HYBRID ACCELERATION SYSTEM FOR SPINDLE UNIT IN A MACHINE TOOL ASSEMBLY

摘要

A computer controlled machine tool assembly has a spindle (150) attached to a main spindle shaft (144). A vector motor (168) is coupled to the main spindle shaft to control rotation of the main spindle shaft under computer control (182). A flywheel shaft (200) has a flywheel (206) and a speed sensor (210) for sensing a rotational speed of the flywheel shaft and is coupled to the main spindle shaft by a first pulley (218) through a computer controlled clutch (202). The computer controlled clutch engages the flywheel shaft to the main spindle shaft under computer control. An acceleration motor (164) is coupled to the flywheel shaft through a second pulley (208) and a one way clutch (204), where the acceleration motor is activated under computer control responsive to the rotational speed of the flywheel shaft.