JPH0747924Y2 - Magnetic levitation device - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a magnetic levitation device, in which a magnetic bearing is provided on the upper surface of a movable part so as to oppose a guide rail, and a stator and a movable part installed on the ground are provided. The present invention relates to a two-axis control type magnetic levitation device that is driven by a linear induction motor composed of a secondary conductor arranged on the lower surface.

[Problems to be Solved by Prior Art and Invention] FIG. 3 is a front view showing an example of a 5-axis control type magnetic levitation device driven by a linear induction motor. In FIG. 3, the frame 1 is provided so as to straddle the guide rail 2, and the primary side stator 8 is arranged on the upper surface of the guide rail 2. A coil for generating a moving magnetic field is wound around the stator 8. Frame 1
Magnetic bearings 3 and 4 for vertical levitation are disposed in the seat portion of the frame 1, and magnetic bearings 5 and 6 for horizontal guidance are provided on the left and right inner surfaces of the frame 1. A secondary conductor 7 is provided on the ceiling surface of the frame 1 so as to face the stator 8.

In the five-axis control type magnetic levitation device configured as described above, a vertical gap and a horizontal gap are detected by a sensor (not shown), and the magnetic bearing is detected based on the detected output.
3,4,5,6 are controlled, and the frame 1 floats from the guide rail 2 and moves by the moving magnetic field generated by the stator 8. Such a 5-axis control type magnetic levitation device has good dumbing and high rigidity, but has a drawback that it consumes a large amount of power because of the large number of control axes and cannot be used for curved rails.

FIG. 4 is a front view showing an example of a three-axis control type magnetic levitation device driven by a linear induction motor. In FIG. 4, magnetic bearings 13 and 14 are provided on the frame 11 so as to face two parallel guide rails 12 and 12, respectively. A secondary conductor 16 is provided on the lower surface of the frame 11, and a primary side stator 15 is disposed on the ground surface. In the linear induction motor of the three-axis control type magnetic levitation device configured as described above, it is difficult to increase the mounting accuracy of the left and right guide rails 12, 12, and therefore the guide rails 12, 12
The gap between the magnetic bearings 13 and 14 was increased to roughly correspond to the rail accuracy. However, in order to levitate the movable part, it is necessary to apply a large current to the electromagnets 13 and 14,
There is a drawback that the power consumption becomes even larger.

FIG. 5 is a front view showing an example of a two-axis control type magnetic levitation device driven by a linear induction motor. The two-axis control type magnetic levitation device shown in FIG. 5 has a magnetic bearing on the frame 37 so as to face the guide rail 31.
34 is provided. The magnetic bearing 34 has a magnetic pole 35 and a coil 36.
Is wound. The secondary conductor 33 is provided on the lower surface of the frame 37, and the stator 32 is disposed on the ground surface. In this way, in the two-axis control type magnetic levitation device, since the rolling direction is uncontrolled, when the movable part tilts with respect to the guide rail 31, the secondary conductor 33 comes into contact with the primary side stator 32. The magnetic levitation cannot be obtained in a completely non-contact manner.

Therefore, a main object of the present invention is to provide a magnetic levitation device that can perform magnetic levitation in a completely non-contact manner even if it is a biaxial control type.

[Means for Solving the Problems] In the present invention, a magnetic bearing made of an electrode stone is provided on the upper surface of a movable portion facing a rail, and the surface of the end of the shaft core of the electromagnet is a curved surface and is installed on the ground. In a two-axis control type magnetic levitation device driven by a linear induction motor composed of a stator and a secondary conductor arranged on the lower surface of the movable part facing the stator, the surface of the stator or the secondary conductor Is formed to have a curved surface with a radius substantially equal to the distance between the center of gravity of the movable portion and the air gap of the linear induction motor.

[Operation] In the magnetic levitation device according to the present invention, since the surface of the secondary conductor or the stator is formed to have a curved surface, the secondary conductor functions as the stator even if the movable portion is inclined with respect to the rail. The risk of contact can be eliminated, and magnetic levitation can be performed completely without contact.

[Embodiment] FIG. 1 is a front view showing an embodiment of the present invention. The two-axis control type magnetic levitation device shown in FIG. 1 is constructed in the same manner as in FIG. 5 described above except for the following points. That is, the secondary conductor 38 attached to the lower surface of the frame 37
Is formed so as to have a curved surface having a radius R approximately equal to the distance between the center of gravity G of the apparatus and the air gap between the primary side stator 32 and the secondary side conductor 38 which form the linear induction motor. In this way, the radius R is
By forming the curved surface of the
There is no possibility of collision even if it enters into the primary side stator 32 fixed to the ground while rolling around.
Further, the suction force generated between the primary side stator 32 and the secondary side conductor 38 also serves as a restoring force for the rolling, so that the levitation device can be stably driven.

Note that, as shown in FIG. 2, it is conceivable that the secondary side conductor 33 is made flat and the primary side stator 39 is formed with a curved surface having the radius R described above. Even if the collision between the secondary stator 39 and the secondary conductor 33 can be avoided,
Restoration against rolling cannot be expected.

[Advantage of the Invention] As described above, according to the present invention, the surface of the stator or the secondary-side conductor has a radius of curvature substantially equal to the distance between the center of gravity of the movable part and the air gap of the linear induction motor. Therefore, even if the movable portion is inclined with respect to the rail, the secondary-side conductor does not collide with the primary-side stator. Further, since the suction force generated between the primary side stator and the secondary side conductor becomes the restoring force for the rolling, the levitation device can be stably driven.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention. FIG. 2 is a diagram showing an example in which a curved surface is formed on the primary side stator of a two-axis control type magnetic levitation device driven by a linear induction motor. FIG. 3 is a front view showing an example of a 5-axis control type magnetic levitation device driven by a linear induction motor. FIG. 4 is a front view showing an example of a three-axis control type magnetic levitation device driven by a linear induction motor. FIG. 5 is a front view showing an example of a two-axis control type magnetic levitation device driven by a linear induction motor. In the figure, 31 is a guide rail, 32 is a primary side stator, 34 is an electromagnet, 35 is a magnetic pole, 36 is a coil, 37 is a frame, and 38 is 2
The next conductor is shown.

Claims (1)

[Scope of utility model registration request] 1. A stator mounted on the ground, wherein a magnetic bearing made of an electromagnet is provided on the upper surface of a movable portion facing the rail, and the surface of the end of the shaft core of the electromagnet is a curved surface. Driven by a linear induction motor composed of a secondary conductor arranged on the lower surface of the movable portion so as to face
In the axial control type magnetic levitation device, the surface of the stator or the secondary conductor is formed to have a curved surface with a radius substantially equal to the distance between the center of gravity of the movable portion and the air gap of the linear induction motor. Characteristic magnetic levitation device.