Hitachi, Ltd.

Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Shingo Nishiguchi

Toshisada Mitsui

Hideki Miyazaki

Kazuaki Tobari

Akinori Kamiya

Katsuhiro Hoshino

Kimihisa Furukawa

Kazuto Oyama

Noriya Nakao

Fumikazu Takahashi

Kazuto Ooyama

Stable current control is performed even at the time of occurrence of disturbance, while the steadily occurring current pulsation is suppressed. A motor drive deviceincludes a power conversion circuitthat drives an alternating-current motorand a controllerthat controls the power conversion circuitThe controllerincludes a voltage command calculation unita control state judgement unitand a control gain change unitWhen the determination signal output from the control state judgement unitis switched from a determination signal representing a steady state to a determination signal representing a transient state, the control gain change unitimmediately changes the control gain to a value of normal setting, and when the judgement signal output from the control state judgement unitis switched from a determination signal representing the transient state to a judgement signal representing the steady state, the control gain change unitchanges, with a predetermined delay time, the control gain to a value of high-gain setting.

Motor drive device, controller, and electric vehicle system

A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.

Motor drive device

A power conversion device includes a power switching circuit that has a plurality of series circuits in each of which a switching element that operates as an upper arm and a switching element that operates as a lower arm are connected in series, and a control circuit that generates control signals for controlling the continuity or discontinuity of the switching elements, and, if the relationship between the state of a switching element in a control cycle and the state of the switching element in the next control cycle is a discontinuous relationship, that additionally performs control to make the switching element continuous or discontinuous on the basis of the state of the switching element in the control cycle and the state of the switching element in the next control cycle.

Power conversion device

Growing community of inventors

Hitachinaka, Japan

Shingo Nishiguchi