Pulse width modulation electromagnetic servos (PWMES)‎ simulation and analysis

الملخص EN

Electromagnetic servos (ES) are devices converting the electrical signals to a mechanical motion.

The ES are simple in design, stricture and reliable.

They have wide applications in control and guidance systems.

These devices have disadvantage of their nonlinear characteristics in the dynamic systems which can be overcome by using PWM technique with a frequency suitable for the requirements of that dynamic system.

This paper includes the following :- a- Theoretical background, structure, operation, performance, mathematical model and the block diagram of these devices.

b- Simulation and analysis of a supposed type of PWMES suitable for applications in control and guidance systems of small aircrafts and small calibers guided missiles by using Mat lab and Simulink programs.

c- Results of some important tests and showing some of the important performance behavior and parameters.

This simulation program enable the users to choice and to test the effect of any parameter and to investigate its influence on the performance of the device, for example the dimensions and the magnetic characteristics of the ferrite parts, effect of the air gab ,influence of the coils and windings, showing the values and behavior of the motion and its speed and acceleration, the effect of changing the frequency, the effect of the load, showing the values of generated forces and moments, or any electric, magnetic or mechanical parameters.