Abstract: A battery charger for simultaneously slow charging and thereafter maintaining a charge in a plurality of plate-type batteries includes a first transformer connected through a circuit loop to a first battery wherein the circuit loop includes a rectifier, and a current limiter and visual indicator of the charge level of the battery. A second transformer is connected through another circuit loop to one battery and through a third circuit loop to a second battery. The circuit loop of the first transformer may be connected to a first battery with one of the circuit loops of the second transformer being connected to a second battery connected in series to the first battery thus allowing the two loops to remain isolated from each other and allow for charging of the series connected batteries without removal of the series connection. In a second embodiment of the invention, a switch is connected in the loop to bypass the current limiter to allow a fast charge condition.
Abstract: A wheeled cabinet contains two internal booster batteries. Jumper cables are connectible to the booster batteries by a plug-and-socket connector. With the plug disconnected from the socket, end clamps of the jumper cables are applied across a battery or batteries of a vehicle to be jump started. Display lamps are actuated to indicate whether or not the polarity of the jumper cables as connected to the vehicle battery or batteries is correct and whether or not the connection points are appropriate for the potential (12 volt or 24 volt) which should be applied. When it is determined that the connection of the jumper cables to the vehicle batteries is correct, the plug is inserted into the socket to connect the booster batteries to the vehicle battery or batteries and permit jump-starting of the vehicle.
Abstract: A compensation circuit for electrical generators is disclosed. In an electrical generator, the electrical current generated in the armature coil induces a magnetic flux in the flux path of the generator. The compensating circuit of the invention includes a conductor that surrounds a portion of the flux path of the generator. This conductor known as the compensating coil, is supplied with a compensating circuit which has a reactive component. The compensating current induces a secondary magnetic flux that has a component that opposes the flux induced by the armature current. In a further embodiment of the invention, a twin generator--generator or twin generator--motor is employed. The compensating coil surrounds the flux path of one of the generators and the other generator or motor is used to supply compensating current to the compensating coil.
Abstract: A rechargeable emergency portable battery charger for starter motor storage batteries. The device includes a sealed lead acid battery as a source of energy. An oscillator circuit connected to a transformer generates 3 V in its secondary. This voltage is rectified and added in series to the 12 V of the self-contained battery to provide charging current to a starter motor storage battery. Connection is made via a cigarette lighter socket in the disabled vehicle. Current is limited to approximately 4 amps so as to limit heat dissipation to a safe level. Furthermore, a voltage-sensing circuit determines if the voltage of the starter storage battery is below approximately 6 V or is shorted to ground. In either case, output current is further limited to the point of cut-off. Recharging the self-contained battery is made possible by a switch that connects the cigarette lighter of a running car directly to the self-contained battery of the charger.
Abstract: An article having an electric motor which is powered by a battery which is capable of being recharged and which is connected and disconnected to the electric motor by movement of the battery between an operating position and a recharging position. The battery is housed within a casing which is movably supported within the article within which the electric motor is mounted and which article may take the form of a vehicular toy.
Abstract: A circuit providing a constant voltage power source for a remotely controlled electrically operated device. The circuit includes a main battery operatively connected with a motor. The secondary battery is connected in parallel with the main battery and operatively connected with a wireless receiver. The negative terminals of both batteries are connected with the receiver through a double-pole single-throw switch and a series connected diode and inductor are interposed between the positive terminals of the batteries so that the secondary battery is charged by the potential of the main battery each time the switch is closed and current flow from the secondary battery to the main battery is prevented by the reverse bias of the diode.
Abstract: A variable electrical energy stabilizer is supplied with a source having a voltage magnitude that varies to maintain a constant ratio with the pulsation frequency of the source. The variable supply is derived from a variable energy source such as a kinetic energy accumulator which is intended for feeding a telephone exchange or an electrical unit on a sealed off site. The stabilizer supplies a d.c. output current to a load having a predetermined impedance. To provide the load with continuous energy with a constant amplitude via solely passive components, the stabilizer comprises an inductive circuit having an inductance substantially equal to the quotient of the constant ratio to the amplitude of the output current. The inductance circuit has a very high impedance compared to the load impedance.
Abstract: A coiled tubular electric battery is a conductor through its electrolyte and it may coincide with an electromagnet and a wire coil. The electromagnet is powered by the battery and caused to pulsate whereby its fluctuating magnet is equivalent to relative motion between the coils and the magnet. Current is increased by ampere turns in the wire induction coil while voltage is increased by series connection of the battery cells.
Abstract: A compact minirelay having a coil, armature and springs housed in a molded housing. Electrical connections for the relay extend through side walls of the housing along the interface between plate parts or between side walls and plate parts. The connections are seated in recesses at the interface and are interlocked with the housing parts which are then bonded together. A snap-on cover is provided.
Abstract: A normally open polarity sensing circuit is interposed between the charging current output of a battery charger and battery terminal clamps connected with a rechargeable storage battery. Normally open reed switches, closed by battery positive terminal potential, gates silicon controlled recitifiers for battery charging current flow according to the polarity of the battery.
Abstract: Pole piece structures for permanent magnets and electromagnets, more particularly for superconducting electromagnets, and pole piece extensions and shields adapted, separately and in combination, to achieve a high concentration of the magnetic flux along the principal magnetic axis of the pole pieces, and preventing magnetic flux leakage and dispersion. The pole pieces are preferably conical or frusto-conical, or in the form of hollow cylinders or conical cylinders or, alternatively, provided with a tapered step ending in a pointed cylinder, a flat cylinder, or a hollow cylinder. The pole piece configurations provide a high concentration of magnetic flux intensity in the magnetic gap between the pole pieces either along the centerline of the pole pieces or in a cylindrical space disposed axially along the centerline of the pole pieces.
Abstract: The invention relates to an apparatus for supplying high-power electric loads operated in a pulse-like manner, particularly to X-ray equipment.The apparatus makes use of the mechanical energy of rotation of a flywheel rotated through a time period which is substantially longer than the pulse duration of the load by a driving power being substantially smaller than the pulse power of the load to generate a supply voltage for the load in expense of this mechanical energy. The driving period of the flywheel and the associated moderate driving power provide an energy balance with the short pulses with high power consumption. The apparatus comprises a generator unit with at least one electric rotary machine which has a rotor that rotates together with the flywheel. The excitation of the rotary machine is provided by a field power supply being controlled by a control unit. The control unit controls the excitation of the generator unit to provide predetermined output voltage and current levels for the load.
Abstract: A slip ring less, three-phase, AC generator especially for motor vehicles, in which the compound winding is subdivided into individual components which are directly interconnected within the branches of the rectifier bridge supplying direct current for the on-board electrical system so that the voltage drop across the compound winding is sensed and compensated by the regulator. The compound winding can be wound of wire having a small diameter.
Abstract: A battery charge system for a transfer magnet (heretofore generally known as a lift magnet) and for a chuck control. In the case of the transfer magnet, the battery provides constant power, while in the case of the chuck control, it serves as a standby power. The charge system is automatically connected when the charge on the battery reaches a predetermined minimum, and disconnected when it is charged to a predetermined maximum. The battery in each case is connected with the usual utility source of AC, and upon the voltage of the battery reaching the levels mentioned, the AC source is respectively connected or disconnected.
Abstract: A rechargeable battery is supplied with a charging voltage from a charging voltage source and exhibits a charging voltage characteristic having a peak shortly before the rechargeable battery reaches a fully charged state. A resistor voltage dividing circuit having a plurality of voltage output terminals is connected to both terminals of the rechargeable battery. A voltage memory device is provided for storing a predetermined voltage based on a voltage supplied from the voltage dividing circuit corresponding to the peak point of the charging voltage characteristic and comparison is made of the other output voltage obtained from the voltage dividing circuit after the peak point is passed and the stored voltage in the voltage memory device and a supply of a charging power from the charging voltage source to the rechargeable battery is interrupted when the difference between these voltages becomes zero.
Abstract: An adaptor (26) for enabling small electrical cells (30) to be charged in a charger (10) designed to mate with and charge large cells. The adaptor has a recess for holding a small cell, is shaped and sized similar to the large cell, and has conductive parts (42, 44, 50, 54, and 52) designed to connect the contacts of the small cell to the terminals (22, 24) of the charger when the adpator is positioned in the charger. The adaptor is cylindrical, has an insulating body portion (36) and conductive, removable top and bottom caps (44 and 42). A hole or channel (48) through the body portion contains a spring (50) and a space to receive the small cell.
Abstract: An array of low wattage low voltage current regulators is used to provide a multiple of regulated constant currents for charging a variable number of rechargeable batteries from a given power source voltage at any of a plurality of settings by changing the current capacity. Visual indications of the current settings are also provided.
Abstract: Desynchronization of a synchronous machine is predicted by detecting a phenomenon of radical variation of the magnetic flux in the gap of a synchronous machine immediately before falling into an asynchronous state. For example, each functional value of the direct axis flux and the quadrature axis flux in the gap is detected for comparing the variation of each functional value with a predetermined reference level to predict desynchronization of the synchronous machine.
February 25, 1980
Date of Patent:
September 21, 1982
Fuji Electric Co. Ltd., Masaki Takahashi
Abstract: A preferably axial air gap motor has coreless armature stator windings and a permanent magnet rotor. Sensors, such as Hall generators, are provided to sense the rotary position of the rotor and control switching of current to the respective armature windings. The stator armature windings have a maximum of two magnetically active coil sections per pole of the multi-polar rotor, preferably arranged as flat round coils located on the stator in diametrically arranged configuration, the angular spacing between imaginary diametrical lines through the coils being, however, non-uniform over the rotor circumference, and matched to the spacing of rotor poles, the larger angular gaps between the coils providing space on the stator for the sensors and electronic circuitry. In a preferred embodiment, the rotor has numbers of poles divisible by eight.