FEMM program in Matlab to obtain the forces from EI core electromagnetic actuator for different gaps and current.

 The top surface of the E actuator, facing the thrust plate is not flat due to previously unknown error in the surface grinder bed level.

The top of the E actuator needed to be all at 40mm, but they were differing to a max of 140 microns above the mean as shown below. When the thrust plate was touching the top surface of the E actuator, it was actually 140 microns above the center leg, not flush with the actuator. The forces that were measured with the load cell are actually at a higher gap than the gap measured with the eddy current probe.

The uneven top surface due to error in surface grinding operation