Patent ID: 7619377

Claim:
A linear motor system, comprising: a linear motor, wherein a moving element, which includes magnetic loading member formed of permanent magnets, and a stator, which includes magnetic loading member formed of windings having winding faces opposite the permanent magnets, are positioned opposite each other, separated by a gap, and wherein the stator is formed of a plurality of winding groups separated in a stroke direction, and phase windings of individual phases that form each winding group, to include a winding start terminal and a winding end terminal; a controller, for supplying a variable voltage having a variable frequency to the linear motor; and a winding switching device, for closing or opening, as needed, the phase windings for the individual phases that form the plurality of winding groups separated in the stroke direction, wherein the winding switching device includes; a three-phase rectifying member, a semiconductor switch located on both direct-current output sides of the three-phase rectifying member and a resistor and a capacitor connected in parallel to the semiconductor switch, one end of each of the phase windings, which form the plurality of winding groups separated in the stroke direction, is connected to an output end of the controller, and the other end is connected to an alternating-current input side of the three-phase rectifying member of the winding switching device, and the semiconductor switch included in the winding switching device is opened or closed to excite only a desired winding group of the plurality of winding groups separated in the stroke direction.