A disc-type variable pitch motor and a wind turbine

Abstract

The utility model provides a kind of disc type variable pitch motor and wind turbine unit, disc type variable pitch motor includes motor casing, motor rotor, motor stator, brake, motor casing is provided with the connecting flange of connection reduction gearbox;Motor rotor is provided with the rotating shaft of transmission connection with the input shaft of reduction gearbox and multiple magnets around rotating shaft;Motor stator is set on motor casing, and motor stator includes multiple stator windings, and multiple stator windings are opposite in the axial direction of rotating shaft with multiple magnets;Brake is set on motor casing, and brake is used to brake motor rotor.The utility model's wind turbine unit's variable pitch system uses the disc type variable pitch motor of axial excitation, and the disc type variable pitch motor is small, and weight is light, and the variable frequency driving current required is smaller under the same angular acceleration, and the specification and cost of variable frequency driver can be reduced;Meanwhile, the volume of disc type variable pitch motor is compact, and weight is reduced, and the cost of installation and on-site replacement of disc type variable pitch motor is also reduced.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment technology, and in particular to a disc-type variable pitch motor and a wind turbine. Background Technology

[0002] Wind turbines are rapidly advancing towards the megawatt level, with single-unit capacities reaching 8-15MW or even higher. The longer blades and higher loads of wind turbines place a rigid demand on pitch systems to achieve "greater output torque and lower inertia." As the sole actuator for blade pitch adjustment, the dynamic performance of the pitch motor directly determines the turbine's load safety, power generation, and lifespan. The existing pitch motor design for wind turbines, which commonly uses a "variable frequency drive + radial flux permanent magnet synchronous inner rotor" scheme, has several drawbacks.

[0003] For example, excessive moment of inertia leads to insufficient dynamic performance. At the 250Nm@1000rpm specification, the existing pitch motor has a moment of inertia of about 0.39kg·m², while the new generation platform requires the pitch motor to have a moment of inertia of no more than 0.1kg·m². Excessive inertia will cause a surge in current during acceleration, forcing the driver capacity to be increased by 1.5 to 2 levels, directly increasing the system cost.

[0004] For example, the size and weight are out of control, making installation and maintenance difficult. To obtain sufficient torque, radial flux motors can only have their core lengthened or their outer diameter increased, with a single unit generally weighing over 65kg and having an axial length exceeding 400mm. The space inside the hub is narrow, and on-site replacement requires the use of large cranes, which multiplies labor costs.

[0005] For example, costs increase exponentially. High motor inertia leads to high driver power, reinforced wheel hubs, and extended hoisting windows, causing costs at each stage to rise exponentially and severely weakening the cost-per-kilowatt-hour advantage of large-megawatt models. Utility Model Content

[0006] The purpose of this utility model is to provide a disc-type variable pitch motor and a wind turbine unit, which aims to solve the problem of many drawbacks of the existing variable pitch motors in wind turbine units.

[0007] To solve the above-mentioned technical problems, the present invention provides a disc-type pitch motor, comprising: The motor housing has a connecting flange at one end for connecting to the gearbox; The motor rotor has a rotating shaft for driving connection with the input shaft of the gearbox on its surface near the connecting flange, and a plurality of magnets arranged along the rotation direction of the motor rotor and surrounding the rotating shaft. The motor stator is disposed on the motor housing and includes a plurality of stator windings arranged along the rotation direction of the motor rotor, wherein the plurality of stator windings and a plurality of magnets are axially opposite to the rotating shaft. A brake is mounted on the motor housing and is used to brake the motor rotor.

[0008] To achieve the above objectives, this utility model also provides a wind turbine unit, comprising: Gearbox; A disc-type pitch motor, wherein the disc-type pitch motor is the aforementioned disc-type pitch motor, the disc-type pitch motor is mounted on the gearbox via a connecting flange, and the rotating shaft of the disc-type pitch motor is drively connected to the input shaft of the gearbox.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The pitch system of the wind turbine of this utility model adopts an axially excited disc pitch motor. The disc pitch motor has a small moment of inertia and light weight, and requires less variable frequency drive current under the same angular acceleration, which can reduce the specifications and cost of the variable frequency drive. At the same time, the disc pitch motor is compact and lightweight, which also reduces the cost of installation and on-site replacement of the disc pitch motor. Attached Figure Description

[0010] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0011] Figure 1 This is a cross-sectional view of the disc-type pitch motor in the first embodiment of this utility model; Figure 2 for Figure 1 Exploded view of a mid-disc pitch motor; Figure 3 This is a cross-sectional view of the disc-type pitch motor in the second embodiment of this utility model; Figure 4 for Figure 3 Exploded view of a mid-disc pitch motor.

[0012] Explanation of reference numerals in the accompanying drawings of this utility model: Disc-type pitch motor 100, motor housing 1, connecting flange 11, through hole 12, mounting hole 13, receiving groove 14, annular mounting groove 15, radial rib 16, motor rotor 2, rotating shaft 21, first external spline 211, insertion hole 212, magnet 22, motor stator 3, stator winding 31, motor coil 311, stator core 312, brake 4, friction disc 41, first internal spline 411, second internal spline 412, brake disc 42, brake coil 43, protective cover 5, motor bearing 6.

[0013] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0016] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0017] This invention provides a disc-type pitch motor, which can be used in the pitch system of a wind turbine. Figures 1 to 4 This invention provides several embodiments of the disc-type pitch motor used in wind turbine units.

[0018] Please see Figures 1 to 4In some embodiments, the disc-type pitch motor 100 includes a motor housing 1, a motor rotor 2, a motor stator 3, and a brake 4. One end of the motor housing 1 is provided with a connecting flange 11 for connecting to a gearbox. The surface of the motor rotor 2 near the connecting flange 11 is provided with a rotating shaft 21 for driving connection with the input shaft of the gearbox, and a plurality of magnets 22 arranged along the rotation direction of the motor rotor 2 and surrounding the rotating shaft 21. The motor stator 3 is disposed on the motor housing 1 and includes a plurality of stator windings 31 arranged along the rotation direction of the motor rotor 2. The plurality of stator windings 31 and the plurality of magnets 22 are axially opposite to the rotating shaft 21. The brake 4 is disposed on the motor housing 1 and is used to brake the motor rotor 2.

[0019] Specifically, the wind turbine includes a pitch system, which comprises a disc pitch motor 100 and a gearbox (not shown in the figure) connected by a drive mechanism. The disc pitch motor 100 is an axially excited motor, such as a permanent magnet synchronous axially excited motor. For example, the pitch system may also include a frequency converter, which drives the disc pitch motor 100. Compared to existing pitch motors, the axially excited motor has a lower moment of inertia, therefore, at the same pitch angular acceleration, the disc pitch motor 100 requires a smaller frequency converter drive current, thus reducing the specifications and cost of the frequency converter. Simultaneously, compared to existing pitch motors, the axially excited motor is smaller and lighter, making the disc pitch motor 100 more compact and lighter, further reducing the cost of installation and field replacement.

[0020] A connecting flange 11 is provided on the outer peripheral side of one end of the motor housing 1 in the axial direction of the disc pitch motor 100. The connecting flange 11 can be fixed to the gearbox housing by means of bolts or other methods, thereby fixing it to the gearbox. Hereinafter, the axial direction of the disc pitch motor 100 is defined as the left-right direction, the end of the motor housing 1 with the connecting flange 11 is the left end of the motor housing 1, and the end of the motor housing 1 away from the connecting flange 11 is the right end of the motor housing 1.

[0021] The motor housing 1 is equipped with a motor rotor 2 and a motor stator 3. The motor rotor 2 can rotate relative to the motor housing 1 along a left-right upward axis. A rotating shaft 21 extending in the left-right direction is protruding on the left surface of the motor rotor 2. The left end of the rotating shaft 21 is connected to the input shaft of the gearbox. Thus, when the disc pitch motor 100 is energized, the motor rotor 2 can drive the input shaft of the gearbox to rotate together through the rotating shaft 21. The motor rotor 2 is equipped with multiple permanent magnets and other magnets 22 arranged along the rotation direction of the motor rotor 2.

[0022] The motor stator 3 is mounted on the motor housing 1. The motor stator 3 includes multiple stator windings 31 arranged along the rotation direction of the motor rotor 2, and the multiple stator windings 31 and multiple magnets 22 are spaced apart and opposite each other in the left and right directions. Each stator winding 31 typically includes a stator core 312 and a motor coil 311 wound on the stator core 312. Thus, when the motor coil 311 is energized, the motor stator 3 can drive the motor rotor 2 to rotate. The motor coil 311 and the stator core 312 form multiple stator windings 31 that are separate from each other. The multiple stator windings 31 can be positioned by epoxy resin casting and fixed in a common mold with the motor housing 1 to form an integrated stator housing assembly.

[0023] The specific number of motor stators 3 can be set according to the actual situation. For example, there can be only one motor stator 3, that is, the disc-type pitch motor 100 has a single stator structure. At this time, when the motor stator 3 is located on the left side of the motor rotor 2, multiple magnets 22 can be set on the left surface of the motor rotor 2; when the motor stator 3 is located on the right side of the motor rotor 2, multiple magnets 22 can be set on the right surface of the motor rotor 2.

[0024] For example, there can be two stators 3, that is, the disc-type pitch motor 100 has a double stator structure. The two stators 3 are spaced apart and facing each other from left to right, and the rotor 2 is located between the two stators 3. Multiple magnets 22 are arranged along the rotation direction of the rotor 2 on both the left and right surfaces.

[0025] The following will be an example of a motor stator 3 located on the left side of the motor rotor 2.

[0026] The brake 4 is mounted on the motor housing 1. The brake 4 can brake the motor rotor 2 to limit the rotation of the motor rotor 2. The brake 4 is mounted on the motor housing 1, meaning that the brake 4 and the motor stator 3 share the motor housing 1 as the housing. This allows the disc pitch motor 100 to be smaller and lighter. In addition, the motor housing 1 integrates the housing of the connecting flange 11 and the brake 4, which can reduce the number of mounting bolts for the brake 4.

[0027] The pitch system of the wind turbine of this utility model adopts an axially excited disc pitch motor 100. The disc pitch motor 100 has a small moment of inertia and light weight, and requires less variable frequency drive current under the same angular acceleration, which can reduce the specifications and cost of variable frequency drive. At the same time, the disc pitch motor 100 is compact and lightweight, which also reduces the cost of installation and on-site replacement of the disc pitch motor 100.

[0028] Optionally, please refer to Figures 1 to 4In some embodiments, the motor rotor 2 is located on the side of the motor housing 1 away from the connecting flange 11, and the motor stator 3 is disposed on the surface of the motor housing 1 near the motor rotor 2. The motor housing 1 is provided with a through hole 12 for the rotating shaft 21 to pass through.

[0029] Specifically, the motor rotor 2 is located on the right side of the motor housing 1, and multiple magnets 22 are disposed on the left surface of the motor rotor 2. A through hole 12 is provided through the middle of the motor housing 1, and the left end of the rotating shaft 21 passes through the motor housing 1 through the through hole 12 and is connected to the input shaft of the gearbox for transmission. The motor stator 3 is disposed on the right surface of the motor housing 1 corresponding to multiple magnets 22, and the motor stator 3 is arranged around the through hole 12.

[0030] Optionally, please refer to Figures 1 to 4 In some embodiments, a protective cover 5 is provided on the surface of the motor housing 1 near the motor rotor 2, and the protective cover 5 covers the motor rotor 2 and the magnet 22.

[0031] Specifically, the protective cover 5 can be fixed to the right surface of the motor housing 1 by means of screws or other means. The protective cover 5 and the right surface of the motor housing 1 form a receiving cavity. The right end of the motor rotor 2, magnet 22 and shaft 21 are located in the receiving cavity. In this way, the protective cover 5 can protect the inside of the disc pitch motor 100.

[0032] Optionally, please refer to Figure 1 and Figure 2 In some embodiments, a motor bearing 6 is provided between the inner wall of the perforation 12 and the rotating shaft 21.

[0033] Specifically, a motor bearing 6 or multiple motor bearings 6 arranged in the left-right direction can be provided between the rotating shaft 21 and the motor housing 1. In this way, the motor bearing 6 between the rotating shaft 21 and the motor housing 1 helps to ensure that the motor rotor 2 rotates smoothly.

[0034] The rotating shaft 21 is connected to the input shaft of the gearbox. The specific connection structure between the rotating shaft 21 and the input shaft of the gearbox can be set according to the actual situation. Optionally, please refer to [link to relevant documentation]. Figures 1 to 3 In some embodiments, a circumferential limiting structure is provided between the rotating shaft 21 and the input shaft of the gearbox for limiting the rotation direction of the motor rotor 2.

[0035] Specifically, the circumferential limiting structure can be a spline limiting structure or a threaded limiting structure, etc. The following will use a spline limiting structure as an example to illustrate this. For example, please refer to... Figure 1 and Figure 2In some embodiments, the circumferential limiting structure includes a first external spline 211 disposed on the rotating shaft 21 and an internal spline disposed on the input shaft of the gearbox, so that the rotating shaft 21 and the input shaft of the gearbox can transmit torque through the external and internal splines. For example, please refer to... Figure 3 and Figure 4 In some embodiments, the circumferential limiting structure includes an internal spline disposed on the rotating shaft 21 and a second external spline disposed on the input shaft of the gearbox, so that the rotating shaft 21 and the input shaft of the gearbox can also transmit torque through the external spline and the internal spline.

[0036] The brake 4 can brake the motor rotor 2. The specific style and location of the brake 4 on the motor housing 1 can be set according to the specific circumstances. For example, the brake 4 can be located on one side of the motor rotor 2 in the axial direction, that is, on the left or right side of the motor rotor 2. The brake 4 can be a disc brake, etc. Alternatively, the brake 4 can also be located on one side of the motor rotor 2 in the radial direction. The brake 4 can be a block-type radial brake or a caliper brake, etc.

[0037] Optionally, please refer to Figures 1 to 4 In some embodiments, the brake 4 includes a friction disc 41 and a brake disc 42. Both the friction disc 41 and the brake disc 42 are movably disposed on the side of the motor housing 1 near the gearbox along the axial direction of the shaft 21. The friction disc 41 is located on the side of the brake disc 42 near the gearbox.

[0038] Specifically, the left side of the motor housing 1 is provided with a friction disc 41 and a brake disc 42, which can move left and right relative to the rotating shaft 21. The brake disc 42 is located to the right of the friction disc 41, and a spring (not shown in the figure, the spring can be fixed in the spring hole on the motor housing 1) is usually provided between the brake disc 42 and the motor housing 1. A guide pin or guide sleeve or other movable guide structure can also be provided between the brake disc 42 and the motor housing 1 to guide the movement of the brake disc 42. When the brake 4 is de-energized, the spring pushes the brake disc 42 to the left, so that the friction disc 41 is pushed against the flange plane of the gearbox through the brake disc 42. In this way, the friction disc 41, the flange plane of the gearbox, and the brake disc 42 form two friction pairs, thereby restricting the rotation of the motor rotor 2. When the brake 4 is energized, the brake disc 42 moves to the right and compresses the spring, so that the brake 4 can convert electrical energy into the elastic potential energy of the spring. At this time, the friction disc 41 disengages from the flange plane of the gearbox and the brake disc 42, so that the motor rotor 2 can rotate normally. The flange plane of the gearbox serves as a friction pair for a brake 4, which can save on the existing brake mounting plate and fixing screws.

[0039] Optionally, please refer to Figures 1 to 4In some embodiments, a receiving groove 14 is provided on the surface of the motor housing 1 near the gearbox, and at least a portion of the friction disc 41 and the brake disc 42 are disposed in the receiving groove 14.

[0040] Specifically, a receiving groove 14 is provided on the left surface of the motor housing 1, and a through hole 12 is provided in the middle of the bottom wall of the receiving groove 14. The right end of the friction disc 41 and the brake disc 42 are disposed in the receiving groove 14. By placing the brake 4 in the receiving groove 14 of the motor housing 1, the disc pitch motor 100 can be made compact and lightweight. The following will be described using the brake 4 disposed in the receiving groove 14 of the motor housing 1 as an example.

[0041] Optionally, please refer to Figure 1 and Figure 2 In some embodiments, the brake 4 further includes a brake coil 43, which is disposed on the surface of the motor housing 1 near the gearbox, so that when the brake coil 43 is energized, the brake disc 42 is driven to move in a direction away from the gearbox.

[0042] Specifically, the brake coil 43 is arranged in a ring shape and is located on the bottom wall of the receiving groove 14. The brake coil 43 is located to the right of the brake disc 42 and is opposite to the brake disc 42. When the brake coil 43 is de-energized, the spring pushes the brake disc 42 to the left, thereby pushing the friction disc 41 towards the flange plane of the gearbox. In this way, the friction disc 41, the flange plane of the gearbox, and the brake disc 42 form two friction pairs, thereby restricting the rotation of the motor rotor 2. When the brake coil 43 is energized, the brake disc 42 (usually made of iron, etc.) and the brake coil 43 form a closed magnetic circuit. The brake coil 43 attracts the brake disc 42 closer to the brake coil 43, causing the friction disc 41 to disengage from the flange plane of the gearbox and the brake disc 42, thereby releasing the motor rotor 2. Compared with existing pitch motors, the moment of inertia of this disc-type pitch motor 100 can be reduced by about 30% to 50%, the volume can be reduced by about 60%, and the weight can be reduced by about 25% to 35%.

[0043] Further, please refer to Figure 1 and Figure 2 In some embodiments, an annular mounting groove 15 is provided on the surface of the motor housing 1 near the gearbox, and the brake coil 43 is disposed in the annular mounting groove 15.

[0044] Specifically, an annular mounting groove 15 is provided on the bottom wall of the receiving groove 14, and the brake coil 43 is embedded in the annular mounting groove 15. In this way, by providing an annular mounting groove 15 on the motor housing 1 to accommodate the brake coil 43, the brake coil 43 can be installed and positioned on the motor housing 1.

[0045] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, a plurality of mounting holes 13 are provided through the surface of the motor housing 1 near the gearbox, and a plurality of stator windings 31 are respectively provided at the plurality of mounting holes 13, so that when the motor coil 311 of the stator windings 31 is energized, the brake disc 42 is driven to move away from the gearbox through the motor coil 311.

[0046] Specifically, multiple mounting holes 13 are provided through the bottom wall of the receiving slot 14, and multiple stator windings 31 are respectively embedded in the multiple mounting holes 13. The disc-type pitch motor 100 uses the motor coil 311 as the brake coil and adopts a bearingless design. In this way, not only can the stator winding 31, composed of the motor coil 311 and the stator core 312, form an axial magnetic circuit with the magnet 22 fixed on the motor rotor 2, converting electrical energy into the mechanical energy of motor rotation; and when the motor coil 311 is energized, the stator winding 31, composed of the motor coil 311 and the stator core 312, can also form a closed magnetic circuit with the brake disc 42. The stator winding 31 attracts the brake disc 42 close to the stator winding 31, causing the friction disc 41 to disengage from the flange plane of the gearbox and the brake disc 42, thereby releasing the motor rotor 2. Compared to existing pitch motors, the moment of inertia of this disc pitch motor 100 can be reduced by about 35% to 50%. Furthermore, since the disc pitch motor 100 eliminates the shaft, bearings, retaining rings, pressure plates, positioning sleeves, aluminum alloy housings, rear end covers, and various connecting screws of existing pitch motors, as well as the spline sleeves, housings, coils, end plates, coils, keys, and other parts of the brake, the weight of this disc pitch motor 100 can be reduced by about 45% to 55%.

[0047] The stator winding 31 can adopt a structure of flat copper wire + independent iron core, that is, the motor coil 311 is flat copper wire, so that the stator winding 31 has no coil end face, which can save about 30% of the motor copper and iron, and 100% of the brake copper wire.

[0048] Optionally, please refer to Figure 1 and Figure 2 In some embodiments, the friction disk 41 is sleeved on the rotating shaft 21, and a first limiting structure for limiting the rotation direction of the motor rotor 2 is provided between the friction disk 41 and the rotating shaft 21.

[0049] Specifically, the first limiting structure can be a spline limiting structure or a threaded limiting structure, etc. The following description will use a spline limiting structure as an example. The first limiting structure includes a first external spline 211 disposed on the rotating shaft 21 and a first internal spline 411 disposed on the friction disk 41. Through the cooperation between the first internal spline 411 and the first external spline 211, the friction disk 41 and the rotating shaft 21 can not only achieve limiting of the friction disk 41 and the rotating shaft 21 in the rotation direction of the motor rotor 2, but also guide the movement of the friction disk 41 in the left and right upward directions.

[0050] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the rotating shaft 21 is located on the side of the friction disc 41 near the brake disc 42. The friction disc 41 is sleeved on the input shaft of the gearbox. A second limiting structure for limiting the rotation direction of the motor rotor 2 is provided between the friction disc 41 and the input shaft of the gearbox.

[0051] Specifically, the friction disc 41 is located on the left side of the rotating shaft 21, and the friction disc 41 is mounted on the input shaft of the gearbox via a second limiting structure. The second limiting structure can be a spline limiting structure or a threaded limiting structure, etc. The following description uses a spline limiting structure as an example. The second limiting structure includes a second external spline on the input shaft of the gearbox and a second internal spline 412 on the friction disc 41. Through the cooperation between the second internal spline 412 and the second external spline, the friction disc 41 and the input shaft of the gearbox can not only limit the movement of the friction disc 41 and the input shaft of the gearbox in the rotational direction of the motor rotor 2, but also guide the movement of the friction disc 41 in the left and right upward directions.

[0052] Further, please refer to Figure 3 and Figure 4 In some embodiments, the end face of the rotating shaft 21 away from the motor rotor 2 is provided with a plug hole 212 for the input shaft of the gearbox to be plugged in.

[0053] Specifically, a insertion hole 212 is provided through the left end face of the rotating shaft 21. One end of the input shaft of the gearbox passes through the friction disk 41 and is inserted into the insertion hole 212. In this way, the input shaft of the gearbox can be used to center and axially position the friction disk 41 and the motor rotor 2.

[0054] The motor housing 1 is typically equipped with cooling structures such as radial ribs or a liquid cooling system to dissipate heat from the motor coil 311 (or simultaneously from both the motor coil 311 and the brake coil 43). Alternatively, please refer to... Figures 1 to 4 In some embodiments, radial ribs 16 are provided on the outer peripheral side of the motor housing 1.

[0055] Specifically, radial ribs 16 are provided on the motor housing 1 so that the disc pitch motor 100 can be cooled by air through the radial ribs 16 on the motor housing 1.

[0056] This utility model also provides a wind turbine unit, which includes a disc-type variable pitch motor. Since the disc-type variable pitch motor adopts the technical solution of the above embodiment, it has the beneficial effects brought about by the technical solution of the above embodiment.

[0057] Optionally, in some embodiments, the wind turbine unit further includes a gearbox, with the disc pitch motor 100 mounted on the gearbox via a connecting flange 11, and the shaft 21 of the disc pitch motor 100 being drively connected to the input shaft of the gearbox. The wind turbine unit includes a variable diameter system, which includes the disc pitch motor 100 and the gearbox.

[0058] Optionally, in some embodiments, the wind turbine also includes an inverter electrically connected to the disc pitch motor 100. The variable diameter system also includes an inverter electrically connected to the disc pitch motor 100, which can drive the disc pitch motor 100.

[0059] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A disc-type pitch motor, characterized in that, include: The motor housing has a connecting flange at one end for connecting to the gearbox; The motor rotor has a rotating shaft for driving connection with the input shaft of the gearbox on its surface near the connecting flange, and a plurality of magnets arranged along the rotation direction of the motor rotor and surrounding the rotating shaft. The motor stator is disposed on the motor housing and includes a plurality of stator windings arranged along the rotation direction of the motor rotor, wherein the plurality of stator windings and a plurality of magnets are axially opposite to the rotating shaft. A brake is mounted on the motor housing and is used to brake the motor rotor.

2. The disc-type pitch motor according to claim 1, characterized in that, The motor rotor is located on the side of the motor housing away from the connecting flange, and the motor stator is disposed on the surface of the motor housing close to the motor rotor. The motor housing is provided with a through hole for the rotating shaft to pass through.

3. The disc-type pitch motor according to claim 2, characterized in that, A protective cover is provided on the surface of the motor housing near the motor rotor, and the protective cover covers the motor rotor and the magnet; and / or, A motor bearing is provided between the inner wall of the perforation and the rotating shaft.

4. The disc-type pitch motor according to claim 1, characterized in that, The brake includes a friction disc and a brake disc, both of which are movably disposed on the side of the motor housing near the gearbox along the axial direction of the rotating shaft, with the friction disc located on the side of the brake disc near the gearbox.

5. The disc-type pitch motor according to claim 4, characterized in that, The brake also includes a brake coil disposed on the surface of the motor housing near the gearbox, so as to drive the brake disc to move away from the gearbox when the brake coil is energized; or, The motor housing has multiple mounting holes extending through the surface near the gearbox. Multiple stator windings are respectively disposed at the multiple mounting holes so that when the motor coil of the stator winding is energized, the brake disc is driven to move away from the gearbox through the motor coil.

6. The disc-type pitch motor according to claim 4, characterized in that, The motor housing has a receiving groove on its surface near the gearbox, and at least a portion of the friction disc and the brake disc are disposed within the receiving groove.

7. The disc-type pitch motor according to claim 4, characterized in that, The friction disc is sleeved on the rotating shaft, and a first limiting structure is provided between the friction disc and the rotating shaft for limiting the rotation direction of the motor rotor.

8. The disc-type pitch motor according to claim 4, characterized in that, The rotating shaft is located on the side of the friction disc near the brake disc. The friction disc is sleeved on the input shaft of the gearbox. A second limiting structure for limiting the rotation direction of the motor rotor is provided between the friction disc and the input shaft of the gearbox.

9. The disc-type pitch motor according to claim 8, characterized in that, The end face of the rotating shaft away from the motor rotor is provided with a plug-in hole for the input shaft of the gearbox to be inserted and mated.

10. A wind turbine unit, characterized in that, include: Gearbox; A disc-type pitch motor, wherein the disc-type pitch motor is as described in any one of claims 1-9, the disc-type pitch motor is mounted on the gearbox via a connecting flange, and the rotating shaft of the disc-type pitch motor is drively connected to the input shaft of the gearbox.

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