KR20170006634A - Thrust Magnetic Bearing Integrated with Radial Displacement Sensors - Google Patents

Thrust Magnetic Bearing Integrated with Radial Displacement Sensors Download PDF

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Publication number
KR20170006634A
KR20170006634A KR1020150097563A KR20150097563A KR20170006634A KR 20170006634 A KR20170006634 A KR 20170006634A KR 1020150097563 A KR1020150097563 A KR 1020150097563A KR 20150097563 A KR20150097563 A KR 20150097563A KR 20170006634 A KR20170006634 A KR 20170006634A
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KR
South Korea
Prior art keywords
sensor
radial
magnetic bearing
thrust magnetic
present
Prior art date
Application number
KR1020150097563A
Other languages
Korean (ko)
Inventor
박철훈
윤의수
박준영
함상용
이성휘
Original Assignee
한국기계연구원
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Application filed by 한국기계연구원 filed Critical 한국기계연구원
Priority to KR1020150097563A priority Critical patent/KR20170006634A/en
Publication of KR20170006634A publication Critical patent/KR20170006634A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/047—Details of housings; Mounting of active magnetic bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0474—Active magnetic bearings for rotary movement
    • F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial magnetic bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2233/00—Monitoring condition, e.g. temperature, load, vibration

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

The present invention relates to a thrust magnetic bearing integrated with a radial displacement sensor and, more specifically, relates to a magnetic bearing for floating a plate-shaped floating body protruded to the vertical direction of a rotational shaft by a ring-shaped electromagnetic unit for covering the rotational shaft. The thrust magnetic bearing integrated with a radial displacement sensor is integrated by being formed with a sensor fixing unit to measure the radial displacement vibration of the rotational shaft inside the electromagnetic unit.

Description

{Thrust Magnetic Bearing Integrated with Radial Displacement Sensors}

The present invention relates to a radial sensor-integrated thrust magnetic bearing, and more particularly, to a magnetic bearing for lifting a plate-shaped floating body protruding in a direction perpendicular to the rotation axis by a ring-shaped electromagnetic portion surrounding the rotation axis, To an integrated radial sensor type thrust magnetic bearing in which a sensor fixing portion for measuring radial vibration of a rotating shaft is formed in an integrated part of an electromagnetic portion.

Conventional conventional bearings suffer from friction due to contact, and magnetic bearings for minimizing friction have been widely used in various fields in recent years.

As described in Korean Patent Laid-Open Publication No. 2009-0070178 ("Cylindrical radial displacement measurement system of magnetic bearing using electrostatic capacity and its method for judging whether there is a failure ", Jul.07, 2009), the magnetic bearing has a strong A magnetic magnet or an electromagnet is disposed, and the floating body formed in the direction perpendicular to the rotation axis is floated by magnetic levitation to serve as a bearing.

In this case, the magnetic bearing needs to measure the radial vibration of the rotating body in order to prevent contact between the floating body and the magnet portion, or to control the operation of the bearing precisely, and a method of measuring the radial vibration of the magnetic bearing is shown in FIG.

As shown in FIG. 1, in order to measure the radial vibration of the rotating body, a radial sensor must be installed, which requires a separate space for vibration detection of the rotating body.

That is, in order to attach the radial sensor for radial vibration measurement to the rotating body, a separate space is required, which not only lengthens the length of the rotating body, but also makes the volume of the whole system unnecessary There is an increasing problem.

In order to rotate the rotor of the high-speed rotor in a stable manner, it is desirable to design the critical speed due to the bending mode of the rotor as high as possible from the operating speed. For this purpose, it is desirable to design the rotor as short as possible.

However, in the magnetic bearing to which the displacement measurement method of the rotating body shown in FIG. 1 is applied, there is a problem that the condition for stable rotor rotation described above can not be satisfied.

Korean Patent Publication No. 2009-0070178 ("Cylindrical radial displacement measurement system of magnetic bearing using electrostatic capacity and method for judging whether there is a failure," 2009.07.01.) Korean Registered Patent No. 1444139 ("Combined Magnetic Bearing Combined with Sensor and Auxiliary Bearing ", 2014.09.26.)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a magnetic bearing in which a sensor fixing part for measuring radial vibration of a rotating body is formed and integrated into an electromagnetic part of a magnetic bearing, And to provide a radial sensor-integrated thrust magnetic bearing capable of minimizing the volume of the entire rotating system including the rotating body.

A radial sensor-integrated thrust magnetic bearing according to the present invention comprises a rotating body including a rotating shaft and a plate-shaped floating body protruding in a direction perpendicular to the rotating shaft by a ring-shaped electromagnetic coil surrounding the rotating shaft, And a sensor fixing part formed to surround the floating body in the circumferential direction inside the electromagnetic part, wherein the sensor fixing part is formed so that one end thereof is horizontally communicated with the floating body And a radial sensor provided in the sensor for measuring the radial vibration of the lifting body.

Particularly, the sensor is formed of four pieces, and is formed at intervals of 90 degrees in the circumferential direction of the sensor fixing part.

In addition, at least two radial sensors are provided in the middle of the sensor at intervals of 90 degrees.

The sensor fixing unit may further include a stator for fixing the radial sensor to the sensor.

A radial sensor integrated type magnetic thrust bearing according to the present invention is a magnetic bearing for lifting a plate-shaped floating body protruding in a direction perpendicular to the rotation axis by a ring-shaped electromagnetic portion surrounding a rotation axis, There is an advantage that it is unnecessary to fabricate an additional fixing structure for attaching the radial direction sensor to the thrust magnetic bearing or the rotating shaft by integrally forming the sensor fixing parts for measuring the displacement.

Particularly, the radial sensor integrated type thrust magnetic bearing according to the present invention does not need to fabricate an additional fixing structure for attaching the radial direction sensor, so that it is possible to minimize the length of the rotating body and the volume of the entire rotating system including the rotating body .

Further, the radial direction sensor integrated magnetic bearing according to the present invention is formed such that the radial direction sensor is integrated into the inside of the electromagnetic portion, so that the structure of the system is simplified, so that it is easy to manufacture and assemble the rotating body.

In addition, since the radial sensor integrated type thrust magnetic bearing according to the present invention can reduce the length of the rotating body, there is an advantage that the dangerous speed due to the bending mode can be increased.

1 shows a method for measuring the radial displacement of a conventional magnetic bearing.
2 is a cross-sectional view of a radial sensor integral thrust magnetic bearing in accordance with the present invention;
3 shows a radial sensor integral thrust magnetic bearing according to the present invention.
4 is another view of a radial sensor integrated thrust magnetic bearing according to the present invention.
5 is another cross-sectional view of a radial sensor integral thrust magnetic bearing according to the present invention.
FIG. 6 is a view showing a rotor system to which a radial sensor-integrated thrust magnetic bearing according to the present invention is applied; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a radial sensor integrated type magnetic bearing according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional or dictionary sense, and the inventor should appropriately define the concept of the term to describe its invention in the best possible way The present invention should be construed in accordance with the spirit and concept of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 2 is a sectional view of a radial sensor integrated thrust magnetic bearing according to the present invention, FIG. 3 is a view showing a radial sensor integrated type magnetic thrust bearing according to the present invention, and FIG. FIG. 5 is a further cross-sectional view of a radial sensor integrated thrust magnetic bearing according to the present invention, and FIG. 6 is a cross-sectional view of a radial sensor integral throw- FIG. 1 is a view showing a rotating system to which a magnetic bearing is applied.

3 to 5, the radial sensor integrated type thrust magnetic bearing according to the present invention includes a rotating body 100 including a rotating shaft 110 and a ring-shaped electromagnetic coil (not shown) surrounding the rotating shaft 110 The present invention relates to a thrust magnetic bearing for lifting a plate-shaped floating body 120 protruding in the vertical direction of the rotating shaft 110 by a rotating shaft 210 of the rotating body 110 to support the rotating body 100, A radial sensor 223 capable of measuring vibrations is provided inside the electromagnetic portion 210 so that a radial sensor for measuring the radial vibration of the rotary shaft 110 including the thrust magnetic bearing and the floating body 120 (223) are integrally formed.

In this case, the radial direction described above is a direction perpendicular to the longitudinal direction (axis) of the rotary shaft 110, and the radial vibration of the floating body 120 is perpendicular to the longitudinal direction of the rotary shaft 110 Refers to vibration caused by rotation.

The electromagnet 220 may include an electromagnet coil 211 for floating the levitator 120 or a permanent magnet 212 provided together with the electromagnet coil 211.

The electromagnet coil 211 generates a magnetic flux to float the floating body 120 when the electric power is supplied thereto, so that the floating body 120 floats.

The permanent magnet 212 may also generate a magnetic flux for floating the floating body 120 to float the floating body 120.

It should be noted that the electromagnet coil 211 and the permanent magnet 212 for lifting the floating body 120 in the thrust magnetic bearing are well known techniques and will not be described in detail, The number of the coils 211 and the number of the permanent magnets 212 is also not limited.

The radial sensor integrated type thrust magnetic bearing according to the present invention may further include a radial sensor integrated type thrust magnetic bearing according to the present invention in which the above- And a sensor fixing part 220 formed to surround the sensor fixing part 220.

The sensor fixing part 220 includes a sensor core 221 whose one end is connected to the floating body 120 so as to be horizontally connected to the sensor fixing part 220. The sensor core 221 includes the floating body 120, The radial vibration of the floating body 120 can be measured by providing the radial direction sensor 223 for measuring the radial vibration of the floating body 120. [

The sensor fixing part 220 is preferably formed in a ring shape so as to surround the circumferential outer circumferential surface in order to measure radial vibration of the floating body 120, but the present invention is not limited thereto.

At this time, the sensor fixing part 220 may further include a stator formed to fix the radial direction sensor 223 to prevent the radial direction sensor 223 from being detached from the sensor middle 221.

The material of the stator is preferably rubber or synthetic resin. However, it is needless to say that the material of the stator is not limited as long as the radial sensor 223 is prevented from coming off and there is no possibility of breakage.

The electromagnetic coil 210 is connected to the other end of the sensor 221 in order to communicate with the outside in order to receive information of the radial sensor 223 provided in the sensor center 221 of the sensor fixing unit 220 The sensor module may further include a receiving center 222 formed at an upper portion or a lower portion of the electromagnetic portion 210 so as to communicate with the sensor middle portion 221 in a vertical direction.

That is, the sensor 221 is formed so that one end thereof is horizontally communicated with the lifting body 120, so that the radial direction sensor 223 is provided to measure the radial vibration of the lifting body 120 And the receiving center 222 is formed to communicate with the upper or lower portion of the electromagnetic part 210 to receive the vibration information measured by the radial direction sensor 223.

However, it is needless to say that the shape or position of the receiving end 222 is not limited, and various embodiments are possible as long as it is possible to receive information from the radial direction sensor 223 smoothly.

The sensor core 221 of the radial sensor integrated type thrust magnetic bearing according to the present invention is formed of four sensors, and the sensor fixing unit 220 is formed at intervals of 90 degrees in the circumferential direction.

In addition, at least two radial sensors 223 provided in the sensor 221 are provided in the sensor 221 adjacent to each other at an interval of 90 degrees.

The sensor fixing part 220 is formed by being in contact with the permanent magnet 212 inside the electromagnetic part 210 so that the sensor fixing part 220 serves as a movement path of the magnetic flux generated in the permanent magnet 212 .

Therefore, it is preferable that the sensor heights 221 of the sensor fixing part 220 are uniformly arranged at intervals of 90 degrees so that the magnetic flux generated from the permanent magnets 212 is uniformly moved.

In addition, the radial direction sensors 223 provided in the sensor main body 221 are disposed adjacent to each other at intervals of 90 degrees, thereby measuring radial vibrations (displacements) of arbitrary X and Y axes.

In other words, the radial sensor integrated type thrust magnetic bearing according to the present invention is characterized in that, in order to measure the radial echo vibration in the X-axis and Y-axis directions, the sensor center 221 and the radial sensor 223 included therein And the sensor core 221 is formed at four intervals of 90 degrees in order to uniformly move the magnetic fluxes generated by the permanent magnets 212.

This can reduce the measurement error of the radial vibration of the floating body 120 formed perpendicularly to the axis of the rotation shaft 110 as well as the magnetic flux in the electromagnetic coil 210 to move uniformly.

6 is a view showing a rotating body 100 to which a radial sensor-integrated thrust magnetic bearing according to the present invention is applied.

6, by providing the radial sensor integrated type magnetic bearing according to the present invention in the rotating body 100, a separate space is provided on the rotating shaft 110 for providing the radial sensor 223 There is an advantage not required.

That is, the rotating body 100 can be formed to have a shorter length than the rotating body having the conventional thrust magnetic bearing shown in FIG. 1, and the volume of the rotating system including the rotating body 100 is also unnecessary Can be prevented.

Since the length of the rotating body 100 can be designed to be as short as possible, a dangerous speed due to the bending mode can be designed to be high and the rotation of the rotating system can be performed stably.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various modifications and variations are possible within the scope of the appended claims.

200: Radial sensor integrated thrust magnetic bearing
210: electromagnet
211: Electromagnet coil
212: permanent magnet
220: sensor fixing section
221: Sensor studying
222: Receiving study
223: Radial sensor
100: rotating body
110:
120:
130: Impeller

Claims (4)

A thrust magnetic bearing for supporting the rotating body by floating a plate-like floating body protruding in a direction perpendicular to the rotating shaft by a ring-shaped electromagnetic portion surrounding the rotating shaft,
And a sensor fixing unit configured to surround the floating body inside the electromagnetic portion in the circumferential direction,
The sensor fixing part
And a radial sensor provided in the middle of the sensor for measuring a radial vibration of the levitator, the radial sensor comprising: Magnetic bearing.
The method according to claim 1,
Among the sensors,
Wherein the sensor fixing portion is formed at an interval of 90 degrees in the circumferential direction of the sensor fixing portion.
3. The method of claim 2,
The radial sensor
Wherein at least two of the at least two sensors are provided in the middle of the sensor at intervals of 90 degrees.
The method according to claim 1,
The sensor fixing part
Further comprising a stator for fixing said radial sensor to said sensor core. ≪ RTI ID = 0.0 > 11. < / RTI & gt ;
KR1020150097563A 2015-07-09 2015-07-09 Thrust Magnetic Bearing Integrated with Radial Displacement Sensors KR20170006634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150097563A KR20170006634A (en) 2015-07-09 2015-07-09 Thrust Magnetic Bearing Integrated with Radial Displacement Sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150097563A KR20170006634A (en) 2015-07-09 2015-07-09 Thrust Magnetic Bearing Integrated with Radial Displacement Sensors

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KR20170006634A true KR20170006634A (en) 2017-01-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109763994A (en) * 2019-02-21 2019-05-17 珠海格力电器股份有限公司 Magnetic suspension bearing and magnetic suspension centrifugal compressor, air conditioner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090070178A (en) 2007-12-27 2009-07-01 한국전기연구원 Capacitance measuring displacement sensor structure and it's transducer for radial active magnetic bearing
KR101444139B1 (en) 2013-01-16 2014-09-26 한국기계연구원 Complex magnetic bearing combined with auxiliary bearing and sensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090070178A (en) 2007-12-27 2009-07-01 한국전기연구원 Capacitance measuring displacement sensor structure and it's transducer for radial active magnetic bearing
KR101444139B1 (en) 2013-01-16 2014-09-26 한국기계연구원 Complex magnetic bearing combined with auxiliary bearing and sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109763994A (en) * 2019-02-21 2019-05-17 珠海格力电器股份有限公司 Magnetic suspension bearing and magnetic suspension centrifugal compressor, air conditioner

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