The force with a negative value means that it is in the opposite direction of the
force direction shown in Fig. 2. It is shown that the coils exhibit fairly large radial forces compared to the corresponding axial
forces. The electromagnetic force in the radial direction decreases from the middle to the ends, and the maximum radial forces appear at the middle coils. On the contrary, the results show that the axial electromagnetic force increases from the middle to the ends of the coils, and there are no significant axial forces on the middle coils.