Patent ID: 7971342

Claim:
A method of fabricating a conductor assembly along a curvilinear axis, the assembly being of the type which, when conducting current, generates a magnetic field or in which, in the presence of a changing magnetic field, a voltage is induced, comprising: specifying, for a coil which can be formed along a straight axis, a first magnetic field pattern along a first plane transverse to the straight axis, the field pattern including a main magnetic field component of a first order in the first plane; specifying a first wiring pattern about the straight axis for generating the first magnetic field pattern, the first wiring pattern representable by a first series of points about the straight axis; generating a second series of points about a curvilinear axis in accord with a curvilinear axis specification to provide a second wiring pattern derived from the first series of points; characterizing, in a plane transverse to the curvilinear axis about which the second wiring pattern is formed, a magnetic field which can be generated according to the second wiring pattern; identifying, in the plane transverse to the curvilinear axis, presence of at least a first magnitude magnetic field component of a second order different than the first order main magnetic field component; generating, also along a straight axis, a third series of points based in part on the first series of points and incorporating a first modulation which results in a third wiring pattern such that: in a plane transverse to the axis about which the third wiring pattern is formed, a magnetic field generated according to the third wiring pattern includes a second multipole component of the second order which, if added to the first multipole component of the second order, in the plane transverse to the curvilinear axis of the second wiring pattern, would reduce the net field strength of components of the second order in the plane transverse to the curvilinear axis; generating a fourth series of points also about an axis in accord with the curvilinear axis specification to provide a fourth wiring pattern derived from the third series of points; and fabricating, about an axis in accord with the curvilinear axis specification, a coil based on the fourth wiring pattern.