Patent ID: 9024548
Filing Date: 2015-05-05
Classification: H02P

Abstract:
1. A method of controlling a linear motor having a stator which is provided in an extended manner and a slider which moves along the stator, the method comprising the steps of: storing a stored pole position correction value in correspondence to each of a plurality of stroke positions along a direction of extension of the stator, the stored pole position correction value being a value for correcting a position deviation of a salient pole of the stator along the direction of extension of the stator; detecting a stroke position of the slider which moves along the direction of extension of the stator; deriving a derived pole position correction value at the detected stroke position of the slider based on the stored pole position correction value; calculating a pole position of the slider which is a relative position of the pole of the slider with respect to the salient pole of the stator based on the detected stroke position of the slider and the derived pole position correction value; and supplying electric power to a coil provided in the stator or in the slider based on the calculated pole position of the slider, and driving the linear motor.