Abstract: A hybrid power train system for a tractor scraper is provided. The hybrid power train system may include a primary power source coupled to a first set of traction devices, a generator coupled to the primary power source, a first electric motor coupled to a second set of traction devices, an inverter circuit coupled to the generator and the first electric motor, an energy storage device coupled to the inverter circuit, and a controller operatively coupled to the inverter circuit. The controller may be configured to engage a first operation mode enabling electrical energy, supplied by the generator and the first electric motor, to be stored in the energy storage device, and engage a second operation mode enabling electrical energy, stored in the energy storage device, to be supplied to the first electric motor to drive the second set of traction devices.

Abstract: A hybrid power train system for a tractor scraper is provided. The hybrid power train system may include a primary power source coupled to a first set of traction devices, a generator coupled to the primary power source, a first electric motor coupled to a second set of traction devices, an inverter circuit coupled to the generator and the first electric motor, an energy storage device coupled to the inverter circuit, and a controller operatively coupled to the inverter circuit. The controller may be configured to engage a first operation mode enabling electrical energy, supplied by the generator and the first electric motor, to be stored in the energy storage device, and engage a second operation mode enabling electrical energy, stored in the energy storage device, to be supplied to the first electric motor to drive the second set of traction devices.

Abstract: Systems and methods are disclosed for controlling a torque output by an AC motor drawing power from a DC bus. According to certain embodiments, the system for controlling the torque output has a controller and an inverter. The controller further has an operation status detector, a basic voltage vector calculator, and a voltage command generator. The operation status detector is configured to determine a DC bus voltage and a rotor field vector. The basic voltage vector calculator is configured to calculate a plurality of basic voltage vectors having a magnitude proportional to the DC bus voltage. The voltage command generator is configured to generate a voltage command for producing a stator field vector. Producing the stator field vector includes at least one of maintaining a constant angle between the stator field vector and the rotor field vector, and setting a magnitude of the stator field vector equal to the magnitude of the plurality of basic voltage vectors.

Abstract: Systems and methods are disclosed for controlling a torque output by an AC motor drawing power from a DC bus. According to certain embodiments, the system for controlling the torque output has a controller and an inverter. The controller further has an operation status detector, a basic voltage vector calculator, and a voltage command generator. The operation status detector is configured to determine a DC bus voltage and a rotor field vector. The basic voltage vector calculator is configured to calculate a plurality of basic voltage vectors having a magnitude proportional to the DC bus voltage. The voltage command generator is configured to generate a voltage command for producing a stator field vector. Producing the stator field vector includes at least one of maintaining a constant angle between the stator field vector and the rotor field vector, and setting a magnitude of the stator field vector equal to the magnitude of the plurality of basic voltage vectors.

Abstract: Systems and methods are disclosed for reducing engine fuel consumption during regenerative braking. According to certain embodiments, the regenerative braking system has an engine, a generator, a rectifier, a first inverter, a traction motor, and a reverse recovery unit. The generator is configured to be driven by the engine to produce AC electrical power. The rectifier is configured to receive AC electrical power from the generator and convert the AC power to DC power. The first inverter is configured to receive the DC power and convert the DC power to AC power. The traction motor is configured to be driven by the AC power in a traction mode, and to produce regenerated power when rotated in reverse in a regenerative braking mode. The reverse recovery unit has a second inverter and a filter.

Abstract: A control system for an alternating current (AC) machine having a rotor and a stator is disclosed. The control system may include a direct current (DC) link providing a variable DC link voltage; an inverter module operatively coupled between the DC link and the AC machine, and a controller in communication with the inverter module. The inverter module may include a plurality of gates in selective communication with each phase of the stator. The controller may be configured to receive a signal indicative of the variable DC link voltage, receive a signal indicative of a rotational speed of the rotor, receive a torque command, and generate a direct-axis current command and a quadrature-axis current command using the variable DC link voltage, the rotational speed, and the torque command as inputs into a three-dimensional lookup table preprogrammed into a memory associated with the controller.

Abstract: A system for determining an initial rotor position of an interior permanent magnet (IPM) machine having a rotor and a stator is provided. The system may include a drive circuit in operative and electrical communication with each phase of the IPM machine, and a controller in electrical communication with the drive circuit. The controller may be configured to engage the drive circuit to selectively apply a voltage signal to each phase of the stator of the IPM machine, detect a current signal through each phase corresponding to the applied voltage signal, and calculate the initial rotor position based on a least squares analysis between at least the voltage signal, the current signal and a predefined inductance of the IPM machine.

Abstract: The present disclosure is related to a method for energy management for an electric drive system during regenerative braking of a machine. The machine includes an electric drive assembly. The electric drive assembly includes a generator, a motor, a primary direct current bus and a secondary direct current bus having a regenerative brake assembly. The method of energy management includes connecting at least a chopper and a crowbar across the secondary direct current bus. Further, the method includes directing a secondary power stored during regenerative braking, from the primary or secondary or both the buses through the chopper or the crowbar during fault condition.

Abstract: The present disclosure is related to a method for regenerative braking of a machine. The machine includes an electric drive assembly. The electric drive assembly includes a generator, a motor and a direct current bus and a regenerative brake assembly disposed between them. The regenerative braking assembly includes an inverter. The method includes connecting a phase leg between the direct current bus and the inverter. The phase leg includes an inductor and an electric switch. The phase leg boosts the regenerative voltage. The boosted regenerative voltage is then fed back to control a braking torque from the motor and directed back to the generator.

Abstract: A control system for use with a motor is disclosed. The control system may have a controller that is configured to receive a torque command for the motor and receive a rotor angular velocity signal indicative of an angular velocity of a rotor of the motor. The controller may also be configured to generate a field weakening command by adding a field weakening adjustment signal to the rotor angular velocity signal, and generate a torque voltage command and a flux voltage command based on the torque command and the field weakening command. Further, the controller may be configured to convert the torque voltage command and the flux voltage command into phase voltage commands and output the phase voltage commands.

Abstract: A system for determining an initial rotor position of an interior permanent magnet (IPM) machine having a rotor and a stator is provided. The system may include a drive circuit in operative and electrical communication with each phase of the IPM machine, and a controller in electrical communication with the drive circuit. The controller may be configured to engage the drive circuit to selectively apply a voltage signal to each phase of the stator of the IPM machine, detect a current signal through each phase corresponding to the applied voltage signal, and calculate the initial rotor position based on a least squares analysis between at least the voltage signal, the current signal and a predefined inductance of the IPM machine.

Abstract: A ground fault detection system may include a direct current (DC) voltage source and an alternating current (AC) device. The ground fault detection system may also include an inverter, coupled to the DC voltage source, the AC device and an electrical ground, including: a positive rail, a negative rail and a plurality of switch elements, wherein each of the plurality of switch elements may be coupled to the positive rail, the negative rail and the AC device. The ground fault detection system may further include a voltage monitoring device coupled to the positive rail, the negative rail and the electrical ground and an electronic controller, coupled to the inverter and the voltage monitoring device configured to: control the plurality of switching elements, sample a voltage potential across the voltage monitoring device at predetermined time periods and determine a ground fault of the inverter based at least in part on the sampled voltage potential and the predetermined time periods.

Abstract: A gear train may include a first planetary gear set, which may include a first sun gear, a first ring gear, and a first carrier. The gear train may also include a second planetary gear set, which may include a second sun gear, a second ring gear, and a second carrier. Additionally, the gear train may include a first clutch configured to selectively connect the first carrier with the second carrier, as well as a second clutch configured to selectively connect the first sun gear with the second sun gear. The gear train may also include a first brake configured to selectively fix the second sun gear, as well as a second brake configured to selectively fix the first carrier.

Abstract: An improved system and method for starting an engine of an electric drive machine is disclosed. The method includes supplying electric current from a first energy storage device to inductive windings of a propulsion motor. The method also includes accumulating energy in the inductive windings of the propulsion motor based on a magnetic field created when the supplied electric current flows through the inductive windings. Electrical energy is generated by regulating a first plurality of switches associated with a first inverter to cause a collapse of the accumulated energy in the inductive windings. Such electrical energy is stored in an energy storage device. A controller regulates a second plurality of switches associated with a second inverter to cause a release of the stored electrical energy. The released electrical energy is supplied to a generator to start the engine.

Abstract: A control system for use with a motor is disclosed. The control system may have a controller that is configured to receive a torque command for the motor and receive a rotor angular velocity signal indicative of an angular velocity of a rotor of the motor. The controller may also be configured to generate a field weakening command by adding a field weakening adjustment signal to the rotor angular velocity signal, and generate a torque voltage command and a flux voltage command based on the torque command and the field weakening command. Further, the controller may be configured to convert the torque voltage command and the flux voltage command into phase voltage commands and output the phase voltage commands.

Abstract: A multi-mode hybrid drive train offers selective operation in any one of series, parallel, and power split modes. The multi-mode hybrid drive train includes two planetary gear sets and a collection of specifically placed brakes and clutches relative to those gear sets. The first planetary gear train includes a power input for receiving power from a primary rotational power source, as well as a first sun gear, first carrier and first ring gear. The second planetary gear train similarly includes a power input as well as a second sun gear, a second carrier connected to a final drive, and a second ring gear. A first motor is linked to the first sun gear and a second motor is linked to the second sun gear such that selective activation of the clutches, brakes, and motors places the multi-mode hybrid drive train in a selected mode of operation.

Abstract: A multi-mode hybrid drive train offers selective operation in any one of series, parallel, and power split modes. The multi-mode hybrid drive train includes two planetary gear sets and a collection of specifically placed brakes and clutches relative to those gear sets. The first planetary gear train includes a power input for receiving power from a primary rotational power source, as well as a first sun gear, first carrier and first ring gear. The second planetary gear train similarly includes a power input as well as a second sun gear, a second carrier connected to a final drive, and a second ring gear. A first motor is linked to the first sun gear and a second motor is linked to the second sun gear such that selective activation of the clutches, brakes, and motors places the multi-mode hybrid drive train in a selected mode of operation.

Abstract: An improved dual mode EPPV transmission hybrid electric drive system uses a combination of power sources including an internal combustion engine, a first electric motor, and a second electric motor, and provides more efficient operation and compact installation. The improved dual mode EPPV transmission hybrid electric drive system includes a first planetary gear set including a first sun gear linked to a first ring gear via a pinion on a first carrier, and a second planetary gear set including a second sun gear linked to a second ring gear via a pinion on a second carrier, wherein the various elements of the planetary gear sets are configured to allow a dual mode synchronous shift operation. The system includes a first clutch and a second clutch, both of which may be dry clutches, for changing the mode of the transmission from a high mode to a low mode and vice versa.

Abstract: A gear train includes a first planetary gear set including a first sun gear, a first ring gear, and a first carrier and a second planetary gear set including a second sun gear, a second ring gear, and second carrier. The gear train also includes a first clutch configured to selectively connect the first carrier with the second carrier and a second clutch configured to selectively connect the first sun gear with the second sun gear. The gear train also includes a first brake configured to selectively fix the first sun gear, a second brake configured to selectively fix the second sun gear, and a third brake configured to selectively fix the first carrier.

Abstract: The present disclosure is directed to a gear train. The gear train may include a first planetary gear set, which may include a first sun gear, a first ring gear, and a first carrier. The gear train may also include a second planetary gear set, which may include a second sun gear, a second ring gear, and a second carrier. Additionally, the gear train may include a first clutch configured to selectively connect the first carrier with the second carrier, as well as a second clutch configured to selectively connect the first sun gear with the second sun gear. The gear train may also include a first brake configured to selectively fix the second sun gear, as well as a second brake configured to selectively fix the first carrier.