JP2005278298A - Split core, skewed split laminated core, skewed laminated annular core, split laminated core skew forming apparatus, stator and electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core and a skew forming apparatus for forming a skew in the stator core in a short period of time without use of a large skew forming apparatus so as to reduce rotation nonuniformity of a large electric motor. <P>SOLUTION: The core 1 is used and split into a plurality of segments in the circumferential direction. A cross section of a key 2 has a shape fitted to a slot of the split core 1. The skew is formed by placing and pressing the key 2 to the skew forming apparatus 10 spirally twisted at an angle equal to a skew angle and provided upright. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric motor using a laminated core as a stator and a method of manufacturing the core, and more particularly to a split core thereof.

In order to eliminate the uneven rotation of the electric motor, it has been conventionally performed to skew the core. As a method of adding skew, there is a method of punching a core with a progressive die and rotating and laminating within the die (for example, Patent Document 1).
JP-A-5-56607

However, this method is not very applicable to a small-lot motor because the apparatus becomes large and the cost becomes enormous.
Therefore, a method of adding a skew applicable to a small lot of motors is known. 5 to 7 are diagrams for explaining a conventional skew forming method suitable for a small-lot motor, FIG. 5 is a diagram showing a process of manufacturing a stator core used in the conventional skew forming method, and FIG. 6 is a fixed diagram. It is a figure which shows the process of forming the slot of a child core, (a) shows the core shape after extracting the inner diameter and outer diameter of the core of a steel plate, and (b) shows the state in the middle of slotting the core. , (C) 8 is a view showing the core shape after the slot removal is completed. 7A and 7B are diagrams showing a conventional example of a jig used in the core stacking process, where FIG. 7A is a front view and FIG. 7B is a side view.
In FIG. 5, the annular core 21 of FIG. 6 (1) is obtained by removing the inner and outer diameters of the core from one silicon steel plate in step 11 (hereinafter, S11). In S12, the slot is removed. FIG. 6B shows a state in the middle of slot removal. The slot 22 is formed on the entire circumference by press working while rotating the core 21 using a punching die having one or two slots. FIG. 6 (3) shows a completed core 21 with the slots 22 removed from the entire inner circumference 21.
Returning to FIG. 5, the core stacking is performed while adding a skew in S13. FIG. 7 shows an example of a jig used in the core stacking process. The outer diameter of the 23 mandrels is slightly smaller than the inner diameter of the core. The width of the 24 keys is slightly smaller than the slot width of the core, and the 24 keys are angled with respect to the axis of the mandrel 23 (in other words, twisted in a spiral). Yes. By inserting the core 21 into the jig 23, the core 21 is stacked along the key 24, so that a skew is formed.
Returning to FIG. 5, the outer periphery of the laminated cores stacked in S13 is welded (S14), and a winding is wound between the slot 22 and the adjacent slot 22 to complete the stator (S15). The rotor is inserted into the central space of the stator to complete the motor assembly (S16).

As described above, in the method of skewing with the key based on the inner diameter of the stator core using the conventional jig of FIG. 7, it is necessary for the operator to stack the cores one by one, In the case of the core of a large electric motor, much time and labor were required.
The present invention has been made in view of such problems, and an object of the present invention is to provide a skew forming apparatus capable of realizing the skew of a large-sized electric motor with low cost equipment and a small amount of labor.

In order to solve the above-mentioned problem, the split core invention described in claim 1 is for fitting for merging one core layer into a plurality of circumferentially adjacent cores adjacent to each other in the circumferential direction. The concave and convex portions are formed at both ends in the circumferential direction.
The invention described in claim 2 is the split core according to claim 1, wherein the core is a crimp for stopping misalignment at the time of stacking, and a crimp with an allowable width capable of shifting the angle to some extent in the circumferential direction is formed. It is characterized by.
The skewed divided laminated core according to a third aspect is characterized in that the divided core according to the first or second aspect is laminated by forming the divided cores in the corresponding portions in the circumferential direction of each layer by forming a skew.
According to a fourth aspect of the present invention, there is provided a skewed laminated core according to the fourth aspect, wherein the skewed divided laminated cores are joined together in the circumferential direction at the fitting uneven portions.
According to a fifth aspect of the present invention, in the skewed laminated annular core according to the fourth aspect, welding is performed at each joint.
The invention of a split laminated core skew forming device according to claim 6 is a skew forming device for laminating a plurality of divided cores with a skew, comprising a base plate and a key erected on the base plate. In the skew forming apparatus, the cross section of the key has a shape that fits into the slot of the split core, and the key is erected in a spiral shape that is equal to the skew angle.
The invention according to claim 7 is the split laminated core skew forming apparatus according to claim 6, comprising an inner periphery guide and an outer periphery guide for respectively guiding the inner periphery and the outer periphery of the split core, and the directions of the inner periphery guide and the outer periphery guide The length is at least the width between the circumferential end of the uppermost core of the laminated core and the circumferentially opposite end of the lowermost core.
The invention of the motor stator according to claim 8 is characterized in that the skewed laminated annular core according to claim 5 is used.
The invention according to claim 9 is characterized in that the stator according to claim 6 is used.

With the above configuration, the skew of the stator core of a large motor can be manufactured without using a large facility and without spending a lot of labor, and the motor can be manufactured inexpensively and with good performance. it can.
Further, since the key can be bent in a spiral shape and a smoother skew can be formed, the skew of the split core laminated core can be formed with higher accuracy, and the performance of the electric motor is improved.

Hereinafter, specific examples of the method of the present invention will be described with reference to FIGS.
FIG. 1 is a plan view of a split core used in the skew forming method according to the present invention, FIG. 2 is a plan view of a skew forming apparatus for a split laminated core to which the skew forming method according to the present invention is applied, and FIG. FIG. 4 is a flowchart showing a manufacturing process from the manufacturing of the divided laminated core to the motor assembly according to the present invention.

  In FIG. 1, reference numeral 1 denotes a core divided in the circumferential direction according to the present invention. At both ends in the circumferential direction of the split core 11, a fitting convex portion 11 and a fitting concave portion 12 that are used when the adjacent split cores are combined are formed. Reference numeral 13 denotes a caulking for stopping the misalignment of the divided cores 11 when they are stacked in the vertical direction on the paper surface, and it can be shifted by an angle in the circumferential direction. Can do.

When the divided cores as shown in FIG. 1 are stacked, the skew can be easily applied by using the skew forming apparatus shown in FIGS.
2 and 3, 10 is a divided laminated core skew forming apparatus, 1 is a divided core, 2 is a key, 3 is an outer diameter guide of the core, 4 is an inner diameter guide of the core, 5 is a backing plate, 6 is a base plate, 7 is an upper plate, and 8 is a guide pin.
The key 2 determines the skew angle. The cross section of the key 2 is the same as the slot shape of the split core 1 (14 in FIG. 1), but is slightly smaller than the slot of the split core 1. Therefore, the slot of the split core 1 can be inserted into the key 2.
Further, it is inclined by a skew angle in a direction perpendicular to the core plane.
Guide pins 8 indicate the positioning of the upper plate 7 and the base plate 6 when the laminated core is pushed into the key 2.

Next, the principle of applying a skew when the divided cores 1 are stacked using the skew forming apparatus 10 will be described.
As shown in FIG. 1, the split cores 1 that have been pressed one by one are set on the upper part of the key 2 in FIG. 2, and the upper plate 7 (FIG. 3) is aligned with the guide pins 8 (FIG. 2) to form the base plate 6 (FIG. 2). ), And a force is applied from above the upper plate 7 by a hydraulic device or the like, and the divided core 1 (FIG. 3) is pushed into the key 2 by the contact plate 5 (FIG. 3), and the divided core 1 is skewed and adhered. And fix with the caulking 13 (FIG. 1).
Next, another split core 1 is similarly set on the top of the key 2 in FIG. 2, and the upper plate 7 (FIG. 3) is aligned with the guide pin 8 (FIG. 2) and positioned on the base plate 6 (FIG. 2). A force is applied from above the upper plate 7 by a hydraulic device or the like, and the split core 1 (FIG. 3) is pushed into the key 2 by the contact plate 5 (FIG. 3). It is made to adhere to and is fixed with caulking 13 (FIG. 1).
Hereinafter, by repeating the same, a plurality of divided cores 1, 1,..., 1 can be stacked with a skew, and a skewed divided stacked core is finally obtained.

In the manufacturing process flowchart of FIG. 4, the split core is punched from one silicon steel sheet in S1, and the split core 1 (FIG. 1) is obtained.
When a plurality of the divided cores 1 are stacked, a skew is applied using the skew forming apparatus 10 shown in FIGS. 2 and 3 (S2).
Thereafter, the blocks of the divided laminated core with skew are combined in the circumferential direction with the concave and convex portions for fitting in the circumferential direction, and the seam is welded to form a circular core (S3).
A winding is wound between the slot 14 and the adjacent slot 14 to complete the stator (S14).
The rotor is inserted into the central space of the stator to complete the motor assembly (S5).
By dividing and molding the large core in this way, the skew can be formed in a short time without using a large skew forming apparatus.

  As described above, according to the present invention, since the procedure of forming the skew after dividing the core of the motor is taken, the skew can be easily formed even in a large-sized motor, and an electric motor with little rotation unevenness is completed.

It is a top view of the division | segmentation core used for the skew formation method concerning this invention. It is a top view of the skew formation apparatus of the division | segmentation laminated | stacked core to which the skew formation method which concerns on this invention is applied. It is a side view of the skew formation apparatus of FIG. It is a flowchart which shows the manufacturing process from manufacture of the division | segmentation laminated core which concerns on this invention to motor assembly. It is a flowchart which shows the manufacturing process from manufacture of the stator core used by the conventional skew formation method to motor assembly. It is a figure which shows the slot formation process of the conventional stator core, (a) shows the core shape after extracting the inner diameter and outer diameter of the core of a steel plate, (b) shows the state in the middle of slotting of a core. FIG. 8C is a diagram showing the core shape after the slot removal. It is a figure which shows the prior art example of the skew formation jig | tool used in the process of core stacking, (a) is a front view, (b) is a side view.

Explanation of symbols

1 divided core 2 key 3 guide 4 guide 5 backing plate 6 base plate 7 upper plate 8 guide pin 10 divided laminated core skew forming device 11 fitting convex portion 12 fitting concave portion 13 caulking 21 integral core 22 slot 23 mandrel 24 mandrel key

Claims (9)

  1. A split core comprising a core having a single layer divided into a plurality in the circumferential direction, and concave and convex portions for fitting with the adjacent split cores adjacent to each other in the circumferential direction formed at both ends in the circumferential direction.   2. The split core according to claim 1, wherein the core is a crimp for stopping misalignment at the time of stacking and has a permissible width capable of shifting the angle to some extent in the circumferential direction.   3. A divided laminated core with skew, wherein the divided core according to claim 1 or 2 is laminated by forming a skew between the divided cores corresponding to the circumferential direction of each layer.   4. A skewed laminated annular core comprising the skewed divided laminated cores according to claim 3 joined together in a circumferential direction by a fitting uneven portion.   The laminated annular core with skew according to claim 4, wherein welding is applied to each joint.   A skew forming apparatus for laminating a plurality of divided cores with skew, the skew forming apparatus comprising a base plate and a key erected on the base plate, wherein a cross section of the key is the divided core A split laminated core skew forming apparatus characterized in that the key is inserted into a slot and the key is erected in a spiral shape equal to a skew angle.   The inner periphery guide and the outer periphery guide for guiding the inner periphery and the outer periphery of the split core respectively are provided, and the direction length of the inner periphery guide and the outer periphery guide is at least the circumferential end of the uppermost core of the laminated core and the lowermost core. 7. The divided laminated core skew forming apparatus according to claim 6, wherein the divided laminated core skew forming apparatus has a width between the opposite ends in the circumferential direction.   An electric motor stator using the skewed laminated annular core according to claim 5.   An electric motor using the stator according to claim 6.

Images