Rotor assembly and permanent magnet wind turbine using it

Abstract

This invention discloses a rotor assembly and a permanent magnet wind turbine generator using the same. The rotor assembly includes a rotor housing, several magnetic pole modules, and several pressure bars. The inner wall of the rotor housing has several protrusions extending axially along the rotor housing and distributed circumferentially around the rotor housing. A groove is formed between adjacent protrusions. The magnetic pole modules are disposed in the grooves. The sidewalls of the grooves are used to abut against the sides of the magnetic pole modules to restrict the movement of the magnetic pole modules along the circumferential direction of the rotor housing. Each side of the pressure bar has at least one protruding stop. The pressure bar is connected to the protrusions. The stop is located at the opening of the groove and blocks part of the magnetic pole modules. The protrusions themselves bear a strong tangential force from the magnetic pole modules. The pressure bars restrict the radial movement of the magnetic pole modules. The pressure bars bear a relatively small force, reducing the load on the pressure bars and solving the problem that excessive force can easily cause the pressure bars and magnetic pole modules to detach from the rotor housing.

Description

Technical Field

[0001] This invention relates to the field of wind turbines, and particularly to a rotor assembly and a permanent magnet wind turbine using the same. Background Technology

[0002] Large permanent magnet wind turbine rotors are equipped with multiple magnetic pole modules. During generator operation, the magnetic pole modules are prone to detaching from the rotor due to the influence of gravity, vibration, and alternating electromagnetic forces in the working environment, which affects the safe and reliable operation of the motor. Therefore, the method of fixing the magnetic pole modules of permanent magnet wind turbines is very critical.

[0003] In the existing technology, the magnetic pole module is usually fixed to the rotor by bolts, adhesive, or resin curing. The above solutions have obvious defects. The magnetic pole module is prone to vibration in the alternating magnetic field. The resulting load will be directly transmitted to the existing connecting parts such as bolts or adhesives. Under long-term influence, the existing connecting parts are prone to failure, damage or detachment, causing the magnetic pole module to detach from the rotor, which can easily lead to safety accidents. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art where the connecting parts of the magnetic pole module are prone to failure, which makes the magnetic pole module easy to detach from the rotor housing.

[0005] To solve the above-mentioned technical problems, the present invention provides a rotor assembly and a permanent magnet wind turbine.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A rotor assembly includes a rotor housing, a plurality of magnetic pole modules, and a plurality of pressure bars; the inner wall of the rotor housing has a plurality of protrusions extending along the axial direction of the rotor housing, and the plurality of protrusions are distributed around the circumference of the rotor housing, a groove is formed between two adjacent protrusions, the magnetic pole modules are disposed in the grooves, and the sidewalls of the grooves are used to abut against the sidewalls of the magnetic pole modules to restrict the movement of the magnetic pole modules along the circumference of the rotor housing; each side of the pressure bar has at least one protruding stop, the pressure bar is connected to the protrusions, and the stop holds the magnetic pole modules in place.

[0007] In this design, the sidewall of the groove is used to restrict the circumferential movement of the magnetic pole module. The protrusion itself bears the strong tangential force from the magnetic pole module, while the pressure bar does not provide tangential force to the magnetic pole module. The pressure bar only needs to restrict the radial movement of the magnetic pole module. In this direction, the pressure bar bears a smaller force. Therefore, overall, this design greatly reduces the load on the pressure bar, reduces the risk of the pressure bar detaching from the protrusion, greatly improves safety, and solves the problem of the pressure bar and magnetic pole module easily detaching from the rotor housing due to excessive force.

[0008] Preferably, a first gap is formed between the side of the pressure strip and the magnetic pole module, and a second gap is formed between the side of the magnetic pole module and the side wall of the groove, wherein the first gap is larger than the second gap.

[0009] In this design, during rotation, the magnetic pole module moves circumferentially within the groove. Since the first gap is larger than the second gap, the magnetic pole module will first touch the side wall of the groove without touching the pressure bar, thus preventing the magnetic pole module from contacting the pressure bar and ensuring the firmness of the pressure bar locked to the protrusion.

[0010] Preferably, the blocks on both sides of the pressure strip are arranged asymmetrically.

[0011] In this scheme, the stop block and the magnetic pole module attract each other. Because the stop block is asymmetrically distributed on both sides of the pressure bar, the magnetic attraction force on the left and right sides of the magnetic pole module is different, so that the magnetic pole module is subjected to a circumferential magnetic field force, and is not prone to circumferential vibration under alternating electromagnetic force.

[0012] Preferably, the number of stops on one side of the pressure strip is greater than the number of stops on the other side.

[0013] In this scheme, since the number of blocks on both sides of the pressure bar is different, the side with more blocks provides a greater magnetic attraction force, so that the magnetic pole module is subjected to a circumferential magnetic field force, reducing the risk of circumferential vibration of the magnetic pole module 11.

[0014] Preferably, the two sides of the pressure bar are defined as the head end and the tail end, respectively. The direction from the head end to the tail end is consistent with the direction of rotor rotation, and the number of the stops distributed at the tail end is greater than the number of the stops distributed at the head end.

[0015] In this design, during rotor rotation, the stop block attracts the magnetic pole module through magnetic field force. The direction of the magnetic field force is opposite to the direction of rotation of the magnetic pole module, so that the magnetic pole module is stably confined in the groove, which helps to reduce the circumferential vibration of the magnetic pole module.

[0016] Preferably, the top of the magnetic pole module is recessed toward the inner wall of the rotor housing to form a stepped portion accommodated in the groove, and the stop extends toward the magnetic pole module and covers the stepped portion.

[0017] In this design, the stop block covers the stepped portion, preventing the magnetic pole module from detaching radially from the groove in the inner wall of the rotor housing.

[0018] Preferably, the thickness of the step portion is less than the thickness of the protrusion, so that a third gap is formed between the bottom of the stop block and the top of the step portion.

[0019] In this design, due to the presence of the third gap, the magnetic pole module will not directly contact the pressure bar, thereby greatly reducing the radial pressure on the pressure bar. The pressure bar is subjected to a smaller load and is less likely to detach from the protrusion.

[0020] Preferably, the magnetic pole module is cut radially along the rotor housing, forming a T-shaped cross-section.

[0021] In this design, the magnetic pole module has a simple structure and is easy to manufacture.

[0022] Preferably, the pressure strip and the protrusion are connected by bolts or glue; and / or, the pressure strip is integrally formed.

[0023] This solution provides a specific connection method between the pressure strip and the protrusion. The pressure strip and the stop block are integrally formed, which can increase the bonding strength between the pressure strip and the stop block.

[0024] A permanent magnet wind turbine generator includes the rotor assembly described above.

[0025] In this design, the permanent magnet wind turbine uses the aforementioned rotor assembly, with the magnetic pole module securely mounted in the rotor housing, thus increasing the safety of the permanent magnet wind turbine.

[0026] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0027] The positive and progressive effects of this invention are as follows: the sidewall of the groove is used to restrict the circumferential movement of the magnetic pole module, the protrusion itself bears the strong tangential force from the magnetic pole module, while the pressure bar does not provide tangential force to the magnetic pole module. The pressure bar only needs to restrict the radial movement of the magnetic pole module, and in this direction, the pressure bar bears a smaller force. Therefore, overall, this device greatly reduces the load on the pressure bar, reduces the risk of the pressure bar detaching from the protrusion, and greatly improves safety. There is no need to set a large number of bolts or other connecting components between the pressure bar and the protrusion, which reduces the complexity of the device and solves the problem that the pressure bar and the magnetic pole module are prone to detaching from the rotor housing due to excessive force. Attached Figure Description

[0028] Figure 1 This is a partially enlarged schematic diagram of an embodiment of the rotor assembly of the present invention.

[0029] Figure 2 for Figure 1 Sectional view at point AA.

[0030] Figure 3 for Figure 2 A magnified structural diagram at point B in the middle.

[0031] Figure 4 This is a partial structural diagram of the rotor house in this invention.

[0032] Figure 5 This is a schematic diagram of the magnetic pole module in this invention.

[0033] Figure 6 This is a schematic diagram of the pressure strip in this invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] Rotor House 10

[0036] Magnetic pole module 11

[0037] 12 strips

[0038] Convex 13

[0039] Groove 14

[0040] Block 15

[0041] First gap 16

[0042] Second gap 17

[0043] Head 18

[0044] Tail end 19

[0045] Step 20

[0046] Third gap 21 Detailed Implementation

[0047] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0048] Figures 1-6 The illustration shows an embodiment of a rotor assembly according to the present invention, such as... Figure 1 As shown, it includes a rotor housing 10, several magnetic pole modules 11 and several pressure strips 12; the inner wall of the rotor housing 10 has several protrusions 13, which extend along the axial direction of the rotor housing 10 and are distributed around the circumference of the rotor housing 10. A groove 14 is formed between two adjacent protrusions 13, and the magnetic pole modules 11 are disposed in the groove 14. In specific implementation, multiple magnetic pole modules 11 are arranged in the same groove 14.

[0049] The sidewall of the groove 14 is used to abut against the side of the magnetic pole module 11 to restrict the circumferential movement of the magnetic pole module 11 along the rotor housing 10, such as... Figure 2 The X direction shown or the opposite direction of X is the circumferential movement direction of the magnetic pole module 11 within the groove 14.

[0050] A pressure strip 12 is disposed on the protrusion 13, and each side of the pressure strip 12 has at least one protruding stop 15, which is located at the opening of the groove 14 and locks the magnetic pole module 11. Figure 2As shown, the Y direction is the radial direction of the rotor housing 10, and the stop block 15 is used to restrict the magnetic pole module 11 from moving along the Y direction and disengaging from the groove 14.

[0051] In this example, the sidewall of the groove 14 is used to restrict the circumferential movement of the magnetic pole module 11, and the protrusion 13 itself bears a strong tangential force from the magnetic pole module 11, the direction of which is... Figure 2 The direction indicated by X or the opposite of X is not specified. The pressure bar 12 does not provide tangential force to the magnetic pole module 11. The pressure bar 12 only needs to restrict the radial movement of the magnetic pole module 11. In this direction, the pressure bar 12 bears a small force. Therefore, this solution greatly reduces the load on the pressure bar 12, reduces the risk of the pressure bar 12 detaching from the protrusion 13, greatly improves safety, and solves the problem that the pressure bar 12 and the magnetic pole module 11 are easily detached from the rotor housing 10 due to excessive force.

[0052] like Figure 3 As shown, preferably, a first gap 16 is formed between the side of the pressure strip 12 and the magnetic pole module 11, and a second gap 17 is formed between the side of the magnetic pole module 11 and the side wall of the groove 14, wherein the first gap 16 is larger than the second gap 17.

[0053] In this example, during rotation, the magnetic pole module 11 moves circumferentially within the groove 14. Since the first gap 16 is larger than the second gap 17, the magnetic pole module 11 will first touch the side wall of the groove 14 without touching the pressure strip 12, thereby preventing the magnetic pole module 11 from contacting the pressure strip 12 and ensuring the firmness of the pressure strip 12 locked to the protrusion 13.

[0054] like Figure 6 As shown, preferably, the blocks 15 on both sides of the pressure strip 12 are arranged asymmetrically.

[0055] In this example, the stop block 15 is made of magnetic material and attracts the magnetic pole module 11. Since the stop block 15 is asymmetrically distributed on both sides of the pressure strip 12, the magnetic attraction force on the left and right sides of the magnetic pole module 11 is different, so that the magnetic pole module 11 is subjected to a circumferential magnetic field force and is not prone to circumferential vibration under alternating electromagnetic force.

[0056] Preferably, the number of stops 15 on one side of the pressure strip 12 is greater than the number of stops 15 on the other side.

[0057] In this example, since the number of blocks on both sides of the pressure bar is different, the side with more blocks provides a greater magnetic attraction force, so that the magnetic pole module 11 is subjected to a circumferential magnetic field force, reducing the risk of circumferential vibration of the magnetic pole module 11.

[0058] like Figure 6 As shown, preferably, the two sides of the pressure bar 12 are defined as the head end 18 and the tail end 19, respectively, and the direction from the head end 18 to the tail end 19 is consistent with the rotor rotation direction. Figure 6 The direction V shown is the direction of rotor rotation, and the number of stop blocks 15 at the tail end 19 is greater than the number of stop blocks 15 at the head end 18.

[0059] In this example, during the rotation of the rotor, the stop block 15 attracts the magnetic pole module 11 through the magnetic field force. The direction of the magnetic field force is opposite to the direction of rotation of the magnetic pole module 11, so that the magnetic pole module 11 is stably confined in the groove 14, which helps to reduce the circumferential vibration of the magnetic pole module 11.

[0060] The top of the magnetic pole module 11 is recessed toward the inner wall of the rotor house to form a step portion 20 that is accommodated in the groove 14. The stop block 15 extends along the direction of the magnetic pole module 11 and covers the step portion 20 to prevent the magnetic pole module 11 from detaching radially from the groove 14 of the inner wall of the rotor house 10.

[0061] like Figure 5 As shown, in this embodiment, the magnetic pole module 11 is a T-shaped strip, that is, the magnetic pole module 11 is cut radially along the rotor head. The magnetic pole module 11 has a T-shaped cross section, and the larger end of the T-shaped structure is set in the groove 14. The above structure is simple and easy to process.

[0062] like Figure 2 As shown, the thickness of the step portion 20 is less than the thickness of the protrusion 13, so that a third gap 21 is formed between the bottom of the stop block 15 and the top of the step portion 20.

[0063] In this example, due to the presence of the third gap 21, the magnetic pole module 11 will not directly contact the pressure bar 12, thereby greatly reducing the radial pressure on the pressure bar 12. The load on the pressure bar 12 is small, and it is not easy to detach from the protrusion 13.

[0064] In other embodiments of this application, the bottom of the stop 15 directly abuts against the top of the step portion 20, and there is no gap between the two.

[0065] like Figure 4 As shown, the protrusion 13 is elongated and is cut radially along the rotor housing 10 to form a rectangular cross-section. In this example, the protrusion 13 is specifically cuboid in shape, which is easy to process and has a lower manufacturing cost. A rectangular groove 14 is formed between two adjacent protrusions 13. The bottom wall of the groove 14 is perpendicular to the radial direction of the rotor housing 10, and the side wall of the groove 14 is perpendicular to the bottom wall, which facilitates the placement of the T-shaped magnetic pole module 11 in the groove 14.

[0066] Preferably, the pressure strip 12 and the protrusion 13 are connected by bolts or glue. It should be noted that the connection method between the pressure strip 12 and the protrusion 13 is not limited to the above examples. For example, the connection between the pressure strip 12 and the protrusion 13 can also be welding, riveting, or hook connection.

[0067] Preferably, the pressure strip 12 is integrally formed. In specific implementation, the pressure strip 12 can be integrally processed by stamping, laser cutting or wire cutting.

[0068] In this example, a specific connection method between the pressure strip 12 and the protrusion 13 is provided. The pressure strip 12 and the stop block 15 are integrally formed, which can increase the bonding strength between the pressure strip 12 and the stop block 15.

[0069] In other embodiments of this application, the material of the pressure strip 12 may also be a non-magnetic material, such as aluminum alloy or stainless steel, to reduce the magnetic flux from the magnetic pole module 11 to the pressure strip 12, increase the magnetic flux between the magnetic pole module 11 and the rotor housing 10, thereby increasing the attraction between the magnetic pole module 11 and the rotor housing 10 and improving the installation stability of the magnetic pole module 11.

[0070] A permanent magnet wind turbine generator includes the rotor assembly described above.

[0071] In this example, the permanent magnet wind turbine uses the rotor assembly described above, and the magnetic pole module 11 is securely mounted on the rotor housing 10, which increases the safety of the permanent magnet wind turbine.

[0072] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A rotor assembly characterized by: It includes a rotor housing, several magnetic pole modules, and several pressure bars; The inner wall of the rotor housing has several protrusions that extend along the axial direction of the rotor housing and are distributed around the circumference of the rotor housing. A groove is formed between two adjacent protrusions. The magnetic pole module is disposed in the groove. The sidewall of the groove is used to abut against the side of the magnetic pole module to restrict the movement of the magnetic pole module along the circumference of the rotor housing. The pressure bar has at least one protruding stop on each side, the pressure bar is connected to the protrusion, and the stop locks the magnetic pole module. A first gap is formed between the side of the pressure strip and the magnetic pole module, and a second gap is formed between the side of the magnetic pole module and the side wall of the groove. The first gap is larger than the second gap. The two sides of the pressure bar are defined as the head end and the tail end, respectively. The direction from the head end to the tail end is consistent with the tangential direction of the rotor rotation direction. The number of the stops distributed at the tail end is greater than the number of the stops distributed at the head end.

2. The rotor assembly of claim 1, wherein: The blocks on both sides of the pressure strip are arranged asymmetrically.

3. The rotor assembly as claimed in claim 1, characterized in that: The number of blocks on one side of the pressure strip is greater than the number of blocks on the other side.

4. The rotor assembly as claimed in claim 1, characterized in that: The top of the magnetic pole module is recessed towards the inner wall of the rotor housing to form a stepped portion that is accommodated in the groove, and the stop extends in the direction close to the magnetic pole module and covers the stepped portion.

5. The rotor assembly as claimed in claim 4, characterized in that: The thickness of the step portion is less than the thickness of the protrusion, and a third gap is formed between the bottom of the stop block and the top of the step portion.

6. The rotor assembly as claimed in claim 5, characterized in that: The magnetic pole module is cut radially along the rotor housing, forming a T-shaped cross-section.

7. The rotor assembly as claimed in claim 1, characterized in that: The pressure strip is connected to the protrusion by bolts or glue; and / or, the pressure strip is integrally formed.

8. A permanent magnet wind turbine generator, characterized in that: It includes the rotor assembly as described in any one of claims 1-7.

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