Numerical and experimental analysis on performances of coreless coil inductance

The coreless coil inductance calculation of MEMS in human body was proposed,focusing on the mutual inductance of non-coaxial coils.The effects on the mutual inductance due to main geometric parameters,such as gap,obliquity and radius,were analyzed.The numerical results indicate that mutual inductance decreases with the increase of axial and radial gaps and the influence of axial gap on mutual inductance is much bigger than the radial one;with the increase of obliquity,mutual inductance decreases,and when obliquity angle is equal to 90°,it is nearly zero;when coil radius varies,mutual inductance has a maximum.Furthermore,a tri-axial moving platform is put forward in which gap and obliquity can be adjusted easily and accurately.On the basis of the above,a mutual inductance measuring system is established,and the testing results are consistent with the calculation.