Abstract: A rotary dynamo electric machine comprising a stator, a rotor rotatable relative to the stator and having an air gap between the rotor and the stator. The permanent magnet poles of the machine each include a two part flux shunt formed from a material of high saturation flux density, each first portion extending from the back iron, towards the air gap of the machine and being magnetically continuous with the back iron, each first portion being adjacent that end of its respective permanent magnet which is the strong tip end in use. Each shunt second portion extending from the respective shunt first portion circumferentially of the machine towards that end of the respective permanent magnet which is the weak tip end in use, and engaging the air gap face of the respective permanent magnet each second portion in that region thereof which is engaged with the respective permanent magnet being shaped such that its cross-sectional area increases substantially linearly from a minimum at its free end.

Abstract: A DC to DC power supply including an energy transferring snubber circuit produces a changing magnetic flux by opening and closing a switching element to interrupt current flow in a first inductor. A current is induced in a second inductor in response to the changing magnetic flux. A first capacitor is charged with a current due to a first potential appearing across the switching element when the switching element is opened. The current induced in the second inductor and the current from the first capacitor is conducted to the load when the switching element is closed. A snubber circuit minimizes the first potential appearing across the switching element while transferring energy to the load.

Abstract: A two-phase DC brushless motor comprising a stator wherein a pair of stator cores having a plurality of salient poles on a stator yoke mounted on a mounting base plate and a coil body are provided so that the coil body is positioned between the pair of stator cores and the salient poles of the pair of stator cores are angularly spaced at an electric angle of 180.degree. from each other, and a rotor provided with a permanent magnet having N and S poles arranged in the number equal to that of the salient poles of the pair of stator cores in a circumferential direction so as to oppose to the salient poles leaving a slight gap therebetween, wherein each of the salient poles is shaped to have a notched portion in one of opposite corners, in a direction of rotation of the rotor, of the outer end of the salient pole, and further comprising a position detection unit opposed to the permanent magnet for detecting a rotational position of the rotor to switch an energizing direction relative to the coil body.

Abstract: Elements which exhibit good thermal conductivity are disposed in contact with permanent magnets of an electric motor. These elements absorb heat from the magnets and reduce the rate at which the temperature of the magnets increases. The elements can be provided with fins and the like to increase the rate at which heat is released from the elements.

Abstract: A starting electric motor comprising: an armature rotary shaft on which an armature is mounted; a commutator mounted on the rear end portion of the armature rotary shaft; power supplying brushes slidably held on the commutator; brush holders which hold the brushes, respectively; a rear bracket of resin which rotatably supports the armature rotary shaft in association with a front bracket; a yoke having magnetic field means which is fixedly held between the rear bracket and the front bracket; a conducting base of electrically conductive material on which the brush holders are mounted, and which is held between the yoke and the rear bracket; through-bolts inserted into the rear bracket and the front bracket, tightening the yoke and the conducting base together; and metal plates provided between the seats of the through-bolts and the outer surface of the periphery of the rear bracket.

Abstract: A monolithic integrated circuit containing an inverting/non-inverting voltage doubler charge pump circuit is disclosed for converting a unipolar supply voltage to a bipolar supply voltage of a greater magnitude. The unipolar input voltage is placed across a first external transfer capacitor by a first set of MOS switches during a first time period. The unipolar input voltage source is placed in series with the first transfer capacitor and this series combination of voltages is placed across a first external reservoir capacitor by a second set of MOS switches during a second time period. The voltage appearing across the first external reservoir capacitor is placed on a second transfer capacitor during the first time period by a third set of MOS switches. The voltage across the second transfer capacitor is placed into a second external reservoir capacitor with its polarity inverted by a fourth set of MOS switches during the second time period.

Abstract: A linear force actuator system for stabilizing a support structure employs a linear dc motor whose primary winding is driven by a pulse width modulation control signal representative of a force input, through which the secondary member of the motor which acts as an inertial mass, is to be controllably translated. For improved control accuracy, the actuator system of the invention employs a pair of feedback loops, one of which monitors the current in the motor's primary winding to maintain a constant force output to the secondary member and a secondary of which monitors long term deviations from the center of the secondary member and corrects for centering offsets. An opto-electronic position sensing arrangement monitors the movement of the secondary member whereby precise control of commutation of the coils of the primary winding and a smooth translation of the secondary member are obtained.

Abstract: A relates to a band-gap reference-voltage arrangement includes a MOS differential amplifier (OA2) having two inputs and one output. A first bipolar transistor (Q3) has its base/emitter path coupled between one input of the differential amplifier and a specific junction point and has an emitter-collector path arranged in a first current path for carrying a first current. A second bipolar transistor (Q4) has its base/emitter path connected in series with a resistor (R6) between the other input of the differential amplifier and said junction point and has its emitter-collector path arranged in a second current path for carrying a second current. First and second transistors (P1), P2) supply said first and second currents to the first and second current paths.

Abstract: An image forming apparatus comprising a first body and a second body which are openable or separable from each other. The apparatus contains a plurality of developing devices, each of which is movable between its developing position for developing a latent image on an image bearing member of the image forming apparatus and a retracted position where the developing device is retracted from the developing position. At least the developing device that is located at its developing position when the apparatus is closed, is moved away from the image bearing member in response to an operation for opening the second body relative to the first body.

Abstract: An armature is formed by laminating cores having through window portions which are provided in the vicinity of the surface on the slot open sides of tooth portions. The through window portions have partly opened portions, respectively. Coils are wound in slots of the laminated core. By pressing the through window portions, cut-open portions of the slot are deformed to provide outwardly curved projecting portions spaced from the coils to prevent the slipping-out of the coils.

Abstract: A voltage regulator for AC single phase and three phase systems. An output voltage is controlled by controlling a preset stepped addition to or subtraction from the input voltage. The controlled addition or subtraction is performed by a series injection transformer whose secondary is in series with the input voltage and whose primary is controlled by a microprocessor based switch matrix. The switch matrix imposes various voltage levels and phasing on the primary winding so as to produce a regulated system output voltage.

Abstract: A rectifier assembly for use in the rotor of an electrical generator is provided with a plurality of generally disc-shaped diode packages arranged in a stack along a common axis. Radial bus bars are positioned between the diode packages and extend radially beyond the diode stack. Electrically and thermally conductive through bolts extend between a pair of end members on opposite ends of the diode stack and are electrically connected to the radial bus bars. Each of the through bolts includes a longitudinal opening for receiving cooling fluid. Selected ones of the through bolts are held in tension between the end members, thereby axially compressing the diode and radial bus bar stack. Spring terminals are provided for electrically connecting the through bolts to an external circuit and the entire assembly is conveniently packaged as a plug in module.

Abstract: A resonant circuit successively assumes charging and discharging conditions which form the primary circuit of a transformer in a power pack constructed according to the principle of a resonant converter, and a switch-over pulse is generated after each initiation of the charging condition and depending on the existancee of current and/or voltage values for resonance in the resonant circuit, and the switch-over pulse ends the charging condition by using a switching means and initiates the discharging condition so as to produce an improved resonant converter.

Abstract: The power converter (10) serves for conditioning an electricity supply for a load (12), whereby the supply is derived from a power source (11) and is adapted to the requirements of the load (12) in respect of the electrical values. The converter (10) comprises in its simplest version exclusively a transformer (13) and an inductive resistor connected in series with the latter and designated as an actuator (14). This actuator (14) is constructed from two coaxially-arranged, identical and annularly closed variety cores (111, 112), which are individually surrounded by partial windings of an induction winding (150) and jointly by a control winding (117). The latter (117) is joined to a control system (30), which by means of a control current (I) sets an inductivity value (L) of the actuator (14), which can be varied within wide ranges (1.100).

Abstract: An electromagnetic induction machine having inductively coupled primary, secondary and tertiary branch windings. The exciting current of the primary branch is transformed or reflected, via the inductive coupling, to an electrically separate secondary or tertiary branch. This reflected current in the isolated branch is sustained by connecting a capacitive load impedance to it. Thus, a floating parallel resonant circuit is formed which supplies the needed reactive component in lieu of the primary branch. Different winding techniques are then incorporated in the separate branches to maximize the available winding space and provide improved operating or performance characteristics.

Abstract: A low loss synchronous magnetic drive system for high pressure, high horsepower applications is disclosed. A carrier member driven by a drive motor carries spaced apart sets of drive magnets with the magnets of one set being of opposite polarity to the longitudinally aligned magnets of the other set. An output shaft carrying driven magnets oriented similarly to the drive magnets is also provided. A metallic hyperbaric barrier separates the drive and driven magnets. The barrier includes an outer cylinder having circumferentially spaced, radially directed, narrow slots extending therealong. Within the cylinder is a plurality of axially adjacent annular laminations insulated from each other. During operation the combination of the slotted cylinder, the laminations and the magnet arrangement keeps eddy currents generated in the barrier at a minimum, ensuring a high efficiency drive operable at speeds and pressures heretofore unattainable.

Abstract: An electric load levelling system includes a plurality of individual modules for storing and supplying AC electrical power. Each module is preferably contained within a separate enclosure and includes a plurality of individual electrochemical storage cells for storing DC electrical energy. Each enclosure includes a power conversion mechanism for converting input AC power for storage in the enclosed DC cells, and output DC power from the cells to AC for supply to an input/output line. The system is capable of storing electrical energy during periods of off-peak demand, and outputting such stored energy during periods of peak demand. The individual modules function as an "AC battery" having an AC input and output, and are adapted for mass production and ease of interchangeability.

Abstract: An electrical generator connection, to connect coil ends, and a method of making the same. A header cap having a spherically shaped portion is brazed to each coil end to be connected. A pair of connector bars, each having a pair of similarly sized spherical seats, receives the spherical portion of each coil end header cap. Electrical and mechanical connection is provided by bolting the two connector bars together.

Abstract: In a method of and apparatus for connecting a storage battery to an elevator inverter, the storage battery being connected to a d.c. circuit of the elevator inverter power stage, a voltage in the d.c. circuit is higher than the battery voltage. Power flows bidirectionally from the storage battery to the d.c. circuit and vice versa. When power is flowing from the storage battery to the d.c. circuit, the battery voltage is matched to the voltage in the d.c. circuit by the aid of a semiconductor switch, by means of which an energy store is charged, and a diode, by which the energy in the energy store is discharged into the d.c. circuit. When power is flowing from the d.c. circuit to the storage battery, the voltage of the d.c. circuit is matched to the battery voltage with the aid of a second semiconductor switch, by means of which the energy store is charged, and a second diode, by which the energy in the energy store is discharged into the storage battery.

Abstract: The present invention achieves the above objects, among others, by providing apparatus for converting a supplied AC input signal into an AC output signal having a selected lower frequency than the frequency of the AC input signal, which apparatus translates individual half cycles of the supplied AC input signal to an intermediate output signal with selected amplitude and polarity such that during successive pairs of first and second periods, each such period corresponding to a predetermined number of half cycles of the AC input signal, the translated half cycles of the AC input signal all have the same first selected polarity during each first period and have the same second selected polarity during each second period, with the first and second polarities being opposite. The apparatus filters the intermediate output signal to develop the AC output signal having the selected lower frequency.