KR-20260065264-A - FIXED-BIAS FLUX 3-PHASE MAGNETIC BEARING

KR20260065264AKR 20260065264 AKR20260065264 AKR 20260065264AKR-20260065264-A

Abstract

The present invention relates to a fixed-bias magnetic flux type three-phase magnetic bearing comprising: a rotor positioned in the center; a stator comprising a three-phase connected upper heteropolar electromagnet portion provided on the upper outer circumference of the rotor, a three-phase connected lower heteropolar electromagnet portion provided on the lower outer circumference of the rotor, and a fixed-bias homopolar permanent magnet portion provided between the upper heteropolar electromagnet portion and the lower heteropolar electromagnet portion; and a housing provided in a shape that surrounds the outside of the stator; thereby, the number of elements for driving using three-phase electromagnets can be reduced, power consumption can be reduced, and the rotor can be supported without increasing or decreasing the permanent magnet due to the magnetic flux of the electromagnets.

Inventors

조한욱
노수진
박주홍

Assignees

충남대학교산학협력단

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (6)

A rotor positioned in the center; A stator comprising a three-phase connected upper heteropolar electromagnet section provided on the upper outer circumference of the rotor, a three-phase connected lower heteropolar electromagnet section provided on the lower outer circumference of the rotor, and a fixed-bias homopolar permanent magnet section provided between the upper heteropolar electromagnet section and the lower heteropolar electromagnet section; and A housing provided in a shape that surrounds the outside of the above-mentioned stator; Fixed-bias flux type three-phase magnetic bearing including
In claim 1, The upper heteropolar electromagnet part above is, Upper electromagnet body provided in the shape of a circular ring; An upper magnetic pole formed to protrude from the inner surface of the upper electromagnet body in a central direction, spaced apart from the outer surface of the rotor by a preset distance, and provided in multiples of 3; and An upper electromagnet coil provided to surround the outer surface of the upper stimulus; Fixed-bias flux type three-phase magnetic bearing including
In claim 2, The above lower heteropolar electromagnet part is, Lower electromagnet body provided in the shape of a circular ring; A lower magnetic pole formed to protrude from the inner surface of the lower electromagnet body in a central direction, spaced apart from the outer surface of the rotor by a preset distance, and provided in multiples of 3; and A lower electromagnet coil provided to surround the outer surface of the lower stimulus; Fixed-bias flux type three-phase magnetic bearing including
In claim 3, The above homopolar permanent magnet part is, A permanent magnet provided in a U-shape, wherein the upper and lower portions protrude in the central direction at a predetermined distance from the outer surface of the rotor. Fixed-bias flux type 3-phase magnetic bearing.
In claim 4, The above permanent magnet is, It is provided as a single unit or divided into multiples of 2. Fixed-bias flux type 3-phase magnetic bearing.
In any one of claims 1 to 5, The above fixed-bias flux type three-phase magnetic bearing is, A gap sensor provided respectively on the inner side of the upper part and the inner side of the lower part of the above housing; Fixed-bias flux type 3-phase magnetic bearing including further

Description

Fixed-bias flux 3-phase magnetic bearing The present invention relates to a fixed-bias type three-phase magnetic bearing that can reduce the number of elements for driving using three-phase electromagnets and reduce power consumption, and can support the rotor without increasing or decreasing the permanent magnets due to the electromagnet flux, by providing a stator comprising a three-phase connected upper heteropolar electromagnet part provided on the upper outer circumference of the rotor, a three-phase connected lower heteropolar electromagnet part provided on the lower outer circumference of the rotor, and a fixed-bias homopolar permanent magnet part provided between the upper heteropolar electromagnet part and the lower heteropolar electromagnet part. As is well known, conventional bearings utilize mechanical rolling bearings, which suffer from problems such as noise, dust, and limited lifespan due to mechanical friction caused by contact between the rotor and the bearings. Recently, research on non-contact magnetic bearings has been continuously conducted to address these issues caused by mechanical friction in existing mechanical rolling bearings. These magnetic bearings (MBs) stably support a floating body by increasing or decreasing the magnetic force according to the positional change of the floating body, with two opposing pole surfaces attracting each other. Examples include electromagnet-type magnetic bearings and hybrid magnetic bearings that use both permanent magnets and electromagnets simultaneously. Here, in the case of the electromagnetic type magnetic bearing as shown in Fig. 1, one unipolar converter module (i.e., two IGBTs) is required per electromagnet, and since bias current is continuously applied, there is a problem that power consumption is relatively high. In addition, in the case of a hybrid magnetic bearing as shown in Fig. 2, the magnetic flux of the permanent magnet is used to increase or decrease the magnetic flux of the permanent magnet to control the attractive force, but this has the problem of degrading the magnetic performance of the permanent magnet during long-term operation of the magnetic bearing. As described above, there is a need to develop a magnetic bearing that enables the rotation of a mechanical device without supporting the rotor by mechanical (connected) bearings, supports the rotor using a fixed-bias magnetic flux from a permanent magnet, and generates a controllable force through an electromagnet in the event of a force imbalance. FIGS. 1 and 2 are drawings for explaining a conventional magnetic bearing, and FIG. 3 is a drawing illustrating a fixed-bias magnetic flux type three-phase magnetic bearing according to an embodiment of the present invention, and FIGS. 4 to 13 are drawings for explaining the detailed configuration of a fixed-bias magnetic flux type three-phase magnetic bearing according to an embodiment of the present invention. The advantages and features of the embodiments of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. In describing the embodiments of the present invention, specific descriptions of known functions or configurations will be omitted if it is determined that such detailed descriptions could unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions in the embodiments of the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 3 is a drawing illustrating a fixed-bias type three-phase magnetic bearing according to an embodiment of the present invention, and FIGS. 4 to 13 are drawings for explaining the detailed configuration of a fixed-bias type three-phase magnetic bearing according to an embodiment of the present invention. Referring to FIGS. 3 to 15, a fixed-bias magnetic flux type three-phase magnetic bearing according to an embodiment of the present invention may include a rotor (100), a stator (200), a housing (300), an air gap sensor (400), etc. The rotor (100) is positioned in the center and, for example, is made of a magnet, magnetized metal, etc., and can rotate within the bearin