Magnetic powder damper

Abstract

The embodiments of the present application provide a magnetic powder damper. The magnetic powder damper can include a first stator, a second stator, a rotor and magnetic powder. The first stator includes a first stator inner end face facing the rotor, the second stator includes a second stator inner end face facing the rotor, and the rotor includes a first rotor end face and a second rotor end face. At least one of the first stator inner end face, the second stator inner end face, the first rotor end face and the second rotor end face is provided with a magnetic powder groove, and the magnetic powder can fall into the magnetic powder groove. The magnetic powder groove provided by the present application can accommodate the magnetic powder. In one aspect, the friction between the magnetic powder and the stator and / or the rotor can be increased, and the friction torque can be increased. In another aspect, the magnetic powder groove can increase the magnetic field strength because it can accommodate the magnetic powder, thereby increasing the friction torque.

Description

Technical Field

[0001] This application relates to dampers, and more particularly to magnetic powder dampers. Background Technology

[0002] Magnetic powder dampers (magnetic powder brakes) utilize the fact that when a coil is energized, the magnetic powder between the stator and rotor forms a powder chain, thereby generating a frictional torque between the stator and rotor. For example... Figure 1 As shown, a magnetic powder damper known to the inventors includes an upper stator 810, a lower stator 820, a rotor 830, a coil 840, an upper bearing 850, a lower bearing 860, and a shaft 870. Magnetic powder is disposed between the stator and the rotor 830.

[0003] Among them, the side of the upper stator 810 facing the rotor 830, the side of the lower stator 820 facing the rotor 830, and the two end faces of the rotor 830 are all flat, with low friction coefficient and low friction torque generated by magnetic powder.

[0004] In addition, the upper bearing 850 and the lower bearing 860 are made of metal ball bearings, which are magnetic and can easily cause magnetic leakage, resulting in low efficiency of the magnetic powder damper. Summary of the Invention

[0005] To address or mitigate at least one of the problems mentioned in the background art, this application provides a magnetic powder damper.

[0006] The magnetic particle damper provided in this application includes a first stator, a second stator, a rotor, and magnetic powder. The rotor is disposed between the first stator and the second stator, and the magnetic powder is disposed between the first stator and the rotor, and between the second stator and the rotor.

[0007] The first stator includes a first stator inner end face facing the rotor, the second stator includes a second stator inner end face facing the rotor, and the rotor includes a first rotor end face and a second rotor end face.

[0008] At least one of the first stator inner end face, the second stator inner end face, the first rotor end face, and the second rotor end face is provided with a magnetic powder groove, and the magnetic powder can fall into the magnetic powder groove.

[0009] In at least one embodiment, the magnetic powder groove is formed as an annular groove extending circumferentially in the circumferential direction of the magnetic powder damper.

[0010] In at least one embodiment, the magnetic powder groove is formed as a plurality of concentric annular grooves.

[0011] In at least one embodiment, the magnetic powder groove is formed as a plurality of grooves arranged in a circumferential array around the axis of the magnetic powder damper, the plurality of grooves extending circumferentially or radially along the magnetic powder damper.

[0012] In at least one embodiment, the inner end face of the first stator and the inner end face of the second stator are respectively provided with an equal number of magnetic powder grooves, the positions of which are symmetrical about the rotor.

[0013] In at least one embodiment, the number of magnetic powder grooves on the inner end face of the first stator differs from the number of magnetic powder grooves on the inner end face of the second stator, and / or their positions are asymmetrical.

[0014] In at least one embodiment, the first rotor end face and the second rotor end face are respectively provided with an equal number of magnetic powder grooves, the positions of which are symmetrical about the cross-section passing through the center of the rotor.

[0015] In at least one embodiment, the number of magnetic powder grooves on the first rotor end face differs from that on the second rotor end face, and / or their positions are asymmetrical.

[0016] In at least one embodiment, the magnetic powder damper further includes a coil disposed radially outside the rotor, and magnets are disposed on the inner end face of the first stator and / or the inner end face of the second stator, such that the magnetic powder can be attracted to the magnets after the coil is de-energized.

[0017] The distance between the magnet and the first rotor end face is greater than the distance between the inner end face of the first stator and the first rotor end face, and / or

[0018] The distance A between the magnet and the end face of the second rotor is greater than the distance B between the inner end face of the second stator and the end face of the second rotor.

[0019] In at least one embodiment, the magnetic powder damper further includes a first bearing and a second bearing, the first bearing and the second bearing being respectively mounted on the first stator and the second stator, and the first bearing and the second bearing being bearings with magnetic shielding effect.

[0020] The magnetic powder trough provided in this application can accommodate magnetic powder. On the one hand, it can increase the frictional force between the magnetic powder and the stator and / or rotor, thereby increasing the frictional torque. On the other hand, because the magnetic powder trough can accommodate magnetic powder, it can increase the magnetic field strength, thereby increasing the frictional torque. Attached Figure Description

[0021] Figure 1 A cross-sectional view of a magnetic powder damper known to the inventor is shown.

[0022] Figure 2 A cross-sectional view of a magnetic powder damper according to an embodiment of this application is shown.

[0023] Figure 3It shows Figure 2 An isometric view of the first stator of the magnetic powder damper, wherein the inner end face of the first stator faces upward.

[0024] Figure 4 It shows Figure 2 An isometric view of the second stator of the magnetic powder damper, with the inner end face of the second stator facing upwards.

[0025] Figure 5 A cross-sectional view of a magnetic powder damper according to another embodiment of this application is shown.

[0026] Figure 6 It shows Figure 5 The image shows an isometric view of the rotor of the magnetic powder damper, with the first rotor end face facing upwards.

[0027] Figure 7 It shows Figure 5 The image shows an isometric view of the rotor of the magnetic powder damper, with the second rotor end face facing upwards.

[0028] Explanation of reference numerals in the attached figures

[0029] 110 First Stator

[0030] 111 Inner end surface of the first stator

[0031] 120 Second Stator

[0032] 121 Second stator inner end face

[0033] 200 rotor

[0034] 210 First rotor end face

[0035] 220 Second rotor end face

[0036] 300 magnetic powder

[0037] 400 Magnetic Powder Basket

[0038] 500 coil

[0039] 600 magnets

[0040] 710 First Bearing

[0041] 720 Second Bearing

[0042] 730 axis

[0043] 810 Upper Stator

[0044] 820 Make up your mind

[0045] 830 rotor

[0046] 840 coil

[0047] 850 upper bearing

[0048] 860 lower bearing

[0049] 870 axis Detailed Implementation

[0050] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0051] This application provides a magnetic powder damper.

[0052] See Figure 2 , Figure 5 The magnetic powder damper may include a first stator 110, a second stator 120, a rotor 200, and magnetic powder 300. The rotor 200 is disposed between the first stator 110 and the second stator 120, and the magnetic powder 300 is disposed between the first stator 110 and the rotor 200, and between the second stator 120 and the rotor 200.

[0053] Furthermore, the first stator 110 includes a first stator inner end face 111 facing the rotor 200, the second stator 120 includes a second stator inner end face 121 facing the rotor 200, and the rotor 200 includes a first rotor end face 210 and a second rotor end face 220. At least one of the first stator inner end face 111, the second stator inner end face 121, the first rotor end face 210, and the second rotor end face 220 is provided with a magnetic powder groove 400, into which magnetic powder 300 can fall.

[0054] More specifically, see Figures 2 to 4 Magnetic powder grooves 400 can be provided on the inner end face 111 of the first stator and the inner end face 121 of the second stator. See also Figures 5 to 7 Magnetic powder grooves 400 can also be provided on the first rotor end face 210 and the second rotor end face 220. Of course, magnetic powder grooves 400 can also be provided on all four faces, or on one or more of the four faces.

[0055] It should be understood that after the coil 500 (described later) is energized, the magnetic powder 300 can form a magnetic powder chain under the action of the magnetic field, thereby generating a frictional torque between the stator and the rotor. The magnetic powder groove 400 provided in this application can accommodate the magnetic powder 300, which on the one hand increases the frictional force between the magnetic powder 300 and the stator and rotor, thereby increasing the frictional torque. On the other hand, the magnetic powder 300 in the magnetic powder groove 400 can also increase the magnetic field strength, thereby increasing the frictional torque.

[0056] In one implementation, see Figure 3 The magnetic powder tank 400 can be formed as a ring tank. The magnetic powder tank 400 can be formed as multiple concentric ring tanks. Of course, it can also be formed as a single ring tank. It should be understood that this application does not limit the number of tanks.

[0057] In one embodiment, not shown in the figures, the magnetic powder groove 400 is formed as a plurality of grooves arranged in a circumferential array around the axis of the magnetic powder damper, and these grooves may extend, for example, circumferentially or radially. Of course, the magnetic powder groove 400 can also be formed as grooves of other shapes.

[0058] Relatively speaking, the annular grooves and the multiple grooves arranged in a circumferential array around the axis of the magnetic powder damper are beneficial for balancing the frictional torque transmitted by the magnetic powder 300, making the magnetic powder damper more stable. However, it should be understood that this application does not limit the shape of the grooves.

[0059] In one implementation, see Figures 2 to 4 The inner end face 111 of the first stator and the inner end face 121 of the second stator are respectively provided with an equal number of magnetic powder grooves 400, which are symmetrically positioned with respect to the rotor 200. The magnetic powder grooves 400 can be formed as annular grooves. Of course, it can also be configured such that the number of magnetic powder grooves 400 on the inner end face 111 of the first stator differs from that on the inner end face 121 of the second stator, and / or their positions are asymmetrical.

[0060] In one embodiment, the first rotor end face 210 and the second rotor end face 220 are respectively provided with an equal number of magnetic powder grooves 400, whose positions are symmetrical about the cross-section passing through the center of the rotor 200. Alternatively, it can be configured as follows: [See...] Figures 5 to 7 The number of magnetic powder grooves 400 on the first rotor end face 210 differs from that on the second rotor end face 220, and / or their positions are asymmetrical. The magnetic powder grooves 400 can also be formed as annular grooves. However, it should be understood that this application does not limit the symmetrical relationship of the positions of the magnetic powder grooves 400.

[0061] In one implementation, see Figure 2 , Figure 5 The magnetic powder damper also includes a coil 500 disposed radially outside the rotor 200, and magnets 600 disposed on the inner end face 111 of the first stator and / or the inner end face 121 of the second stator, so that the magnetic powder 300 can be attracted to the magnets 600 after the coil 500 is de-energized. Consequently, after the coil 500 is de-energized, the frictional torque generated at the magnetic powder groove 400 is close to zero, and the rotor 200 can rotate normally under the drive of the shaft 730 (described later).

[0062] Furthermore, such as Figure 2 , Figure 5As shown, magnet 600 can be positioned at the center of the first stator 110 and the second stator 120 (e.g., shaft 730 can pass through magnet 600). The distance A between magnet 600 and the second rotor end face 220 can be greater than the distance B between the inner end face 121 of the second stator and the second rotor end face 220. And / or, the distance between magnet 600 and the first rotor end face 210 is greater than the distance between the inner end face 111 of the first stator and the first rotor end face 210 (not shown in the figure). That is, a groove can be formed at the magnet to prevent magnetic powder 300 from accumulating after being attracted to magnet 600 and affecting the rotation of rotor 200.

[0063] For example, the size of the magnetic powder trough 400 can be relatively small. For instance, the circumferential width (or width) of a single magnetic powder trough 400 can be no more than 3% of the diameter of the rotor 200. Or, viewed axially, the area of ​​a single magnetic powder trough 400 can be no more than 5% of the area of ​​the rotor 200.

[0064] In one embodiment, the magnetic powder damper further includes a first bearing 710, a second bearing 720, and a shaft 730. The first bearing 710 and the second bearing 720 are respectively mounted on the first stator 110 and the second stator 120. The first bearing 710 and the second bearing 720 are bearings with magnetic shielding effects, such as ceramic bearings. Compared to conventional metal bearings with high magnetic permeability, these bearings with magnetic shielding effects have low magnetic permeability, which can reduce magnetic leakage and thus provide higher frictional torque and improve efficiency.

[0065] Shaft 730 is connected to rotor 200, first bearing 710 and second bearing 720. More specifically, shaft 730 is rotatably connected to first stator 110 and second stator 120 via first bearing 710 and second bearing 720 respectively, and shaft 730 is fixedly connected to rotor 200. By energizing coil 500, magnetic powder 300 restricts the rotation of rotor 200, thereby restricting the rotation of shaft 730.

[0066] Overall, the magnetic powder damper provided in this application has a simple structure, low cost, and is beneficial for improving frictional torque and efficiency.

[0067] The above description is the preferred embodiment of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A magnetic powder damper, comprising a first stator (110), a second stator (120), a rotor (200), and magnetic powder (300), wherein the rotor (200) is disposed between the first stator (110) and the second stator (120), and the magnetic powder (300) is disposed between the first stator (110) and the rotor (200), and between the second stator (120) and the rotor (200), characterized in that, The first stator (110) includes a first stator inner end face (111) facing the rotor (200), the second stator (120) includes a second stator inner end face (121) facing the rotor (200), and the rotor (200) includes a first rotor end face (210) and a second rotor end face (220). At least one of the first stator inner end face (111), the second stator inner end face (121), the first rotor end face (210), and the second rotor end face (220) is provided with a magnetic powder groove (400), and the magnetic powder (300) can fall into the magnetic powder groove (400).

2. The magnetic powder damper according to claim 1, characterized in that, The magnetic powder groove (400) is formed as an annular groove extending circumferentially in the circumferential direction of the magnetic powder damper.

3. The magnetic powder damper according to claim 2, characterized in that, The magnetic powder groove (400) is formed as a plurality of concentric annular grooves.

4. The magnetic powder damper according to claim 1, characterized in that, The magnetic powder groove (400) is formed as a plurality of grooves arranged in a circumferential array around the axis of the magnetic powder damper, and the plurality of grooves extend along the circumferential or radial direction of the magnetic powder damper.

5. The magnetic powder damper according to claim 1, characterized in that, The first stator inner end face (111) and the second stator inner end face (121) are respectively provided with an equal number of magnetic powder grooves (400) and their positions are symmetrical about the rotor (200).

6. The magnetic powder damper according to claim 1, characterized in that, The number of magnetic powder grooves (400) on the inner end face (111) of the first stator differs from the number of magnetic powder grooves (400) on the inner end face (121) of the second stator, and / or their positions are asymmetrical.

7. The magnetic powder damper according to claim 1, characterized in that, The first rotor end face (210) and the second rotor end face (220) are respectively provided with an equal number of magnetic powder grooves (400) whose positions are symmetrical about the cross-section passing through the center of the rotor (200).

8. The magnetic powder damper according to claim 1, characterized in that, The number of magnetic powder grooves (400) on the first rotor end face (210) differs from that on the second rotor end face (220), and / or their positions are asymmetrical.

9. The magnetic powder damper according to claim 1, characterized in that, The magnetic powder damper further includes a coil (500) disposed radially outside the rotor (200), and magnets (600) are disposed on the inner end face (111) of the first stator and / or the inner end face (121) of the second stator, so that the magnetic powder (300) can be attracted to the magnets (600) after the coil (500) is de-energized. The distance between the magnet (600) and the first rotor end face (210) is greater than the distance between the first stator inner end face (111) and the first rotor end face (210), and / or The distance A between the magnet (600) and the second rotor end face (220) is greater than the distance B between the second stator inner end face (121) and the second rotor end face (220).

10. The magnetic powder damper according to claim 1, characterized in that, The magnetic powder damper further includes a first bearing (710) and a second bearing (720), the first bearing (710) and the second bearing (720) being respectively mounted on the first stator (110) and the second stator (120), and the first bearing (710) and the second bearing (720) being bearings with magnetic shielding effect.

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