ELECTRIC WORK MACHIN

Abstract: a control device of an electric hydraulic excavator sets or computes a rotation speed command and an allowable torque of an electric motor on the basis of a required rotation speed of the electric motor, and a sum of a suppliable electric power of a converter and a battery suppliable electric power. an inverter of the electric hydraulic excavator sets the allowable torque to a torque command if a calculated torque of the electric motor computed by multiplying by a gain, a difference between the rotation speed command and a rotation speed of the electric motor, exceeds the allowable torque, and sets the calculated torque to the torque command if the calculated torque does not exceed the allowable torque. the inverter supplies the electric power that can generate a torque corresponding to the torque command to the electric motor.

Inventor(s): Akira WATANABE, Ken TAKEUCHI, Yuki MAKIMURA, Kenta TANIGAKI, Seiji ISHIDA

CPC Classification: E02F9/207 (DREDGING; SOIL-SHIFTING (winning peat ))

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