Hybrid Bearing-Structured Turbo Motor

Abstract

A turbo motor having a disclosed hybrid bearing structure includes a first bearing housing that supports one end of a rotor on which an impeller is installed, and a second bearing housing that supports the other end of a rotor on which a cooling fan is installed. A first and second bearing assembly, each comprising a combination of a magnetic bearing and an air foil bearing, is installed in the first and second bearing housings, respectively.

Description

Technology Field

[0001] The present invention relates to a turbo motor, and more specifically, to a turbo motor having a hybrid bearing structure combining a magnetic bearing and an air foil bearing. Background Technology

[0002] In this invention, background technology is provided, and this does not necessarily mean known technology.

[0003] Turbo motors play a key role in various advanced technology fields requiring high-speed rotation and high output, such as industrial compressors, blowers, and air supply units for hydrogen fuel cells.

[0004] These turbo motors primarily feature a structure combining magnetic bearings and ball bearings; in this configuration, the magnetic bearing acts as the primary bearing, while the ball bearing performs only a simple auxiliary stopping function to prevent the shaft from falling in the event of a magnetic bearing failure.

[0005] Therefore, there was a problem in that if a magnetic bearing failed, the turbo motor would stop immediately and become unrecoverable, requiring rapid repairs and making backup operation impossible. This significantly reduced the operational continuity of the equipment.

[0006] In addition, when using only air foil bearings in large-capacity turbo motors, there was a problem where durability was weakened because they could not withstand the load of heavy shafts. Prior art literature

[0007] Korean Patent Publication No. 10-2024-0160839. The problem to be solved

[0008] The present invention aims to provide a turbo motor having a hybrid bearing structure that can increase the stability and reliability of a turbo motor by ensuring the continuity of operation of the turbo motor even in the event of magnetic bearing failure and improving the durability of a large-capacity motor through a hybrid bearing structure combining a magnetic bearing and an air foil bearing. means of solving the problem

[0009] A general summary of the invention is provided herein, and this should not be understood as limiting the scope of the invention.

[0010] In order to solve the above-mentioned problem, according to one aspect of the various aspects describing the present invention, a turbo motor comprising a first bearing housing supporting one end of a rotor on which an impeller is installed and a second bearing housing supporting the other end of a rotor on which a cooling fan is installed, wherein the first and second bearing housings may each be equipped with a first and second bearing assembly in which a magnetic bearing and an air foil bearing are combined.

[0011] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, the first bearing assembly may include: a first magnetic journal bearing that primarily supports a radial load on one end side of a rotor; a first air foil journal bearing that primarily supports a radial load on one end side of a rotor when a failure occurs in the first magnetic journal bearing; and a first magnetic position sensor installed adjacent to the first magnetic journal bearing to detect the position on one end side of the rotor in real time and control the magnetic force of the first magnetic journal bearing.

[0012] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, the second bearing assembly may include: a magnetic thrust bearing that primarily supports an axial load on the other end side of the rotor; an air foil thrust bearing that primarily supports an axial load on the other end side of the rotor when a failure occurs in the magnetic thrust bearing; a second magnetic journal bearing that primarily supports a radial load on the other end side of the rotor when a failure occurs in the second magnetic journal bearing; a second air foil journal bearing that primarily supports a radial load on the other end side of the rotor when a failure occurs in the second magnetic journal bearing; and a second magnetic position sensor installed between the magnetic thrust bearing and the second magnetic journal bearing to detect the position of the other end side of the rotor in real time and control the magnetic force of the magnetic thrust bearing and the second magnetic journal bearing.

[0013] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, magnetic thrust bearings may be provided in pairs so as to support the axial load of the rotor in both directions.

[0014] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, the magnetic thrust bearing may be installed at a position spaced apart from the impeller where significant thermal expansion occurs.

[0015] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, the turbo motor may have a spiral cooling passage formed concavely extending from one end of the core to the other end on the inner circumference of the core of the stator.

[0016] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, a helical cooling passage may be formed to have a twist angle of 3 degrees with respect to the axial direction of the rotor.

[0017] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, at least one spiral cooling passage may be formed on the inner circumference of the core.

[0018] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, a spiral cooling passage can be formed in one turn along the inner surface of the core.

[0019] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, a spiral cooling passage may be formed such that its depth or width gradually expands toward one end of the rotor.

[0020] In a turbo motor having a hybrid bearing structure according to one aspect of the present invention, a protrusion may be formed on one side of a spiral cooling passage. Effects of the invention

[0021] According to the present invention, since the air foil bearing automatically performs an auxiliary function in the event of a magnetic bearing failure, it provides the effect of enabling restart and limited operation without immediately stopping.

[0022] Due to these effects, not only can driving time be secured until repairs are completed, but the stability and reliability of the turbo motor can also be significantly improved.

[0023] According to the present invention, since the magnetic bearing performs the role of the main bearing and the air foil bearing assists, it is possible to improve the durability of a large-capacity turbo motor and also provide the effect of enabling continuous operation.

[0024] According to the present invention, continuous operation is possible even in the event of a failure, and the effect of extending the life of the bearing is provided. Brief explanation of the drawing

[0025] FIG. 1 is a schematic diagram showing a turbo motor having a hybrid bearing structure according to the present invention. FIG. 2 is a disassembled view of the hybrid bearing structure illustrated in FIG. 1. Specific details for implementing the invention

[0026] Hereinafter, an embodiment of a turbo motor having a hybrid bearing structure according to the present invention will be described in detail with reference to the following.

[0027] FIGS. 1 and FIGS. 2 are schematic drawings of a turbo motor having a hybrid bearing structure according to the present invention.

[0028] Referring to FIGS. 1 and 2, the turbo motor related to the present invention includes a case (10), a stator (20) installed inside the case (10), and a rotor (30) rotatably installed inside the stator (20).

[0029] Additionally, the turbo motor related to the present invention further includes a first bearing housing (40) and a second bearing housing (50) that support one end and the other end of the rotor (30), and the first and second bearing housings (40, 50) are each coupled to one end and the other end of the case (10).

[0030] At this time, an impeller (32) is installed at one end of the rotor (30) supported through the first bearing housing (40), and a cooling fan (34) is installed at the other end of the rotor (30) supported through the second bearing housing (50).

[0031] Meanwhile, the rotor (30) of the turbo motor according to the present invention is stably supported by first and second bearing assemblies (44, 56) respectively installed inside the first and second bearing housings (40, 50).

[0032] The first bearing assembly (44) includes a first magnetic journal bearing (41) and a first air foil journal bearing (43).

[0033] The first magnetic journal bearing (41) primarily supports the radial load on one side of the rotor (30), and a first magnetic position sensor (42) is installed on one side of the first magnetic journal bearing (41) facing the impeller (32).

[0034] The first magnetic position sensor (42) detects the position of one end of the rotating rotor (30) in real time so that the magnetic force of the first magnetic journal bearing (41) is finely adjusted so that the one end of the rotor (30) is always stably maintained in the center.

[0035] The first air foil journal bearing (43) is installed facing the impeller (32) with the first magnetic journal bearing (41) in between.

[0036] This first air foil journal bearing (43) normally supports the radial load on one side of the rotor (30) together with the first magnetic journal bearing (41) in an auxiliary manner, and in the event of failure of the first magnetic journal bearing (41), it supports the radial load on one side of the rotor (30) in a dominant manner to ensure the continuous operation of the turbo motor.

[0037] The second bearing assembly (56) includes a magnetic thrust bearing (51), a second magnetic journal bearing (52), an air foil thrust bearing (54), and a second air foil journal bearing (55).

[0038] The magnetic thrust bearings (51) primarily support the axial load on the other end of the rotor (30) and are provided in pairs to support the axial load of the rotor (30) in both directions.

[0039] Here, the magnetic thrust bearing (51) is installed adjacent to the cooling fan (34) to minimize the effect of thermal expansion by separating it from the impeller (32), where a lot of thermal expansion occurs.

[0040] The second magnetic journal bearing (52) is installed adjacent to the magnetic thrust bearing (51) and primarily supports the radial load on the other end of the rotor (30).

[0041] At this time, a second magnetic position sensor (53) is installed between the magnetic thrust bearing (51) and the second magnetic journal bearing (52). The second magnetic position sensor (53) detects the position of the other end of the rotating rotor (30) in real time and finely adjusts the magnetic force of the magnetic thrust bearing (51) and the second magnetic journal bearing (52), thereby ensuring that the other end of the rotor (30) is always stably maintained in the center.

[0042] The air foil thrust bearing (54) is installed between the magnetic thrust bearing (51) and the second magnetic position sensor (53).

[0043] The air foil thrust bearing (54) normally supports the axial load in an auxiliary manner together with the magnetic thrust bearing (51), and in the event of a failure of the magnetic thrust bearing (51), it supports the axial load primarily to ensure continuous operation.

[0044] The second air foil journal bearing (55) is installed facing the second magnetic position sensor (53) with the second magnetic journal bearing (52) in between.

[0045] The second air foil journal bearing (55) normally supports the radial load in an auxiliary manner together with the second magnetic journal bearing (52), but when the second magnetic journal bearing (52) fails, it supports the radial load primarily to ensure the continuous operation of the turbo motor.

[0046] Meanwhile, on the inner surface of the core (22) of the stator (20) of the turbo motor according to the present invention, a spiral cooling passage (24) is formed to extend concavely from one end of the core (22) to the other end.

[0047] The spiral cooling passage (28) allows cooling air flowing between the inner surface of the core (22) and the outer surface of the rotor (30) to be introduced while forcibly pushing it in the axial direction of the rotor (30) when the rotor (30) rotates. This increases the flow rate of the cooling air, thereby allowing the heat of the stator (20), rotor (30), first bearing assembly (44), and second bearing assembly (56) of the turbo motor exposed to high temperatures to be quickly and effectively discharged.

[0048] These spiral cooling passages (24) are formed to have a twist angle of 3 degrees with respect to the axial direction of the rotor (20). If the twist angle is less than 3 degrees, the flow of cooling air is minimal, and if it exceeds 3 degrees, it may cause noise and vibration.

[0049] Additionally, at least one spiral cooling passage (24) is formed on the inner circumference of the core (22), and when two or more are formed, they can be formed in parallel so as not to interfere with each other.

[0050] And the spiral cooling passage (24) can be formed in one turn along the inner surface of the core (22) of the stator (20) so as to minimize pressure loss of cooling air.

[0051] Furthermore, the spiral cooling passage (24) may be formed such that its depth or width gradually expands toward one end of the rotor (30) where significant thermal expansion occurs, and a protrusion (not shown) may be formed at one end of the spiral cooling passage (24) to disturb the outflowing cooling air and form a vortex.

[0052] In the present invention formed in this manner, the first magnetic journal bearing (41), the magnetic thrust bearing (51), and the second magnetic journal bearing (52) normally support the rotor (30) and rotate in a non-contact state under control by the first and second magnetic position sensors (42, 53).

[0053] And when fixation occurs in the first magnetic journal bearing (41), magnetic thrust bearing (51) and the second magnetic journal bearing (52), the first air foil journal bearing (43), air foil thrust bearing (54), and the second air foil journal bearing (55) respectively automatically support the rotor (30) using an air film, thereby enabling the turbo motor to restart and operate in a limited manner without stopping immediately.

[0054] It is stated that the essential technical concept of the present invention is not limited to the embodiments described above, and encompasses a scope that can be easily proposed by a person skilled in the art through substitution or modification.

[0055] Furthermore, since the terms used in the description of the present invention are selected for the convenience of explanation, in grasping the essential technical concept of the present invention, they should not be limited to their dictionary meanings but should be appropriately interpreted in a sense consistent with the technical concept of the present invention.

Claims

Claim 1 A turbo motor comprising a first bearing housing supporting one end of a rotor on which an impeller is installed, and a second bearing housing supporting the other end of the rotor on which a cooling fan is installed, wherein the first and second bearing housings are equipped with first and second bearing assemblies, respectively, wherein the first bearing assembly comprises: a first magnetic journal bearing that primarily supports a radial load on one end of the rotor; a first air foil journal bearing that primarily supports a radial load on one end of the rotor when a failure occurs in the first magnetic journal bearing; and a first magnetic position sensor installed adjacent to the first magnetic journal bearing to detect the position of one end of the rotor in real time and control the magnetic force of the first magnetic journal bearing; and the second bearing assembly comprises a magnetic thrust bearing that primarily supports an axial load on the other end of the rotor. An air foil thrust bearing that primarily supports the axial load on the other end side of the rotor when a failure occurs in the magnetic thrust bearing; a second magnetic journal bearing that primarily supports the radial load on the other end side of the rotor when a failure occurs in the second magnetic journal bearing; a second air foil journal bearing that primarily supports the radial load on the other end side of the rotor when a failure occurs in the second magnetic journal bearing; and a second magnetic position sensor installed between the magnetic thrust bearing and the second magnetic journal bearing to detect the position on the other end side of the rotor in real time and control the magnetic force of the magnetic thrust bearing and the second magnetic journal bearing;A turbo motor having a hybrid bearing structure comprising: a helical cooling passage formed concavely extending from one end to the other end of the core on the inner circumference of the core of the stator; the helical cooling passage formed to have a twist angle of 3 degrees with respect to the axial direction of the rotor; and the helical cooling passage formed to gradually expand in depth or width toward one end of the rotor. Claim 2 delete Claim 3 delete Claim 4 A turbo motor according to claim 1, wherein the magnetic thrust bearing is provided in pairs to support the axial load of the rotor in both directions, having a hybrid bearing structure. Claim 5 A turbo motor according to claim 1, wherein the magnetic thrust bearing has a hybrid bearing structure installed at a position spaced apart from the impeller where thermal expansion occurs. Claim 6 delete Claim 7 delete Claim 8 A turbo motor according to claim 1, wherein the spiral cooling passage is formed at least one on the inner circumference of the core and has a hybrid bearing structure. Claim 9 A turbo motor according to claim 1, wherein the spiral cooling passage is formed in one turn along the inner circumferential surface of the core, having a hybrid bearing structure. Claim 10 delete Claim 11 A turbo motor having a hybrid bearing structure in which a protrusion is formed on one side of the spiral cooling passage according to claim 1.

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