Abstract: A rotary power module construction especially useful in computer room application. A motor-generator set consisting of an induction motor and synchronous generator is mounted vertically and a direct drive is provided between the components by an electrically insulating coupling. A flywheel is mounted on a shaft of the synchronous generator to provide a maximum ride through condition for short term power outages. A plurality of spider-like leg members envelop the flywheel providing retainment protection for the flywheel as well as providing a suitable support for the synchronous generator. The spider-like leg members are anchored to a plate member which is secured to a non-rotating part of the induction motor. The motor-generator set is encased within a housing that is serviced only from the front of the housing, thereby occupying a minimum amount of space in the computer room.

Abstract: This invention relates to a motor and a motor apparatus and is so constructed that end rings and bars composing a squirrel cage rotor of the motor are formed in a hollow or grooved shape and superconductive materials are filled within said end rings and bars to form looped circuits, which are symmetrical relative to a center line of a field, of a number equal to a number of poles, by the superconductive materials filled in each two bars and both end rings, so that the motor exhibits starting characteristics similar to those in an induction motor using a squirrel cage rotor composed of usual conductors by starting in an atmosphere of room temperature, and the operational characteristics as a very highly efficient synchronous motor by cooling the rotor to a critical temperature or less of the superconductive material after starting a permanent direct current flows through field windings composed of the superconductive materials.

Abstract: A fan for mounting on and use in connection with cooling of components on a PWB comprising a PWB having an aperture therein for receiving a bearing holder with a bearing rotatable within the holder. An annular multipole permanent magnet is secured to the bearing for rotation in the bearing holder. An impeller in the form of radially and outwardly extending vanes, aligned with a central point but spaced from said point, is secured to an outer surface of the permanent magnet and rotates therewith. A housing is secured to the PWB, the housing being disposed over the impeller and the magnet and having two openings, one in the region above the central point of the vanes and a second opening facing along the surface of the PWB. Four electromagnets are secured to the side of the PWB opposite the magnet, the electromagnets being positioned at the four corners of a square and beneath the magnet.

Abstract: A winding for a rotor in a pulse power AC generator has an electrical conductor extending along a closed loop path about an exterior periphery and first and second opposite ends of the rotor core. The conductor includes at least four side conductor portions having first and second opposite ends, and at least four end conductor portions interconnecting the side conductor portions to complete the closed loop path. The side conductor portions extend generally parallel to one another along generally linear portions of the closed loop path and are disposed along and angularly displaced generally ninety electrical degrees from one another about the rotor core exterior periphery. A first pair of the end conductor portions are disposed at the first opposite ends of the side conductor portions along the first end of the rotor core and interconnect respective adjacent pairs of the side conductor portions.

Abstract: Disclosed is a speech recognition apparatus comprising: a speech analysis portion for extracting parameters necessary for determination of spoken words; a speech period detecting portion for extracting one or more combinations of speech periods using the parameters; and a structure analysis portion for detecting feature points indicative of phoneme structure of each word and for determining a word through computation of similarity to proposed words in accordance with the presence and absence of the feature points. Therefore, erroneous recognition due to noise introduction or the like can be reduced by detecting one or more combinations of proposed speech periods by the speech period detecting portion. By extracting only necessary number of extracting points, which contribute to the distinguishment between words, with reference to analysis procedure provided for each word, the sharpness of determination is bettered.

Abstract: A power supply for a Xenon lamp of a projection television includes a pulse-width-modulator that is included in a power regulating outer feedback loop and in a current-mode inner feedback loop. A current sensing transformer, responsive to a current in a chopper arrangement of the power supply, generates a signal that is coupled to a lowpass filter. The filter generates a ramping portion of each pulse of a control signal that is coupled to a current sensing terminal of the pulse-width-modulator. A switch operating synchronously with a horizontal sync signal is coupled across a capacitor of the lowpass filter to completely discharge the capacitor prior to the beginning of each ramping portion.

Abstract: A permanent magnet, alternating current motor having a variable hysteresis output coupling has an annular permanent magnet rotor caused to rotate within a stator structure. This permanent magnet rotor is capable of being shifted laterally to engage or disengage a hysteresis drag cup output device. With this arrangement either an off-on output torque can be provided, or the output torque can be modulated.

Abstract: A motor structure and energization scheme provides a high efficiency electronically commutated reluctance motor that is characterized by less iron losses than conventional switched reluctance motors. Preferably, the motor operates without the reversal of the flow of flux in the member of the motor supporting the motor windings (e.g., the stator). Also, the flux switching frequency in the first member is reduced and preferably minimized. By eliminating flux reversals and minimizing the flux switching frequency, the electronically commutated reluctance motor is operable over a wide range of speeds with improved efficiency. Structurally, first and second members of the motor are mounted for relative movement. The first member includes unevenly spaced poles, whereas the second member includes evenly spaced poles. The poles of the first member are grouped into pairs separated by a space related to the even spacing of the poles on the second member.

Abstract: A dc converter for supplying an electronic device in which a feed voltage is summed with an additional voltage generated by rectification and wherein pulse-width control is provided at the primary side of the converter transformer. According to the invention, the additional voltage is generated by rectification in the same manner as the main output voltage is generated, i.e. the rectifier circuit outputting the additional voltage is similar to that outputting the output voltage.

Abstract: A fluid draining system for an electric power generator of the type containing a cooling gas under pressure includes oil-pressurized shaft seals adjacent the rotor bearings, to prevent the pressurized gas from escaping through the bearings. Oil is at a pressure higher than the pressurized gas and means are provided to automatically drain leakage oil from the bottom of the generator. The automatic drain includes a differential pressure valve with its first inlet connected to the drain in the bottom of the generator, its second inlet connected to the gas pressure within the generator, and its outlet completing the drain path for the system when the differential pressure of the first inlet exceeds that of the second inlet by a preset amount.

Abstract: A converter circuit includes three-phase unit converters connected in cascade in two stages for supplying electric power to a load. In a region in which the converter output voltage ratio is small, the firing phases of both converters are so set that a phase difference of 120.degree. makes appearance therebetween, while in a region in which the converter output voltage ratio is large, the firing phases are so set as to have a phase difference of 60.degree. therebetween, whereby an angular difference of 90.degree. to 30.degree. is caused to occur constantly between the phases of voltage ripple components of the unit converters. Power factor of a power supply source is improved while ripple in the output voltage of the converter circuit is reduced.

Abstract: A collectorless DC motor with a horizontal air gap, particularly a low-speed motor for a direct drive of recording and/or reproducing devices has its rotor axle supported within an axial bore of the motor housing, with the motor housing made of plastic. A tachogenerator is disposed about the inner cylinder formed by the rotating permanent magnet ring of the motor. The stator winding and the magnetic return structure are fixedly arranged on the motor housing, which is also provided with bores for attaching the motor or installing it into the device. Obviating of machining sequences, simplification of assembly and direct support of the rotor axle in the motor housing all contribute to a reduction in manufacturing cost.

Abstract: In a current source power converting apparatus, in which an AC to DC converter is coupled to a DC to AC inverter through a DC reactor, two energy absorbing devices are coupled to DC terminals of the converter and the inverter, respectively, whereby there is formed a circulation circuit for circulating a current through the two energy absorbing devices and the DC reactor, when a voltage, which is higher than a predetermined value, is induced by an inductance of the DC reactor.

Abstract: An alternating current generator for supplying the electrical loads on a motor vehicle. The generator has a stator core that carries a three-phase stator or output winding. The rotor of the generator has two claw pole members that are so oriented that the fingers of the pole members are aligned. Disposed between the two pole members is a third pole member having projections disposed between the aligned fingers of the claw pole members. The rotor has two field coils which are so arranged and energized that the magnetic polarity of the two claw pole members is the same and opposite the magnetic polarity of the third pole member. One of the field coils can be replaced by a permanent magnet and when this is done the generator is provided with a magnetic circuit that can divert permanent magnet flux away from the stator core. Flux diversion is controlled by supplying unidirectional current to the field winding under the control of a voltage regulator.

Abstract: An electromagnetic actuator having a sensor for sensing an amount of applied force is provided. The actuator maintains an adjustable force by adjusting a current in its coils. the actuator includes an armature and a stator. The stator has a U-shaped back iron, which has a first end portion with a first coil and which has a second end portion with a second coil. The coils form a magnetic flux path from the armature through the back iron and back to the armature. There is a flux density between the armature and each polar enlargement of the back iron. A first sensor unit is mounted on the first pole face, and a second sensor unit is mounted on the second pole face of the back iron, for sensing the flux densities. The first sensor includes a first Hall generator subassembly having a first input for receiving a reference voltage and having a first output for providing an output voltage.

Abstract: A circuit for limiting the transient overvoltage across a power transistor connected in series with an inductive load between a supply rail and a ground rail of the circuit and operated to switch ON-OFF the inductive load utilizes a comparator circuit for switching-ON again the power transistor in order to discharge the energy stored in the load's inductance. The voltage across the power transistor is sensed by a first voltage divider, while a reference voltage is obtained by a second voltage divider connected between the supply and ground. The circuit is practically insensitive to temperature and to variations of the supply voltage and is easily implemented.

Abstract: A voltage drop generator having a current source having reduced sensitivity to transistor base-emitter voltage process and temperature induced variations, is used to generate a precise voltage drop across a resistor. Transistor emitter area ratios are selected and an additional resistance is used in conjunction with the selected ratios to reduce the sensitivity (of the output voltage drop) to base-emitter voltages, to provide substantial improvement in process and temperature dependent output variations.

Abstract: An electromagnetic submerged pump has an outer cylindrical stator with an inner cylindrical conductive core for the submerged pumping of sodium in the cylindrical interstitial volume defined between the stator and core. The cylindrical interstitial volume is typically vertically oriented, and defines an inlet at the bottom and an outlet at the top. The outer stator generates upwardly conveyed toroidal magnetic fields, which fields convey preferably from the bottom of the pump to the top of the pump liquid sodium in the cold leg of a sodium cooled nuclear reactor. The outer cylindrical stator has a vertically disposed duct surrounded by alternately stacked layers of coil units and laminates.

Abstract: Collectorless (brushless) three-phase DC motor having a permanent-magnet arrangement and a three-phase winding, these being movable relative to each other, and having three position sensors which are stationary relative to the winding and controlled by the permanent-magnet arrangement to supply sensor output signals. The winding's coils are energized by current in a cyclical sequence in dependence upon the sensor output signals, the latter being offset by 120.degree.-el. one from the next. Induced coil voltages are offset by 120.degree.-el.; the coil voltages, in crossing zero, are alternately positive for at most 180.degree.-el. and negative for at most 180.degree.-el. and their sum is equal to zero for all relative positions as between the magnet arrangement and the winding. The position sensors are so arranged relative to the winding's coils that the sensors' changes-of-state substantially coincide with the zero-crossovers of the associated induced coil voltages.

Abstract: A high speed method for formant extraction includes the steps of calculating linear prediction coefficients by executing linear prediction analysis of an input speech signal, extracting a coarse formant frequency by making a linear combination of multiple regression coefficients obtained through multiple regression analysis executed with speech feature parameters taken as predictor variables and with formant frequencies taken as criterion variables and speech feature parameters, and solving a root of an inverse filter formed of the linear prediction coefficients by an approximation method in which the coarse formant frequency is set up as an initial value of the root of the inverse filter and an approximation of root is recursively calculated until it converges to the root.