Motor assembling device and method

Abstract

The invention relates to the technical field of motor assembling, in particular to a motor assembling device and method. The motor assembling device comprises a guide shaft, a power pack and a clamping mechanism for clamping a stator. And the guide shaft is matched with the clamping mechanism, so that the guide shaft can penetrate into the stator clamped by the clamping mechanism. The power pack comprises a plurality of direct-current power supplies. During use, a plurality of power supplies are respectively connected with each winding of the stator, so that each winding of the stator generates a magnetic field, and the magnetic field generated by each winding is the same as the magnetic field of the closest rotor magnetic pole. When the rotor enters the stator, repulsive force of the stator is applied to the periphery of the rotor. And the rotor is locked at the center of the stator. The rotor is prevented from colliding with the inner wall of the stator in the process of entering the stator.

Description

Technical Field

[0001] The present invention relates to the technical field of motor assembly, and in particular to a motor assembly device and method. Background Art

[0002] In the production process of permanent magnet motors, the assembly of the stator and the rotor is a key step. Since the rotor has been magnetized before assembly and has a strong magnetic field, it is easily affected by magnetic force when inserted into the stator, causing the rotor to collide with the inner wall of the stator, thereby affecting the assembly accuracy and motor performance. Traditional assembly methods usually rely on manual operation or simple mechanical devices, which are difficult to effectively avoid magnetic interference and lack the ability to monitor and adjust the rotor position offset in real time. Therefore, there is an urgent need for a motor assembly device and method that can achieve high-precision assembly to solve the above problems. Summary of the invention

[0003] An object of the present invention is to provide a motor assembly device and method, which can prevent a rotor from colliding with a stator during the process of assembling the rotor into the stator.

[0004] The embodiments of the present invention are implemented by the following technical solutions: A motor assembly device comprises a guide shaft, a power supply group and a clamping mechanism for clamping a stator; the guide shaft is arranged in cooperation with the clamping mechanism so that the guide shaft can penetrate into the interior of the stator clamped by the clamping mechanism; the power supply group comprises a plurality of DC power supplies.

[0005] Furthermore, the guide shaft is provided with a plurality of spacing sensors distributed along its circumference; the clamping mechanism comprises an upper slide plate, a lower slide plate and a plurality of clamping claws; the lower slide plate is slidably arranged on a frame; the upper slide plate is slidably arranged on the upper surface of the lower slide plate and the sliding directions of the upper slide plate and the lower slide plate are perpendicular to each other; a plurality of the clamping claws are distributed in a ring shape on the upper surface of the upper slide plate; a plurality of the clamping claws are slidably arranged on the upper slide plate so that the plurality of the clamping claws can gather together or spread apart; a through hole for the guide shaft to pass through is arranged at the center of the upper slide plate and the lower slide plate.

[0006] Furthermore, it also includes a stabilizing arm; the stabilizing arm is escalably arranged on the frame; the stabilizing arm and the guide shaft are both provided with a clamping part for clamping the rotating shaft of the rotor, and the two clamping parts are arranged opposite to each other.

[0007] Furthermore, the stabilizing arm is provided with a connecting shaft, a magnetic suspension bearing and a plurality of distance sensors; the connecting shaft is provided on the stabilizing arm and can move in a horizontal plane relative to the stabilizing arm; a plurality of distance sensors are arranged around the connecting shaft; the magnetic suspension bearing includes a fixed part and a movable part sleeved inside the fixed part; the fixed part is provided on the stabilizing arm; the movable part is sleeved outside the connecting shaft.

[0008] Furthermore, the upper slide plate and the lower slide plate are both connected with a screw rod and a driving motor, so that the two driving motors can drive the upper slide plate or the lower slide plate to move through the screw rod.

[0009] Furthermore, the guide shaft is provided with a plurality of groups of spacing sensors; each group of spacing sensors is distributed along the axial direction of the guide shaft.

[0010] Furthermore, the clamping part includes a connecting head, a locking ring and a plurality of clips; the plurality of clips are distributed in a ring shape at one end of the connecting head; the locking ring is sleeved on the outside of the plurality of clips and is threadedly connected to the connecting head; the contact parts of the clips and the locking ring are cooperatively arranged in an inclined shape so that the plurality of clips can gather or open when the locking ring rotates.

[0011] A motor assembly method comprises the following steps: S1: Fix the stator to the clamping mechanism and insert the guide shaft into the stator; S2: Adjust the positions of the upper slide and the lower slide so that the distances between the inner wall of the stator and each distance sensor are the same; S3: Connect the rotor between the guide shaft and the connecting shaft; confirm the magnetic poles of the rotor and energize the stator windings so that when the rotor enters the stator, the magnetic poles of several stator windings are the same as the closest rotor magnetic poles; S4: Start the guide shaft so that the rotor gradually enters the stator.

[0012] Furthermore, after the rotor is clamped between the guide shaft and the connecting shaft, the magnetic bearing is energized to move the connecting shaft to face the guide shaft.

[0013] Furthermore, when the rotor enters the stator, the spacing sensor and the distance sensor respectively monitor the offset of the connecting shaft and the guide shaft, and the controller controls the current of the stator winding and the magnetic bearing according to the offset so that the rotor is always located at the center of the stator.

[0014] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: When the motor assembly device of the present invention is used, the motor stator is placed on a clamping mechanism and fixed by the clamping mechanism, and then the guide shaft is passed through the inside of the stator. The rotating shaft of the rotor is fixed to one end of the guide shaft and the rotor is gradually introduced into the inside of the stator through the guide shaft. In the process of the rotor entering the inside of the stator, several power supplies are connected to each winding of the stator respectively, so that each winding of the stator generates a magnetic field. When the power is turned on, it is ensured that the magnetic field generated by each winding is the same as the magnetic field of the closest rotor pole. In the process of the rotor entering the stator, the rotor is subjected to the repulsive force of the stator on all sides. The rotor is then locked at the center of the stator. Avoid collision between the rotor and the inner wall of the stator during the process of entering the stator. Since the repulsive force on all sides of the rotor is of similar magnitude, the magnitude of the force on the rotor in any radial direction is small, which also makes it possible for the guide shaft to guide the rotor without providing a large radial force. The strength of the guide shaft is thereby reduced, making the entire device simpler.

[0015] When the guide shaft is inserted into the stator, several distance sensors detect the distance between it and the inner wall of the stator. If a sensor is too close to the inner wall of the stator, the upper and lower slides can be adjusted to move so that the inner wall of the stator is at the same distance from the guide shaft. In this way, the guide shaft can be located at the center of the stator. When the rotor is placed on the guide shaft, the concentricity of the rotor and the stator is guaranteed. This can better prevent the rotor from colliding with the inner wall of the stator when entering the stator.

[0016] In practice, the guide shaft drives the rotor downward into the stator. The rotor is fixed to the upper end of the guide shaft and supported by the guide shaft. A stabilizing arm is provided above the guide shaft to support the upper part of the rotor, thereby ensuring that the rotor is always in a vertical state during the process of entering the stator. The position of the rotor is also limited to prevent the upper end from shaking and colliding with the stator.

[0017] When the rotor enters the stator, the distance sensor monitors the shaking of the connector and controls the current of the magnetic bearing according to the shaking. The magnetic field generated by the magnetic bearing drives the connecting shaft to move in the horizontal plane. This ensures that the rotor is always in a vertical state. The upper and lower slides are both equipped with screws and drive motors, which enables the upper and lower slides to automatically adjust according to the data detected by the distance sensor, so that the guide shaft is located in the center of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the motor assembly device of the present invention.

[0019] Figure 2 Schematic diagram of the rotor before entering the stator.

[0020] Figure 3This is a schematic diagram of the rotor entering the stator.

[0021] Figure 4 Schematic diagram of the magnetic field distribution of the stator and rotor.

[0022] Figure 5 for Figure 2 Enlarged view of point a in the middle.

[0023] Figure 6 for Figure 2 Enlarged view of point b in the middle.

[0024] Figure numerals: 1-guide shaft, 2-statator, 3-rotor, 4-distance sensor, 5-upper slide, 6-lower slide, 7-clamp, 8-stabilizing arm, 9-frame, 10-connecting shaft, 11-distance sensor, 12-fixed part, 13-moving part, 14-screw, 15-drive motor, 16-connector, 17-locking ring, 18-clamp, 19-belt, 20-transmission wheel, 21-winding. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 6 As shown, the present invention provides a motor assembly device, including a guide shaft 1, a power supply group and a clamping mechanism for clamping the stator 2. The clamping mechanism is used to clamp the stator 2, thereby preventing the stator 2 from shaking during the assembly process. The guide shaft 1 is arranged in cooperation with the clamping mechanism so that the guide shaft 1 can penetrate into the interior of the stator 2 clamped by the clamping mechanism. The power supply group includes a plurality of DC power supplies. Each of the plurality of DC power supplies is connected to a winding 21 of the stator 2 so that the stator 2 generates a magnetic field. When the power supply is connected to the winding 21, it is ensured that the direction of the magnetic field generated by each winding 21 of the stator 2 after the power is turned on is the same as the direction of the magnetic field of the closest pole when the rotor 3 enters. Thereby, the magnetic forces of the stator 2 and the rotor 3 repel each other. The specific direction of the magnetic field can be referred to. Figure 4 At the same time, the magnitude of the magnetic field and magnetic force generated by each winding 21 can be controlled by controlling the current of each winding 21 individually. The position of the rotor 3 inside the stator 2 can be controlled by the magnitude of the magnetic force in each direction. In practice, it is only necessary to ensure that the rotor 3 is at the center of the stator 2 by the magnetic force generated by each winding 21 of the stator 2.

[0026] The frame 9 is provided with a transmission wheel 20, which is connected to the frame 9 through a slider stuck in the inside of the slide slot, so that the transmission wheel 20 is restricted to the frame 9 and can rotate relative to the frame 9. The guide shaft 1 is passed through the transmission wheel 20 and is threadedly connected to the inside of the transmission wheel 20, so that when the transmission wheel 20 rotates, the guide shaft 1 rises and falls under the action of the thread. The transmission wheel 20 is connected to the motor through a belt 19, so that the guide shaft 1 is driven to rise and fall by the motor, thereby controlling the process of the rotor 3 entering the stator 2.

[0027] When the motor assembly device of the present invention is used, the motor stator 2 is placed in a clamping mechanism and fixed by the clamping mechanism, and then the guide shaft 1 is passed through the inside of the stator 2. The rotating shaft of the rotor 3 is fixed to one end of the guide shaft 1 and the rotor 3 is gradually introduced into the inside of the stator 2 through the guide shaft 1. In the process of the rotor 3 entering the inside of the stator 2, several power supplies are connected to each winding 21 of the stator 2 respectively, so that each winding 21 of the stator 2 generates a magnetic field. When the power is turned on, it is ensured that the magnetic field generated by each winding 21 is the same as the magnetic field of the closest magnetic pole of the rotor 3. Then, the rotor 3 is subjected to the repulsive force of the stator 2 all around when it enters the stator 2. Then, the rotor 3 is locked at the center of the stator 2. Avoid collision between the rotor 3 and the inner wall of the stator 2 when it enters the stator 2. Since the repulsive force on the rotor 3 is of equal magnitude, the magnitude of the force on the rotor 3 in any radial direction is small, which also makes it possible for the guide shaft 1 to guide the rotor 3 without providing a large radial force. Then, the strength of the guide shaft 1 is reduced, making the entire device simpler.

[0028] It should also be noted that Figure 4 In the figure, the letter "S" represents the S pole, "N" represents the N pole, "A+" represents the current input terminal of phase A of the three-phase power supply, "A-" represents the current output terminal of phase A of the three-phase power supply, "B+" represents the current input terminal of phase B of the three-phase power supply, "B-" represents the current output terminal of phase B of the three-phase power supply, "C+" represents the current input terminal of phase C of the three-phase power supply, and "C-" represents the current output terminal of phase C of the three-phase power supply. Since the current direction of the AC power supply changes, the current input and output terminals of each phase will be constantly interchanged. Figure 4 Only the direction of each phase current at a certain moment is shown.

[0029] In this embodiment, a plurality of spacing sensors 4 are distributed along the circumference of the guide shaft 1. Figure 2 , Figure 3 and Figure 6 As shown, the clamping mechanism includes an upper slide 5, a lower slide 6 and a plurality of clamping jaws 7. The lower slide 6 is slidably disposed on a frame 9. The upper slide 5 is slidably disposed on the upper surface of the lower slide 6 and the sliding directions of the upper slide 5 and the lower slide 6 are perpendicular to each other. The plurality of clamping jaws 7 are distributed in a ring shape on the upper surface of the upper slide 5. The plurality of clamping jaws 7 are slidably disposed on the upper slide 5 so that the plurality of clamping jaws 7 can gather or spread out from each other. A through hole for the guide shaft 1 to pass through is disposed at the center of the upper slide 5 and the lower slide 6.

[0030] Specifically, the upper surface of the frame 9 is provided with a track in cooperation with the lower surface of the lower slide 6, and the lower slide 6 is provided with a slide groove in cooperation with the track, so that the lower slide 6 can slide in a horizontal plane relative to the frame 9. Similarly, the lower slide 6 and the upper slide 5 are also provided with slide grooves and tracks, so that the upper slide 5 and the lower slide 6 can also slide relative to each other in a horizontal plane. The upper surface of the upper slide 5 is provided with a plurality of slide grooves in a radial manner. A plurality of clamping jaws 7 are slidably arranged inside the slide grooves, so that the clamping jaws 7 can gather together or spread apart. In order to facilitate the control of the movement of the clamping jaws 7, an adjusting screw is also provided above the clamping jaws 7. By rotating the adjusting screw, the clamping jaws 7 can be moved away from or close to each other. When the stator 2 is placed between the plurality of clamping jaws 7, the plurality of clamping jaws 7 can gather together to clamp and fix the nail. Similarly, the stator 2 can be removed after the plurality of clamping jaws 7 are spread apart.

[0031] When the guide shaft 1 is inserted into the stator 2, a plurality of spacing sensors 4 detect the spacing between the guide shaft 1 and the inner wall of the stator 2. If a sensor is close to the inner wall of the stator 2, the upper slide plate 5 and the lower slide plate 6 can be adjusted to move so that the inner wall of the stator 2 is at the same distance from the guide shaft 1. In this way, the guide shaft 1 can be located at the center of the stator 2. When the rotor 3 is placed on the guide shaft 1, the concentricity of the rotor 3 and the stator 2 is guaranteed. This can better prevent the rotor 3 from colliding with the inner wall of the stator 2 when entering the stator 2.

[0032] In this embodiment, a stabilizing arm 8 is also included. Figure 2 and Figure 3 As shown, the stabilizing arm 8 is arranged on the frame 9 so as to be liftable. The stabilizing arm 8 and the guide shaft 1 are both provided with a clamping part for clamping the rotating shaft of the rotor 3, and the two clamping parts are arranged opposite to each other. The stabilizing arm 8 is sleeved on the outside of the frame 9, so as to be liftable. The stabilizing arm 8 is also provided with a screw rod 14 and a motor, so as to drive it to lift.

[0033] In practice, the guide shaft 1 drives the rotor 3 downward into the stator 2. The rotor 3 is fixed to the upper end of the guide shaft 1 and supported by the guide shaft 1. A stabilizing arm 8 is provided above the guide shaft 1 to support the upper part of the rotor 3, thereby ensuring that the rotor 3 is always in a vertical state during the process of entering the stator 2. The position of the rotor 3 is also limited to prevent the upper end from shaking and colliding with the stator 2.

[0034] In this embodiment, the stabilizing arm 8 is provided with a connecting shaft 10, a magnetic bearing and a plurality of distance sensors 11. Figure 5As shown, the connecting shaft 10 is arranged on the stabilizing arm 8 and can move in a horizontal plane relative to the stabilizing arm 8. A plurality of distance sensors 11 are arranged around the connecting shaft 10. The magnetic suspension bearing includes a fixed part 12 and a movable part 13 sleeved inside the fixed part 12. The fixed part 12 is arranged on the stabilizing arm 8. The movable part 13 is sleeved on the outside of the connecting shaft 10. The movable part 13 is provided with a permanent magnet, generally 4 of which are provided. The 4 permanent magnets are distributed in a cross shape. The fixed part 12 is provided with a winding 21 corresponding to each permanent magnet. The magnitude of the magnetic force generated by the winding 21 can be controlled by controlling the current magnitude of the winding 21, and then the movement of the movable part 13 is controlled by the mutually repelling magnetic force, so that the connecting shaft 10 can be controlled to move in the horizontal plane.

[0035] When the rotor 3 enters the stator 2, the distance sensor 11 monitors the shaking of the connector 16, and then controls the current of the magnetic bearing according to the shaking. Then, the magnetic field generated by the magnetic bearing drives the connecting shaft 10 to move in the horizontal plane, thereby ensuring that the rotor 3 is always in a vertical state.

[0036] In this embodiment, the upper slide plate 5 and the lower slide plate 6 are both connected with a screw rod 14 and a drive motor 15, so that the two drive motors 15 drive the upper slide plate 5 or the lower slide plate 6 to move through the screw rod 14. The upper slide plate 5 and the lower slide plate 6 are both provided with a screw rod 14 and a drive motor 15, so that the upper slide plate 5 and the lower slide plate 6 can be automatically adjusted according to the data detected by the spacing sensor 4, so that the guide shaft 1 is located at the center of the stator 2.

[0037] In this embodiment, the guide shaft 1 is provided with a plurality of groups of spacing sensors 4. Each group of spacing sensors 4 is distributed along the axial direction of the guide shaft 1. Figure 6 As shown, the guide shaft 1 is provided with two groups of spacing sensors 4. When the guide shaft 1 is inserted into the stator 2, the two groups of spacing sensors 4 simultaneously detect the distance between the guide shaft 1 and the inner wall of the stator 2 and adjust the upper slide plate 5 and the lower slide plate 6 so that the upper and lower ends of the guide shaft 1 are at the same distance from the inner wall of the stator 2, that is, the entire guide shaft 1 is concentric with the stator 2. This better ensures the concentricity of the guide shaft 1 and the stator 2, and further ensures the concentricity of the rotor 3 when it enters the stator 2. At the same time, the spacing sensors 4 are provided on the upper and lower parts so that when the rotor 3 gradually enters the stator 2, there is always a spacing sensor 4 on the guide shaft 1 located inside the stator 2 and performs position detection, thereby better ensuring that the rotor 3 is in a vertical state during the process of entering the stator 2.

[0038] In this embodiment, the clamping portion includes a connector 16, a locking ring 17 and a plurality of clips 18. Figure 5As shown, a plurality of clips 18 are distributed in a ring shape at one end of the connector 16. The locking ring 17 is sleeved on the outside of the plurality of clips 18 and is threadedly connected to the connector 16. The contact parts of the clips 18 and the locking ring 17 are both arranged in a bevel shape so that the plurality of clips 18 gather or open when the locking ring 17 rotates. The clips 18 are made of spring steel. When the locking ring 17 is gradually tightened, the locking ring 17 gradually squeezes the nail plate, thereby making the plurality of clips 18 move closer to the middle, thereby clamping the rotating shaft of the rotor 3. When the locking ring 17 is gradually loosened, the plurality of clips 18 gradually open under the action of elastic force, thereby facilitating the removal of the rotating shaft of the rotor 3 therefrom. This structure facilitates the fixation of the rotating shaft of the rotor 3 with the guide shaft 1 and the connecting shaft 10. It also ensures the concentricity of the rotating shaft when connected with the guide shaft 1 and the connecting shaft 10.

[0039] The present invention also provides a motor assembly method, comprising the following steps: S1: Fix the stator 2 on the clamping mechanism and pass the guide shaft 1 through the inside of the stator 2.

[0040] S2: Adjust the positions of the upper slide plate 5 and the lower slide plate 6 so that the distances between the inner wall of the stator 2 and each distance sensor 11 are the same.

[0041] S3: Connect the rotor 3 between the guide shaft 1 and the connecting shaft 10. Confirm the magnetic poles of the rotor 3 and energize the stator 2 windings 21 so that when the rotor 3 enters the stator 2, the magnetic poles of some stator 2 windings 21 are the same as the closest rotor 3 magnetic poles.

[0042] S4: Start the guide shaft 1 so that the rotor 3 gradually enters the interior of the stator 2.

[0043] The magnetic field generated by the winding 21 of the stator 2 pushes the rotor 3 toward the center, so that the rotor 3 is located at the center of the stator 2. At the same time, the rotor 3 is prevented from colliding with the inner wall of the stator 2, thereby better ensuring the quality of assembly.

[0044] In this embodiment, after the rotor 3 is clamped between the guide shaft 1 and the connecting shaft 10, the magnetic bearing is energized to move the connecting shaft 10 to face the guide shaft 1, thereby ensuring the concentricity of the rotor 3 and the stator 2.

[0045] In this embodiment, when the rotor 3 enters the stator 2, the spacing sensor 4 and the distance sensor 11 respectively monitor the offset of the connecting shaft 10 and the guide shaft 1, and the controller controls the current of the stator 2 winding 21 and the magnetic bearing according to the offset so that the rotor 3 is always located at the center of the stator 2.

Claims

1. A motor assembly device, characterized in that: It comprises a guide shaft, a power supply group and a clamping mechanism for clamping a stator; the guide shaft is arranged in cooperation with the clamping mechanism so that the guide shaft can penetrate into the interior of the stator clamped by the clamping mechanism; the power supply group comprises a plurality of DC power supplies.

2. The motor assembly device according to claim 1, characterized in that: The guide shaft is provided with a plurality of spacing sensors distributed along its circumference; the clamping mechanism comprises an upper slide plate, a lower slide plate and a plurality of clamping claws; the lower slide plate is slidably arranged on a frame; the upper slide plate is slidably arranged on the upper surface of the lower slide plate and the sliding directions of the upper slide plate and the lower slide plate are perpendicular to each other; a plurality of the clamping claws are distributed in a ring shape on the upper surface of the upper slide plate; a plurality of the clamping claws are slidably arranged on the upper slide plate so that the plurality of the clamping claws can gather together or spread apart; a through hole for the guide shaft to pass through is arranged at the center of the upper slide plate and the lower slide plate.

3. The motor assembly device according to claim 2, characterized in that: It also includes a stabilizing arm; the stabilizing arm is escalably arranged on the frame; the stabilizing arm and the guide shaft are both provided with a clamping part for clamping the rotating shaft of the rotor, and the two clamping parts are arranged opposite to each other.

4. The motor assembly device according to claim 3, characterized in that: The stabilizing arm is provided with a connecting shaft, a magnetic suspension bearing and a plurality of distance sensors; the connecting shaft is arranged on the stabilizing arm and can move in a horizontal plane relative to the stabilizing arm; a plurality of distance sensors are arranged around the connecting shaft; the magnetic suspension bearing includes a fixed part and a movable part sleeved inside the fixed part; the fixed part is arranged on the stabilizing arm; the movable part is sleeved outside the connecting shaft.

5. The motor assembly device according to claim 4, characterized in that: The upper slide plate and the lower slide plate are both connected with a screw rod and a driving motor, so that the two driving motors can drive the upper slide plate or the lower slide plate to move through the screw rod.

6. The motor assembly device according to claim 5, characterized in that: The guide shaft is provided with a plurality of groups of spacing sensors; each group of spacing sensors is distributed along the axial direction of the guide shaft.

7. The motor assembly device according to claim 6, characterized in that: The clamping part includes a connecting head, a locking ring and a plurality of clips; the plurality of clips are distributed in a ring shape at one end of the connecting head; the locking ring is sleeved on the outside of the plurality of clips and is threadedly connected to the connecting head; the contact parts of the clips and the locking ring are both arranged in a slope shape so that the plurality of clips can be gathered or opened when the locking ring rotates.

8. A motor assembly method, characterized in that: The steps include: S1: Fix the stator to the clamping mechanism and insert the guide shaft into the stator; S2: Adjust the positions of the upper slide and the lower slide so that the distances between the inner wall of the stator and each distance sensor are the same; S3: Connect the rotor between the guide shaft and the connecting shaft; confirm the magnetic poles of the rotor and energize the stator windings so that when the rotor enters the stator, the magnetic poles of several stator windings are the same as the closest rotor magnetic poles; S4: Start the guide shaft so that the rotor gradually enters the stator.

9. The motor assembly method according to claim 8, characterized in that: After the rotor is clamped between the guide shaft and the connecting shaft, the magnetic bearing is energized to move the connecting shaft to face the guide shaft.

10. The motor assembly method according to claim 9, characterized in that: When the rotor enters the stator, the spacing sensor and distance sensor monitor the offset of the connecting shaft and the guide shaft respectively. The controller controls the current of the stator winding and the magnetic bearing according to the offset so that the rotor is always located at the center of the stator.

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