External winding controlled inner and outer double rotor hybrid magnetic bearing

Abstract

The present invention relates to the field of non-mechanical contact magnetic bearings, and discloses an outer winding controlled inner and outer double rotor hybrid magnetic bearing, comprising a stator, an outer rotor, and an inner rotor, wherein the stator comprises a left magnetic conductive ring, four left outer arc-shaped iron cores, four left inner arc-shaped iron cores, a left control ring, a stator permanent magnet ring, a right control ring, four right inner arc-shaped iron cores, four right outer arc-shaped iron cores, and a right magnetic conductive ring, which are arranged in sequence from left to right; the left and right control rings are connected by a stator permanent magnet ring; the left and right magnetic conductive rings are connected to the control ring by an arc-shaped iron core; a control winding is wound on the arc-shaped iron core, and the outer and inner rotors are the outer and inner rotor iron cores, respectively. Compared with the prior art, the present invention adopts a control ring to realize the stable suspension of the inner and outer rotors respectively, which meets the application requirements of some special occasions, and the control winding is located outside the control ring, and the magnetic pole area can be designed to be maximum, thereby increasing the radial bearing capacity and the suspension force density.

Description

Technical Field

[0001] The present invention relates to the technical field of non-mechanical contact magnetic bearings, and in particular to an outer winding-controlled inner and outer double-rotor hybrid magnetic bearing, which can be used as a contactless suspension support for high-speed transmission components such as flywheel systems, machine tool electric spindles, centrifuges, etc. Background Art

[0002] Magnetic bearings are a new type of high-performance bearing that uses the electromagnetic force between the stator and the rotor to suspend the rotor in space, so that there is no mechanical contact between the stator and the rotor. At present, magnetic bearings are divided into the following three types according to the way the magnetic force is provided: (1) Active magnetic bearings, in which the bias magnetic field is generated by the bias current, and the control magnetic flux generated by the control current is superimposed on the bias magnetic flux to generate a controllable suspension force. This type of magnetic bearing has a relatively large volume, weight and power consumption; (2) Passive magnetic bearings, in which the suspension force is completely provided by permanent magnets. The required controller is simple, the suspension power consumption is small, but the stiffness and damping are small. It is generally used to support objects in only one direction or to reduce the load acting on traditional bearings; (3) Hybrid magnetic bearings, in which permanent magnetic materials are used to replace the electromagnets in active magnetic bearings to generate the bias magnetic field. The control current only provides the control magnetic flux to balance the load or interference, which greatly reduces the power loss of the magnetic bearing, reduces the volume of the magnetic bearing, reduces its weight, and improves its carrying capacity.

[0003] The common feature of existing hybrid magnetic bearing structures is that the radial stator poles are wound around the control winding to generate radial control flux, which passes through the radial working air gap and interacts with the corresponding bias flux to generate radial suspension force. The radial control winding of the hybrid magnetic bearing shaft of this structure occupies radial space, the radial pole area cannot be maximized, the radial bearing capacity is small, the axial length is long, and the critical speed is low. Summary of the invention

[0004] Purpose of the invention: In view of the problems existing in the prior art, the present invention provides an inner and outer double-rotor hybrid magnetic bearing controlled by an outer winding, in which a static bias flux is provided by a stator permanent magnet ring, and the control flux generated by energizing the control winding adjusts the corresponding bias flux. The radial magnetic poles have no windings and are all located in the axial direction. The magnetic pole area can be designed to be maximized, which effectively increases the winding space and radial bearing capacity.

[0005] Technical solution: The present invention provides an inner and outer double-rotor hybrid magnetic bearing controlled by an outer winding, comprising a stator, an outer rotor and an inner rotor, wherein the stator comprises a left magnetic conductive ring, four circumferentially arranged left outer arc-shaped iron cores, four circumferentially arranged left inner arc-shaped iron cores, a left control ring, a stator permanent magnet ring, a right control ring, four circumferentially arranged right inner arc-shaped iron cores, four circumferentially arranged right outer arc-shaped iron cores and a right magnetic conductive ring, which are arranged in sequence from left to right; the left magnetic conductive ring and the right magnetic conductive ring respectively comprise a left outer magnetic conductive ring and a left inner magnetic conductive ring, a right outer magnetic conductive ring and a right inner magnetic conductive ring; the left control ring and the right control ring are respectively divided into a left outer control ring and a left inner control ring, a right outer control ring and a right inner control ring by a magnetically isolating aluminum ring, and the left outer control ring and the right outer control ring The left inner control ring and the right inner control ring are respectively divided into four blocks evenly from the center to the circumference by four magnetically isolating aluminum blocks; the left control ring and the right control ring are connected by a stator permanent magnet ring; the left outer magnetic conductive ring, the right outer magnetic conductive ring, the left inner magnetic conductive ring and the right inner magnetic conductive ring are respectively connected with the left outer control ring, the right outer control ring, the left inner control ring and the right inner control ring through their corresponding four circularly arranged arc-shaped iron cores; each arc-shaped iron core is respectively located between the two magnetically isolating aluminum blocks on its corresponding control ring; the outer rotor includes an outer rotor core, and the inner rotor includes an inner rotor core, the outer rotor core is located at the outer circumference of the left outer control ring and the right outer control ring, and the inner rotor core is located at the inner circumference of the left inner control ring and the right inner control ring.

[0006] Furthermore, a centralized control winding is wound on each arc-shaped iron core, the winding on the left outer arc-shaped iron core is the left outer control winding, the winding on the left inner arc-shaped iron core is the left inner control winding, the winding on the right outer arc-shaped iron core is the right outer control winding, and the winding on the right inner arc-shaped iron core is the right inner control winding. The left outer control winding is located between the left outer control ring and the left outer magnetic ring; the left inner control winding is located between the left inner control ring and the left inner magnetic ring; the right outer control winding is located between the right outer control ring and the right outer magnetic ring; and the right inner control winding is located between the right inner control ring and the right inner magnetic ring.

[0007] Furthermore, after the left outer control winding and the right outer control winding, and the left inner control winding and the right inner control winding are respectively connected in reverse series or in parallel, the left outer control winding and the left inner control winding are connected in series or in parallel in the same direction, and the right outer control winding and the right inner control winding are connected in series or in parallel in the same direction, so as to control two radial degrees of freedom.

[0008] Furthermore, the outer rotor core is an inverted "U"-shaped ring core, which is opposite to the left outer control ring and the right outer control ring, and the inner rotor core is an "H"-shaped ring core, which is opposite to the left inner control ring and the right inner control ring.

[0009] Furthermore, the outer rotor core forms an outer air gap with the left outer control ring and the right outer control ring respectively; the inner rotor core forms an inner air gap with the left inner control ring and the right inner control ring respectively.

[0010] Furthermore, the left control ring, the right control ring, the outer rotor core, the inner rotor core, the left magnetic conductive ring, the right magnetic conductive ring and each arc core are all made of a whole piece of magnetic conductive material; the stator permanent magnet ring is made of rare earth permanent magnet material.

[0011] Beneficial effects:

[0012] The present invention provides a static bias flux by means of a stator permanent magnet ring, and the control flux generated by the control winding being energized adjusts the corresponding bias flux; the radial magnetic poles of the hybrid magnetic bearing of this structure have no windings and are all located on the outside of the control ring in the axial direction, and the magnetic pole area can be designed to be maximized, which effectively increases the winding space and radial bearing capacity, and has the advantages of compact structure, low power consumption, and easy assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a split and suspended magnetic flux diagram of an inner and outer double rotor hybrid magnetic bearing controlled by an outer winding of the present invention;

[0014] Figure 2 This is a radial suspension flux diagram on the left side of an inner and outer double-rotor hybrid magnetic bearing controlled by an outer winding of the present invention;

[0015] Figure 3 This is a right radial suspension flux diagram of an inner and outer double-rotor hybrid magnetic bearing controlled by an outer winding of the present invention;

[0016] Figure 4 The left radial suspension flux diagram of an inner and outer double-rotor hybrid magnetic bearing controlled by an outer winding without a left control ring of the present invention;

[0017] Figure 5 This is a right side radial suspension flux diagram of an inner and outer double rotor hybrid magnetic bearing controlled by an outer winding without a right side control ring according to the present invention.

[0018] Among them, 1-outer rotor core, 2-inner rotor core, 3-stator permanent magnet ring, 4-left outer control ring, 5-left inner control ring, 6-right outer control ring, 7-right inner control ring, 8-left outer magnetic ring, 9-left inner magnetic ring, 10-right outer magnetic ring, 11-right inner magnetic ring, 12-left outer control winding, 13-left inner control winding, 14-right outer control winding, 15-right inner control Winding, 16-magnetic isolation aluminum ring A, 17-magnetic isolation aluminum ring B, 18-outer air gap, 19-inner air gap, 20-left magnetic isolation aluminum block, 21-right magnetic isolation aluminum block, 22-left outer arc core, 23-left inner arc core, 24-right outer arc core, 25-right inner arc core, 26-static bias flux one, 27-static bias flux two, 28-outer radial suspension control flux, 29-inner radial suspension control flux. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0020] Specific implementation method Figure 1-5 As shown, the present invention discloses an outer winding controlled inner and outer double rotor hybrid magnetic bearing, including a stator, an inner rotor and an outer rotor, wherein the stator includes a left magnetic conductive ring, four circumferentially arranged left outer arc-shaped iron cores 22, four circumferentially arranged left inner arc-shaped iron cores 23, a left control ring, a stator permanent magnet ring 3, a right control ring, four circumferentially arranged right inner arc-shaped iron cores 25, four circumferentially arranged right outer arc-shaped iron cores 24 and a right magnetic conductive ring. The left magnetic conductive ring and the right magnetic conductive ring respectively include a left outer magnetic conductive ring 8 and a left inner magnetic conductive ring 9, a right outer magnetic conductive ring 10, and a right inner magnetic conductive ring 11, see the attached Figure 1 The left control ring and the right control ring are respectively divided into a left outer control ring 4 and a left inner control ring 5, a right outer control ring 6 and a right inner control ring 7 by corresponding magnetic isolation aluminum rings, see the attached Figure 1 and attached Figure 2 The left control ring is divided into a left outer control ring 4 and a left inner control ring 5 by a left magnetic isolation aluminum ring 16 , and the right control ring is divided into a right outer control ring 6 and a right inner control ring 7 by a right magnetic isolation aluminum ring 17 .

[0021] The left outer control ring 4, the right outer control ring 6, the left inner control ring 5, and the right inner control ring 7 are respectively composed of four magnetic isolation aluminum blocks, which are evenly divided into four pieces along the direction from the center to the circumference, and the positions correspond to each other. Figure 2 With attached Figure 3The left outer control ring 4 and the left inner control ring 5 are divided into four pieces by the left magnetic isolation aluminum block 20, and the right outer control ring 6 and the right inner control ring 7 are divided into four pieces by the right magnetic isolation aluminum block 21.

[0022] The left control ring and the right control ring are connected by the stator permanent magnet ring 3. The outer diameter of the stator permanent magnet ring 3 is larger than the inner diameter of the left outer control ring 4 and the right outer control ring 6. The inner diameter of the stator permanent magnet ring 3 is smaller than the outer diameter of the left inner control ring 5 and the right inner control ring 7. In this way, the stator permanent magnet ring 3 fixes the four control rings, namely, the left outer control ring 4, the right outer control ring 6, the left inner control ring 5, and the right inner control ring 7. The left outer magnetic conductive ring 8 is connected to the left outer control ring 4 through four left outer arc-shaped iron cores 22, the right outer magnetic conductive ring 10 is connected to the right outer control ring 6 through four right outer arc-shaped iron cores 24, the left inner magnetic conductive ring 9 is connected to the left inner control ring 5 through four left inner arc-shaped iron cores 23, and the right inner magnetic conductive ring 11 is connected to the right inner control ring 7 through four right inner arc-shaped iron cores 25.

[0023] See attached Figure 4 With attached Figure 5 Each arc-shaped iron core is located between two magnetic isolation aluminum blocks on its corresponding control ring. A centralized control winding is wound on each arc-shaped iron core. The left outer arc-shaped iron core 22 is wound with the left outer control winding 12, the left inner arc-shaped iron core 23 is wound with the left inner control winding 13, the right outer arc-shaped iron core 24 is wound with the right outer control winding 14, and the right inner arc-shaped iron core 25 is wound with the right inner control winding 15.

[0024] The left outer control winding 12, the right outer control winding 14, the left inner control winding 13 and the right inner control winding 15 are used for suspension control. After the opposite two-pole windings on the left outer arc core 22 and the right outer arc core 24, and the opposite two-pole windings on the left inner arc core 23 and the right inner arc core 25 are respectively connected in series or in parallel in reverse direction, the windings at the same position of the left outer arc core 22 and the left inner arc core 23, and the right outer arc core 24 and the right inner arc core 25 are then connected in series or in parallel in the same direction to control the two radial degrees of freedom. That is, after the left outer control winding 12 and the right outer control winding 14 are respectively connected in reverse series or parallel, and the left inner control winding 13 and the right inner control winding 15 are respectively connected in reverse series or parallel, the left outer control winding 12 and the left inner control winding 13 are then connected in series or parallel in the same direction, and the right outer control winding 14 and the right inner control winding 15 are then connected in series or parallel in the same direction, to control the two radial degrees of freedom.

[0025] The outer rotor includes an outer rotor core 1, and the inner rotor includes an inner rotor core 2. The outer rotor core 1 is an inverted "U"-shaped annular core, which is opposite to the left outer control ring 4 and the right outer control ring 6. The inner rotor core 2 is an "H"-shaped annular core, which is opposite to the left inner control ring 5 and the right inner control ring 7. The outer rotor core 1 is located on the outer circumference of the left outer control ring 4 and the right outer control ring 6, and is respectively opposite to the left outer control ring 4 and the right outer control ring 6 and forms an outer air gap 18. The inner rotor core 2 is located on the inner circumference of the left inner control ring 5 and the right inner control ring 7, and is respectively opposite to the left inner control ring 5 and the right inner control ring 6 and forms an inner air gap 19.

[0026] The left control ring, the right control ring, the outer rotor core 1, the inner rotor core 2, the left magnetic conductive ring, the right magnetic conductive ring and each arc core are all made of a whole piece of magnetic conductive material; the stator permanent magnet ring 3 is made of rare earth permanent magnet material.

[0027] In order to facilitate the description of the magnetic flux direction, the control rings divided into four parts are marked as follows: the four left outer control rings 4, the left inner control ring 5, the right outer control ring 6, and the right inner control ring 7 are respectively marked as: left outer control ring 4a, left outer control ring 4b, left outer control ring 4c, left outer control ring 4d; left inner control ring 5a, left inner control ring 5b, left inner control ring 5c, left inner control ring 5d; right outer control ring 6a, right outer control ring 6b, right outer control ring 6c, right outer control ring 6d; right inner control ring 7a, right inner control ring 7b, right inner control ring 7c, right inner control ring 7d, and the markings in the figure refer to the attached Figure 4 With attached Figure 5 The arc cores are marked as: left outer arc core 22a, left outer arc core 22b, left outer arc core 22c, left outer arc core 22d; left inner arc core 23a, left inner arc core 23b, left inner arc core 23c, left inner arc core 23d; right outer arc core 24a, right outer arc core 24b, right outer arc core 24c, right outer arc core 24d; right inner arc core 25a, right inner arc core 25b, right inner arc core 25c, right inner arc core 25d.

[0028] The stator permanent magnet ring 3 provides a static bias flux 1 26 and a static bias flux 1 27. The magnetic circuit of the static bias flux 1 26 is as follows: the magnetic flux starts from the N pole of the stator permanent magnet ring 3, passes through the right outer control ring 6a, the outer air gap 18, the outer rotor core 1, the outer air gap 18, the left outer control ring 4a corresponding to the position of the right outer control ring 6a, and returns to the S pole of the stator permanent magnet ring 3. The magnetic circuit of the static bias flux 2 27 is as follows: the magnetic flux starts from the N pole of the stator permanent magnet ring 3, passes through the right inner control ring 7a, the inner air gap 19, the inner rotor core 2, the inner air gap 19, the left inner control ring 5a corresponding to the position of the right inner control ring 7a, and returns to the S pole of the stator permanent magnet ring 3.

[0029] The outer radial suspension control magnetic flux 28 generated by energizing the left outer control winding 12 and the right outer control winding 14 has a magnetic circuit as follows: the left outer control ring 4b, the left outer arc-shaped iron core 22b corresponding to the left outer control ring 4b, the left outer magnetic conductive ring 8, the left outer arc-shaped iron core 22a corresponding to the left outer control ring 4a, the left outer control ring 4a, the outer air gap 18, the outer rotor core 1, the outer air gap 18, and the left outer control ring 4b form a closed loop.

[0030] The inner radial suspension control magnetic flux 29 generated by energizing the left inner control winding 13 and the right inner control winding 15 has a magnetic circuit as follows: the left inner control ring 5a, the left inner arc-shaped iron core 23a corresponding to the left inner control ring 5a, the left inner magnetic conductive ring 9, the left inner arc-shaped iron core 23b on the left inner control ring 5b, the left inner control ring 5b, the inner air gap 19, the inner rotor core 2, the inner air gap 19, and the left inner control ring 5a form a closed loop.

[0031] Suspension principle: The radial static bias flux 26, the static bias flux 27 interacts with the outer radial suspension control flux 28 and the inner radial suspension control flux 29, so that the air gap magnetic field on the same side as the radial eccentricity of the rotor is superimposed and weakened, while the air gap magnetic field in the opposite direction is superimposed and enhanced, generating a force on the rotor in the opposite direction of the rotor offset, pulling the rotor back to the radial equilibrium position.

[0032] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An outer winding controlled inner and outer double rotor hybrid magnetic bearing, comprising a stator, an outer rotor and an inner rotor, characterized in that: The stator comprises, arranged from left to right in sequence, a left magnetic conductive ring, four circumferentially arranged left outer arc-shaped iron cores (22), four circumferentially arranged left inner arc-shaped iron cores (23), a left control ring, a stator permanent magnet ring (3), a right control ring, four circumferentially arranged right inner arc-shaped iron cores (25), four circumferentially arranged right outer arc-shaped iron cores (24), and a right magnetic conductive ring; the left magnetic conductive ring and the right magnetic conductive ring respectively comprise a left outer magnetic conductive ring (8) and a left inner magnetic conductive ring (9), a right outer magnetic conductive ring (10), and a right inner magnetic conductive ring (11); the left control ring and the right control ring are respectively divided into a left outer control ring (4) and a left inner control ring (5), a right outer control ring (6), and a right inner control ring (7) by a magnetically isolating aluminum ring; the left outer control ring (4), the right outer control ring (6), the left inner control ring (5), and the right inner control ring (7) are respectively The four magnetically isolating aluminum blocks are evenly divided into four blocks along the direction from the center of the circle to the circumference; the left control ring and the right control ring are connected via a stator permanent magnet ring (3); the left outer magnetic conductive ring (8), the right outer magnetic conductive ring (10), the left inner magnetic conductive ring (9) and the right inner magnetic conductive ring (11) are respectively connected to the left outer control ring (4), the right outer control ring (6), the left inner control ring (5) and the right inner control ring (7) via their corresponding four arc-shaped iron cores arranged in a circle; each arc-shaped iron core is respectively located between two magnetically isolating aluminum blocks on its corresponding control ring; the outer rotor comprises an outer rotor iron core (1), and the inner rotor comprises an inner rotor iron core (2); the outer rotor iron core (1) is located on the outer circumference of the left outer control ring (4) and the right outer control ring (6), and the inner rotor iron core (2) is located on the inner circumference of the left inner control ring (5) and the right inner control ring (7); The outer rotor core (1) is an inverted "U"-shaped annular core, which is located opposite to the left outer control ring (4) and the right outer control ring (6); the inner rotor core (2) is an "H"-shaped annular core, which is located opposite to the left inner control ring (5) and the right inner control ring (7); The outer rotor core (1) forms an outer air gap (18) with the left outer control ring (4) and the right outer control ring (6); the inner rotor core (2) forms an inner air gap (19) with the left inner control ring (5) and the right inner control ring (7); The left outer control ring (4), the left inner control ring (5), the right outer control ring (6), and the right inner control ring (7) are respectively recorded as: left outer control ring (4a), left outer control ring (4b), left outer control ring (4c), and left outer control ring (4d); left inner control ring (5a), left inner control ring (5b), left inner control ring (5c), and left inner control ring (5d); right outer control ring (6a), right outer control ring (6b), right outer control ring (6c), and right outer control ring (6d); right inner control ring (7a), right inner control ring (7b), right inner control ring (7c), and right inner control ring (7d); The stator permanent magnet ring (3) provides a static bias magnetic flux 1 (26) and a static bias magnetic flux 2 (27). The magnetic circuit of the static bias magnetic flux 1 (26) is as follows: the magnetic flux starts from the N pole of the stator permanent magnet ring (3), passes through the right outer control ring (6a), the outer air gap (18), the outer rotor core (1), the outer air gap (18), the left outer control ring (4a) corresponding to the position of the right outer control ring (6a), and returns to the S pole of the stator permanent magnet ring (3); The magnetic circuit of the second static bias magnetic flux (27) is as follows: the magnetic flux starts from the N pole of the stator permanent magnet ring (3), passes through the right inner control ring (7a), the inner air gap (19), the inner rotor core (2), the inner air gap (19), the left inner control ring (5a) corresponding to the position of the right inner control ring (7a), and returns to the S pole of the stator permanent magnet ring (3).

2. The outer winding controlled inner and outer double rotor hybrid magnetic bearing according to claim 1, characterized in that: A centralized control winding is wound on each arc-shaped iron core. The winding on the left outer arc-shaped iron core (22) is the left outer control winding (12), the winding on the left inner arc-shaped iron core (23) is the left inner control winding (13), the winding on the right outer arc-shaped iron core (24) is the right outer control winding (14), and the winding on the right inner arc-shaped iron core (25) is the right inner control winding (15). The left outer control winding (12) is located between the left outer control ring (4) and the left outer magnetic conductive ring (8); the left inner control winding (13) is located between the left inner control ring (5) and the left inner magnetic conductive ring (9); the right outer control winding (14) is located between the right outer control ring (6) and the right outer magnetic conductive ring (10); and the right inner control winding (15) is located between the right inner control ring (7) and the right inner magnetic conductive ring (11).

3. The outer winding controlled inner and outer double rotor hybrid magnetic bearing according to claim 2, characterized in that: The left outer control winding (12) and the right outer control winding (14) are respectively connected in reverse series or in parallel, and the left inner control winding (13) and the right inner control winding (15) are respectively connected in reverse series or in parallel. Then, the left outer control winding (12) and the left inner control winding (13) are connected in series or in parallel in the same direction, and the right outer control winding (14) and the right inner control winding (15) are connected in series or in parallel in the same direction, thereby controlling two radial degrees of freedom.

4. An outer winding controlled inner and outer double rotor hybrid magnetic bearing according to any one of claims 1 to 3, characterized in that: The left control ring, the right control ring, the outer rotor core (1), the inner rotor core (2), the left magnetic conductive ring, the right magnetic conductive ring and each arc-shaped core are all made of a whole piece of magnetic conductive material; the stator permanent magnet ring (3) is made of rare earth permanent magnet material.

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