Patent ID: 11927651
Assignee: JULIUS-MAXIMILIANS-UNIVERSITAET WUERZBURG
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 15:
16. The method of claim 14, further comprising:
generating a second time varying current in each of said coil assembly sectors, said second time varying current comprising the periodic modulation with the rotation frequency and being phase shifted between adjacent coil assembly sectors and further comprising a second periodic modulation with a height modulation frequency, for generating a co-rotating field component at least in a third point between said first point and said second point rotating with said rotating frequency, a field strength of said co-rotating field component being modulated with said height modulation frequency to shift said rotating field free line along said central coil assembly axis,
wherein the coil assembly comprises a height modulation coil in each of said circumferentially distributed coil assembly sectors, a center of said height modulation coil being farther from said central coil assembly axis than a center of said inner coil and being closer to said central coil assembly axis than a center of said outer coil, and wherein the method comprises:
applying said second time varying current to said height modulation coil.