Shielded electromagnetic bearing structure

Abstract

This invention relates to a shielded electromagnetic bearing structure. The invention addresses the problem that traditional electromagnetic bearings cannot withstand harsh environments such as high temperature, high pressure, and water conditions. The invention includes a stator assembly and a rotor assembly, with the stator assembly mounted on the rotor assembly. The stator assembly includes: a stator upper end cover, an eddy current position sensor, a sensor support plate, a stator housing, a stator pressure ring, a stator core, stator coils, a stator shielding sleeve, a stator slot wedge, and a stator lower support end plate. The stator upper end cover, sensor support plate, stator housing, and stator lower support end plate are connected sequentially from top to bottom. The stator pressure ring is disposed inside the stator housing. The stator core, stator coils, stator slot wedge, and stator shielding sleeve are sequentially disposed inside the stator pressure ring from the outside to the inside. The eddy current position sensor is mounted on the sensor support plate. In this invention, the rotor core, stator core, and stator coils are completely isolated from the external environment. This invention belongs to the field of bearing technology.

Description

Technical Field

[0001] This invention relates to an electromagnetic bearing, specifically a shielded electromagnetic bearing structure, and belongs to the field of bearing technology. Background Technology

[0002] Electromagnetic bearings are sliding bearings that use electric and magnetic fields to suspend the shaft. The structure of an electromagnetic bearing consists of two parts: the stator and the rotor. In traditional electromagnetic bearings, the stator core, rotor core, and coils, which are not resistant to corrosion, are directly exposed to the air. The stator and rotor are separated only by air, making them unsuitable for harsh environments such as high temperature, high pressure, and water. Summary of the Invention

[0003] To address the problem that traditional electromagnetic bearings cannot adapt to harsh environments such as high temperature, high pressure, and water, this invention proposes a shielded electromagnetic bearing structure.

[0004] The technical solution adopted by the present invention to solve the above problems is as follows:

[0005] This invention includes a stator assembly and a rotor assembly, with the stator assembly mounted on the rotor assembly. The stator assembly includes: a stator upper end cover, an eddy current position sensor, a sensor support plate, a stator housing, a stator pressure ring, a stator core, a stator coil, a stator shielding sleeve, a stator slot wedge, and a stator lower support end plate. The stator upper end cover, sensor support plate, stator housing, and stator lower support end plate are connected sequentially from top to bottom. The stator pressure ring is disposed inside the stator housing. The stator core, stator coil, stator slot wedge, and stator shielding sleeve are sequentially disposed inside the stator pressure ring from the outside to the inside. The eddy current position sensor is mounted on the sensor support plate.

[0006] Furthermore, the rotor assembly includes a rotor shielding sleeve, an upper rotor support end plate, a rotor core, a lower rotor support end plate, and a shaft. The upper rotor support end plate, the rotor core, and the lower rotor support end plate are sequentially fitted onto the shaft from top to bottom. The rotor shielding sleeve is fitted onto the outside of the rotor core. One end of the rotor shielding sleeve is welded and fixed to the upper rotor support end plate, and the other end is welded and fixed to the lower rotor support end plate.

[0007] Furthermore, the rotor core is made of silicon steel sheets stacked axially, and the rotor shielding sleeve, upper rotor support end plate, lower rotor support end plate and shaft are all made of stainless steel.

[0008] Furthermore, both the stator shielding sleeve and the rotor shielding sleeve are thin-walled annular cylinders and are made of non-magnetic stainless steel.

[0009] Furthermore, the stator core is formed by axially stacking silicon steel sheets, and the stator upper end cover, sensor support plate, stator shell, stator pressure ring, stator shielding sleeve, stator slot wedge and stator lower support end plate are all made of stainless steel.

[0010] Furthermore, the sensor support plate is provided with two through holes, the included angle between the center lines of the two through holes is 90°, and an eddy current position sensor is installed in each through hole.

[0011] Furthermore, the upper surface of the stator lower support end plate has eight support ribs in the annular groove, and the eight support ribs are evenly distributed along its circumference.

[0012] Furthermore, one end of the stator shielding sleeve is welded and fixed to the sensor support plate, and the other end of the stator shielding sleeve is welded and fixed to the lower support end plate of the stator.

[0013] The beneficial effects of this invention are:

[0014] 1. The rotor shielding sleeve can completely isolate the rotor core from the external environment, enabling it to withstand harsh environments such as high temperature, high pressure, and water environment.

[0015] 2. The stator shielding sleeve can completely isolate the stator core and stator coil from the external environment, enabling it to withstand harsh environments such as high temperature, high pressure, and water.

[0016] 3. In this invention, both the stator shielding sleeve and the rotor shielding sleeve are thin-walled annular cylinders and made of non-magnetic stainless steel, which achieves shielding protection for the fragile materials of the coil while having little impact on the magnetic circuit of the system.

[0017] 4. In this invention, the stator pressure ring and stator slot wedge are combined to strengthen the support strength and improve the pressure resistance.

[0018] 5. In this invention, eight support ribs are installed in the annular groove on the upper surface of the stator lower support end plate, which can accommodate the coil end and increase the pressure bearing capacity.

[0019] 6. The system is modularly designed. During use, simply use screws and sealing washers to seal and tighten the upper stator cover and the lower stator support end plate to the system to be used to complete the installation. Attached Figure Description

[0020] Figure 1 This is a cross-sectional assembly drawing of the present invention;

[0021] Figure 2 This is an axial sectional view of the present invention;

[0022] Figure 3 This is an exploded structural diagram of the stator component of the present invention;

[0023] Figure 4 This is an exploded structural diagram of the rotor component of the present invention.

[0024] In the figure, 1—stator upper end cover; 2—eddy current position sensor; 3—sensor support plate; 4—stator housing; 5—stator pressure ring; 6—stator core; 7—stator coil; 8—stator shielding sleeve; 9—stator slot wedge; 10—stator lower support end plate; 11—rotor shielding sleeve; 12—rotor upper support end plate; 13—rotor core; 14—rotor lower support end plate; 15—shaft. Detailed Implementation

[0025] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a shielded electromagnetic bearing structure, which includes a stator assembly and a rotor assembly. The stator assembly is mounted on the rotor assembly. The stator assembly includes: a stator upper end cover 1, an eddy current position sensor 2, a sensor support plate 3, a stator housing 4, a stator pressure ring 5, a stator core 6, a stator coil 7, a stator shielding sleeve 8, a stator slot wedge 9, and a stator lower support end plate 10. The stator upper end cover 1, sensor support plate 3, stator housing 4, and stator lower support end plate 10 are connected sequentially from top to bottom. The stator pressure ring 5 is disposed inside the stator housing 4. The stator core 6, stator coil 7, stator slot wedge 9, and stator shielding sleeve 8 are disposed sequentially from the outside to the inside inside the stator pressure ring 5. The eddy current position sensor 2 is mounted on the sensor support plate 3.

[0026] The stator housing 4 has four protruding claws inside for positioning and installing the stator core 6. Grooves are formed on both sides of the front end of the teeth of the stator core 6 for positioning and installing the stator slot wedges 9. The stator slot wedges 9 are T-shaped, with both ends fitting into the grooves of the stator core 6. Their inner diameter matches that of the stator core 6, and short support legs are provided on the upper part to limit the positioning of the stator coils 7 and support the stator shielding sleeve 8. The stator pressure ring 5 extends inward with eight claws, each claw aligning and engaging with a support leg of a stator slot wedge 9 for bearing pressure. Eight support ribs are installed in the annular groove on the upper surface of the stator lower support end plate 10, sufficient to accommodate the coil ends while increasing the pressure-bearing capacity. The stator shielding sleeve 8 is fitted onto the outside of the rotor shielding sleeve 11, cooperating with the stator core 6 and the stator slot wedges 9. Then, the upper and lower ends of the stator shielding sleeve 8 are welded to the sensor support plate and the lower stator support end plate, respectively, thereby completely sealing the stator core 6 and the stator coil 7. The upper stator end cover 1 and the sensor support plate 3 are then pressed and sealed with screws and sealing washers.

[0027] The system is modularly designed. During use, installation can be completed simply by using screws and sealing washers to seal and tighten the upper stator cover and the lower stator support end plate into the system to be used.

[0028] Specific Implementation Method Two: Combining Figures 1 to 4This embodiment describes a rotor assembly comprising a rotor shielding sleeve 11, an upper rotor support plate 12, a rotor core 13, a lower rotor support plate 14, and a shaft 15. The upper rotor support plate 12, rotor core 13, and lower rotor support plate 14 are sequentially mounted on the shaft 15 from top to bottom. The rotor shielding sleeve 11 is mounted on the outside of the rotor core 13. One end of the rotor shielding sleeve 11 is welded and fixed to the upper rotor support plate 12, and the other end is welded and fixed to the lower rotor support plate 14, thereby completely sealing the rotor core. The stator shielding sleeve 8 is mounted on the rotor shielding sleeve 11.

[0029] The other components and connections in this embodiment are the same as in Specific Embodiment 1.

[0030] Specific implementation method three: Combining Figures 1 to 4 In this embodiment, the rotor core 13 is formed by axially stacking silicon steel sheets, and the rotor shielding sleeve 11, the upper rotor support end plate 12, the lower rotor support end plate 14, and the shaft 15 are all made of stainless steel.

[0031] The other components and connections in this embodiment are the same as in specific embodiment one or two.

[0032] Specific implementation method four: Combination Figures 1 to 4 In this embodiment, both the stator shielding sleeve 8 and the rotor shielding sleeve 11 are thin-walled annular cylinders and are made of non-magnetic stainless steel.

[0033] It can shield and protect the fragile materials of the coil while having little impact on the magnetic circuit of the system.

[0034] The other components and connections in this embodiment are the same as those in specific embodiments one, two, or three.

[0035] Specific Implementation Method Five: Combining Figures 1 to 3 This embodiment describes a stator core 6 made of silicon steel sheets stacked axially. The stator upper end cover 1, sensor support plate 3, stator outer shell 4, stator pressure ring 5, stator shielding sleeve 8, stator slot wedge 9, and stator lower support end plate 10 are all made of stainless steel.

[0036] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, or four.

[0037] Specific Implementation Method Six: Combination Figure 3 In this embodiment, the sensor support plate 3 has two through holes, and the included angle between the center lines of the two through holes is 90°. An eddy current position sensor 2 is installed in each through hole.

[0038] When installing the eddy current position sensor 2, seal the two sides of the through hole with a sealing gasket and a clamping nut respectively.

[0039] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, four, or five.

[0040] Specific implementation method seven: Combination Figure 3 In this embodiment, the upper surface of the stator lower support end plate 10 is provided with eight support ribs in the annular groove, and the eight support ribs are evenly distributed along its circumference.

[0041] The eight supporting ribs not only provide sufficient support for the coil ends but also increase the load-bearing capacity.

[0042] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, four, five, or six.

[0043] Specific implementation method eight: Combination Figure 1 In this embodiment, one end of the stator shielding sleeve 8 is welded and fixed to the sensor support plate 3, and the other end of the stator shielding sleeve 8 is welded and fixed to the stator lower support end plate 10.

[0044] The stator shielding sleeve 8 is fitted onto the outside of the rotor shielding sleeve 11, and cooperates with the stator core and stator slot wedge. Then, the upper and lower ends of the stator shielding sleeve 8 are welded and fixed to the sensor support plate 3 and the lower stator support end 10, respectively, thereby completely sealing the stator core and stator coil.

[0045] The other components and connections in this embodiment are the same as those in specific embodiments one, two, three, four, five, six, or seven.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A shielded electromagnetic bearing structure comprising a stator assembly and a rotor assembly, the stator assembly being nested within the rotor assembly, characterised in that: The stator assembly includes a stator upper end cover (1), an eddy current position sensor (2), a sensor support plate (3), a stator housing (4), a stator pressure ring (5), a stator core (6), a stator coil (7), a stator shield (8), a stator slot wedge (9), and a stator lower support end plate (10). The stator upper end cover (1), the sensor support plate (3), the stator housing (4), and the stator lower support end plate (10) are connected sequentially from top to bottom. The stator pressure ring (5) is located inside the stator housing (4). The stator core (6), the stator coil (7), the stator slot wedge (9), and the stator shield (8) are sequentially located inside the stator pressure ring (5) from the outside to the inside. The eddy current position sensor (2) is mounted on the sensor support plate (3). The rotor assembly includes a rotor shielding sleeve (11), an upper rotor support end plate (12), a rotor core (13), a lower rotor support end plate (14), and a shaft (15). The upper rotor support end plate (12), the rotor core (13), and the lower rotor support end plate (14) are sequentially fitted onto the shaft (15) from top to bottom. The rotor shielding sleeve (11) is fitted onto the outside of the rotor core (13). One end of the rotor shielding sleeve (11) is welded and fixed to the upper rotor support end plate (12), and the other end is welded and fixed to the lower rotor support end plate (14). The stator shielding sleeve (8) is fitted onto the rotor shielding sleeve (11). The stator shielding sleeve (8) and the rotor shielding sleeve (11) are both thin-walled annular cylinders and are made of non-magnetic stainless steel. The upper surface of the stator lower support end plate (10) has eight support ribs in the annular groove, and the eight support ribs are evenly distributed along its circumference. One end of the stator shielding sleeve (8) is welded and fixed to the sensor support plate (3), and the other end of the stator shielding sleeve (8) is welded and fixed to the stator lower support end plate (10).

2. The shielded electromagnetic bearing structure according to claim 1, characterized in that: The rotor core (13) is made of silicon steel sheets stacked axially. The rotor shielding sleeve (11), the upper support plate (12), the lower support plate (14), and the shaft (15) are all made of stainless steel.

3. The shielded electromagnetic bearing structure according to claim 1, characterized in that: The stator core (6) is made of silicon steel sheets stacked axially. The stator upper end cover (1), sensor support plate (3), stator shell (4), stator pressure ring (5), stator shielding sleeve (8), stator slot wedge (9) and stator lower support end plate (10) are all made of stainless steel.

4. The shielded electromagnetic bearing structure according to claim 1, characterized in that: The sensor support plate (3) has two through holes, and the included angle between the center lines of the two through holes is 90°. An eddy current position sensor (2) is installed in each through hole.

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