Abstract: A core for a dynamoelectric machine has a pair of generally opposite end faces, and wall means is provided in the core for defining at least one winding receiving slot intersecting the opposite end faces, respectively. At least a pair of layers of generally thin dielectric material are associated in overlaying relation and disposed in the slot. A set of apertures are arranged in a preselected pattern in the layers and disposed in non-aligning relation, and a set of non-apertured sections in the layers are arranged in the layer between the apertures, respectively. At least some of the apertures in each layer are communicated with at least some of the non-aperture sections in an adjacent layer, and the at least some apertures in one of the layers is also communicated with the wall means of the at least one slot.A method of assembling a core, a method of treating a core, and a method of assembling a slot liner are also disclosed.
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: 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: In an exemplary embodiment, a battery conditioning system monitors battery conditioning and includes a memory for storing data based thereon; for example, data may be stored representative of available battery capacity as measured during a deep discharge cycle. With a microprocessor monitoring battery operation of a portable unit, a measure of remaining battery capacity can be calculated and displayed. Where the microprocessor and battery conditioning system memory are permanently secured to the battery so as to receive operating power therefrom during storage and handling, the performance of a given battery in actual use can be accurately judged since the battery system can itself maintain a count of accumulated hours of use and other relevant parameters. In the case of a nonportable conditioning system, two-way communication may be established with a memory associated with the portable unit so that the portable unit can transmit to the conditioning system information concerning battery parameters (e.g.
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: A method and apparatus for the automatic connection of battery cables to eliminate spark or other undesirable effects from misconnection includes apparatus for sensing the polarity of the batteries to which the cables are attached and for automatically switching the connection cables so that the polarities are matched. Other portions of the circuit inhibit charging if one of the clamps becomes disconnected from a battery post or if a battery is below a predetermined small voltage indicating either an unchargeable battery or a disconnected cable condition. A specialized battery cable clamp is provided in which one set of jaws is insulated from the other, with a standoff preventing the jaws from touching each other. Once predetermined conditions have been met and the sense of the terminals on each of the batteries has been periodically ascertained, the main switching relays are activated so as to connect the appropriate main battery cables from one battery to another.
Abstract: The recording surface of an optical record carrier (1) is divided into a succession of first (A) and second (B) annular zones, each including a plurality of substantially concentric information tracks. The tracks in each zone (A) include radially aligned first control words (13) and the tracks in the annular zones (B) include radially aligned second control words (14), the structures of the first and second control words being distinguishable from each other. An optical scanning device projects a beam which as it scans the tracks reads the control words and a detection circuit generates a measurement signal V.sub.m upon each passage of the beam from one zone to another. The measurement signal can be utilized to rapidly address the scanning beam to any of the annular zones.
Abstract: A standard, predetermined phase sequence of the three-phase voltage output of an electrical power generator, as produced through conventional main leads in the generator lead box which interconnect three (3) generally, axially aligned pairs of connectors of first and second sets, is selectively reversible by the utilization of crossed main leads between two adjacent pairs of the connectors of the first and second sets. Each of the crossed main leads includes opposite end portions aligned with the diagonally-related and interconnected pair of connectors of the first and second sets, the end portions having corresponding bends therein for smoothly contouring and integrally joining the central portions thereof, and the central portions have complementary outward bends in at least the mutual crossing portions thereof to maintain a predetermined, minimum distance therebetween so as to satisfy voltage strike requirements.
September 2, 1988
Date of Patent:
September 12, 1989
Westinghouse Electric Corp.
Benjamin T. Humphries, Aleksandar Prole
Abstract: A fan assembly that includes an impeller driven by an electric motor. The housing for the impeller has an air intake opening and a pressure-side connection for the discharge of air, with the pressure-side connection being provided with an air inlet opening that communicates with an air conduit that in turn leads to the electric motor housing. Air that flows through the air conduit is supplied at least to the region of the commutator of the electric motor. The electric motor housing is provided with an air outlet opening for receiving air that has been supplied to the electric motor housing via the air conduit, with this air outlet opening being in flow communication with an underpressure region of the impeller remote from the pressure-side connection of the impeller housing.
Abstract: The converter is designed to provide very great isolation between its input (AB) and its output (MN) in order to prevent disturbances in the input signal effecting the output signal.At the beginning of each cycle T as defined by a clock circuit (7), a switch (9) allows energy to be transmitted from the input (AB) to the output (MN) for a period of time t1 which is less than T. This period t1 is determined by a comparator (6) which receives a signal representative of the energy received by the input (AB) since the beginning of the cycle from a measuring circuit (1-5).Particularly applicable to protection against interference.
Abstract: An in-axle wheel speed sensor exciter rotor assembly (100) for sensing the rotational speeds of a drive axle ring gear (14/30) and a drive axle differential side gear (48) is provided. The assembly includes a tubular member (102) having teeth (110) for engagement with slots (112) provided on the side gear hub (48a) and carrying a first exciter rotor (116) at the opposite end (114) thereof. A second exciter rotor (118) is axially retained on the tubular member axially adjacent the first exciter rotor and is rotatable relative thereto. The second exciter rotor carries a coupling device (124/128) for engagement with threaded bores (126) provided in the drive axle ring gear/carrier assembly to rotationally couple the second exciter rotor to the ring gear and to axially retain the assembly (100) within the drive axle.
August 25, 1988
Date of Patent:
August 29, 1989
Joseph B. Dierker, Jr., Glen D. Peterson, Thomas A. Gee
Abstract: A torque coupling device of the synchronous reluctance type having a magnetic flux generating device and concentric rotors, each rotor having a sleeve of diamagnetic material including a plurality of flux windows, the diamagnetic sleeves on the two rotors cooperating to provide a reluctance gradient within a magnetic circuit, thereby variably magnetically linking the two rotors.
Abstract: Disclosed are various circuits which assure safe connection of battery chargers or other electrical apparatus, wherever two sets or pairs of terminals are to be connected safely. Additionally, overload protection modules and On-time delay modules prevent overloads from being transmitted to the receiving side and delay the connection to the end terminals. Further, a minimum charger-voltage-detector version prevents use when not safe. Various embodiments of circuit modules, including using a micro processor, are presented in accordance with the invention.
Abstract: Improvement for power supplies include a protection circuit having a first L-C filter network, a second L-C filter network and a voltage clamping device such as a zener diode which is disposed between the two L-C filter networks. The protection circuit reduces the magnitude of overvoltage input transients which might otherwise damage the internal components of the inverter. For generating very high output votlages, the power supply includes a high voltage transformer and a Crockoft-Walton voltage multiplier coupled thereto. The high voltage transformer is coupled to an inverter through a coupling circuit which includes a capacitor in one leg of the primary winding and a parallel connected resistor/inductor in the other leg of the primary winding of the high voltage transformer. The high voltage transformer is formed of a multi-sectioned bobbin which is defined around an axially extending core.
Abstract: A non-isolated battery charger for direct connection to an AC source provides rectified DC current to the battery being charged. A thermostat in a heat conducting relationship with the battery senses battery temperature and discontinues the charging current when the temperature of the battery rises after attaining full charge. In one form of the invention, a trickle charge path is provided to the battery to maintain its charge state after the full charge has been attained. The trickle charge path is provided by an impedance shunting the thermostat and is operative as a current path when the thermostat is in its open condition. The trickle charge path can be a resistor where the thermostat is in the DC part of the charger circuit or a capacitor where the thermostat is in the AC part of the charge circuit.
October 22, 1987
Date of Patent:
August 1, 1989
Black & Decker Inc.
Richard T. Walter, Pradeep Bhagwat, George W. Lipa
Abstract: A commutator for an electric machine with reciprocally insulated metal segments is described. At least one groove is made in the segments in the circumferential direction of the commutator and receives an insert formed from a precious metal or electrographite part. The axial width of the inserts only takes up part of the commutator contact surface. Alternatively two inserts are juxtaposed in each segment.
August 12, 1988
Date of Patent:
July 25, 1989
Hubner Elektromaschinen AG
Gunter Doege, Peter Jakob, Ing L. Wilhelmy
Abstract: A brushless generator having a rotor for generating a magnetic field, a stator having magnetic poles facing the rotor a main generating winding; and a voltage is induced as the magnetic field generated in the rotor intersects the main generating winding, in which slots are provided at the locations of the stator magnetic poles facing the rotor, exciting windings are wound on the slots to generate in the exciting windings voltages having different phases with respect to that of the voltage generated in the main generating winding, and brushes are eliminated by using the voltages generated in the exciting windings.
Abstract: A circuit for operation with solar panels exhibiting constant current and variable voltage characteristics. The power output of the panels is maximized by the circuit through the use of a step-down form of regulator which functions to monitor the peak voltage level of the panel and regulate with a switching type regulator in accordance therewith. Thus, peak voltage levels are maintained while current output to the load driven by the panels is enhanced. When employed for battery charging, the circuit includes a threshold selection network which identifies the nominal voltage rating of the battery under charge and provides appropriate adjustments to carry out a pulse charging technique. For start-up conditions wherein battery voltages may be below levels requisite to evaluate nominal rated voltages, a higher level charging voltage is applied for a predetermined short interval until adequate threshold is achieved to make appropriate determinations of rated voltage values.
Abstract: In a system including volatile memory, a battery backed memory may be available for preserving data in the event of a power failure. Low power condition is reliably sensed sufficiently in advance of supply voltage falling below a minimum operating voltage range so as to give an adequate time interval, e.g. 2.5 milliseconds for the saving of application operating system status. By using a voltage regulator signal which switches in a particularly sensitive manner toward a saturation or zero state well outside its normal control range to trigger a low power signal, such low power signal may provide a time interval of, e.g. from three to six milliseconds of advance warning of impending supply voltage failure.
Abstract: A method and apparatus for assembling an information signal on a rotary recording medium comprising a pre-recorded track recorded with pre-recorded information signals and an unrecorded track not recorded with information signals by use of a light beam in which an information signal to be newly recorded on the rotary recording medium is recorded continuously from the pre-recorded information signal already recorded on the pre-recorded track. The apparatus by use of a light beam searches for a pre-recorded track turn which is a portion of the pre-recorded track immediately preceding the unrecorded track and continuously reproduces the information signal from the searched pre-recorded track turn as it waits for a command signal commanding the recording of the information signal to be recorded.