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CN-115654008-B - Magnetic suspension active three-degree-of-freedom bearing, motor and compressor

CN115654008BCN 115654008 BCN115654008 BCN 115654008BCN-115654008-B

Abstract

The invention provides a magnetic suspension active three-degree-of-freedom bearing, a motor and a compressor, which comprise an axial magnetic bearing, a radial magnetic bearing and a bearing rotor, wherein the axial magnetic bearing comprises a first axial stator and a second axial stator, the radial magnetic bearing comprises a radial stator, the radial stator is positioned on the periphery of the bearing rotor and can apply radial electromagnetic force to the bearing rotor, the first axial stator and the second axial stator can apply axial electromagnetic force to the bearing rotor, at least part of the first axial stator is positioned on the radial outer side of the bearing rotor and positioned on the radial inner side of a radial winding, and at least part of the second axial stator is positioned on the radial outer side of the bearing rotor and positioned on the radial inner side of the radial winding, so that the bias magnetic flux of the radial magnetic bearing is provided by the axial magnetic bearing. According to the invention, the first and second axial stators provide the offset magnetic circuit for the radial stator, so that the original structures such as the offset stator and the like are omitted, the structure is more compact and simple, the process difficulty is reduced, the volume is reduced, and the assembly is easy.

Inventors

  • GUO WEILIN
  • GONG GAO
  • ZHANG CHAO

Assignees

  • 珠海格力电器股份有限公司

Dates

Publication Date
20260508
Application Date
20221014

Claims (14)

  1. 1. A magnetic suspension active three-degree-of-freedom bearing is characterized by comprising: An axial magnetic bearing (100), a radial magnetic bearing (200) and a bearing rotor (7), wherein the axial magnetic bearing (100) and the radial magnetic bearing (200) are sleeved on the periphery of a rotating shaft (8), the axial magnetic bearing (100) comprises a first axial stator (300) and a second axial stator (400), the radial magnetic bearing (200) comprises a radial stator (500), the bearing rotor (7) is sleeved on the periphery of the rotating shaft (8) and can rotate along with the rotating shaft (8), the radial stator (500) is positioned on the periphery of the bearing rotor (7) and can apply radial electromagnetic force to the bearing rotor (7), at least part of the structure of the first axial stator (300) is positioned on one axial end of the bearing rotor (7) along the axial direction of the rotating shaft (8), at least part of the structure of the second axial stator (400) is positioned on the other axial end of the bearing rotor (7), the first axial stator (300) and the second axial stator (400) can apply radial electromagnetic force to the bearing rotor (7), the radial stator (500) comprises a radial electromagnetic iron core (5), the radial iron core (6) is of an annular structure and sleeved on the radial outer side of the bearing rotor (7), at least part of the structure of the first axial stator (300) is positioned on the radial outer side of the bearing rotor (7) and positioned on the radial inner side of the radial winding (5), and at least part of the structure of the second axial stator (400) is positioned on the radial outer side of the bearing rotor (7) and positioned on the radial inner side of the radial winding (5), so that the bias magnetic flux of the radial magnetic bearing (200) is provided by the axial magnetic bearing (100); In the axial direction, the axial length of the radial core (6) is smaller than the axial length of the bearing rotor (7), a first axial end (71) of the bearing rotor (7) opposite to the first axial stator (300) protrudes a first preset distance from a third axial end (61) of the radial core (6) opposite to the first axial stator (300), so that the third axial end (61) of the radial core (6) is retracted relative to the first axial end (71) to form a first space into which at least part of the structure of the first axial stator (300) protrudes to be radially opposite to part of the structure of the bearing rotor (7).
  2. 2. The magnetically levitated active three degree of freedom bearing of claim 1, wherein: The second axial end (72) of the bearing rotor (7) opposite the second axial stator (400) protrudes a second predetermined distance from the fourth axial end (62) of the radial core (6) opposite the second axial stator (400) such that the fourth axial end (62) of the radial core (6) is retracted relative to the second axial end (72) to form a second space into which at least part of the structure of the second axial stator (400) protrudes to be radially opposite part of the structure of the bearing rotor (7).
  3. 3. The magnetically levitated active three degree of freedom bearing of claim 2, wherein: The first axial stator (300) comprises a first axial iron core (1) and a first axial winding (3), the first axial iron core (1) is of an annular structure, the first axial iron core (1) comprises a first main body part (1 a), a first annular part (1 b) and a second annular part (1 c), the first main body part (1 a) is of a disc structure with a first central hole, the first central hole accommodates the rotating shaft (8) and penetrates through the rotating shaft, the second annular part (1 c) is located on the radial outer side of the first annular part (1 b), one end of the first annular part (1 b) is connected with the first main body part (1 a) and the other end of the first annular part extends towards the direction of the bearing rotor (7) to be opposite to the bearing rotor (7), one end of the second annular part (1 c) is connected with the first main body part (1 a) and the other end of the second annular part extends towards the direction of the radial iron core (6) to be opposite to the radial iron core (6) and extends into the first annular part (1 b) and forms a radial groove (1 d) and is formed between the first annular part and the first annular part (1 d).
  4. 4. A magnetically levitated active three degree of freedom bearing according to claim 3, characterized in that: The first annular part (1 b) extends along the axial direction of the rotating shaft (8) and is spaced from the bearing rotor (7) by a third preset distance to form a first axial working gap (16), and the second annular part (1 c) also extends along the axial direction of the rotating shaft (8) and is spaced from the radial iron core (6) by a fourth preset distance to form a second axial working gap (19); The axial length of the second annular portion (1 c) is greater than that of the first annular portion (1 b), and one end of the second annular portion (1 c) opposite to the radial iron core (6) is located on the radial outer side of the bearing rotor (7), so that one end of the second annular portion (1 c) opposite to the radial iron core (6) is opposite to a part of the structure of the bearing rotor (7) in the radial direction.
  5. 5. A magnetically levitated active three degree of freedom bearing according to claim 3, characterized in that: The second axial stator (400) comprises a second axial iron core (2) and a second axial winding (4), the second axial iron core (2) is of an annular structure, the second axial iron core (2) comprises a second main body part (2 a), a third annular part (2 b) and a fourth annular part (2 c), the second main body part (2 a) is of a disc structure with a second central hole, the second central hole accommodates the rotating shaft (8) to pass through, one end of the third annular part (2 b) is connected with the second main body part (2 a) and the other end of the third annular part extends towards the direction of the bearing rotor (7) to be opposite to the bearing rotor (7), one end of the fourth annular part (2 c) is connected with the second main body part (2 a) and the other end of the fourth annular part extends towards the direction of the radial iron core (6) to be opposite to the radial iron core (6), the fourth annular part (2 c) is positioned on the radial outer side of the third annular part (2 b) so as to be arranged between the third annular part (2 b) and the second axial winding (2 d) and the fourth annular part (2 d) to be accommodated in the second axial winding accommodating groove (4).
  6. 6. The magnetically levitated active three degree of freedom bearing of claim 5, wherein: The third annular part (2 b) extends along the axial direction of the rotating shaft (8) and is separated from the bearing rotor (7) by a fifth preset distance to form a first axial working gap (16), and the fourth annular part (2 c) also extends along the axial direction of the rotating shaft (8) and is separated from the radial iron core (6) by a sixth preset distance to form a second axial working gap (19); The axial length of the fourth annular portion (2 c) is greater than that of the third annular portion (2 b), and one end of the fourth annular portion (2 c) opposite to the radial iron core (6) is located radially outside the bearing rotor (7), so that one end of the fourth annular portion (2 c) opposite to the radial iron core (6) is opposite to a part of the structure of the bearing rotor (7) in the radial direction.
  7. 7. The magnetically levitated active three degree of freedom bearing of claim 5, wherein: the first axial winding (3) and the second axial winding (4) are electrified in opposite directions.
  8. 8. The magnetically levitated active three degree of freedom bearing of any one of claims 1 to 7, wherein: The radial iron core (6) comprises a radial stator magnet yoke (11) and radial stator pole columns (12), the radial stator magnet yoke (11) is of an annular structure, the radial outer ends of the radial stator pole columns are connected with the radial stator magnet yoke (11), the radial inner ends of the radial stator pole columns protrude towards the bearing rotor (7) and have radial working gaps (15) with the bearing rotor (7), and each radial stator pole column is wound with the radial winding (5); And in a radial section, the radial stator (500) comprises a first quadrant part positioned at the upper right, a second quadrant part positioned at the upper left, a third quadrant part positioned at the lower left and a fourth quadrant part positioned at the lower right, the first quadrant part, the second quadrant part, the third quadrant part and the fourth quadrant part are sequentially connected in anticlockwise direction, the first quadrant part and the third quadrant part form diagonal angles, the second quadrant part and the fourth quadrant part form diagonal angles, and the magnetic circuit formed by the radial stator pole post and the magnetic yoke part in the second quadrant part is communicated with the magnetic circuit formed by the radial stator pole post and the magnetic yoke part in the fourth quadrant part to form a left radial control magnetic circuit (002), and the magnetic circuit formed by the radial stator pole post and the magnetic yoke part in the first quadrant part is communicated with the magnetic circuit formed by the radial stator pole post and the magnetic yoke part in the third quadrant part to form a right radial control magnetic circuit (003).
  9. 9. The magnetically levitated active three degree of freedom bearing of claim 8, wherein: the number of the radial stator poles is 4n, wherein n is a natural number.
  10. 10. The magnetically levitated active three degree of freedom bearing of claim 9, wherein: the radial stator pole (12) comprises a first pole (17) and a second pole (18), the circumferential width of the first pole (17) being greater than the circumferential width of the second pole (18) in a radial section, and at least one of the first pole (17) and at least one of the second pole (18) being distributed in each quadrant portion.
  11. 11. The magnetically levitated active three degree of freedom bearing of claim 8, wherein: The axial magnetic bearings (100) form axial bias magnetic circuits (001) in the radial direction towards the center of the rotating shaft (8) by providing bias magnetic flux for the radial magnetic bearings (200), or the axial bias magnetic circuits (001) in the radial direction towards the direction away from the center of the rotating shaft (8) by providing bias magnetic flux for the radial magnetic bearings (200), and in two quadrant parts forming opposite angles, the radial magnetic flux in one quadrant part faces towards the center of the rotating shaft (8) in the radial direction, and the radial magnetic flux in the other quadrant part faces away from the center of the rotating shaft (8) in the radial direction.
  12. 12. The magnetically levitated active three degree of freedom bearing of claim 8, wherein: When the first axial stator (300) comprises a first axial core (1) and a first axial winding (3), the first axial core (1) comprises a first body portion (1 a), a first annular portion (1 b) and a second annular portion (1 c), the second axial stator (400) comprises a second axial core (2) and a second axial winding (4), the second axial core (2) comprises a second body portion (2 a), a third annular portion (2 b) and a fourth annular portion (2 c): the radial winding (5) is located radially outside the second annular portion (1 c) and the fourth annular portion (2 c) at the same time, and the second annular portion (1 c) and the fourth annular portion (2 c) are opposite to the radial stator pole.
  13. 13. An electric machine comprising a magnetically levitated active three degree of freedom bearing according to any one of claims 1 to 12.
  14. 14. A compressor comprising a magnetically levitated active three degree of freedom bearing according to any one of claims 1 to 12.

Description

Magnetic suspension active three-degree-of-freedom bearing, motor and compressor Technical Field The invention relates to the technical field of magnetic suspension, in particular to a magnetic suspension active three-degree-of-freedom bearing, a motor and a compressor. Background The magnetic suspension bearing utilizes electromagnetic force to the rotor to suspend the rotating shaft, and the rotating shaft and the stator keep a non-contact state, so that the magnetic suspension bearing has the advantages of no abrasion, high rotating speed, high precision, long service life and the like. The magnetic bearings can be classified into three types according to the working principle, namely active magnetic bearings, passive magnetic bearings and hybrid magnetic bearings. The active three-degree-of-freedom magnetic bearing in the patent number CN110017330A is complex in structure, adopts an E-shaped salient pole radial segmented stator to form bias magnetic flux for the radial bearing, is complex in processing and manufacturing process, difficult to assemble and has magnetic leakage of a radial suspension winding in the axial direction. The magnetic suspension active three-degree-of-freedom bearing in the prior art forms the bias magnetic flux of the radial bearing by arranging the bias stator, so that the technical problems of complex structure, large volume, complex process, difficult assembly and the like are caused. Disclosure of Invention Therefore, the invention aims to overcome the defects of complex structure and larger volume caused by forming the bias magnetic flux of the radial bearing by arranging the bias stator in the magnetic suspension active three-degree-of-freedom bearing in the prior art, thereby providing the magnetic suspension active three-degree-of-freedom bearing, the motor and the compressor. In order to solve the above problems, the present invention provides a magnetic suspension active three-degree-of-freedom bearing, which includes: The magnetic bearing comprises a first axial stator and a second axial stator, the radial magnetic bearing comprises a radial stator, the bearing rotor is sleeved on the periphery of the rotating shaft and can rotate along with the rotating shaft, the radial stator is positioned on the periphery of the bearing rotor and can apply radial electromagnetic force to the bearing rotor, at least part of the first axial stator is positioned on one axial end of the bearing rotor along the axial direction of the rotating shaft, at least part of the second axial stator is positioned on the other axial end of the bearing rotor, the first axial stator and the second axial stator can apply axial electromagnetic force to the bearing rotor, the radial stator comprises a radial iron core and a radial winding, the radial iron core is of an annular structure and is sleeved on the radial outer side of the bearing rotor, at least part of the first axial stator is positioned on the radial outer side of the bearing rotor and can apply radial electromagnetic force to the bearing rotor, and at least part of the second axial stator is positioned on the radial inner side of the bearing rotor and can bias the magnetic flux of the bearing rotor. In some embodiments, the axial length of the radial core is less than the axial length of the bearing rotor in an axial direction, a first axial end of the bearing rotor opposite the first axial stator projects a first predetermined distance beyond a third axial end of the radial core opposite the first axial stator such that the third axial end of the radial core is retracted relative to the first axial end to form a first space into which at least a portion of the structure of the first axial stator protrudes to be radially opposite a portion of the structure of the bearing rotor; A second axial end of the bearing rotor opposite the second axial stator protrudes a second predetermined distance from a fourth axial end of the radial core opposite the second axial stator such that the fourth axial end of the radial core is retracted relative to the second axial end to form a second space into which at least a portion of the structure of the second axial stator protrudes to be radially opposite a portion of the structure of the bearing rotor. In some embodiments, the first axial stator includes a first axial core and a first axial winding, the first axial core is an annular structure, the first axial core includes a first main body portion, a first annular portion, and a second annular portion, the first main body portion is a disk structure having a first center hole, the first center hole accommodates the rotating shaft therethrough, the second annular portion is located radially outward of the first annular portion, one end of the first annular portion meets the first main body portion and the other end extends toward the direction of the bearing rotor to be opposite to the bearing rotor, one end of the second annular portion meets the firs