A magnetic suspension radial bearing rotor structure, radial bearing, and motor

Abstract

A magnetic suspension radial bearing rotor structure, a radial bearing, and a motor, which relate to the field of bearing technology, include a bearing rotor sleeved on both ends of a rotating shaft, the bearing rotor includes a collar sleeved on the rotating shaft, a soft magnetic component is sleeved on the collar, and a first bite component and a second bite component are respectively provided at both ends of the collar, the first bite component is sleeved with a first baffle, and the second bite component is sleeved with a second baffle, and the collar, the first baffle, and the second baffle are made of the same material. The present invention provides a first bite component and a second bite component at both ends of the collar, and uses a first baffle and a second baffle to replace spot welding fixation, thereby avoiding nonlinear deformation of the baffle and the collar and product quality problems during fine turning. At the same time, the collar, the first baffle and the second baffle are made of the same material. When the temperature of the parts rises due to the changing magnetic field, the baffle and the collar expand by the same amount, thereby avoiding separation of the baffle and the collar.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a magnetic suspension radial bearing rotor structure, a radial bearing, and a motor. Background Art

[0002] Magnetic bearings are high-performance mechatronic bearings that utilize electromagnetic force to stably suspend supported parts in space, eliminating mechanical contact between the supporting parts and the supported parts.

[0003] Magnetic bearings are divided into radial bearings and axial bearings. The radial bearing structure is mainly composed of a radial bearing stator and a radial bearing rotor.

[0004] In order to ensure that the main shaft rotor is evenly stressed during rotation, the magnetic levitation radial bearing adopts a ring-shaped structure, and is made of laminated silicon steel sheets to reduce rotor eddy current loss, and a baffle is used to fix the punching sheet to prevent the punching sheet from cracking during high-speed operation. The existing magnetic levitation radial bearing rotor structure consists of a radial bearing baffle, silicon steel sheets, and a center sleeve. The magnetic levitation bearing rotor needs to be hot-fitted into the rotor shaft.

[0005] The existing radial bearing rotor manufacturing process is as follows: heating the center ring, hot-fitting it to the front baffle, the center ring and the baffle are interference fit, heating the silicon steel sheet, hot-fitting it to the center ring, the silicon steel sheet and the center ring are interference fit, and then the center ring and the baffle are spot welded to form a complete radial bearing rotor; heating the radial bearing rotor, hot-fitting it to the shaft, the bearing rotor and the shaft are interference fit, and the front and rear radial bearing rotors and the shaft form a whole.

[0006] The following problems may occur when the baffles, collars and bearing rotors made of different materials and spot welded are assembled into the shaft:

[0007] On the one hand, in order to control the position adjustment of the rotating shaft in the radial direction, the current size is constantly changed, the electromagnetic force of the bearing is constantly changing, and a changing magnetic field is formed, which affects the winding, core copper loss, iron loss, eddy current, etc., thereby generating heat, causing the bearing rotor temperature to rise. Due to the different thermal expansion coefficients of the baffle and the center ring, the baffle is made of SUS304 material, and its linear expansion coefficient is about 17*10-6mm / ℃, and the center ring is made of 40CrNiMoA material, and its linear expansion coefficient is about 11.5*10-6mm / ℃. Under the same temperature rise, the expansion of the baffle is much larger than that of the center ring. Even if the baffle and the center ring have been spot welded, it cannot be guaranteed whether there are loose welding points at the welding point. The magnetic levitation motor runs at a high speed of 10,000rpm. Once the welding is not firm, the baffle and the center ring may separate, and the silicon steel sheet cannot be fixed, and the baffle may even fly out, causing serious quality problems.

[0008] On the other hand, the baffle and the center ring are spot welded, and the spot welding temperature is high, so the baffle, punching sheet and center ring will be deformed. According to the SUS304 and 40CrNiMoA materials, when there is zero interference fit between the two, the temperature is only 142°C, which is significantly lower than the spot welding temperature. At this time, the static pressure of the punching sheet on the baffle may cause the outer circle of the baffle to deform. In addition, the welding is only on one side of the baffle, which will cause welding stress deformation of the baffle. This is nonlinear deformation, resulting in poor fit between the center ring and the rotating shaft, and between the outer circle of the baffle and the radial bearing. Poor fit will affect the position sensor's control of the spindle's deviation from the center.

[0009] In addition, the spot welding between the baffle and the center collar is not smooth. Although the precision turning method can be used to turn the end face welding points and the joints of the baffle plate flat and polished, the precision turning amount cannot be controlled. When the precision turning amount is insufficient, the welding points are not turned flat. When the bearing rotor is hot-installed into the shaft, the raised part contacts the shaft shoulder, and a gap is generated between the flat end faces of the baffle and the center collar and the shaft, affecting the product quality. When the precision turning amount is too large, the welding points are turned more, which may cause loose welding, and the baffle and the center collar may separate during high-speed operation, affecting the product quality. Summary of the invention

[0010] One of the purposes of the present invention is to avoid the deficiencies in the prior art and provide a magnetically levitated radial bearing rotor structure, which can prevent the baffle and the ring from separating when the electromagnetic force of the bearing is constantly changing. At the same time, since the baffle and the ring are not fixed by electric welding, nonlinear deformation of the baffle and the ring and product quality problems caused by fine turning are avoided.

[0011] The purpose of the present invention is achieved through the following technical solutions:

[0012] A magnetic suspension radial bearing rotor structure is provided, comprising two identical bearing rotors respectively sleeved on both ends of a rotating shaft, the bearing rotor comprising a sleeve ring sleeved on the rotating shaft, the sleeve ring sleeved with a soft magnetic component, the sleeve ring is respectively provided with a first bite component and a second bite component at both ends, the first bite component is sleeved with a first baffle, the second bite component is sleeved with a second baffle, and the sleeve ring, the first baffle and the second baffle are made of the same material. By respectively providing the first bite component and the second bite component at both ends of the sleeve ring, and using the first baffle and the second baffle to respectively sleeve on the first bite component and the second bite component to replace the spot welding fixation of the baffle and the sleeve ring, nonlinear deformation of the baffle and the sleeve ring and product quality problems caused by fine turning are avoided, and at the same time, the sleeve ring, the first baffle and the second baffle are made of the same material, so that when the electromagnetic force of the bearing is constantly changing and the temperature of the parts is increased due to the changing magnetic field, the expansion amount of the baffle and the sleeve ring is the same, and the separation of the baffle and the sleeve ring is avoided.

[0013] Furthermore, the first engaging component is a first engaging step provided on the outer side wall of one end of the collar, and the first baffle is provided with a first step that matches the first engaging step. The first baffle is fixed on the first engaging step provided on the outer side wall of one end of the collar by matching the first step provided on the first baffle, thereby replacing the spot welding fixing method, avoiding nonlinear deformation of the baffle and the collar and product quality problems caused during fine turning.

[0014] Further, the highest point of the first bite step is flush with the outer side wall of the collar, and the lowest point of the first bite step is located on the outside of the collar. The highest point of the first bite step is flush with the outer side wall of the collar, and the lowest point of the first bite step is located on the outside of the collar, which facilitates the installation of the first baffle from this end.

[0015] Furthermore, the outer diameter of the first engaging step is larger than the inner diameter of the first step. The outer diameter of the first engaging step is larger than the inner diameter of the first step, and can be fixed by means of shrink fit interference fit, thereby replacing the spot welding fixation method, avoiding nonlinear deformation of the baffle and the collar and product quality problems caused by fine turning.

[0016] Furthermore, the second engaging component is a second engaging step provided on the outer side wall of the other end of the collar, and the second baffle is provided with a second step that matches the second engaging step. The second baffle is fixed on the second engaging step provided on the outer side wall of one end of the collar by matching the second step provided on the second baffle, thereby replacing the spot welding fixing method, avoiding nonlinear deformation of the baffle and the collar and product quality problems caused during fine turning.

[0017] Furthermore, the lowest point of the second engagement step is flush with the outer wall of the collar, and the highest point of the second engagement step is located on the outer side of the collar. The lowest point of the second engagement step is flush with the outer wall of the collar, and the highest point of the second engagement step is located on the outer side of the collar, so that the second baffle can only be inserted from the place where the first baffle is installed, so that the second baffle cannot fall off from the second engagement step under any circumstances, further preventing the baffle and the collar from separating.

[0018] Furthermore, the outer diameter of the second engagement step is larger than the inner diameter of the second step. The outer diameter of the second engagement step is larger than the inner diameter of the second step, and can be fixed by means of shrink fit interference fit, thereby replacing the spot welding fixation method, avoiding nonlinear deformation of the baffle and the collar and product quality problems caused during fine turning.

[0019] Furthermore, the soft magnetic component is a silicon steel sheet.

[0020] Beneficial effects of the present invention: A magnetic suspension radial bearing rotor structure of the present invention comprises two identical bearing rotors respectively sleeved on both ends of a rotating shaft, the bearing rotor comprises a sleeve ring sleeved on the rotating shaft, the sleeve ring is sleeved with a soft magnetic component, the two ends of the sleeve ring are respectively provided with a first bite component and a second bite component, the first bite component is sleeved with a first baffle, the second bite component is sleeved with a second baffle, and the sleeve ring, the first baffle and the second baffle are made of the same material. The present invention arranges the first bite component and the second bite component at both ends of the sleeve ring, and uses the first baffle and the second baffle to respectively sleeve on the first bite component and the second bite component to replace the spot welding fixation of the baffle and the sleeve ring, thereby avoiding the nonlinear deformation of the baffle and the sleeve ring and the product quality problems caused by fine turning. At the same time, the sleeve ring, the first baffle and the second baffle are made of the same material, so that when the electromagnetic force of the bearing is constantly changing and the temperature of the parts is increased due to the changing magnetic field, the expansion amount of the baffle and the sleeve ring is the same, thereby avoiding the separation of the baffle and the sleeve ring.

[0021] The second purpose of the present invention is to avoid the deficiencies in the prior art and provide a radial bearing, which uses the above-mentioned magnetic levitation radial bearing rotor structure. By respectively arranging a first bite component and a second bite component at both ends of the ring, and using a first baffle plate and a second baffle plate to respectively cooperate and sleeve on the first bite component and the second bite component to replace the spot welding fixation of the baffle plate and the ring, nonlinear deformation of the baffle plate and the ring and product quality problems caused during fine turning are avoided. At the same time, the ring, the first baffle plate and the second baffle plate are made of the same material, so that when the electromagnetic force of the bearing is constantly changing and the temperature of the parts is rising due to the changing magnetic field, the baffle plate and the ring can expand by the same amount, thereby avoiding separation of the baffle plate and the ring.

[0022] The third object of the present invention is to provide a motor to avoid the deficiencies in the prior art. The motor uses the above-mentioned radial bearing. By respectively arranging a first bite component and a second bite component at both ends of the ring, and using a first baffle plate and a second baffle plate to respectively cooperate and sleeve on the first bite component and the second bite component to replace the spot welding fixation of the baffle plate and the ring, nonlinear deformation of the baffle plate and the ring and product quality problems caused during fine turning are avoided. At the same time, the ring, the first baffle plate and the second baffle plate are made of the same material. When the electromagnetic force of the bearing is constantly changing and the temperature of the parts is rising due to the changing magnetic field, the baffle plate and the ring can expand by the same amount, thereby avoiding separation of the baffle plate and the ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0024] Figure 1It is a schematic diagram of the overall structure of a magnetic suspension radial bearing rotor structure installed on a rotating shaft according to the present invention.

[0025] Figure 2 It is a schematic diagram of the overall structure of a magnetic suspension radial bearing rotor structure of the present invention.

[0026] Figure 3 It is a cross-sectional view of a collar of a magnetic suspension radial bearing rotor structure of the present invention.

[0027] Figure 4 It is a top view of a collar of a magnetic suspension radial bearing rotor structure of the present invention.

[0028] Figure 5 It is a cross-sectional view of a first baffle of a magnetic suspension radial bearing rotor structure of the present invention.

[0029] Figure 6 It is a bottom view of a first baffle of a magnetic suspension radial bearing rotor structure of the present invention.

[0030] Figure 7 It is a cross-sectional view of a second baffle of a magnetic suspension radial bearing rotor structure of the present invention.

[0031] Figure 8 It is a bottom view of a second baffle of a magnetic suspension radial bearing rotor structure of the present invention.

[0032] Included in the picture are:

[0033] Rotating shaft 1, bearing rotor 2, collar 3, soft magnetic component 4, first baffle 5, second baffle 6. DETAILED DESCRIPTION

[0034] The present invention is further described in conjunction with the following examples.

[0035] Example 1

[0036] A magnetic suspension radial bearing rotor structure of this embodiment, such as Figure 1-8As shown, it includes two identical bearing rotors 2 respectively sleeved on both ends of the rotating shaft 1, the bearing rotor 2 includes a collar 3 sleeved on the rotating shaft 1, the collar 3 is sleeved with a soft magnetic component 4, the two ends of the collar 3 are respectively provided with a first bite component and a second bite component, the first bite component is sleeved with a first baffle 5, the second bite component is sleeved with a second baffle 6, and the collar 3, the first baffle 5 and the second baffle 6 are made of the same material. By respectively providing the first bite component and the second bite component at both ends of the collar 3, and using the first baffle 5 and the second baffle 6 to respectively sleeve on the first bite component and the second bite component to replace the spot welding fixation of the baffle and the collar 3, the nonlinear deformation of the baffle and the collar 3 and the product quality problems caused by fine turning are avoided. At the same time, the collar 3, the first baffle 5 and the second baffle 6 are made of the same material, so that when the electromagnetic force of the bearing is constantly changing and the temperature of the parts is increased due to the changing magnetic field, the expansion amount of the baffle and the collar is the same, and the separation of the baffle and the collar is avoided. The production efficiency and product quality of the product are improved.

[0037] The first engaging component is a first engaging step provided on the outer side wall of one end of the collar 3, and the first baffle 5 is provided with a first step matched with the first engaging step. The first baffle 5 is fixed on the first engaging step provided on the outer side wall of one end of the collar 3 by the first step provided by itself, thereby replacing the spot welding fixing method, avoiding nonlinear deformation of the baffle and the collar 3 and product quality problems caused during fine turning.

[0038] The highest point of the first bite step is flush with the outer side wall of the collar 3, and the lowest point of the first bite step is located on the outside of the collar 3. The highest point of the first bite step is flush with the outer side wall of the collar 3, and the lowest point of the first bite step is located on the outside of the collar 3, which facilitates the installation of the first baffle 5 from this end.

[0039] The outer diameter of the first engaging step is larger than the inner diameter of the first step. The outer diameter of the first engaging step is larger than the inner diameter of the first step, and can be fixed by means of shrink fit interference fit, thereby replacing the spot welding fixation method, avoiding nonlinear deformation of the baffle and the collar 3 and product quality problems caused by fine turning.

[0040] The second engaging member is a second engaging step provided on the outer side wall of the other end of the collar 3, and the second baffle 6 is provided with a second step matched with the second engaging step. The second baffle 6 is fixed on the second engaging step provided on the outer side wall of one end of the collar 3 by the second step provided on the second baffle 6 itself, thereby replacing the spot welding fixing method, avoiding nonlinear deformation of the baffle and the collar 3 and product quality problems caused during fine turning.

[0041] The lowest point of the second engagement step is flush with the outer wall of the collar 3, and the highest point of the second engagement step is located on the outer side of the collar 3. The lowest point of the second engagement step is flush with the outer wall of the collar 3, and the highest point of the second engagement step is located on the outer side of the collar 3, so that the second baffle 6 can only be inserted from the place where the first baffle 5 is installed, so that the second baffle 6 cannot fall off from the second engagement step under any circumstances, further preventing the baffle and the collar 3 from separating.

[0042] The outer diameter of the second engagement step is larger than the inner diameter of the second step. The outer diameter of the second engagement step is larger than the inner diameter of the second step, and can be fixed by means of shrink fit interference fit, thereby replacing the spot welding fixation method, avoiding nonlinear deformation of the baffle and the collar 3 and product quality problems caused during fine turning.

[0043] The soft magnetic component is a silicon steel sheet.

[0044] Example 2

[0045] This embodiment provides a radial bearing, which uses the magnetic suspension radial bearing rotor structure described in Example 1. By respectively setting a first bite component and a second bite component at both ends of the collar 3, and using a first baffle 5 and a second baffle 6 to respectively fit on the first bite component and the second bite component to replace the spot welding fixation of the baffle and the collar 3, nonlinear deformation of the baffle and the collar 3 and product quality problems caused by fine turning are avoided. At the same time, the collar 3, the first baffle 5 and the second baffle 6 are made of the same material, so that when the electromagnetic force of the bearing is constantly changing and the temperature of the parts is increased due to the changing magnetic field, the baffle and the collar expand by the same amount, thereby avoiding separation of the baffle and the collar. Product production efficiency and product quality are improved.

[0046] Example 3

[0047] This embodiment provides a motor, which uses the radial bearing described in Embodiment 2. By respectively setting a first bite component and a second bite component at both ends of the collar 3, and using a first baffle 5 and a second baffle 6 to respectively fit on the first bite component and the second bite component to replace the spot welding fixation of the baffle and the collar 3, nonlinear deformation of the baffle and the collar 3 and product quality problems caused during fine turning are avoided. At the same time, the collar 3, the first baffle 5 and the second baffle 6 are made of the same material, so that when the electromagnetic force of the bearing is constantly changing and the temperature of the parts is increased due to the changing magnetic field, the baffle and the collar expand by the same amount, thereby avoiding separation of the baffle and the collar. Product production efficiency and product quality are improved.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A magnetic suspension radial bearing rotor structure, comprising two identical bearing rotors respectively sleeved on both ends of a rotating shaft, characterized in that: The bearing rotor comprises a collar sleeved on the rotating shaft, a soft magnetic component is sleeved on the collar, a first bite component and a second bite component are respectively arranged at two ends of the collar, the first bite component is sleeved with a first baffle, the second bite component is sleeved with a second baffle, and the collar, the first baffle and the second baffle are made of the same material; The first engaging component is a first engaging step provided on the outer side wall of one end of the collar, and the first baffle is provided with a first step matching the first engaging step; The highest point of the first engagement step is flush with the outer side wall of the collar, and the lowest point of the first engagement step is located on the outer side of the collar; The outer diameter of the first engaging step is greater than the inner diameter of the first step; The second engaging component is a second engaging step provided on the outer side wall of the other end of the collar, and the second baffle is provided with a second step matching the second engaging step; The lowest point of the second engagement step is flush with the outer side wall of the collar, and the highest point of the second engagement step is located on the outer side of the collar.

2. A magnetic suspension radial bearing rotor structure according to claim 1, characterized in that: An outer diameter of the second engaging step is greater than an inner diameter of the second step.

3. A magnetic suspension radial bearing rotor structure according to claim 1, characterized in that: The soft magnetic component is a silicon steel sheet.

4. A radial bearing, characterized in that: The invention comprises the magnetic suspension radial bearing rotor structure as described in any one of claims 1 to 3.

5. A motor, characterized in that: Includes the radial bearing described in claim 4.

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