JPS60263725A - Magnetic bearing device - Google Patents

Abstract

PURPOSE:To uniformize magnetic flux density of a gap and to prevent the occurrence of contact with a float body and an increase in the current of an electromagnet, by a method wherein the magneti a magnetic attraction force in the float body are inclined depending upon inclination of the float body. CONSTITUTION:A magnetic bearing device 9 is formed such that magnetic poles 11a, 11b, 12a, and 12b, which are an element, being an electromagnet or combination of the electromagnet and a permanent magnet and generating a magnetic attraction force in a float body, are located outside a float body 10. The bearing device is constituted such that when the float body 10 is rotated around a center 13, the magnetic poles 11a, 11b, 12a, and 12b are respectively inclined by an amount alpha responding to the rotary angle. When the float body 10 is inclined, a magnetic pole 11 is brought into an inclination state, and this uniformizes magnetic flux density between the float body 10 and the magnetic pole 11 when the float body 10 is inclined, resulting in stable motion.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention provides a magnetic bearing that supports a floating object in a completely non-contact manner by magnetic force generated by an electromagnet or a combination of an electromagnet and a permanent magnet, and allows the floating object to be tilted. Regarding equipment.

[Prior art and its problems]

BACKGROUND ART Magnetic bearing devices that can support, rotate, or move a floating object in a non-contact manner using magnetic force are widely applied to high-speed rotating object support devices and high-precision positioning devices. Conventional devices of this kind use an electromagnet or a combination of an electromagnet and a permanent magnet as the element that applies magnetic force to the floating object, and the magnetic pole of this element, which faces the floating object, is
It was installed parallel to the floating body.

FIG. 1 is one of the conventional examples, and shows a sectional view of a magnetic bearing device.゛Element that provides magnetic force composed of an electromagnet or a combination of an electromagnet and a permanent magnet (2a) (zb) (aa)
(ab) is installed outside the floating body (1) and exerts an attractive force in the lateral direction of the floating body to levitate the floating body to a stable position.In this case, the floating body (1) and an element that applies magnetic force (
The gap (5) between 2b) becomes constant, and when the magnetic flux density is uniform and the floating body is in a stable position, the current of the electromagnet becomes small. However, when the floating body is rotated around the center (4) of the floating body (11), the relationship between the positions of the floating body (1) and the element (2) becomes as shown in Figure 2, and the magnetic flux density The distribution of is dense where the gap is small, and the attractive force is proportional to the square of the magnetic flux density, so the floating body (1) is
), or the electromagnetic current of the element on the opposite side becomes enormous.

[Purpose of the invention]

The present invention was devised in order to solve the above-mentioned problems, and it is possible to equalize the magnetic flux density in the gap that occurs when a floating object is tilted, and to avoid contact between the floating objects and an increase in the current of the electromagnet. [Summary of the Invention] The present invention relates to a magnetic bearing device that is capable of tilting a floating object, and particularly relates to a device capable of tilting a floating object.
It is characterized in that the magnetic poles of the magnets or permanent magnets are tilted in accordance with the tilt of the floating body.

〔Effect of the invention〕

By tilting the magnetic poles of the elements that apply an attractive force to the floating body as in the present invention, unnecessary increases in the attractive force due to uneven magnetic flux density that occurs when the floating body is tilted can be avoided, and this attractive force can be avoided. The increase in KA of the electromagnets that occurs with respect to the above can be suppressed to a small value, thereby ensuring stable operation of the floating body.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 8 shows the magnetic poles of the magnetic bearing device according to the present invention and their arrangement. The magnetic 1tl+ receiving device (9) in Fig. 3 is a magnetic pole (Ila) (Ilb) which is an element that applies a magnetic attraction force to the floating body, which is an electromagnet or a combination of an electromagnet and a permanent magnet on the outside of the floating body uO1. 12a) (12b)
is located. When a floating body (1G) is rotated around the center U3, each magnetic pole (lla) (llb) (12g) (12
b) is configured to be inclined.

FIG. 4 shows the positional relationship between the floating body aI and the magnetic pole aυ when the floating body OI is tilted. By tilting the magnetic pole αυ, when the floating body α0) is tilted, the floating body fil
The magnetic flux density between the magnetic pole (11) and the magnetic pole (11) becomes uniform, allowing stable operation. Normally, a magnetic bearing device detects the position of the floating object and controls the current of the electromagnet, so if unnecessary force is generated due to uneven magnetic flux density as shown in Figure 2, the magnetic pole (2) The '@ flow of the magnetic pole located on the opposite side becomes enormous.

By simply tilting the magnetic pole (11) as shown in Figure 4,
The above-mentioned increase in current can be avoided, and stability when the floating body is tilted can be improved.

[Other embodiments of the invention]

Hereinafter, another embodiment of the present invention will be described. FIG. 5 shows another embodiment of the magnetic pole of the magnetic bearing device according to the present invention.

The magnetic bearing device 4 in Fig. 5 has a magnetic pole (
22a) (221)) are arranged. The magnetic pole shape has been devised in consideration of the case where the floating body eυ is rotated around the center eS.

FIG. 6 shows a detailed diagram of the magnetic pole shape. By tapering both sides of the surface of the magnetic pole (22b) facing the floating body (2D), the magnetic flux density can be made uniform when the floating body (2) is tilted, and the instability of controllability caused by tilting the floating body can be made uniform. can be avoided.

The present invention is not limited to the above embodiments, but can be applied to all magnetic poles in a magnetic bearing device when a floating body is tilted, and can exhibit its effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional magnetic bearing device, FIG. 2 is a cross-sectional view of a conventional magnetic pole, FIG. 3 is a cross-sectional view showing the arrangement of magnetic poles of a magnetic bearing device according to the present invention, and FIG. 3 is a detailed view of the magnetic pole portion of FIG. 3, FIG. 5 is a sectional view of another embodiment of the present invention, and FIG. 6 is a detailed view of the magnetic pole portion of FIG. 5. (1)...Floating body, i2J (2a) (2b) (8a) (8b) -
Magnetic poles, i, ll...floating body, (11> (1ia) (llb) (i2a) (i
2b) ・=Magnetic pole. Agent Patent Attorney Rule Yu Yu (and 1 other person) 1st
Figure 2 Figure 4

Claims (1)

[Claims] In a magnetic bearing device that supports a floating body by magnetic force in a non-contact manner and is capable of tilting the floating body, a magnetic pole of an electromagnet or a permanent magnet that provides a magnetic attraction force to the floating body, in accordance with the inclination of the floating body. A magnetic bearing device characterized in that the opposing surface of the floating body is inclined.