Abstract: An intermediate potential generation circuit for outputting an intermediate potential intermediate between a power source potential and ground potential, including a reference potential generator circuit for generating first and second reference potentials, and a comparator circuit for comparing the intermediate output with the first and second reference potentials. When the intermediate output potential is lower than the first reference potential, the comparator circuit outputs a first control signal at the level of the power source potential to a first MOS transistor supplied with the power source potential to raise the intermediate output potential level. When the output intermediate potential is higher than the second reference potential, the comparator circuit outputs a second control signal at the level of the power source potential to a second MOS transistor supplied with ground potential to lower the intermediate output potential.

Abstract: Magnetic energy is converted into mechanical energy by applying a changing agnetic field to a rare earth alloy of the formula Tb.sub.x Dy.sub.1-x at a temperature in the range of about 0.degree. K. to 170.degree. K., wherein x and the operating temperature are selected to minimize the basal plane anisotropy.

Abstract: An auto-transformer has first and second input terminals and first, second and third output terminals, the second output terminal being connected to a center tap of a coil and the first and third output terminals being connected to such points of the coil which are symmetrical with respect to the center tap. The first and second input terminals are connected to such points of the coil which are symmetrical with respect to the center tap. A first group of loads is coupled across the first and second output terminals and a second group of loads is coupled across the second and third output terminals. By equalizing the load currents to the first and second groups, the total current of the auto-transformer can be made significantly small.

Abstract: A low dropout voltage regulator with quiescent current reduction has a pass transistor coupled for conduction from a positive supply terminal to a regulated output terminal. A first switch is coupled to conduct the base current of the pass transistor to the regulated output terminal. A second switch is coupled to conduct the base current of the pass transistor to ground. A control circuit selects the action of the switches to select the conduction path for base current.

Abstract: A rotor for an electric motor energized by permanent magnet means comprises positioning devices for permanent magnets. These positioning devices consist of positioning rings disposed in the region of each end face of a rotor body and at least one inner positioning ring disposed on the rotor body between the two. The positioning rings comprise positioning webs which extend only over a small part of the length of the outer peripheral surface of the rotor body and which partially define compartments for in each case a permanent magnet. On the one hand, this ensures accurate and simple mounting of the permanent magnet while at the same time it reduces the moment of inertia of the rotor.

Abstract: In an electromagnetic valve, the fixed core of a solenoid has an axially extending annular wall at one end. The movable core of the solenoid is connected to a poppet for closing a fluid passage of a valve seat member and is fittable in the recess defined by the annular wall. The magnetic flux flow path including the annular wall provides reduced hysteresis for the initial part of the stroke of the poppet upon energization of the solenoid.

Abstract: A closed wall having an electrically conductive inner surface forming an electrode. A body is mounted within the wall cooperating with the wall to an orbital path for the flow of fluid, and a second conductive electrode passes through the center of the body. A flux field is induced parallel to the axis of the wall. An inlet and outlet are provided at opposite ends of the helical body for circulation of electrically conductive fluid, through the path perpendicular to the flux field.

Abstract: A voltage to absolute value current converter circuit provides an output current signal which is proportional to the absolute value of the AC portion of an input voltage signal. This conversion is accomplished without the use of a capacitor which allows the circuit to be implemented in integrated circuit form.

Abstract: Disclosed is a reversible inductive energy transfer device for use where efficient transfer of energy between inductors is required. The apparatus is a current amplifying device which utilizes an energy storage inductor which comprises a plurality of series connected induction elements, the inductor being connected in series with a current source and a load inductor. The series connected induction elements are progressively disconnected from the load inductor in a make-before-break manner. The switching may be accomplished by a mechanical switch or by means of superconducting switches, semiconductor switches or PCT switches. The energy storage inductor comprises a single turn or current loop having a plurality of high conductivity, at least partially mutually coupled current paths. The current is continuously or discretely diverted into progressively smaller current paths in order to amplify the current and transfer energy into the load inductor.

Abstract: Prior variable speed constant frequency (VSCF) system controls which operate the VSCF system while it is coupled in parallel with an external AC source across a load have controlled inverter output voltage based only upon the reactive current level supplied by the inverter. This has in turn resulted in the possibility of unstable system operation under load. In order to overcome the foregoing problem, a control for controlling the supply of power to a load from an inverter coupled in parallel with an AC power source across the load senses the real and reactive components of the current supplied by the inverter and the phase displacement of the power developed by the inverter relative to the power developed by the AC power source to derive an angular displacement signal.

Abstract: A magnetic motion electrical generator includes an electrical winding defining a magnetically conductive zone having bases at each end, the winding including elements for the removing of an induced current therefrom. The generator further includes two pole magnets, each having a first and a second pole, each first pole in magnetic communication with one base of the magnetically conductive zone. The generator further includes a third pole magnet, the third pole magnet oriented intermediately of the first poles of the two pole electromagnets and in magnetic communication with the electromagnets, the third pole magnet having a magnetic axis substantially transverse to an axis of the magnetically conductive zone, the third magnet having a pole nearest to the conductive zone and in magnetic attractive relationship to the first poles of the two pole electromagnets, in which the first poles thereof are like poles.

Abstract: A monlithic interface circuit for use with a linear variable differential transformer (LVDT) position transducer. The interface circuit includes a drive circuit for providing an excitation signal of selectable frequency and amplitude to the LVDT primary winding. The interface circuit further includes a decoder responsive to signals induced in the LVDT secondary windings for computing the position p of the LVDT core as a solution to the equation p=K(A-B)/(A+B), where A and B represent the signals induced in the primary winding and K is a constant scale factor. The decoder includes circuitry for rectifying and filtering the secondary signals, a charge balance loop responsive to the detected signals for providing a binary signal having a duty cycle representative of B/(A+B), and an output circuit responsive to the binary signal for providing the position output. The decoder provides excellent scale factor stability and linearity and is relatively insensitive to variations in primary drive amplitude.

Abstract: The present invention relates to an inverter apparatus which controls a rotation speed of an electric motor by varying a frequency of voltage being applied to an induction electric motor. A pulse width modulating signal is generated by comparing a modulated wave signal with a triangular wave signal. The modulated wave signal is obtained by amplifying an error between a magnetic flux command signal having a frequency proportional to a frequency command from an outside source and an integral of a voltage signal being applied to a motor, the voltage signal being an output voltage of an inverter part. The triangular wave signal is a carrier frequency signal of a non-audible frequency, but even if the carrier frequency is made to be an audible frequency, distortion of the output voltage can be minimized. Therefore, the inverter apparatus can drive the motor with low noise.

Abstract: A spindle for a ring spinning machine has an electric motor for rotating the spindle. The electric motor has a stator having a generally square configured stack of magnetically active plates. The corner regions of the stack of the stator have brackets mounted thereon which hold the plates together, and these brackets are fixedly mounted relative to the bearing housing of the spindle bank.

Abstract: A timer setting apparatus for a video tape recorder for setting the timer control data including the date data, the day data, the starting time data, the ending time data, and the input signal selecting data, so as to actuate electronic equipment such as a VTR such that the electronic equipment will properly operate at the proper time on the set date. The timer setting apparatus comprises a timer control circuit which provides timer setting information according to signals supplied thereto from a switch circuit which is operating for setting the timer and desired modes and display means which displays all of the possible choices of items to be registered for setting the timer to facilitate the timer setting operation.

Abstract: The output of an AC power source is converted into DC power through a rectifying stack and an electrolytic capacitor and this DC power is input to a chopper circuit, which includes a first switching element, flywheel diode and a coil. The chopper circuit adjusts the value of the power by changing the duty ratio of the first switching element. The output of the chopper circuit is supplied to an inverter circuit and is applied at the center tap of the primary winding of a transformer. The inverter circuit is of a voltage-oscillating type which includes the transformer, a capacitor and second and third switching elements. As the second and third switching elements are alternately switched on, the inverter circuit converts the received DC power into AC power as its output.

Abstract: An apparatus for recovering an alternating variable having a direct current component in a controlled semiconductor component includes an electromagnetic transducer for measurement having a secondary winding. A sample and hold element has a trigger input, an output and another input connected to the secondary winding of the transducer. A control system for the semiconductor component is connected to the trigger input for feeding trigger pulses from the control system to the trigger input at respective control times of the semiconductor component. A comparator has a first input connected to the output of the sample and hold element for receiving an output signal proportional to the direct current component, a second input connected to the secondary winding of the transducer and an output supplying the recovered alternating variable.

Abstract: A gas cooling system for a bore pack exciter for a power generator in which high velocity, colder cooling gas is obtained from the region within the generator where the entering cooling gas is impelled by the generator fan, and means to direct part of that cooling gas from that flow through the bore pack exciter before return to the interior of the generator for recycling through the cooling unit.

Abstract: A regulation and intensity controller for prolonging the life of an incandescent lamp controls the root mean square voltage across the lamp by converting AC voltage to a DC voltage and by applying the DC voltage to the lamp through a switch and an inductor in series connection with the lamp. The switch is opened and closed according to a duty cycle that will produce a constant average voltage across the lamp. The switch is closed at fixed intervals and is opened by a circuit that is responsive to the instantaneous current through the lamp and to a voltage signal produced by integrating an error signal that represents the difference between the lamp voltage and a reference voltage. In this manner, the average voltage across the lamp is regulated and ripple is kept within a level such that the average voltage is a close representation of root mean square voltage. Additionally, the cycle-by-cycle current through the lamp is closely regulated.

Abstract: The control and monitoring data transmission conductors between the control board and the transistor conversion circuit are formed into a flexible flat cable whose intermediate part is wound on a single magnetic circuit to constitute a common mode inductance designed to compensate the disturbances affecting the printed circuit board due to the potential changes of the semi-conductors generated when switching takes place from the conducting state to the blocking state, and vice-versa.