Abstract: A hydraulic displacement machine that can operate as a pump or a motor in connection with an electrorheologic or magnetorheologic fluid includes a housing, a rotary piston arranged to rotate within a chamber in the housing, at least one displacement vane provided on the rotary piston, a plurality of field generating elements such as capacitor plate segments and/or coil arrangements that are each individually electrically energizable and that are arranged on the two sidewalls of the housing chamber distributed around the circumferential direction, and an actuator connected to each field generating element so as to move the elements of each pair selectively closer together and farther apart from each other. By applying an appropriate electric or magnetic field to the electrorheologic or magnetorheologic fluid between the field generating elements, the fluid is locally solidified in the "flow mode" to form a stationary seal plug within each fluid chamber between respective consecutive vanes.
Type:
Grant
Filed:
November 10, 1998
Date of Patent:
November 21, 2000
Assignees:
Carl Schenk AG, Bayer AG
Inventors:
Andreas Pohl, Horst Rosenfeldt, Eckhardt Wendt, Klaus Buesing
Abstract: Analog signals representing the unbalance of a rotor in one or more planes extending perpendicularly and across the longitudinal rotational axis of said rotor, are first adapted prior to an analog to digital conversion. The adaptation takes place in response to at least one adaptation value, which is characteristic for the balancing, such as an attenuation, a sensitivity control, an rpm or measuring range selection and the like. The adapted signal is then combined with a reference signal having a frequency corresponding to the rpm of the rotor. The combined signal is subjected to an analog to digital conversion and then digitally displayed. The circuit arrangement for the performance of the signal adaptation, signal combination and signal display includes adaptation circuit means which are responsive to said adaptation value or values. The adaptation circuit means is connected to receive the unbalance information with the correct sign (+ or -).