Abstract: A permanent magnet motor designed for d-c operation with pulsed current supply through at least two, and preferably four or more stator coils, has a rotor magnetized such that, with respect to 180.degree. electrical, about 120.degree. are magnetized in one magnetic polarity, and the remaining about 60.degree. are magnetized with dual polarity to provide a monopole zone of magnetization and a dipole zone of magnetization, a galvano-magnetic sensing element being exposed to the path of circumferential rotation in which the same polarities of the dipole and monopole zones are contiguous for control of pulse current flow through the windings of the motor. A tachogenerator winding may additionally be included in the air gap, exposed only to the rotary path of one magnetic pole of the dipole zone and the monopole zone.

Abstract: An operating lever assembly for a multifunction switch wherein the lever carries a rotary switch along its length and a push action switch at its end. The operating member of the push action switch is movable longitudinally relative to the lever to operate the push action switch and rotatable about the axis of the lever to operate the rotary switch.

Abstract: A system for driving an inductor type synchronous motor for minute control thereof which includes an inductor type synchronous motor having a circuit for driving m phases of driving windings and first magnetic teeth. A second group of magnetic teeth is provided facing the first group of magnetic teeth. Apparatus is provided for feeding electric current from a DC power source to the driving windings of the respective phases. The driving winding for one phase intersects the flux of a partial set of first magnetic teeth or at least two magnetic teeth to provide a flux-interlink. A group of solid state switches are interposed between the source for producing the electric current and the driving windings of the respective phases. A distribution pattern generator generates patterns in response to a command signal and controls the on-off states of the solid-state switches with the noted patterns to thereby form the electric current into trigonometric-functional-patterns.

Abstract: A multiple function image processing system having both light-lens and flying spot beam for producing latent electrostatic images of originals on a photoconductive surface. The images are developed and transferred to a copy substrate material. A flying spot image reading beam enables the developed images to be read. Where multiple copies are desired, the light/lens provides the first image with later copies provided by the flying spot beams which scan each developed image and, using image signals produced by said scanning, write the next successive image until the desired number of copies are produced. Where a relatively large number of copies are desired, the image signals produced by scanning the developed image are stored in memory, which is thereafter used as the source of image signals for subsequent copies.

Abstract: At least a part of the portion of a cleaning device to contact to the image retaining portion in a copying machine of a transferring system is composed of conductive composite fibers consisting of at least one conductive layer containing conductive fine particles and at least one nonconductive layer.

Abstract: A battery charging apparatus has a control circuit which controls the rate of input of AC power through a synchronous switch--a saturable core reactor, magnetic amplifier or a pair of anti-parallel silicon controlled rectifiers. The operation of the charger is such that the length of the charging program can be predetermined, and when the charging program is initiated a survellance system functions to determine that the charging current during the program, and particularly at the end of the program, is within anticipated limits. If the charging current is not within anticipated limits, an alarm indicator is latched on, giving the operator an indication of potential battery problems, and/or an indication of a battery/charger mismatch whereby one is over or under rated with respect to the other.

Abstract: A direct-current motor is energized through a diode in the emitter-base network of a transistor and through the emitter-collector network of another transistor which is held conductive by the driving current but which automatically limits the current flow through the motor. When the circuit is de-energized, a self-braking effect is established by the circuit which is substantially symmetrical for reversing operation of the motor.

Abstract: An inverter (34) which provides power to an A.C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A.C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the notches are varied to determine the average energy content of the overall waveform. Through this arrangement, the operational efficiency of the A.C. machine is optimized. The control circuit includes a micro-computer and memory element which receive various parametric inputs and calculate optimized machine control data signals therefrom. The control data is asynchronously loaded into the inverter through an intermediate buffer (38). In its preferred embodiment, the present invention is incorporated within an electric vehicle (10) employing a 144 VDC battery pack (32) and a three-phase induction motor (18).

Abstract: A synchronization arrangement for delaying excitation of the field winding (5) of a brushless synchronous motor until the motor rotor has run up approximately to synchronous speed in which the appropriate moment for applying the field excitation is determined by monitoring two signals respectively representative of the currents in two rectifying devices (11, 15) separately connected, oppositely poled, across the motor field winding.

Abstract: The present invention concerns apparatus for precisely driving the rotors of precision gyroscopes such as small, flexure mounted rate of turn or inertial gyroscopes. The rotor is servo operated subsynchronously whereby a reference frequency generated by a spin frequency reference generator is synchronized with a precisely stable frequency standard, assuring the maintenance of constant rotor speed and permitting precisely calibrated gyroscope torquing. The gyroscope motor rotor is thus spun at a subsynchronous frequency so that the poles in the hysteresis ring are constantly rotating about the ring and their effect on average magnetic bias is averaged substantially to zero. Further, the drive motor is operated at peak efficiency because its excitation is automatically and closely adjusted to be just sufficient to generate only the necessary motor torque for subsynchronous operation.

Abstract: The present invention provides a laser scanning apparatus for modulating a laser beam with a modulator into plural independent modulated beams and scanning a plane with the plural beams. In order to prevent a change of the intensity of each beam spot on the scanned plane depending on the exit angle of the beam from the laser, there is provided a converging lens of a focal length f1 between the laser and modulator in such a manner, when the distance from the beam exit of the laser to the converging lens is selected equal to f1+.DELTA.S and the distance from the lens to the modulating point of the modulator is selected approximately equal to f1, as to satisfy the following relation:.vertline..DELTA.S.vertline.<.pi..multidot.Bi.sub.2 /4.lambda.wherein Bi is the diameter of the laser beam and .lambda. is the wave-length of said laser beam.

Abstract: A torque control for an electromechanical torquing device of a type wherein there occurs variable clearance between a rotor and field. A Hall effect device senses the field present, which would vary as a function of spacing between field and rotor, and the output of the Hall effect device controls the power applied to the field so as to provide a well-defined field and thus a controlled torque to the rotor which is well-defined.

Abstract: An excitation system for a synchronous machine comprising an exciter having its output connected through a current relay in parallel with a starting-protecting unit. The starting-protecting unit includes parallel branches, each comprising a series-connected resistor and thyristor switch having a voltage-sensitive threshold element connected between its anode and gate. A turn-on unit for the parallel branches of the starting-protecting unit includes a voltage-sensitive overvoltage detector connected in parallel with the exciter output, in which the voltage setting is lower than that of the threshold element of the parallel branches of the starting-protecting unit. A memory unit; and a pulse-forming unit. The output of the overvoltage detector is connected through the memory unit to the input of the pulse-forming unit. The output of the pulse-forming unit is connected via the contacts of the current relay to the gates of the thyristor switches in the parallel branches of the starting-protecting unit.

Abstract: A three-phase electric motor is partially braked as a result of self-excitation when the power supply is disconnected and a capacitor is connected across one of the windings. The motor is then rapidly brought to a standstill by applying a short-circuit (or connecting a relatively low impedance) across one or both of the other windings, and essential condition being that the short-circuit is initiated within a predetermined range of values of phase angle in a waveform of the self-excitation. Preferred ranges of phase angle are established for selected configurations of mechanical and electronic short-circuiting switches.

Abstract: In a commutatorless motor device including a synchronous motor driven through a frequency converter including gate-controlled electric valves, and a device for detecting the phase voltages of the synchronous motor, a device for dividing the detected phase voltages by a signal corresponding to the speed of the synchronous motor. The outputs of the dividing device are fed to a logic signal converter which converts them into signals corresponding to the position of the rotating magnetic field of the synchronous motor. The outputs of the logic signal converter are passed through a logic circuit and a gate-pulse generating circuit for generating gate pulses for controlling the electric valves of the frequency converter.

Abstract: An electrostatic recording apparatus which is capable of composite reproduction, having an original projecting device for forming an electrostatic latent image of an original picture on the surface of a photosensitive member by scanning and projecting an original on a copy board, and a picture-forming device for causing a memory to read electric signals of characters fed from an external source and then forming an electrostatic latent image of characters on the surface of the photosensitive member based upon the thus read signals. The apparatus further comprising a position signal generator for producing position signals which give positions of the original picture on the copy board in relation to the scanning for projection, and a control signal generator for producing control signals responsive to the position signals and printing section signals which give sections in which the picture-forming device is allowed to effect the printing.

Abstract: This disclosure is concerned with a motor technique for generating speeds that are fractions of synchronous speeds, through novel time-staggered selected half-cycle energization of a plurality of magnetic poles by a controlled switching sequence, generating such a fractional motor speed that would otherwise have to be produced by a much larger number of magnetic poles.

Abstract: A standard, unmodified AC induction motor has its stator winding energized from a sine wave source through a signal-responsive wave modifier operative to control the portion of each cycle of the sine wave which is coupled from said source to the stator winding. A motor current demodulator, responsive to efficiency-related parameters of the inrush current to the stator winding each time the current in the stator winding increases from zero, produces a control signal for the wave modifier, which signal varies with a decrease in motor operating efficiency below the maximum inherent efficiency of the motor to increase the field density of the stator winding in response to increases in motor load and to decrease said stator field density in response to decreases in said load and/or to maintain the most energy-efficient stator field density at rated motor loads when the voltage magnitude of the sine wave source increases or decreases from its nominally rated magnitude.

Abstract: Error recovery due to bin overflow in a document reproducing system such as an integrated copier system having a Cycling Automatic Document Feed (CADF), a multibin collator module and a bin unloading mechanism, is effectuated by attaching one or more spare bins or a second collator module and a controller to the reproducing system. Overflow copies from the multibin collator are loaded into the second collator module. A collated set of copies are formed by combining copies from the multibin collator and the second collator module.

Abstract: A control apparatus of a synchronous motor having armature windings and perpendicular field windings comprises a frequency converter of a cycloconverter which converts the frequency of an alternating current and supplies the converted current to the armature windings of the synchronous motor. On a shaft of the synchronous motor are installed a speed detector, a position detector, and a speed instruction circuit. The frequency converter is controlled in accordance with the outputs of the speed detector, the position detector and the speed instruction circuit. An alternating current excites the field windings, so that a field of magnetic force is rotationally generated. The direction of the magnetic field is determined depending upon the output of the speed detector.