CN104235181A - Permanent magnet biased magnetic bearing device with three degree of freedom - Google Patents
Permanent magnet biased magnetic bearing device with three degree of freedom Download PDFInfo
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- CN104235181A CN104235181A CN201310237049.4A CN201310237049A CN104235181A CN 104235181 A CN104235181 A CN 104235181A CN 201310237049 A CN201310237049 A CN 201310237049A CN 104235181 A CN104235181 A CN 104235181A
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Abstract
The invention discloses a permanent magnet biased magnetic bearing device with three degree of freedom. The device includes a rotor, a stator, an external magnetic pole iron core, an axial control coil and a radial control coil. The circumferential direction of the rotor is provided with a stator, radial air gap exists between the rotor and the stator, the stator is provided with a radial control coil, the circumferential direction of the stator is provided with a permanent magnet ring body, the external magnetic pole iron core comprises an annular cavity, the inner side of the annular cavity as a circular opening, the permanent magnetic ring body, stator and radial control coil pass through the annular opening and are located in the annular cavity, a portion of the rotor extends into the annular opening, and axial air gap exists between the rotor and the annular opening. The permanent magnet biased magnetic bearing device with three degree of freedom provided by the present invention can realize independent control of radial and axial magnetic suspension load in the neighborhood of the equilibrium position.
Description
Technical field
The present invention relates to technical field of bearings, be specifically related to a kind of permanent magnet bias Three Degree Of Freedom electromagnetic bearing device.
Background technique
Traditional ACTIVE CONTROL active magnetic bearing system generally adopts two radial magnetic bearings and an axial electromagnetic bearings to control 5 degrees of freedom of rotating shaft, makes high speed rotor stable suspersion.If radial direction magnetic bearing and axial magnetic bearing to be integrated into a bearing, magnetic bearing so in 5DOF active magnet bearing systems can be kept to two from three, eliminate an independently axial magnetic bearing, whole system structure and control are simplified, reduce system dimension and axial length, thus improve rotor critical speed of rotation, improve dynamic performance.At present, taper active magnetic bearings can realize axially and radial suspension simultaneously, but this magnetic bearing is different pole structure, eddy current loss is large, need a coil simultaneously for axis and radial direction provide biased magnetic flux and control magnetic flux, and the low magnetic suspension force of rotor-position has very strong non-linear effects, make that machining and control overflow are very complicated, loaded capability is restricted.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, a kind of permanent magnet bias Three Degree Of Freedom electromagnetic bearing device is provided, the low magnetic suspension force of rotor-position can be solved very well and have very strong non-linear effects, make the problem that machining and control overflow are very complicated, loaded capability is restricted.
Consider the problems referred to above of prior art, according to an aspect of the present invention, for solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of permanent magnet bias Three Degree Of Freedom electromagnetic bearing device, comprise rotor, stator, external magnetic poles iron core, axial control coil and radial control coil, described rotor be circumferentially provided with stator, radial air gap is there is between described rotor and stator, described stator is provided with radial control coil, described stator be circumferentially provided with permanent magnetism ring body; Described external magnetic poles iron core comprises a ring-shaped cavity, the inner side of this ring-shaped cavity is an annular opening, described permanent magnetism ring body, stator and radial control coil are all positioned at this ring-shaped cavity by this annular opening, a part for described rotor stretches into described annular opening, there is axial air-gap between described rotor and described annular opening, described axial control coil is positioned at the ring-shaped cavity of described external magnetic poles iron core.
In order to realize the present invention better, further technological scheme is:
According to one embodiment of present invention, described axial control coil is close to the inwall of the ring-shaped cavity of described external magnetic poles iron core.
According to one embodiment of present invention, also comprise radial-direction position sensor, described radial-direction position sensor is positioned on described external magnetic poles iron core.
According to one embodiment of present invention, also comprise signal amplifier, described signal amplifier is connected with described radial-direction position sensor.
According to one embodiment of present invention, also comprise wave filter, described wave filter is connected with described signal amplifier.
According to one embodiment of present invention, also comprise controller, described controller is connected with described wave filter.
According to one embodiment of present invention, also comprise power amplifier, described power amplifier is connected with described controller and stator respectively.
The present invention can also be:
According to one embodiment of present invention, described rotor is for being arranged on after in rotating shaft, and one end of described rotating shaft is provided with axial position sensor, and described axial position sensor is connected with described signal amplifier.
Compared with prior art, one of beneficial effect of the present invention is:
Permanent magnet bias Three Degree Of Freedom electromagnetic bearing device of the present invention, radial air gap that a permanent magnetism ring body is magnetic bearing and axial air-gap is adopted to provide biased magnetic flux, the independence that can realize radial and axial magnetic suspension load near equilibrium position controls, and is highly suitable for the high-speed applications such as flywheel energy storage, air condition compressor, turbomolecular pump.Experimental system demonstrates the working mechanism of this magnetic bearing and excellent Decoupling Characteristics.
Accompanying drawing explanation
In order to clearer explanation present specification embodiment or technological scheme of the prior art, below the accompanying drawing used required in the description to embodiment or prior art is briefly described, apparently, the accompanying drawing that the following describes is only the reference to some embodiments in present specification, for those skilled in the art, when not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 shows the structural representation of magnetic bias Three Degree Of Freedom electromagnetic bearing according to an embodiment of the invention.
Fig. 2 shows the structural representation of magnetic bias Three Degree Of Freedom electromagnetic bearing in accordance with another embodiment of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
Fig. 1 shows the structural representation of magnetic bias Three Degree Of Freedom electromagnetic bearing according to an embodiment of the invention.A kind of permanent magnet bias Three Degree Of Freedom electromagnetic bearing device as shown in Figure 1, comprise rotor 101, stator 102, external magnetic poles iron core 103, axial control coil 104 and radial control coil 105, described rotor 101 be circumferentially provided with stator 102, radial air gap 106 is there is between described rotor 101 and stator 102, described stator 102 is provided with radial control coil 105, described stator 102 be circumferentially provided with permanent magnetism ring body 107; Described external magnetic poles iron core 103 comprises a ring-shaped cavity 108, the inner side of this ring-shaped cavity 108 is an annular opening 109, described permanent magnetism ring body 107, stator 102 and radial control coil 105 are all positioned at this ring-shaped cavity 108 by this annular opening 109, a part for described rotor 101 stretches into described annular opening 109, there is axial air-gap 110 between described rotor 101 and described annular opening 109, described axial control coil 104 is positioned at the ring-shaped cavity 108 of described external magnetic poles iron core 103.
Described axial control coil 104 is close to the inwall of the ring-shaped cavity 108 of described external magnetic poles iron core 103.
Embodiment 2
Fig. 2 shows the structural representation of magnetic bias Three Degree Of Freedom electromagnetic bearing in accordance with another embodiment of the present invention.A kind of permanent magnet bias Three Degree Of Freedom electromagnetic bearing device as shown in Figure 2, also comprise radial-direction position sensor 111, described radial-direction position sensor 111 is positioned on described external magnetic poles iron core.
Also comprise signal amplifier 112, described signal amplifier 112 is connected with described radial-direction position sensor 111.
Also comprise wave filter 113, described wave filter 113 is connected with described signal amplifier 112.
Also comprise controller 114, described controller 114 is connected with described wave filter 113.
Also comprise power amplifier 115, described power amplifier 115 is connected with described controller 114 and stator respectively.
Described rotor is used for being arranged on after in rotating shaft 116, and one end of described rotating shaft 116 is provided with axial position sensor 117, and described axial position sensor 117 is connected with described signal amplifier 112.
Embodiment 3
The Three Degree Of Freedom electromagnetic bearing of the present embodiment utilizes the permanent magnetism ring body (NdFeB material) of a radial magnetizing to produce the bias magnetic field of axis and radial air gap, adopt unipolarity structure to make bias magnetic field be all single polarity in magnet radial poles, axial pole is also all single polarity (its polarity is contrary with magnet radial poles).Unipolarity structure makes bias magnetic all cross radial air gap and enters (going out) rotor, goes out (entering) rotor by axial air-gap simultaneously, eliminates magnetic polarity change when rotor rotates in radial air gap, thus reduces the hysteresis loss of rotor when High Rotation Speed.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, identical similar portion cross-reference between each embodiment.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and mode of execution, these amendments and mode of execution will drop within spirit disclosed in the present application and spirit.
Claims (8)
1. a permanent magnet bias Three Degree Of Freedom electromagnetic bearing device, it is characterized in that, comprise rotor, stator, external magnetic poles iron core, axial control coil and radial control coil, described rotor be circumferentially provided with stator, radial air gap is there is between described rotor and stator, described stator is provided with radial control coil, described stator be circumferentially provided with permanent magnetism ring body; Described external magnetic poles iron core comprises a ring-shaped cavity, the inner side of this ring-shaped cavity is an annular opening, described permanent magnetism ring body, stator and radial control coil are all positioned at this ring-shaped cavity by this annular opening, a part for described rotor stretches into described annular opening, there is axial air-gap between described rotor and described annular opening, described axial control coil is positioned at the ring-shaped cavity of described external magnetic poles iron core.
2. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 1, it is characterized in that, described axial control coil is close to the inwall of the ring-shaped cavity of described external magnetic poles iron core.
3. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 1, it is characterized in that, also comprise radial-direction position sensor, described radial-direction position sensor is positioned on described external magnetic poles iron core.
4. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 3, it is characterized in that, also comprise signal amplifier, described signal amplifier is connected with described radial-direction position sensor.
5. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 4, it is characterized in that, also comprise wave filter, described wave filter is connected with described signal amplifier.
6. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 5, it is characterized in that, also comprise controller, described controller is connected with described wave filter.
7. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 6, it is characterized in that, also comprise power amplifier, described power amplifier is connected with described controller and stator respectively.
8. permanent magnet bias Three Degree Of Freedom electromagnetic bearing device according to claim 4, it is characterized in that, described rotor is for being arranged on after in rotating shaft, and one end of described rotating shaft is provided with axial position sensor, and described axial position sensor is connected with described signal amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310237049.4A CN104235181A (en) | 2013-06-17 | 2013-06-17 | Permanent magnet biased magnetic bearing device with three degree of freedom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310237049.4A CN104235181A (en) | 2013-06-17 | 2013-06-17 | Permanent magnet biased magnetic bearing device with three degree of freedom |
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| Publication Number | Publication Date |
|---|---|
| CN104235181A true CN104235181A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310237049.4A Pending CN104235181A (en) | 2013-06-17 | 2013-06-17 | Permanent magnet biased magnetic bearing device with three degree of freedom |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533945A (en) * | 2015-01-05 | 2015-04-22 | 山东大学 | Structure for achieving five-freedom-degree suspension of rotor through axial mixed magnetic bearings |
| CN108779800A (en) * | 2016-03-18 | 2018-11-09 | 诺沃皮尼奥内技术股份有限公司 | Magnetic bearing for turbomachinery |
| CN111313600A (en) * | 2020-03-09 | 2020-06-19 | 贝肯新能源(天津)有限公司 | High-capacity flywheel energy storage device |
-
2013
- 2013-06-17 CN CN201310237049.4A patent/CN104235181A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533945A (en) * | 2015-01-05 | 2015-04-22 | 山东大学 | Structure for achieving five-freedom-degree suspension of rotor through axial mixed magnetic bearings |
| CN108779800A (en) * | 2016-03-18 | 2018-11-09 | 诺沃皮尼奥内技术股份有限公司 | Magnetic bearing for turbomachinery |
| CN111313600A (en) * | 2020-03-09 | 2020-06-19 | 贝肯新能源(天津)有限公司 | High-capacity flywheel energy storage device |
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| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141224 |