the cutting grindstone may be reciprocated in the width direction of the magnet body, and the depth of the groove may be increased stepwise by raising the cutting grindstone every time the reciprocating operation is performed. Further, the cutting grindstone may be raised while reciprocating the cutting grindstone in the width direction of the magnet body.

  Moreover, in the said embodiment, although the groove | channel was formed in the magnet body with the cutting grindstone, it is not restricted to this, A weak part is formed by the method by laser beam irradiation, the method by wire cut electric discharge machining, the method of giving an impact, etc. May be.

1 Magnet body breaking device 2, 7 Die (supporting part)
3, 6 Blade 4, 8, 9a to 9d Cutting grindstone 30 Magnet body 80 Magnet body for field pole

Claims (5)

A manufacturing method for cleaving a magnet body and manufacturing a magnet piece constituting a magnetic body for a field pole,
Forming a fragile portion on the magnet body opposite to the portion pressed by the blade while cleaving the magnet body while applying a plurality of bending stresses to the magnet body by a plurality of blades and a plurality of support portions. A method of manufacturing a magnet piece that constitutes a field pole magnet body. While applying said plurality of bending stress in the magnet body by said plurality of blades and the plurality of support portions, the blade and forming simultaneously fragile portion in the magnet body on the side opposite to the portion to be pressed The manufacturing method of the magnet piece which comprises the magnet body for field poles of Claim 1. While applying said plurality of bending stress in the magnet body by said plurality of blades and the plurality of supporting portions, characterized in that the blade of the magnet body on the side opposite to the portion to be pressed to form a fragile portion to fracture order The manufacturing method of the magnet piece which comprises the magnet body for field poles of Claim 1. The fragile portion is a groove formed on the magnet body, while applying a plurality of bending stress in the magnet body by said plurality of blades and the plurality of support portions, opposite to the portion where the blade presses 2. The method of manufacturing a magnet piece constituting a magnetic body for a field pole according to claim 1, wherein the grooves are processed in the magnet body so that the grooves become deeper in the order of cleaving.   The method of manufacturing a magnet piece constituting the field pole magnet body according to any one of claims 1 to 4, wherein the bending stress is increased in the cleaving order.

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