JP2010233436A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated core and an electromagnetic motor with high core circularity and high capability for motor by allowing a difference in thickness. <P>SOLUTION: The motor is formed by connecting the laminated core manufactured by a punching die to punch materials stacked in order. When an electromagnetic steel belt with a different thickness is used to form the core sheet 33 of the laminated core 14, the laminated core 14 formed by laminating core sheets 33 with tiny protrusions 36 formed at its thinner side is used. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to an electric motor including the laminated core.

The iron core of the electric motor is composed of a laminated core punched out by a progressive laminating die. The electrical steel sheet used for this is manufactured by cold rolling, but the thickness accuracy of the electrical steel strip is determined by the amount of elastic deformation of the rolling roll. In general, there is a difference in the thickness in the direction perpendicular to the rolling direction, and this difference in thickness is very small near the center of the electromagnetic steel strip, but large near both ends. Incidentally, the plate thickness tolerance in the JIS standard is ± 10% of the plate thickness.
The electromagnetic steel strip actually used for the punching die is slit from the base material to the required width. Therefore, a highly accurate laminated core can be produced in the electromagnetic steel strip that has been materialized at the center of the base metal, but the difference in accumulated plate thickness is noticeable in the electromagnetic steel strip that has been materialized at the end. It becomes a laminated core with large thickness deviation and bending. Such poor core accuracy causes cogging torque, noise, and vibration.
As a means for eliminating the influence due to the thickness deviation of the punched material, two types of units in which the direction of the punching shape is arranged in the forward and reverse directions in the material width direction are punched with a progressive feed punch, and at that time, predetermined The die is rotated 180 degrees for each number of sheets, and the two types of units are alternately pulled out to cancel the thickness deviation (see, for example, Patent Document 1).
In addition, as another method, using a device that feeds the progressively laminating die to the side where the thickness of the electromagnetic steel strip with the thickness deviation is large and the side where the thickness is small so as to be adjacent to each other, A material obtained by stacking two sheets is supplied, and two sheets are simultaneously punched and stacked so as to cancel out the thickness deviation (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 9-2106020 JP 2003-189515 A

As a conventional means to eliminate the influence of plate thickness deviation, the laminated core blocks that are discharged from the progressive laminating die and set to a thin stacking thickness are rotated 180 degrees at a later step and stacked to obtain the required stacking thickness. Since this is a method of offsetting the thickness deviation, there is a problem that the alignment accuracy of the core is deteriorated. In addition, there is a problem that productivity is deteriorated because a process of stacking and repressurizing is required.
In addition, the progressive core punching die is rotated 180 degrees each time, and the sheet thickness deviation is offset by alternately pulling out the large and small material thicknesses, so the laminated core accuracy is improved. However, there has been a problem that a complicated mechanism for rotating the punching die by 180 degrees is required. In addition, since the punching die is rotated by 180 degrees, the pressing speed is lowered and the productivity is deteriorated.
In addition, using an apparatus that feeds the progressively laminating die in a state where two sheets of the electromagnetic steel strip with a thickness deviation are adjacent to each other on the large thickness side and the small thickness side, two sheets are stacked. Since the material is supplied and punched at the same time, the two sheets are stacked to cancel the thickness deviation, so the number of punching operations to obtain a predetermined stacking thickness is only 1/2, and the productivity is greatly improved. However, it is necessary to prepare electromagnetic steel strips with opposite thickness deviations, and it is necessary to have a very large material supply device that superimposes two magnetic steel strips and bonds or laser welds them. There was a problem. Moreover, there is a problem in that the core accuracy deteriorates when the two stacked materials are removed.
The present invention has been made in view of such problems, and an object of the present invention is to provide a laminated core and an electromagnetic motor having a high roundness of the core and high motor performance by allowing thickness deviation.

In order to solve the above problem, the present invention is configured as follows.
The invention according to claim 1 is a motor configured by connecting laminated cores produced by a progressive laminating die, and uses an electromagnetic steel strip having a thickness difference in the core sheet of the laminated core. In the case of forming, a laminated core formed by laminating by providing minute protrusions on the side where the thickness of the core sheet is thin is used.
The invention according to claim 2 is a motor configured by connecting laminated cores produced by a progressive laminating die, using an electromagnetic steel strip having a difference in thickness as a core sheet of the laminated core. When forming, a laminated core formed by laminating the core sheet by providing a caulking portion and providing a minute protrusion and a depression on the thin side of the core sheet and the thick side of the core sheet. It is what was used.
According to a third aspect of the present invention, in the minute protrusion and the recess, the hole diameter of the recess is formed larger than the outer diameter of the protrusion.
According to a fourth aspect of the present invention, the depth of the recess on the side where the core sheet is thin is formed shallower than the depth of the recess on the side where the core sheet is thick. It is.
According to a fifth aspect of the present invention, the height of the protrusion on the side where the core sheet is thin is formed higher than the height of the protrusion on the side where the core sheet is thick. .
According to a sixth aspect of the present invention, in the operation device, the caulking portion is provided between the side on which the core sheet on which the protrusion and the depression are formed is thin and the side on which the core sheet is thick. It is formed.
The invention according to claim 7 is a motor configured by connecting laminated cores produced by a progressive laminating die, using an electromagnetic steel strip having a difference in thickness as a core sheet of the laminated core. When forming, the core sheet is provided with a caulking portion, and is formed by providing a minute protrusion and a depression on either the thin side of the core sheet or the thick side of the core sheet. The laminated core is used.
In the invention according to claim 8, the caulking portion is formed with a minute depression and a minute protrusion.
In a ninth aspect of the present invention, the diameter of the minute depression is smaller than the diameter of the minute protrusion.

According to the invention described in claims 1 to 9, even if the electromagnetic steel strip having a thickness deviation is punched and laminated by using a core sheet provided with minute protrusions and minute depressions, A laminated core that eliminates bending can be obtained, and a laminated core with stable quality can be secured. In an electric motor provided with this laminated core, for example, in the case of a split-type stator core, deformation of the laminated core due to the tension of the winding can be reduced during winding. As a result, high-density winding by aligned winding is possible, and motor characteristics can be improved.
Further, since the deformation of the laminated core is small, the accuracy of the stator can be improved, the cogging torque can be reduced, and the noise and vibration can be reduced.

Sectional drawing of the electric motor which shows 1st Example of this invention The top view of the stator core which shows 1st Example of this invention Sectional view of the stator core showing the first embodiment of the present invention Plane drawing of conventional stator core 2-cutter Configuration diagram of conventional core sheet Cross-sectional view of a conventional laminated core The block diagram of the core sheet which provided the micro processus | protrusion and the micro indentation, and showed the caulking process process which shows 1st Example of this invention The block diagram of the core sheet which provided the micro processus | protrusion and the micro indentation, and showed the crimping | separation separation hole which shows 1st Example of this invention The block diagram of the lamination | stacking core block which provided the micro processus | protrusion and the micro dent, and was fastened by the crimping process process which shows 1st Example of this invention. The block diagram of the core sheet which provided the micro processus | protrusion and the micro indentation, and showed the caulking process process which shows 2nd Example of this invention The block diagram of the lamination | stacking core block which provided the micro processus | protrusion and the micro dent, and was fastened by the crimping process process which shows 2nd Example of this invention. Sectional drawing of a lamination | stacking core block which shows Example 3 of this invention

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

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

FIG. 1 is a sectional view of an electric motor according to the present invention. In the figure, 1 is a rotating shaft, 2 is a rotor core, 3 is a magnet, 4 is a stator core, 5 is an insulator, 6 is a coil, 7 is a frame, 8 is a load side bearing, 9 is a load side bracket, and 10 is an anti-load side bearing. , 11 is an anti-load side bracket, 12 is a connection plate, and 13 is a receptacle. The stator core 4 has a structure in which split-type laminated cores are connected in an annular shape. Further, by providing an encoder (not shown), it can be operated as a servo motor.
FIG. 2 is a plan view of the stator core. Reference numeral 14 denotes a laminated core block. 15 is a caulking projection for fastening, 16 is a joint surface of the yoke portion, and 17 is an inner diameter opening portion. The stator core 4 is composed of twelve laminated core blocks 14.
FIG. 3 is a sectional view of the stator core. 18 is an inner diameter dimension, 19 is an outer diameter dimension, and 20 is a thickness dimension.
In this way, in the stator core configured by connecting the split-type stacked core blocks 14 in an annular shape, the single product accuracy of the stacked core block 14 is, for example, the inner diameter dimension 18 after being connected to the ring and its roundness. This affects the outer diameter dimension 19 and its roundness, the variation in the contact state of the yoke joint surface 16, the variation in the dimension of the inner diameter opening portion 17, the variation in the stacking dimension 20, and the like. In particular, the plate thickness deviation of the core material appears as a core bend and expands to a larger deformation when the winding is applied. These affect the electrical characteristics and cogging torque. That is, as shown in FIG. 4, when two split-type stator cores are taken. 21 is an electromagnetic steel strip, 22 is a material width, 23 is a material feeding direction, 24 is a core sheet A, 25 is a core sheet B, and 26 is a caulking projection. Further, when 27 is the side with the thicker material plate and 28 is the side with the thinner material plate, as shown in FIG. 5, 24 is the core sheet A, 25 is the core sheet B, and 26 is the caulking projection. 27 is a thick plate side, 28 is a thin plate side, and in the laminated state, 29 is a laminated core A and 30 is a laminated core B as shown in FIG. 31 is a bending amount generated in the laminated core A, 32 is a bending amount generated in the laminated core B, and the laminated cores A and B are formed in a bent state. In the case of taking a large number of cores with a progressive laminating die, the core sheet B25 is arranged in the direction opposite to the core sheet A24 as shown in FIG. 4 for the purpose of improving the material yield. In the core sheet A24 and the core sheet B25 of FIG. 5 thus separated from the electromagnetic steel strip, the thick side and the thin side are opposite in the core shape.
A stack of core sheets in such a state is bent in FIG. 6, but the bending occurs in the opposite direction in the laminated core A29 and the laminated core B30. A stator configured with such a laminated core cannot ensure stable accuracy.
In order to solve such a problem, in the present invention, as shown in FIG. 7, a minute projection and a minute depression for eliminating the plate thickness deviation are provided, and the core sheet has a caulking projection. Reference numeral 33 denotes a core sheet having caulking protrusions, 34 is the position of the minute protrusions and minute recesses, 35 is the caulking protrusion, 36 is the minute protrusion, 37 is the outer diameter of the minute protrusion, and 38 is the height of the minute protrusion. Reference numeral 39 denotes a minute recess, 40 denotes a hole diameter of the minute recess, and 41 denotes a depth of the minute recess. Reference numeral 42 denotes a thick side and 43 denotes a thin side.
FIG. 8 is a configuration diagram of a core sheet provided with minute protrusions and minute depressions for eliminating plate thickness deviation and having caulking separation holes. 44 is a core sheet having a caulking separation hole, 34 is a position of a minute protrusion and a minute recess, 45 is a separation hole, 36 is a minute protrusion, 37 is an outer diameter of the minute protrusion, and 38 is a height of the minute protrusion. Reference numeral 39 denotes a minute recess, 40 denotes a hole diameter of the minute recess, and 41 denotes a depth of the minute recess. Reference numeral 42 denotes a thick side and 43 denotes a thin side.
The fine recess hole diameter 40 on the thick plate thickness side 42 is larger than the fine recess hole diameter 40 provided on the thin plate thickness side 43, and the plate thickness retention is larger than the fine recess depth 41 provided on the thin plate thickness side 43. The micro-dent depth 41 on the thick side 42 is deep, and the micro-projection height 38 on the thick side 42 is lower than the micro-projection height 38 provided on the thin side 43.
In the case of the core sheet 33 having caulking protrusions, the protrusion heights are formed in a descending order from the caulking protrusion 35 to the minute protrusion height 38 on the thin plate side 43 and the minute protrusion height 38 on the thick plate side 42. It is what.
By adopting such a configuration, the core sheet to be laminated has the caulking protrusions sufficiently fitted into the core sheet, and the relationship between the micro-dent depth and the micro-projection height on the thin plate thickness side and the thick plate thickness side. The core sheet on the thin plate side has a structure in which the core sheets are separated by a minute amount so that the core sheets are laminated without bending.
A laminated core block having such a laminated structure is shown in FIG. FIG. 9 is a configuration diagram of a laminated core block provided with minute protrusions and minute recesses for eliminating the thickness deviation and fastened by caulking protrusions. Reference numeral 33 denotes a core sheet having caulking projections, 44 denotes a core sheet having caulking separation holes, 35 denotes caulking projections, 36 denotes minute projections, and 39 denotes minute recesses. Reference numeral 46 denotes a dimension from the bottom of the minute recess to the tip of the minute protrusion, 47 denotes a stacking dimension of the laminated core block, and 48 denotes a thickness deviation amount. Reference numeral 49 denotes a gap formed between the core sheets.
Since the core sheet 33 having the caulking protrusions in FIG. 7 and the core sheet 44 having the caulking separation holes in FIG. 8 are provided with four or more minute protrusions 36 and minute recesses 39 provided at the same position and laminated. is there.
At this time, the hole diameter 40 of the minute recess is sufficiently larger than the outer diameter 37 of the minute protrusion, and the radial direction does not interfere when stacked. Further, the height 38 of the minute protrusion at this time is set to about twice the thickness deviation amount generated in the electromagnetic steel strip, and the depth 41 of the minute recess is the minute protrusion on the thicker side as a reference. The same depth as the height 38 is set. That is, the dimension from the bottom surface of the micro-dent to the tip surface of the micro-protrusion is set so as to be the same at every provided location.
When the core sheet 44 having the fine protrusions 36 and the fine depressions 39 set in this way and having the caulking separation holes and the core sheet 33 having the caulking protrusions are fastened and laminated with the caulking protrusions, The tip surface of the microprojection of the core sheet to be stacked next is grounded to the bottom surface of the microrecess, and the core sheet is supported and sequentially laminated by the microrecess and the microrecess. At this time, the side having the larger thickness is in contact and overlapping, but the side having the smaller thickness causes the gap 49 to be generated by the thickness deviation amount. As a result, the thickness deviation and the bending caused by the close contact between the ground plates are miniaturized.

Next, a second embodiment of the laminated core block will be described with reference to FIGS.
A different part from Example 1 is that the micro-dent part on the thin plate side is shared by the caulking part.
As shown in FIG. 10, 33 is a core sheet having caulking protrusions, 34 is a caulking protrusion position having minute protrusions and minute depressions, 36 is a minute protrusion, 37 is an outer diameter of the caulking protrusion, and 38 is a minute protrusion. It is height. Reference numeral 39 denotes a minute recess. Reference numeral 42 denotes a thick side and 43 denotes a thin side. Explaining the configuration of the mold process for minimizing the bending and stacking thickness deviation, by forming a conical minute depression in the previous process of the normal caulking protrusion, the minute protrusion 51 is formed on the opposite side of the plate thickness. Put out. At this time, it becomes slightly larger than the outer diameter 40 of the fine protrusion. The height 38 of the microprojections at this time is set to about several times the plate thickness deviation amount generated in the electromagnetic steel strip, and then the core sheet plate thickness is sandwiched with a certain gap, thereby The plate thickness 50 before caulking and forming the plate thickness is shown. Thereafter, a normal caulking projection 26 is formed.
In the structure of the fastened laminated core block shown in FIG. 11, 33 is a core sheet having caulking protrusions, 44 is a core sheet having caulking separation holes, 35 is caulking protrusions, 36 is minute protrusions, and 39 is minute depressions. Part. Reference numeral 46 denotes a dimension from the bottom of the minute recess to the tip of the minute protrusion, 47 denotes a stacking dimension of the laminated core block, and 48 denotes a thickness deviation amount. Reference numeral 49 denotes a gap formed between the core sheets.
When the core sheet 44 having the fine protrusions 36 and the fine depressions 39 set in this way and having the caulking separation holes and the core sheet 33 having the caulking protrusions are fastened and laminated with the caulking protrusions, The tip surface of the microprojection of the core sheet to be stacked next is grounded to the bottom surface of the microrecess, and the core sheet is supported and sequentially laminated by the microrecess and the microrecess. At this time, the side where the plate thickness is thick contacts and overlaps, but on the side where the plate thickness is thin, the gap 49 is generated by the amount of the plate thickness deviation. As a result, the thickness deviation and the bending caused by the close contact between the ground plates are miniaturized.

Next, a third embodiment of the laminated core block will be described with reference to FIG.
A different part from Example 1 is that the burrs are formed on the thin side and the height is adjusted.
The punching 53 formed at the time of punching the motor core as shown in FIG. 12 is used to absorb the plate thickness deviation and ensure good stacking accuracy. Usually, the punched motor core has burrs and sagging depending on the punching direction. If the clearance is constant, burrs and sagging are constant along the shape of the motor core. Since the height of the burrs is mainly determined by the clearance, the clearance of the thin portion of the punched material is changed on a mold that is possible in terms of product characteristics, and a stacked state as shown in FIG.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Rotor core 3 Magnet 4 Stator core 5 Insulator 6 Coil 7 Frame 8 Load side bearing 9 Load side bracket 10 Anti load side bearing 11 Anti load side bracket 12 Connection board 13 Receptacle 14 Laminated core block 15 Caulking protrusion 16 For fastening Joint surface 17 Inner diameter opening portion 18 Inner diameter dimension 19 Outer diameter dimension 20 Stack thickness dimension 21 Electromagnetic steel strip 22 Material width 23 Material feed direction 24 Core sheet A
25 Core sheet B
26 Caulking projection 27 Thick side 28 Thick side 29 Laminated core A
30 laminated core B
31 Bending amount generated in the laminated core A 32 Bending amount generated in the laminated core B 33 Core sheet 34 having caulking protrusions 35 Positions of the minute protrusions and the minute recesses 35 Caulking protrusions 36 Minute protrusions 37 Minute protrusion outer diameters 38 Minute protrusion heights 39 Microrecess 40 Microrecess hole diameter 41 Microrecess depth 42 Thick platen side 43 Thin platen side 44 Core sheet 45 with caulking separation hole Separation hole 46 Size 47 from microrecess bottom to microprojection tip Lamination Core block stacking dimension 48 Thickness deviation 49 Clearance created between core sheets

Claims (9)

A motor configured by connecting stacked cores produced by a progressive stacking die,
When the core sheet of the laminated core is formed using an electromagnetic steel strip having a difference in thickness, a laminated core formed by laminating the core sheet by providing a minute protrusion on the thin side is used. A motor characterized by that. A motor configured by connecting stacked cores produced by a progressive stacking die,
When the core sheet of the laminated core is formed using an electromagnetic steel strip having a difference in thickness, the core sheet is provided with a caulking portion, and the core sheet has a thin side and the core sheet has a thickness of A motor using a laminated core formed by laminating a thin protrusion and a recess on a thick side.   3. The motor according to claim 2, wherein a hole diameter of the recess is larger than an outer diameter of the protrusion in the minute protrusion and the recess.   The depth of the said hollow part by the side where the thickness of the said core sheet is thin is formed shallower than the depth of the said hollow part by the side where the thickness of the said core sheet is thick. motor.   3. The motor according to claim 2, wherein a height of the protrusion on a side where the core sheet is thin is formed higher than a height of the protrusion on a side where the core sheet is thick.   The said caulking part is formed between the side where the thickness of the said core sheet in which the said protrusion and the said hollow part were formed is thin, and the side where the thickness of the said core sheet is thick, The Claim 2 characterized by the above-mentioned. motor. A motor configured by connecting stacked cores produced by a progressive stacking die,
When the core sheet of the laminated core is formed using electromagnetic steel strips having different thicknesses, the core sheet is provided with a caulking portion, and the thickness of the core sheet is small or the thickness of the core sheet is A motor using a laminated core formed by laminating a thin protrusion and a depression on either one of the thick sides.   The motor according to claim 7, wherein the caulking portion is formed with a minute recess and a minute protrusion.   The motor according to claim 7, wherein a diameter of the minute depression is smaller than a diameter of the minute protrusion.

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