US 2425622 A
Abstract available in
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Description (OCR text may contain errors)
Patented Aug. 12, 1947 2,425,622
UNITED STATES PATENT ornca comnmrm ramsrormnrt sun ansc'roa Charles W. Kronmiller, Fort Wayne, Ind assignor to General Electric Company, a corporatlon of New York Application August 21, 1945, Serial No. 811,895 a Claim!- Cl. 175-358) This invention relates to electric induction ap interleaved E. shaped punchings. The two outer paratus, and more particularly to improvements cores I and I consist of aligned E punchings and inmulti-ple corety-pe electric induction apparathe magnetic circuits of these outer cores are tus. 7 closed by the end yoke members of the core 2, An example of a multiple core type electric inthere being gaps between the core I and the cores duction apparatus is a combined transformer- I and I, which gaps are preferably filled by suitreactor for energizing and ballasting two fluoresable spacers 4 and I which may be of paper.
cent lamps. Atypical apparatus of thiskind hasa As shown in phantom by dashed lines, the
transformer and two reactors, one for each lamp. center leg of each of the three cores is surrounded Thethree units are aligned with the transformer 10 by a separate coil.
. between the two reactors, there being butt Joints In order firmly to hold the structure in alignor gaps between the transformer core and the merit, four tie-bolts e are provided, there being reactor cores two on each side of the core, and all or the bolts It is desirable to hold these units together extend the entire length or the aligned structure. ora ly, in such a way that (1) they stay properly is The corresponding ends oi bolts which are on opaiigned, so as to provide the proper gaps between posite sides of the core. that is to say which have vthe cores, and (2) their laminatlons are adequatethe core punchings between them, are connected ,ly clamped together, so as to prevent excessive by brackets'or mechanical yoke members I. and noise due to vibration, nuts I are provided for putting the bolts 8 under In accordance with this invention,there is pro- :0 tension and thus hold the unit together. vided a novel and simple clamping construction I have found. however, that a structure as thus consisting of tensioned tie members which extend far described will not stay in alignment but will the entire length of the aligned cores, on opposite weave or rig-m. thus: disturbing the adjustment sides thereof,' incombination with cross brackets or calibration of the gaps between the cores and or keepers which serve the double purpose of 7,} also reducing the support of certain of the outclamping the core laminations together and also side laminations at places where the weave tends clamping the tie members to the aligned core to move the cores away from the tie bolts. I have 1 structure. In this manner the tie members need also found that this zigsasging can be corrected have negligible rigidity and need only have by means of keepers orcross clamping members strength under tension. The necessary rigidity is which extend across the laminations and clamp supplied by the action of the cross brackets or the tie-bolts O to the core structure. Preferably,
keepers. 7 although not necessarily, these clamping mem- An object of the invention is to provide the new bers 0 are-attached in a suitable manner, as by and improved electric induction apparatus. welding, to the tie bolt 0, and such welds are in- A further object or the invention is to provide 35 dicated by the dots at the ends cit the members I. a simple and inexpens ve clamping structure ior ordinarily the clamping members 0 should be multiple aligned core type electric induction apadjacent to but not over the gaps between the para us. Y cores, as to prevent a magnetic bridgins action by Al addit Object o invention i to Pr the clamping member. However, they can be on vide a novel and simple elongated multiple core either side of the gaps, that is to say they can type ele ric ind c i n pp u clamp theeorev I or the cores I and 8. Also. it The invention can be better understood from they are made of non-magne ic material, such as the description, taken in connection brass or stainle steel, they can be mounted with the accompanying drawing. and its scope directly over the clamps.
will be pointed out in the appended claims. In the modification shown in'Fig. 2 the three In the drawing. Fig. 1 is a perspective view of cores: I, Land I are or the so-called core type in bodiment of the invention in which the and the three coils, which are shown in phantom, cores are of the shell type. and Pi 2 is a modlnare on one leg res ectively or the cores. cation having core type cores. In order to hold 'the winding leg sides or the Referring now to the drawing, and more parcores together, thin clamping strips it are proticularly to Fig. i, there is shown therein an elecvided, which extend through the coils and lie flat trio induction apparatus consisting of three shell against the outer edges of the winding legs of the type cores: I, I and 3. These three cores are all cores. These strips are held in position by bolts made up of stacked punchings, the center ore I I! and II, which pass through the cores i and l, by way of example, as comprising and thus serve to clamp the laminations or these cores tightly together. The strips II should be made of non-magnetic material so as to prevent magnetic bridging of the gaps between the cores.
On the opposite side of the core, the clamping consisting of the tensioned tie rods I, end yokes I, and the cross clamping brackets orkeeperslarethesameasinl'ig. 1.
While there have been shown and described particular embodiments of the invention, it will beobvioustothoseskiiledin theartthatchangm and modifications can be made without departing from the invention, and. therefore, it is aimed in the appended claims to cover all such changes and modifications as fall within the true spirit andscopeoftheinvention.
WhatIclaimasnewanddesir-e tosecureby Letters Patent of the United States, is:
i. In combination, a plurality of electric induction devices each having a netic core composed of stacked punchings, said cores being aligned parallel to their laminations with magnetic gaps between said cores, at least one tensioned tie member on each side of said aligned cores and extending the of said aligned cores, said punchings being between said members, clamping members between the ends of said aligned core for clamping said tie members to said aligned cores, and cross members extending between corresponding ends of said tie members.
2. In combination, a plurality of electric induction devices each having a laminated magnetic core composed of stacked punchings, said cores being aligned parallel to their laminations with magnetic gap between said cores, at least one tensioned tie member on each side of said aligned cores and extending the entire length of said aligned cores, said punchings being between said members, clamping members adjacent to said gaps for clamping said tie members to said aligned cores, and cross member extending between corresponding ends of said tie members.
3. In combination, at least three electric induction units each having a square edged core, laid units being in abutting relation, a pair of tensioned parallel tie members said cores on opposite sides thereof, mean for ciamptngsaidtiememberstoatleastoneofsaid entire length thecorrespondingendsofsaidtiemembersfor having an E shaped core,
aligned with opposite sides of said shell type core extending along applying pressure to the end core members.
4.1a ombination, a transformer having a core provided with opposite yoke members havingflatparalleloutersurfaees,apairofreactors having open m gnetic circuit core members provided 'with rconnectin theeon'esponding ofsaidtieboltsonoppositeendsofsaid 5. In combination, a single-phase transrormer ashelltypecoreapairofreactorseach said reactor cores being transformer core, and cross members for intereorresponding ends of said tie 6. In combination, a three core electric induction a said coreabeingalignedwith butt joints between the center one and both end ones, tie bolts extendin along pposite sides of said cores, clamp member for clamping said tie bolts to the center core, and yoke member between the corresponding ends of said tie bolts.
CHARLEa W. KRONIIILLIR.
REFERENCES CITED The following references are of record in the iile of this patent:
UNITED STATES PATENTS Number Name Date 581,878 Thomson May 4, 1M 1,005,290 Brand Apr. 2s, 10:: 1,588,571 Busse June 15, 1020 2,016,790 Perlman Oct. 8, 1988 Packard et al. Jan. 2, 1900