Abstract: A temperature detection apparatus is provided which comprises at least one light source, light guide and light detector. The light guide is placed in thermal communication with target areas whose temperatures are of interest, particularly for application in electromechanical apparatus where the target area whose temperature is of interest is relatively inaccessible and/or an electrical temperature probe would encounter interference. The light guide itself indicates temperature changes since it only transmits light when the temperature-dependent refractive index of its core exceeds that of its cladding.

Abstract: The invention relates to a clamp for holding a protective device in intimate contact with the winding end turns of an electric motor. Specifically the clamp is a unitary spring member with one end secured between the motor frame and core and the other end biasing the protective device against the winding end turns.

Abstract: In power conversion apparatus such as a naturally commutated cycloconverter for use in converting the output of a variable speed generator to a constant frequency, there is provided an end stop control circuit for ensuring commutation of power switching devices that includes timing wave generators for both rectification and inversion end stops. The timing wave generators are phase locked with the generator outputs but are controllable by end stop bias signal derived from a variable system parameter that may be independent of the source, such as load current to provide prompt protection against converter malfunctions due to excess load currents.Further provided is an excess current detector employing, for each phase, a pair of high slew rate, high current unipolar output op amps connected in a voltage follower configuration with a common pull-up resistor and a common load capacitor to develop a peak current signal representing the greater of the positive and negative peaks of the alternating phase current.

Abstract: An apparatus for measuring the bore diameter of a hollow member whose bore diameter can change in the axial direction. The bore diameter measuring apparatus includes a probe portion, means for inserting the probe portion in the bore, and means for converting a signal supplied thereto by the probe to a bore diameter indication. The probe portion has a housing structure, a plurality of legs which are radially expandable relative to the housing structure, means for radially displacing the legs, and means for measuring the axial displacement of the radial displacing means. The legs are radially displaceable from a retracted position substantially within the radial outline of the housing structure to selected positions radially therebeyond so as to permit entry of the probe portion through a relatively small portion of the bore and expansion radially outwardly in a large portion of the bore.

Abstract: Wound capacitor sections having interconnections between their electrodes are provided wherein each interconnection comprises a conductive sleeve within a first section in conductive contact with one of its electrodes and a conductive foil tab within another section in conductive contact with one of its electrodes, the tab having an end inserted within the sleeve of the first section.

Abstract: A dynamoelectric machine, of the direct current type, with a circumferentially segmented stationary magnetic field structure providing magnetic poles including diametrically opposed pairs of north and south poles, with intervening poles of alternating polarity; rotor conductors extending longitudinally and selectively interconnected in sets providing a plurality of series current paths each traversing a plurality of stator active pole regions; and a pair of brushes for current collection at one or both machine ends.

Abstract: Firing signals for the power switches in static power frequency changers are generated by comparing the integral of the output waveform ripple voltage to a repetitively generated stabilizing signal phase locked to, but having a time dependent magnitude independent of, the component waveforms of the output voltage. The stabilizing signal which changes in magnitude in one direction with time is reset to an initial level each time a firing signal is generated.

Abstract: An electrical connector with weatherproofing and cord gripping qualities provided by a terminal housing having rearwardly projecting fingers that mate within recesses of a cap member, which recesses have tapered rear surfaces so that the fingers are forced inwardly radially to bear against a rubber bushing surrounding a contained conductor that has wire leads connected with contacts within the housing.

Abstract: The firing pulses to the nonload carrying bank only of the naturally commutated thyristor power circuit of a static power converter are retarded to reduce or eliminate the interbank circulating current. In one form of the invention, half wave rectified load current signals are summed with the output waveform reference signal applied to the positive and negative bank firing pulse generators in a sense to retard the pulses in the nonload carrying bank. In another form of the invention, the inversion end stops are used to generate the retarded firing pulses in the nonload carrying bank.

Abstract: A new and improved winding and pole construction is provided for a hydrogenerator field coil, comprising: a pole cap, and a winding having concentric inner and outer helices of conductor. The conductor has a central bore extending its length, whereby coolant is circulated therethrough. Each helix comprises a plurality of turns of concentric layers of conductor, bottom lead-outs and top lead-outs. The inner helix may be connected hydraulically in parallel and electrically in series to the outer helix. In one embodiment of the invention, the top lead-outs of the inner helix are accessed through an access port cut in the top of the pole cap. In this embodiment, a portion of each turn is skewed one conductor thickness so that the lead-outs may be proximate the access port with a minimum of available winding cross-sectional area not used. In an alternate embodiment, the access port is located in the rotor rim with a portion of each turn skewed by one conductor thickness toward the rim.

Abstract: A motor and shipping carton combination is provided in which the carton is folded from the unitary piece of packaging material and includes an end portion comprising flaps joined with bottom and side portions including one such flap that is further folded to provided an inwardly extending shoulder, a downwardly extending wall and a bottom portion bonded to the carton bottom wherein the wall restrains the frame of the motor against axial movement while the motor shaft extends over the shoulder and is limited from substantial contact with the end of the carton.

Abstract: A leakage measuring apparatus and method is herein provided for a gas-cooled, liquid-cooled dynamoelectric machine's cooling system. The apparatus comprises: a liquid coolant reservoir; an integrating vessel; a flow restriction means such as an orifice, orifice covered by a porous membrane, or a needle valve; a pressure relief valve which is hydraulically connected between the liquid coolant reservoir and the integrating vessel; and means for gaging the pressure within the integrating vessel, said pressure indicative of the amount of leakage within the cooling system. The effect obtained by the gaging of the pressure in the integrating vessel is: (1) the integration of the pressure surges resulting from the intermittent activation of the pressure relief valve; and (2) the amplification, for gaging purposes, of the pressure changes in the reservoir, these changes caused by the existence of leakage.

Abstract: A multi-series group capacitor bank has voltage limiters, of the metal oxide type, connected across each individual series group and set at a protection level higher than that of the bank bypass spark gap so the voltage limiters bypass a series group when capacitor fuse clearing causes high voltage build-up in that series group.

Abstract: Firing pulses to the thyristors in the nonload carrying bank of a naturally commutated power circuit of a static power converter are inhibited only after the current therethrough actually goes to zero. Where the thyristors are arranged in pulse groups, the firing pulses to each group are inhibited separately and in some instances not all groups in the nonload carrying bank are inhibited. Termination of current flow through a thyristor group is determined by comparing the group output voltage with a composite signal representative of the intended group voltage which is generated by summing selected portions of the source voltages applied to the group. Further firing of the thyristors in the group is inhibited only after the difference between these two signals exceeds a preset threshold value for an interval at least equal in duration to the thyristor reverse recovery time.

Abstract: A support structure for unitizing coil turns into a single member and bracing each coil of a multi-coil stator dynamoelectric machine. Each stator coil includes several turns relatively concentrically disposed. Each coil turn constitutes two longitudinal conductor portions and two end turn conductor portions. One end turn portion serially connects two longitudinal portions and the remaining end turn portion serially connects one of the longitudinal portions with a longitudinal portion of a concentrically adjacent coil. Each coil preferably lies in a plane defined by a portion of a cylinder and the coils are disposed in a cylindrical arrangement having a longitudinal axis therethrough such that one longitudinal portion of the outermost coil turn lies along the outer radial extent of the cylindrical arrangement and the remaining longitudinal portion of the outermost coil turn lies radially nearer the longitudinal axis of the cylindrical arrangement.

Abstract: An electric plug for use with an electrical cord and characterized by a base and cover of separately molded dielectric material, the base having a central cord-receiving opening and having electric conductor prongs extending from one end thereof and having a pair of integral posts extending from the other end thereof and on diametrically opposite sides of the cord opeing, a tubular cover enclosing the base and having an open end closed by said other end of the base and having a closed end with apertures through which the conductor prongs extend, and a pair of cord-clamping members adjustably mounted on the posts.

Abstract: An integrated drive-generator system in which a casing housing a constant speed drive unit is attached to a casing housing a generator unit with means being provided to isolate mechanically debilitating debris within the unit which expelled it and so avoid damaging the other unit. The units share a common lubrication-coolant fluid system which provides fluid circulation to both from a reservoir. Expelled debris is isolated within the faulty unit by a barrier partition which separates the interiors of the units' casings and supports a breather which promotes fluid communication between the units' casings and permits a single pressurizing device to service both units. A scavenge pump for extracting fluid from each unit and transmitting it to the reservoir is located within the unit it services. As a result, if debris expelled by either unit becomes entrained in the fluid of that unit, only the scavenge pump within that unit will be damaged or jammed and system repair will be limited to the faulty unit.

Abstract: Cryostability is achieved by a superconductive rotor of a dynamoelectric machine constructed in accordance with the invention. The superconductive rotor comprises: a rotor shaft; a support rim; a plurality of slot teeth formed at the outer periphery of said rim, said teeth located between and defining a plurality of rotor slots; and a plurality of slot assemblies, one within each rotor slot. Each slot assembly comprises: a plurality of stacks of superconductors, each superconductor within a stack having insulation on only two of its sides and being disposed one on top of another in generally radial direction relative to the rotor shaft; a plurality of insulative separators, one between each pair of stacks; a top insulative strip and a bottom insulative strip, respectively radially above and below said conductor stacks; and a side panel on either side of the slot assembly and next to a slot tooth.

Abstract: The quality of the output waveform of a cycloconverter is greatly improved by a feedback loop that compensates for the inherent nonlinearity of the converter forward gain. A feedback signal, preferably proportional to the current through the shunt capacitor of the converter output filter, is multiplied by a compensating signal generated by full wave rectification of the cycloconverter AC reference signal with the resultant signal summed in opposition with the reference signal before it is applied to the converter control circuit. Alternatively a more precise compensating signal can be generated through 90.degree. phase shifting and negative going full wave rectification of the sinusoidal cycloconverter reference signal.

Abstract: A vapor trap is provided for use in a liquid coolant supply pipe of a superconductive generator. The supply pipe has interiorly located, a flow constriction, an annular liquid coolant dam, and means for blocking the vapor flow through the central portion of the supply pipe. These act cooperatively to prevent the coolant vapor within the generator from flowing back through the supply pipe. This would be an undesirable condition most likely to occur during transient operating conditions when the normal flow of liquid coolant is temporarily stopped.