| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide hybrid construction machinery which uses a pressure increasing/decreasing converter capable of efficiently driving each electric motor, while suppressing damage to or breakage in equipment for electric drive. <P>SOLUTION: One side of the pressure increasing/decreasing converter 100A is connected to a motor generator 12, a generator 30 and a lifting magnet 6 via a DC bus 110A and inverters 18A and 18B, and the other side thereof is connected to a battery 19. The pressure increasing/decreasing converter 100A increases/decreases pressure depending on the driving states of the motor generator 12, the generator 30 and the lifting magnet 6. One side of the pressure increasing/decreasing converter 100B is connected to an electric motor 21 for slewing via a DC bus 110B, and the other side thereof is connected to the battery 19. The pressure increasing/decreasing converter 100B increases/decreases the pressure depending on the operational state of the electric motor 21. The motor generator 12 and the electric motor 21 for slewing, different in declared power from each other, are connected to the discrete DC buses 110A and 110B, respectively, and voltage values of them are independently controlled. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
