US3045227A - Electromagnetic devices for converting a movement of an electric value - Google Patents

Electromagnetic devices for converting a movement of an electric value Download PDF

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US3045227A
US3045227A US777779A US77777958A US3045227A US 3045227 A US3045227 A US 3045227A US 777779 A US777779 A US 777779A US 77777958 A US77777958 A US 77777958A US 3045227 A US3045227 A US 3045227A
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rotor
magnetic
movement
flux
organ
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US777779A
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Minas Giorgio
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G05B1/01—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
    • G05B1/02—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals
    • G05B1/025—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals using inductance means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core

Definitions

  • temperatures are transformed into the movement of a mercury column or of a bimetal body; barometric pressures into the movement of flexible diaphragms; the magnetic phenomena into movement of magnetic needles; the time into the movement of clock hands, and so on, and the electrical signals for practical purposes are converted into the movement of an indicator needle or the like.
  • the majority of these instruments execute their movement by utilizing the motion of a torsion couple. The action decreasing down to a minimum value at the points of equilibrium.
  • a principal object of the present invention is to determine with certainty various movement phenomena without substantially interfering with them by corresponding reaction phenomena.
  • the method and apparatus for converting a movement into an electrical value is characterized in that in an alternating magnetic flux, suitably generated, there is placed, so as to be capable of moving in dependence of the movement to be converted into electrical value, an organ mechanically independent of the other portions of the group.
  • the magnetic resistance of the organ is variable according to its position Within the flux, and is characterized in that an electromagnetic receiving group, separated therefrom, is capable of being influenced by the variable flux derived from the said organ due to its movements.
  • the method and apparatus for carrying out the invention is also characterized in that the variability in the magnetic resistance of the-movable organ is produced in the alternating magnetic flux by the shape of the magnetic mass of this organ or a magnetic component connected to it or forming a part of it.
  • the device to realize the above method is characterized by an organ or rotor rotatable within a revolving magnetic flux or field generated in a suitable manner the rotor has different magnetic resistance values in its various directions or angular positions.
  • the above device is also characterized in that the organ rotatable within a revolving magnetic flux is of a laminated construction and comprises two parts, one of which is made of magnetic material and is irregular with respect to an axis perpendicular to the magnetic surface.
  • the device is still further characterized in that the design of the magnetic part constituting the movable organ or rotor is selected such that each position which said organ assumes, corresponds to a specific and well defined electrical value obtained by conversion.
  • the device is also characterized in that the rotor rotated within a magnetic flux rotates in the flux and is statically and dynamically balanced with respect to the rotation axis.
  • a feature of the device is that the magnetic flux, within which the movable organ or rotor moves is a unilaterally directed and linear alternating flux.
  • the magnetic flux, within which the movable organ is displaced is an alternating rotary flux.
  • the electromagnetic unit or pick-oil means develop a signal with variable value according to the posit-ions assumed by the rotor and the pick-off means does not enclose the rotor but is arranged latera-lly to the latter in a perpendicular direction to the linear or rotary alternating flux, in which the rotor is displaced.
  • the device is likewise characterized in that the movable organ or rotor is enclosed in a casing, container or box of any shape.
  • the said organ constitutes a unit by itself and independent of the mechanical construction of the magnetic circuit, and not necessarily attached to external mechanical elements.
  • the device in one of its embodiments is finally charac terized in that the movable organ enclosed in a casing, container or box of its own, is immersed in a gas or liquid capable of attenuating the oscillations of the organ.
  • FIGS. 1, 2, 3 and 4 elevation views of magnetic organs or rotors of laminar-type, discoidal in shape and comprising magnetic materials of difierent shapes;
  • FIG. 5 is a diagrammatic view of one of the organs or discoidal rotors of FIGS. 1-4 disposed in a singlephase electromagnetic flux;
  • FIG. 6 is a diagrammatic view of one of the organs or discoidal rotors illustrated as surrounded by a multiphase electromagnetic fiux according to the invention
  • FIG. 7 is a diagram of the elements in FIG. 5 with the organ or magnetic discoidal rotor shown in section in conjunction with stationary pick-off means arranged laterally to the rotor.
  • FIG. 1 in which is illustrated a laminar-type organ or discoidal rotor 1 having a pole-piece of magnetic material 2, suitably shaped according to a desired type of signal to be developed as hereafter described, and made of non-magnetic material 3 of sufiicient thickness to statically and dynamically balance the pole-piece of magnetic material which is not a regular and symmetrical shape With respect to the axis 4 of rotation about which rotor 1 rotates. The function of this axis is primarily to mechanically support the rotor. It is not necessary for this axis to be connected to other instruments, for the motion may be transmitted to the discoidal rotor 1 through a magnetic field, fluid, thermal and similar forces.
  • stator electrical single-phase winding 5 comprising a pair of stator coils disposed angularly spaced radially of the rotor 1 or through a three-phase winding 6 or multiphase windings of a stator a unilaterally directed linear or rotary magnetic flux which strikes the magnetic portion 2 of the rotor 1, and is thus guided and conveyed towards stationary pick-oil means comprising central elongated core 7 of magnetic permeable material, about which is wound an electrical conductor or secondary winding 8.
  • the axis of the pick-oil means is arranged on the ideal projection of the rotation axis 4 of discoidal rotor 1, with suitable separation or air gap therebetween and without any mechanical connection with the rotor 1.
  • a casing, container or box 9 illustrated diagrammatically by broken lines containing a gas or liquid houses the rotor and damps its rotary movement and oscillations.
  • the arrangement above described comprises an improved transducer which operates as follows: Alternating current is applied to the electrical windings 5, 6 to induce a unilaterally directed linear or rotary or revolving mag netic flux field which impinges on the magnetic portion or sector pole-piece 2 of the rotor 1 which, according to its angular position with respect to the magnetic portion or sector pole-piece sends out towards the stationary pick-off means, a variable or modulated magnetic flux which is picked up by the conductor 8 of the pick-oil means and converted into a sinusoidal signal which is an amplitude or phase or frequency modulated electric signal.
  • the amplitude of the electric signals is determined by the shape of the magnetic portion 2 of rotor 1 according to its position, and the modulation of the electric signals is dependent on the angle formed by discoidal element or rotor 1 on the plane orthogonal to the rotation axis 4.
  • the winding of the stator or the secondary winding may be energized with alternating current alternatively to induce in the other of the windings on a deenergized condition a sinusoidal signal having a phase angle representative of the variations of the physical phenomenon.
  • a transducer comprising, a rotor rotatably driven in operation about an axis through 360 in response to a physical phenomenon and driven variably in response to variations of the physical phenomenon, a stator having at least a pair of electrically connected angular spaced coils disposed radially of said rotor forming a primary winding having an axis normal to said rotor axis and energizable in operation for producing a revolving flux field in which said rotor revolves, stationary pickoff means spaced from said rotor for developing a sinusoidal signal comprising a secondary winding disposed perpendicular to the axis of said primary winding in which said sinusoidal signal is developed and having a permeable elongated core disposed'coaxial with the rotor and axially spaced therefrom, said rotor having means ,for modulating the flux lines in said revolving field and inducing said sinusoidal signal in said secondary winding through said permeable core comprising a magnetic sector pole
  • a transducer comprising, a rotor rotatably driven in operation about an axis through 360 in response to a physical phenomenon and driven variably in response to variations of the physical phenomenon, a stator having at least a pair of electrically connected angularly spaced coils disposed radially of said rotor forming a first winding having an axis normal to said rotor axis, stationary pick-off means spaced from said rotor for developing a sinusoidal signal comprising a second winding disposed perpendicular to the axis of said first winding, and having a permeable elongated core disposed coaxial with the rotor and axially spaced therefrom, said rotor having a magnetic sector pole piece disposed for rotation coaxially with said second winding and said core and having a configuration assymetrical with the axis of said second winding and said permeable core, and connections on said first winding and connections on said second winding for alternatively energizing either of said windings

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Description

July 17, 1962 G. MINAS ROMAGNETIC DEVICES F OF d D CONVERTING C C VALUE 1958 ELECT A MOVEMENT File 3,045,227 Patented July 17, 1962 ice , 3,045,227 ELECTROMAGNETIC DEVICES FOR CONVERT- ING A MOVEMENT OF AN ELECTRIC VALUE Giorgio Minas, Viale Causa 4/3, Genoa, Italy Filed Dec. 2, 1958, Ser. No. 777,779 Claims priority, application Italy Jan. 27, 1958 2 Claims. (Cl. 340-345) One of the most important functions of modern instruments is the immediate correction or control of the course of a variable function. To obtain prompt corrections and positive control, the changes occurring in the operation have to be made recogi-nzable by converting them into a value which may be easily measured, transmitted or modified. The present progress of electronic technology and the various possibilities this technology may offer, since very many operations which have to be controlled are generated, directly or indirectly, by the movement of a solid, a fluid, or gaseous bodies, has required development of and investigation of devices by means of which the task of converting this motion into an electrical value can be performed.
A considerable amount of phenomena is at present transformed into motion for practical reasons, and devices have been manufactured for this purpose and later improved by experience and world-wide use for their eiliciency.
For example, temperatures are transformed into the movement of a mercury column or of a bimetal body; barometric pressures into the movement of flexible diaphragms; the magnetic phenomena into movement of magnetic needles; the time into the movement of clock hands, and so on, and the electrical signals for practical purposes are converted into the movement of an indicator needle or the like. The majority of these instruments execute their movement by utilizing the motion of a torsion couple. The action decreasing down to a minimum value at the points of equilibrium.
A principal object of the present invention is to determine with certainty various movement phenomena without substantially interfering with them by corresponding reaction phenomena.
The method and apparatus for converting a movement into an electrical value according to the present invention, is characterized in that in an alternating magnetic flux, suitably generated, there is placed, so as to be capable of moving in dependence of the movement to be converted into electrical value, an organ mechanically independent of the other portions of the group. The magnetic resistance of the organ is variable according to its position Within the flux, and is characterized in that an electromagnetic receiving group, separated therefrom, is capable of being influenced by the variable flux derived from the said organ due to its movements. The method and apparatus for carrying out the invention is also characterized in that the variability in the magnetic resistance of the-movable organ is produced in the alternating magnetic flux by the shape of the magnetic mass of this organ or a magnetic component connected to it or forming a part of it.
The device to realize the above method is characterized by an organ or rotor rotatable within a revolving magnetic flux or field generated in a suitable manner the rotor has different magnetic resistance values in its various directions or angular positions.
The above device is also characterized in that the organ rotatable within a revolving magnetic flux is of a laminated construction and comprises two parts, one of which is made of magnetic material and is irregular with respect to an axis perpendicular to the magnetic surface.
The device is still further characterized in that the design of the magnetic part constituting the movable organ or rotor is selected such that each position which said organ assumes, corresponds to a specific and well defined electrical value obtained by conversion.
The device is also characterized in that the rotor rotated within a magnetic flux rotates in the flux and is statically and dynamically balanced with respect to the rotation axis.
A feature of the device is that the magnetic flux, within which the movable organ or rotor moves is a unilaterally directed and linear alternating flux.
Another feature of the device is that the magnetic flux, within which the movable organ is displaced is an alternating rotary flux.
Another feature is that the electromagnetic unit or pick-oil means develop a signal with variable value according to the posit-ions assumed by the rotor and the pick-off means does not enclose the rotor but is arranged latera-lly to the latter in a perpendicular direction to the linear or rotary alternating flux, in which the rotor is displaced.
The device is likewise characterized in that the movable organ or rotor is enclosed in a casing, container or box of any shape. The said organ constitutes a unit by itself and independent of the mechanical construction of the magnetic circuit, and not necessarily attached to external mechanical elements.
The device in one of its embodiments is finally charac terized in that the movable organ enclosed in a casing, container or box of its own, is immersed in a gas or liquid capable of attenuating the oscillations of the organ.
Some embodiments of the present invention will be shown diagrammatically and by only way of example in the annexed drawings.
FIGS. 1, 2, 3 and 4, elevation views of magnetic organs or rotors of laminar-type, discoidal in shape and comprising magnetic materials of difierent shapes;
FIG. 5 is a diagrammatic view of one of the organs or discoidal rotors of FIGS. 1-4 disposed in a singlephase electromagnetic flux;
FIG. 6 is a diagrammatic view of one of the organs or discoidal rotors illustrated as surrounded by a multiphase electromagnetic fiux according to the invention;
FIG. 7 is a diagram of the elements in FIG. 5 with the organ or magnetic discoidal rotor shown in section in conjunction with stationary pick-off means arranged laterally to the rotor.
Referring to the drawings and more particularly to FIG. 1 in which is illustrated a laminar-type organ or discoidal rotor 1 having a pole-piece of magnetic material 2, suitably shaped according to a desired type of signal to be developed as hereafter described, and made of non-magnetic material 3 of sufiicient thickness to statically and dynamically balance the pole-piece of magnetic material which is not a regular and symmetrical shape With respect to the axis 4 of rotation about which rotor 1 rotates. The function of this axis is primarily to mechanically support the rotor. It is not necessary for this axis to be connected to other instruments, for the motion may be transmitted to the discoidal rotor 1 through a magnetic field, fluid, thermal and similar forces. Thus the rotor 1 is rotated through 360 in response to a physical phenomenon and driven variably in response to variations of the physical phenomenon. Perpendicular to the rotation axis 4, and thus perpendicular to the rotating circular surface of element 1, there is induced, through a stator electrical single-phase winding 5 comprising a pair of stator coils disposed angularly spaced radially of the rotor 1 or through a three-phase winding 6 or multiphase windings of a stator a unilaterally directed linear or rotary magnetic flux which strikes the magnetic portion 2 of the rotor 1, and is thus guided and conveyed towards stationary pick-oil means comprising central elongated core 7 of magnetic permeable material, about which is wound an electrical conductor or secondary winding 8. The axis of the pick-oil means is arranged on the ideal projection of the rotation axis 4 of discoidal rotor 1, with suitable separation or air gap therebetween and without any mechanical connection with the rotor 1. A casing, container or box 9 illustrated diagrammatically by broken lines containing a gas or liquid houses the rotor and damps its rotary movement and oscillations.
The arrangement above described comprises an improved transducer which operates as follows: Alternating current is applied to the electrical windings 5, 6 to induce a unilaterally directed linear or rotary or revolving mag netic flux field which impinges on the magnetic portion or sector pole-piece 2 of the rotor 1 which, according to its angular position with respect to the magnetic portion or sector pole-piece sends out towards the stationary pick-off means, a variable or modulated magnetic flux which is picked up by the conductor 8 of the pick-oil means and converted into a sinusoidal signal which is an amplitude or phase or frequency modulated electric signal. The amplitude of the electric signals is determined by the shape of the magnetic portion 2 of rotor 1 according to its position, and the modulation of the electric signals is dependent on the angle formed by discoidal element or rotor 1 on the plane orthogonal to the rotation axis 4.
It is to be understood that the winding of the stator or the secondary winding may be energized with alternating current alternatively to induce in the other of the windings on a deenergized condition a sinusoidal signal having a phase angle representative of the variations of the physical phenomenon.
The present invention has been shown with respect to several embodiments. Many modifications and variations may be made in embodying the invention, for example either the shape and profile of the magnetic portion of therotor or the pick-01f means may be changed.
What I claim is:
1. A transducer comprising, a rotor rotatably driven in operation about an axis through 360 in response to a physical phenomenon and driven variably in response to variations of the physical phenomenon, a stator having at least a pair of electrically connected angular spaced coils disposed radially of said rotor forming a primary winding having an axis normal to said rotor axis and energizable in operation for producing a revolving flux field in which said rotor revolves, stationary pickoff means spaced from said rotor for developing a sinusoidal signal comprising a secondary winding disposed perpendicular to the axis of said primary winding in which said sinusoidal signal is developed and having a permeable elongated core disposed'coaxial with the rotor and axially spaced therefrom, said rotor having means ,for modulating the flux lines in said revolving field and inducing said sinusoidal signal in said secondary winding through said permeable core comprising a magnetic sector pole piece disposed for rotation coaxially with said secondary winding and said core and having a configuration assymetrical with the axis of said secondary winding for applying modulated flux to said permeable core thereby to induce in said secondary winding said sinusoidal signal at a constant amplitude.
2. A transducer comprising, a rotor rotatably driven in operation about an axis through 360 in response to a physical phenomenon and driven variably in response to variations of the physical phenomenon, a stator having at least a pair of electrically connected angularly spaced coils disposed radially of said rotor forming a first winding having an axis normal to said rotor axis, stationary pick-off means spaced from said rotor for developing a sinusoidal signal comprising a second winding disposed perpendicular to the axis of said first winding, and having a permeable elongated core disposed coaxial with the rotor and axially spaced therefrom, said rotor having a magnetic sector pole piece disposed for rotation coaxially with said second winding and said core and having a configuration assymetrical with the axis of said second winding and said permeable core, and connections on said first winding and connections on said second winding for alternatively energizing either of said windings with alternating current thereby to induce in the other of said windings in a de-energized condition a sinusoidal signal having a phase angle representative of the variations of said physical phenomenon.
References Cited in the tile of this patent UNITED STATES PATENTS 1,128,088 Kramer et al. Feb. 9, 1915 1,171,480 Troll Feb. 15, 1916 1,743,853 Harrison Jan. 14, 1930 2,052,382 Dallmann Aug. 25, 1936 2,185,767 Jefieries Jan. 2, 1940 2,365,430 Navl Dec. 19, 1944 2,452,862 Nefi Nov. 2, 1948 2,484,022 Esval Oct. 11, 1949 2,486,641 Gilbert Nov. 1, 1949 2,494,493 Schaevitz Jan. 10, 1950 2,536,805 Hansen Jan. 2, 1951 2,564,018 Malmqvist Aug. 14, 1951 2,621,314 Wendt Dec. 9, 1952 2,692,357 Nilson Oct. 19, 1954 2,774,057 Jones Dec. 11, 1956 FOREIGN PATENTS 888,663 Germany Sept. 3, 1953 879,311 France Feb. 19, 1943
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3398386A (en) * 1965-04-20 1968-08-20 Frederick A. Summerlin Electrical synchro having one surface of the rotor inclined
WO1988006716A1 (en) * 1987-02-27 1988-09-07 Radiodetection Limited Inductive displacement sensors
WO1990004152A1 (en) * 1988-10-11 1990-04-19 Radiodetection Limited Homopolar inductive displacement sensor
US5323109A (en) * 1991-04-26 1994-06-21 Walter Mehnert Inductive position indicator for monitoring the relative positions of two mutually movable bodies
EP0624779A1 (en) * 1993-05-10 1994-11-17 Delco Electronics Corporation Device for measuring the angular position of a rotor
US5475302A (en) * 1991-08-16 1995-12-12 Walter Mehnert Inductive pick-up for producing a signal representing the relative positions of two mutually movable bodies
DE4429311A1 (en) * 1994-08-18 1996-02-22 Daimler Benz Ag Test device for vehicles with magnetic field sensitive wheel speed sensor
US5637997A (en) * 1991-11-07 1997-06-10 Radiodetection Limited Angular displacement sensor with movable inductance affecting component
WO2010099770A1 (en) * 2009-03-02 2010-09-10 Micro-Epsilon Messtechnik Gmbh & Co. Kg Position sensor

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JPS5570744A (en) * 1978-11-23 1980-05-28 Nippon Soken Inc Detector for revolution

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US1171480A (en) * 1910-07-14 1916-02-15 Loadometer Company Electrical fluid-pressure indicator.
US1743853A (en) * 1925-12-29 1930-01-14 Brown Instr Co Meter
US2052382A (en) * 1935-02-04 1936-08-25 Charles M Coaltrin Burial casket
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FR879311A (en) * 1941-02-14 1943-02-19 Licentia Gmbh Inductive comparison system for adjusting a rotating axis
US2365430A (en) * 1942-09-02 1944-12-19 James M Naul Telemetering instrument
US2452862A (en) * 1945-10-19 1948-11-02 Jack & Heintz Prec Ind Inc Electric gauging head
US2484022A (en) * 1945-03-27 1949-10-11 Sperry Corp Pick-off device for electrical control systems
US2486641A (en) * 1944-10-14 1949-11-01 Weston Electrical Instr Corp Measuring and control apparatus
US2494493A (en) * 1948-08-24 1950-01-10 Schaevitz Herman Differential transformer
US2536805A (en) * 1947-08-16 1951-01-02 Gen Electric Hall effect telemetering transmitter
US2564018A (en) * 1944-02-29 1951-08-14 Bolidens Gruv Ab Inductive angle indicator
US2621314A (en) * 1950-11-07 1952-12-09 Gen Electric Transmission system
DE888663C (en) * 1934-03-02 1953-09-03 Aeg Circuit arrangement for the electrical remote transmission of measured quantities with a feedback-free transmitter
US2692357A (en) * 1953-04-21 1954-10-19 Hays Corp Electrical system for remote transmission of mechanical movements
US2774057A (en) * 1953-10-29 1956-12-11 Detroit Controls Corp Magnetic modulator

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US1171480A (en) * 1910-07-14 1916-02-15 Loadometer Company Electrical fluid-pressure indicator.
US1128088A (en) * 1914-03-06 1915-02-09 Vio Albert Asplund Attachment for steering-wheels.
US1743853A (en) * 1925-12-29 1930-01-14 Brown Instr Co Meter
DE888663C (en) * 1934-03-02 1953-09-03 Aeg Circuit arrangement for the electrical remote transmission of measured quantities with a feedback-free transmitter
US2185767A (en) * 1934-12-24 1940-01-02 Ernest S Jefferies Measuring and integrating device
US2052382A (en) * 1935-02-04 1936-08-25 Charles M Coaltrin Burial casket
FR879311A (en) * 1941-02-14 1943-02-19 Licentia Gmbh Inductive comparison system for adjusting a rotating axis
US2365430A (en) * 1942-09-02 1944-12-19 James M Naul Telemetering instrument
US2564018A (en) * 1944-02-29 1951-08-14 Bolidens Gruv Ab Inductive angle indicator
US2486641A (en) * 1944-10-14 1949-11-01 Weston Electrical Instr Corp Measuring and control apparatus
US2484022A (en) * 1945-03-27 1949-10-11 Sperry Corp Pick-off device for electrical control systems
US2452862A (en) * 1945-10-19 1948-11-02 Jack & Heintz Prec Ind Inc Electric gauging head
US2536805A (en) * 1947-08-16 1951-01-02 Gen Electric Hall effect telemetering transmitter
US2494493A (en) * 1948-08-24 1950-01-10 Schaevitz Herman Differential transformer
US2621314A (en) * 1950-11-07 1952-12-09 Gen Electric Transmission system
US2692357A (en) * 1953-04-21 1954-10-19 Hays Corp Electrical system for remote transmission of mechanical movements
US2774057A (en) * 1953-10-29 1956-12-11 Detroit Controls Corp Magnetic modulator

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3398386A (en) * 1965-04-20 1968-08-20 Frederick A. Summerlin Electrical synchro having one surface of the rotor inclined
WO1988006716A1 (en) * 1987-02-27 1988-09-07 Radiodetection Limited Inductive displacement sensors
GB2223590A (en) * 1987-02-27 1990-04-11 Radiodetection Ltd Inductive displacement sensors
GB2223590B (en) * 1987-02-27 1990-11-14 Radiodetection Ltd Inductive displacement sensors
WO1990004152A1 (en) * 1988-10-11 1990-04-19 Radiodetection Limited Homopolar inductive displacement sensor
GB2241788A (en) * 1988-10-11 1991-09-11 Radiodetection Ltd Homopolar inductive displacement sensor
US5214378A (en) * 1988-10-11 1993-05-25 Radiodetection Limited Homopolar inductive displacement sensor
US5323109A (en) * 1991-04-26 1994-06-21 Walter Mehnert Inductive position indicator for monitoring the relative positions of two mutually movable bodies
US5475302A (en) * 1991-08-16 1995-12-12 Walter Mehnert Inductive pick-up for producing a signal representing the relative positions of two mutually movable bodies
US5637997A (en) * 1991-11-07 1997-06-10 Radiodetection Limited Angular displacement sensor with movable inductance affecting component
US5489842A (en) * 1993-05-10 1996-02-06 Delco Electronics Corporation Method and apparatus for determining the rotational position of a magnetic rotor relative to current carrying coils utilizing magnetic coupling between coils
EP0624779A1 (en) * 1993-05-10 1994-11-17 Delco Electronics Corporation Device for measuring the angular position of a rotor
DE4429311A1 (en) * 1994-08-18 1996-02-22 Daimler Benz Ag Test device for vehicles with magnetic field sensitive wheel speed sensor
DE4429311C2 (en) * 1994-08-18 1998-05-20 Daimler Benz Ag Test device for vehicles with magnetic field sensitive wheel speed sensor
WO2010099770A1 (en) * 2009-03-02 2010-09-10 Micro-Epsilon Messtechnik Gmbh & Co. Kg Position sensor
JP2012519287A (en) * 2009-03-02 2012-08-23 マイクロ−エプシロン・メステヒニク・ゲーエムベーハー・ウント・コンパニー・カー・ゲー Position sensor
US8941389B2 (en) 2009-03-02 2015-01-27 Micro-Epsilon Messtechnik Gmbh & Co. Kg Position sensor

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DE1140716B (en) 1962-12-06
FR1213362A (en) 1960-03-31

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