Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Tsubishi Heavy Industries, Ltd.

Osamu Nakakita

Yoshimi Okazaki

Masato Mitsuhashi

Fujio Eguchi

Masayuki Tanaka

Hiroyuki Yamazaki

Takao Sakurai

Mitsugu Nakamura

Masayuki Morimoto

Hiroyuki Suzuki

Hirotaka Uehara

Kazuki Watanabe

Yoshihide Iwamoto

Teruo Mizuno

Kazuya Fukuda

Atsushi Nakao

Tatsuyuki Amamiya

A processing unit of a command generation device which is provided separately from a general-purpose inverter, performs following processing. A rotation calculation unit calculates a value relating to a rotation of a rotor of a virtual power generator when the virtual power generator is driven according to an active power command based on a rotor model that simulates a driving of the virtual power generator and calculates a value relating to the rotation of the rotor of the virtual power generator and an active power command. A target determination unit determines a target value of a voltage frequency and a target value of an active power based on the calculated value relating to the rotation. A command generation unit generates a control command for the inverter based on the determined target value of the voltage frequency and the target value of the active power. A time constant relating to a synchronization power of the rotor model matches a time constant relating to a synchronization power of the AC power generator.

Command generation device and command generation method in multiple power generation power supply system

This command generation device generates a control command for a power conversion device which converts DC power outputted by a DC power supply device to AC power and supplies the same to a bus, and which converts AC power from the bus to DC power and supplies the same to the DC power supply device. Said command generation device comprises: a virtual power generation calculation unit which simulates the driving of a virtual power generator and, on the basis of a rotor model that calculates the rotational speed of the virtual power generator, calculates the root-mean-square voltage and phase of the virtual power generator; a bus calculation unit which calculates the voltage and phase at a point of contact between the power conversion device and the bus; a phase difference angle calculation unit which calculates the phase difference angle between the phase of the virtual power generator and the phase at the point of contact; a target power determination unit which determines a target value for the effective power of the power conversion device on the basis of the root-mean-square voltage of the virtual power generator, the voltage at the point of contact and the phase difference angle; and a command generation unit which generates a control command for the power conversion device on the basis of the determined target value for the effective power.

Command generation device and command generation method

A combined electric power generations' supply system includes an AC power generator that supplies power by off grid independent operation, a DC power supply device, an inverter that converts DC power output by the DC power supply device into AC power. The rotation calculation unit calculates a value relating to a rotation of a rotor when driving the virtual power generator according to an active power command based on a rotor model calculates a value relating to the rotation of the rotor of the virtual power generator and the active power command. The output determination unit determines values relating to an active power and a reactive power to be output to the inverter based on the calculated value relating to the rotation. The modulation control unit performs control of a pulse width modulation of the inverter based on the determined value relating to the active power and reactive power. A time constant relating to synchronization power of the rotor model matches a time constant relating to synchronization power with the AC power generator.

Combined electric power generations' supply system in off grid independent operation

A rotation calculation unit calculates a rotation speed of a virtual generator on the basis of a rotor model to simulate driving of the virtual generator and calculates the rotation speed of the virtual generator. A target power determination unit determines target values of active power and reactive power of an inverter on the basis of the calculated rotation speed. A command generation unit generates a control command for the inverter on the basis of the determined target values of the active power and the reactive power.

An inverter apparatus is composed of an insulated metal substrate, a conductive stud, a printed circuit board, a conductive spacer, and a bus bar. An inverter output stage is mounted on the insulated metal substrate. The conductive stud is coupled to a main surface of the insulated metal substrate, and electrically connected with the inverter output stage. The printed circuit board is supported by the stud. The stud is coupled on the rear surface of the printed circuit board. Provided on the main surface of the printed circuit board is a circuit connected to the inverter output stage. The conductive spacer is coupled on the main surface of the printed circuit board, and electrically connected with the stud. The bus bar is coupled to the spacer.

Inverter apparatus suitable for battery vehicle

A slip control device, a slip control method, and a vehicle provided with such a slip control device are provided, with which the vehicle can travel stably even on a slippery road surface while maintaining good road holding. The device has torque directive control means () for calculating torque directives for the motors respectively based on accelerator pedal depressions () and steering angles () and outputting them to each of motor control sections () of the motors, first reference speed calculation means () for calculating a first reference speed of one of the pair of left and right motors to be controlled based on rotation speed of the other motor, and restriction applying means () for applying restriction to each of the torque directives based on a permissible speed range determined for each of the motors by applying prescribed permissible speed deviation to each of the calculated reference speeds.

Electric vehicle, and device and method of controlling slip thereof

A forklift having a cargo apparatus, the responsiveness of which to the operation by a user is improved. The forklift has: a DSP which generates a frequency instruction f* in response to the operation to a cargo apparatus operation lever, a voltage instruction V* from the frequency instruction f* by using the VVVF control, inverter control signals from the voltage instruction v*; an inverter which generates the three-phase electric power in response to the inverter control signal; a hydraulic pump; an induction motor driving a hydraulic pump by using the three-phase electric power; and a cargo apparatus which is driven by the hydraulic pressure supplied from the hydraulic pump.

Forklift and method for controlling induction motor applied to the same

A rotating speed detecting apparatus has: a bearing sensor configured to detect rotation of a motor and output detection pulses whose frequency depending on a rotating speed of the motor; and a calculating unit configured to receive the detection pulses from the bearing sensor. The detection pulses include a first pulse and a second pulse output next to the first pulse. The calculating unit calculates a revolution of the motor from a pulse interval between the first pulse and the second pulse.

Rotating speed detecting apparatus

A propulsion motor control apparatus for a battery vehicle including; a steering angle detection device for detecting a steering angle subtended between a common axis of two front wheels, and an axis of a rear wheel. Also included is a ratio computing device for computing a ratio between a distance between an intersection point of the two axes and a front wheel (outer wheel) on a side further from the intersection point, and a distance between the intersection point and a front wheel (inner wheel) on a side closer to the intersection point, based on the steering angle, a function determining device for determining a motor rotation speed/current command value function for the inner wheel based on a motor rotation speed/current command value function for the outer wheel and the obtained ratio, and a control device for individually controlling the respective propulsion motors for the two front wheels based on the two functions.

Propulsion motor control apparatus for battery vehicle

A regenerative braking apparatus for a battery operated vehicle includes rotation direction detection devices for detecting the rotation directions of respective axles of two front wheels, a current direction judgment device for judging respective field current directions of two propulsion motors based on respective outputs from the rotation direction detection devices, and a current direction control device for controlling the field current direction of the propulsion motors based on the output from the current direction judgment device. In this way, even when close to the steering angle for inner wheel stop turning, concern for external action rotation of the propulsion motor for driving the inner wheel is eliminated, enabling control of regeneration at the time of turning to be carried out with good efficiency.

Growing community of inventors

Kanagawa-ken, Japan

Osamu Nakakita