Abstract: The compact digital resolver/encoder assembly comprises a resolver and a flexible printed circuit board having a number of electronic components for decoding the resolver mounted on the flexible printed circuit board. A generally cylindrical container is provided having a cylindrical wall, a closed end and an open end. The circuit board is folded into a generally cylindrical shape and received in the container separate from the resolver. The circuit board is insulated from the container by an electrical insulating potting compound situated in the container and surrounding the circuit board. The resolver is received in the container and is spaced a predetermined distance from the encapsulated circuit board. Preferably a voltage regulator is mounted to an inside wall of the container and electrically coupled to the circuit board. Also, preferably, wire conductors between the resolver and the circuit board are longer than necessary to allow the resolver to be positioned outside the container when the potting compound is inserted in the container.

Abstract: A magnetic structure including a stator including sensor windings and a field exciter, and a movable armature having a variety of applications, including a synchro resolver and a tachometer. The stator comprises a plurality of planes of oppositely polarized parallel magnetic pole pieces contained in an annular or toroidal structure of rectangular cross-section to circumferentially surround the movable rotor or armature. The parallel pole pieces of opposite polarity form a segment extending radially inward, and are surrounded by a plurality of sense windings, wherein the rotor selectively provides a relatively low reluctance path to one or more of the pole pieces, causing a change in flux and corresponding voltage to be produced in the sense windings. In one embodiment, the pole pieces are energized by a permanent magnet located in the stator to produce a tachometer output voltage upon the sense windings. In that configuration the sense winding signals vary in amplitude according to velocity and position. Alternately, the pole pieces are energized by an electromagnet at an excitation frequency, producing corresponding sense winding signals at the excitation frequency. In this case, the sense winding signals vary in amplitude and phase according to the rotor position relative to the stator. The sense winding signals for the tachometer or synchro resolver are connected to appropriate commutation and signal detection circuits to provide the desired tachometer or synchronous resolver output signals.

Abstract: A speed control apparatus for a synchronous motor is provided with a resolver fixedly connected to a rotor of the motor, which produces a phase modulated signal corresponding to an angular position of revolving magnetic field in the motor, a circuit for converting the phase modulated signal into a rotational speed signal of the motor, a phase compensation circuit for advancing in phase a reference signal in accordance with the rotational speed signal, a multiplier for multiplying the phase modulated signal and a rotational speed instruction signal, a synchronous rectifier for synchronously rectifying the output of the multiplier by an output of the phase compensation circuit, and a current control loop circuit for receiving an output of the synchronous rectifier and for producing a signal having a phase angle delayed as much as the phase angle is advanced in the phase compensation circuit.

Abstract: ABSTRACr The design and analysis of a distributed multiple-response resolver for value-ordered retrieval is presented. It is similar to the design proposed by Ramamoorthy et. at., the fastest scheme to date in its class, but has a number of improvements over it. We present the detailed algorithm and the logic design of our scheme. Its performance is evaluated by simulation. Approximate analytical results are given as well. We also compare our design with previous designs to illustrate its superiority. The most important feature of our design is to terminate the selection process as soon as the responder set contains only one responder or the largest responder includes all the other responders in the active responder set, and to retain the history of the selection process so that succeeding retrievals do not have to start from the first bit slice.

Abstract: Multiple-phase two-pole inductive sensor, with non-wound rotor recessed over a half-circumference. The stator 11 includes a primary 5 wound in four poles and a series of secondaries 4, 6, 7. The voltages of the secondaries are combined in order to ensure operation of the sensor as a resolver, as a linear inductive sensor, and as an absolute angular position sensor.

Abstract: A system and method for continuous tuning of a YIG oscillator over its entire operating range by control of a resolver in a feedback loop around the oscillator. The resolver and a delay line form a phase shift network the output of which is compared in phase with the output of the oscillator, which is also coupled to the input of the resolver, and the phase-difference signal resulting from the phase comparison is coupled to an integrator connected in turn to the tuning signal input of the oscillator. Repetitive operation of the resolver over its operating range enables continuous tuning of the oscillator over its entire operating range.

Abstract: A resolver is mounted on the rotating shaft of a motor under control. Two carriers having a 90 degree phase difference are supplied to the resolver causing the resolver to produce a phase signal having a phase proportional to the angle of rotation of the controlled motor. At a phase detector, the two-phase carriers are subjected to detection by the above stated phase signals to form phase detection signals and wave-form converters continuously convert these phase detection signals into voltage signals. At the same time, a deviation signal generating part, forms a deviation signal representative of a difference between the phase signal of the resolver and a control command phase signal. Multipliers multiply the two-phase continuous voltage signals by the deviation signal and produce multiplication signals. The multiplication signals are applied via a two-phase to three-phase converting circuit to a motor driving circuit thereby controlling the speed and position of the motor.

Abstract: The invention relates to a remotely-operable remote handling arrangement use in radioactively loaded large-area cells of facilities containing process equipment for reprocessing irradiated nuclear fuels. The remote handling apparatus has an industrial robot which is controlled by a process computer and which, for the purpose of detecting the position of an arm of an articulated joint of the robot, is provided with a rotary sensor for determining the angular position of the arm. The rotary sensor is configured as a resolver and is configured pursuant to the induction principle. A second resolver is arranged coaxially with respect to the first resolver in order to be able to check the true position of the arm of the joint. On its shaft, the second resolver has a suitable indicator which is rotatable with the shaft relative to a zero mark. The true position of the shaft of the first resolver and thus the true position of the monitored arm is detected by a scan from the zero mark to an indicator on the shaft of the first-mentioned resolver.

Abstract: A resolver which in a preferred embodiment utilizes a stator member, preferably made of a single piece of ferrite material, which has active stator sine poles and active stator cosine poles and a rotor member which has passive rotor poles. The active stator poles have excitation voltage inputs supplied thereto and, as the rotor poles rotate relative thereto, the sine and cosine stator poles supply voltage outputs which vary sinusoidally and co-sinusoidally, respectively, as a function of the angular position of the rotor member relative to the stator member. Multiple stator and rotor pole combinations can be used to provide resolver operation at different speeds.

Abstract: A semiconductor wafer 19 is secured by vacuum to the top of a shaft 13 and has the shadow of its edge resulting from illumination by a source 24 projected on a light sensor 25 which provides an analogue signal to a processing circuit 26. This supplies digitised information to a computer 27 which also receives information from a resolver 22 which provides a signal representative of the angular orientation of the shaft 13 in successive angular positions, thus enabling the computer 27 to calculate the angular orientation of the wafer. The desired orientation is stored in the computer which energises a motor drive unit to cause a servomotor 20 to turn the shaft 13 to the desired orientation.

Abstract: PURPOSE:To drive a resolver device efficiently with a little electric power by providing a magnet rotor, two magnetism sensing elements, and a function generator which sends out a sin and a cos signal, and processing respective output signals by a multiplier and an adder. CONSTITUTION:Two magnetism sensing elements 21 and 22 are arranged at an interval of an electric angle pi/2 or its odd multiple in a magnetic field established by the magnet roller 23 magnetized to 2n (n; integer more than 1) in the circumferential direction of rotation, and they are driven by the common DC power source 24. The function generator 28, on the other hand, generates the sin signal and cos signal which have a phase difference of the electric angle pi/2, those output signals and output signals of the magnetism sensing elements 21 and 22 are multiplied by two sets of multipliers 25 and 26 respectively, and their outputs are added together by an operational amplifier 27 which constitutes an adding circuit. Thus, precise detection is attained.

Abstract: PURPOSE:To enable high-precision detection, by installing a plurality of detectors generating an electric signal of period corresponding to each different specified mechanical variables. CONSTITUTION:A feed screw 71 for a certain X-axis of, for example, a machine tool is mounted on an output shaft 72 of a motor 50. The secondary outputs PV, PU, PT, PS of each resolver 56, 53, 54, 55 are transmitted to an analog-switch 63 through wires 62, 59, 60, 61 and after selection of some one of them, it is transmitted to an isolator 64 through a wire 82. An output signal subjected to ground- separation by the isolator 64 is transformed into a rectangular wave by a comparator section 65 and then it is delivered to a resistor 58 as an enable signal EN by FF66 and a NAND gate. Then a value of a 2,000-mal counter 57 is, in synchronization with a clock CK immediately after input of its signal EN, set in the resistor 58 through the line 80 and the value is taken into the CPU68 for processing and stored in a memory 69.

Abstract: PURPOSE: To obtain a highly accurate electromotor control system by reducing position and speed ripples, by modulating a comparing level by angle of rotation at the time of the shaping of a resolver detection signal. CONSTITUTION: Signals Vα, Vβ having 90° phase difference are supplied to a resolver 2 and a compensation circuit 5 from an exciting circuit 1 and the signal Vα is further sent to a wave from shaping circuit 4. The angle-of-rotation signal detected by the resolver 2 is sent to a wave form shaping circuit 3 and the compensation circuit 5. In the circuit 5, each exciting signal is introduced into a phase shift adjusting part 8 to form predetermined voltage with respect to amplitude, frequency and a phase and said voltage is multiplied by the angle- of-rotation signal in an analogue multiplier 9 and voltage of a predetermined phase is obtained through LPF (filter) 10, a gain adjusting part 11 and an offset adjusting part 12 to be supplied to the comparator of the shaping circuit 3. A comparing level is modulated by the angle-of-rotation signal in the circuit 3 to perform the shaping of a wave form and an output signal Pθ is converted to a speed signal through a F/V converter circuit 6 and sent to a position operation part 7. Then, by counting from the rising of the output signal of circuit 4 to the rising of the signal Pθ, a position signal is obtained. COPYRIGHT: (C)1987,JPO&Japio

Abstract: PURPOSE:To shorten the axial length of a motor and to enhance the assembling accuracy by extending the end of a stator coil of the side mounted with a resolver toward an outward direction, and containing a rotor bearing inside the extended portion. CONSTITUTION:In a motor with a resolver in which the resolver 5 is secured to the end of a motor housing 21, and a rotational shaft 31 of the resolver is coupled with one end of a rotor rotational shaft 27, the end of a stator coil 22 is extended toward the outward direction, and a bearing 29 of a rotor is contained in the space inside the extended portion. The end of the coil 22 may be extended only at the side mounted with the resolver 5, but the end of the stator coil at the opposite side to the resolver 5 be may extended to contain the bearing 28 inside.

Abstract: A device for detecting absolute position employs a resolver (106) as position detector means. An interpolated error corresponding to the rotational angle of the rotary shaft of the resolver (106) is stored in advance in a data memory which consists of a bubble memory (102h) in a numerically controlled apparatus (102). When an absolute position is to be detected, the interpolated error of the resolver (106) is read out from the memory, and an absolute position signal detected by the resolver (106) is corrected by the interpolated error thereby to detect a correct absolute position.

Abstract: A resolver digital converter circuit contains memories in which the digitised representations of wave forms generated by a resolver are stored. Because of this adaptation of the stored digitised wave forms to the resolver used in connection with the digital converter circuit, errors generated by the resolver are compensated. A procedure for obtaining the adapted digitised wave forms, and entering them in the memories, is also given.

Abstract: The technique compensates the resolver's output digitally by means of a dtal processor and a predetermined resolver error characteristic. The technique uses a digitally compensated resolver which compensates by the use of a truncated Fourier series.

Abstract: PURPOSE:To resist temperature change strongly and to make handling simple, by arranging two resolvers, in which two or more double shaft angles are continued, on a rotary shaft body, and connecting a computer, which computes the corresponding value of a rotary angle, a period judging device and a rotary-angle operator in a specified manner CONSTITUTION:First and second resolvers 16 and 18 are supported on a rotary shaft 10 The double shaft angle of the resolver 16 is made to be an integer of 2 or more The double shaft angle of the resolver 18 is made to be an integer of N+1 The output in each rotary angle area is increased monotonously from the respective initial value A period judging device 22 is connected to the output side of a computer 20, which is connected to the output sides of the resolvers 16 and 18 A rotary angle operator 24 is connected to the output sides of the judging device 22 and the resolver 18 Thus, the mechanical changes in the resolvers 16 and 18 accompanied by the change in temperature, which is inversely proportional to the double shaft angle, can be made small

Abstract: PURPOSE:To easily enable an existing device to improve its performance, by automatically correcting the thermal displacement of a tool by an excitation signal generating means provided separately from the numerical control device. CONSTITUTION:An excitation signal generating means generates signals, that is, sin(wt+thetas) and cos(wt+thetas) in which a signal from a step motor and a differential resolver coupled to a microcomputer unit 88 is phase-modulated on the basis of a signal from a temperature sensor. A resolver 62, utilizing in its primary side these signals as an excitation signal, easily enables a device to perform desired correction by providing the excitation signal generating means optionally in the existing numerical control device even when it is not provided with a correcting function of the thermal displacement of a tool.

Abstract: PURPOSE:To accurately calculate the optimum value of the time constant of a speed control system by sampling the output of a period measuring circuit after the lapse of time of 1/4 of the set value from when the output of the measuring circuit becomes equal to the set value. CONSTITUTION:When a sinusoidal speed command Nref is outputted, a motor 13 rotates at a speed Nref. At this time, the period tau of the output of a resolver 14 excited by a frequency f0 is obtained by a zero cross interval counter 16. A microcomputer 11' calculates the speed N of the motor 13 from the period tau. A comparator 17 outputs a drive signal when the period tau becomes equal to the period tau0 corresponding to the speed 0 of the motor 13. A timer 18 outputs an interrupt signal when 1/4 of period is elapsed from the variation in the speed from when a drive signal is applied. A microcomputer 11' calculates the speed N of the motor 13 by an interrupt signal, and the time constant of the speed control system is calculated by the value being obtained.

Abstract: PURPOSE:To control smoothly the speed of an object to avoid an evil effect to a machine mechanism by controlling the gain of a position control loop so that the speed changing factor is reduced when the object passes through points between two specific points. CONSTITUTION:The signal of a resolver 2 synchronizing with a motor 1 is converted into a pulse by a converter 3. These pulses are counted by a counter 4. A shift amount is delivered from a position command output part 5, and the difference between this shift amount and the output of the counter 4 is delivered by an integration counter 6. This difference is supplied to a speed control part 9 through an amplifier 7 and an A/D converter 8, and the value of the counter 6 is controlled to zero. The position command values V2 and V1 are extracted from the part 5 by a position command part 10. Then V2/V1 is calculated by an arithmetic unit 11, and the gain of the amplifier 7 is switched at the place near a passing point. The gain of the amplifier 7 is reset to the original amplification factor after passing the point. Thus it is possible to perform smooth control of speed when an object passes through points between two specific points and to avoid an evil effect to a machine system.

Abstract: PURPOSE:To improve the detecting accuracy by respectively connecting correcting windings to exciting and detecting windings, and magnetically coupling them. CONSTITUTION:When the exciting winding of a resolver 6 receives a current from an exciting power source 8, a phase signal detected through a remaining voltage canceller 7, on which windings Calpha, Cbeta are wound, or from the resolver 6 is produced from a detecting winding 5, and fed through a winding Ctheta wound on the canceller 7 to a detector 9. The windings Calpha, Cbeta, Ctheta are for correcting, and magnetically coupled to each other. Auxiliary legs (magnetic material) 11, 12 are provided to equalize the amplitude and phase of the voltage VthetaC generating from the winding Ctheta and the remaining voltage VthetaR, holes 13-16 are opened at the legs 11, 12 and a magnetic unit 10, bolts 17, 18 are inserted and twisted, and crossing magnetic flux amount is adjusted by altering the magnetic resistance.

Abstract: PURPOSE:To detect the absolute extent of rotation of a rotating body at low cost by providing the 1st rotation detector, a speed reduction gear which is connected thereto and has a constant ratio, and the 2nd rotation detector, and performing processing by a processor on the basis of their output signals and the speed reduction ratio. CONSTITUTION:A resolver 14 as the 1st rotation detector is coupled directly with the left end of a ball screw 10, a rotor coil is installed in a stator to generate a resolver signal, and the 2nd resolver 22 of the same structure is connected through the speed reduction gear 20. Both resolvers 14 and 22 are connected to a resolver signal digital converter 18 through a resolver signal switch 16 to send their output signals to a microcomputer 24. Then, the converter 18 connects with a carry-borrow detector 28 having an up/down counter 30 and necessary contents are read in the microcomputer 24. Consequently, the absolute extent of rotation of the 1st rotation detector is obtained by the inexpensive detectors.

Abstract: PURPOSE:To eliminate the need for the processing time of a computer by feeding the deviation between a resolver detection frequency and a resolver excitation frequency back, and computing a resolver rotation frequency through hardware configuration. CONSTITUTION:A resolver 1 has exciting windings 1a and 1b and a detection winding 1c. The exciting windings 1a and 1b are supplied with an exciting current from a resolver exciting circuit 2. The output of the exciting circuit 2 and the output of the detection winding 1c are inputted to an up/down counter 5 through waveform shaping circuits 4 and 3. A binary digital number D proportional to the difference between the resolver excitation frequency and resolver detection frequency is supplied to an absolute value circuit 6. A frequency proportional to the digital number D is fed back to the input terminal of the up/ down counter 5 to detect the rotating speed of the resolver 1 as the counted value of the up/down counter 5.

Abstract: The invention relates to a numerically controlled turret punch press which, according to the invention, has a reduced number of dogs on the crankshaft (5), a simpler and cheaper design thereby being obtained. A rotation-detecting device (31) is mounted on the crankshaft of the turret punch press. The rotation-detecting device can be a shaft encoder or a resolver. The output of this device is used to establish the angle of rotation of the crankshaft and the vertical positioning of a selected metal die and/or of a selected punch is carried out in response to this.

Abstract: PURPOSE:To enable high-precision detection, by installing the second detector available for detection of an absolute value corresponding to the first detector generating to a member to be measured an electric signal of period or amplitude corresponding to a travelling distance and to the travelling distance CONSTITUTION:A table 31 is screwed on one side of an output shaft 41 of a synchronous motor 30 through a ball screw, the table 31 being free to move back and forth along the X-axis A resolver 33 and the secondary output signals P1, P10, PA from an absolute position detector 34 are fed back to a driver/convertor circuit 32 through wires 36, 37, 38 The signals P1, P10, PA fed back to the circuit 32 are converted to position data there and transmitted to CPU40 through a line 39 An absolute angle value of a resolver 33 (motor 30) is calculated basing on the position data given from the circuit 32 at the CPU40 and by combined use of these data and the absolute position, the position at that moment of the table 31 can be detected