US 4,308,512 AGranted

Modular air core coil inductance assembly

OwnerGiorgio Capecchiacci, Eugenio Mainardiinventors

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Abstract

The present invention preferably comprises a modular air core coil inductance assembly which is comprised of a plurality of spiral windings which are magnetically coupled to each other and disposed in planes which are orthogonal to the longitudinal axis of the resultant air core coil. The modular air core coil assembly may preferably comprise a plurality of air core coil subassemblies each of which preferably comprises at least one spiral winding disposed on a winding support member, with the winding preferably being an electrical conductor wound in the shape of an Archimedes spiral disposed in a plane orthogonal to the longitudinal axis of the coil; a fixing or holding member which is disposed facing the spiral winding in order to set or hold it in position; at least two shields fixed on the coil ends in order to prevent magnetic coupling between the different coils; and at least two spacing members disposed so as to obtain the desired distance between the shield and the winding. In order to assemble a single coil or subassembly, at least one winding support having a spiral winding disposed thereon is provided along with a holding member, a pair of spacing members and a pair of external shields, all of which are bolted together. If additional coils or subassemblies are added along the longitudinal axis, these too are preferably bolted together with the external ends of the various coils being connected together. In addition, a blower or ventilator fan may be disposed at one end of the modular air core coil inductance assembly along the longitudinal axis of the assembly in order to generate air flow along this axis.

Claims21

Dependent claims

A modular air core coil assembly comprising at least one modular coil subassembly, said one subassembly having a longitudinal winding axis, at least one other modular air core coil subassembly coaxially aligned along said longitudinal axis with said one subassembly, said other modular air coil subassembly comprising at least one winding support member having a plurality of spaced apart winding retaining grooves disposed thereon concentric with said longitudinal axis, said support member comprising an air flow passage therethrough, at least one spiral winding electrical conductor disposed in a predetermined quantity of said grooves on one side of said support member, said quantity of grooves in which said conductor is disposed being dependent on the desired inductance value for said one subassembly, said grooves being arranged to form an Archimedes spiral winding for said winding lying in a plane orthogonal to said longitudinal axis with said air flow passage therethrough;

at least one holding member disposed in juxtaposition with said support member with one face of said holding member being in contact relation with said one side of said support member carrying said spiral winding in order to hold said winding in position in said grooves;
a magnetic shield member disposed at each of the ends of said one subassembly;
and at least one spacing member disposed between each of said shield members and said winding support member for spacing said shield member from said winding support member, said winding support member, said holding member, said spacing member and said shield member each having an air flow passage therethrough and being coaxially aligned in juxaposition to each other along said longitudinal axis.

Dependencies are inferred from the claim text.