Abstract: A hybrid analytical modeling method for moving coil electromagnetic linear drive device is proposed. The model is used to further improve the electromagnetic field analytical model accuracy of the drive device. The hybrid analytical model combines the magnetic potential model and the equivalent surface current model to research the electromagnetic characteristics of the driving device. Define radial flux density correction coefficient to modify the single magnetic potential vector model. Use electromagnetic field boundary conditions of moving coil electromagnetic linear drive device to establish a more accurate electromagnetic characteristics mathematical model. Finally, obtain the distribution law of magnetic field in the air gap and the electromagnetic force - travel function. The FEM and experimental results show that the hybrid model is more accurate compared with the single magnetic potential model. After modification, the maximum error of thrust solution is reduced from 6.9% to 2.8% and the solution accuracy is improved by 4.1%, which prove the validity of the modified method. The error between the experiment and the analytical results is less than 2.5%, which verifies the correctness and accuracy of the analytical model. This method provides a theoretical basis for the modular design of electromagnetic linear drive device and the sensorless control, and enrich the control method of all-electric integrated drive system.

Key words: electromagnetic linear drive device, hybrid analytical model, magnetic potential vector model, equivalent surface current model