An actuator includes a non-magnetic, electroactive material that is
suitable to impart force upon application of an electric current, a power
supply to provide an electric current to the electroactive material and a
controller in operative connection with the power supply to control
application of electric current to the electroactive material. In one
embodiment, the controller is adapted to limit rates at which electric
current is applied to or removed from the electroactive material to
predefined rates, thereby reducing the potential for high frequency
harmonic emissions.