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Name of Experiment: application of power amplifier based on voice coil motor test system design

Research Direction：design of voice coil motor test system

Experiment Contents: the air viscous drag coefficient of the voice coil motor is identified through the test, and the Simulink modeling of the direct drive water hydraulic valve of the voice coil motor is completed.

Experimental Purpose: based on the developed direct drive water hydraulic control valve of voice coil motor, the structure of direct drive valve is improved, the dynamic mathematical model of direct drive water hydraulic valve of voice coil motor is established, and the experimental research is carried out

Experiment Equipment: linear bearing, signal generator, power amplifier, displacement sensor, voice coil motor, force sensor, spring

Experiment Process:

（1）Simulink modeling of direct drive hydraulic valve for voice coil motor

An open-loop simulation model from the coil voltage of the voice coil motor to the spool displacement was established in MATLAB/Simulink, as shown in the figure:

（2）Test system design and damping coefficient identification of voice coil motor

Experiment Result:

The signal generator is used to output sinusoidal signals to the power amplifier, and the power amplifier drives the motor to realize oscillatory motion. After the oscillation is stabilized, the signal generator is turned off, and the vibration curve of the position signal of the voice coil motor changes with time is collected. MATLAB is used to fit the vibration curve as a formula, as shown in the figure. The air damping coefficient was identified as 10.96N·s/m.

The performance of the amplifier in the experiment: drive the motor to achieve oscillatory motion