Linear motor driver having a position detection means

Abstract

There is disclosed a linear motor driver for a permanent magnet movable type linear motor employing a stator and a movable element, the driver performing the partial excitation of the movable element. The driver includes a stator having coil block and disposed on an inner bottom surface of a U-shaped frame, a movable element having a plurality of permanent magnets at an armature frame, a shield member provided on one side surface of the movable element, and having a magnet sensing unit formed on one side surface thereof for blocking magnet fields generated from the plurality of permanent magnets, and a controller board disposed on an inner wall of the U-shaped frame, and for sensing magnet fields generated from the magnet sensing unit to selectively supply an electric current into the coil block. Thus, an erroneous recognition of the position of the movable element can be prevented which may occur due to the magnet fields generated from the permanent magnets used for creating a thrust force of the motor. Therefore, an optimum driving condition for the linear motor can be accomplished. Further, by partly exciting the coils to drive the movable element, the power consumption by the coils can be reduced, and heat generated when the current flows into the coils can be minimized.