JPH07101980B2 - Method for manufacturing stator core of rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a stator core of a rotating electric machine in which an outer peripheral surface is directly cooled.

[Prior Art] Conventionally, as a rotary electric machine of this type, a stator core punched plate is laminated, and a stator provided with a predetermined winding on a slot provided in an inner peripheral portion of the core punched plate, and a stator The rotor is arranged so as to face the inner peripheral portion, and the permanent magnet is arranged on the rotor.

In many cases, it is used for driving industrial robots or driving machine tools, and there is a strong demand for reduction in size and weight.

Therefore, a frameless structure in which the outer periphery of the stator core is directly cooled by the outside air without using a frame which is an outer structure of a rotating electric machine has a high cooling efficiency and is advantageous in terms of external dimensions.

FIG. 9 is a half sectional view of a conventional rotating electric machine, FIG. 10 is a front view of a stator core blank, and FIG. 11 is a sectional view taken along the line AA of FIG.

9 to 11, (1) is an anti-load side bracket, (2) is a load side bracket, and the bearing portion (2a) of the load side bracket (2) and the anti load side bracket (1) Bearings (3) are mounted on and (1a) to support the rotary shaft (4). Reference numeral (19) denotes a stator, which is sandwiched between the anti-load bracket (1) and the load side bracket (2) and fixed by a bolt (not shown), and the stator coil (6) is attached to the stator (19). It is installed.

(18) is a stator core, which is formed by stacking a plurality of stator core punched plates (7a) provided with cooling projections (7a ') on the outer peripheral surface of a thin electric steel plate that has been pressed. There is.

In FIGS. 10 and 11, (8) is a stator core punched plate (7
The caulking convex portion and the caulking concave portion (9) press-formed in a) are located near the outer circumference of the stator core (18). The stator core (18) is formed by pressure lamination so that the caulking projections (8) of the adjacent stator core blanks (7a) are sequentially fitted into the caulking recesses (9). There is.

Therefore, each stator core punched plate (7a) is integrated by the caulking convex portion (8) and the caulking concave portion (9), and a predetermined number of stator core punched plates (7a) are similarly laminated. It is formed. After that, at both ends of the stator core (18), the anti-load side bracket (1) and the load side bracket (2) shown in FIG.
The mating parts (1b) and (2b) that fit together are cut and provided, and the non-load side bracket (1) and the load side bracket (2) are fitted and sandwiched between these mating parts (1b) and (2b) And fixed by bolts.

Reference numeral (10) is a rotor, and a permanent magnet material such as ferrite, alnico, or rare earth magnet is arranged on the outer periphery of the rotor (10) to form a permanent magnet (11).

However, the rotating electric machine of the above-mentioned embodiment is
8) Fit the anti-load side bracket (1) and the load side bracket (2) to the stator core (18) with the fitting part (1b)
(2b) must be cut and provided, and when the stator core (18) is cut, there is a cooling convex (7a '), so that it is formed between the convexes (7a'). Since it has concave portions, it becomes an intermittent cutting, and it is very difficult to cut the laminated thin plate and the workability is poor.

As another embodiment, as shown in FIG. 12, there is a method in which the stator core (18) is provided with a fitting portion for the anti-load side bracket (1) and the load side bracket (2) without cutting. It was Except for the stator core, it is the same as the rotating electric machine of FIG. 9, so only the stator core (18) will be described.

In the sectional side view of the stator core (18),
As in the above-mentioned conventional case, a) is a plurality of laminated layers. The lamination is carried out by pressure so that the convex portions (8) for caulking of the stator core punched plate (7a) are sequentially fitted into the concave portions (9) for caulking. A disk-shaped end plate member (1) having no cooling projections (7a ') at both ends of the pressure-laminated stator core (18) is provided.
7) Weld the stator core (20) to this end plate member (17)
The outer diameter portion of the is machined to provide the counter load side bracket (1) and the fitting portions (1b) and (2b) with the load side bracket (2) to form the stator core (18). The stator coil (6) is attached to the slot of the stator core (18) thus formed to form the stator (19).

[Problems to be Solved by the Invention] The stator core (18) of the conventional rotating electric machine is
Since the anti-load side bracket (1) and the load side bracket (2) are positioned and fitted on both ends of 8), it is very difficult to cut the laminated thin plate by intermittent cutting and the workability is also poor. In addition, when the end plate member (17) is welded, the number of constituent members also increases, the welding process increases, and thermal distortion occurs due to welding, which causes problems such as thermal deformation of the stator core (18). It was

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a stator core manufacturing method for a rotating electric machine that facilitates positioning and mounting of the load side bracket and the anti-load side bracket. And

[Means for Solving the Problems] A method for manufacturing a stator core of a rotary electric machine according to the present invention is provided with a concavo-convex portion for cooling formed on an outer peripheral surface of a stator core formed by stacking a plurality of stator core blanks. A structure in which a plurality of stator core blanks provided with are stacked, and at least one or more stator core blanks not provided with the cooling uneven portions at both ends of the structure are laminated to form a stator core. And the adjacent stator core blanks that compose the stator core are provided with caulking fitting parts, and the caulking fitting parts are fitted to each other and laminated and fixed to manufacture the stator core. In the method described above, a step of forming at least a fitting portion for caulking, a step of processing by arbitrarily adding or deleting a hole for forming a concavo-convex portion for cooling the stator core, and a stator core outer shape The process of press-fitting the above-mentioned caulking fitting part and stacking and fixing The stator core is manufactured from the process.

[Operation] According to the stator core manufacturing method of the present invention, it is possible to arbitrarily add or delete holes for removing the unevenness portion for cooling the stator core punched plate laminated on both ends of the stator core. According to the steps to be carried out, the stator core is formed by disposing the stator core punched plate having no uneven portion on the outer periphery of the stator core punched plate at both ends of the stator core.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to Figs.

In FIG. 1, only the stator portion is different from the above-mentioned conventional example (FIG. 9), and the description of the other components will be omitted and the stator core portion will be described.

(5) is a stator, which is clamped by the anti-load side bracket (1) and the load side bracket (2) and is a bolt (not shown).
And the stator coil (6) is attached to the stator (5).

(7) is a stator core structure, and this stator core structure (7) is a stator core extraction structure in which a cooling projection (7a ′) is provided on the outer peripheral surface of a thin electric steel plate that is press-pressed. Board (7a)
A circular stator core punching plate (7b) that is configured by stacking a plurality of sheets and has no convex portion (7a ') on the outer peripheral surface at both ends.
Is formed by laminating a plurality of sheets.

2 to 6, (8) is a convex portion for crimping, which is press-formed on the stator core punched plates (7a) and (7b), respectively (9)
The caulking concave portion is formed near the outer circumference of the stator core structure (7). The stator core structure (7) is pressure-laminated so that the caulking projections (8) of the adjacent stator core blanks (7a) and (7b) are sequentially fitted into the caulking recesses (9). Is formed.

Therefore, the stator core blanks (7a) and (7b) are integrated by the caulking convex portion (8) and the caulking concave portion (9),
This constitutes the stator core structure (7) shown in FIG.

The method of fixing the stator core will be described in detail with reference to FIGS. 1 to 6. A stator without the cooling protrusions (7a ′) laminated on both ends of the stator core structure (7). The circular portion (7b ') on the outer periphery of the iron core blank (7b) is fitted to the fitting portion (1b) of the anti-load side bracket (1) and the fitting portion (2b) of the load side bracket (2), respectively. It is sandwiched and fixed by bolts.

Next, an embodiment of a method for manufacturing a stator core of a rotary electric machine according to the present invention will be described with reference to FIGS. 7 and 8.

In the figure, (11) is a strip-shaped steel plate for sequentially punching the stator core, (12) is a strip-shaped steel plate (11) when it is fed in the direction of arrow A in the figure, the strip-shaped steel plate (11) is Pilot hole provided for the removal process of (3), (13) is a slot hole, (14) is the inner diameter of the stator core,
(15) is a cooling protrusion removing hole of the stator core, (9a) is a caulking concave part, (8) is a caulking convex part, and (9) is a caulking concave part which is formed at the same time as the caulking convex part. It becomes a fitting part for. (16) is the outer diameter of the stator core having the cooling convex portion.

Next, the operation will be described. First, the strip-shaped steel plate (11) is positioned in the direction of arrow A in the drawing by the pilot in the pilot hole (12) and is intermittently fed while punching the slot hole (13) and the inner diameter (14) of the stator core. .

Next, the cooling projection removing holes (15) of the stator core are punched. The cooling projection removing holes (15) are cooled on the outer peripheral surface laminated on both ends of the stator core (7). Projection (7a ')
A punch for punching the cooling convex portion removal hole (15) by operating the plate cam (21) shown in FIG. 8 by the drive device only when punching the stator core punching plate (7b) without the Perform punching by moving (22) to the cutting tool allowance. That is, unless the stator core punched plate (7a) having the cooling convex portion (7a ') is provided with the recessed portion (7b'), the stator core punched plate (7b) and the desired number are selected and punched out. However, punching is selectively performed in this step.

Next, the caulking concave portion (9a) is punched out. The caulking concave portion (9a) has the stator core (7) and the caulking convex portion (8a).
When press-fitting and fixing a predetermined number of layers, the following predetermined number of adjacent stator cores (7) are separated from each other. 9a)
Similarly to the punch (21) for punching the cooling convex portion removal hole (15), the punch for punching the caulking concave portion (9a) is
The plate cam (21) is operated only on the stator core punched plate corresponding to the separation surface of the adjacent stator cores (7), and the punching is performed by moving to the punching allowance of the caulking recess (9a).

In the next step, the caulking concave portion (9) and the caulking convex portion (8) are simultaneously formed to form a caulking fitting portion.

In the final step, the outer diameter (16) of the stator core punched plate (7a) is punched, and further, the caulking protrusions (9) are formed in the stator core punched plates (7a) and (7b). (8) is press-fitted to form the stator core (7). Therefore, since the cooling unevenness removing holes (15) are punched in the plurality of sheets laminated on both ends of the stator core (7), the outer diameter (16) is formed in the final step.
After punching, the outer peripheral circular portion (7b ') is formed, and after fixing, the stator core punched plate (7b) is manufactured and laminated and fixed.

The outer diameter of the stator core blanks (7a) and (7b) is the outer diameter of the convex portion (7a ') if the stator core blank has cooling projections (7a), and the stator core plate of the recess In case of (7b), the recess is the outer diameter of the stator core.

Further, the outer circumference (7b ') of the stator core punched plate (7b) for fitting and sandwiching the stator core (7) between the brackets (1) and (2) is
It may be used as it is in the state of being pressed, or may be machined in a laminated state.

In this embodiment, the rotor uses permanent magnets, but the rotor may have a cage structure or the like.

[Advantages of the Invention] As described above, according to the present invention, the stator core of the rotating electric machine of the frameless structure having the convex and concave portions for cooling is formed on the outer peripheral portion of the stator core during a series of stator core manufacturing steps. It is possible to manufacture a stator core punched plate by selecting whether or not cooling convex or concave is necessary or not, and it is possible to manufacture by laminating and fixing with a die, so cutting of extra parts and welding of end plates etc. Is unnecessary, the manufacturing process of the stator core having a frameless structure can be shortened, and the number of constituent members can be reduced, so that a stator core with high product accuracy can be obtained.

[Brief description of drawings]

1 to 8 illustrate one embodiment of the present invention. FIG. 1 is a half sectional view of a rotating electric machine according to one embodiment of the present invention, and FIG. 2 is provided with a cooling convex portion. FIG. 3 is a front view of the stator core punched plate, FIG. 3 is a cross-sectional view of the fixed core punched plate taken along the line BB in FIG. 2, and FIG. 5 is a cross-sectional view of the fixed core punched plate taken along the line C-C in FIG. 4, FIG. 6 is a laminated cross-sectional view of the stator core punched plate, FIG. 7 is a punching process diagram by the core punching die, and FIG. 8 is fixed. 9 to 12 are sectional views showing a punch driving part of a driving device used for press-fitting a caulking convex portion to a caulking concave portion of an iron core blank, and FIGS. 9 to 12 are for explaining a conventional rotating electric machine. Fig. 9 is a half sectional view of a rotating electric machine, Fig. 10 is a half sectional view of a stator core punched plate, Fig. 11 is a sectional view taken along the line AA of Fig. 10, and Fig. 12 is a stator core removed. It is a lamination sectional view of a plate. In the figure, (5) is a stator, (7) is a stator core,
(7a) and (7b) are stator core blanks, (8) is a convex portion for caulking, (9) is a convex portion for caulking, (9a) is a concave portion for caulking for structural separation, and (11) is a strip steel plate, (13) is a slot hole,
(14) is the inner diameter of the stator core, (15) is the cooling projection removing hole, and (16) is the outer diameter of the stator core blank.

Claims (1)

[Claims] Claim: What is claimed is: 1. A main part having a plurality of stator core punched plates provided with cooling irregularities on its outer peripheral surface, and a stator core punched plate not having the cooling irregularities provided at both ends of the main part. To form a stator core, and the adjacent stator core blanks forming this stator core are provided with caulking fitting portions, and the caulking fitting portions are engaged with each other and laminated and fixed. In a method for manufacturing a stator core of a rotating electric machine, a step of forming a fitting portion for caulking, and punching for removing the cooling uneven portion to form a stator core punched plate not provided with the cooling uneven portion. A step of selectively performing machining, a step of removing the outer shape in the shape of the stator core punched plate provided with the cooling uneven portion, and a plurality of the stator cores by press-fitting the caulking fitting part. A stator core of a rotary electric machine, characterized in that Method.