Honda Motor Co., Ltd.

Yasuyuki Danjo

Fumio Anraku

Yuji Saito

Hiroshi Otsuka

Yuji Fujita

Tetsu Sugiyama

Naoki Imai

Hideki Inoue

Masaharu Hosoda

Junji Kato

Masami Nakamura

There is provided a control system for an electric motor to which electric power is supplied from a DC power supply via a multi-phase inverter, the multi-phase inverter including switch units respectively provided on a positive side and a negative side of arms corresponding to respective phases, each switch unit including a switching element and a reflux diode connected in parallel thereto. The control system comprises a phase current detection unit for detecting phase currents which flow between the inverter and the electric motor, a DC component acquiring unit for acquiring DC components of the respective phase currents, and a short-circuiting determination unit for determining that a short-circuit failure occurs in the inverter when at least one of the DC components of the phase currents acquired by the DC component acquiring unit exceeds a threshold. Consequently, the short-circuit failure of the inverter can be detected even though the control of the electric motor is stopped.

Electric motor control system

When a short-circuit failure of any of switch portions () including switch elements () and parallel-connected feedback diodes () of an inverter circuit () is detected during the operation of a motor (), a switch portion () where the short-circuit failure has occurred is checked for whether it is on the positive polarity side or the negative polarity side. The switch elements () are so controlled that all the switch portions () on the same polarity side as where the short-circuit has occurred are brought into a conducted state and all the others are disconnected. This prevents a large electric current from flowing into each switch portion of the inverter circuit without requiring any switch to block the power distribution between a motor and the inverter circuit when a short-circuit failure of the switch portion of the inverter circuit occurs.

Controller for motor, and vehicle

Disclosed herein is a capacitor mounting type inverter unit having a cooling block, an inverter including a plurality of phases of switching circuits provided on the cooling block, and a smoothing capacitor. The inverter unit includes a cover having a first recess for accommodating the inverter and a second recess for accommodating the smoothing capacitor. The second recess has a depth larger than that of the first recess. The second recess is filled with resin in the condition where the smoothing capacitor is accommodated in the second recess.

Capacitor mounting type inverter unit having a recessed cover

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Wako, Japan

Yasuyuki Danjo