Linear motor mounted press machine and method for controlling linear motor mounted press machine

The present invention provides a linear motor mounted press machine that generate an optimum thrust for a press tonnage to perform different machining operations including one requiring a greater press tonnage and one requiring a high speed and a smaller press tonnage in an energy efficient manner. A linear motor mounted press machine includes a first linear motor , a second linear motor that produces a thrust lower than or equivalent to that of the first linear motor , and a coupling switching mechanism that releasably couples output shafts of the first and second linear motor together. A press tool is driven forward and backward by the output shaft of the second linear motor . Each of first and second linear motors is a unit linear motor assembly having a plurality of unit linear motors arranged around a press working axis center P. The number of the unit linear motors of the second linear motor is the same as or smaller than that of the first linear motor