| 摘要 |
PROBLEM TO BE SOLVED: To exert regenerative braking during deceleration operation.SOLUTION: A generator 4 connected with an engine 2 generates AC power, a converter 14 and an inverter 16 connected with the generator 4 perform AC-AC conversion, and supply operation power to a three-phase motor 10. A power storage device 20 is connected to the input side of an inverter 16 via a chopper 18. A controller 22 obtains a rotational speed command and a torque current command value of the three-phase motor 10 from a lever 22 and a pressure sensor 24, controls charge-discharge by the chopper 18 to the power storage device 20, and removes the limit of charging current or increases the limit value of charging current during deceleration operation of the three-phase motor. |
