KR20170014426A

KR20170014426A - Method of manufacturing a motor core

Info

Publication number: KR20170014426A
Application number: KR1020150107793A
Authority: KR
Inventors: 김기식
Original assignee: 김기식
Priority date: 2015-07-30
Filing date: 2015-07-30
Publication date: 2017-02-08

Abstract

The present invention relates to a method for manufacturing a motor core. Disclosed is the method for manufacturing a motor core, the method comprising the steps of: forming a central shaft hole and a plurality of rotor slots radially arranged around the shaft hole by punching the shaft hole and the rotor slots through a steel sheet; producing a rotor plate by blanking the steel sheet in such a manner that the shaft hole and the rotor slots are included; forming a plurality of stator slots radially arranged around an opening, formed through the steel sheet when the rotor plate has been produced, by punching the stator slots through the steel sheet; and producing a stator plate by blanking the steel sheet in such a manner that the stator slots are included; wherein each of the steps comprises the operations of: disposing the steel sheet between a lower mold, including a lower die and a lower punch, and an upper mold including an upper die and an upper punch; pressing the steel sheet by lowering the upper mold; forming a recessed groove in a bottom surface of the steel sheet by pressing the steel sheet by using the lower punch; and perforating the steel sheet along the recessed groove by using the upper punch. According to the method for manufacturing a motor core, burrs generated through the perforation operations of the steel sheet cannot be higher than a level of a surface of each of the plates due to the recessed grooves, and thus the plates can be tightly stacked when a core is manufactured, thereby providing an effect in which a loss of power attributable to magnetic leakage flux can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a core for a motor, and more particularly, to a method of manufacturing a core for a motor in which each plate constituting a core for a motor can be closely stacked without gaps.

As a technology relating to a method of manufacturing a core for a motor, a mold apparatus for manufacturing a motor core and a method for manufacturing a core for a motor using the same are disclosed in Korean Patent Registration No. 10-1481763 (hereinafter referred to as "prior art""Is presented.

The prior art

"A slot forming step for a stator for collectively forming a plurality of slots for a stator having an equal interval on a concentric circle on a horizontally conveyed material;

A plurality of slots for a rotor concentrically formed with the slots for each stator are formed at an inner portion of a portion where the slots for each stator of the material are formed, and a shaft hole is formed at a central portion of the slots Forming a slot for the rotor;

A rotor core is manufactured by blanking a portion where slots for each rotor are formed from the material, and the rotor core is downwardly separated and discharged, and the remaining portions except for a part of the slot for each stator are blanked from the material, A blanking step for causing the core to be manufactured;

And a cutting step of cutting off the residual connection portions between the material and the stator core to separate them from each other.

The stator core and the rotor core are sequentially formed on the same material and then discharged in a batch by continuous operation, and in particular, a technique for improving the precision of a product by allowing each slot to be formed while having the same center to be.

However, according to the mold and the manufacturing method of the prior art, burrs are formed in the cut portions during each step. The burrs are formed by stacking a plurality of unit cores in a plate form, A minute gap is formed between the unit cores at the same time, which causes a power loss due to a leakage flux.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

And it is an object of the present invention to provide a manufacturing method of a core for a motor which can reduce a power loss by eliminating a problem that a gap is formed between burrs between respective plates constituting a core.

According to an aspect of the present invention, there is provided a method of manufacturing a core for a motor,

Punching a steel sheet to form a shaft hole at the center and a plurality of rotor slots arranged radially about the shaft hole;

Forming the rotor plate by blanking the steel plate to include the shaft hole and the rotor slots;

Punching the steel plate to form a plurality of stator slots radially arranged around the opening formed in the steel plate by the manufacture of the rotor plate; And

Forming a stator plate by blanking the steel sheet so as to include each of the stator slots,

Each of the steps

A step of injecting the steel sheet between a lower mold including a lower die and a lower punch, and an upper mold including an upper die and an upper punch;

Lowering the upper mold to press the steel sheet;

Pressing the steel plate with the lower punch to form a concave groove on the lower surface of the steel plate; And

And punching the steel plate along the concave groove with the upper punch.

According to the method for manufacturing a core for a motor according to the present invention,

The burrs generated in the steel sheet punching process can not be over the surfaces of the respective plates due to the recessed grooves, so that the plates can be closely stacked when the core is manufactured, thereby reducing the power loss due to the leakage flux .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view schematically showing a punching die used in a method for manufacturing a core for a motor according to an embodiment of the present invention; FIG.
FIG. 2 is a planar view of each component shown in FIG. 1 according to an embodiment of the present invention; FIG.
FIGS. 3 to 6 are cross-sectional structural views showing steps in a method of manufacturing a core for a motor according to an embodiment of the present invention. FIG.
7 is a flowchart of a method of manufacturing a core for a motor according to an embodiment of the present invention.

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

As shown in FIGS. 1 to 7, in the method for manufacturing a core for a motor according to an embodiment of the present invention,

Punching a steel plate 100 to form a shaft hole 210 at a center and forming a plurality of rotor slots 220 radially arranged around the shaft hole 210;

A step S20 of blanking the steel plate 100 so as to include the shaft hole 210 and the rotor slots 220 to manufacture a rotor core plate 200 (hereinafter referred to as a rotor plate) ;

A step S30 of forming a plurality of stator slots 310 radially arranged around the opening 110 formed in the steel plate 100 by manufacturing the rotor plate 200 by punching the steel plate 100; And

(S40) of manufacturing a stator core plate 300 (hereinafter, referred to as 'stator plate') by blanking the steel plate 100 to include the stator slots 310,

The above steps S10, S20, S30 and S40 include a steel sheet pouring step P10, a steel sheet pressing step P20, a groove forming step P30, and a steel sheet pouring step P40. .

The steps S10, S20, S30, and S40 and the steps P10, P20, P30, and P40 are performed by one punching die,

As shown in FIG. 1 and FIG. 2,

A lower mold 400 including a lower die 410 and a lower punch 420; And

And an upper die 500 including an upper die 510 and an upper punch 520.

The lower punch 420 includes a lower punch 420a for a shaft hole, a lower punch 420b for a plurality of rotor slots arranged radially around the lower punch 420a for the shaft hole, A lower punch 420c for a rotor plate disposed at the rear, a plurality of lower punches 420d for a plurality of stator slots disposed at the rear of the lower punch 420c for the rotor plate and arranged radially, And a lower punch 420e for a stator plate disposed at the rear of the stator plate 420d,

The upper punch 520 includes an upper punch 520a for a shaft hole, a plurality of upper punch 520b for rotor slots arranged radially around the upper punch 520a for the shaft hole, A plurality of upper punches 520d for the stator slots disposed radially behind the upper punch 520c for the rotor plate and a plurality of upper punches 520d for the stator slots for the stator slots, And upper punch 520e for a stator plate disposed at the rear of the lower punch 420a and 520d.

Accordingly, the steps S10, S20, S30, and S40 sequentially move the steel plate 100 by repeating the process of feeding the steel plate 100 by a predetermined pitch, The stator 200 and the stator plate 300 may be fabricated together.

Meanwhile, in the manufacturing method of the present invention, each of the steps S10, S20, S30, and S40 is performed in the steel sheet input step P10, the steel sheet pressing step P20, the grooved hole forming step P30, P40).

Referring to each of the processes P10, P20, P30 and P40 with reference mainly to FIGS. 3 to 6,

The steel sheet inserting step P10 is a step of inserting the steel sheet 100 between the lower mold 400 and the upper mold 500 as shown in FIG.

In this process, the steel sheet 100 is fed by a constant pitch every step S10, S20, S30, and S40 as described above.

The steel sheet pressing step P2 is a step of lowering the upper mold 500 and pressing the steel sheet 100 as shown in FIG.

That is, in this process, the upper mold 500 is lowered to press the steel plate 100 such that the lower surface and the upper surface of the steel plate 100 are in contact with the lower die 410 and the upper die 510, respectively.

The grooved hole forming step P30 is a step of pressing the steel sheet 100 with the lower punch 420 to form the concave groove 120 on the lower surface of the steel sheet 100 as shown in FIG.

That is, in this step, the lower punch 420 rises to press-deform the lower surface of the steel plate 100, thereby forming the concave groove 120. The upper die 510 and the upper punch 520 support the steel plate 100 such that the upper surface of the steel plate 100 is not deformed when the lower punch 420 is lifted to form the concave groove 120 .

The grooves 120 are preferably formed to have a thickness of about 5 to 30% with respect to the thickness of the steel plate 100.

The concave grooves 120 may be formed by pressing the entire space facing the lower punch 420 at the lower surface of the steel plate 100 as required. The lower punch 420 And is formed to have an annular shape so as to face along the edge of the substrate.

In the former case, when the thickness of the portion separated from the steel plate 100 is changed, when the steel plate 100 is punched as in the rotor slot forming step S10 and the stator slot forming step S30 And the entire upper surface of the lower punch 420 is brought into contact with the steel plate 100 so that a high pressure is required to form the concave groove 120 .

On the other hand, in the latter case, when the steel plate 100 is blanked as in the rotor plate making step S20 and the stator plate making step S40, that is, when the steel plate 100 is blanked And the lower punch 420 is in contact with the steel plate 100 locally so that the concave groove 120 can be easily formed at a low pressure .

As shown in FIGS. 3 and 5, the lower punch 420 is formed with a protruding portion 421 protruding upward along the top edge thereof in order to form the concave groove 120 in an annular shape.

The raised portion 421 and the raised portion 120 formed by the raised portion 421 consider the thickness and mechanical properties of the steel plate 100 and the size of the lower punch 420 and the upper punch 520 A triangular shape, a trapezoidal shape, a semicircular shape, and the like.

The steel plate punching process P40 is a process of punching the steel plate 100 along the concave grooves 120 with the upper punch 520 as shown in FIG.

That is, in this process, the upper punch 520 is lowered and the steel plate 100 is punched along the concave groove 120, so that the steel plate 100 is punched in accordance with the respective steps S10, S20, S30, The shaft hole 210 and the rotor slot 220 or the stator slot 310 are formed or the rotor plate 200 or the stator plate 300 is separated from the steel plate 100. When the upper punch 520 descends to puncture the steel plate 100, the lower punch 420 moves down with the upper punch 520 so that the upper punch 420 can pass through the steel plate 100 do.

The upper punch 520 is formed to have a slightly smaller diameter than the lower punch 420 so that the steel plate 100 can be smoothly punched. In particular, when the concave groove 120 is formed in an annular shape, It is preferable that the steel plate 100 has a diameter such that the cutting plane along the perforations of the steel plate 100 can be located between the outer edge and the inner edge of the recess 120.

As a result, as shown in FIG. 6, a burr 130 generated in the steel sheet punching process P40 is inserted into the recessed groove 120 so that the burr 130 does not protrude beyond the surface of the rotor plate 200 or the stator plate 300 to prevent the rotor plates 200 or the stator plates 300 300 can be closely laminated to each other. Therefore, power loss due to the leakage magnetic flux can be reduced, and a core for a motor having improved energy efficiency can be manufactured.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the above-described embodiments, and variations and modifications may be made without departing from the scope of the present invention. Should be construed as falling within the scope of protection of the present invention.

100: steel plate
110: opening
120: Entry groove
130; Bur
200: Rotor plate
210: shaft hole
220: Rotor slot
300: stator plate
310: stator slot
400: Lower mold
410: Lower die
420: Lower punch
421:
500: upper mold
510: upper die
520: upper punch

Claims

Punching the steel plate 100 to form a shaft hole 210 at the center and a plurality of rotor slots 220 radially arranged around the shaft hole 210;
(S20) of manufacturing the rotor plate (200) by blanking the steel plate (100) so as to include the shaft hole (210) and the rotor slots (220);
A step S30 of forming a plurality of stator slots 310 radially arranged around the opening 110 formed in the steel plate 100 by manufacturing the rotor plate 200 by punching the steel plate 100; And
(S40) of manufacturing the stator plate 300 by blanking the steel plate 100 to include the stator slots 310,
Each of the steps S10, S20, S30, and S40
The steel plate 100 is inserted between the lower mold 400 including the lower die 410 and the lower punch 420 and the upper mold 500 including the upper die 510 and the upper punch 520 Process (P10);
A step (P20) of lowering the upper mold (500) to press the steel plate (100);
A step P30 of pressing the steel plate 100 with the lower punch 420 to form a concave groove 120 on the lower surface of the steel plate 100; And
(P40) of punching the steel plate (100) along the concave groove (120) with the upper punch (520).

The method according to claim 1,
The lower punch 420 is formed with a raised portion 421 protruding upward along the upper edge,
Wherein the concave groove (120) is formed in an annular shape by the protruding portion (421).