US3772626A

US3772626A - Bobbin

Info

Publication number: US3772626A
Application number: US00253795A
Authority: US
Inventors: L Russell
Original assignee: Von Weise Gear Co
Current assignee: Von Weise Gear Co
Priority date: 1972-05-16
Filing date: 1972-05-16
Publication date: 1973-11-13
Anticipated expiration: 1990-11-13

Abstract

An electrical motor stator bobbin integrally formed of electrical insulating material having relatively enlarged end flanges and intervening sleeve or core for receiving thereabout the electrical winding. Said bobbin is provided with tubular members extending between said flanges and opening at its ends therethrough for receiving therein the ends of the winding and the joined portions of the coil leads. The flanges are provided with an arrangement of openings so that the leads may extend outwardly from the same flange or from opposite flanges.

Description

United States Patent 1191 Russell Nov. 13, 1973 BOBBIN 456,739 7/1968 Switzerland 336/192 l l9 1 Invent my Russell, Washington, "3333222 Z1323 2221mm 332/193 [73] Assignee: Von Welse Gear Co., St. Louis, Mo.

{22] Filed: May 16, 1972 Primary Examiner-Thomas J. Kozma [211 pp No 253,795 Attorney- -Ralph W. Kalish [52] US. Cl 336/192, 310/194, 336/198 [51] Int. Cl. H0lf 27/28 [57] ABSTRACT [58] Field of Search 336/192, 208, 198; An electrical motor stator bobbin integrally formed of 310/194 electrical insulating material having relatively enlarged 2 end flanges and intervening sleeve or core for receiv- [56] References Cited ing the'reabout the electrical winding. Said bobbin is UNITED STATES PATENTS provided with tubular members extending between 3,371,302 2/1968 Mas 336/192 X said flanges and opening at its ends therethrough for 1,647,372 11/1927 Pressley 2 receiving therein the ends of the winding and the 3,189,772 1965 winglef ct e e 310/194 X joined portions of the coil leads. The flanges are prollarmlf etalvided with an arrangement of openings so that the amras 2,858,514 10/1958 Henderson et al 336/192 x leads may extend outwardly from the Same flange FOREIGN PATENTS OR APPLICATIONS from opposite flanges.

Denmark 336/208 5 Claims, 8 Drawing Figures 9 Q a r y X l BACKGRQUND AND SUMMARY OF THE INVENTION This invention relates in general to electrical motors I and, more particularly, to a stator. bobbin therefor.

the inner end portion of the coil to the: bobbin core; in wrapping the joined ends of the wire andv the exposed.

cable leads; and in enclosing the coil to prevent undesired displacement of the leads. Such. relative liberal usage of tape has been a source of marked expense and, obviously, the application of such tape has required necessary, costly labor.

Therefore, it is an object of the present invention to provide a bobbin of the character stated whichembodies means for receiving and retaining the coil-ends without resort to insulating tape.

It is another object of the present invention to provide a bobbin of the character stated which promotes low-cost, high-volume coil winding operations.

It is a further object of the present invention to provide a bobbin of the type stated which maintains the coil leads against displacement during usage without resort to extraneous means; and which is adapted to permit of facile inspection of the joint between. the winding end and the coil leads.

It. is another object of the present invention to provide a bobbin of the type stated. which may be most cheaply manufactured and which is reliable and durable in usage.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevational view of a motor stator containing a bobbin constructed in accordance with and embodying the present invention.

FIG. 2 is a horizontal transverse sectional view take on the line 2-2 of FIG. 1. I

' FIG. 3 is'a vertical transverse sectional view taken on the line 3--3 of FIG. 1. I

FIG. 4is a vertical transverse sectional view taken on the line 4-4 of FIG. 1.

FIG. 5 is an end view of another form of bobbin constructed in accordance with and embodying the present invention, illustrating. same in operative condition with a winding thereabout.

FIG. 6 is a vertical transverse: sectional view taken on the line 6-6 of FIG. 5. I

FIG. 7 is a vertical. transverse sectional view taken on the line 7-7 of FIG. 5. a

FIG. 8 is a horizontal transverse sectional view taken on the line 8-8 of FIG. 5.

DESCRIPTION OF THE PRACTICAL EMBODIMENTS but is set forth for illustration purposes only.

Bobbin A is fabricated of suitable electrical insulating material, such as, nylon or the like, and incorporates a pair of planar parallel, projecting

end flanges

5,6 formed at the end of an intervening core 7, which latter comprises

upper andlower walls

8,9 and

side walls

10,11; said core opening at its ends through

flanges

5,6 thereby defining a receptacle for the intervening portion of stator l. The walls of core 7 are located spacedly inwardly from the proximate edge of the

related flanges

5,6 for defining a volume 12 to receive winding 4 which, for example, is comprised of copper wire.

Formed in the outer face of wall 9, and being coextensive therewith, is a pair of axially parallel, spacedapart tubular members 13,1'4which open at their opposite ends through

flanges

5,6 for defining

passageways

15,16, respectively. Said tubular members being thus integral with bobbin A are formed of the same electrical insulating material. As best seen in FIGS. 1 and 4, winding 4 will extend about the exterior of said

members

13,14.

Also provided in flange 5 substantially intermediate the end opening of

tubular members

13,14, but spaced apart outwardly thereof, is a relatively enlarged aperture 17. The inner end 18 of winding 4 is led outwardly through aperture 17 and thence inwardly of passage 16 of tubular member 14. The outer end 19 of winding 4 is led outwardly from volume 12 through aperture 17 and then is turned inwardly for projection into passage 15 of tubular member 13.

As may best be seen in FIG. 2, within

passages

15,16,

winding ends

18,19 are each fixed, as by brazing, at 20,21, respectively, to the exposed end 22,23 of a

customary coil lead

24,25, respectively. The said coil leads 24,25 thus project outwardly of the ends of

passages

15,16 in flange 6 for the usual circuit-establishing purposes. As shown in FIGS. 1 to 4, said leads may, if desired, be returned through guide openings, as at 26,27, formed in flange 6 (see FIG. 3).

It will thus be seen that the union of the

ends

18,19 of winding 4 and the respective coil leads is maintained within

passageways

15,16, the walls of which provide complete insulation so that the usual wrapping of electrical tape about the developed joint is obviated. Accordingly,

tubularmembers

13,14 constitute protective chambers, the use of which both facilitate winding of bobbin A, as well as any inspection or repair required of the union, while simultaneously obviating the heretofore accepted utilization of relatively substantial quantities of insulating tape. Additionally, the inner diameters of

passageways

15,16 are substantially the same as the outside diameter of the insulated portions of

leads

24,25, as indicated at 28,29, so that a reasonably snug fit is developed therebetween; allowing of rel ative movement of the leads therein under limited pressure for assembly purposes, but maintaining said leads against undesired displacement during usage. The relative maintenance of

leads

24,25 by

tubular members

13,14 prevent the development of any undue strain upon the coil leads. Prior to the present invention tape was used to secure the inner end of the coil in appropriate position; as well as to enwrap the joined ends of the coil and the leads; and to enclose the coil for prevent ing undesired displacement of the leads.

From the foregoing the required assembly is immediately apparent as

leads

24,25 may be inserted through

passageways

15, 16 to present their exposed portions 22,23 for brazing with the related ends of winding 4. Subsequent thereto, leads 24,25 are withdrawn sufficiently through

passageways

16,15 to locate the developed union, as at 20,21, substantially centrally of the aforesaid passageways.

Referring now to FIGS. 5-8, inclusive, A designates a bobbin which is of the same general construction as bobbin A above described so that like parts will bear the same reference numerals. Formed in each

end flange

5,6 of bobbin A equidistant from the proximate end openings of

passages

15,16, but being located outwardly toward the adjacent edge of the related flange, is an

aperture

30,31, respectively, which is continuous in its core-adjacent portion with a narrow, slot-

like opening

32,33 which progresses between

tubular members

13,14 for terminating at the adjacent core wall 9. The inner end 18 of winding 4 is directed through aperture 31 and thence through opening 33 for direction into passage 16 of tubular member 14; for joinder, in the manner above described, to the exposed end of coil lead 24. The outer end 19 of winding 4 is directed outwardly of flange 6 through aperture 30 and is then directed returningly inwardly through passage 15 of tubular member 13 for engagement to the exposed end of coil lead 26. It will thus be seen that the

ends

18,19 of winding 4 are directed through the

respective passageways

16,15 in opposite directionsso that coil lead 24 will be located outwardly of flange 6, while coil lead 25 will be presented beyond flange 5. Each of said leads 24,25 may, if desired, be redirected through the respective flanges by extension through guide openings 34,35 within

flanges

6,5, respectively.

As shown hereinabove, bobbin A is designed to provide for coil leads 24,25 extending from the same end thereof, while bobbin A is constructed to conduce to the extension of said leads from opposite ends thereof in order that the same are presented for particular applications. Thus, the incorporation of

apertures

30,31 and slot-

like openings

32,33 in

flanges

5,6, respectively, promote the desired cable direction.

In view of the foregoing, it is to be seen that the present invention eliminates the need for insulating tape in the formation of stator windings as has been the practice to the present time. The obviation of the need for tape brings about a most substantial relative cost reduction, both from the standpoint of material, as well as labor; while simultaneously rendering any repair or inspection easily achievable.

Having described my invention what I claim and desire to obtain by Letters Patent is:

1. In combination with a predetermined length of uninsulated conductive wire having a normally inner end and an outer end, and a pair of insulated leads having exposed ends, means joining the exposed ends of said insulated leads to said conductive wire inner and outer ends, the improvement comprising an electrical motor stator bobbin being fabricated of dielectric material and having parallel end flanges, means defining a core between, and connected to, said end flanges for winding disposition of said conductive wire thereabout, a pair of enclosed tubular passageways extending between said end flanges and opening at their ends therethrough, the cross section of said passageways being greater than the diameter of the conductive wire and substantially the same as the cross section of the insulated leads for tending to inhibit displacement of said leads therein, the joined inner and outer ends of said conductive wire and said insulated lead ends being disposed within said passageways thereby protecting the joint developed therebetween.

2. In combination with a predetermined length of uninsulated conductive wire having a normally inner end and an outer end, and a pair of insulated leads having exposed ends, means joining the exposed ends of said insulated leads to said conductive wire inner and outer ends, the improvement as defined in claim 1 and further characterized by one end flange of said bobbin having an opening located between the adjacent ends of said tubular passageways and outwardly thereof, said outer and inner, ends of said wire being directed from the winding thereof about said core outwardly through said opening and thence directed returningly toward the proximate flange for extension into the respective tubular passageway.

3. In combination with a predetermined length of uninsulated conductive wire having a normally inner end and and outer end, and a pair of insulated leads having exposed ends, means joining the exposed ends of said insulated leads to said conductive wire inner and outer ends, the improvement as defined in claim 2 and further characterized by said other end flange having a pair of guide openings for projection therethrough of portions of said insulated leads extending outwardly from the respective tubular passageways.

4. In combination with a predetermined length of uninsulated conductive wire having a normally inner end and an outer end, and a pair of insulated leads having exposed ends, means joining the exposed ends of said insulated leads to said conductive wire inner and outer ends, the improvement as defined in claim 1 and further characterized by an opening formed in each end flange between but slightly outwardly of the proximate ends of the tubular passageways, there being an elongated narrow aperture communicating with one of said openings and extending therefrom in a direction of the core and terminating between the proximate ends of the related passageways, the inner end of said conductive wire passing from said winding through said elongate narrow aperture and thence returningly into the related passageway, the outer end of said conductive wire extending outwardly through one of said openings and thence being directed returningly into the related passageway.

5. In combination with a predetermined length of uninsulated conductive wire having a normally inner end and an outer end, and a pair of insulated leads having exposed ends, means joining the exposed ends of said insulated leads to said conductive wire inner and outer ends, the improvement as defined in claim 1 and further characterized by said tubular passageways being provided outwardly of said core, said passageways being mutually axially parallel and being axially normal to the plane of said end flanges.

Claims

2. In combination with a predetermined length of uninsulated conductive wire having a normally inner end and an outer end, and a pair of insulated leads having exposed ends, means joining the exposed ends of said insulated leads to said conductive wire inner and outer ends, the improvement as defined in claim 1 and further characterized by one end flange of said bobbin having an opening located between the adjacent ends of said tubular passageways and outwardly thereof, said outer and inner ends of said wire being directed from the winding thereof about said core outwardly through said opening and thence directed returniNgly toward the proximate flange for extension into the respective tubular passageway.