Band coil

Abstract

The invention relates to a method of manufacturing a band coil by means of a material-removing process performed on the coils so as to obtain a band coil which has a profile in the direction of the coil axis. Such a process may be a discharge process, an etching process or a mechanical grinding process. The obtained band coils may have such a shape that certain coil sides are effective whereas other coil sides are interfering as little as possible. Such band coils can be very successful in planar motors.

1 . A method of manufacturing a coil formed by a wound band-shaped, current-conducting foil, which coil has a coil axis, characterized in that the coil is given a profile in a direction parallel to the coil axis of the coil by means of a bulk-removing operation performed on the coil turns of the coil.  
     
     
         2 . A method as claimed in  claim 1 , characterized in that the bulk-removing process is a spark erosion process.  
     
     
         3 . A method as claimed in  claim 1 , characterized in that the bulk-removing process is an etching process.  
     
     
         4 . A method as claimed in  claim 1 , characterized in that the bulk-removing process is an electrochemical process.  
     
     
         5 . A method as claimed in  claim 1 , characterized in that the bulk-removing process is a mechanical machining process.  
     
     
         6 . A coil formed by a wound band-shaped, current-conducting foil having winding sides and a coil axis, characterized in that at least a portion of the winding sides is staggered with respect to the remaining portion of the winding sides in a direction parallel to the coil axis of the coil.  
     
     
         7 . A coil as claimed in  claim 6 , characterized in that the coil has two pairs of mutually opposed winding sides, the one pair of mutually opposed winding sides being staggered relative to the other pair of mutually opposed winding sides in a direction parallel to the coil axis of the coil.  
     
     
         8 . An assembly of at least two coils, wherein between a pair of mutually opposed winding sides of one of the coils as claimed in  claim 7  at least one winding side of another coil is situated.  
     
     
         9 . A translatory or rotary motor with two parts which are movable relative to one another, the one part comprising a system of magnets and the other part at least one coil or an assembly of at least two coils as claimed in any one of the  claims 6  to  8 , while one pair of mutually opposed winding sides of a coil lie closer to said one part than does the other pair of mutually opposed winding sides.