Two synchronous type couplers are fabricated using Nd-Fe-B magnets.
One coupler is a coaxial type while the other is of axial or face type.
Finite element method is used to predict the flux distribution, torque and other performance parameters.
The torque in such couplers is a function of angular displacement and varies as a sinusoid.
The coaxial coupler is a IO-polar design while axial coupler is a 12-polar design.