A magnetic suspension structural bearing for controlling radial and axial magnetic forces during high-speed rotation

Abstract

The present invention discloses a magnetic suspension structure bearing with radial-axial magnetic force control for high-speed rotation, comprising an outer shell, an inner shell mounted within the outer shell, a position sensor mounted within the inner shell and used to sense whether the disk is offset, a first magnetic suspension bearing adjustment unit for adjusting the X-axial position of the disk based on an X-axis offset signal generated by the position sensor sensing the disk position, and a second magnetic suspension bearing adjustment unit for adjusting the longitudinal position of the disk based on a longitudinal offset signal generated by the position sensor sensing the spindle position. The magnetic suspension structure bearing of the present invention precisely adjusts the motor spindle that is offset from its center position, enabling precise correction of the motor spindle through radial spindle adjustment and directional adjustment perpendicular to the spindle.

Description

Technical Field

[0001] The invention relates to a blower, in particular to a magnetic suspension structure bearing with radial and axial magnetic force control for high-speed rotation. Background Art

[0002] The bearings in a magnetic levitation motor primarily consist of magnetic bearings and auxiliary bearings. During operation, the magnetic bearings support the rotor as it rotates. Under the combined force of electromagnetic force and gravity, the rotor rotates around its axis and oscillates back and forth in the radial direction. The auxiliary bearings support the rotor when it is stationary.

[0003] If an unexpected event occurs during operation of a magnetic levitation motor, such as a sudden power failure in the magnetic bearings, the rotor can suddenly drop while rotating at high speeds (over 30,000 rpm). Because the gap between the auxiliary bearing and the rotor is smaller than the gap between the magnetic bearings and the rotor, the auxiliary bearing is instantly subjected to a significant impact force when the rotor drops, rotating at high speed along with the rotor. This can cause the auxiliary bearing to sinter and crack at high temperatures.

[0004] In addition, when the magnetic levitation motor is running, if it is impacted by the load or the magnetic bearing controller is unstable, the rotor will become unstable and vibrate back and forth away from the center axis, which will easily collide with the inner wall of the shell. If the rotor collides too many times, it will easily cause the rotor to bend and deform, and eventually make the magnetic levitation motor unusable.

[0005] Therefore, it is necessary to improve the magnetic levitation structure bearing. Summary of the Invention

[0006] In response to the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a magnetic levitation structure bearing with radial and axial magnetic force control for high-speed rotation. The purpose of designing this magnetic levitation structure bearing is to accurately adjust the motor spindle that is offset from the center position, and the motor spindle can be accurately corrected through radial adjustment of the spindle and directional adjustment of the vertical spindle.

[0007] To solve the above technical problems, the present invention is implemented through the following solutions: A magnetic suspension structure bearing with radial and axial magnetic force control for high-speed rotation of the present invention comprises:

[0008] shell;

[0009] an inner housing mounted within the outer housing;

[0010] a position sensing portion installed in the inner housing and used to sense whether the disc is offset;

[0011] a first magnetic bearing adjustment unit for adjusting the X-axis position of the disk according to an X-axis offset signal generated by the position sensing unit in response to the position of the disk;

[0012] The second magnetic bearing adjustment unit adjusts the longitudinal position of the disk body according to the longitudinal offset signal generated by the position sensing unit sensing the position of the main shaft.

[0013] Furthermore, the position sensing portion is fixed in a first annular groove of an opening of the shaft hole at one end of the inner shell, and comprises a ring body, a plurality of first position sensors mounted on an annular surface of the ring body and distributed in an annular array, and a plurality of second position sensors mounted on an inner ring of the ring body and distributed in an annular array;

[0014] The first annular groove is provided with a plurality of annular array through holes, and the first position sensor passes through the through holes, with its sensing direction facing the disk body;

[0015] Wherein, the sensing direction of the second position sensor is toward the main shaft.

[0016] Furthermore, the inner shell has an axial hole passing through both ends and is provided with adjacent first and second annular cavities. The first magnetic bearing adjustment part is installed in the first annular cavity, and the second magnetic bearing adjustment part is installed in the second annular cavity.

[0017] Furthermore, the disc is arranged in the inner shell, the disc body is located in the first annular cavity, the sleeve extends to the second annular cavity, and a magnetic ring is sleeved and fixed on the sleeve located in the second annular cavity;

[0018] The first magnetic bearing adjustment portion includes a first frame and a first electromagnetic coil wound within the first frame. An adjustment gap is left between the inner ring of the first frame and the disc and the sleeve. The winding direction of the first electromagnetic coil satisfies: the magnetic field generated by the first electromagnetic coil can drive the disc to move radially along the main shaft.

[0019] The second magnetic bearing adjustment part includes a second skeleton and multiple groups of second electromagnetic coils wound on the second skeleton. An adjustment gap is left between the second skeleton and the magnetic ring. The multiple groups of second electromagnetic coil ring arrays are distributed on the second skeleton. The direction of the magnetic field generated by them can drive the magnetic ring to drive the disk and the main shaft to move in the longitudinal plane.

[0020] Furthermore, the first skeleton is provided with a third annular cavity concentric with the first annular cavity, and the first electromagnetic coil is wound along the circumferential direction of the third annular cavity.

[0021] Furthermore, bone positions for winding the second electromagnetic coil are distributed in a ring array between the outer ring and the inner ring of the second skeleton, and each bone position points to the center of the second skeleton and the center of the second annular cavity, and a group of second electromagnetic coils are wound on each bone position.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the magnetic levitation structure bearing of the present invention can accurately adjust the motor spindle with an offset center position, and the motor spindle can be accurately corrected through radial adjustment of the spindle and directional adjustment of the vertical spindle.

[0023] The present invention cleverly uses a position sensing portion to sense the radial position offset of the spindle and the position offset in the direction perpendicular to the spindle, and can accurately sense the position change of the spindle.

[0024] The magnetic suspension structure bearing of the present invention cleverly uses the first magnetic suspension bearing adjustment part to correct the radial position of the main shaft.

[0025] The magnetic suspension structure bearing of the present invention cleverly uses the second magnetic suspension bearing adjustment part to correct the position in the radial direction of the vertical main axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of the magnetic bearing assembly of the present invention.

[0027] Figure 2 It is a structural diagram of the inner shell of the present invention.

[0028] Figure 3 This is a diagram of the installation structure of the first magnetic bearing adjustment part and the second magnetic bearing adjustment part of the present invention.

[0029] Figure 4 This is a structural diagram of the second magnetic bearing adjustment unit of the present invention.

[0030] Figure 5 It is a structural diagram of the disc of the present invention.

[0031] Figure 6 This is a structural diagram of the position sensor of the present invention.

[0032] Markings in the accompanying drawings: outer shell 31, inner shell 32, second electromagnetic coil 33, bearing 34, magnetic ring 35, disk 37, position sensing part 38, first electromagnetic coil 39, first skeleton 310, second skeleton 311, first annular cavity 321, second annular cavity 322, first annular groove 323, disk body 371, sleeve 372, ring body 381, second position sensor 382, first position sensor 383. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more specific definition of the scope of protection of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example 1: The specific structure of the present invention is as follows:

[0035] Please refer to the attached Figure 1-6 The present invention provides a magnetic suspension structure bearing with radial and axial magnetic force control for high-speed rotation, comprising:

[0036] Housing 31;

[0037] An inner shell 32 installed in the outer shell 31;

[0038] A position sensor 38 installed in the inner housing 32 and configured to sense whether the disc 37 is offset;

[0039] a first magnetic bearing adjustment unit for adjusting the X-axis position of the disk 371 according to an X-axis offset signal generated by the position sensor 38 in response to the position of the disk 371;

[0040] The second magnetic bearing adjustment unit adjusts the longitudinal position of the disk 371 according to the longitudinal offset signal generated by the position sensing unit 38 sensing the spindle position.

[0041] In a preferred technical solution of this embodiment, the position sensing unit 38 is fixed in the first annular groove 323 of the axial hole opening at one end of the inner shell 32, and includes a ring body 381, a plurality of first position sensors 383 installed on one annular surface of the ring body 381 and distributed in a ring array, and a plurality of second position sensors 382 installed on the inner ring of the ring body 381 and distributed in a ring array;

[0042] The first annular groove 323 is provided with a plurality of annular array through holes, and the first position sensor 383 passes through the through holes, with its sensing direction facing the disk body 371;

[0043] The sensing direction of the second position sensor 382 is toward the main shaft.

[0044] A preferred technical solution of this embodiment is that the inner shell 32 has an axial hole passing through both ends and adjacent first annular cavity 321 and second annular cavity 322 are provided in the inner shell 32, the first magnetic bearing adjustment part is installed in the first annular cavity 321, and the second magnetic bearing adjustment part is installed in the second annular cavity 322.

[0045] In a preferred technical solution of this embodiment, the disk 37 is disposed in the inner shell 32, with its disk body 371 located in the first annular cavity 321, and its sleeve 372 extending into the second annular cavity 322. The magnetic ring 35 is sleeved and fixed on the sleeve 372 located in the second annular cavity 322;

[0046] The first magnetic bearing adjustment portion includes a first frame 310 and a first electromagnetic coil 39 wound within the first frame 310. An adjustment gap is left between the inner ring of the first frame 310 and the disc 371 and the sleeve 372. The winding direction of the first electromagnetic coil 39 satisfies the following requirements: the magnetic field generated by the first electromagnetic coil 39 can drive the disc 371 to move radially along the main shaft.

[0047] The second magnetic bearing adjustment part includes a second skeleton 311 and multiple groups of second electromagnetic coils 33 wound on the second skeleton 311. An adjustment gap is left between the second skeleton 311 and the magnetic ring 35. The multiple groups of second electromagnetic coils 33 are distributed in a ring array on the second skeleton 311. The direction of the magnetic field generated by them can drive the magnetic ring 35 to drive the disk 371 and the main shaft to move in the longitudinal plane.

[0048] In a preferred technical solution of this embodiment, the first skeleton 310 is provided with a third annular cavity concentric with the first annular cavity 321 , and the first electromagnetic coil 39 is wound along the circumferential direction of the third annular cavity.

[0049] A preferred technical solution of this embodiment is that bone positions for winding the second electromagnetic coil 33 are distributed in a ring array between the outer ring and the inner ring of the second skeleton 311, and each bone position points to the center of the second skeleton 311 and coincides with the center of the second annular cavity 322, and a group of second electromagnetic coils 33 are wound on each bone position.

[0050] Example 2:

[0051] The following is the working principle of the present invention applied to an air suspension centrifugal blower:

[0052] like Figure 1-6 As shown, the disc 37 and the blower main shaft of the present invention rotate synchronously and coaxially. When the second electromagnetic coil 33 is supplied with alternating current, the electromagnetic field generated by the second electromagnetic coil 33 can act on the magnetic ring 35.

[0053] Taking the magnetic ring 35 as an example, how to make the spindle offset and then correct it, such as Figure 1-6As shown, when the spindle is not offset, the distance between the spindle and each second position sensor 382 is equal. When the spindle is offset to one side, the second position sensor 382 will immediately sense the position change of the spindle, and send the offset position signal to the magnetic levitation controller. The magnetic levitation controller controls one or more second electromagnetic coils 33 that are farther away from the spindle to be powered on. After the one or more second electromagnetic coils 33 that are farther away from the spindle are powered on, an electromagnetic field is generated to act on the magnetic ring 35, and the magnetic ring 35 is attracted to move toward the one or more second electromagnetic coils 33 that are powered on until the correction is accurate.

[0054] Similarly, the disc 37 includes a magnetic material on the disc 37, which is acted upon by the energized first electromagnetic coil 39. When the spindle's axial position deviates from a preset standard position, the distance between the first position sensor 383 and the disc 371 increases or decreases. The first position sensor 383 senses this position change and transmits a position signal indicating the deviation to the magnetic levitation controller. The magnetic levitation controller then energizes the first electromagnetic coil 39, generating an electromagnetic field that acts on the disc 371.

[0055] When the distance between the first position sensor 383 and the disk 371 increases, the electromagnetic field generated by the first electromagnetic coil 39 after power-on generates an attractive force on the disk 371 , and attracts the disk 371 back to the preset standard position.

[0056] When the distance between the first position sensor 383 and the disk 371 decreases, the electromagnetic field generated by the powered-on first electromagnetic coil 39 generates a repulsive force on the disk 371 , repelling the disk 371 back to a preset standard position.

[0057] Example 3:

[0058] The inner housing 32 has a second annular groove at one end away from the position sensing portion 38 , in which a bearing 34 is mounted. The inner sleeve of the bearing 34 is fixed to the outer end of the sleeve 372 .

[0059] In summary, the magnetic levitation structure bearing of the present invention is used to precisely adjust the motor spindle of the offset center position, and the motor spindle can be precisely corrected through the radial adjustment of the spindle and the orientation adjustment of the vertical spindle. The present invention cleverly uses a position sensing part to sense the offset of the radial position of the spindle and the position offset in the direction perpendicular to the spindle, and can accurately sense the position change of the spindle. The magnetic levitation structure bearing of the present invention cleverly uses the first magnetic levitation bearing adjustment part to correct the radial position of the spindle. The magnetic levitation structure bearing of the present invention cleverly uses the second magnetic levitation bearing adjustment part to correct the position in the radial direction perpendicular to the spindle.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A magnetic suspension structure bearing with radial and axial magnetic force control for high-speed rotation, characterized in that: include: housing (31); an inner shell (32) mounted inside the outer shell (31); a position sensing portion (38) installed in the inner housing (32) and used to sense whether the disc (37) is offset; a first magnetic suspension bearing adjustment unit for adjusting the X-axis position of the disk (371) according to an X-axis offset signal generated by the position sensing unit (38) sensing the position of the disk (371); a second magnetic suspension bearing adjustment unit for adjusting the longitudinal position of the disk (371) according to a longitudinal offset signal generated by the position sensing unit (38) sensing the position of the main shaft; The position sensing portion (38) is fixed in a first annular groove (323) at an end of the axial hole of the inner shell (32), and comprises a ring body (381), a plurality of first position sensors (383) installed on an annular surface of the ring body (381) and distributed in an annular array, and a plurality of second position sensors (382) installed on an inner ring of the ring body (381) and distributed in an annular array; The first annular groove (323) is provided with a plurality of annular array through holes, and the first position sensor (383) passes through the through holes, with its sensing direction facing the disk body (371); wherein the sensing direction of the second position sensor (382) is toward the main shaft; The inner shell (32) has an axial hole passing through both ends, and a first annular cavity (321) and a second annular cavity (322) adjacent to each other are provided in the inner shell (32), the first magnetic bearing adjustment portion is installed in the first annular cavity (321), and the second magnetic bearing adjustment portion is installed in the second annular cavity (322); The disc (37) is arranged in the inner shell (32), the disc body (371) is located in the first annular cavity (321), the shaft sleeve (372) extends to the second annular cavity (322), and a magnetic ring (35) is sleeved and fixed on the shaft sleeve (372) located in the second annular cavity (322); The first magnetic bearing adjustment portion comprises a first frame (310), a first electromagnetic coil (39) wound inside the first frame (310), an adjustment gap is left between the inner ring of the first frame (310), the disk (371), and the shaft sleeve (372), and the winding direction of the first electromagnetic coil (39) satisfies: the magnetic field generated by the first electromagnetic coil (39) can drive the disk (371) to move radially along the main shaft; The second magnetic bearing adjustment portion comprises a second frame (311), a plurality of second electromagnetic coils (33) wound on the second frame (311), an adjustment gap is left between the second frame (311) and the magnetic ring (35), and the plurality of second electromagnetic coils (33) are distributed in a ring array on the second frame (311). The direction of the magnetic field generated by the plurality of second electromagnetic coils (33) can drive the magnetic ring (35) to drive the disk (371) and the main shaft to move in the longitudinal plane; The first skeleton (310) is provided with a third annular cavity concentric with the first annular cavity (321), and the first electromagnetic coil (39) is wound along the circumferential direction of the third annular cavity; Bone positions for winding the second electromagnetic coil (33) are distributed in a ring array between the outer ring and the inner ring of the second skeleton (311), and each bone position points to the center of the second skeleton (311) and the center of the second annular cavity (322) so as to coincide with each other, and a group of second electromagnetic coils (33) are wound on each bone position.

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