JP3145381B2 - Magnetic levitation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic levitation device, and more particularly, to a magnetic levitation device in which a displacement sensor and an electromagnet are arranged on a traveling rail and a movable element is caused to float and travel. About.

[Prior Art] FIG. 3 is an external perspective view showing a main part of an example of a conventional magnetic levitation device. With reference to FIG. 3, a conventional magnetic levitation device will be briefly described. The mover 2 is provided so as to travel along the rail. Although not shown, permanent magnets are embedded in the lower surface of the mover 2, and a plurality of permanent magnets 4 are embedded on the transport track 3 so as to face the permanent magnets. The mover 2 floats due to the repulsion between the permanent magnets 4 and the permanent magnets 4 embedded in the lower surface thereof. Further, displacement sensors 5a and 5b are arranged on the mover 2, and a gap between the mover 2 and the rail 1 is detected.
Further, a plurality of electromagnets 6 are arranged on the stator side along the rail 1, and the electromagnets 6 are switched stepwise according to the gap detection output of the displacement sensors 5a and 5b, and the mover 2 is moved in the traveling direction. Driven and guided.

[Problem to be Solved by the Invention] As described above, the movable element 2 can be driven in the traveling direction by switching the electromagnet 6 on the stator side in a step-like manner. However, on the other hand, the switching of the electromagnet 6 in a step-like manner causes a ripple in the magnetic attracting force in the guide direction, causing a problem that the mover 2 vibrates. To alleviate this, it is necessary to provide a large number of electromagnets 6 on the rail 1.

Further, since the displacement sensor coils 5a and 5b are arranged on the mover 2, a means for transmitting detection signals of the displacement sensor coils 5a and 5b to the stator side is required. It is necessary to provide a wireless device or an optical transmission device on the mover 2.

SUMMARY OF THE INVENTION Accordingly, a main object of the present invention is to provide a magnetic levitation device in which a movable element can be smoothly driven to travel and a displacement sensor is arranged on a stator side.

Means for Solving the Problems According to the present invention, a long displacement sensor coil and a long electromagnet are arranged side by side along a plurality of rails on the stator side, and the rail and the mover are moved by each displacement sensor coil. In the magnetic levitation device that measures the distance between the coils and controls each electromagnet based on the output of each displacement sensor coil and adjusts the guide direction or the levitation direction position of the mover, it is driven corresponding to each displacement sensor coil. The length of the electromagnet in the rail direction is an integral multiple of the length of the displacement sensor coil, and both ends of the plurality of displacement sensor coils in the rail direction and both ends of the electromagnet coincide with each other in the rail direction.

[Operation] In the magnetic levitation device according to the present invention, the length of the electromagnet in the rail direction is set to an integral multiple of the length of the displacement sensor coil, and both ends of the plurality of displacement sensor coils in the rail direction and both ends of the electromagnet coincide with the rail direction. As a result, the timing of switching between the displacement sensor coil and the electromagnet can be easily synchronized, and the mover can run smoothly.

[Embodiment of the Invention] FIG. 1 is an external perspective view of an embodiment of the present invention, and FIG. 2 is a diagram showing an arrangement of a displacement sensor coil and an electromagnet.

In this embodiment, as shown in FIG.
6d and the electromagnets 7a and 7b are arranged on the stator side. As the displacement sensors 6a to 6d, for example, an eddy current magnetic sensor or a reluctance sensor is used, and these detection coils are formed to have a long shape, and a plurality of these coils are arranged on a rail (not shown). The mover 2 facing the displacement sensors 6a to 6d
A sensor target 8 is provided on a side surface of the sensor target 8. And
With the movement of the mover 2, the displacement sensors 6a to 6d are switched, and the gap displacement between the sensor target 8 of the mover 2 and the rail is detected. At this time, in order to continuously obtain the outputs of the displacement sensors 6a to 6d, a displacement signal may be obtained from the average value of the output of each sensor.

On the other hand, the electromagnets 7a and 7b are also formed in a long shape like the displacement sensors 6a to 6d, and a plurality of them are arranged on the rail. A yoke 9 shorter than the rail-direction length of the electromagnets 7a, 7b is provided on the side surface of the mover 2 facing the electromagnets 7a, 7b so that a magnetic attraction force always acts on a fixed position on the mover 2. You. Then, the electromagnets 7a and 7b are sequentially switched in response to the detection outputs of the displacement sensors 6a to 6d, and the position of the mover 2 is controlled. At this time, it is necessary to synchronize the switching timing between the displacement sensors 6a to 6d and the electromagnets 7a and 7b.

Therefore, as shown in FIG. 2, the length in the rail direction of each electromagnet 7 corresponding to the displacement sensor 6 is set to an integral multiple of the length of each displacement sensor, and both end faces are made to coincide with each other. And the switching timing can be easily synchronized, and the mover 2 can run smoothly.

[Effects of the Invention] As described above, according to the present invention, a plurality of long displacement sensor coils and a plurality of long electromagnets are arranged on the stator side along the rail direction to correspond to each displacement sensor coil. The length of the electromagnet driven in the rail direction is set to an integral multiple of the length of the displacement sensor coil, and both ends of the electromagnet at both ends of the plurality of displacement sensor coils in the rail direction are aligned with the rail direction. Synchronization of the switching timing between the sensor coil and the electromagnet is facilitated, and the mover can run smoothly.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a main part of one embodiment of the present invention. FIG. 2 is a diagram showing an arrangement of a displacement sensor and an electromagnet. FIG. 3 is an external perspective view showing a main part of an example of a conventional magnetic levitation device. In the figure, 2 is a mover, 6, 6a to 6d are displacement sensors, 7, 7
a and 7b are electromagnets, 8 is a sensor target, and 9 is a yoke.

Claims (1)

(57) [Claims] An elongated displacement sensor coil and an elongated electromagnet are arranged side by side along a plurality of rails on the stator side, and the distance between the rail and the mover is determined by each of the displacement sensor coils. A magnetic levitation device that measures and controls each of the electromagnets based on the output of each of the displacement sensor coils to adjust the guide direction or the levitation direction position of the mover. The magnetic levitation device is driven corresponding to each of the displacement sensor coils. The length in the rail direction of the electromagnet is an integral multiple of the length of the displacement sensor coil, and both ends of the plurality of displacement sensor coils in the rail direction and both ends of the electromagnet are made to coincide with the rail direction, Magnetic levitation device.