We have already proposed a linear actuator which is very simple in the structure. In the previous paper, the analyzed results of its static and transient characteristics have been reported. The analyzed results have shown good agreement with the measured results.
The analytic method to get the calculated values is very simple and easy without the complicate mathematical technique. It is important only to know the permiance distribution in the magnetic circuit exactly.
The calculated values of the flux density, the phase angles, the thrust force, etc. agree well with the measured values of them. However, when the exciting voltage raises to high, the magnetic saturation phenomenon occurs in the iron core and affects the calculated values.
In this report, the improved method is explained which was taken account of the influence of this magnetic saturation as a numerical expression of the magnetizing curves of the iron core. By use of this advanced method, the calculated values of the ring velocity and the variations of the coil current have good agreement with the experimental results.