Oki Electric Industry Co., Ltd.

Mitsubishi Electric Corporation

Yoshinori Kanda

Hisao Fukushima

Michio Ito

Norimi Koiwa

Katsuhito Watanabe

Tetsuya Okuda

Akiko Tabuchi

Kazuyoshi Watabu

Tsutomu Watanabe

Yo Takahashi

An AC motor drive motor system includes a charge and discharge controller controlling a charging and discharging circuit based on a DC voltage value on the output side of a converter and a charging and discharging current value of a power storage device. The charge and discharge controller, when regenerative power via an inverter from an AC motor exceeds a power threshold, charges the power storage device such that the DC voltage value becomes a voltage threshold corresponding to the power threshold. When regenerative power is the power threshold or less, the converter performs regeneration when the DC voltage value reaches a regeneration start voltage threshold or higher, and ends regeneration when the DC voltage value reaches a regeneration end voltage threshold or lower. The DC-voltage-value time averaged value during regeneration is set lower than that at no-load time when the converter does not perform power supply and regeneration.

AC motor drive system

When regenerative power from an AC motor via an inverter exceeds a predetermined power threshold, a charging/discharging control unit, which outputs a control signal for controlling the inverter on the basis of a DC bus voltage value and a charging/discharging current value, causes a power storage device to be charged such that the DC bus voltage value becomes a voltage threshold corresponding to the power threshold and causes a charging current at a start time of charging to the power storage device to start from a charging current value that is based on a DC bus voltage value.

An energy assist system selection supporting apparatus equipped with a step-up/step-down chopper unit, an electricity storage unit, and an electric motor configured to drive a machine includes an operation-pattern generating section for generating an operation pattern taking into account an electronic machine configuration, a load-pattern generating section for generating a load pattern concerning power consumption according to the generated operation pattern, a data processing section for evaluating, according to the generated load pattern, a characteristic of the energy assist system applied with the generated operation pattern while comparing the characteristic with a limit value and generate, according to an evaluation result, configuration information including the number of each unit of the energy assist system, and a layout section configured to lay out and arrange the units on a virtual space and display the units on a display screen according to the generated configuration information.

Energy assist system selection supporting apparatus, capacity selecting apparatus, power consumption calculating apparatus, and layout generating apparatus

Telephone set

Vehicular telephone set or similar article

Growing community of inventors

Tokyo, Japan

Yoshinori Kanda