JPS62221836A - Structure of iron core for rotary motor - Google Patents

Abstract

PURPOSE:To suppress cogging phenomenon by arranging caulking portions half in number of slots and by posting them equi-distantly to an iron core. CONSTITUTION:A stator core 1 is formed ring-shapedly and a rotor shaft is inserted rotatably inside the core. On the internal surface of the stator core 1, slots 6, into which coils are inserted, are formed at equal intervals in 18 spots between tees. V caulkings are arranged at an equal angular interval of 40 deg. on 9 spots, i.e. half in the number of slots 6. Thus the flux is kept constantly to a predetermined value while a rotor is rotating, so that the cogging torque becomes constant and the cogging phenomenon can be suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an iron core for a stator core, rotating core, etc. of a rotating electric motor, and particularly to an iron core formed by laminating thin iron plates to a predetermined thickness by caulking them together. Regarding structure.

[Conventional technology]

Iron cores used in stator cores of rotating electric machines are generally
A thin iron plate is formed into a ring shape by punching, and a plurality of these thin iron plates are stacked to form a predetermined thickness. During this lamination, a caulking part such as a V caulking is formed on the thin iron plate, and a 1 inch
The thin iron plates are connected to each other by being inlaid. However, when such a caulked portion is formed, the magnetic flux flowing through the iron core is reduced, the balance of the magnetic flux flow is disturbed, and a cogging phenomenon occurs during operation of the rotary motor.

FIG. 6 is a front view of an iron core without a caulked portion applied to the stator core, and FIG. 7 is a front view of the iron core formed with a caulked portion applied to the stator core. In these figures, a stator core 1 is formed into a ring shape, into which a rotating shaft 2 is rotatably inserted. An N-pole magnet 3 d3 and a S-pole magnet 4 are attached to the outer periphery of the rotating shaft 2 . Throwers I to 6, into which coils are inserted, are formed on the inner surface of the stator core 1 at equal intervals between the teeth 5, and by energizing the coils, a magnetic field that rotates the rotating shaft 2 is generated. . In this case, the slots 6 are equally distributed at 18 locations on the same circumference. Further, in FIG. 7, V crimps 7 for assembling the stator core 1 are formed in six equally spaced locations. In each figure, the magnetic flux flows as shown by the broken line, and when the magnetic flux in FIG. 6, where no caulked part is formed, is observed at the boundary e between the N-pole magnet 3 and the S-pole magnet 4, indicated by point A, the N4ai magnet 3 The magnetic flux emitted from the magnet returns to the adjacent S-pole magnet 4 with a 100% probability.

Therefore, the total magnetic flux at all boundaries is φ1+φ2+
φ3+φ4+φ5+φ6-φ. The sum of this magnetic flux is generated by the rotation of the rotating shaft 2 and the magnet 3. Even if /l moves, the same 1lrI(Φ) is maintained at each position, and the magnetic flux is balanced at all positions j rows during the rotation of the rotating shaft 2, and no cogging phenomenon occurs.

[Problem that the invention seeks to solve]

In contrast to the core structure without J and U swage parts, in the case of the core shown in Fig. 7 where V swage 7 is formed, the magnetic flux is large depending on ■ cases where it passes through swage 7 and cases where it does not pass through V swage 7. Gisa becomes W. In addition, depending on the rotation angle of the rotary shaft 2, there may be a portion where the magnetic flux is smaller than other magnetic fluxes, and the cogging torque changes as shown in FIG. 8, resulting in a cogging phenomenon.

An object of the present invention is to provide an iron core structure capable of suppressing the cogging phenomenon when a caulked portion such as a V caulking is formed, thereby allowing smooth driving of a rotating electric motor.

(Means for Solving the Problems) The present invention uniformizes the magnetic flux flowing through the iron core as a whole, and the number of caulked parts for caulking connection is half of the total number of slots, and they are arranged equally. C
There is.

[For production]

The cogging phenomenon decreases when the magnetic flux passes through the caulking part,
If it does not pass through the caulking part, the glue will be small. However, the reduction rate at this caulking part is due to the fact that the caulking part has a constant shape.
If there is a certain amount of force, it is approximately -3 constant (1t1).In the present invention, since the caulked portions are arranged equally, the decrease is uniform throughout the core, and there is no deviation.In addition, the present invention C is formed so that the number of caulked portions is the same as that of the slot, and the number of magnetic fluxes passing through the caulking portion is equal to the number of magnetic fluxes not passing through the caulking portion. Therefore, with the configuration of the present invention, the magnetic flux flowing through the iron core is is made uniform throughout, and the cogging phenomenon is suppressed.

〔Example〕

Hereinafter, embodiments illustrating the present invention will be described in more detail.

First, the amount of magnetic flux in a conventional case where the V-caulking portions 7 are equally distributed at 1/3 r: six locations with respect to 18 slots is calculated. The amount of magnetic flux passing through each tooth 5 of the stator core 1 from the N-pole magnet 3 of the rotating shaft 2 is T, and the amount of magnetic flux passing through the caulking 7 is T/2.The magnetic flux flowing from each tooth 5 is divided into left and right directions. Therefore, in the state shown in FIG. 9, the magnetic fluxes φ, φ2, . φ3. φ4. φ5.
φ6 is as follows.

= 4 − φ −φ2・−φ3−φ4−φ5−φ6 (Clove T/2
)/2 Therefore, the total magnetic flux amount by adding these is (T + T/2
)/2x6=(9/2) ■Howler.

Next, the rotating shaft 2 rotates and moves by one step.
In the state shown in the figure, φ1-φ3-φ5=T+T/2/2=T+T/4φ
-φ4-φ('+ =T+T/2 =T+T/2 Therefore, the total amount of magnetic flux is (33//l)T.

Furthermore, in the state shown in FIG. 11 where the rotating shaft 2 rotates and moves by one step from the state shown in FIG. 10, φ 1− φ
3-φ5 =T-T/2φ2=φ4-・φ
Since 6=1-10T/2/2, the total amount of magnetic flux is (33/4)T. Therefore, the maximum value of magnetic flux ((33
/4)T) The difference from the minimum value ((9/2)T) is (15
/40 degrees, the magnetic flux at each rotational position of the rotating shaft 2 is
Since it changes within this range of (15/4)'r, a cogging phenomenon occurs.

On the other hand, the total amount of magnetic flux is calculated by 4 according to FIG. 1, which is an embodiment of the present invention. In FIG. 1, slots 6 are formed in a stator core 1 in 18 equal parts, and crimps 7 are equally arranged in nine places, which is half of the slots 6, at a separation angle of 40 mm. Calculating the magnetic flux in the same figure, φ −φ3−φs = T + T/2 / 2φ 2−
φ 4 − φ 6 (< T 10/2)/2, and the total amount of magnetic flux is 6T. Next, in the state shown in Fig. 2 where the rotating shaft 2 rotates and the magnet moves by one tooth,
Each magnetic flux is φ1-φ3-φ5 (T + T/2) / 2φ −
Since φ4-φ6=T+T/2/2, the total magnetic flux is 6T. Furthermore, in the state shown in Fig. 3 where the magnet has moved by one tooth, φ1-φ3-φ5=T
+ T/2 / 2φ −φ4−φ6 (T +T/
2) / 2, and the total amount of magnetic flux is 6 teeth. Since the magnetic flux generated by the rotation of the rotating shaft 2 is repeated as described above, the amount of magnetic flux at each position of the rotor 2 is constant at 6 teeth, and as a result, the magnetic flux is always maintained at a constant value during the rotation of the rotor. Therefore, the cogging torque becomes constant, and the cogging phenomenon can be suppressed.

Figures 4 and 5 are front views showing another embodiment of the present invention. These are embodiments used for three-phase motors, and in these figures the stator core 1 has 12 slots 6.
They are evenly distributed in different locations.

Here, the one shown in FIG. 4 has an N-pole magnet 3. One S-pole magnet 4 is attached to each. In such a structure, the V caulking 7, which is equally distributed in half of the slots 6, will eventually become b
It is formed at the root portion of the teeth 7. In addition, in the one shown in Figure 5, two NVM magnets 3 and two S-pole magnets 4 are each mounted on the rotating shaft 2. -6 is formed at the bottom.

In addition, although the above embodiment shows the case where the iron core is applied to the stator core, it can also be applied to the rotor of a DC motor. Further, in the present invention, since the caulking portion does not need to be connected by caulking, it may be a round half-open caulking having a caulking effect similar to a V caulking, or it may be a hole for caulking a bottle.

〔Effect of the invention〕

As described above, according to the present invention, the number of caulked portions is half the number of slots, and the number of caulked portions is equal to the number of slots, and the magnetic flux is made uniform by equally distributing the caulked portions on the iron core, so that the cogging phenomenon can be effectively suppressed.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a front view of one embodiment of the present invention, FIG.
4 and 5 are front views of another embodiment of the present invention. FIG. 6 is a front view of a conventional example in which a caulking portion is not formed. FIG. 7 is a front view of a conventional example in which a caulking portion is not formed. FIG. 8 is a characteristic diagram of cogging torque, and FIGS. 9, 10, and 11 are front views showing the operating state of FIG. 7. 1... Stator core (iron core), 2... Rotating shaft, 3...
・Nff1 magnet, 4...S pole magnet, 5・
...teeth, 6...slot, 7...V caulking (
caulking part).

Claims (1)

[Claims] In an iron core formed by laminating thin iron plates in which a plurality of slots are formed at regular intervals through teeth by caulking, the number of caulked portions for performing the caulking is half of the total number of slots. An iron core structure for a rotating electric motor characterized by being equally spaced.