US Patent 7102311 Drive control method and drive controller

A drive controller (10′) of the present invention comprises control means (28, 29, 32 to 38) configured to perform control to cause a driven element to move by a driver (M) and a collision detecting means (20′) configured to detect a collision of the driven element. The collision detecting means detects the collision of the driven element based on an estimated speed deviation which is an estimated deviation from an actual speed of the driven element or an estimated acceleration deviation which is an estimated deviation from an actual acceleration of the driven element.