IL30283A - Magnet core especially for choke coils or transformers - Google Patents

Description

Magnet especially or Frits 28566 The invention concerns a magnet core having an inner laminated core part and an equally laminated shell v especially for choke coils or transformere in series auxiliary apparatus for discharge With hitherto known magnet oores of this kind the uter shell part oonsists of punched annular sheet metal lamellae which are piled upon one in punching the annula sheet meta lamellae relatively larg amounts of waste are produced whereby the manufacturing costs of such cores are one such magnet core has become known in which the outer shell part consists of a ribbon of ferromagnetic material wound while standing on With the magnet core no waste in the manufacture of the outer shell but manufacture of shell part is relatively complicated and requires a special winding with this magnet oore of wound ribbon there at the plaoe of the outer shel part where the magnetlo flux crossing over from the inner core part splits dead material which takes no part in the conduction of the magnetlo These drawbaoks are eliminated in the magnet core according to the Invention in that the shell part made of two which bear against acutely converging end faces of the punched inner oore part and that they consist of sheet metal packets of sheet metal strips extending in the longitudinal and circumferential this design of the magnet core the inner core part and the two may of different kinds of ferromagnetic the inner core part of magnetic and the outer Advantageously the sheet metal strips of the two are off from inside outwardly with an increasing width and at the ends izl such a manner that they bear with their front edges against the acutely converging end f ces of the inner core part with the interposition of an intermediate layer of a suitable resilient material constitutes the air Embodiments of the invention are illustrated in the accompanying shows a front view of a first embodiment of a magnet 2 illustrates a piece of sheet metal from which sheet metal strips for the formation of the o the embodiment according to 1 are and to 5 are front views of three further embodiments of the magnet In all embodiments the inner core part consists of punched lamellae piled upon one another1 which have end faoes 2 converging at an acute angle at both Moreover shell part is formed from two which consist of sheet metal packets of sheet metal strips extending in the longitudinal and circumferential In the embodiment according to 1 each or sheet metal consist of sheet metal strips which have equal length and equal The required number of sheet metal strips 3 are placed upon one another and bent in the middle by means of The inner core built up from punched lamellae and the two consisting sheet strip 3 bears against one end face 2 each so that the transversely the end portions the sheet metal strips Between the side Of portion of innermost sheet metal strip and face 2 an of a suitable resilient material may be provided for the formation of an air In order to he current formation thereby occurring in this in the end portions of the sheet metal sheet meta strips provided at these places lateral slots The manufacture of the slots 4 is done in such a manner that slots 4 are punched spaced from each other into a continuous strip and strips are the severed the middle the in the required width along the line 5 in so that each has slots 4 extending from edge The magnet thus built up is provided with the longitudinal windin 6 and held together b a casing which consists of a having at both sides rimmed edges and a1 hood bent rims 10 engaging the rims By pressing togethe the interengaing rims Or by forming notches the air gaps existing between inner core part the and formed by the intermediate layers consisting of a resilient can altered and the current flowin the winding 6 thereby be the current being measured by means of an instrument while the notches are being Subsequently the magnet is i impregnated and retains the adjusted I the embodiment of the magnet core illustrated in the two the shell part consist of sheet metal strips of equal but different by notches 19 at places where the two hollows 20 ar 5 shows a further embodiment of a magnet whose two consist of sheet metal strips bent in whereby a rectangular winding is formed for a longitudinal winding The side parts o the sheet penetrate sheet holding the parte of the two 8 are whose lateral parte can be compressed more or less the adjustment of the In the embodiments described it has bee assumed that the two outer are approximately as long as the piling height of the inner core the two outer may longer than the piling height of inner part that they cover the longitudinal windings at the e ma even be so long that two o more separa e cores with windings can be accommodated while with the embodiments described it has been assumed that the inner core part and the two consist of the same ferromagnetic it would possible to use for this purpose different kinds of For the inner core part could consist of a and the outer shells of unalloyed and therefore cheap sheet insufficientOCRQuality

Claims (1)

1. CLAIMS A core having an inner punched laminated core part and an equally laminated shell especially choke coils or transformers of series auxiliary apparatus for discharge and wherein two which form the shell part and which consist of sheet metal packets from sheet metal strips which extend relative to the inner core in the longitudinal and circumferential direction against acutely converging end faces of the inner A magnet core according to Claim characterized in that the inner core part and the two consist of different ferromagnetic A magnet core according to Claims 1 and characterized in that the inner core part consists of material the outer Shells of common unalloyed sheet A magnet to Claim characterized in tha air gaps are formed by an intermediate layer at the joints between the inner punched core part and the of the shell A magnet core according to Claim characterized in that the sheet metal strips of the two are so bent from inside outwards with increased vridth and at ends that they bear with their end faces against the acutely converging end faces of the inner core A magnet core according to Claims 1 characterized in that the ends of the sheet metal strips of the extend obliquely to the acutely converging end faces of the inner core or perpendicularly to the median plane of the core A magnet core according to Claims 1 and characterized in that the sheet metal strips of the abut upon t converging end of part A magnet core according to Claim characterized tha the sheet of angularly be t sheet metal strips of width and abuts the ends with inner side against the acutely converging end faces of the inner core part the magnetic transversely penetrating the plane of the sheet metal strips at ends of the sheet metal A core accordin to Claims i characterized in for reduction of the eddy current t e strips are provided at the ends slots extendin inwards from the side A magnet accordin Claim characterized in that the bent at an angle and the winding space forms a triangle with rounded apex aocommodation of a trapezoidal winding A magnet core according to Claim characterized in that the have two angular bonds so that the winding space forms a A magnet according to Claim characterized that the forming the shell part correspond in length approximately to the piling height of the inner core part magne core aocording to Claim characterized that the forming the shell part longer than the piling height of the inner core part A magnet core according to Claim characterized in that the forming shell part re so long that two or inner with windings ca be inserted in magnet core to Claim characterized that its parts are held together by a casing or 13 or 15 or which be deformed for adjustment of the by notches pressed into For the Applicants insufficientOCRQuality