Abstract: Systems, devices, and methods for determining a torque on a target using an inductive torque sensor are described. The inductive torque sensor may include an excitation coil, two rotors, and two or more receive coils. Each of the receive coils and the rotors may be inductively coupled. The two or more receive coils may be configured to generate a received voltage which can be approximated by a sine waveform function based on the angular changes of the coils on each rotor, the distance of the receive coils from the rotors and the distance between the receive coils. An integrated circuit may be configured to determine the torque generated on the target based on calculated differences between the angular rotation of the first rotor versus the second rotor over a given period.

Abstract: An angular rotation sensor system constituted of: a first target with a member radially extending from, and rotating about a longitudinal axis of the first target; a second target with a member radially extending from, and rotating about a longitudinal axis of the second target; a first receive coil comprising a plurality of loops laid out such that adjacent loops exhibit opposing magnetic polarities responsive to a radio frequency current injected into the transmit coil; a second receive coil comprising a plurality of loops laid out such that adjacent loops exhibit opposing magnetic polarities responsive to a radio frequency current injected into the transmit coil; and an output coupled to each of the first and second receive coils, wherein each of the members is shaped and sized to generally match a shape and size of a pair of loops.

Abstract: The present invention relates to an injection-locked RF receiver having trifilar transformer splitter. The injection-locked RF receiver includes a trifilar transformer splitter, an injection-locked oscillator and a phase detector. The trifilar transformer splitter includes a primary winding, a secondary winding and a tertiary winding. RF input signal is input to the primary winding. The secondary winding outputs a first differential signal to the injection-locked oscillator. The tertiary winding outputs a second differential signal to the phase detector. Using the trifilar transformer splitter of the invention, the frequency-shift keying demodulation with high sensitivity is achieved, and the number of amplifier can be reduced so as to lower the power consumption of the injection-locked RF receiver and reduce the complexity of the involved system.

Abstract: A control device for a travel motor mounted to a vehicle has a resolver which works as a rotation-angle sensor. The control device has a RDC which calculates a rotation-angle output value ? based on rotation detection signals Sa, Sb transferred from the resolver. The control device supplies electric power to the travel motor based on the rotation angle output value ?. The RDC calculates “sin(???)” as an error deviation ? based on the signals Sa and Sb and the rotation-angle output value ?. The RDC calculates an angular acceleration by multiplying the error deviation ? with a gain (=Ka·Kb), and integrates the angular acceleration two times in order to obtain a next rotation-angle output value. A gain control part of the RDC decreases the gain when the judgment means judges that the travel motor rotates at a constant rotation speed.

Abstract: The present invention provides a motor control system and method thereof. The motor control system comprises a motor controller and a compensation device. The motor controller is used for generating a motor control output according to a reference signal and a first signal. The compensation device is used for generating a compensated motor control output according to the motor control output and a second signal. Moreover, the compensation device utilizes the compensated motor control output to reduce the steady-state phase error between the first signal and the reference signal.

Abstract: A control apparatus for a machine that can be operated at high precision in a stable control state is provided by driving a movable body with control parameters suited to the mechanical state. A control parameter calculation circuit is provided to obtain control parameters for a drive apparatus control circuit for driving actuators in accordance with the conditions of actuator rotational velocity, the orientation of the movable body, and the position of the movable body, and a control parameter K for the drive apparatus control circuit is varied.

Abstract: A method and apparatus to process an analog encoder signal. The apparatus includes an analog encoder pattern generating unit, an analog encoder pattern storage unit, a digital/analog converting unit, a comparing unit, a recent state latch unit, a present state determining unit, and a gray code converting unit. The method includes generating an analog encoder pattern by sampling and quantizing a quasi-sinusoidal wave signal output from an analog encoder during initialization; determining a recent state and a present estimated state by comparing the analog encoder pattern with the quasi-sinusoidal wave signal; and generating quadrature signals from the recent state and the present estimated state.

Abstract: A region judging circuit judges an electric angle region of a three-phase brushless DC motor based on an output signal of a resolver. A latch timing output circuit determines an optimum latch timing. A driving direction judging circuit judges a rotational direction of the motor based on a comparison in largeness between a pair of phase currents. A latch circuit latches a judgement result of the driving direction judging circuit at the latch timing designated by the latch timing output circuit and retains the judgement result until the next latch timing comes.

Abstract: Described is an inductive position sensor, in particular for a motor vehicle, which has an oscillator circuit that generates a periodic alternating voltage signal and couples into an exciting coil, several receiving coils each of which forms a periodically repeating lap winding structure and whose overall arrangement forms a receiving geometry, an evaluation circuit for evaluating the signals induced in the receiving coils, and a movable inductive coupling element which influences the strength of the inductive coupling between the excitation coil and the receiving coils. The position sensor exhibits two receiving geometries and two coupling elements, the periodicity of the loop structures of the receiving coils is different in the two receiving coils, and over the total measuring range of the position sensor the numbers of periodic repetitions in the lap winding structures of the receiving coils of the two receiving geometries exhibit a non-integer ratio in relation to one another.

Abstract: A resolver comprises excitation windings for receiving excitation signals and a detection winding for outputting a detection signal. Displacement of a passive member provided with the excitation windings or the detection winding is detected on the basis of the detection signal which varies with the displacement of the passive member. A modulated signal obtained through modulation of a high-frequency signal by an excitation signal is input to each of the excitation windings, and a detection signal is obtained through demodulation of a modulated signal output from the detection winding. Since the modulated signal obtained through modulation (amplitude modulation) of the high-frequency signal by means of the excitation signal is applied to the excitation windings, the number of turns in the excitation and the detection windings can be reduced.

Abstract: A system and method are provided for controlling a stepper motor having a rotor and a multi-phase stator. Sinusoidal command signals define a commanded position of the motor's rotor. An actual position of the rotor is sensed as a function of an electrical angle between the actual position and the commanded position. The actual position is defined by sinusoidal position signals. An adjustment signal is generated using the sinusoidal command signals and sinusoidal position signals. The adjustment signal is defined as a function of the cosine of the electrical angle. The adjustment signal is multiplied by each sinusoidal command signal to generate a corresponding set of excitation signals, each of which is applied to a corresponding phase of the multi-phase stator.

Abstract: A converter circuit for converting an alternating signal representing continuous rotary position into a further signal representing discrete rotary position samples the polarity of an envelope of the alternating signal and develops a state change in the further signal when the envelope changes polarity.

Abstract: A multi-shaft driving apparatus includes a plurality of motors each for rotating one of a plurality of shafts to be synchronously rotated, an encoder, provided for each motor, for detecting a rotational state of the shafts, a pulse generator for generating a pulse signal for rotating the shafts, and a motor control circuit, provided for each motor, for inputting the pulse signal generated by the pulse generator for rotating the shafts and a pulse signal detected by the encoder and used as a feedback signal. The motor control circuit has a PLL control section and a rotational angle phasing section so that a rotational angle phasing control loop is generated to perform a rotational angle phasing operation by the rotational angle phasing section so to as place the shafts in position at a driving start and after performing the rotational angle phasing operation, a rising and steady control loop is generated to perform an operation from a rise state to a steady state by the PLL control section.

Abstract: Where T.sub.1 is a period of a dynamic operation range of a phase comparative waveform of a motor servo apparatus, and a period T.sub.0 of a reference phase signal is measured, the reference phase signal is delayed by T.sub.3 =T.sub.0 -T.sub.1 /2 to obtain a gate signal. The dynamic operation range is started by the gate signal. Thus, the operational center of the phase system is brought in line with the dynamic operation range. The operation is made symmetrical in the dynamic operation range to achieve a rapid servo lock and a stable phase control over the motor servo apparatus, even at the start of the motor or when an external perturbation occurs.

Abstract: An auxiliary resolver position tracking (RPT) system for an industrial robot includes a resolver excitation and monitoring system which is powered by an uninterruptable power supply which includes a battery. The RPT system generates trapezoidal excitation pulses for the resolvers in the robot when no external excitation signal is applied, for example when the robot is shut down. Since there is relatively little motion to be detected in these instances, the RPT system switches between a slow position sampling rate, when no motion is detected, and a fast sampling rate when motion is detected. When operating on battery power, the RPT only switches to the fast sampling rate when motion is detected. To ensure that no motion data is lost when the system switches back to the slow sampling rate, the high sampling rate is maintained for a time sufficient to capture any residual motion of the robot.

Abstract: A resolver system includes a resolver having an annular rotor, and an annular stator arranged around the annular rotor in spaced relationship thereto. The rotor and the stator are arranged such that the reluctance of a space defined between the rotor and the stator varies with a change in the angular position of the rotor in such a fashion that one revolution of the rotor causes one cycle of a fundamental frequency component of variation of the reluctance.The stator has formed thereon a plurality of pole shoes circumferentially arranged at intervals of 120.degree. or 60.degree. to form three of six phases, each of the pole shoes having a single kind of winding wound thereon. A servo driver applies an excitation signal to each of the windings on the pole shoes of the stator to excite same.

Abstract: The invention herein disclosed is a digital circuit which emulates a synchro signal in a synchro-resolver follower system for precise control of shaft position and rotation at very low rotational rates. The subject invention replaces the synchro and drive motor in a synchro-resolver follower system with a digital and analog synchro emulation circuit for generating the resolver control signal. The synchro emulation circuit includes amplitude modulation means to provide relatively high frequency resolver excitation signals for accurate resolver response even with very low shaft rotation rates.

Abstract: An improved heliostat device for an electrooptical system in which a mirror is gimbaled in two axes for line-of-sight direction and stabilization. A half angle drive system is connected to the mirror for controlling azimuth rotation of the mirror relative to the stable body from which the mirror is mounted. The half angle drive system comprises a N-2N-speed synchro transmitter-receiver pair, with the N-speed synchro control transmitter mounted on the stable body axis, and the 2N-speed control receiver mounted on the mirror axis. This synchro transmitter-receiver pair is operable with a null error signal controlling mirror drive such that the angular rotation of the mirror is one-half that of the angular rotation of the stable body.

Abstract: A DC to DC sine/cosine positioning servo system has an electro-mechanical DC to AC converter. The latter includes a DC torquer, having a rotor with respective windings for receiving two DC input signals proportional to the error signals detected. Mechanial movement of the rotor is proportional to the relative values of the two input signals. The rotor of a synchro control transmitter is mechanically coupled to the rotor of the DC torquer. A reference oscillator is provided which produces an AC output voltage at a predetermined frequency. The oscillator output is connected to the rotor of the control transmitter. The stator windings of the control transmitter are connected to the stator windings of a control transformer. The rotor of the control transformer produces an output voltage directly proportional to the relative angle between the rotor of the control transformer and the stator windings.

Abstract: Angular position and rotation rate of a function generator having stator windings and rotor windings are determined by first amplitude modulating a carrier oscillation to form a sine signal and a cosine signal and then feeding the sine signal and cosine signals to opposite stator windings and thereby inducing in the rotor winding an analog function-generator signal. In turn this analog function-generator signal is converted into a digital function-generator signal from which is derived by means of an algorithm a digital rotation-rate signal which is numerically integrated to obtain an angular-position signal. This angular-position signal is itself used to modulate the carrier oscillation.

Abstract: A multiple rotational position sensor includes a stator winding provided to a stator mounted to a casing and a rotor having a rotor winding provided to a rotor shaft mounted for rotation to the casing, in which the rotational position is sensed by the relative rotation between the rotor and the stator. According to the present invention, the sensor also includes a speed reducing unit for coupling the rotor shaft and the casing together and outer bearings for rotatably carrying the casing, which is revolved by rotation of the rotor shaft by an angle less than the angle of rotation of the rotor shaft.

Abstract: A linear, analog, synchro control differential transmitter for implementing he common synchro CDX function whereby a scaled linear analog voltage is used as input instead of a mechanical shaft angular displacement. Alternate synchro functions of CT and CX that the invention implements are also disclosed.

Abstract: A system for producing a digital representation of the value of an angle .theta., typically a phase angle, from two analog input quantities representative of A sin .theta. and A cos .theta., where A is an amplitude factor, comprises logarithmic amplifiers (IC1-IC4) which produce analog representations of a plurality of quantities (sin .theta., cos .theta., sin (.theta.+3.pi./4), cos (.theta.+3.pi./4)) derived from the two input quantities and which are arranged to add or subtract their outputs to produce quantities (V.sub.1 -V.sub.4) which are independent of A and the value of each of which lies within a predetermined range (-C to +C) in at least one respective portion (2.pi./n) of an angular range for .theta. of 2.pi. radians. The digital representation of .theta. is the concatenation of digital representations of the angular portion (2.pi./n) in which .theta. lies and of the value of .theta. within the portion that is derived from the selected appropriate one of the quantities V.sub.1 -V.sub.

Abstract: An improved drive control circuit is disclosed for enabling the multiplexed drive of synchro receivers. A zero crossing detector is coupled to sense the zero crossings of a signal driving the excitation winding of a synchro receiver. A counter coupled to the output of the zero crossing detector responds to one of every n counts to provide a count signal for operating a synchro driver associated with each one of multiple synchro receivers. The count signal causes the synchro driver to provide a signal output to the respective synchro receiver during a period defined by the count signal to reduce average power dissipation and provide effective damping without sacrificing peak current capability.

Abstract: A control device suitable for synchros comprising three stator windings. The device comprises four circuit branches with the inputs of the first and the second branches interconnected to receive a first voltage from the ends of the stator windings of the synchro transmitter and with the inputs of the third and the fourth branches interconnected to receive a second voltage from the ends of the stator windings of the synchro transmitter. Two adder elements supply control voltages to the stator windings of the synchro receiver. Two inputs of the first adder are connected to the outputs of the first and the third branches, respectively and the two inputs of the secnd adder are connected to the outputs of the second and the fourth branches. These branches have transfer functions in the form sin (.alpha.+.phi.1), sin (.alpha.+.phi.2), sin (.alpha.+.phi.3), sin (.alpha.+.phi.4), respectively, wherein .alpha. represents the information supplied by a digital element and .phi.1, .phi.2, .phi.3, .phi.

Abstract: A control system for synchronizing a combination press line comprised of a transfer press and a double-action press.The transfer press is set as a master press and the double-action press as a slave press following the transfer press in operation.The transfer and double-action press each has a synchro coupled to respective drive shafts for detecting an angular position of each press. A comparator is provided for comparing signals from both synchros and generating a signal corresponding to a difference between signals from both synchros. The output signal from the comparator is fed only to a motor for the double-action press for controlling the speed of the motor, thus enabling the double-action press to follow the transfer press in operation.

Abstract: The disclosure describes a device for continuous analog position control of multiple torque receivers by a single low power synchro signal source. The device provides continuous control of the magnitude and direction of current flow between the stators of the controlled torque receiver(s). The current flow produces torque which moves the rotor(s) to the desired position.

Abstract: A step data to synchro converter for coupling one of a plurality of different step data transmitters to one of a plurality of different synchro receivers. The output of the step data transmitter is applied to an interface circuit and processed into a three bit binary code suitable for actuating a plurality of switching means. The switching means selectively apply an in-phase and an out-of-phase output of a transformer, which is responsive to the synchro receiver's reference voltage and frequency source, to a plurality of transformers associated with the input stator windings of the synchro receiver. The output of the plurality of transformers is a drive signal which satisfactorily approximates synchro data.

Abstract: This system accepts compass outputs from a wide variety of compass output devices such as stepper and synchro devices having different coupling ratios, supply voltages and carrier frequencies. The system then, as part of a PPI radar system, electronically converts these compass outputs without the usual intermediary electromechanical devices into real-time analog reference signals properly phased with respect to the radar timing to provide an electronically stabilized PPI. This is achieved by comparing the points of equal amplitude of any two phases of gyro compass synchro output signals and using these major transition points to provide a digital code indicating the angular position of the gyro output shaft; a microprocessor then transforms the code, by comparison with a previously stored position code into coded position change signals which are then used to change a stored angular value, representing the course of the ship.

Abstract: In a speed detector having a fixed frequency oscillator for producing two-phase sine waves to excite two-phase exciting windings of a resolver, first and second multipliers for multiplying the output of the detecting winding of the resolver by the two-phase sine waves respectively, and a position conversion circuit and speed conversion circuit, the speed conversion circuit comprises: a third multiplier for multiplying a signal of the first multiplier by a signal of a VFO; and a fourth multiplier for multiplying a signal of the second multiplier by a signal of the VFO, the outputs of the third and fourth multipliers being applied through a comparator to a proportional integration amplifier, the output of which is used as the rotation speed signal and applied to the VFO, thereby to eliminate the necessity for provision of a countermeasure against harmonics and harmonic noise involved in the use of an integration circuit required when a resolver is used as a detector.

Abstract: To generate a signal having at all times an amplitude directly proportional to the velocity of relatively moving members, a plurality of phase displaced position indicative signals are first generated. A pair of the position signals that are phase displaced by 90.degree. are then differentiated to provide velocity signals. Each velocity signal is applied in both its regular form and its inverted form to an analog multiplexer which receives the other position signals as control signals. The composite output of the multiplexer, after filtering to remove high frequency glitches due to sampling, is a signal having an amplitude at all times directly proportional to velocity.

Abstract: An automatic motion or position control DC servomotor system in which a load-driving axis driven by a DC motor to be controlled in one rotary mechanism is rotated synchronously with, or following the rotation of, a reference axis manually operated or driven by another DC motor. The system comprises a position signal generator producing first sine- and cosine-wave signals corresponding to an angle of rotation of the controlled load-driving axis; a command signal generator producing second sine- and cosine-wave signals corresponding to an angle of rotation of the reference axis; an arithmetic unit processing the first and second sine- and cosine-wave signals and providing a sine-wave feedback voltage output signal; and a driver circuit amplifying the feedback voltage signal and providing a thus amplified signal to the DC motor driving the load-driving axis. When the reference axis is driven by another DC motor, the command signal generator may be a second position signal generator.

Abstract: A circuit for overcoming variations in the output signals from a synchro device resulting from a.c. supply voltage variations includes means to provide a pulse train in which the pulse widths are modulated in accordance with supply voltage variations. A signal derived from a pair of synchro output terminals is applied to a rectifier/filter which is intermittently actuated by the pulse width modulated signal. The resultant d.c. signal is effectively divided by a factor proportional to the supply voltage so as to be independent of variations in that voltage.

Abstract: The outputs of a three-wire synchro are applied to a multiplexer which provides the multiplexed synchro outputs to an amplifier and demodulator. The demodulated synchro outputs are applied to a demultiplexer whose outputs are filtered to provide demodulated d.c. voltages corresponding to the synchro output signals. The demodulated d.c. voltages are applied to a conversion circuit for providing the sine and cosine of the angular position of the three-wire synchro device. The multiplexer, demultiplexer and demodulator are synchronized by the synchro a.c. reference signal.

Abstract: A control for a profiling machining tool, and a method for controlling such a tool. The machine tool includes a sensing head which moves along a template or pattern to produce a signal that causes motors relatively to shift a cutting tool and a workpiece so as to duplicate in the workpiece the profile of the template or pattern. Two sinusoidal signals are generated as a consequence of stylus deflection along orthogonal axes. They are combined to form a single sinusoidal signal which is then variously processed to produce an error signal which causes the motors to operate in directions which tend to reduce the error signal, and to cause the stylus automatically to move along the profile while doing so.

Abstract: A detector responsive to an angular offset between a gyrosphere of a gyrocompass and a tilt ring, forming part of a gimbal mounting therefor, controls a follower motor coupled through a reduction gearing with a suspension shaft for that mounting, the shaft being further coupled with a first synchro transmitter. A second synchro transmitter, electrically connected to several synchro receivers forming part of respective repeaters, is driven by a servomotor through a reduction gearing of step-down ratio 1:3 and is mechanically linked with a third synchro transmitter through a reduction gearing of step-down ratio 1:360, the third synchro transmitter being electrically connected to the first synchro transmitter for producing an error signal delivered through a feedback loop to the servomotor for keeping same slaved to the suspension shaft.

Abstract: In order to provide high accuracy shaft angle to linear DC voltage conversion using low accuracy devices, a linear synchro is excited by a 2.5 KHZ square wave which is power buffered, the square wave also used to synchronously demodulate the output of the wound component by sampling and a demodulated voltage then filtered and scaled to the required levels using commonly available operational amplifiers.

Abstract: The control system uses shaft angle controlled synchro resolver devices for producing reversible polarity signals related to the variable shaft angle position and independent of variations in the amplitude of the electrical carrier excitation of the synchro resolver and of spurious phase shifts seated therein.

Abstract: The indications of attitude indicators at two different indicating locations that are indicating the same parameter but actuated from different sources, are monitored for the same indication by electrically interconnecting two transolvers that are mechanically coupled to the respective attitude indicator at each location. A monitor, at one indicating location, furnishes the excitation for the transolver at the other location and by the magnitudes of the sine and cosine outputs of the local transolver furnishes flag indication of any system defects of either indicator at each location.

Abstract: An arrangement for controlling a plurality of synchro receivers from a single command position. The system requires very little power relative to the torque produced in the controlled synchros. The desired synchro movement is achieved by selective interconnection of the stator terminals at appropriate times to effect desired rotation of the rotor.

Abstract: A roll and pitch servomechanism for use in an attitude indicator is shown having an expanded scale in which a nonlinear electrical circuit is combined with a nonlinear mechanical indicator to produce an accurate indication of pitch attitude over an expanded range. The circuit includes an operational amplifier circuit connected in one leg of a balancing circuit which is connected in a delta configuration across the windings of a control transformer whose windings are connected in a Y-configuration.

Abstract: A device employing the inherent self-torquing properties of a torque repeater to position its rotor. In the present invention, the torque repeater or synchro may have three stator windings and an output rotor. It is contemplated that the electrical input to the device will be digital signals. However, the invention will perform equally well with time varying or analogue input signals. A plurality of electronic switching means are connected to the stator terminals of the synchro converter and they operate under the control of a programmable switch control to short-circuit predetermined stator windings to provide the desired positional output signals. A sectant detector connected to the stator windings detects signals on the stator windings and determines the present position of the rotor. From this information, the desired positioning of the rotor is attained from the signals from the sectant detector.

Abstract: This invention relates to an electronic apparatus for automatic positioning and distance measurement of mobile members. The apparatus according to the invention comprises a rotary electromagnetic transducer with two pairs of windings, in which the primary circuits receive electrical voltages representative of the controlled angular distance values and the secondary circuits deliver accordingly an electrical response voltage, whose shape and amplitude depend on the difference between said controlled distance and the mechanical angle between rotar and stator portions containing said secondary and, respectively, primary circuits. The electrical voltages representative of the controlled angular distance values are generated by electronic circuits comprising a first binary counter which translates the controlled distance into binary code, a second binary counter which generates a binary ramp, two adders, a combining network, four sequential networks and two analogue amplification and sign circuits.

Abstract: The linear signal output range of a rotary transformer type device, such as a sine/cosine synchro, is considerably extended beyond its normal 45.degree. linear range by electronic circuit means. Specifically, the electronic circuit means utilizes the sine signal, which is generally linear from 0.degree. to 45.degree., as a portion of the output signal and utilizes a resultant signal computed from the cosine signal, which is linear from 45.degree. to approximately 135.degree. for the remaining portion of the output signal.

Abstract: The instant invention relates to a repeater for processing signals from a three wire synchro to control carrier phasing and frequency, while retaining identity of the angular information. The solid state repeater consists of an arrangement in which the synchro signals bearing the angular information are first demodulated. The demodulated signals are thereafter remodulated in a closed loop modulating network.The phase and frequency of the carrier which is modulated in the closed loop modulating network may be controlled as desired. The modulated carrier is impressed on a negative feedback path in which the signal is demodulated utilizing the selected carrier to produce a variable DC signal which is fed back to the input of the modulating loop so that at null balance the output signal from the modulating path duplicates the angular information from the three wire synchro except that the carrier phase and frequency is controlled as desired.

Abstract: A radar system having an adaptive compass drive capable of operation over a wide variety of compass outputs and supply voltages and frequencies. For compass outputs in the form of multi-phased analog signals, a digital phase detector converts the signals to a series of digital pulses which are used to operate a three-phase to UP-DOWN pulse converter. If the gyro compass output signals are in the form of overlapping digital signals, the converter changes the signals directly to a sequence of UP or DOWN pulses. The UP-DOWN pulses are used to operate a binary counter which operates the phases of a multi-phased stepper motor which is coupled to the true bearing scale of the radar system the output of which may also be used to operate a north stabilization synchro converter for the radar display.

Abstract: The circuit derives a rate signal from an a.c. signal proportional to attitude displacement provided, for example, from the synchro pickoff of a vertical gyroscope or an inertial navigation system, the pickoff receiving power from the aircraft a.c. power supply. The a.c. attitude signal is passed through a first bandpass filter tuned to the frequency of the power supply. The a.c. power supply signal is passed through a second bandpass filter identical to the first whose output is used as the reference signal for first and second identical demodulation circuits which include first and second matched low pass filters respectively. The filtered a.c. attitude signal is applied to the first demodulator circuit and the filtered power supply signal is applied to the second. The output of the first demodulator circuit is applied to a line voltage compensator and the output from the second demodulator circuit is applied to a d.c.

Abstract: The instant invention relates to turn-rate signal generating circuitry for interrupting slaving of the directional gyro and roll erection of the vertical gyro in a heading, attitude and reference system whenever the turn-rate of the vehicle on which the system is mounted exceeds a predetermined rate. Cutoff of slaving and roll erection eliminates acceleration induced dynamic errors produced by excessive turn rates and is effectuated in response to a turn-rate signal (i.e., an angular rate signal) generated indirectly from angular position (i.e., shaft position) information. The angular position information is in the form of carrier signals amplitude modulated as a function of the sine and cosine of the angle .theta.. These signals are converted to modify the carrier phases so that they are respectively sinusoidal and cosinusoidal functions of the carrier frequency.

Abstract: A maneuvering control system particularly for use in controlling a vehicle such as a submarine or surface craft, which utilizes both manual and automatic control. Electrical signals in accordance with the manipulation of a manual control device are generated by means of a synchro transmitter and fed to a synchro differential transmitter. Automatic control signals generated in an automatic control signal generator are converted to a mechanical form by a synchro follower which provides a mechanical input to the differential transmitter. Adjustable limit stops are provided for the synchro follower output shaft to limit the automatic signal input to the differential transmitter, thereby preventing an "out-of-control" condition in the event of a malfunction in the automatic control signal generator. The output of the differential transmitter which represents the algebraic sum of the manual and automatic inputs is used to drive a synchro control transformer, which in turn drives a servo amplifier.

Abstract: A transducer coupled to a motor shaft provides both position and velocity information for use in a closed loop control system. The transducer includes a disk with deposited metallic parallel conductors each conductor carrying current in a direction opposite to the adjacent conductor. Relative movement of one disk with respect to another produces a position signal in a manner well known in the art. However, multiple windings are used to provide multiple position signals displaced in space phase which are then processed by differentiation and commutation to provide a velocity signal used as a control voltage in the control loop. A reference signal is also derived by commutation from the position signal.