Variable pitch bearing based on magnetic support and working method

Abstract

The invention discloses a variable-pitch bearing based on magnetic support and a working method, solves the problem that a variable-pitch bearing in the prior art is poor in impact load buffering effect, and has the beneficial effects of being more stable and buffering impact loads. Comprising first electromagnets arranged on two raceway surfaces of an axial raceway of the variable-pitch bearing, second electromagnets arranged on two raceway surfaces of a radial raceway of the variable-pitch bearing, a first distance sensor arranged in the axial raceway of the variable-pitch bearing and a second distance sensor arranged in the radial raceway of the variable-pitch bearing, the first electromagnets, the first distance sensor, the second electromagnets and the second distance sensor are independently connected with the controller, and acting force opposite in direction is provided for the variable pitch bearing inner ring through repulsive force generated between the first electromagnets and between the second electromagnets.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power, and in particular to a pitch bearing based on magnetic support and a working method thereof. Background Art

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Pitch adjustment of the blade is an essential function in a wind turbine generator set. Currently, the rotating component for realizing blade pitch adjustment in a wind turbine generator set is called a pitch bearing. Currently, most pitch bearings are of a "three-row column" structure. That is: there are two rows of rollers axially, namely the pitch bearing axial rollers 5, and one row of rollers radially, namely the pitch bearing radial rollers 4, as shown in the screenshot Figure 1 as shown.

[0004] The outer ring of the pitch bearing is connected to the hub, and the inner ring is connected to the blade. By driving the pitch bearing inner ring 3 to engage the teeth on the pitch bearing inner ring 3, the relative movement between the pitch bearing inner ring 3 and the pitch bearing outer ring is realized, so as to realize the self-rotation of the blade relative to the hub, and thus realize pitch adjustment.

[0005] Currently, the three rows of rollers inside the pitch bearing are in line contact, which requires the raceway to have a high hardness and a good heat treatment process, and the rollers themselves also have high machining accuracy requirements.

[0006] The existing structure of the pitch bearing is a rigid connection structure. When subjected to loads, it is unable to adjust the distance between the two raceway surfaces in the raceway, and the buffering effect on impact loads is not obvious enough.

[0007] In addition, when the existing pitch structure is driven, it requires a relatively high rotational torque, and the pitch drive cost is relatively high. Summary of the Invention

[0008] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a pitch bearing based on magnetic support, which significantly reduces the overall impact load received.

[0009] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0010] A pitch bearing based on magnetic support, comprising a first electromagnet disposed on two raceway surfaces of the axial raceway of the pitch bearing and a second electromagnet disposed on two raceway surfaces of the radial raceway of the pitch bearing. It also includes a first distance sensor disposed in the axial raceway of the pitch bearing and a second distance sensor disposed in the radial raceway of the pitch bearing. The first electromagnet, the first distance sensor, the second electromagnet, and the second distance sensor are respectively and independently connected to a controller. Repulsive forces generated between the first electromagnets and between the second electromagnets provide acting forces with opposite directions for the inner ring of the pitch bearing. The first distance sensor and the second distance sensor send the detected data to the controller, and the controller adjusts the current magnitudes of the first electromagnet and the second electromagnet so that the distance of the axial raceway is within a first set range and the distance of the radial raceway is within a second set range.

[0011] For a pitch bearing based on magnetic support as described above, the first distance sensor can be replaced by a first piezoelectric sensor, and the second distance sensor can be replaced by a second piezoelectric sensor. The first piezoelectric sensor and the second piezoelectric sensor are respectively and independently connected to the controller.

[0012] For a pitch bearing based on magnetic support as described above, it further includes a first piezoelectric sensor and a second piezoelectric sensor. The first piezoelectric sensor is also disposed in the axial raceway of the pitch bearing, and the second piezoelectric sensor is disposed in the radial raceway of the pitch bearing. The first piezoelectric sensor and the second piezoelectric sensor are respectively and independently connected to the controller.

[0013] For a pitch bearing based on magnetic support as described above, the first piezoelectric sensor and the first distance sensor are disposed at intervals in the axial raceway of the pitch bearing, and the second piezoelectric sensor and the second distance sensor are disposed at intervals in the radial raceway of the pitch bearing.

[0014] For a pitch bearing based on magnetic support as described above, the first electromagnet includes two parts. One part is a first outer-ring electromagnet embedded in the outer ring of the pitch bearing, and the other part is a first inner-ring electromagnet embedded in the inner ring of the pitch bearing. The first outer-ring electromagnet and the first inner-ring electromagnet in the axial raceway of the pitch bearing are arranged oppositely.

[0015] For a pitch bearing based on magnetic support as described above, along the axial raceway of the pitch bearing, multiple first outer-ring electromagnets are provided, and the interval distance is set between adjacent two first outer-ring electromagnets. Multiple first inner-ring electromagnets are also provided, and the interval distance is set between adjacent two first inner-ring electromagnets. The first inner-ring electromagnets correspond to the first outer-ring electromagnets one by one, and the first distance sensor is disposed between adjacent two first outer-ring electromagnets or between adjacent two first inner-ring electromagnets.

[0016] A pitch bearing based on magnetic support as described above, wherein the second electromagnet comprises two parts, one part is the second outer-ring electromagnet embedded in the outer ring of the pitch bearing, and the other part is the second inner-ring electromagnet embedded in the inner ring of the pitch bearing. The second outer-ring electromagnet and the second inner-ring electromagnet in the axial raceway of the pitch bearing are arranged oppositely.

[0017] A pitch bearing based on magnetic support as described above. Along the radial raceway of the pitch bearing, multiple pieces are arranged in the second outer-ring electromagnet, and the distance between adjacent two second outer-ring electromagnets is set at intervals. The second inner-ring electromagnet comprises multiple pieces, and the distance between adjacent two second inner-ring electromagnets is set at intervals. The second inner-ring electromagnets correspond to the second outer-ring electromagnets one by one. The second distance sensors are arranged between adjacent two second outer-ring electromagnets or adjacent two second inner-ring electromagnets.

[0018] A pitch bearing based on magnetic support as described above. The axial raceway of the pitch bearing comprises an upper raceway and a lower raceway. The first electromagnet and the first distance sensors are arranged in the upper raceway and the lower raceway.

[0019] In a second aspect, the present invention further provides a working method for a pitch bearing based on magnetic support, including the following contents:

[0020] Arrange the first electromagnets on the two raceway surfaces of the axial raceway of the pitch bearing, arrange the second electromagnets on the two raceway surfaces of the radial raceway of the pitch bearing, arrange the first distance sensors in the axial raceway of the pitch bearing, and arrange the second distance sensors in the radial raceway of the pitch bearing;

[0021] The first distance sensors detect the distance between the two raceway surfaces of the axial raceway of the pitch bearing and send it to the controller. When the controller determines that the distance between the two raceway surfaces of the axial raceway of the pitch bearing becomes smaller, it controls the first electromagnet to increase the current. If the controller determines that the distance between the two raceway surfaces of the axial raceway of the pitch bearing increases, it controls the first electromagnet to decrease the current;

[0022] The second distance sensors detect the distance between the two raceway surfaces of the radial raceway of the pitch bearing and send it to the controller. When the controller determines that the distance between the two raceway surfaces of the radial raceway of the pitch bearing becomes smaller, it controls the second electromagnet to increase the current. If the controller determines that the distance between the two raceway surfaces of the radial raceway of the pitch bearing increases, it controls the second electromagnet to decrease the current.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1) In the present invention, electromagnets are arranged on the raceway surfaces of the axial raceway and the radial raceway, and distance sensors are arranged in the axial raceway and the radial raceway. The repulsive force between the electromagnets serves as the supporting force for the rollers, thereby changing the line contact between the rollers and the raceway into the surface contact between the electromagnets and the raceway. The form is more stable, the stress condition is better, the reliability of the overall structure is ensured, and the requirements for the raceway are reduced.

[0025] 2) Through the arrangement of the electromagnets in the present invention, the inner ring of the pitch bearing is in a floating structure, which plays a buffering role for the impact load received by the pitch bearing. Due to the arrangement of the distance sensors, the controller controls the current magnitude of the corresponding electromagnets according to the data detected by the distance sensors to ensure the distance between the raceway surfaces in the raceway, which has a good effect on unloading the impact load and significantly reduces the impact load received by the overall drive chain.

[0026] 3) By energizing the electromagnets in the present invention, it is ensured that the inner ring of the pitch bearing is in a floating state. By adjusting the magnitude of the current passing through the electromagnets, the inner ring of the pitch bearing is suspended from the outer ring of the pitch bearing, thereby changing the original friction mode of rolling friction by the method of separating the contact surfaces. Further, the rotational torque can be adjusted. Due to the reduction of the frictional force, less rotational torque is required, achieving cost reduction of the pitch drive.

[0027] 4) In the present invention, the distance sensor can be replaced by a piezoelectric sensor to realize the detection of the pressure magnitude between the raceways. According to the magnitude of the pressure, the current magnitude of the electromagnets is adjusted. Whether it is a distance sensor or a piezoelectric sensor, the control accuracy can be improved to ensure the working state of the pitch bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The schematic diagrams in the specification forming a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0029] Figure 1 is a sectional view of a pitch bearing in the prior art.

[0030] Figure 2 is a schematic diagram of a cross-section of a pitch bearing based on magnetic force support according to one or more embodiments of the present invention.

[0031] Figure 3 is a schematic diagram of the detection principle when a piezoelectric sensor is used in a pitch bearing based on magnetic force support according to one or more embodiments of the present invention.

[0032] Figure 4 is a relationship diagram between the current of the piezoelectric sensor and the magnitude of the detected pressure in a pitch bearing based on magnetic force support according to one or more embodiments of the present invention.

[0033] Figure 5 This is the circuit schematic diagram of a pitch bearing based on magnetic support according to one or more embodiments of the present invention.

[0034] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0035] Wherein: 1 - upper sleeve of the pitch bearing outer ring, 2 - lower sleeve of the pitch bearing outer ring; 3 - inner ring of the pitch bearing; 4 - radial roller of the pitch bearing; 5 - axial roller of the pitch bearing, 6 - first electromagnet, 7 - second electromagnet;

[0036] 6 - 1. First outer ring electromagnet, 6 - 2. First inner ring electromagnet;

[0037] 7 - 1. Second outer ring electromagnet, 7 - 2. Second inner ring electromagnet. Detailed implementation manners

[0038] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the present invention clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0040] As introduced in the background art, in the prior art, the pitch bearing structure has the problem of poor buffering effect on impact loads. To solve the above technical problems, the present invention proposes a pitch bearing based on magnetic support.

[0041] Embodiment 1

[0042] In a typical embodiment of the present invention, refer to Figure 2As shown in the figure, a pitch bearing based on magnetic support includes a first electromagnet 6 disposed on two raceway surfaces of the axial raceway of the pitch bearing and a second electromagnet 7 disposed on two raceway surfaces of the radial raceway of the pitch bearing. It also includes a first distance sensor disposed in the axial raceway of the pitch bearing and a second distance sensor disposed in the radial raceway of the pitch bearing. The first electromagnet 6, the first distance sensor, the second electromagnet 7, and the second distance sensor are separately connected to the controller. The repulsive forces generated between the first electromagnets 6 and between the second electromagnets 7 provide opposite-direction acting forces for the inner ring of the pitch bearing. The first distance sensor and the second distance sensor send the detected data to the controller, and the controller adjusts the current magnitudes of the first electromagnet and the second electromagnet so that the distance of the axial raceway is within a first set range and the distance of the radial raceway is within a second set range.

[0043] It should be noted that the axial raceway of the pitch bearing includes an upper raceway and a lower raceway, and the first electromagnet and the first distance sensor are disposed in the upper raceway and the lower raceway.

[0044] It is easily understood that the first electromagnet 6 includes two parts. One part is the first outer-ring electromagnet 6-1 embedded in the outer ring of the pitch bearing, and the other part is the first inner-ring electromagnet 6-2 embedded in the inner ring of the pitch bearing. The first outer-ring electromagnet 6-1 and the first inner-ring electromagnet 6-2 in the axial raceway of the pitch bearing are arranged oppositely, and in the energized state, the first outer-ring electromagnet and the first inner-ring electromagnet are like-named magnetic poles.

[0045] Because the size of one circle of the pitch bearing is relatively large, considering the manufacturing cost and convenience, along one circle of the axial raceway of the pitch bearing, multiple pieces of the first outer-ring electromagnet 6-1 are provided, and the interval distance is set between adjacent two pieces of the first outer-ring electromagnet 6-1. Similarly, multiple pieces of the first inner-ring electromagnet 6-2 are provided, and the interval distance is set between adjacent two pieces of the first inner-ring electromagnet 6-2. The first inner-ring electromagnet 6-2 and the first outer-ring electromagnet 6-1 are in one-to-one correspondence, and the repulsive force is generated between the first inner-ring electromagnet and the first outer-ring electromagnet arranged up and down during the working process. The first distance sensor is disposed between adjacent two first outer-ring electromagnets or adjacent two first inner-ring electromagnets, and the first distance sensor is used to obtain the distance between the two raceway surfaces in the upper raceway or the lower raceway.

[0046] Thus, for the upper raceway, grooves are provided on the axial surface of the outer ring of the pitch bearing sleeve 1, and first outer ring electromagnets are respectively embedded in the grooves. Grooves are also provided on the upper axial surface of the inner ring 3 of the pitch bearing, and first inner ring electromagnets are respectively embedded in the corresponding grooves. For the lower raceway, grooves are provided on the axial surface of the lower sleeve 2 of the outer ring of the pitch bearing, and the corresponding first outer ring electromagnets are respectively embedded in the grooves. Grooves are also provided on the lower axial surface of the inner ring 3 of the pitch bearing, and first inner ring electromagnets are respectively embedded in the corresponding grooves. Each electromagnet extends beyond the corresponding groove, and the provision of the grooves changes the line contact between the rollers and the raceway into the surface contact between the electromagnets and the raceway.

[0047] Correspondingly, in the radial raceway of the pitch bearing, the second electromagnet 7 includes two parts. One part is the second outer ring electromagnet 7-1 embedded in the outer ring of the pitch bearing, and the other part is the second inner ring electromagnet 7-2 embedded in the inner ring of the pitch bearing. The second outer ring electromagnet 7-1 and the second inner ring electromagnet 7-2 in the axial raceway of the pitch bearing are arranged oppositely. The second outer ring electromagnet 7-1 is embedded in the inner side surface of the upper sleeve 1 of the outer ring of the pitch bearing, and the second inner ring electromagnet 7-2 is embedded in the inner ring 3 of the pitch bearing.

[0048] Specifically, considering the large size of the pitch bearing, for the convenience of manufacturing and processing, along the radial raceway of the pitch bearing, multiple pieces are provided in the second outer ring electromagnet, and the distance between adjacent two second outer ring electromagnets is set. The second inner ring electromagnet includes multiple pieces, and the distance between adjacent two second inner ring electromagnets is set. The second inner ring electromagnet corresponds to the second outer ring electromagnet one by one. The second distance sensor is arranged between adjacent two second outer ring electromagnets or adjacent two second inner ring electromagnets, and the distance between the two raceway surfaces in the radial raceway is obtained through the second distance sensor.

[0049] It is easily understood that the distance sensor is an existing ultrasonic ranging sensor or other types of ranging sensors. To ensure the accuracy of the measurement results, one or more first ranging sensors are provided in the axial raceway, and one or more second distance sensors are provided in the radial raceway. The controller is the control center of the wind turbine tower. One ranging sensor is provided in one raceway. In some other examples, multiple ranging sensors are provided in one raceway. The set values corresponding to each raceway are stored in the controller. The distance value between the upper and lower surfaces of the same raceway (i.e., the distance value between the electromagnets on both sides of the raceway) is measured by the ranging sensor. The controller compares the distance value measured by the distance sensor with the corresponding set value, and adjusts the current magnitudes of the corresponding electromagnets on both sides of the distance sensor according to the deviation amount, so as to make the measured distance of the distance sensor approach the set distance, and to ensure the best performance of the pitch bearing.

[0050] During operation, the first electromagnet and the second electromagnet are always in the energized state, generating mutual repulsive forces. In the axial direction, the blade-side raceway ( Figure 2The first electromagnet at the upper-middle side raceway) and the second electromagnet at the hub side raceway ( Figure 2 the lower-middle side raceway) respectively provide opposite acting forces for the inner ring of the pitch bearing, changing the line contact between the rollers and the raceway to the surface contact between the electromagnets and the raceway. The form is more stable, the stress condition is better, ensuring the reliability of the overall structure and reducing the requirements for the raceway.

[0051] It should be explained that the first distance sensor and the second distance sensor are evenly arranged in the corresponding raceways. The first distance sensor and the second distance sensor are responsible for monitoring the distance from one side raceway surface to the corresponding raceway surface in each raceway. When the external wind load fluctuates, each distance sensor will detect a change in the distance to the opposite raceway surface. In this case, the controller appropriately increases or decreases the current flowing to the first electromagnet 6 and the second electromagnet 7 according to the positive or negative and magnitude of the change in the distance value, so that the electromagnetic repulsion is correspondingly increased or decreased, and then the size of the raceway gap is kept consistent, enabling the pitch bearing to operate smoothly.

[0052] Embodiment 2

[0053] The difference between this embodiment and Embodiment 1 is that:

[0054] The first distance sensor can be replaced by a first piezoelectric sensor, and the second distance sensor can be replaced by a second piezoelectric sensor. The first piezoelectric sensor and the second piezoelectric sensor are separately connected to the controller.

[0055] In this embodiment, both the first piezoelectric sensor and the second piezoelectric sensor are non-contact piezoelectric sensors. The piezoelectric sensor is based on the piezoelectric effect, that is, under the action of pressure or strain, a charge distribution is generated, thereby generating a potential difference, that is, it can generate an electrical signal for output.

[0056] Reference Figure 3 and Figure 4 As shown, after the electromagnet is energized, each piezoelectric sensor is used to obtain relevant pressure values. When the pressure value obtained by the piezoelectric sensor is less than 0.4 times the static pressure, the controller controls to slowly increase the current until the pressure value obtained by the piezoelectric sensor is approximately zero. If so, it means that the gap between the main frame and the yaw gear ring is less than 1 mm, and the current magnitude is kept unchanged. If not, the current is continued to be slowly increased.

[0057] Embodiment 3

[0058] The difference between this embodiment and Embodiment 1 is that:

[0059] The pitch bearing further includes a first piezoelectric sensor and a second piezoelectric sensor. The first piezoelectric sensor is also disposed in the axial raceway of the pitch bearing, and the second piezoelectric sensor is disposed in the radial raceway of the pitch bearing. The first piezoelectric sensor and the second piezoelectric sensor are separately connected to the controller. The first piezoelectric sensor and the first distance sensor are spaced apart in the axial raceway of the pitch bearing, and the second piezoelectric sensor and the second distance sensor are spaced apart in the radial raceway of the pitch bearing.

[0060] Reference Figure 5 As shown, the controller receives the information from the first piezoelectric sensor, the first distance sensor, the second piezoelectric sensor, and the second distance sensor. All the sensors arranged in a circle along the axial raceway are to ensure the accuracy of the results. If one of them has a problem, the other sensors can still send signals normally.

[0061] Embodiment 4

[0062] This embodiment provides a working method for a pitch bearing based on magnetic support, including the following content:

[0063] A first electromagnet is arranged on the two raceway surfaces of the axial raceway of the pitch bearing, a second electromagnet is arranged on the two raceway surfaces of the radial raceway of the pitch bearing, a first distance sensor is arranged in the axial raceway of the pitch bearing, and a second distance sensor is arranged in the radial raceway of the pitch bearing;

[0064] The first distance sensor detects the distance between the two raceway surfaces of the axial raceway of the pitch bearing and sends it to the controller. When the controller determines that the distance between the two raceway surfaces of the axial raceway of the pitch bearing becomes smaller, it controls the first electromagnet to increase the current. If the controller determines that the distance between the two raceway surfaces of the axial raceway of the pitch bearing increases, it controls the first electromagnet to decrease the current;

[0065] The second distance sensor detects the distance between the two raceway surfaces of the radial raceway of the pitch bearing and sends it to the controller. When the controller determines that the distance between the two raceway surfaces of the radial raceway of the pitch bearing becomes smaller, it controls the second electromagnet to increase the current. If the controller determines that the distance between the two raceway surfaces of the radial raceway of the pitch bearing increases, it controls the second electromagnet to decrease the current.

[0066] It should be noted that during the pitch process, the inner ring 2 of the pitch bearing rotates relative to the outer ring of the pitch bearing. During this process, the electromagnets fixed to the inner ring of the pitch bearing and the electromagnets fixed to the outer ring of the pitch bearing will have a reduced or increased facing area due to being staggered, resulting in fluctuations in the magnitude of the electromagnetic repulsion force received by the inner ring of the pitch bearing. At this time, it is necessary to detect through a distance sensor. If the distance decreases, it means that the repulsion force it gives is small and the force to counteract the loaded force is insufficient, then quickly increase the current to generate a larger repulsion force to quickly counteract the excessive pressure between the raceways. During this process, if the distance sensor detects that the distance has reached the standard value, then reduce the rate of increase of the current until the distance reaches the standard value range and the current stops increasing. Vice versa, during the pitch process, if the distance sensor detects that the distance is too large, it means that the repulsion force it gives is too large. At this time, it is necessary to quickly reduce the current to reduce its repulsion force until the distance reaches the standard value and then stop reducing the current.

[0067] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A variable pitch bearing based on magnetic support, characterized in that It includes a first electromagnet disposed on two raceway surfaces of the pitch bearing axial raceway and a second electromagnet disposed on two raceway surfaces of the pitch bearing radial raceway. It also includes a first distance sensor disposed in the pitch bearing axial raceway and a second distance sensor disposed in the pitch bearing radial raceway. The first electromagnet, the first distance sensor, the second electromagnet, and the second distance sensor are separately connected to the controller. Repulsive forces generated between the first electromagnets and between the second electromagnets provide acting forces in opposite directions for the inner ring of the pitch bearing. The first distance sensor and the second distance sensor send the detected data to the controller, and the controller adjusts the current magnitudes of the first electromagnet and the second electromagnet so that the distance of the axial raceway is within a first set range and the distance of the radial raceway is within a second set range.

2. The pitch bearing based on magnetic support according to claim 1, characterized in that The first distance sensor can be replaced by a first piezoelectric sensor, and the second distance sensor can be replaced by a second piezoelectric sensor. The first piezoelectric sensor and the second piezoelectric sensor are separately connected to the controller.

3. The pitch bearing based on magnetic support according to claim 1, characterized in that, It also includes a first piezoelectric sensor and a second piezoelectric sensor. The first piezoelectric sensor is also disposed in the pitch bearing axial raceway, and the second piezoelectric sensor is disposed in the pitch bearing radial raceway. The first piezoelectric sensor and the second piezoelectric sensor are separately connected to the controller.

4. The pitch bearing based on magnetic support according to claim 3, characterized in that The first piezoelectric sensor and the first distance sensor are spaced apart and disposed in the pitch bearing axial raceway, and the second piezoelectric sensor and the second distance sensor are spaced apart and disposed in the pitch bearing radial raceway.

5. A pitch bearing based on magnetic support according to claim 1, characterized in that, The first electromagnet includes two parts. One part is a first outer-ring electromagnet embedded in the outer ring of the pitch bearing, and the other part is a first inner-ring electromagnet embedded in the inner ring of the pitch bearing. The first outer-ring electromagnet and the first inner-ring electromagnet in the pitch bearing axial raceway are oppositely arranged.

6. The pitch bearing based on magnetic support according to claim 5, characterized in that, Along the pitch bearing axial raceway, multiple pieces of the first outer-ring electromagnet are provided, and the distance between adjacent two pieces of the first outer-ring electromagnet is set at intervals. Multiple pieces of the first inner-ring electromagnet are also provided, and the distance between adjacent two pieces of the first inner-ring electromagnet is set at intervals. The first inner-ring electromagnet corresponds to the first outer-ring electromagnet one by one, and the first distance sensor is disposed between adjacent two pieces of the first outer-ring electromagnet or between adjacent two pieces of the first inner-ring electromagnet.

7. The pitch bearing based on magnetic support according to claim 1, wherein, The second electromagnet includes two parts. One part is a second outer-ring electromagnet embedded in the outer ring of the pitch bearing, and the other part is a second inner-ring electromagnet embedded in the inner ring of the pitch bearing. The second outer-ring electromagnet and the second inner-ring electromagnet in the pitch bearing axial raceway are oppositely arranged.

8. A pitch bearing based on magnetic support according to claim 7, characterized in that, Along the pitch bearing radial raceway, multiple pieces are provided in the second outer-ring electromagnet, and the distance between adjacent two pieces of the second outer-ring electromagnet is set at intervals. The second inner-ring electromagnet includes multiple pieces, and the distance between adjacent two pieces of the second inner-ring electromagnet is set at intervals. The second inner-ring electromagnet corresponds to the second outer-ring electromagnet one by one, and the second distance sensor is disposed between adjacent two pieces of the second outer-ring electromagnet or between adjacent two pieces of the second inner-ring electromagnet.

9. The pitch bearing based on magnetic support according to claim 1, wherein The axial raceway of the pitch bearing includes an upper raceway and a lower raceway, and the first electromagnet and the first distance sensor are arranged in the upper raceway and the lower raceway.

10. A working method of a pitch bearing based on magnetic support according to any one of claims 1-9, characterized in that, It includes the following content: A first electromagnet is arranged on the two raceway surfaces of the axial raceway of the pitch bearing, a second electromagnet is arranged on the two raceway surfaces of the radial raceway of the pitch bearing, a first distance sensor is arranged in the axial raceway of the pitch bearing, and a second distance sensor is arranged in the radial raceway of the pitch bearing; The first distance sensor detects the distance between the two raceway surfaces of the axial raceway of the pitch bearing and sends it to the controller. When the controller determines that the distance between the two raceway surfaces of the axial raceway of the pitch bearing becomes smaller, it controls the first electromagnet to increase the current. If the controller determines that the distance between the two raceway surfaces of the axial raceway of the pitch bearing increases, it controls the first electromagnet to decrease the current; The second distance sensor detects the distance between the two raceway surfaces of the radial raceway of the pitch bearing and sends it to the controller. When the controller determines that the distance between the two raceway surfaces of the radial raceway of the pitch bearing becomes smaller, it controls the second electromagnet to increase the current. If the controller determines that the distance between the two raceway surfaces of the radial raceway of the pitch bearing increases, it controls the second electromagnet to decrease the current.

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