JP2009044791A - Method of manufacturing laminated core of rotor for reluctance motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated core of a rotor for a reluctance motor, which improves the deterioration of magnetic property in a conventional laminated core of a rotor, thereby increasing efficiency in the reluctance motor. <P>SOLUTION: In the method of manufacturing the laminated core 1 of the rotor for a reluctance motor, which laminates a specified number of core pieces 10, in each of which a plurality of circular arc slits 10s, with the sides of a rotating shaft hole 10a being recessed, are formed coaxially with spacing around the rotating shaft hole, thereby forming a core piece laminated body 10A, and then fills and solidifies resin in the circular arc slits of the core piece laminated body, thereby fixing the specified number of laminated core pieces to each other, the resin is filled and solidified in the circular arc slits of the core piece laminated body, in the state pressing the periphery of the core piece laminated body toward the center in the non-projective direction of pole and generating compressive stress in the non-projective direction of pole in the core piece laminated body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

    The present invention relates to a method for manufacturing a rotor laminated iron core for a reluctance motor, and more specifically, a plurality of arc-shaped slits that are convex on the rotating shaft hole side are formed concentrically, and the plurality of arc-shaped slits are formed on the rotating shaft hole. After a predetermined number of core pieces formed at intervals are stacked to form a core piece laminate, the arc-shaped slits of the core piece laminate are filled and solidified with resin, and a predetermined number of core pieces are stacked. The present invention relates to a method for manufacturing a rotor laminated core for a reluctance motor.

    For example, as drive motors installed in various machine tools, automobiles, etc., replacement of conventional brushed motors with brushless motors is progressing due to demands for improved durability and higher output. As an aspect, in a stator laminated iron core that generates a traveling wave magnetic field by multiphase AC, a rotor laminated iron core having a salient pole type magnetic path rotates in synchronization with the traveling wave magnetic field, that is, a reluctance motor (particularly, Synchronous reluctance motors) have been provided (see, for example, Patent Document 1).

  As shown in FIG. 7, a rotor laminated core (rotor laminated core for a reluctance motor) A in a reluctance motor is formed by laminating a predetermined number of core pieces (rotor core pieces) P, P. Is formed by integrating the rotation shaft hole O in the center, and arcuate slits S, S as flux barriers (magnetic flux barriers) are provided around the rotation shaft hole O. Is formed.

  Here, in the rotor laminated iron core A, a magnetic path in the magnetic salient pole direction and a magnetic path in the non-salient pole direction are formed, so that each iron core piece P, P. A plurality of arc-shaped slits S, S... That are convex are formed concentrically, and the group of arc-shaped slits S, S... Formed concentrically is spaced around the rotation shaft hole O. A plurality of sets are formed.

  Thereby, along the extending direction of the arc-shaped slits S, S..., A magnetic path in the salient pole direction (dd axis) where the magnetic flux easily flows is formed, and the arc-shaped slits S, S. A magnetic path in the non-salient pole direction (qq axis) in which magnetic flux hardly flows is formed along the direction, and the rotor laminated core A is based on the difference in inductance between the salient pole direction and the non-salient pole direction. It will rotate by the reluctance torque which arises.

  Here, in the rotor laminated core A described above, since the arc-shaped slits S, S... Are reduced in resistance to centrifugal force, ribs that divide the arc-shaped slit S are formed to form the rotor laminated core. Although the structure which improves the intensity | strength of this is effective, when the said structure is employ | adopted, since the magnetic flux leaks by the rib which divides | segments the said circular arc-shaped slit S, the fall of the efficiency in a reluctance motor becomes a problem.

  Therefore, a rotor formed by filling individual arc-shaped slits with a bonding resin so as to compensate for the strength reduction of the rotor laminated iron core due to the formation of the arc-shaped slits without forming ribs that divide the arc-shaped slits. A laminated iron core is provided (see, for example, Patent Document 2).

  That is, in the rotor laminated core A ′ shown in FIG. 8, arc-shaped slits S ′, S ′,... Formed around the rotation shaft hole O ′ in the laminated core pieces P ′, P ′,. The core pieces P ′, P ′... Constituting the rotor laminated core A ′ are mutually bonded by the solidified binding resins I ′, I ′... Filled with non-magnetic binding resins I ′, I ′. It is stuck to.

According to the rotor laminated core A ′ having the above configuration, although the arc-shaped slits S ′, S ′,... Are provided, the arc-shaped slits S ′ are filled with the binding resin I ′ and solidified to be rotated. The strength of the child laminated iron core can be greatly improved, and at the same time, it is possible to prevent a decrease in efficiency of the reluctance motor due to leakage of magnetic flux.
JP 2001-258222 A JP 2000-299947 A

    By the way, in the conventional rotor laminated core A ′ described above, in the process of forming the core piece P ′ from the magnetic steel sheet, it is caused by the distortion or the like caused by the punching processing of a large number of arc-shaped slits S ′, S ′. The magnetic properties of the core pieces P ′, P ′,... Constituting the rotor laminated iron core A ′ may be inferior to the magnetic properties of the electromagnetic steel sheet as the base material.

  That is, the reluctance having the magnetic laminated steel core A ′ as a constituent element is not inherited by the core pieces P ′, P ′... Constituting the rotor laminated iron core A ′. There was an inconvenience that caused a reduction in the efficiency of the motor.

  An object of the present invention is to provide a rotor laminated core for a reluctance motor that improves the reduction in magnetic properties seen in the conventional rotor laminated iron core and enables an increase in efficiency in the reluctance motor. It is in providing the manufacturing method of.

    In order to achieve the above object, a method of manufacturing a rotor laminated core for a reluctance motor according to the present invention is formed by concentrically forming a plurality of arc-shaped slits convex on the rotating shaft hole side, and forming a plurality of arc-shaped slits. After a predetermined number of core pieces formed at intervals around the rotation shaft hole are laminated to form an iron core piece laminate, the arc-shaped slit of the iron core piece laminate is filled and solidified with resin, and laminated A plurality of core pieces fixed to each other, and a salient pole direction in which the magnetic flux easily flows along the extending direction of the arc-shaped slit, and a non-salient pole direction in which the magnetic flux hardly flows along the parallel direction of the arc-shaped slit. A method for manufacturing a rotor laminated core for a reluctance motor that is rotated by a reluctance torque generated based on a difference in inductance between the core pieces, pressurizing the outer periphery of the core piece laminate along the non-salient direction toward the center, body In the state that caused the compressive stress along the non-salient direction, it is characterized in that solidified by filling a resin into the circular slit of the core piece laminate.

    According to the method for manufacturing a rotor laminated core for a reluctance motor according to the present invention, a resin is applied to the arc-shaped slit of the core piece laminate in a state where compressive stress is generated along the non-salient direction in the core piece laminate. By filling and solidifying the rotor core for a reluctance motor as a finished product, the state in which compressive stress is applied along the non-salient pole direction is maintained. Since the magnetic flux does not easily flow in the pole direction, the difference in inductance from the salient pole direction increases, and in the state where compressive stress is applied along the non-salient pole direction, the magnetic field between the arc-shaped slits is increased. As the path forming portion tries to bend toward the rotating shaft hole side, tensile stress is generated along the salient pole direction, which further increases the difference in inductance between the non-salient pole direction and the salient pole direction. It is possible to increase the efficiency (motor characteristic) in Kutansumota.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 shows an embodiment of a rotor laminated core for a reluctance motor manufactured according to the manufacturing method according to the present invention.

  The rotor laminated iron core (rotor laminated iron core for reluctance motor) 1 has an iron core laminated body 10A formed by laminating a predetermined number of iron core pieces (rotor iron core pieces) 10, 10... The core pieces 10, 10... Constituting the body 10A are integrated through bonding resins 10i, 10i, which will be described later, and a rotating shaft hole is formed at the center of the core piece laminate 10A. 1O (10a, 10a ...) is open.

  Further, in the rotor laminated core 1, each of the core pieces 10, 10... Constituting the core piece laminated body 10 </ b> A is formed in order to form a magnetic path in the magnetic salient pole direction and a magnetic path in the non-salient pole direction. In addition, a plurality of arc-shaped slits 10s, 10s... Having a convex shape on the rotating shaft hole 10a side are formed concentrically, and the group of arc-shaped slits 10s, 10s. A plurality of groups are formed around the hole 10a at intervals, and in the embodiment, four groups are formed.

  Incidentally, it goes without saying that the arc-shaped slit 10s is not limited to the arc-shaped form formed by the curve shown in the embodiment, but may be an arc shape formed by, for example, a plurality of continuous short straight lines.

  Further, in the rotor laminated iron core 1, the arc-shaped slits 10s, 10s,... Of the iron core pieces 10, 10,. The core pieces 10, 10 ... are fixed to each other by the binding resins 10i, 10i ..., and the rotor laminated core 1 is integrated.

  According to the rotor laminated core 1 having the above-described configuration, a magnetic path in the salient pole direction (dd axis) in which magnetic flux easily flows is formed along the extending direction of the arc-shaped slits 10s, 10s. A magnetic path in the non-salient pole direction (qq axis) in which the magnetic flux does not easily flow is formed along the parallel arrangement direction of the slits 10s, 10s... It will rotate by the reluctance torque which arises based on the difference of the inductance with a polar direction.

Below, the manufacturing method of the rotor lamination | stacking iron core 1 mentioned above is demonstrated in detail later on order of a process.
First, as shown in FIG. 2 (a), a predetermined number of core pieces 10, 10,... Punched from a base material (electromagnetic steel plate) are laminated to form an iron core laminate 10A, and then FIG. ), The core piece laminate 10A is set in the manufacturing apparatus 100.

  Here, the manufacturing apparatus 100 includes a mold apparatus 110 for resin molding, and the mold apparatus 110 includes an upper mold 110U and a lower mold 110L that accommodate the core piece laminate 10A.

  The manufacturing apparatus 100 includes a pressurizing device 120 for pressurizing the core piece laminate 10A. The pressurizer 120 includes a pressurizing block 120B that contacts the outer periphery of the core piece laminate 10A, and the pressurizing block 120B. And an actuator 120A for driving the pressure block 120B.

  Further, as shown in FIG. 3, four pressurizing devices 120 are installed around the set of core piece laminates 10A, and each pressurizing device 120 has a pressurizing block. By the operation of 120B, the core piece laminated body 10A (iron core piece 10) is arranged in a manner capable of pressurizing along the non-salient pole direction (qq axis).

  As shown in FIG. 2B, after the core piece laminate 10A is set in the manufacturing apparatus 100, the pressurizing block 120B is driven as indicated by the arrow C in FIG. The outer periphery of the piece laminate 10A is pressurized in the center direction along the non-salient pole direction (qq axis), and compressive stress along the non-salient pole direction (qq axis) is applied to the core piece laminate 10A. generate.

  Here, as shown in FIG. 5, the pressurizing block 120B of the pressurizing device 120 is driven as indicated by an arrow C, and the outer periphery of the iron core laminate 10A is moved in the center direction along the non-salient pole direction (qq axis). By applying pressure, in the core piece laminated body 10A, more specifically, in each of the iron core pieces 10, 10,..., The magnetic path forming portions 10b, 10b,. A compressive stress along (−q axis) is generated.

  Further, when the outer periphery of the core piece laminated body 10A is pressed in the central direction along the non-salient pole direction (qq axis), an arcuate shape between the arc-shaped slits 10s in each of the core pieces 10, 10. The magnetic path forming portions 10b, 10b,... Are further deformed so as to bend toward the rotary shaft hole 10 (10a), so that the magnetic path forming portions 10b, 10b,. ) Will occur.

  In addition, the applied pressure which generates compressive stress (and tensile stress) with respect to the core piece laminated body 10A is limited to a load that can deform the core piece laminated body 10A (iron core piece 10) in the elastic deformation region. .

  As shown in FIG. 4, in a state where compressive stress along the non-salient pole direction (qq axis) is generated in the core piece laminate 10 </ b> A, molten resin is formed in the cavity of the mold apparatus 110 in the manufacturing apparatus 100. 10I is supplied as indicated by an arrow I, and the arc-shaped slits 10s, 10s,... In each core piece 10 constituting the core piece laminate 10A are filled with molten resin 10I (binding resins 10i, 10i,...).

  After the resin 10I filled in the arc-shaped slits 10s, 10s... Of the core piece laminate 10A is completely solidified, it is taken out from the manufacturing apparatus 100 as shown in FIG. 6 (a), and the iron core as shown in FIG. FIG. 4 is a diagram in which the coupling resins 10i, 10i,... Are inserted into the arc-shaped slits 10s, 10s,... Of the iron core laminate 10A by removing excess resin 10I from the upper surface and the lower surface of the laminate 10. Thus, the rotor laminated core 1 as a product as shown in FIG.

  According to the manufacturing method of the rotor laminated core 1 as described above, in the state where the compressive stress along the non-salient pole direction (q-q axis) is generated in the core piece laminated body 10A, the circle of the core piece laminated body 10A. In the rotor laminated iron core 1 as a finished product, the arc-shaped slits 10s, 10s,... Are filled with the molten resin 10I, and the resin 10I is solidified so that the binding resins 10i, 10i,. The state in which the compressive stress is applied is maintained along the non-salient pole direction (qq axis).

  Thus, since the magnetic flux hardly flows in the non-salient direction (qq axis) where the compressive stress is applied, the difference in inductance from the salient pole direction (dd axis) increases, so that the reluctance motor It is possible to increase the efficiency (motor characteristics).

  Moreover, according to the manufacturing method of the rotor lamination | stacking iron core 1 mentioned above, in order to generate | occur | produce the compressive stress along a non-salient pole direction (qq axis) to the core piece lamination body 10A, the said core piece lamination | stacking body 10A is not made. When pressurizing in the central direction along the salient pole direction (qq axis), as described above, the magnetic path forming portions 10b, 10b,. Tensile stress along the (dd axis) is generated, and in the rotor laminated core 1 as a finished product, the state where the tensile stress is applied along the salient pole direction (dd axis) is maintained. The Rukoto.

  Thus, since the magnetic flux easily flows in the salient pole direction (dd axis) where the tensile stress is applied, the magnetic flux is difficult to flow because the compressive stress is applied (qq axis). The inductance difference between the reluctance motor and the efficiency (motor characteristics) of the reluctance motor can be further increased.

  Moreover, according to the manufacturing method of the rotor lamination | stacking iron core 1 mentioned above, although the arc-shaped slit 10s, 10s ... is formed in the rotor lamination | stacking iron core 1, resin for coupling | bonding to each arc-shaped slit 10s, 10s ... By filling and solidifying 10i, the strength of the rotor laminated core 1 is greatly improved. Thus, the rotor laminated core 1 has excellent motor characteristics and high mechanical strength, and can be rotated at high speed. It will be fully applicable.

  In addition, at the time of manufacturing the rotor laminated core 1 described above, the molten resin 10I is filled in the arc-shaped slits 10s, 10s... Therefore, after pressurizing the iron core laminate 10A first, the arc-shaped slits 10s, 10s,... Are filled with the molten resin 10I, or first, the arc-shaped slits 10s, 10s,. After the molten resin 10I is filled, pressurization on the core piece laminate 10A may be started.

(a) And (b) is an external appearance top view of the rotor lamination | stacking iron core for reluctance motors manufactured by the method in connection with this invention, and principal part sectional side view. (a) And (b) is a notional cross-sectional side view of an iron core piece laminated body, and notional cross-sectional side view of the state which set the iron core piece laminated body in the manufacturing apparatus. The conceptual top view of the core piece laminated body and pressurization apparatus which show the state which set the iron core piece laminated body to the manufacturing apparatus. The conceptual cross-sectional side view which shows the process pressurized while filling the resin material to the core piece laminated body set to the manufacturing apparatus. The conceptual top view which shows the principal part and pressurization apparatus of an iron core piece laminated body in the process pressurized while filling a resin material to an iron core piece laminated body. (a) And (b) is a notional cross-sectional side view which shows the core piece laminated body of the state taken out from the manufacturing apparatus, and a notional cross-section side view which shows the rotor laminated iron core for reluctance motors as a product. (a) And (b) is an external appearance top view and external appearance side view of the conventional rotor lamination | stacking iron core for reluctance motors. (a) And (b) is an external appearance top view and external appearance side view of the conventional rotor lamination | stacking iron core for reluctance motors.

Explanation of symbols

1 ... Rotor laminated core for reluctance motor,
1O ... rotating shaft hole,
10A ... Iron core laminate,
10 ... Iron core piece,
10a ... rotating shaft hole,
10s ... arc-shaped slit,
10i: binding resin,
10I ... resin,
100 ... manufacturing equipment,
110 ... mold apparatus,
120: Pressurizing device.

Claims (1)

A plurality of arc-shaped slits convex on the rotation shaft hole side are formed concentrically, and a predetermined number of core pieces each having the plurality of arc-shaped slits formed at intervals around the rotation shaft hole are laminated. After forming the core piece laminate, the arc-shaped slit of the core piece laminate is filled and solidified with resin, and a predetermined number of the laminated core pieces are fixed to each other, and the arc-shaped slit is extended. Rotation for a reluctance motor that rotates due to a reluctance torque generated based on a difference in inductance between a salient pole direction in which magnetic flux easily flows along the direction and a non-salient pole direction in which magnetic flux does not easily flow along the parallel direction of the arc-shaped slits A method of manufacturing a child laminated core,
In the state where the outer periphery of the core piece laminate is pressurized in the center direction along the non-salient pole direction, and the compressive stress along the non-salience pole direction is generated in the iron core piece laminate, the core piece laminate A rotor laminated core for a reluctance motor, wherein the arc-shaped slit is filled with resin and solidified.

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