Abstract
This paper describes the step response characteristics of a hydrostatic thrust bearing with an actively-controlled restrictor using a voice coil motor (VCM). This new type of restrictor can control the mass flow rate through the restrictor by using both the balance of the fluid forces exerted on the disk and the electromagnetic force of VCM. The floating disk is controlled by VCM through PI controller according to the shaft displacement. The effects of various design parameters on the step response characteristics are investigated theoretically and experimentally. It was shown that the proposed bearing could remarkably reduce the settling time of the shaft after the step load was imposed.
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