OPERATING A VOICE COIL MOTOR USING A FUNCTION GENERATOR
A voice coil motor can be oscillated at a set frequency in open loop operation using a function generator. See diagram 1 for operation flow.
Step 1. A desired frequency and amplitude is set in the function generator.
Step 2. Based on the function generator settings, a +/- 10V reference signal is sent to the amplifier.
Step 3. The amplifier will take the reference input signal and provide the necessary current to oscillate the voice coil motor at the desired frequency. The amplitude of the frequency determines the displacement of the voice coil motor.
Step 4. The voice coil motor will oscillate at the desired frequency and displacement.
Note: 2 springs should be used with the motor to conserve energy and to provide a centering force for the moving magnet assembly of the voice coil.