Method of driving a two coordinate oscillator and circuit arrangement therefor

Claim 3

A circuit arrangement for driving a two coordinate mechanical oscillator with the aid of a deformed rotating field of forces defined by a plurality of exciting and pick-up components, the arrangement comprising: a. a plurality of pick-up transducers each to provide a respective electrical signal representative of the elongation of the mechanical oscillation in a respective one of the component directions; b. a plurality of amplifiers each having input means connected to output means of a corresponding one of the pick-up transducers; c. a plurality of phase shift networks each having input means connected to output means of a corresponding one of the amplifiers; d. a plurality of differential amplifiers each corresponding to a respective one of the pick-up transducers and each having first input means connected to output means of a corresponding one of the amplifiers and second input means connected to output means of the phase shift network corresponding to the preceding pick-up component in the cyclical sequence given by the deformed rotating electrical field; and e. a plurality of exciting transducers each having input means connected to output means of a corresponding one of the differential amplifiers to apply mechanical drive in the direction of the corresponding component of the mechanical oscillator.

Claim 4

A circuit arrangement for driving a two coordinate mechanical oscillator with the aid of a deformed rotating field of forces defined by a plurality of exciting and pick-up components, the arrangement comprising: a. a plurality of pick-up transducers each to provide a respective electrical signal representative of the elongation of the mechanical oscillation in a respective one of the component directions; b. a plurality of amplifiers each having input means connected to output means of a corresponding one of the pick-up transducers; c. a plurality of phase shift networks each having input means connected to output means of a corresponding one of the amplifiers; d. a plurality of differential amplifiers each corresponding to a respective one of the pick-up transducers and each having first input means connected to output means of a corresponding one of the amplifiers and second input means connected to output means of the phase shift network corresponding to the preceding pick-up component in the cyclical sequence given by the deformed rotating electrical field; and e. a plurality of exciting transducers each having input means connected to output means of a corresponding one of the differential amplifiers to apply mechanical drive in the direction of the corresponding component of the mechanical oscillator.

Claim 5

A circuit arrangement for driving a two coordinate mechanical oscillator with the aid of a deformed rotating field of forces defined by a plurality of exciting and pick-up components, the arrangement comprising: a. a plurality of pick-up transducers each to provide a respective electrical signal representative of the elongation of the mechanical oscillation in a respective one of the component directions; b. a plurality of amplifiers each having input means connected to output means of a corresponding one of the pick-up transducers; c. a plurality of phase shift networks each having input means connected to output means of a corresponding one of the amplifiers; d. a plurality of potential dividers each connected to output means of a corresponding one of the amplifiers; e. a plurality of differential amplifiers each corresponding to a respective one of the pick-up transducers and each having first input means connected to an intermediate point on a corresponding one of the potential dividers and second input means connected to output means of the phase shift network corresponding to the pick-up component in the cyclical sequence given by the deformed rotating electrical field; and f. a plurality of exciting transducers each having input means connected to output means of a corresponding one of the differential amplifiers to apply mechanical drive in the direction of the corresponding component of the mechanical oscillator.

Claim 6

A circuit arrangement for driving a two coordinate mechanical oscillator with the aid of a deformed rotating field of forces defined by a plurality of exciting and pick-up components, the arrangement comprising: a. a plurality of pick-up transducers each to provide a respective electrical signal representative of the elongation of the mechanical oscillation in a respective one of the component directions; b. a plurality of amplifiers each having input means connected to output means of a corresponding one of the pick-up transducers; c. a plurality of phase shift networks each having input means connected to output means of a corresponding one of the amplifiers; d. a plurality of potential dividers each connected to output means of a corresponding one of the amplifiers; e. a plurality of differential amplifiers each corresponding to a respective one of the pick-up transducers and each having first input means connected to an intermediate point on a corresponding one of the potential dividers and second input means connected to output means of the phase shift network corresponding to the pick-up component in the cyclical sequence given by the deformed rotating electrical field; and f. a plurality of exciting transducers each having input means connected to output means of a corresponding one of the differential amplifiers to apply mechanical drive in the direction of the corresponding component of the mechanical oscillator.

Claim 7

A circuit arrangement as claimed in claim 2, wherein the plurality of exciting and pick-up components comprise "n" equi-angularly spaced exciting and pick-up components, where n is any positive integer greater than one, and wherein each phase shift network is arranged to impart a phase shift equal to (180°/n ) to the electrical signal derived from the corresponding one of the first mentioned amplifiers.

Claim 8

A circuit arrangement as claimed in claim 2, wherein a rated amplitude regulator is connected between the output means of one of the phase shift networks and the first input means of the respectively associated differential amplifier.

Claim 9

A circuit arrangement as claimed in claim 5, wherein the amplitude regulator comprises a further differential amplifier having first input means connected to the output means of the one phase shift network and second input means connected to a source of fixed reference potential, circuit interrupter means having signal input means connected to the output means of the further differential amplifier, control input means connected to a direct voltage generator and signal output means connected to the first input means of the associated differential amplifier.

Claim 10

A circuit arrangement as claimed in claim 2, wherein each differential amplifier comprises an operational amplifier.