JP2006025552A - Rotating electric machine and manufacturing method of rotor of rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotating electric machine that secures an adhesion area between an adhesive and the external peripheral part of a steel plate, and is improved in the adhesion strength of a magnet by making the adhesive enter the bottom of a V-shaped groove of the external peripheral part of a rotor core. <P>SOLUTION: The rotating electric machine comprises: the rotor core 31 formed with a plurality of the V-shaped grooves β each formed by the facing of fracture faces at a magnet adhered part, by laminating a prescribed number of rotor core pieces 31x so that press-punched fracture faces 31c of the magnet adhesion part 31a and sheared faces 31d are adjacent with each other; and a rotor 30 that is composed of the adhesive 33 applied to the magnet adhesion part and/or a permanent magnet 32, and also applied in the V-shaped groove, and the permanent magnet adhered to the magnet adhesion part via the adhesive. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine and a method for manufacturing a rotor of the rotating electrical machine.

  As a conventional rotating electrical machine, there is an inner rotor type small DC brushless motor having a magnet on the rotor side, and having an inner rotor formed by forming a rotor yoke portion with a laminated rotor core and mounting and fixing the rotor magnet on the outer periphery thereof. . The rotor core is punched at the same time as the stator core and has a plurality of V-shaped notches for stacking. The rotor core is automatically stacked in a press punching die, making it a solid body that is advantageous for handling and assembly. Further, the uneven surface generated when the rotor core is laminated is used to increase the adhesive strength and reliability of the rotor magnet. This is because a wedge-shaped gap (10 to 20 μm optimum for adhesion) is formed in the outer peripheral portion of the press-punched laminated core by breaking the electromagnetic steel sheet and becomes a pool of adhesive (for example, see Patent Document 1).

JP-A-6-261514 (Claims, paragraph [0007], FIGS. 1 to 5)

  However, in the conventional rotating electric machine described above, the stator core and the rotor core use thin electromagnetic steel sheets in order to reduce eddy current loss and iron loss. In addition, an adhesive having a certain degree of viscosity is used so that it does not flow out of the bonded portion during application and bonding. In particular, when the bonding process is automated, automation is difficult when the adhesive flows out. Since the magnetic steel sheet is thin, the wedge-shaped gap around the outer periphery of the rotor core is small, and the viscosity of the adhesive is high, so the adhesive does not penetrate deeply into the wedge-shaped gap, ensuring a sufficient bonding area between the adhesive and the electromagnetic steel sheet. could not.

  This invention is made in view of the above, Comprising: By making an adhesive enter into the back of the wedge-shaped space | gap of the outer periphery of the rotor core (rotor core) which laminated | stacked the steel plate, the adhesive area of an adhesive agent and a steel plate is made. An object of the present invention is to obtain a rotating electrical machine that is secured and further increases the adhesive strength of a magnet.

  In order to solve the above-described problems and achieve the object, the rotating electrical machine of the present invention is configured by laminating a predetermined number of rotor core pieces so that the press punched fracture surfaces and shear surfaces of the magnet bonding portion are adjacent to each other. Is applied to the rotor iron core in which a plurality of V-shaped grooves are formed on the magnet adhesion portion by facing the fracture surfaces, and to the magnet adhesion portion and / or the permanent magnet, and also applied to the V-shape groove. A rotor including the adhesive and the permanent magnet bonded to the magnet bonding portion via the adhesive.

  According to this invention, since the adhesive has penetrated to the back of the V-shaped groove (wedge-shaped gap) of the magnet bonding portion, it is possible to secure the bonding area between the adhesive and the magnet bonding portion.

  According to this invention, there exists an effect that the rotary electric machine with high adhesive strength of a rotor iron core and a permanent magnet can be obtained.

  Embodiments of a rotating electrical machine and a method of manufacturing a rotor of the rotating electrical machine according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a sectional view showing an embodiment of a rotating electrical machine of the present invention, FIG. 2-1 is a view showing a manufacturing process of a rotor core by transfer press, and FIG. 2-2 is a press punching method. FIG. 3 is a view showing the clearance between the press die and the punch, and FIG. 4A is a view showing the shape of the cut surface of the rotor core piece when the clearance is small. FIG. 4-2 is a diagram showing the shape of the cut surface of the rotor core piece when the clearance is large, and FIG. 5 is an enlarged cross-sectional view taken along the line AA in FIG. FIG. 6 is a diagram showing a conventional magnet bonding portion as a comparative example.

  As shown in FIG. 1, the rotating electrical machine motor 100 of the embodiment is generally formed in a cylindrical shape and is supported by a shaft 20 that is accommodated in a frame (not shown) and a shaft 34, and rotates in the stator 20. A cylindrical rotor 30 is included. The stator 20 is formed by laminating electromagnetic steel plates, and a stator core 21 provided with a plurality (12) of teeth portions 21a and slots 21b on an inner peripheral portion thereof, and a stator winding 22 attached to the slot 21b. It consists of.

  The rotor 30 includes a rotor core 31 formed by laminating electromagnetic steel plates, and a plurality (eight) permanent magnets 32 bonded to the magnet bonding portion 31a on the outer peripheral portion of the rotor core 31. . The permanent magnets 32 are arranged so that N poles and S poles are alternately arranged. The stator winding 22 is energized, a rotating magnetic field is formed in the stator 20, and the rotor 30 is rotated around the shaft 34.

  Next, a method for manufacturing the rotor 30 will be described with reference to FIGS. The rotor core 31 is formed by punching a circular rotor core piece 31x from a core material 40 of a magnetic steel sheet formed in a band shape by a transfer press 400, and laminating the rotor core pieces 31x.

  Here, the shape of the outer peripheral cut surface of the rotor core piece 31x by press punching from the core material 40 will be described. In general, when press punching and cutting are performed, the cut surface is divided into a fracture surface formed in the first half of the cutting process and inclined with respect to the material surface, and a shear surface formed in the second half of the cutting process and perpendicular to the material surface. One form of surface is formed. The formation ratio of the fracture surface and the shear plane is determined by the size of the clearance between the upper die (punch) and the lower die (die) shown in FIG.

  When the clearance is small, as shown in FIG. 4A, the cutting surface is cut with a blade and the shear surface (vertical portion) is increased and the cutting accuracy is improved. However, a large stress is applied to the edge of the mold. Occurs and the mold life is shortened. When the clearance is large, the cutting ability by the edge is reduced and the cutting is performed so that it is torn off, and as shown in FIG. 4-2, the fracture surface (inclined portion) is increased and the cutting accuracy is deteriorated. In the press punching process from the core material 40 according to the present embodiment, the clearance is adjusted so that the shearing surface and the fracture surface are almost halved in consideration of both cutting accuracy and die life.

  Next, with reference to FIG. 2A, a punching process and a laminating process of the rotor core piece 31x by the transfer press 400 will be described. The transfer press 400 includes a stage 41 having a punch 44 and a die 45 for punching the magnet adhesive portion 31a of the rotor core piece 31x intermittently from one side of the core material 40, and the magnet adhesive portion 31a on the other side of the core material 40. A punch 42 for punching in an annular manner from the stage 42 and a die 42, and a punch 46 for punching the remaining non-magnet adhering portion 31b of the rotor core piece 31x from the other side of the core material 40 and the punched rotation. And a stage 43 having a die 47 provided with a laminated hole 47a for laminating the core pieces 31x.

  In the stage 41 and the stage 42, the shaft hole 34a is also punched at the same time. Further, on the stage 43, the rotor core 31 may be formed by forming a V-notch for lamination on the rotor core piece 31x, and the lamination integration may be performed, or the lamination integration may be performed in another process.

  A method of stamping and laminating the rotor core pieces 31x from the core material 40 using the transfer press 400 will be described. The band-shaped core material 40 is set on the transfer press 400, and as a first step, the punches 44 and the dies 45 of the stage 41 and the stage 42 are operated, and the magnet bonding portion 31a of the pair of rotor core pieces 31x is moved to the stage. 41 is punched in an intermittent ring from one side of the core material 40 and from the other side of the stage 42.

  As a second step, the core material 40 is fed by one stage, and the portion punched out intermittently from the other side by the stage 42 is positioned on the stage 43. The punch 46 and the die 47 of the stage 43 are actuated to punch out the non-magnet adhering portion 31b of the rotor core piece 31x and drop it into the laminated hole 47a. Subsequently, the core material 40 is fed by one stage, and the portion punched out intermittently from one side by the stage 41 is positioned on the stage 43. Similarly, the punch 46 and the die 47 of the stage 43 are actuated, the non-magnet bonding surface 31b of the other rotor core piece 31x is punched out, dropped into the laminated hole 47a, and the rotor core piece dropped first. Laminate on 31x.

  Hereinafter, as the third step, the first and second steps are repeated, and a predetermined number of rotor core pieces 31x in which at least the magnet adhesive portions 31a are stamped in opposite directions are alternately stacked.

  Next, as a fourth step, the rotor core 31 is formed by integrating a predetermined number of laminated rotor core pieces 31x by forming a lamination V-notch or the like.

  As a fifth step, the adhesive 33 is applied to the magnet bonding portion 31 a and / or the permanent magnet 32 of the integrated rotor core 31, and the permanent magnet 32 is bonded to the magnet bonding portion 31 a via the adhesive 33. . According to this manufacturing method, the first to fourth steps can be automatically performed only by a transfer press.

  In the above, as shown in FIG. 2A, as a first step, the punches 44 and the dies 45 of the stage 41 and the stage 42 are operated, and the magnet adhesion portions 31a of the pair of rotor core pieces 31x are intermittently connected. Although an example of punching in an annular shape has been shown, as a punching method, as shown in FIG. 2B, only two non-magnet bonding portions 31b may be left and other outer peripheral portions may be continuously punched. In this way, it is easy to manufacture punches and dies, and the life is extended.

  Although not shown, circular punching of a predetermined number of rotor core pieces 31x may be performed from the same direction with a simple press, and alternate stacking in the punching direction may be performed manually or by an assembly robot.

  FIG. 5 is an enlarged cross-sectional view taken along the line AA in FIG. 1 and shows a magnet adhesion portion of the present embodiment, and FIG. 6 is a diagram showing a conventional magnet adhesion portion as a comparative example. Since the rotor core 31 is formed by alternately laminating the rotor core pieces 31x in which at least the magnet adhesion portions 31a of the outer peripheral portion are pressed and punched in the opposite directions, the shear surfaces 31d and the fracture surface 31c are adjacent to each other. It becomes a shape.

  And the inclined surface of the torn surface 31c opposes, the opening angle (alpha) of the torn surfaces 31c becomes an obtuse angle, and the several V-shaped groove | channel (beta) whose opening angle (alpha) is an obtuse angle is formed in the magnet adhesion part 31a. For this reason, even if the viscosity of the adhesive is high to some extent, the applied adhesive 33 can enter deeper into the groove (wedge-like gap) than the conventional one shown in FIG. Adhesive area is sufficiently secured, and the adhesive strength is improved. Therefore, the rotary electric machine 100 with high adhesive strength between the rotor core 31 and the permanent magnet 32 can be obtained. In addition, when apply | coating the adhesive agent 33 to the magnet adhesion part 31a, it is good to apply | coat so that the adhesive agent 33 may be pushed inside the V-shaped groove | channel (beta) groove | channel (wedge-like space | gap).

  As described above, the rotating electrical machine according to the present invention is useful as a rotating electrical machine of a type in which a permanent magnet is bonded to the outer periphery of the rotor.

It is sectional drawing which shows embodiment of the rotary electricity of this invention. It is a figure which shows the manufacturing process of the rotor core by a transfer press. It is a figure which shows the other example of the press punching method. It is a figure which shows the die | dye of a press, and the clearance of a punch. It is a figure which shows the shape of the cut surface of a rotor core piece. It is a figure which shows the shape of the cut surface of a rotor core piece. It is an expanded sectional view which follows the AA line of FIG. It is a figure which shows the conventional magnet adhesion part as a comparative example.

Explanation of symbols

30 Rotor 31 Rotor Core 31a Magnet Adhering Portion 31x Rotor Core Piece 32 Permanent Magnet 33 Adhesive α Opening Angle between Broken Surfaces β V-shaped Groove

Claims (3)

By laminating a predetermined number of rotor core pieces so that the press punched fracture surfaces and shear surfaces of the magnet adhesion part are adjacent to each other, a plurality of V-shaped grooves are formed in the magnet adhesion part by facing the fracture surfaces. Rotor core made,
An adhesive applied to the magnet adhesive portion and / or permanent magnet, and also applied to the V-shaped groove;
The permanent magnet bonded to the magnet bonding portion via the adhesive;
An electric rotating machine comprising a rotor made of A first step of pressing and punching at least the magnet adhesion part of the outer peripheral part of the pair of rotor core pieces in a direction opposite to each other from the steel sheet;
A second step of feeding the pair of rotor core pieces together with the steel plate and sequentially dropping into the laminated holes;
Repeating the first and second steps, and a third step of alternately laminating a predetermined number of rotor core pieces in which at least the magnet adhesion portions are stamped in opposite directions; and
A fourth step of forming the rotor core by integrating the laminated rotor core pieces;
A fifth step of applying an adhesive to the magnet adhesion part and / or the permanent magnet, and adhering the permanent magnet to the magnet adhesion part via the adhesive;
A method for manufacturing a rotor of a rotating electrical machine including A first step of punching a predetermined number of rotor core pieces from a steel plate;
A second step of alternately laminating the rotor core pieces so that the punching directions of at least the magnet bonding portion of the outer peripheral portion are opposite to each other;
A third step of forming the rotor core by integrating the laminated rotor core pieces;
A fourth step of applying an adhesive to the magnet adhesion part and / or the permanent magnet, and adhering the permanent magnet to the magnet adhesion part via the adhesive;
A method for manufacturing a rotor of a rotating electrical machine including

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