JP5994447B2 - Magnet piece manufacturing apparatus constituting field pole magnet body and manufacturing method thereof - Google Patents

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a magnet piece constituting a field pole magnet body disposed in a permanent magnet rotating electrical machine.

  As a field pole magnet body disposed in a rotor core of a permanent magnet embedded rotary electric machine, a plate-like magnet body (hereinafter simply referred to as “magnet body”) is cleaved into a plurality of magnet pieces. A field pole magnet body formed by adhering magnet pieces together is known. Such a field pole magnet body is formed of a plurality of magnet pieces, so that the volume of each magnet piece can be reduced, and the eddy current generated in the magnet piece due to the fluctuation of the magnetic field due to the rotation of the rotor is reduced. be able to. Thereby, the heat generation of the field pole magnet body accompanying the generation of eddy current can be suppressed, and irreversible thermal demagnetization can be prevented.

  In Patent Document 1, a magnet body provided with a cut along a planned cutting line is placed on a die that supports the magnetic body at both ends perpendicular to the planned cutting line, and the upper part of the planned cutting line is punched downward. It is disclosed that a plurality of magnet pieces are manufactured by cutting the magnet body along the planned cutting line.

JP 2009-148201 A

  The magnet pieces cleaved as described above are sandwiched by the conveyance claws from both sides in the width direction of the magnet body, and are conveyed in a direction away from the unbroken magnet body. Here, the magnet body is coated in advance in order to suppress the occurrence or deterioration of rust. The coating is cut along the cut at the time of cutting the magnet body, but the coating remains uncut on the surface on which the cut is not processed.

  As a result, when the magnet body is cleaved along the planned cutting line, only the coating portion is not cut, and may be conveyed to the uncleaved magnet body together with the magnet pieces during conveyance after cleaving. The production facility is temporarily stopped due to a problem.

  The present invention has been made in view of such a technical problem, and provides an apparatus for manufacturing a magnet piece constituting a field pole magnet body that can prevent the coating from being left uncut when the magnet body is cleaved. The purpose is to do.

  According to an aspect of the present invention, there is provided an apparatus for manufacturing a magnet piece that constitutes a magnetic body for a field pole that cleaves a magnet body whose outer surface is coated at a plurality of cleaving sites. The manufacturing apparatus includes: a forming unit that forms a cut in one surface of the magnet body along the planned cutting portion before the magnet body is cut; and one of the magnet bodies along the planned cutting portion before the magnet body is cut. A cutting means for cutting the coating by forming a notch with a depth equal to or greater than the thickness of the coating on the other surface opposite to the surface, and the other surface of the part to be cleaved from the magnet body disposed between the two mounting tables Cleaving means for cleaving the magnet body by pressing.

  According to the said aspect, since it can prevent that a coating remains without being cut | disconnected at the time of the cutting of a magnet body, it can prevent that an uncut magnet body is conveyed together when conveying a magnet piece. Therefore, it is possible to prevent the production facility from being temporarily stopped due to a conveyance failure.

It is a schematic block diagram which shows the structure of the principal part of the permanent magnet type electric motor to which the magnetic body for field poles comprised from the magnet piece manufactured by the manufacturing apparatus in this embodiment is applied. It is sectional drawing which shows the II cross section of the permanent magnet type motor of FIG. 1A. It is a block diagram which shows the structure of the magnet body for field poles. It is a figure explaining the coating of the magnet body. It is a figure explaining groove processing of a magnet body. It is a figure explaining cleaving of a magnet body. It is the figure which showed the mode of laser processing. It is the figure which showed the cleaving process of the manufacturing apparatus of a magnet piece. It is the figure which showed the cleaving process of the manufacturing apparatus of a magnet piece. It is a figure which shows the magnet body in which the cut for cutting and the cut for cutting were formed. It is the figure which showed the process of forming the cut for coating cutting | disconnection. It is the figure which showed the process of forming the cut for coating cutting | disconnection. It is the figure which showed the process of forming the cut for coating cutting | disconnection. It is a figure which shows the manufacturing process of the manufacturing apparatus of a magnet piece.

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

  FIG. 1B showing an II cross section of FIGS. 1A and 1A is a permanent magnet embedded type rotating electrical machine A to which a field pole magnet body 80 composed of a magnet piece manufactured by a manufacturing apparatus in this embodiment is applied ( Hereinafter, it is simply referred to as “rotating electric machine A”.

  The rotating electrical machine A includes an annular stator 10 that constitutes a part of a casing, and a columnar rotor 20 that is disposed 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

  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 accommodated in the slot 22 of the rotor 20 is configured as an aggregate of magnet pieces 31 in which a plurality of magnet pieces 31 are aligned in a line. The magnet piece 31 is manufactured by cleaving a plate-like magnet body 30 (FIG. 3A) having a rectangular upper and lower surface along the short side direction of the rectangle. The field pole magnet body 80 is configured by bonding the divided sections of a plurality of divided magnet pieces 31 with a resin 32. The resin 32 used is, for example, a UV curable adhesive or a two-component room temperature curable adhesive, and electrically insulates adjacent magnet pieces 31 from each other. Thus, eddy currents generated in the magnet pieces 31 due to fluctuations in the acting magnetic field are reduced by being retained in the individual magnet pieces 31, and the heat generation of the field pole magnet body 80 due to the eddy currents is suppressed, which is irreversible. Thermal demagnetization can be prevented.

  Next, a process of manufacturing a plurality of magnet pieces 31 from the plate-like magnet body 30 will be described with reference to FIGS. 3A to 3C.

  The magnet body 30 is formed and sintered, and then machined to form a plate-like magnet body 30. A coating 34 is applied to the outer surface of the magnet body 30 for the purpose of suppressing deterioration such as rust (FIG. 3A).

  Then, the cutting 33 for cutting is formed in the site | part which is going to cut of the magnet body 30 (FIG. 3B). The flatness of the fractured surface 35 when the cleaved cut 33 is cleaved as the magnet piece 31 is improved as the depth from the surface of the cleaved cut 33 provided is increased and the sharpness of the tip of the cleaved cut 33 is increased.

  The cleaving cut 33 is formed by, for example, laser processing. FIG. 4 is a diagram illustrating a state of laser processing when the magnet body 30 is viewed from one side in the longitudinal direction. As shown in FIG. 4, the cleaving cut 33 moves the oscillator 51 for irradiating laser light along the planned cleaving portion of the magnet body 30 in the width direction of the magnet body 30, thereby lowering the lower surface of the magnet body 30 (FIG. 4). Upper surface).

  When the cleaving cut 33 is formed, the coating 34 applied to the surface of the magnet body 30 is also cut at the same time.

  Subsequently, with the cutting notch 33 down, a position corresponding to the cutting notch 33 is pressed downward by a punch to be described later from the side without the cutting notch 33, so that the magnet body 30 becomes the cutting notch 33. It is cut along, forming a plurality of magnet pieces 31 by forming a cut section 35 (FIG. 3C).

  5A and 5B are configuration diagrams illustrating an outline of the magnet piece 31 manufacturing apparatus 100 that performs the cleaving step illustrated in FIG. 3C.

  The manufacturing apparatus 100 of the magnet piece 31 is fixed in a state where the magnet body 30 is bridged between the pair of dies 41 and 42, and the punch 43 is lowered from the upper part to the bridged portion, and the magnet body 30 is bent at three points. It is a device that cleaves. The manufacturing apparatus 100 for the magnet piece 31 includes a pair of dies 41 and 42 as lower molds that bridge and mount the magnet body 30, and a punch that cleaves the magnet body 30 by pushing in a portion where the magnet body 30 is bridged. 43, magnet pressers 44 and 45 which are arranged above the pair of dies 41 and 42 and on both sides of the punch 43 and move in the vertical direction together with the punch 43, and are always arranged by a spring 47a between the pair of dies 41 and 42. A die cushion 47 biased upward.

  The punch 43 cleaves the magnet body 30 by pressing the upper surface of the magnet body 30 spanned between the pair of dies 41 and 42 downward. The punch 43 is positioned so that the tip is positioned in the middle between the pair of dies 41 and 42, and is driven in the vertical direction by, for example, a servo press, a mechanical press, a hydraulic press, or the like.

  The magnet holders 44 and 45 are composed of plate portions 44a and 45a that contact the magnet body 30 and springs 44b and 45b that suspend the plate portions 44a and 45a. The magnet holders 44 and 45 descend as the punch 43 descends, and after the plate portions 44 a and 45 a abut against the magnet body 30, the plate portions 44 a and 45 a are pressed against the magnet body 30 by a spring force. The die cushion 47 descends against the spring force as the punch 43 presses the magnet body 30 downward, and rises by the spring force when the punch 43 returns upward.

  The manufacturing apparatus 100 of the magnet piece 31 is configured as described above, and the magnet body 30 provided with the cutting notches 33 is placed over the upper surfaces of the pair of dies 41 and 42. The magnet body 30 is positioned on the pair of dies 41, 42 so that a desired position to be cleaved, that is, a cleaving cut 33 provided in advance in a cleaving portion is located on the side facing the dies 41, 42. Placed on.

  Then, for example, using a servo mechanism, the magnet body 30 is transported in the transport direction, and the magnet body 30 is aligned so that the cutting notch 33 as the part to be split is positioned between the pair of dies 41 and 42. (FIG. 5A). In this state, when the punch 43 is lowered, the punch 43 presses the back side of the cutting notch 33 downward, and the magnet body 30 is changed to the cutting notch 33 by three-point bending of the punch 43 and the pair of dies 41 and 42. Cleaved along (FIG. 5B).

  By the way, when the magnet body 30 is cleaved, as shown in FIG. 5B, the coating 34 applied to the outer surface of the magnet body 30 may remain without being cut. On the lower surface of the magnet body 30, the coating 34 is also cut when the cleaving cut 33 is formed so that it does not remain. However, there is no cleaving cut 33 on the upper surface of the magnet body 30, and the magnet piece 31 and the uncut cleaved magnet body 30 are hardly separated at the time of cleaving, so that the force for cutting the coating 34 is difficult to act.

  As a result, the cleaved magnet piece 31 and the uncleaved magnet body 30 are connected by the coating 34. In this case, if the cleaved magnet pieces 31 are sandwiched by conveyance claws (not shown) from both sides in the width direction and conveyed in the conveyance direction, the unbroken magnet body 30 is conveyed together with the magnet pieces 31. Thereby, a conveyance defect arises and equipment stops temporarily.

  Therefore, in the present embodiment, before the magnet body 30 is cleaved, the cutting 34 is formed on the upper surface of the magnet body 30 to cut the coating 34 in advance.

  FIG. 6 is a view showing the cutting 33 for cleaving formed in the magnet body 30 before the magnet body 30 is cleaved, and the broken line indicates a planned cleaving portion. As described with reference to FIG. 3B, the cutting 33 for cleaving on the lower surface of the magnet body 30 is formed to smoothly cut the magnet body 30.

  In addition to the cleaving cut 33, a cutting cut 36 for cutting the coating 34 is formed on the upper surface of the magnet body 30 along the planned cutting portion. The depth of the cutting notch 36 is set to such a depth that the coated coating 34 is cut and the base material of the magnet body 30 comes out. That is, the depth of the cutting cut 36 is set deeper than the thickness of the coating 34.

  7A to 7C are diagrams showing a method of forming the cutting notches 36. FIG.

  As shown in FIG. 7A, the cutting notches 36 are formed by laser processing. This laser processing is performed by the same apparatus as that for forming the cleaving cut 33 shown in FIG. That is, the cutting notch 36 is formed on the upper surface of the magnet body 30 by moving the oscillator 61 that irradiates the laser light in the width direction of the magnet body 30 along the planned cutting portion of the magnet body 30. Thereby, the coating 34 existing on the upper surface of the magnet body 30 is cut.

  Further, as shown in FIG. 7B, the cutting notches 36 can be formed by slicing with a rotating grindstone 62. In this case, a cutting notch 36 is formed on the upper surface of the magnet body 30 by moving the rotating grindstone 62 in the width direction of the magnet body 30 while rotating it in the direction indicated by the arrow along the planned cleaving portion of the magnet body 30. At the same time, the coating 34 is cut.

  Further, as shown in FIG. 7C, the cutting cut 36 can be formed by scratching with the needle-like member 63. In this case, the tip of the needle-shaped member 63 is pressed against the part to be cleaved of the magnet body 30, the needle-shaped member 63 is moved in the width direction of the magnet body 30, and the upper surface of the magnet body 30 is scratched. A cutting notch 36 is formed on the upper surface, and the coating 34 is simultaneously cut. The needle-like member 63 is, for example, glass cutting.

  Next, a process example from when the magnet body 30 with the coating 34 is introduced until it is cleaved will be described with reference to FIG. Here, the laser processing shown in FIG. 7A will be described as an example, but the method shown in FIG. 7B or 7C may be used.

  First, a comparative example will be described.

  In the material charging step, the magnet body 30 as a material having the coating 34 on the outer surface is placed at a predetermined position. In the subsequent transport process, the magnet body 30 is transported to a position where laser groove machining is performed. In the laser grooving process, as shown in FIG. 4, a cleaving cut 33 is formed on the lower surface of the magnet body 30. In the subsequent transport process, the magnet body 30 is transported to the dies 41 and 42 of the cleaving device 100. In the cleaving step, the magnet body 30 is cleaved as shown in FIGS. 5A and 5B.

  Next, the process example 1 of this embodiment is demonstrated.

  In the material charging step, the magnet body 30 as a material having the coating 34 on the outer surface is placed at a predetermined position. In the subsequent transport process, the magnet body 30 is transported to a position where the coating cutting process is performed. In the coating cutting process, a cutting notch 36 is formed on the upper surface of the magnet body 30 as shown in FIG. 7A. In the subsequent transport process, the magnet body 30 is transported to a position where laser groove machining is performed. In the laser grooving process, as shown in FIG. 4, a cleaving cut 33 is formed on the lower surface of the magnet body 30. In the subsequent transport process, the magnet body 30 is transported to the dies 41 and 42 of the cleaving device 100. In the cleaving step, the magnet body 30 is cleaved as shown in FIGS. 5A and 5B.

  That is, in Process Example 1, the coating cutting process is performed before the laser groove process.

  Next, process example 2 of the present embodiment will be described.

  The material input process is the same as in Process Example 1. In the subsequent transport process, the magnet body 30 is transported to a position where laser groove machining is performed. The laser grooving process is the same as Process Example 1. In the subsequent transport process, the magnet body 30 is transported to a position where the coating cutting process is performed. The coating cutting process is the same as Process Example 1. In the subsequent transport process, the magnet body 30 is transported to the dies 41 and 42 of the cleaving device 100. The cleaving process is the same as the process example 1.

  That is, in the process example 2, the coating cutting process is performed after the laser groove process is performed.

  Next, process example 3 of the present embodiment will be described.

  The material input process is the same as in Process Example 1. In the subsequent transport process, the magnet body 30 is transported to a position where laser groove machining is performed. In the laser grooving step, as shown in FIG. 4, a cutting notch 33 is formed on the lower surface of the magnet body 30 and a cutting notch 36 is formed on the upper surface of the magnet body 30 as shown in FIG. 7A. . In the subsequent transport process, the magnet body 30 is transported to the dies 41 and 42 of the cleaving device 100. The cleaving process is the same as the process example 1.

  That is, in the process example 3, the coating cutting process is performed in the same process as the laser groove process.

  Next, Process Example 4 of the present embodiment will be described.

  The material input process is the same as in Process Example 1. In the subsequent transporting process, the magnet body 30 is transported to a position where laser grooving is performed, and a cutting notch 36 is formed on the upper surface of the magnet body 30 during the transport. The laser grooving process is the same as Process Example 1. In the subsequent transport process, the magnet body 30 is transported to the dies 41 and 42 of the cleaving device 100. The cleaving process is the same as the process example 1.

  That is, in the process example 4, the coating cutting process is performed during the conveyance before the laser groove processing.

  Next, Process Example 5 of the present embodiment will be described.

  The material input process is the same as in Process Example 1. In the subsequent transport process, the magnet body 30 is transported to a position where laser groove machining is performed. The laser grooving process is the same as Process Example 1. In the subsequent transport process, the magnet body 30 is transported to the dies 41 and 42 of the cleaving device 100, and a cutting notch 36 is formed on the upper surface of the magnet body 30 during the transport. The cleaving process is the same as the process example 1.

  That is, in the process example 5, the coating cutting process is performed during conveyance after the laser groove processing.

  According to the above embodiment, there exist the effects shown below.

  Before the magnet body 30 is cut, the coating 34 is cut by forming a notch deeper than the thickness of the coating 34 on the upper surface of the magnet body 30 along the planned cutting portion, so that the magnet piece 31 and the uncut magnet body 30 after the cutting. Can be prevented from being connected by the coating 34. Therefore, it is possible to prevent the production facility from being temporarily stopped due to the conveyance failure of the magnet piece 31.

  Further, since the coating cutting process is performed before or after the laser grooving process, the coating 34 can be cut between the raw material input and the cleaving, and the production facility is temporarily stopped due to the conveyance failure of the magnet piece 31. Can be prevented.

  Furthermore, since the coating cutting process is performed before or after the laser grooving, it is not necessary to stop the conveyance for the coating cutting process, and the lead time required for manufacturing the magnet piece 31 is increased by that amount. Can be prevented.

  Furthermore, since the laser grooving and the coating cutting process are performed in the same process, the magnet piece 31 can be transported more reliably while using existing equipment without requiring a new space for the coating cutting process. It is possible to prevent the production facility from being temporarily stopped due to a problem.

  Furthermore, since the cutting cut 36 is formed by laser processing, the oscillator 51 used when forming the cutting cut 33 can be shared, and the capital investment newly required for forming the cutting cut 36 can be reduced. can do.

  Further, since the cutting notches 36 are formed by slicing with the rotary grindstone 62, the cutting notches 33 can be formed with less expensive equipment, and the capital investment newly required to form the cutting notches 36 can be increased. Can be reduced.

  Further, since the cutting cut 36 is formed by scratching with the needle-like member 63, the cutting cut 33 can be formed with a further inexpensive equipment, and the capital investment newly required to form the cutting cut 36 Can be reduced.

  The embodiment of the present invention has been described above, but the above embodiment is merely an example of application of the present invention, and is not intended to limit the technical scope of the present invention to the specific configuration of the above embodiment. Various modifications can be made without departing from the spirit of the present invention.

30 Magnet body 31 Magnet piece 33 Notch 34 Coating 36 Notch 41 Die (mounting table)
42 Die (mounting table)
43 Punch (Cleaving means)
51 Oscillator (formation means)
61 Oscillator (cutting means)
80 field pole magnet

Claims (9)

A magnet piece manufacturing apparatus that constitutes a magnetic body for a field pole that cleaves a magnet body that is coated on the outer surface at a plurality of cleaving planned sites,
Forming means for forming a cut on one surface of the magnet body along the planned cutting site before the magnet body is cut;
Prior to cleaving the magnet body, the coating is cut by forming a notch with a depth equal to or greater than the thickness of the coating on the other surface facing the one surface of the magnet body along the planned cleaving portion. Cutting means;
Cleaving means for cleaving the magnet body by pressing the other surface of the part to be cleaved with the magnet body arranged between two mounting tables,
An apparatus for manufacturing a magnet piece constituting a field pole magnet body. A magnet piece manufacturing apparatus constituting the field pole magnet body according to claim 1,
The cutting means cuts the coating prior to the formation of the cut by the forming means;
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. A magnet piece manufacturing apparatus constituting the field pole magnet body according to claim 1,
The cutting means cuts the coating after the formation of the cut by the forming means;
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. An apparatus for manufacturing a magnet piece constituting the field pole magnet body according to claim 2 or 3,
The cutting means cuts the coating during transport for transporting the magnet body to the mounting table.
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. A magnet piece manufacturing apparatus constituting the field pole magnet body according to claim 1,
The cutting means cuts the coating in the same step as the formation of the cut by the forming means;
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. It is a manufacturing apparatus of the magnet piece which constitutes the field pole magnet object according to any one of claims 1 to 5,
The cutting means cuts the coating by laser processing;
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. It is a manufacturing apparatus of the magnet piece which constitutes the field pole magnet object according to any one of claims 1 to 6,
The cutting means cuts the coating by slicing with a rotating grindstone.
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. It is a manufacturing device of the magnet piece which constitutes the field pole magnet object according to any one of claims 1 to 7,
The cutting means cuts the coating by scratching with a needle-like member;
An apparatus for manufacturing a magnet piece that constitutes a field pole magnet body. A method of manufacturing a magnet piece that constitutes a magnetic body for a field pole that cleaves a magnet body that is coated on the outer surface at a plurality of cleaving scheduled sites,
Before cleaving the magnet body, forming a cut on one surface of the magnet body along the cleaved portion;
Prior to cleaving the magnet body, the coating is cut by forming a notch with a depth equal to or greater than the thickness of the coating on the other surface facing the one surface of the magnet body along the planned cleaving portion. Process,
A step of cleaving the magnet body by pressing the other surface of the part to be cleaved, the magnet body disposed between two mounting tables;
The manufacturing method of the magnet piece which comprises the magnet body for field poles characterized by including these.

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