GB1598406A

GB1598406A - Method for manufacturing coiled magnetic cores for electrical machines and device for effecting same

Info

Publication number: GB1598406A
Application number: GB1594678A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-04-21
Filing date: 1978-04-21
Publication date: 1981-09-23
Also published as: DE2817660A1

Description

(54) METHOD FOR MANUFACTURING COILED MAGNETIC CORES FOR ELECTRICAL MACHINES AND DEVICE FOR EFFECTING SAME (71 We, VALERY ALEXANDROVICH KULIKOV USSR Vladimir, ulitsa Bobkova, 8 kv 2 ERNST ARAKELoviCH STEPANIAN -- USSR Vladimir Suzdalsky prospekt 7, kv 41. & EMILEN ARAKELO VICH STEPANIANTS - USSR Vladimir, us its Zelenaya 4 kv 6 all citizens of the U.S.S.R. do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to the manufacture of electrical machinery and, more particularly, to methods and devices for manufacturing coiled magnetic cores for electrical machines.

The invention is readily applicable to the manufacture of stators and rotors of electrical machines.

According to the present invention there is provided a method of manufacturing a coiled magnetic core for an electrical machine, wherein a continuously fed band is coiled edgewise so that elongation of the band is maximum at the edge thereof which forms the external surface of the coil and decreases uniformly towards the opposite edge, and radially extending recesses are provided in at least one side of the band during the coiling thereof.

The invention also provides a device for carrying out the method comprising a bed, means for tensioning the band and a rotory disc mounted on the bed, a plurality of fingers uniformly spaced apart around the disc for moving the band around with the disc, which disc is received in a recess provided in the bed, a straight guide for guid ing the band to the disc and an arched guide for guiding the band around the disc, a shaping member interposed between the straight and arched guides and having a wedge shaped head with a working edge extending in a radial plane and at an angle to the side surface of the rotary disc, drive means for providing reciprocating motion of the shaping member to form recesses in the band.

The use of the proposed method and device for manufacturing coiled magnetic cores for electrical machinery makes it possible to produce magnetic cores for electrical machinery of all types and sizes, capable to realize the desired efficiency targets.

A better understanding of the present invention will be had from a consideration of the following detailed description of a preferred embodiment thereof, taken in conjunction with the attached drawings, wherein: FIG. 1 is a general view of a device for manufacturing coiled magnetic cores, in accordance with the invention; FIG. 2 is a view taken on line Il-Il of FIG. 1, FIG. 3 is a view taken on line IIT-III of FIG. 1, FIG. 4 is a view taken on line IV-IV of FIG. 1; FIG. 5 is a view of a band prior to and after deformation; HG. 6 is view of a band, provided with recesses, prior to and after deformation: FTG. 7 presents different cross-sections of the band in the zone where it is acted upon by the shaping member; FIG. 8 is a sectional view of the band and shaping member, taken at the time of deformation: FIG. 9 is a bottom view of the band and shaping member; The proposed device for manufacturing coiled magnetic cores from a continuously fed band 1 (FIG. 1) comprises a rotary disc 2 having a smooth working surface and mounted on a shaft 3. The disc 2 carries uniformly spaced fingers 4. Prior to being coiled, the band 1 may be provided with slots, in which case the number of the fingers 4 is equal to that of slots in a single complete stator turn.

The device further includes a bed 5, whereupon there are mounted a straight guide 6 carrying a means 7 for tensioning the band 1, and an arched guide 8. Also mounted on the bed 5 is the housing of a drive 9 intended to set a shaping member 10 in reciprocating motion.

A detachable cutter 11 is mounted on the bed 5 and serves to separate the coiled band 1 from the disc 2.

The band 1 is drawn along guide channels 12 and 13. The guide channel 12 (FIG.

2) is arched and formed by a portion of the rotary disc 2 and the arched guide 8. The guide channel 13 (FIG. 3) is straight and formed by the bed 5, the straight guide 6 and the means 7 for tensioning the band I.

A cam 14 is secured to the bed 5 and serves to set the fingers 4 (FIG. 4) in reciprocating motion. The heads of the fingers 4 are in permanent contact with a groove 15 provided in the cam 14. The width of the groove 15 is somewhat greater than the height of the heads of the fingers 4; the groove 15 has a closed configuration.

The shaft 3 is driven by a drive 16. A bush 17 is mounted on the shaft 3 to serve as a stop for the rotary disc 2 and also to increase the latter's rigidity. The bush 17 and disc 2 are secured on the shaft with the aid of a washer 18 and a nut 19.

FIGS. 5 and 6 show coiled bands 1. Following each deformation cycle, the elongation of the band 1 is at its maximum at an edge 20, which forms the external diameter of the coil, and at its minimum at an edge 21 which forms the coil's internal diameter.

The band 1 (FIG. 5) may be solid; it may also be provided in advance with slots 22 (FIG. 6).

FIG. 7 shows possible cross-sections a, b, c and d of the band 1 after it is acted on by the shaping member 10 (FIG. 4).

The cross-section a of the band 1 is produced by using the shaping member 10 (FIG. 8) constructed as a die having a head 23. The head 23 is shaped as a wedge whose working edge 24 extends radially and at an angle to a side surface 25 of the rotary disc 2.

In order to bring the edjacent turns of a magnetic core as close together as possible throughout the height of the magnetic core pack, and in order to ensure a reliable conjugation between the pack and the electromotor's bed, it is necessary that recesses 26 (FIG. 9) in the zone of the edge 20 (FIGS 5 and 6) should alternate with portions 27 (FIG. 9) preserving the original thickness of the band 1.

The proposed device operates as follows.

The band 1, which may be solid (FIG. 5) or provided in advance with slots 22 (FIG. 6), is drawn through the tensioning means 7 (FIG. 1) so that its end is found between the straight guide 6 and arched guide 8. The cam 14 sets a finger 4 (FIG. 4) in reciprocating motion so that it is received in a slot 22 (FIG. 6) of the band 1, or against the inner edge of the band 1 if there are no slots 22. The device is then brought into action.

To coil the band 1, the shaping member 10 (FIG. 9) driven in reciprocation by its drive 9 successively deforms the solid portion of the band 1 throughout its length in the transverse direction so as to form the radially extending recesses or indentations 26 whose geometry makes it possible to produce a coil in the form of concentric circles with desired parameters. Following each deformation cycle, the elongation of the fibers of the material over the solid portion of the band 1 (F1G. 6) should be at its maximum at the edge 20, which forms the external diameter of the coil, and at its minimum at the edge 21. As the device is brought into action, the disc 2 (FIG. 4) starts rotating, the band 1 is brought into motion, and the fingers 4 are successively engaged with the slots 22 (FIG. 6) of the band 1, or the edge of the band if there are not slots, because the heads of the fingers 4 (FIG. 4) are acted upon by the cam 14 in the zone between the straight guide 6 and arched guide 8. When the fingers 4 are meshed, the guide channel 12 is confined by them on one side over a range of 1800, The detachable cutter 11 (FIG. 1) is used to separate the coil from the rotary disc 2.

Depending on the geometrical parameters of magnetic cores to be produced, the device of this invention can vary the frequency at which the band 1 is deformed by varying the frequency of reciprocating motion of the shaping member 10; the device can also vary the speed of the band 1 by varying the rotation speed of the disc 2. This is made possible due to the fact that the shaping member 10 and disc 2 are provided with individual drives 9 and 16, respectively (FIG.

4).

The proposed method and device for manufacturing magnetic cores for electrical machines have a number of advantages over the existing methods and devices used for the same purpose. These advantages are as follows: The solid portion of the band 1 coiled into a magnetic core may be practically of any cross-sectional profile. This advantage enables one to determine optimum cross-sectional profiles of coiled magnetic cores to ensure high efficency of electrical machinery.

The invention makes it possible to produce magnetic core packs for electrical machinery of all types and sizes.

The proposed process of manufacturing coiled magnetic cores is extremely simple, The invention accounts for a high utilization factor of expensive electric steel.

The proposed method ensures a high productivity; the invention makes it possible to automate the entire process of manufacturing magnetic core packs for electrical machinery.

Claims

WHAT WE CLAIM IS:

1. A method of manufacturing a coiled magnetic core for an electrical machine, wherein a continuously fed band is coiled edgewise so that elongation of the band is maximum at the edge thereof which forms the external surface of the coil and decreases uniformly towards the oposite edge, and radially extending recesses are provided in at least one side of the band during the coiling thereof.

2. A device for use in carrying out the method of claim 1, comprising a bed, means for tensioning the band and a rotary disc mounted on the bed, a plurality of fingers uniformly spaced apart around the disc for moving the band around with the disc, which disc is received in a recess provided in the bed, a straight guide for guiding the band to the disc and an arched guide for guiding the band around the disc, a shaping member interposed between the straight and arched guides and having a wedge shaped head with a working edge extending in a radial plane and at an angle to the side surface of the rotary disc, drive means for providing reciprocating motion of the shaping member to form recesses in the band.

3. A device according to claim 2, including cam means for reciprocating the fingers into and out of engagement with the band.

4. A device according to claim 2 or 3, wherein cutter means is provided for separating the coiled band from the rotary disc.

5. A method of manufacturing coiled magnetic cores for electrical machines, substantially as herein described with reference to the accompanying drawings.

6. A device for manufacturing coiled magnetic cores for electrical machines, substantially as herein described with reference to the accompanying drawings.