Abstract: A phase adjustment circuit of a power converter, the power converter, and a control method of the power converter are provided. The control method includes following steps. A delay signal is generated according to an error signal, and the error signal is associated with an output voltage of the power converter. A difference between the error signal and the delay signal is amplified. A control signal is provided according to the amplified difference and the error signal, and a phase of the control signal leads a phase of the error signal. The control signal serves to improve a response speed of the power converter.

Abstract: A motion control device for controlling a motor is presented. The motion control device is operable to scale or adjust an input relative to an input range that is based on calibration values and to use that scaled input to produce a drive signal to drive the motor. The motion control device performs a self-calibration to produce the calibration values. The self-calibration involves measuring home position and full travel position values for the motor.

Abstract: An electric mirror control device provided with a proportionality constant conversion means for converting the proportionality constant of a detection output voltage to the angle of a mirror surface to be positive or negative. When an up-down sensor and a right-left sensor for detecting the angle of the mirror surface have a plurality of specifications, each of which has a different proportionality constant of the detection output voltage to the angle of the mirror surface, controller determines the specification of the angle sensors based on whether the proportionality constant of the detection output voltage output via the proportionality constant conversion means is positive or negative, and controls an up-down motor or a right-left motor in accordance with the determined specification stored in advance.

Abstract: A feedback apparatus for a vehicle air-conditioning actuator is provided. The feedback apparatus includes a cover plate including a thin plate resistor formed on the bottom thereof, a small case combined with the cover plate, including an assembly protruding portion formed in one side thereof, a plate-shaped rotation slider interposed between the cover plate and the small case, including a third axial hole and an opening whose size is about a quarter of the total size, a wiper whose contact front end is exposed in the opening of the rotation slider and rear end is fixed to the bottom of the rotation slider to rotatably contact a thin plate resistor formed on the bottom of the cover plate, a terminal assembly having connection pins for receiving external signals in which connection pins combined with the cover plate is formed. Since a contact between the wiper and the thin plate resistor is accomplished in a sealed case, there is little possibility of altering an initial set position due to an external shock.

Abstract: An air conditioning valve actuator for a motor vehicle operating on an electric step motor with a permanent magnet capable of delivering mechanical power at least equal to 50 mW, and a reduction unit for decreasing the amplitude of the angular pitch and increase the output torque. The motor is defined by the following relationship: 10?6<?2/R0<, wherein: ? is the torque constant, proportional to the magnet volume and, R0 is the characteristic coefficient of the volume of copper and the length of the average turn of the coils, in which R0=?.Lsp/(Scu.?), ? being the resistivity of copper, Lsp being the length of the average turn of a coil, Scu being the copper section of a coil and ? the filling coefficient of a coil. A controller is cooperative with the motor power supply enabling to accelerate gradually the frequency of the supply of the windings.

Abstract: An actuator system having a controller, a motor, and a feedback device, wherein an output shaft of the motor is connected to the feedback device. The controller directs the application of power to the motor and the feedback device produces a signal indicative of the position of the output shaft. Advantageously, the signal may be read by the controller when the motor is not in motion.

Abstract: DC motor-driven valve apparatus, comprising, in combination a valve unit having fluid input and output porting, the valve unit having a valve shaft rotatable between primary and secondary positions corresponding to different flow states; a reversible DC motor having a rotatable output shaft, gearing connected in the drive path between the motor output shaft and valve shaft, such that the ratio of motor shaft rotation to valve shaft rotation is in excess of 100; and circuitry including a potentiometer operatively connected to the valve shaft and to the motor to provide an output signal which varies with degree of valve shaft rotation for reversibly controlling the motor to terminate motor shaft rotation when the valve shaft alternately reaches the primary and secondary positions.

Abstract: Feedback potentiometer-type servoactuator uses the ring gear of a planetary gear system to drive the wiper across a resistive arc of less than 360.degree. where the actuator has a travel of multiple turns. The ring gear is supported by spaced struts in the actuator housing.

Abstract: 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 detector, and a motor is driven by the difference voltage, thereby positioning the control object. In this case, control of the moving direction and drive/stop of the motor is performed by a combination between the setting states of the upper and lower limit values and the polarity of the difference voltage, and the switching operation of the selector is stopped during a control operation, thereby making it possible to smoothly perform the control operation at a high speed. The control system can be digitized as a whole by detecting a position by an encoder, and integration of the system can be enhanced, thereby realizing a compact and stable control system.

Abstract: An actuator system has a motor and an output shaft connected to a potentiometer that provides shaft position information. The motor and potentiometer are electrically connected to a common power supply. A microcomputer controls the application of power to the motor and potentiometer so that feedback signals from the potentiometer, indicative of shaft position, can be read when desired without moving the shaft. The motor is prevented from moving either by setting both motor terminals high during a read, or by applying power pulses during a read which are too short in duration to allow the motor to start moving.

Abstract: An air-conditioning equipment for a vehicle includes first and second local shutter control units each having a motor for moving a shutter, a drive circuit for driving the motor, a controlling device responsive to a heat load signal to control the drive circuit to thereby control the shutter in accordance with the heat load signal, and a blower control unit responsive to changes in opening of the shutter to control the rate of an air flow. Since separate shutter control units are provided, each shutter can be controlled independently, thus preventing all the air-conditioning functions from halting simutaneously otherwise occurred in conventional air-conditioning equipment having a central control unit or microcomputer.

Abstract: A servosystem for controlling the voltage in X-ray generators includes a system for controlling the voltage of the primary of a high voltage transformer for feeding the X-ray tubes. A servosystem controls the position and adjustment of acceleration, uniform movement and braking, and supplies a direct current motor, of the permanent magnet type and of standard manufacture, which moves the brushes of a three-phase or mono-phase toroidal autotransformer, the operation of which fixes the primary voltage of the high voltage transformer which, in turn, supplies a voltage to an X-ray tube.

Abstract: A feedback potentiometer type servoactuator having a plastic housing shell with small high RPM low voltage motor and non-metallic gear reduction train for driving an output shaft. The shell and cover plate provide structural support for gear journalling and the cover plate has an electrically resistive plastic strip baked onto the inside of the cover. Contacts mounted on the output gear for movement therewith wipe the resistive strip to provide variable resistance for an output shaft position feedback signal. The motor pinion and first stage reduction gears are made of urethane thermoplastic elastomer, the second stage gears of acetal plastic and the final gears are formed of 30% glass fiber filled polyester plastic for providing quiet running and long gear life.

Abstract: A linear motion encoder which employs a potentiometer type motion detector. It includes an elongated rectangular or cylindrical housing in which are one or two rails for guiding an insulated block to move lengthwise of the housing while being moved by a shaft connected to the block via an anti-backlash spring means. The block carries wiper contacts which respectively contact a fixed resistance element and a fixed commutator strip mounted on one wall of the housing or on the rail. An analog to digital circuit may be disposed in the housing to apply a reference voltage to opposite ends of the resistance strip. The circuit takes a linearly variable analog voltage from the commutator strip when the block moves lengthwise inside the housing driven by the axially moving shaft.

Abstract: In an improved method for determining the position of a measuring sensor or probe (1), such as a probe for ultrasonic examination of an object (2), use is made of at least two mutually crossing bars (3a, 3b, 3c) of electrically conducting material in constant sliding, electrical contact with each other. At least one bar (3a) is kept fixed in relation to the object (2) to be examined, and at least one bar (3b, 3c) is kept fixed in relation to the probe (1). By measuring the electrical voltage drops in the bars, the positions of the crossing points (4ab, 4ac) between these bars and thereby the actual position of the probe in relation to a reference system (x, y) on the surface of the object are determined. By using at least three bars, it is possible to determine the position coordinates (x, y) as well as the angular direction (v) of a freely movable probe in relation to objects to be examined having plane, cylindrical or double-curved surfaces.

Abstract: A position control system capable of relatively great positioning accuracy includes a universal electric motor and a gear box for transferring the motion of the motor and an object being positioned. The position control system includes a conductive brush which moves with the object being positioned and which slides on a plurality of electrical contacts which are part of a control circuit the control circuit includes a plurality switches for selection of the desired position of the object and resistance networks which serve to apply various values of voltage to voltage sensitive motor speed and direction controls which in turn control the speed direction and stopping of the motor hereby controlling the position of the object.

Abstract: Multiple purpose feedback control system comprising and characterized by a detecting means for detecting the controlled variable and converting the detected variable into a feedback signal output; a signal converting means for receiving the feedback signal from the detecting means and amplifying the signal for input into a balancing motor to convert the signal into rotary displacement in proportion to the said signal; a limit control switch for receiving the rotary movement to compare the movement with a desired value; a pair of electro-magnetic devices for transmission actuated or controlled by the limit control switch at upper and lower limits; a pair of electro-magnetic switches actuated by an on/off solenoid; an electro-magnetic device for braking actuated or controlled by the electro-magnetic switch operated by said control switch; a drive means for driving the main shaft of a control gear means; a control gear set moved by the coupling of the pair of electro-magnetic device and braked by the braking ele

Abstract: Actuator for operating the arcuately moving levers of a postal meter in accordance with output signals from a computing postal scale. The actuator includes drive shoes which engage the levers and are driven along a linear path generally parallel to the arcuate path of the levers. The drive shoes are advanced and retracted by lead screws driven by stepping motors to move the levers in incremental steps. Position encoders provide signals indicative of the positions of the levers, and these signals are combined with the signals from the scale to control the operation of the actuator.

Abstract: A chair for dental treatment having a seat proper with operating mechanisms, comprising power circuits for driving the respective operating mechanisms, position detectors for detecting the movements of the seat proper, a power supply connected to said position detectors, a presetting section connected to the position detectors, memories connected to the respective position detectors, manual control sections connected to the respective power circuits, an automatic control section connected to the power circuits, switch sections provided in the respective power circuits and adapted to close when the respective manual control sections are in operation, memory-reading sections connected to the respective memories, switches provided in the respective power circuits and adapted to close by a momentary operation of the automatic control section and to open by the action of the respective memory-reading sections, and the former switch sections being connected in parallel with said latter switch sections respectively.

Abstract: A multi-range, self-balancing instrument using a Zener diode circuit and a phase compensating circuit is disclosed. The Zener diode circuit is capable of generating a white noise, which is effectively applied to the self-balancing system whereby the dead zone is maintained constant irrespective of the range. The phase compensating circuit, comprising a non-inverting input amplifier, is capable of compensating for the phase lag of the self-balancing instrument by adjusting the amplification factor of the amplifier without affecting the stability of the servo amplifier system.