Thrust Compensation System Of Dual-Winding Voice Coil Motor

摘要

A thrust compensation system of a dual-winding voice coil motor, which is used for driving the voice coil motor having secondary windings arranged between each pair of main windings, wherein the main windings are the main working windings of the voice coil motor and used for providing the output electromagnetic force required by the driving system of the voice coil motor; the secondary windings are compensation windings and used for providing the thrust ripple opposite to the main windings and compensating the thrust ripple of the main windings, so that the resultant force of the output thrust of the main windings and the secondary windings of the voice coil motor is constant. The scheme provided by this invention not only greatly reduces the thrust ripple of the servo system of the voice coil motor, but also realizes the ultra-high precision control of the servo drive system of the voice coil motor when the system is under low switching frequency, improves the stability of the system, reduces the system loss, and greatly reduces the cost of the drive controller.

主权项

1. A thrust compensation system
comprising: a first H-shaped full-bridge drive circuit that is connected to main windings of a voice coil motor, including first left bridge arms of a first field-effect transistor and a fourth field-effect transistor connected in series and first right bridge arms of a second field-effect transistor and a third field-effect transistor connected in series; a first PWM control unit for providing a control signal for the field-effect transistors of the first left bridge arms and the first right bridge arms; a first DC (direct current) voltage source providing power for the first left bridge arms and first right bridge arms at the same time; a second H-shaped full-bridge drive circuit that is connected to secondary windings of a voice coil motor, including second left bridge arms of a fifth field-effect transistor and an eighth field-effect transistor connected in series and second right bridge arms of a sixth field-effect transistor and a seventh field-effect transistor connected in series; a second PWM control unit for providing a control signal for the field-effect transistors of the second left bridge arms and the second right bridge arms; a second DC voltage source providing power for the second left bridge arms and a third DC voltage source providing power for the second right bridge arms at the same time as the second DC voltage source; wherein the second DC voltage source and the third DC voltage source are configured as: {R2=R1L2+Kf2Kf1ML1+Kf1Kf2MUdc21=(2-2D)Kf1Kf2·L2+ML1+Kf1Kf2·MUdc1Udc22=2DKf1Kf2·L2+ML1+Kf1Kf2·MUdc1 wherein:
Udc1 stands for the voltage value of the first DC voltage source;Udc21 stands for the second left bridge arm, namely the voltage value of the second DC voltage source;Udc21 stands for the second right bridge arm, namely the voltage value of the third DC voltage source;R1 stands for the resistance of the main windings;R2 stands for the resistance of the secondary windings;L1 stands for the inductance of the main windings;L2 stands for the inductance of the secondary windings;M stands for the mutual inductance between the main windings and the secondary windings;Kf1 stands for the thrust coefficient of the main windings;Kf2 stands for the thrust coefficient of the secondary windings; andD stands for the duty ratio of the switch of the dual-power drive circuit.