Patent ID: 9520823
Filing Date: 2016-12-13
CPC Classification: H02P

Claim Text:
1. A method for controlling an actuator, comprising: providing a drive circuit having an input and a first input/output terminal and an actuator coupled to the first input/output terminal; causing the actuator to move in response to a first drive signal generated by a signal generator coupled to the input of the drive circuit; determining a resonant frequency and a ringing amplitude from a movement of the actuator using a ringing characteristic determination circuit, wherein the ringing characteristic determination circuit has an input coupled to the first input/output terminal of the drive circuit and to the actuator; generating a second drive signal from the signal generator in response to resonant period data and ringing amplitude data received from the ringing characteristic determination circuit and in response to actuator position data, wherein the actuator position data is derived by summing or subtracting a new position of the actuator generated by a first position indicator to or from a previous position of the actuator generated by a second position indicator; and causing the actuator to move in response to the second drive signal.