Abstract: A linear motor includes an outer case; a stator installed at the inner side the outer case and having a first and a second armature coil parts; a first to a third shafts assembled in the inner side of the first and the second armature coil parts of the stator; a first permanent magnet part having a plurality of permanent magnets assembled in a ring-type at the outer circumferential surface of the first shaft; and a second permanent magnet part having a plurality of permanent magnets assembled at the outer circumferential surface of the third shaft. Since the first permanent magnet and the second permanent magnet are separately constructed on the outer circumferential surface of the shaft to be assembled, the linear movement of the linear motor can be precisely controlled when the linear motor is linearly moved, and the permanent magnet to be assembled at the rotation movement zone can be attached later.

Abstract: A nozzle rotating apparatus of a module head of a surface mounting device is capable of correcting an error occurring when a nozzle picks an electronic component and places it on a printed circuit board. The nozzle rotating apparatus of a module head of a surface mounting device for picking up an electronic component and placing it at a predetermined position, includes: a head movable in a predetermined direction along an upper portion of a substrate and having at least one shaft; a driving means for driving the head; a nozzle mounted at a lower predetermined portion of the head to pick up and place the electronic component; pinions installed at the outer periphery of the shaft installed at a predetermined portion of the head; a rack engaged with the pinions; and a driving force transmitting means for moving the rack to a predetermined direction.

Abstract: A planar motor moved in the X-Y direction on a plane includes a mover having an armature coil part installed at the bottom of an armature frame, for receiving an electric signal, and a stator with a first permanent magnet part installed having S-pole permanent magnets and N-pole permanent magnets arranged in a manner that a corner of the N-pole permanent magnets contacts four corners of the S-pole permanent magnets on the surface of a stator frame installed facing the armature coil part of the mover, and inserted permanent magnets arranged at spaces formed as the corners of the S-pole permanent magnets contact the corners of N-pole permanent magnets. Since the inserted permanent magnets are arranged at the first or the second permanent magnet part, the packing density of the permanent magnets can be increased, and accordingly, as the leakage flux is reduced, more stronger thrust can be attained.

Abstract: A linear motor capable of effectively cooling heat generated when the linear motor is driven is provided where the motor includes a moving element having the lower portion with a plurality of field magnets. The motor includes a stator element having an upper portion with a plurality or coil units arranged at a constant spacing, and heat dissipating members coupled to the stator element at constant spacing, for externally dissipating heat generated by the stator. An improved cooling effect can be achieved by the provision of heat pipes having heat dissipating fins formed thereon, or by use of thermoelectric semiconductor cooling modules.

Abstract: An apparatus for controlling cooling of a linear motor includes: a stator having a first temperature sensor, a heat sink and at least one cooling fan installed at a predetermined portion thereof; a mover having a second temperature sensor and a heat sink installed at the upper surface thereof; an encoder for sensing a position of the mover and generating a position signal; an A/D converter for receiving and converting signals from the first and the second temperature sensors and outputting a first and a second temperature sensing signals; a controller for generating a plurality of cooling fan control signals and an air valve control signal to cool the heat generated from the stator and the mover; a D/A converter for converting the plurality of cooling fan control signals and the air valve control signal and transmitting a plurality of drive signals to the plurality of cooling fans and to the air valve; and a mover driver for providing a drive signal to a coil block.

Abstract: The present invention relates to a linear motor with an improved cooling structure for cooling heat generated from a coil block of the motor. The linear motor includes a stator element having a stator element frame, a movable element having a movable element frame, adapted to linearly move along the stator, and a heat dissipation plate mounted on the stator element frame and the movable element frame, for externally dissipating heat generated from a coil block. Such a structure can prevent over-heating of the linear motor by dissipating heat generated from the motor coil to thereby cool the motor.

Abstract: There is disclosed a system for preventing malfunction of a switching circuit for a linear motor capable of preventing malfunction of the switching circuit due to magnet flux from the permanent magnet mounted on the movable element, the system including sensing magnets provided at a longitudinal one side of a movable element having a plurality of permanent magnets mounted thereon, a plurality of Hall sensors mounted on the stator element and used for controlling current flow into a plurality of armature coils by turning on/off a switching circuit, based upon the sensing of magnet flux generated from the sensing magnets, and dummy sensing magnet provided at one side end of the sensing magnet in such a manner that its polarity is opposite to that of the sensing magnet, and for preventing magnets flux generated from the plural permanent magnets from introducing into the plural Hall sensors.