JPS6077646A - Core blank punching method of brushless motor - Google Patents

Abstract

PURPOSE:To effectively utilize a thin steel plate by punching a blank for a balance weight from a thin steel plate surrounded by the outer periphery of a rotor yoke core blank and the inner periphery of a stator core blank. CONSTITUTION:A shaft 6a, a rod-shaped penetrating member 11a and a balance weight clamping hole 13 are first punched from a thin steel strip 15 position via a pilot hole 14, a stator slot 10 is then punched, the outer periphery of a rotor yoke core blank is then punched, and a rotor yoke core blank 3a is then removed. Then, a blank 12a for a balance weight is punched, and removed. Further, the inner periphery of the stator core blank is punched to remove scraps 16, 17, and the outer periphery of the stator core blank is eventually punched to remove a stator core blank 9a. A plurality of blanks 12a are laminated to construct a balance weight.

Description

Detailed Description of the Invention: Manufacture of a brushless motor in which a rotor is driven by power that is sequentially supplied to each phase of an armature winding via a control device such as an input 7<1> depending on the rotational position of the rotor. Regarding the method,
Especially in the manufacturing process of brushless motors that drive loads such as hermetic compressors etc.
This is related to the law of omission.

What is the general configuration of this kind of brushless motor? 1′
It is shown in FIG. 1 in a cross-sectional view. In Fig. 1, 1 is a rotor, and the rotor yoke 3 is shaped like a circle 1 having a predetermined outer diameter.
A plurality of C-shaped permanent magnets 4 made of ferrite or the like are attached to the outer periphery of the permanent magnet 4, and the outer periphery of the permanent magnet 4 is further covered with a reinforcing part 4 (5) made of resin, non-magnetic steel, etc. Reference numeral 2 denotes a stator, which is constructed by attaching an armature winding 8 to a slot h 10 of a stator core 9 having a predetermined inner diameter.A shaft 6 or the like is press-fitted into the inner periphery of the yoke of the rotor 1. The outer periphery of the core of stator 2 is
The rotor 1 and the stator 2 are fixed in a case (not shown) by press-fitting or the like, and the rotor 1 and stator 2 are attached to the outer peripheral surface of the rotor and the inner peripheral surface of the stator.

In addition, in this type of flangeless motor, the magnetic flux in the stator core exhibits an alternating shape, so for the purpose of suppressing overcurrent JJI, the stator core is formed by punching out a blank steel plate. It is constructed by laminating a predetermined number of elemental pieces. Moreover, -1. Note 1i17. Steel plate (from 4, rotor yoke core pieces are punched out in the same manner as the core pieces of general induction motors, etc. are punched out, and a predetermined number of layers are layered to form the rotor yoke. Therefore, inside the rotor yoke made of a laminated body, a rod-shaped penetrating portion 4A indicated by reference numeral 11 in FIG. 1 is provided to penetrate in the axial direction. The maintenance of the laminate is maintained. This rod-shaped penetrating member] 1
is formed by die-casting using a metal such as aluminum or zinc, and at the same time, annular reinforcement parts similar to short-circuit rings in the Kagosugi rotor of an induction motor are formed at both axial ends of the rotor by this die-casting. It is formed integrally with the rod-shaped penetrating member 11, and the rotor &! ! ,! It forms a reinforcing structure for the part.

Generally, it is necessary to attach a balance weight to the above-mentioned annular reinforcing part in order to correct the unbalance of the compression part mechanical element of the hermetic 4+H゛2 compressor. In addition, it is possible to swage the high specific gravity 4 = 4 to the boss for mechanical swaging, or to integrally form the annular catch 41 part A4 and balance weight part J1β by die casting. 1'11 completed.

The general structure of a brushless motor intended for driving a closed-fit 14 compressor has been outlined above, and below, the W characteristics and effects of the present invention will be explained.

In the present invention, the rotor yoke core piece and the stationary r-core piece are respectively punched by punching the outer diameter of the rotor yoke core piece and the inner diameter of the stator core piece in the steel plate A4. 41 approximately crescent-shaped balance weight elements j'', which can be formed into a balance weight by laminating a plurality of elements, are removed from the enclosed donut-shaped portion.In other words, it is clear from FIG. As shown in FIG. It was the scrap department. However, for example, permanent magnet 4
Generally, the radial thickness of the rotor is approximately 20% of the rotor radius, which is a considerable thickness, and the present invention focuses on this point.
This aims to make effective use of the donut-shaped portion.

FIG. 2 is a plan view showing an example of a method for cutting out each piece of the rotor yoke core, stator core, and balance weight in the present invention. In FIG. 2, reference numeral 3a denotes a rotor yoke core element for constructing a rotor yoke (rotor 11), which is formed with a shaft hole 6a and a casting hole 11a of the rod-shaped penetrating portion 4. Further, 9a is a stator core piece having a slot 10, and 12a is a balance weight piece having a caulking hole 13. Each of these pieces is sequentially punched out using a progressive press die by intermittently moving a band-shaped thin steel plate (a) 15 positioned by a pilot hole 14. To explain an example of the punching process, in a row culm, first punch out the shaft hole 6a, the casting hole 11a of the rod-shaped penetration part, and the caulking hole 13 of the balance weight, and then in the second process, the stator slot 10, then in the third step, the outer diameter of the rotor yoke core piece 3a is punched out to remove the rotor yoke core piece 3a, and then the fourth
In the process, the balance weight piece 12a is removed by 4' and removed. In the subsequent fifth step, the inner diameter of the stator core element is punched out to separate the scrap parts 16 and 17,
Finally, in the sixth step, the outer diameter of the stator core element piece 9a is punched out and the stator core element piece 9a is removed, and in the following steps, one rotor yoke t'), the outer diameter of the element piece C and A doughnut-shaped thin steel plate 4 surrounded by the inner diameter of one stator core element.
”, approximately three-mouthed 11β-shaped balance weight piece 1
You can get one.

In the example shown in FIG. 2, the inner circumference of the balance weight piece 12a is punched out to match the outer diameter of the rotor yoke core piece 3a, but the present invention is not limited to this. It is easy to understand from the above explanation that it is possible to set the cedar shape of the piece for the balance weight to 0゛ and punch it as long as it does not interfere with the punching process. be. Further, another piece for the balance way I may be punched out from the scrap portion 17 if necessary.

The balance weight blank pieces punched as described in 1 above are stacked in a number corresponding to the specified weight to form a balance weight (・A2
As shown in FIG.
Install it on A18. As mentioned above, the installation method is as follows.
The caulking boss 19 provided integrally with the annular reinforcing portion 4/A18 by die-casting is inserted into the caulking hole 13 of the balance weight.
It is installed by inserting it through the crimping boss 19 and crimping the tip of the crimping boss 19.

FIG. 4 is a plan view showing another example of the method for cutting out each piece of the rotor yoke core, stator core, and balance weight in the present invention, and is the same or equivalent to that shown in FIG. The same reference numerals are given to the parts and redundant explanations are omitted. The feature of the blanking method shown in FIG. 4 is that the outer diameter of the rotor yoke core piece 3a and the inner diameter of the stator core piece 9a are eccentrically punched. This makes it possible to increase the thickness of the balance weight piece 12b in the radial direction. Therefore, the number of stacked balance weights is reduced for the same burden weight, the axial length of the entire rotor is reduced, and the mounting strength of the balance weight is improved in accordance with the centrifugal force during rotation.

The punching process in the blanking method shown in Figure 4 is the same as the example explained in Figure 2 (the rotor yoke core is cut in accordance with the inner diameter of the stator core element It is only necessary to prepare a punching die in which the outer diameter of the piece is eccentric and a desired balance weight shape is set.

As explained above, the method for punching out a brushless morph core piece according to the present invention is a method for punching out a core piece of a brushless morph, which is a conventional scrap part surrounded by the outer diameter of a rotor yoke core piece and the inner diameter of a stator core piece. This method punches out pieces for balance weights from thin steel plates, which can be laminated to form a balance weight.As a result of effective use of thin steel plates 4A, conventional 4) J fees for balance weights are no longer required. Therefore, the monthly interest cost of the motor is reduced.

Furthermore, since the pieces for the balance weight are punched using the punching die and punching process for each core piece of the rotor yoke and stator, there is no increase in the number of man-hours, and therefore the above Due to the effect of cost reduction, the cost of the motor can be reduced.

In addition, by punching the rotor yoke core piece with the outer diameter of the stator a and the inner diameter of the element piece eccentric to each other, the weight of the balance weight element increases and the stacked thickness of the balance weight can be reduced. , it is possible to improve the attachment strength of the balance weight to the rotating centrifugal nof.

1゛＾Buy The advantage of configuring the balance way 1~ by stacking multiple pieces is that if the compression capacity of the hermetic compressor changes and the amount of annular lance of the compression part mechanical element changes, the balance One advantage is that balance adjustment can be easily achieved simply by increasing or decreasing the number of weight pieces used.

Punched balance way 1 - servant)'1, same ++l
Only the brushless morph is made of the removed rotor yoke and stator iron pieces j゛1! J
”) 1-1 Other motor balance weights)
1j is acceptable. In the present invention, the ratio is q:j.

The surplus of the balance weight user 1"1 that will be used is 1"!
It can be used as a balance way 1 to be installed in other brushless morph or induction motors manufactured for applications such as type 1 compressors, etc. Balance Way l-Kawamoto 11. It is set and punched from the beginning of punching. By utilizing it in this way, the effects of non-invention become even more widespread.

In addition, in addition to punching out the core pieces of the rotor yoke and fixed 1' with eccentricity relative to each other as described above, for example, small (low-output machines) and large-sized (high-output machines) with approximately the same manufacturing tj number can be made. Combining the brushless morph and punching out the rotor yoke iron 70/element) 1 for the Osugi motor from the inner circumferential thin 1IIL plate A4 of the stator core piece for the small J1 motor, the small size is obtained from Tora handling A'A. Remove 41 pieces of rotor material for motors, and find the inner diameter of stator core pieces for large motors with large radial thickness and the inner diameter of stator core pieces for small motors! 1. From the moon, move the thin steel plate surrounded by the outer diameter of the iron element piece of the transmission yoke to the balance way 1-
Methods such as punching out the blank pieces may also be considered.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view showing the general configuration of a flangeless motor, FIGS. 2, U, and 4 are plan views showing different examples of handling according to the present invention, and FIG. FIG. 2 is a perspective view of a rotor of a brushless motor equipped with a removed balance weight. 1...Rotor, 2...Stator, 3...Rotor yoke,
3a... Rotor yoke a, elemental piece, 9... Stator core, 9a - Stator core element, 12... Balance weight, 12a, 121) - Element piece for balance weight, 13...・Crimp hole, 15 ・Thin steel plate 4=J, 18...
・Annular reinforcement part (A, 19, crimping boss 1゜Figure 1 6 Procedure amendment writing method) February 20, 1942 1 Incident indication 1984 Patent Application No. 184136 2 Name of the invention Brushless Morph Method for punching out iron core pieces 3 Relationship with the case of the person making the amendment Patent applicant address 2 Aichi-cho, Kasugai-shi, Aichi-ken, 486

Claims (2)

[Claims] (1) In a method for punching out a rotor yoke iron piece I having a predetermined outer diameter and a stator core piece I having a fixed inner diameter from a thin steel plate, respectively. A balance that can constitute a balance weight by laminating a plurality of thin steel plates 4=4 surrounded by the outer diameter of the rotor yoke core element, +iif stator a, and the inner diameter of the element piece. A method for punching out V5 core pieces for brushless motors, which is characterized by punching out weight river pieces. (2) The outer diameter of the rotor yoke core element and the inner diameter of the stator core element are eccentrically punched relative to each other.
A method for punching out an iron core piece for a brushless motor according to claim 1.