Abstract: There is provided an engine driven arc welder adapted for converting a.c. output of welding generator into d.c. output to allow it to undergo switching control by using a switching circuit to detect an output of the switching circuit to control its ON/OFF period by the detected content to control a welding current. The engine driven arc welder has a load limiting function. In this case, AVR is employed in a feedback control loop for generator voltage. The circuit configuration includes a F/V characteristic circuit and an output suppression circuit for comparing a detected voltage of the welding generator with a predetermined reference voltage to deliver, when the detected voltage is lower than the reference voltage, a signal for suppressing a welding output to a constant current control circuit for controlling welding current so that it becomes equal to a fixed value.

Abstract: A method and system of controlling the output current/voltage characteristic curve of an engine driven alternator welder with a maximum open circuit output voltage, including a rotary engine, a three phase alternator, a rectifier bridge having a number of electronic switching devices for directing current to the output at an operating point determined by the firing angle of the switching devices, a sensor for sensing output current, a sensor for sensing output voltage, and a microprocessor output control device for controlling the firing angles of said switching devices in response to the sensed current and sensed voltage.

Abstract: There is provided an engine driven arc welder adapted for converting a.c. output of welding generator into d.c. output to allow it to undergo switching control by using a switching circuit to detect an output of the switching circuit to control its ON/OFF period by the detected content to control a welding current. This engine driven arc welder further has a reference signal formation circuit for forming a reference signal such that when a detected voltage across welding terminals is higher than a first predetermined value, it has a first reference value.

Abstract: An engine driven welding machine has two paths of cooling air flowing therethrough that are segregated from each other. Both paths have their inlets at the electrical end of the welding machine, and both paths have their exhausts at the machine engine end. The first path directs air through a passage containing a rectifier and into a blower housing. The blower housing divides the first path into a first portion that supplies combustion air to the engine. A second portion of the first path directs air over outer walls of the engine block and head and into a hot air exhaust box, from which the air exhausts from the machine. The second path directs air over a stabilizer and into a generator. From the generator, the second path leads to an engine compartment, from which the air exhausts. The first and second paths direct the cooling air through multiple turns that reduce machine noise.

Abstract: A self-contained welding machine has the same width as a selected prior welding machine and is interchangeably mountable therewith to a flat surface. The welding machine of the invention has a base that utilizes the full space available above its width by fabricating the base with side walls that lie in respective vertical planes coinciding with the vertical planes that pass through the outermost ends of mounting lugs on the base of the prior welding machine. Mounting holes in the floor of the base are accessible through associated openings in the base side walls. Covers cooperate with the base floor and side walls to create pockets that close the side wall openings while providing access to the mounting holes in the base floor.

Abstract: At end cap construction forms part of an enclosure for a self-contained welding machine. The end cap construction comprises a control panel assembled to the back plane of an upright bezel. Triangular-shaped arms on the bezel fit into a corresponding triangular-shaped outline of the panel to add rigidity to the panel. The bezel has appreciable thickness between its back plane and a front plane. Control knobs on the control panel front surface are recessed from the bezel front plane and are thus protected by the bezel against damage. The bezel and panel have respective flanges that are fastened to top and side covers that complete the enclosure.

Abstract: A battery box for an engine driven welding machine slides in an opening in the welding machine base between closed and open positions. When the battery box is in the closed position, a battery secured to a battery box is concealed inside the base. When the battery box is in the open position, the battery is exposed for servicing. Panels assembled to the base define an opening in the base. The panels cooperate with the base floor to form slots in which the battery box slides. The panels and base floor provide a cantilever support for the battery box when it is in the open position. A finger hole in the battery box is surrounded on one side by a small housing that keeps foreign material out of the machine base when the battery box is in the closed position.

Abstract: An idle solenoid assembly sets the idle speed of the internal combustion engine of a self-contained welding machine. The idle solenoid assembly comprises a bracket to which a solenoid is immovably secured. The solenoid plunger is connected to the engine governor arm. The bracket has slotted feet that slide on an engine surface. By sliding the bracket, the position of the engine governor arm is adjusted to produce the desired engine idle speed when the solenoid is actuated. There is no contact or binding between the bracket and the solenoid plunger or between the solenoid plunger and the engine governor arm. The solenoid is wired to a control circuit through a first plug retained in the bracket and a second plug. The solenoid is properly grounded on the internal combustion engine through the second plug.

Abstract: An engine-driven, multiple-phase, alternator-powered SCR rectified arc welding power supply using a single synchronizing winding within the alternator providing signals to a synchronizing digitizer which masks noise for most of each cycle of the alternator. The synchronizing circuitry prevents spurious synchronizing signals.

Abstract: A welding power supply having a multiphase alternator and a thyristor rectifier using a control circuit to selectively prevent firing of thyristors when a short circuit occurs. Reliable operation of an alternator welding power supply under short circuit conditions is achieved.

Abstract: A d-c arc welding apparatus including an engine-driven welder converting the a-c power generated by an engine-driven alternator into d-c power for use as the drive power of the welder, a battery-driven welder using a battery as the drive power of the welder, and a changeover switch for selecting between a high-power mode in which the above-mentioned welding d-c outputs are connected in parallel and fed to the welding apparatus, and a low-power mode in which either of the above-mentioned welding d-c outputs is supplied independently to the welding apparatus.

Abstract: In an engine welder of the type including an output alternator having a rotor driven about a central axis with an outwardly facing, cylindrical surface and a stator with a cylindrical surface generally matching said cylindrical surface of the rotor and containing in a number of inwardly opening, circumferentially spaced, axially extending winding slots, wherein the slots include a first group adapted to receive welding current windings and a second group adapted to receive auxiliary power circuit windings. The improvement in this construction involves modifying the first group of slots to include structural means for causing a substantial increase in the flux leakage in the first group of slots, as compared to the flux leakage between the second group of slots. In this manner, the welding output of the engine welder has a substantial internal reactance and the auxiliary power circuit has a reduced internal reactance, all in the same stator.

Abstract: An output circuit for a portable generator having a plurality of output windings provided separately from each other, and control winding provided separately from the output windings. A plurality of thyristor bridge circuits each having thyristors are connected respectively to the output windings. A superposing circuit superposes outputs from the thyristor bridge circuits one upon another to provide a first superposed output voltage. A rectifier circuit is connected to the control winding. The rectifier circuit is disposed such that its output voltage is superposed upon the first superposed output voltage to provide a second superposed output voltage. A control circuit is responsive to the second superposed output voltage for concurrently controlling voltages applied respectively to the gates of the thyristors of the thyristor bridge circuits to thereby maintain the first superposed output voltage at a constant value.

Abstract: A separately power-feeding welding generator having at least two main generating windings for supplying power to loads by rectifying an induced voltage and adapted to permit the power being fed from the two main generating windings to the loads to be separately controlled, in whicha thyristor is provided in a rectifying circuit for rectifying a voltage induced in at least one of the two main generating windings;an a-c voltage detector for detecting the voltage induced in at least one of the two main generating windings anda thyristor control signal generator for controlling the conduction angle of the thyristor on the basis of the detected signal of the a-c voltage detector and the reference level obtained by extracting the level of the current being fed to the loads are provided;a diode which conducts when a positive half-wave is applied in parallel with the thyristor is connected in series with a resistor element;a first control power supply for rectifying a voltage induced in at least one of the two main g

Abstract: A dynamo in the form of a 3 phase welding generator. One stator winding has an in-phase excitation winding feeding the rotor through slip rings. This configuration allows for inherent short-circuit protection as the stator core under short-circuit saturates and prevents rotor excitation, a shaft-mounted fan cools inner and outer surfaces of a tubular heat sink that surrounds the generator and holds a diode-resistor bank.

Abstract: A portable electric power source for movable welding equipment used for constructing storage tanks and the like comprises a platform; an engine mounted on the platform; an AC electric generator mounted on the platform and driven by the engine; a welding machine, mounted on the platform, including electric current inverter and transformer means by which AC electric current from the generator is converted to DC welding current; and current transmission means for conveying the welding current from the welding machine to the welding head of the associated welding equipment. The welding equipment and the power source are mounted on carriages which are coupled together so as to move in unison as the welding operation progresses.

Abstract: A welding system is disclosed having an alternator which includes two overlapping delta configuration three-phase stator windings of differing gauge. An ordinary welding rod may be utilized or, a supply or consumable welding wire may be coupled to the output of the alternator and advanced by means of a wire feeder in response to the actuation of a trigger control. A control circuit is then utilized to selectively activate a rotatable electric field winding within the alternator in response to the actuation of the trigger control such that the welding wire is "hot" only during actual welding operations.

Abstract: An electrical power supply used on a motor vehicle is interconnected with the vehicle battery, alternator and regulator. The power supply includes a voltage multiplier for multiplying the rectified output voltage from the alternator, and welding sockets for facilitating a welding operation. A multi-pole switch exclusively selects the operating mode of the power supply from among normal battery charging, power appliance operation and welding.

Abstract: A system for providing a regulated low voltage DC source and a regulated higher voltage AC source at a preselected frequency, such as 60 Hz. from the same windings of an alternator rotated at variable speeds including a phase WYE connected engine driven alternator providing three output posts and a neutral post and having a field circuit, a half-wave rectifier connected to each of the output posts of the alternator providing a low voltage DC source, a cycloconverter having a three phase input connected to the posts of the alternator and providing a single phase output at the preselected frequency, a resonating transformer having the primary connected to the output of the cycloconverter and having a capacitor in the secondary providing a resonant frequency at the desired AC frequency, such as 60 Hz., and a clock circuit providing an AC control voltage at a preselected frequency, such as 60 Hz.

Abstract: A regulated chopped DC power supply comprising an alternator with a stator and a rotor, the alternator having a three-phase winding for providing a high voltage output (1, 2, 3) and a star-connected three-phase winding for providing a low voltage output. Also included is a control circuit (14) for controlling a rectifier (12) which is connected to the high voltage output (1, 2, 3) of the alternator to produce a regulated chopped dc output (52) for powering electrical appliances. The control circuit (14) periodically interrupts the rectifier (12) at a frequency to interrupt substantially simultaneously all of the phases of the high voltage output.

Abstract: An arc welder, designed to receive its source of power from a vehicle's alternator through a special controlled battery charger. The first portion of energy used in welding comes from the vehicle's battery charger and the balance of energy used in welding comes from the welder's battery pack. Between spurts of actual welding, the welder's batteries are re-charged by the vehicle's special controlled battery charger. The batteries in said battery pack are so arranged as to give the operator a choice of voltage for welding and inductors are used to control the current. Also, the batteries can be used direct by by-passing said inductors for extra-heavy cutting and/or extra-heavy duty welding thus giving the operator an extremely wide range of current to fit his needs.

Abstract: A D.C. welder includes an engine-driven D.C. generator, a polarity-revers switch which can change the direction of current flow through the field winding of that generator to provide a positive or negative polarity at the welder output terminals, a circuit that automatically permits only uni-directional current flow through that field winding during the starting of the engine, and a further circuit that energizes a solenoid to close contacts which enable that generator to operate as the starting motor for that engine but which thereafter de-energizes that solenoid and then keeps it de-energized until the engine is at, or close to, rest.

Abstract: An automatic feedback and control system for operating a load off of a multi-phase rectified rotary field system of a motor vehicle and for increasing the voltage and current to the load upon demand. The multi-phase rectified rotary field system comprises a rotatable coil for forming the rotary field when excited and stationary windings having an output coupled thereto by way of rectifier means. A DC power supply is coupled to said output. A regulator is provided having an input coupled to the DC power supply and and output coupled to the rotatable coil. Non-polarized capacitors are provided and a switch is coupled to the capacitors and to the DC power supply. The switch when closed, electrically connects the capacitors between the stationary windings and the rotatable coil and electrically connects the DC power supply to the rotatable coil.

Abstract: A system adapted to be coupled to the alternator-rectifier system of a motor vehicle including a feedback capacitor coupled from the stator windings to the rotary coil for applying a pulsating DC output to the rotary coil when a welding load is applied to the output of the alternator-rectifier system. A DC power supply is employed normally to excite the rotary coil during no-load conditions.

Abstract: A solid state control circuit is connected to the output of an engine or motor driven alternator to provide a direct current output primarily for welding purposes. The control circuit includes gate controlled thyristors (SCRs) which are gated on at precise times within each cycle in order to provide an output having desired characteristics, such as constant current or constant voltage. Synchronizing windings associated with the alternator provide signals used to control the time of gating for the SCRs. Circuit means are included to insure that the control signals will be unaffected by any disturbances generated within the synchronizing signals due to the operation of the SCRs, and one such means includes an amplifier having a feedback circuit providing a hysteresis greater than any voltage change in the synchronizing signal caused by the operation of the SCRs.

Abstract: In a device for starting an AC load powered by an AC generator and designed so that, prior to starting the load, the magnetic circuit of the generator is saturated to prevent an abrupt large drop of terminal voltage thereof when starting the load, and that in this state the load is started. A starting device comprising a coil for saturating the magnetic circuit of the generator and a starter coil both of which are wound in a same direction around a common closed magnetic path to couple these two coils magnetically, and operative so that, after saturating the magnetic circuit of the generator by the saturating coil, the connections of the two coils are switched over to start the load, and that by the reverse voltage induced in the starter coil by the energized saturating coil, the surge current which is produced, when the load is started, at the time of switching the coil connections is suppressed.

Abstract: A D.C. welder includes an engine-driven D.C. generator, a polarity-reversing switch which can change the direction of current flow through the field winding of that generator to provide a positive or negative polarity at the welder output terminals, a circuit that automatically permits only uni-directional current flow through that field winding during the starting of the engine, and a further circuit that energizes a solenoid to close contacts which enable that generator to operate as the starting motor for that engine but which thereafter de-energizes that solenoid and then keeps it de-energized until the engine is at, or close to, rest.

Abstract: A brushless welding generator with a homopolar machine which supplies welding current, and has winding-free rotors with several pole rings. Each of these form an air gap of varying size around its periphery with the stator. The homopolar machine is divided into two electromagnetic parts, each having an exciting winding. The exciting field is controlled in one of the two electromagnetic parts in opposition to the welding current. One electromagnetic part, furthermore, has a further exciting winding fed by the welding current to control its exciting field. This further exciting winding produces an exciting field directed opposite to the exciting field of the first-mentioned exciting winding. A regulator controls the welding current of one exciting winding, and a signal derived from the welding current is applied to the regulator for representing an actual value.

Abstract: The controller automatically and remotely controls the stopping and running of an internal combustion engine coupled to a DC generator that supplies DC power to the welding cables of an arc welding machine. The engine has a starter, an ignition, and an intake manifold. A vacuum-actuated switching means is coupled to the intake manifold and is responsive to the vacuum produced therein. A switching circuit is coupled to and is controlled by the vacuum-actuated switching means. A starter and an ignition are coupled to the switching circuit. A timer having a predetermined timing interval is coupled to the switching circuit, to the welding circuit, and to the ignition.

Abstract: An excitation control circuit for a brushless synchronous welding generator, in which the stator-mounted excitation winding is fed from a separate voltage source via two parallel-connected power transistors with independently adjustable base circuits, one transistor controlling the excitation current in the idling mode, the other in the welding mode. A change-over switch, responding to an electromagnet in the welding current circuit, alternatingly energizes one transistor, while blocking the other.

Abstract: An apparatus and a method for controlling the exciter current in a welding generator such that the open circuit voltage of the generator is regulated within suitable limits prior to arc start. A voltage controlled relay is connected to the generator's output and controls the inclusion of a voltage regulated biasing circuit in the base circuit of a transistor connected in series in the exciter circuit to assure that when the voltage exceeds a preset level of the voltage controlled relay, the exciter current will remain substantially constant.

Abstract: The controller automatically and remotely controls the stopping and running of an internal combustion engine coupled to a DC generator that supplies DC power to the welding cables of an arc welding machine. The engine has a starter, an ignition, and an intake manifold. A vacuum-actuated switching means is coupled to the intake manifold and is responsive to the vacuum produced therein. A switching circuit is coupled to and is controlled by the vacuum-actuated switching means. A starter and an ignition are coupled to the switching circuit. A timer having a predetermined timing interval is coupled to the switching circuit, to the welding circuit, and to the ignition.