High speed solenoid

1. A high speed solenoid comprising:

a movable shaft linearly movable in an axial direction;

a movable coil unit coupled to the movable shaft; and

a magnetic field forming unit forming a magnetic field in a direction perpendicular with respect to that of a current flowing in the movable coil unit,

wherein the magnetic field forming unit includes a permanent magnet, a first yoke, and a second yoke, the first yoke being connected to one side of the permanent magnet and the second yoke being connected to an opposing side of the permanent magnet,

wherein when a current is applied to the movable coil unit, the movable coil unit is moved by a magnetic field formed by the magnetic field forming unit to move the movable shaft,

wherein the movable coil unit comprises a coil, a winding member allowing the coil to be wound there around and formed by laminating a plurality of prepregs, and a movable support fixedly coupling the winding member to the movable shaft, and

wherein the permanent magnet is disposed inside a space defined by the winding member, and

wherein the plurality of prepregs of the winding member are spaced apart from one another, and the coil is wound in the space between the plurality of prepregs.

2. The high speed solenoid of claim 1 , wherein the winding member comprises a plurality of laminated main prepregs and a plurality of auxiliary prepregs laminated between the main prepregs such that the space is formed between the plurality of main prepregs to allow the coil to be wound therein.

3. The high speed solenoid of claim 2 , wherein the auxiliary prepregs have a length that is shorter than a length of the main prepregs allowing the space to be formed between the main prepregs.

4. The high speed solenoid of claim 1 , wherein the magnetic field forming unit comprises:

a permanent magnet disposed within or outside of the movable coil unit and forming a magnetic field in a direction perpendicular with respect to that of a current flowing in the movable coil unit; and

a first yoke and a second yoke connected by the permanent magnet, disposed within and outside of the movable coil unit, and concentrating magnetic flux of the magnetic field formed by the permanent magnet on the movable coil unit.

5. The high speed solenoid of claim 4 , Wherein the first yoke and the second yoke are connected to one side and the other side of the permanent magnet to form a magnetic flux path.

6. The high speed solenoid of claim 1 , further comprising a guide unit surrounding the circumference of the movable shaft to guide a linear movement of the movable shaft.

7. The high speed solenoid of claim 1 , further comprising a cover supporting the movable shaft and forming a movement space of the movable coil unit.

8. The high speed solenoid of claim 1 , wherein the space is formed between adjacent prepregs.

9. The high speed solenoid of claim 1 , wherein the prepregs are arranged concentrically with respect to one another.

10. The high speed solenoid of claim 1 , wherein a plurality of spaces are formed between a plurality of adjacent prepregs, and the coil is wound in the plurality of spaces.

11. The high speed solenoid of claim 1 , wherein the coil is wound in a plurality of layers, each of the layers being disposed between the plurality of prepregs.

12. The high speed solenoid of claim 1 , wherein the prepregs support each of the plurality of wound layers of the coil on both sides.

13. The high speed solenoid of claim 1 , wherein the coil is firmly inserted between the prepregs.

14. The high speed solenoid of claim 1 , wherein the space between the prepregs corresponds to the thickness of the coil.