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| Number | Title | Issue Date |
| 7973503 | Motor system employing analog encoded hall effect sensor position information for reduced wiring A system has a sensor assembly mounted adjacent to a moving magnetic member such as a motor rotor to sense its position. The sensor assembly includes Hall-effect sensors each having a binary output, configured such that distinct positions of the moving magnetic memb... | 07/05/2011 |
| 7365452 | Sensor device and output characteristic switching method of sensor device A pressure sensor device (1) includes a sensing element (2) for sending an analog signal according to pressure. The pressure sensor device (1) outputs the analog voltage to a microcomputer (20) through an input-output terminal (8).... | 04/29/2008 |
| 7148647 | Numerical control device An analog amplifier performs control of a motor at the speed in proportion to a speed instruction (analog voltage) outputted from a numerical control device. The speed instruction (analog value) is converted into a digital value by an A/D converter and is then sent ... | 12/12/2006 |
| 7069613 | Method and apparatus for aligning an aircraft with a passenger loading bridge Disclosed is a method and system for aligning a door of an aircraft to a passenger loading bridge. A final parking position of the aircraft is defined as being immediately adjacent to a position of the passenger loading bridge, such that when the aircraft is stopped... | 07/04/2006 |
| 7062159 | Device for correcting a digital estimate of an electric signal A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate signal, which derives from the digital estimate, and the electric signa... | 06/13/2006 |
| 7049778 | Inverter control apparatus and inverter control method An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of m... | 05/23/2006 |
| 7049776 | Rotor-position sensor assembly and method for detecting a rotor position An electric motor has a stator and an external rotor (40). Its external rotor (40) has a sensor magnet (54) having a plurality SP of sensor poles (55). The motor also has: at least one rotor position sensor (42, 44) for generating ... | 05/23/2006 |
| 7038420 | Method of regulating an electric motor and corresponding electric motor A method of regulating an electric motor, regulation being implemented with a loop of gain less than unity as a function of a divergence between a setpoint signal for an operating parameter of the motor and a measured value of the same operating parameter of the ele... | 05/02/2006 |
| 7026773 | Multiphase motors with single point sensing based commutation System, method and apparatus for commutating a multiphase motor utilizing a single sensor. Commutation is carried out by employing a sensible system which incorporates phase commutating transition attributes. A motor is started by assigning a starting phase for a gi... | 04/11/2006 |
| 6967459 | Method for controlling or regulating the current in a direct current machine for a fan The invention concerns a method of regulating the current in a direct current machine with which are associated an arrangement for generating a current target value signal, as well as a PWM generator (FIG. 11: 182) whose output signal (PWM2) is control... | 11/22/2005 |
| 6912427 | Programmable limit switch with distributed intelligence A programmable limit switch includes output channels for receiving position data, each position value of the position data representing an incremental advance of a workpiece through a production field, and for producing actuation signals. The channels are connectabl... | 06/28/2005 |
| 6798859 | Branch amplifier card A branch amplifier card for a nuclear reactor control rod drive control system is provided. The control system includes a control processor, a plurality of transponder cards arranged in clusters with each cluster under the control of a branch amplifier card. The bra... | 09/28/2004 |
| 6166501 | Index signal generating circuit An index signal generating circuit for generating a precise index signal free from time shifting even under ambient temperature changes. An index signal generating circuit includes a magnet attached onto the circumference of the rotor of a spindle motor, ... | 12/26/2000 |
| 5856733 | Positioning apparatus The upper limit value and lower limit value of a control target value are alternately supplied to a single D/A converter in synchronism with a clock, an analog output from the D/A converter is compared with an output from a PBR serving as a position detec... | 01/05/1999 |
| 5361025 | Interface circuit for generating and analogue signal to control the speed of rotation of a direct-current electric motor The interface circuit has a single input terminal for receiving an analog or digital control signal indicative of the required speed of rotation of the motor. The type of input signal is recognised by means of comparator circuits. The input signal is proc... | 11/01/1994 |
| 5245262 | Hybrid control law servo co-processor integrated circuit A digitally programmable integrated-circuit analog-signal servo co-processor has digital programming contact pads to which an external microprocessor may be connected, has analog-signal input pads and analog-signal output pads, and includes a plurality of... | 09/14/1993 |
| 5214364 | Microprocessor-based antenna rotor controller Apparatus and method for automatically controlling the rotation of an angularly positionable antenna from one angular position to a desired new angular position. The disclosed technique provides the user with a list of destination indicia, each of which c... | 05/25/1993 |
| 5081408 | Digital servo-control system The present invention relates to a digital servo-control system whose purpose is to control very high precision equipment. The system includes two digital-to-analog converters, one of which is followed by a divider, with the two converters contributing to... | 01/14/1992 |
| 4672550 | Computer controlled machine tool A control system is provided for allowing complex shapes to be machined on a workpiece at high speed. The control system is computer controlled and receives workpiece profile data which are converted into a succession of tool position signals during machi... | 06/09/1987 |
| 4636701 | System for controlling rotation of rotary mechanism in Z-type propulsion apparatus A control system for controlling the rotation of a rotary mechanism such as a propeller housing in a Z-type propulsion apparatus is provided. A command signal and a feedback signal both relating to the rotation of the rotary mechanism are compared with ea... | 01/13/1987 |
| 4636959 | Microprocessor controlled d.c. motor for controlling a postage meter In combination with a postage meter which includes a plurality of loads, a source of supply of motive power for driving the respective loads and instrumentalities for selectively coupling the source of motive power to the respective loads, there is provid... | 01/13/1987 |
| 4635205 | Microprocessor controlled d.c. motor for indexing postage value changing means An improvement in combination with a postage meter including a rotary postage printing drum having apparatus for changing respective postage values to be printed, and including apparatus for actuating the changing apparatus, there is provided an improveme... | 01/06/1987 |
| 4631681 | Microprocessor controlled d.c. motor and application therefor An improvement in combination with a postage meter including a rotary drum having a periphery adapted for feeding a sheet in a path of travel. The improvement comprises: a first device for sensing a time interval during which a sheet is linearly displaced... | 12/23/1986 |
| 4630210 | Microprocessor controlled d.c. motor for controlling a load Apparatus is provided for controlling the velocity of a portion of a load in accordance with a trapazoidal-shaped velocity versus time profile. The apparatus includes a d.c. motor having an output shaft for driving the load; instrumentalities for sensing ... | 12/16/1986 |
| 4594538 | Monitoring circuit for positioning device A speed monitoring circuit is disclosed for an automatic positioning system. This speed monitoring circuit composes a measurement of the actually present speed determined from measurement signals generated by an incremental position measuring device with ... | 06/10/1986 |
| 4570112 | Control circuit for numerically controlled motor A numerically controlled motor provides a drive at a rate which is proportional to rotation of an independently driven shaft. In addition, the ratio of such rate to such rotation can be varied by a control circuit by which, in response to each pulse suppl... | 02/11/1986 |
| 4523137 | Dual mode printer servo with improved velocity signal generator In a dual mode servo for a rotary printer control system for controlling the velocity and position of a rotary print wheel and a print wheel carriage, the analog counterpart of a digital desired velocity multibit character is generated by a bidirectional ... | 06/11/1985 |
| 4483260 | Hydraulically operated linear actuator and an electrical control system A needle bar shifter for a textile tufting machine having an operating rod connected to the needle bar and extending into an hydraulic cylinder for manipulation by movement of a spool in a bore in the rod, the rod having passages to permit flow of hydraul... | 11/20/1984 |
| 4446408 | Control circuit for machine tools A control apparatus for machine tools is provided which comprises a pulsed digital difference detector having one input connected to a digital branch and having a second input connected to a follower drive and having an output, an adding register having i... | 05/01/1984 |
| 4358721 | Bridge positioning device A control for the motor of a mechanism which adjusts the position of the distal end of a passenger loading bridge, which control, when actuated, causes the motor to operate and the adjustment mechanism to move the end of the bridge to a preset position.... | 11/09/1982 |
| 4341986 | Servo control system for the positioning of an apparatus A servo control system for the positioning of a projector comprising a dit current motor having the projector connected to the shaft of the motor, and a digital computer for providing command signals to move the projector to a programmed position at a pr... | 07/27/1982 |
| 4251760 | Gauging and tool control system for production of identical parts A system for duplicating a master part includes a gauge for measuring changes in the dimension therein of a master part to be duplicated and for providing control signals representative of changes from a predetermined dimension. The control signals are ap... | 02/17/1981 |
| 4245298 | System for creating a servo control signal A system for creating a control reference signal for a remote electrical servo device having a movable output unit wherein the velocity and position of the output unit are controlled by the vector magnitude of the control reference signal. This system inc... | 01/13/1981 |
| 4137487 | Method and device for automatically leveling fleeces, slivers, rovings and the like by drawing A method and apparatus for automatically leveling a band of fibers such as sliver, roving and the like by varying the drafting speed of a drafting mechanism responsive to variations in the thickness of the band. Analogue signals are produced by variations... | 01/30/1979 |
| 4119958 | Method for achieving high accuracy performance from conventional tracking synchro to digital converter A synchro to digital converter which has a programmable read only memory (prom) that operates under control of a feed back counter and register. The prom is programmed to generate a digital signal proportional to the converter's inherent systematic error.... | 10/10/1978 |
| 4077000 | Directional antenna azimuth control system A system for selectively aiming a directional receiving antenna in one of a plurality of different directions respectively associated with a plurality of broadcast transmitters differently located in azimuth relative to the antenna in response to the entr... | 02/28/1978 |
| 4031531 | Synchro-to-digital converter Each output signal from a synchro device is applied to an individual voltage comparator through a step-down transformer. Each comparator is biased to a predetermined threshold level and produces an output signal whenever the magnitude of the associated sy... | 06/21/1977 |
| 4016467 | Servodrive apparatus for driving the postage printing drum in a postage meter A servodrive apparatus is disclosed for a postage meter having a postage printing drum mounted for rotation from and to a home position in single revolution increments and a conveyor for transporting individual pieces of mail into operative engagement wit... | 04/05/1977 |
| 3962620 | Switching apparatus A programmer or switching apparatus produces an ON and OFF valued control signal for turning an associated controlled component ON and OFF at preselected points in the variation range of a reference variable. The apparatus includes a reference transducer ... | 06/08/1976 |
| 3949286 | Digital position control A digital position control for linearly moving apparatus driven by a motor includes a command signal generating loop coupled to a motor operative condition control loop. The command signal generating loop provides a digital pulse train signal having frequ... | 04/06/1976 |
