Frequency of combining apparatus

Claim 1

An electrical apparatus for providing a signal which is indicative of the combined rotating speeds of two rotating devices comprising: a first nonmagnetic rotatable member connectable to one of said two rotating devices; a second nonmagnetic rotatable member axially spaced from said first rotatable member and connectable to the other of said two rotating devices, with said first and said second rotatable members being rotated about a common axis; a plurality of circumferentially spaced low reluctance magnetic elements disposed on said first and said second Rotatable members in mutual axially opposed and spaced apart relationship for periodic axial alignmnet for successively forming low reluctance magnetic circuit paths when said first and said second rotatable members are rotated; an inductance coil means adapted for connection to a source of high frequency signals that generate a magnetic field adjacent said inductance coil means; said inductance coil means being disposed axially adjacent said first and said second rotatable members so that said magnetic field is directed through said low reluctance magnetic circuit paths whereby the inductance of said coil is varied in response to the periodic axial alignmnet of said plurality of magnetic elements; and output terminals connected in circuit with said inductance coil means for providing said signal at a frequency responsive to the combined rate of rotation of said two rotating devices when said inductance coil is connected to said source of high frequency signals

Claim 5

An apparatus for producing electrical signals which are indicative of the combined speeds of first and second rotating devices, comprising: an annular inductance coil means; a first nonmagnetic rotatable support means adjacent one axial side of said inductance coil means and connected for rotation with said first rotating device; a plurality of first magnetic elements circumferentially facing said inductance coil means in uniformly arcuately spaced relationship on said first nonmagnetic rotatable support means; a second nonmagnetic rotatable support means adjacent the opposite axial side of said inductance coil means and connected for rotation with said second rotating device; a second magnetic element facing said inductance coil means in a radially disposed relationship therewith on said second rotatable support means and being complementary to each of said plurality of first magnetic elements for periodically aligning and magnetically coacting with each of said plurality of first magnetic elements for successively forming low reluctance magnetic circuit paths which vary the impedance of said inductance coil means in response to relative rotation between said fiRst and said second support means; a source of alternating current signals connected to said inductance coil means; and a detector circuit means coupled to said source of alternating current signals and responsive to variations produced in said alternating current signals by variation of the impedance of said inductance coil means, whereby said detector circuit means develops pulse signals having an output frequency which provides an indication of the combined speeds of said first and said second rotating devices. 4. An apparatus for producing electrical signals which are responsive to the combined rotating speeds of two rotating devices, comprising: a stationary mounted inductance coil means; first and second nonmagnetic discs axially aligned with each other and with the center axis of said inductance coil means; said first nonmagnetic disc including a plurality of radially disposed and cicumferentially spaced ferrite bar elements; said second disc including at least one C-shaped ferrite core element having ends thereof extending toward said first disc and the center opening of the C-shaped core element including said inductance coil means; means connecting said first nonmagnetic disc for rotation by one of said rotating devices; means connecting said second nonmagnetic disc for rotation by said second rotating device whereby said inductance coil means has portions thereof substantially enclosed by the mutual alignment of said C-shaped ferrite element and one of said ferrite bar elements such that low reluctance magnetic circuit paths being periodically formed by the respective motion of said first and said second discs to thereby periodically very the inductance of said inductance coil means; and a frequency sensing means including a carrier oscillator circuit and a tuned resonant circuit including said inductance coil means, said carrier oscillator circuit and said tuned resonant circuit connected together that such amplitude modulated electrical signals are developed in accordance with said periodic variations of inductance of said inductance coil means whereby the frequency at which said amplitude modulated signals are produced is determined by the number of said plurality of ferrite bar elements included in said first disc and the combined speeds of said first and said second rotating devices. eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Claim 6

An apparatus for producing electrical signals which are indicative of the combined speeds of first and second rotating devices, comprising: an annular inductance coil means; a first nonmagnetic rotatable support means adjacent one axial side of said inductance coil means and connected for rotation with said first rotating device; a plurality of first magnetic elements circumferentially facing said inductance coil means in uniformly arcuately spaced relationship on said first nonmagnetic rotatable support means; a second nonmagnetic rotatable support means adjacent the opposite axial side of said inductance coil means and connected for rotation with said second rotating device; a second magnetic element facing said inductance coil means in a radially disposed relationship therewith on said second rotatable support means and being complementary to each of said plurality of first magnetic elements for periodically aligning and magnetically coacting with each of said plurality of first magnetic elements for successively forming low reluctance magnetic circuit paths which vary the impedance of said inductance coil means in response to relative rotation between said fiRst and said second support means; a source of alternating current signals connected to said inductance coil means; and a detector circuit means coupled to said source of alternating current signals and responsive to variations produced in said alternating current signals by variation of the impedance of said inductance coil means, whereby said detector circuit means develops pulse signals having an output frequency which provides an indication of the combined speeds of said first and said second rotating devices. 4. An apparatus for producing electrical signals which are responsive to the combined rotating speeds of two rotating devices, comprising: a stationary mounted inductance coil means; first and second nonmagnetic discs axially aligned with each other and with the center axis of said inductance coil means; said first nonmagnetic disc including a plurality of radially disposed and cicumferentially spaced ferrite bar elements; said second disc including at least one C-shaped ferrite core element having ends thereof extending toward said first disc and the center opening of the C-shaped core element including said inductance coil means; means connecting said first nonmagnetic disc for rotation by one of said rotating devices; means connecting said second nonmagnetic disc for rotation by said second rotating device whereby said inductance coil means has portions thereof substantially enclosed by the mutual alignment of said C-shaped ferrite element and one of said ferrite bar elements such that low reluctance magnetic circuit paths being periodically formed by the respective motion of said first and said second discs to thereby periodically very the inductance of said inductance coil means; and a frequency sensing means including a carrier oscillator circuit and a tuned resonant circuit including said inductance coil means, said carrier oscillator circuit and said tuned resonant circuit connected together that such amplitude modulated electrical signals are developed in accordance with said periodic variations of inductance of said inductance coil means whereby the frequency at which said amplitude modulated signals are produced is determined by the number of said plurality of ferrite bar elements included in said first disc and the combined speeds of said first and said second rotating devices. eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee