Abstract: A compound motor-generator system including a first motor-generator and a second motor-generator. The first motor generator includes a stator having a set of three-phase field windings and a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator. The second motor-generator includes a rotational stator and a second rotor coupled to a common shaft with the rotor of the first motor-generator and disposed inside and coaxial to the rotational stator. The rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor.

Abstract: Systems and methods for estimating engine and electrical machine health are provided. The systems and methods therefore include features that provide for improved health estimates of one or more engines and/or electrical machines of one or more engines having an electrical machine embedded therein or coupled thereto. In particular, the systems and methods therefore include features for utilizing sensed or measured operating parameters of the electrical machines and/or operating parameters of the prime mover to estimate the health of the prime mover and/or the electrical machines embedded therein or coupled thereto.

Abstract: A brushless synchronous electrical machine with an unwound rotor comprising poles excited through axial air gaps at both ends of the rotor by stationary exciters comprising high permeable cores and electrical winding.

Abstract: Device for operative connection between a subsea step out cabie far end and subsea toads such as pumps, compressors and control systems, distinctive in that the device is a subsea DC provider (SDCP), and it comprises: a SDCP unit for altering alternating current power received from the step out cable to direct current power for delivery to said loads, a gas and/or liquid filled vessel into which said unit is arranged, and the device is a SDCP for subsea location at a far end of a subsea step out cable connected to at least one AC power source at the step out cable near end, and the step out length is long, which means long enough to cause, stability problems at frequency and power levels feasible for subsea pump and compressor motors, and where the device via the step out cable receives input electrical power at a low enough frequency to have stable transmission and the device, operativeSy connected to the subsea motors, delivers a DC output electrical amperage and voltage feasible for operation of connected

Abstract: Systems and methods are provided that include a gas turbine, a generator coupled to the gas turbine and configured to generate a first electrical power output, and a variable frequency transformer coupled to the generator and configured to be coupled to an electrical grid such that the variable frequency transformer is configured to transform the first electrical power output into a second electrical power output having one or more power characteristics that correspond to the electrical grid.

Abstract: A method for operating a photovoltaic system with a plurality of photovoltaic modules and with a DC motor connected to the photovoltaic modules is proposed. The motor shaft of the DC motor is coupled to a generator shaft of a three-phase generator, wherein the three-phase generator can be connected to a power grid. The motor shaft of a second DC motor can also be connected with the generator shaft, and the electric energy produced by the photovoltaic modules is initially only used for driving a single DC motor and is during the subsequent operation divided between those DC motors. A battery is provided which can be connected with the second DC motor instead of the PV system by changing the excitation of the second DC motor such that it's motor voltage corresponds to the open-circuit voltage of the battery.

Abstract: An apparatus and a method for preparing connection of a photovoltaic system (Q1) as a first energy source to a power grid (13) by way of a motor generator set (5, 6, 7) is presented. The DC motor (5) is coupled to a three-phase generator (7) by way of a shaft (6), wherein the three-phase generator (7) can be connected to the power grid (13). It has been observed that connecting this type of apparatus to the small or varying power output of the photovoltaic system (Q1) can be difficult and time-consuming. To enable a clean and quick connection, the DC motor (5) is powered with electric DC current from a second DC current source (Q2), wherein the operation of the three-phase generator (7) is matched to the conditions in the power grid (13) with the help of the second DC current source (Q2), and wherein the photovoltaic system (Q1) is connected to the DC motor (5) and the second DC current source (Q2) is disconnected from the DC motor (5) only after a complete match has been attained.

Abstract: According to the invention, a system for generation of electrical power is provided. The system may include a wind driven element, a primary generator, a clutch, and an assist motor. The wind driven element may be configured to be rotated by wind thereby creating rotational motion, and further to provide the rotational motion. The primary generator may be configured to receive rotational motion, and further convert the rotational motion into electrical power. The clutch may be configured to selectively provide rotational motion from the wind driven element to the primary generator, and further to selectively not provide rotational motion from the wind driven element to the primary generator. The assist motor may be configured to create rotational motion, and further to selectively provide rotational motion to the primary generator independent of the wind driven element.

Abstract: A direct current to alternating current inverter is described herein. In an embodiment of the present subject matter, various direct voltage electrical potentials are applied to rings of a rotor so that each ring of the rotor is a different direct current potential. Preferably, the direct current potentials are applied in a manner so that the potential increases or decreases from a center ring to an outer ring, or vice versa. A stator has brush assembly having a series of brushes. Each brush is physically connected to a ring in such a way that the brush picks up the voltage. As a motor spins the rotor, the voltages picked up by the static brush assembly increase in positive potential, then decrease in positive potential, then increase in negative potential, and then finally decrease in negative potential, generating an alternating current.

Abstract: Modern solar voltaic power conversion for grid compatible usage requires employing complicated active electronic systems designed to control connection, conversion, regulation and safety functions that are absolutely necessary for co-generation applications. This invention inherently and passively performs all of those functions, delivering fully regulated, compatible and fail safe alternating current suitable for supplementing the electrical grid at virtually any point of use and does not use any active electronic devices. This invention dramatically simplifies and improves the art of converting solar voltaic power to common grid power by utilizing an ingenious “Motor-Generator” combination of a common direct current motor and a common induction motor; Two very old devices that have been in common use for over one hundred years.

Abstract: In a device and a method for controlling an electromechanical power converter (10), particularly of an electric motor and/or generator, comparatively cost-effective switches (14, 18) can be used without drastically decreasing the serviceable life of the entire system. A number of controllable switches (14, 18) can be used for controlling the converter (10), and dividing up a switching load, which is caused when connecting e.g. short-circuiting converter connections (21, 22), to a number of switches (14, 18) over the serviceable life.

Abstract: A photovoltaic system having a plurality of photovoltaic modules producing electric energy and method for operating such photovoltaic system are disclosed. With the method, the photovoltaic modules are connected to a first DC motor having a motor shaft, and a generator shaft of a three-phase generator is coupled to the motor shaft. The three-phase generator can be connected to a power grid. The motor shaft of a second DC motor can be connected to the generator shaft, with only one of the two DC motors being initially driven with the electric energy produced by the photovoltaic modules. The electric energy is subsequently divided among both the first and the second DC motor. This process significantly shortens the startup process of the photovoltaic system compared to conventional systems.

Abstract: This invention boost the original power source to help or cut down the usage of public Power sources.

Abstract: A power conversion circuit includes main terminals that receive a first electrical energy from a main power source. An electric motor has input terminals that are coupled to the main terminals. The electric motor receives a second electrical energy as a current input based on the first electrical energy and converts the electrical energy into mechanical energy to generate a mechanical output. An electric generator generates a current output, which is greater than or equal to the current input, based on the mechanical output. Distribution terminals are coupled to a distribution circuit of a building and receive the current output. Voltage across the input terminals is approximately equal to voltage across the distribution terminals.

Abstract: In a device and a method for controlling an electromechanical power converter (10), particularly of an electric motor and/or generator, comparatively cost-effective switches (14, 18) can be used without drastically decreasing the serviceable life of the entire system. A number of controllable switches (14, 18) can be used for controlling the converter (10), and dividing up a switching load, which is caused when connecting e.g. short-circuiting converter connections (21, 22), to a number of switches (14, 18) over the serviceable life.

Abstract: An exemplary embodiment of the invention is a power system including a first power source, a first DC bus coupled to the first power source and a second DC bus coupled to the first power source. A power conditioning device is coupled to the first DC bus and the second DC bus. A load receives power from the power conditioning device.

Abstract: An electric vehicle accessory motor drive power supply system (40) that utilizes a single power supply design to provide efficient variable speed motor control to both brushless and brush-type DC motors (42,44). The power supply system includes at least one of each type of motor along with a first DC-DC converter (46) that provides operating power to the brushless motor (42) and a second DC-DC converter (48) that provides operating power to the brush-type motor (44). Both converters (46,48) have a power input (52) connected to the electric vehicle's high voltage bus (50) and each includes a data input (54) for receiving a speed control signal (SC) indicative of desired motor speed, as well as an output (56) for providing a motor drive signal to its associated DC motor (42,44).

Abstract: The intra-grid power director comprises a polyphase electric machine having a rotor that can be turned through less than a complete revolution within a stator winding. The rotor winding is connected within a transmission line to a first portion of an electric utility power grid, all portions of which operate at the same frequency. The stator winding is connected to the other portion of the grid so as to generate a rotating magnetic field having the same direction of rotation as the field generated by the rotor winding. The power director also comprises an arrangement for selecting an angular relationship between the stator and rotor windings and for sustaining a resultant torque.

Abstract: A rotating field transformer comprises a torque motor and a rotating electric machine having two sets of windings, each of the windings connected to a respective polyphase electric circuit. The two windings have the same number of magnetic poles and generate coincident rotating magnetic fields having the same direction of rotation. When a torque is applied (e.g., to the shaft of a rotor carrying one of the windings) in the same direction as that of the rotating magnetic fields, electric power is transferred from the rotor-connected circuit to the stator-connected circuit. The rotating field transformer can be used to control the frequency at which power is supplied to a polyphase load, or to manage instabilities in weak links between generating stations.

Abstract: An asynchronous converter comprises a torque motor and a rotating electric machine having two sets of windings, each of the windings connected to a respective polyphase electric circuit. The two windings have the same number of magnetic poles and generate coincident rotating magnetic fields having the same direction of rotation. When a torque is applied (e.g., to the shaft of a rotor carrying one of the windings) in the same direction as that of the rotating magnetic fields, electric power is transferred from the rotor-connected circuit to the stator-connected circuit. When the direction of the torque is reversed, the direction of the power transfer is also reversed. The two polyphase circuits may differ in voltage, in frequency and in number of electrical phases, but it is expected that in most cases the number of phases will be equal to three for both circuits and the operating frequencies of the two circuits will differ by no more than a few percent.

Abstract: Loss of excitation and control and subsequent damage to exciter windings in an excitation system for dynamoelectric machines wherein one or more rotating diodes fail in a shorted mode is prevented through the use of an RC circuit for detecting AC voltages in an exciter field winding for the purpose of directly operating a circuit breaker to remove excitation to the field windings and supply or to activate a timer for such purposes while temporarily shorting the AC current through the exciter field winding.

Abstract: A rotary phase generator for generating 3 phase voltage is provided which can operate off of 230 or 460 volts A-C. Also provided is a rotary phase generator which has two groups of running capacitors for providing a stable voltage on the third phase at no load and light loads. In addition, a booster system is provided for a rotary phase generator to provide high starting torque to one or more of the motors operated on the rotary phase generator. A plurality of smaller rotary phase generators may be connected in parallel and started in time delay sequence to eliminate the heavy starting current when starting the system on one phase power.

Abstract: An electric current regulation, commutation and conversion device, which is particularly adapted for current regulation and commutation in rotating direct current electrical machines and for converting alternating current into direct current or vice versa. At least one conductor is disposed in at least one slot in a ferromagnetic lamination pack, the shape of the conductor cross-section and its arrangement in the slot being such as to intensify the additional resistance caused by the dispersion flow due to the current running therethrough. The magnetic circuit constituted by the lamination pack and linked to the current in the conductor is such as to minimize the inductance of the conductor, and the walls of the conductor containing slot are of such a form and arrangement as to be able to be saturated by an external magnetic control field superimposed on the magnetic field due to the current in the conductor.

Abstract: An inductor-type high frequency generator with alternating current field excitation and frequency changing output means. An excitation winding provides current for the field winding by way of a rectifier, and automatic voltage regulator and an inverter. In response to generator output the A.V.R. controls the d.c. voltage fed to the inverter.