Class 340/870.35 - Differential type

Subclass of Class 340 - Communications: electrical
Definition: Subject matter in which the mutual inductance contains two
No. of patents: 35
Last issue date: 06/13/2006

Number	Title	Issue Date
7061230	Circuit and method for measuring distances A circuit for measuring distances and which has at least two inputs (1, 2), at least one measuring coil (3), and at least one signal source, wherein at least two input signals (epos, eneg) are generated by means of the signal sour...	06/13/2006
6901654	Method of fabricating a coil and clamp for variable reluctance transducer Improved coils and clamps for variable reluctance sensors are disclosed. A method of fabricating a discrete coil involves providing a conductor wound in a coil on a tube. The coil has a coil outer surface that has insulation. A window is opened in the insulation on ...	06/07/2005
6243023	Encoder and parameter establishing device therefor An encoder comprises position detecting device for detecting a magnetic pole position and a rotational position of a motor. The encoder also includes a memory portion for storing parameter information particular to the motor or the position detecting devi...	06/05/2001
5815089	Device for transmitting signals from position detector and method of such signal transmission A transmitting device, for transmitting position detector signals, comprises a controller for processing signals on various kinds of data from an object of interest; a position detector that has a magnetic pole detecting portion and which detects position...	09/29/1998
5625353	Device for transmitting signals from position detector and method of such signal transmission A transmitting device, for transmitting position detector signals, comprises a controller for processing signals on various kinds of data from an object of interest; a position detector that has a magnetic pole detecting portion and which detects position...	04/29/1997
5521496	Detection circuits for position sensors A detection circuit for a position sensor has drive circuitry 3 connected to two impedance elements 1a, 1b having an impedance which varies in dependence on the position of a movable member, so as to provide an oscillating signal dependant on the position...	05/28/1996
5497147	Differential variable reluctance transducer The novel differential variable reluctance transducer and telemetry system is comprised of a ultra miniaturized device encased in stainless steel. The system contains a free sliding, magnetically permeable, stainless core and two coils surrounding the cor...	03/05/1996
5382899	Position detecting and time measuring device providing measurement finer than a clock signal period First absolute position detecting section generates an A.C. output signal having a phase electrically shifted in accordance with a position of a moving object, and samples a counted value of a counter circuit in response to an electrical phase change at a...	01/17/1995
5280238	System for processing position signals that are reponsive to displacement of an object In a system for processing signals responsive to the position of an object, a pair of position sensors are mounted to produce sinusoidal wave signals corresponding to positioning scale markings on the object. The output of the sensors are pulse-width modu...	01/18/1994
5223830	Sensor circuit A sensor circuit has a measuring circuit in which measuring signals occur at two different circuit points and signals at one point change oppositely to signals at the other point during changing of measuring values, and an evaluating circuit for evaluatin...	06/29/1993
5218295	System for processing position signals to improve resolution of the position of an object System for processing fine position signals pulse-width modulates signals from two magnetic sensors for producing sinusoidal wave signals different from each other in phase by a quarter cycle in correspondence with the scale pitches, then switches the pha...	06/08/1993
5204674	Servo mechanism with differential phase shift feedback A position sensor which can be incorporated into a positional feedback-type servo mechanism includes a mechanical sensor element, an oscillator and first and second phase shifters, which in the disclosed embodiment are variable capacitors. The phase shift...	04/20/1993
5175541	Evaluating circuit for inductive displacement pickup An evaluating circuit for an inductive pickup has a rectangular signal generator for outputing a rectangular signal, a driver stage for supplying a displaement pickup with an input signal produced from the rectangular signal, a phase-coupled rectifier ope...	12/29/1992
5027853	Limit switch replacement system and universal bracket Apparatus which monitors the extent to which a mechanical valve (2) is opened which employs a rotary position transducer (5). The rotary position transducer (4) provides a signal representative of valve (2) position to a signal processor (10, 140 for anal...	07/02/1991
5010298	Variable inductance displacement measuring device with slidable metal sleeve and ferrite bead core A displacement measuring apparatus including a variable inductance coil formed of a pair of coils, on a core of predetermined length made of a material having high magnetic permeability. The pair of coils are disposed on a core adjacent to each other in t...	04/23/1991
4965547	Signal converter circuit A circuit which converts one parameter to another such as from temperature to electricity. The circuit comprises a three winding differential transformer with one winding connected to output terminals and each end of the other windings connected to a sour...	10/23/1990
4855734	Relative position indication system A relative position indication system comprises a cyclical position sensor which includes first and second plates having cyclical windings thereon. The position indication system is operative for determining the relative cycle position between the winding...	08/08/1989
4754220	Digital output rotational position detection device The present device comprises a stator having a plurality of poles on which primary coils and at least one secondary coil is wound, and a rotor opposing the respective poles of the stator with gaps therebetween. A clock pulse generator is provided, and the...	06/28/1988
4700189	Linear resolver A linear synchro/resolver comprised of an opposed pair of stator assemblies, each of which has a plurality of corresponding, opposed, toothed pole piece pairs, a toothed slider movably mounted between the opposed sets of pole piece pairs, and wherein the ...	10/13/1987
4690168	Valve actuator position indicating system A valve actuator for controlling and sensing the rotational position of a valve member includes a positional indicator for sensing the angular position of an actuator shaft, the positional indicator shaft being inductively coupled to a positional indicato...	09/01/1987
4649340	Magnetic differential position sensor To determine the relative position of two objects, for example pistons (16, 22) respectively responsive to the deflection of a brake pedal (10) and actual braking pressure of a wheel of a wheel brake (18) in an automotive power assisted braking system, a ...	03/10/1987
4455555	Control transducer An inductive displacement transducer includes a primary and at least two secondary coils with a movable coupling member for varying the amount of mutual coupling therebetween as a function of the displacement of a movable member. The secondary coils are w...	06/19/1984
4358762	Inductive transducer responsive to displacement along a path The variable inductor and the comparison inductor of a semi-differential variable inductance both have a pair of coils magnetically coupled together. The output current of an amplitude-controlled oscillator flows through the series combination of one coil...	11/09/1982
4322727	Inductive transducer responsive to displacement along a path The variable inductor and the comparison inductor of a semi-differential variable inductance both have a pair of coils magnetically coupled together. The output current of an amplitude-controlled oscillator flows through the series combination of one coil...	03/30/1982
4223300	Electro mechanical position indicator using relatively moveable coils An electromechanical positioner indicator is provided which comprises first and second relatively movable parts, the first part including two oppositely facing surfaces which are everywhere equidistant and the second part including two surfaces which are ...	09/16/1980
4148013	Rotating shaft alignment monitor A system for monitoring misalignment between two in-line rotating shafts and for indicating the direction of shaft misalignment wherein alignment sensors are mounted directly to and rotate with the shafts. The sensors are mounted to detect position or str...	04/03/1979
4132980	High-sensitivity inductive transducer for rectilinear or rotational displacement A core with at least three elongated legs, at least one leg being centrally located among all the elongated legs, is joined at at least one end by a yoke portion connecting all the legs. The central leg or legs is wound with a magnet winding close to the ...	01/02/1979
4112366	Electromagnetic displacement scanner using an E-shaped core oblique to the scan direction An improved electromagnetic scanner has a substantially E-shaped core having an outer surface that is positioned, at a predetermined air-gap spacing, from a regularly grooved ferromagnetic surface of a textile machine. A pair of coils extend around the cr...	09/05/1978
4100480	Position and velocity sensors A sensor of the linear voltage differential transformer (LVDT) type is described, with a moveable core, which has both high permeability and magnetic retentivity, to thereby provide both position and velocity signals. Also described are various embodiment...	07/11/1978
4083237	Differential reluctance motion detector A displacement detector yielding an electrical output signal that is linearly proportional to the extent of input motion. The input motion to be monitored is applied to the shiftable armature of a differential reluctance transducer constituted by a pair o...	04/11/1978
4080592	Transducer for vehicular service compensated for accelerator movements of the vehicle An inductive transducer is provided with a core with legs extending in opposite directions from a yoke on which a coil is wound. On the leg portions extending on one side of the coil a short-circuiting ring displaceable in accordance with the displacement...	03/21/1978
4013911	Displacement - electricity transducer A displacement - electricity transducer contains a movable magnetic core and a fixed magnetic core oppositely arranged so as to have predetermined gaps or clearances in at least two places. Two substantially closed magnetic circuits, each including one of...	03/22/1977
4000448	Control system for sensing the air gap between a cutting tool and a work piece A system for sensing the air gap between a cutting tool and a work piece mounted on a machine for the purpose of controlling the traverse feed rate of the machine as contiguity approaches. A drive coil is mounted on the machine. A search coil surrounds th...	12/28/1976
3961243	Inductive displacement transducer using a bridge circuit having a stable voltage phase in the diagonal of the bridge An inductive displacement transducer comprising a current measuring bridge circuit including a pair of adjustable electrical resistors coupled in series relationship in one half thereof, and a pair of series coupled induction coils and a movable magnetic ...	06/01/1976
3931737	Pulsating liquid flow transmitter A flow transmitter for monitoring pulsating liquid flow rates, such as intermittent or cyclic impulsion produced by reciprocating pumps, employs a short stroke, variable area flowmeter having an armature core mounted in the flowmeter stem. As the stem ris...	01/13/1976

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Class 340/870.35 - Differential type