Xerox Corporation

Kenneth W Cocksedge

Andrew Gabor

A phase-sensitive transducer apparatus comprises first and second relatively movable members, the first relatively movable member having a plurality of windings and the second relatively movable member having a winding. Means are included for applying a first input signal to one of the windings of the first relatively movable member and a second input signal to another of the windings of the first relatively movable member, an output signal being induced on the winding of the second relatively movable member. The first and second input signals are sinusoidal in nature of substantially identical frequency and peak amplitude and are phase-displaced by a predetermined amount, and the output signal is substantially constant in peak amplitude and variable in phase during relative movement of the first and second relatively movable members. The apparatus further comprises means coupled to the winding of the second relatively movable member for squaring the output signal, means coupled to the means for squaring for demodulating the squared output signal to derive a pulse signal of constant peak amplitude and variable pulse width as the first and second relatively movable members are moved relative to one another, means coupled to the means for demodulating for integrating the phase signal to derive a position signal indicative of the relative movement of the first and second relatively rotatable members, the position signal alternating during such relative movement substantially between a supply voltage and a reference voltage, and means coupled to the means for integrating for offsetting the position signal so that it is substantially balanced about the reference voltage.

Phase-sensitive transducer apparatus with signal offset means

A phase-sensitive transducer apparatus comprises first and second relatively movable members wherein the first relatively movable member has a plurality of windings and the second relatively movable member has a winding. Means are included for applying a first input signal to one of the windings of the first relatively movable member and a second input signal to another of the windings of the first relative movable member. An output signal is induced on the winding of the second relatively movable member. The first and second input signals are sinusoidal in nature of substantially identical frequency and peak amplitude and are phase-displaced by a predetermined amount, and the output signal is substantially constant in peak amplitude and variable in phase during relative movement of the first and second relatively movable members. The means for applying comprises clock means for generating a clock signal at a clock frequency, means coupled to the clock means and responsive to the clock signal for generating a plurality of mutually phase-displaced square-wave signals of substantially identical frequency and peak amplitude, means coupled to the means for generating and responsive to a first group of the plurality of square-wave signals for deriving the first input signal and responsive to a second group of the plurality of square-wave signals different from the first group for deriving the second input signal, and means for coupling the first and second input signals to the respective windings of the first relatively movable member.

Phase-sensitive transducer apparatus

Method and apparatus for accurately positioning a blank angular position transducer element for boring at its center. A relatively high frequency carrier signal is applied to the blank transducer element to be bored and is thereby induced in a master rotor element which is rotated at a constant speed in an operative relationship with the blank. The rotor is made deliberately eccentric with respect to its axis of rotation, and the induced signal contains a carrier signal, a component indicative of relative angular position, and a once-per-revolution eccentricity error component, if the blank element is also eccentric with respect to the axis of rotation. Error detection circuitry isolates the once-per-revolution eccentricity error component, and resolution circuitry resolves it into x and y directions for application to error display devices, or to actuators connected to move the blank transducer element automatically until the x and y components are both zero. The blank element can then be bored by a tool movable along and rotable about the axis of rotation.

Growing community of inventors

Pleasanton, CA, United States of America

Kenneth W Cocksedge