| 摘要 |
<p>An electric motor (SM) and hydraulic pump/motor (P/M1) are combined on a torque level, a press machine is controlled with controllability of an electric motor (SM), and kinetic energy of a slide (102) is regenerated during braking without constraints of slide pressurization or an amount of energy. A screw press (100) drives a slide (102) through a screw mechanism made up of a drive nut (104) and a driven screw (106). The drive nut (104) is provided with a ring gear (114) integral therewith and this ring gear (114) is engaged with a gear (120) provided for a drive axis of an electric motor (SM) and a gear (122) provided for the drive axis of a hydraulic pump/motor (P/M1). The hydraulic pump/motor (P/M1) is connected to a constant high pressure source (220) that generates a quasi-constant pressure hydraulic liquid and a low pressure source (230). This allows the electric motor (SM) and hydraulic pump/motor (P/M1) to be combined on a torque level. <IMAGE></p> |
