The Research And Development Of Fast Steering Mirror Servo Actuator Drived By Eletromagnetics Method

Research of laser communication in space is one of the hot research fields.The success laser communication in space deeply depends on the Fine Pointing Mechanism(FPM)which is a very important mechanism to keep the reliable communication link.The research of this thesis is focus on a new type of FPM which is driven by electromagnetics method.The research contents and results are chiefly as follow:1.Researched on conceptual design of FPM by electromagnetic driving? A new type of FPM driven by electromagnetic has been designed with larger scanning range,faster response speed and higher deflection accuracy.The mechanism has a diaphragm to support the reflect mirror.Controlling of current strength in solenoid coil,We can obtain pull and push forces which drive the reflect mirror of FPM to expected position.2.A circle diaphragm used in the driving FPM is designed in details.The circle diaphragm have smaller stress concentration,better fatigue life,better reliability,and with very simpler structure.The properties of circle diaphragm Loaded different driven forces and with some different thickness are researched through simulation.The results show that initial descend of reflect mirror is nearly linear to the thickness of the diaphragm,and the displacement in rotate process in different initial pull force isnearly linear to the drive force,furthermore the rotate angle is nearly linear to the driving torque.All of these rules can make the system design and control be simplified.3.In order to design electromagnetic system of FSM,we carry the simulation of electromagnetic driving system through ANSYS Maxwell.The results shows that magnetic field of every electromagnetic drive unit is independent on each other respectively,the electromagnetic force is partly linear to the air gap between electromagnetic and the permanent magnet,especially,when the air gap is much bigger.The electromagnetic force is linear to the exciting current.Current coefficient is nonlinear to the air gap.4.A system to test the electromagnetic drive force are built,the test results shows the electromagnetic drive force curves of simulation are highly matched that of the actual one.The effectiveness and accuracy of design simulation has been proved.5.Finally,experiments and simulations of electromagnetic driving FSM are performed,which is based on a platform of d SPACE.The results shows that the bandwidth of this electromagnetic driving FSM can reach up to 400 Hz while the scanning range is ±0.01°,the bandwidth of this electromagnetic driving FSM is 300 Hz while the scanning range is ±0.1°,the bandwidth of this electromagnetic driving FSM is 30 Hz while the scanning range is ±1°,the bandwidth of this electromagnetic driving FSM is 15 Hz while the scanning range is ±2°,The research of this thesis shows that Fine Pointing Mechanism(FPM)driven by electromagnetics actuator have smaller volume,less weight and power consumption,it can completely satisfy demand of laser communication in space.