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CN-116085388-B - Electromagnetic bearing rotor system and air compressor

CN116085388BCN 116085388 BCN116085388 BCN 116085388BCN-116085388-B

Abstract

The electromagnetic bearing rotor system comprises a rotating shaft, a radial magnetic bearing, an axial magnetic bearing and an auxiliary bearing, wherein the radial magnetic bearing is sleeved on the rotating shaft and used for supporting radial load of the rotating shaft, the axial magnetic bearing is sleeved on the rotating shaft and used for supporting axial load of the rotating shaft, the auxiliary bearing is sleeved on the rotating shaft by adopting an angular contact sliding bearing as the auxiliary bearing, the auxiliary bearing comprises a bearing outer ring and a bearing inner ring, the bearing inner ring is arranged in the bearing outer ring, and the bearing inner ring is matched with the conical surface of the bearing outer ring, so that the auxiliary bearing can provide radial and axial support for the rotating shaft when the radial magnetic bearing and/or the axial magnetic bearing fail, and meanwhile, a ceramic metal composite coating is arranged on the inner surface of the bearing outer ring and/or the outer surface of the bearing inner ring so as to prevent the bearing outer ring and the bearing inner ring from seriously wearing the ground surface, and the impact effect is caused on the whole electromagnetic bearing rotor system.

Inventors

  • GUO YUCHEN
  • LI XIAOLEI
  • WU DEMIN

Assignees

  • 季华实验室

Dates

Publication Date
20260508
Application Date
20230216

Claims (7)

  1. 1. An air compressor machine, includes the casing and locates electromagnetic bearing rotor system in the casing, its characterized in that, electromagnetic bearing rotor system includes: a rotating shaft (1); the radial magnetic bearing (2) is sleeved on the rotating shaft (1) and used for supporting the radial load of the rotating shaft (1); the axial magnetic bearing (3) is sleeved on the rotating shaft (1) and used for supporting the axial load of the rotating shaft (1); The auxiliary bearing (4) is an angular contact sliding bearing, the auxiliary bearing (4) is sleeved on the rotating shaft (1), the auxiliary bearing (4) comprises a bearing outer ring (401) and a bearing inner ring (402) which are independently arranged, the bearing inner ring (402) is arranged in the inner surface of the bearing outer ring (401), the outer surface of the bearing inner ring (402) is matched with the conical surface of the inner surface of the bearing outer ring (401), a ceramic metal composite coating (403) is arranged on the inner surface of the bearing outer ring (401) and/or the outer surface of the bearing inner ring (402), and the auxiliary bearing (4) is used for providing radial and axial support for the rotating shaft (1) when the radial magnetic bearing (2) and/or the axial magnetic bearing (3) fail; The bearing inner ring (402) is fixedly connected with the rotating shaft (1), the bearing outer ring (401) is fixedly connected with the static outer sleeve, the static outer sleeve comprises static parts fixedly connected with the machine shell, the number of the auxiliary bearings (4) is two, and the two auxiliary bearings (4) are respectively arranged at two ends of the rotating shaft (1).
  2. 2. The air compressor of claim 1, wherein the ceramic metal composite coating (403) is a Cr3C2-25% nicr ceramic metal composite coating.
  3. 3. The air compressor of claim 1, wherein the ceramic metal composite coating (403) has a thickness of 100 μιη to 300 μιη.
  4. 4. An air compressor according to any one of claims 1 to 3, wherein the radial magnetic bearing (2) comprises a radial stator and a radial rotor, the radial rotor being sleeved on the rotating shaft (1), the radial stator having a plurality of poles, each pole being wound with a coil winding for regulating the radial rotor in balance by electromagnetic force.
  5. 5. An air compressor according to any one of claims 1 to 3, wherein the axial magnetic bearing (3) comprises an axial stator and an axial rotor, the axial rotor is sleeved on the rotating shaft (1), the axial stator comprises two annular electromagnets with annular grooves, annular coil windings for regulating the balance of the axial rotor through electromagnetic force are arranged in the annular grooves, and the two annular electromagnets are coaxially arranged on two sides of the axial rotor.
  6. 6. An air compressor according to any one of claims 1 to 3, further comprising a position sensor (5) and a controller (6); The position sensor (5) is coaxially arranged with the rotating shaft (1) and is provided with a gap with the rotating shaft (1) and is used for determining the axial position and the radial position of the rotating shaft (1), and the position sensor (5) is connected with the radial magnetic bearing (2) and the axial magnetic bearing (3); The controller (6) is electrically connected with the position sensor (5) and is used for receiving feedback of the position sensor (5), and the controller (6) is electrically connected with the radial magnetic bearing (2) and the axial magnetic bearing (3) so as to control the force application of the radial magnetic bearing (2) and/or the axial magnetic bearing (3).
  7. 7. An air compressor according to any one of claims 1 to 3, further comprising a motor, wherein the motor comprises a motor stator and a motor rotor, the motor stator is fixed on the casing, the motor rotor is rotatably arranged in the motor stator and is concentrically arranged with the motor stator, a shaft hole is formed in the center of the motor rotor, and the rotating shaft (1) is arranged in the shaft hole in a penetrating manner and is fixedly connected with the shaft hole so as to drive the rotating shaft (1) to rotate.

Description

Electromagnetic bearing rotor system and air compressor Technical Field The disclosure relates to the technical field of magnetic suspension, in particular to an electromagnetic bearing rotor system and an air compressor. Background The electromagnetic bearing supported high-speed rotor system is intended to be applied to a fuel cell automobile air compressor, and the principle of the fuel cell automobile air compressor is that an impeller drives gas to rotate at a high speed so as to enable the gas to generate centrifugal force, thereby improving the flow rate and pressure of the gas after passing through the impeller and continuously producing compressed air. Therefore, the centrifugal impeller is taken as a main component of the rotor system of the air compressor, and the design quality of the centrifugal impeller has a crucial influence on the performance of the air compressor. In the existing air compressor, when the electromagnetic bearing fails or loses power, the auxiliary bearing only plays a supporting role and cannot bear axial force and radial force generated in the rotation process of the rotating shaft, so that the rotating shaft rotating at high speed can damage the electromagnetic bearing and even other equipment arranged on the rotating shaft, and impact is caused on the whole rotor system. Disclosure of Invention In order to solve the technical problem, the present disclosure provides an electromagnetic bearing rotor system with high safety and an air compressor. A first aspect of the present disclosure provides an electromagnetic bearing rotor system comprising: A rotating shaft; the radial magnetic bearing is sleeved on the rotating shaft and used for supporting the radial load of the rotating shaft; The axial magnetic bearing is sleeved on the rotating shaft and used for supporting the axial load of the rotating shaft; The auxiliary bearing is an angular contact sliding bearing, the auxiliary bearing is sleeved on the rotating shaft and comprises a bearing outer ring and a bearing inner ring, the bearing inner ring is arranged in the bearing outer ring, the bearing inner ring is matched with the conical surface of the bearing outer ring, a ceramic metal composite coating is arranged on the inner surface of the bearing outer ring and/or the outer surface of the bearing inner ring, and the auxiliary bearing is used for providing radial and axial support for the rotating shaft when the radial magnetic bearing and/or the axial magnetic bearing fails. Optionally, the bearing inner ring is fixedly connected with the rotating shaft, and the bearing outer ring is fixedly connected with the static outer sleeve, wherein the static outer sleeve comprises a static component fixedly connected with the casing. Optionally, the ceramic-metal composite coating is a Cr3C2-25% NiCr ceramic-metal composite coating. Alternatively, the ceramic metal composite coating has a thickness of 100 μm to 300 μm. Optionally, the number of the auxiliary bearings is two, and the two auxiliary bearings are respectively arranged at two ends of the rotating shaft. Optionally, the radial magnetic bearing comprises a radial stator and a radial rotor, the radial rotor is sleeved on the rotating shaft, the radial stator is provided with a plurality of magnetic poles, and each magnetic pole is wound with a coil winding for regulating and controlling the radial rotor to be in balance through electromagnetic force. Optionally, the axial magnetic bearing comprises an axial stator and an axial rotor, the axial rotor is sleeved on the rotating shaft, the axial stator comprises two annular electromagnets with annular grooves, annular coil windings for regulating and controlling the axial rotor to be balanced through electromagnetic force are arranged in the annular grooves, and the two annular electromagnets are coaxially arranged on two sides of the axial rotor. Optionally, the electromagnetic bearing rotor system further comprises a position sensor and a controller; The position sensor is coaxially arranged with the rotating shaft, a gap is reserved between the position sensor and the rotating shaft, the position sensor is used for determining the axial position and the radial position of the rotating shaft, and the position sensor is connected with the radial magnetic bearing and the axial magnetic bearing; The controller is electrically connected with the position sensor and is used for receiving feedback of the position sensor, and the controller is electrically connected with the radial magnetic bearing and the axial magnetic bearing so as to control the force application of the radial magnetic bearing and/or the axial magnetic bearing. Optionally, the electromagnetic bearing rotor system further comprises a motor, the motor comprises a motor stator and a motor rotor, the motor stator can be fixed on the casing, the motor rotor is rotationally arranged in the motor stator and concentrically arranged with the motor stator, a sha