Permanent magnet semi-direct-driven wind driven generator with low cost and high reliability

Abstract

The utility model belongs to the technical field of wind power engines, and particularly relates to a permanent magnet semi-direct-driven wind power generator which is low in cost and high in reliability. The utility model has the advantages of low cost, high reliability, small occupied space and the like; the stator and rotor pole slots of the motor are matched and optimized, so that the number of permanent magnets is reduced, and the overall cost of the motor is reduced; the Z-shaped slip ring brush holder supporting frame is designed and is rooted on the rear end cover, so that the slip ring brush holder is firmly fixed; the protective cover plate is additionally arranged on the rear end cover of the motor to protect all rotating parts, so that the safety and reliability of the motor in the running process are ensured; the installation interface of the auxiliary junction box is designed to a proper position, so that the length of an outgoing line is saved, and the problem of spatial layout of the auxiliary junction box is solved; by adjusting the mounting position of the brake, the deviation angle of the brake is adjusted to a proper position, hydraulic oil of the motor brake is prevented from directly flowing onto a brake disc to cause friction fire, and the running reliability of the motor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power engines, relates to a wind generator, and specifically relates to a low-cost, high-reliability permanent magnet semi-direct-drive wind generator. Background Art

[0002] The industry knows that compared with other new energy sources, onshore wind power has comprehensive advantages in terms of technical maturity, economy, and development potential. In the future, high-power permanent magnet semi-direct drive wind turbines are expected to be widely used in large-scale onshore wind power projects based on their advantages in cost and reliability. However, as the power of wind turbines continues to increase, permanent magnet semi-direct drive wind turbines will develop in the direction of low cost, high reliability, and small space occupation in the future.

[0003] However, in the process of realizing the above development, the existing permanent magnet semi-direct drive wind turbines still have the following technical difficulties: 1) The brakes are currently arranged at the 12 o'clock and 6 o'clock positions of the motor connection end, which are prone to oil leakage during operation and are very likely to cause fire due to friction with the brake disc, leading to fire accidents in the unit; 2) The motor slip ring brush holder is connected to the gear box threading tube in the motor cavity, and the slip ring brush holder support needs to be arranged at the connection end; 3) During the operation of the motor, all rotating parts at the connection end are on the outside of the rear end cover, which is more difficult to protect; 4) The auxiliary junction box needs to take into account the user interface and the internal wiring of the motor, and it is difficult to arrange and install it on the motor; 5) The cost of permanent magnets, a key material of permanent magnet semi-direct drive wind turbines, remains high, and the overall cost of the motor needs to be reduced.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a low-cost, high-reliability permanent magnet semi-direct-drive wind turbine.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A low-cost, high-reliability permanent magnet semi-direct drive wind turbine generator, comprising a base, a rotor installed in the base, a stator, and a front cover and a rear cover fixedly installed on both sides of the base;

[0008] One end of the rotor shaft of the rotor is rotatably fixed to the front end cover, and the other end is fixedly connected to a brake disc with a hollow disc structure exposed outside the rear end cover, and the rotor shaft exposed in the hollow disc structure of the brake disc is provided with a slip ring connected to a slip ring brush holder;

[0009] The rear end cover is provided with a Z-shaped slip ring brush holder support frame which bypasses the brake disc and is fixedly connected to the slip ring brush holder; the rear end cover is also fixed with a protective cover plate which is adapted to the rear end cover structure.

[0010] Specifically, two brakes for braking the brake disc and symmetrically about the rotor axis of rotation are installed on the rear end cover; a line connecting the positions of the two brakes forms an angle α with the vertical center line of the brake disc.

[0011] Specifically, the angle α is in the range of 15°≤α≤30°.

[0012] Specifically, one end of the Z-shaped slip ring brush holder support frame is fixedly connected to the rear end cover, and the other end is fixedly connected to the slip ring brush holder through bolts.

[0013] Specifically, the protective cover plate includes an upper cover plate and a lower cover plate symmetrically arranged on the upper cover plate, and the upper cover plate and the lower cover plate are respectively fixedly connected to the rear end cover.

[0014] Specifically, the protective cover plate is also provided with a plurality of heat dissipation holes.

[0015] Specifically, a through hole is provided at the center of the protective cover plate for conveniently checking the operation status of the rotor.

[0016] Specifically, an auxiliary junction box for connecting incoming and outgoing lines is also provided around the base.

[0017] Specifically, the number of pole slots of the rotor is 12.

[0018] Compared with the prior art, the technical solution provided by the utility model includes the following beneficial effects:

[0019] The utility model has the advantages of low cost, high reliability and small space occupation; 1) by designing a Z-shaped slip ring brush holder support frame, rooted to the rear end cover, the slip ring brush holder is ensured to be firmly fixed, thereby improving the reliability of motor operation; 2) by adjusting the brake installation position, taking the vertical center line on the rear end cover as the reference, the brake offset angle is adjusted to an appropriate position (15°≤α≤30°), thereby preventing the motor brake hydraulic oil from directly flowing onto the brake disc, causing friction and fire, thereby improving the reliability of motor operation; 3) by adding a protective cover plate to the rear end cover of the motor, which is divided into an upper cover plate and a lower cover plate, all rotating parts are protected to ensure safety and reliability during motor operation; 4) by designing the auxiliary junction box installation interface to the outer surface of the base in the circumferential direction, the length of the outlet line is saved, and the problem of spatial layout of the auxiliary junction box is also solved; 5) by optimizing the matching of the stator and rotor pole slots of the motor, the radial distance of the motor is shortened, the amount of permanent magnets is reduced, and the overall cost of the motor is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated into and constitute a part of this specification, and together with the description, are used to explain the principles of the present utility model.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 A three-dimensional diagram of the permanent magnet semi-direct drive wind turbine generator of the utility model;

[0023] Figure 2 It is a schematic diagram of the rear end cover of the permanent magnet semi-direct drive wind turbine generator of the utility model;

[0024] Figure 3 It is a schematic diagram of a protective cover plate of a permanent magnet semi-direct drive wind turbine generator of the utility model;

[0025] Figure 4 It is a schematic diagram of the rotor of the permanent magnet semi-direct drive wind turbine generator of the present invention.

[0026] Among them: 1 is the base; 2 is the rear end cover; 3 is the auxiliary junction box; 4 is the Z-type slip ring brush holder support frame; 5 is the slip ring brush holder; 6 is the brake; 7 is the brake disc; 8 is the protective cover; 81 is the upper cover; 82 is the lower cover; 9 is the rotor. DETAILED DESCRIPTION

[0027] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present utility model. Instead, they are only examples consistent with some aspects of the present utility model as detailed in the attached claims.

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Example 1

[0030] This embodiment provides a low-cost, high-reliability permanent magnet semi-direct drive wind turbine generator, comprising a base 1, a rotor 9 installed in the base 1, a stator, and a front cover and a rear cover 2 fixedly installed on both sides of the base 1;

[0031] One end of the rotor shaft of the rotor 9 is rotatably fixed to the front end cover, and the other end is fixedly connected to a brake disc 7 with a hollow disc structure exposed outside the rear end cover 2, and the rotor shaft exposed in the hollow disc structure of the brake disc 7 is provided with a slip ring connected to the slip ring brush holder 5;

[0032] The rear end cover 2 is provided with a Z-shaped slip ring brush holder support frame 4 that bypasses the brake disc 7 and is fixedly connected to the slip ring brush holder 5; the rear end cover 2 is also fixed with a protective cover plate 8 that is compatible with the structure of the rear end cover 2, and the protective cover plate 8 is used to protect the transmission components of the rear end cover 2, see Figure 1-3 shown.

[0033] Specifically, the rear end cover 2 is equipped with two brakes 6 for braking the brake disc 7 and symmetrically about the rotor axis; the connecting line of the two brakes 6 forms an angle α with the vertical center line of the brake disc 7 to prevent the brake hydraulic oil from flowing directly onto the brake disc 7 and causing friction fire, see Figure 2 shown.

[0034] Specifically, the angle α is in the range of 15°≤α≤30°.

[0035] Specifically, one end of the Z-shaped slip ring brush holder support frame 4 is fixedly connected to the rear end cover 2, and the other end is fixedly connected to the slip ring brush holder 5 by bolts, see Figure 2 shown.

[0036] Specifically, the protective cover plate 8 includes an upper cover plate 81 and a lower cover plate 82 symmetrically arranged on the upper cover plate 81, and the upper cover plate 81 and the lower cover plate 82 are respectively connected to the rear end cover 2 by screws, see Figure 3 shown.

[0037] Specifically, the protective cover plate 8 is also provided with a plurality of heat dissipation holes, see Figure 3 shown.

[0038] Specifically, a through hole is provided at the center of the protective cover plate 8 for conveniently checking the operation of the rotor 9, see Figure 3 shown.

[0039] Specifically, the base 1 is also provided with an auxiliary junction box 3 for connecting the incoming and outgoing lines. The junction box 3 is connected to the base 1 by screws. Figure 1 shown.

[0040] Specifically, the number of pole slots of the rotor 9 is 12, which reduces the amount of permanent magnets (from 24 poles to 12 poles, and the diameter is reduced), see Figure 4 shown.

[0041] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0042] It should be understood that the present invention is not limited to the above-described contents, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A low-cost, high-reliability permanent magnet semi-direct drive wind turbine generator, characterized in that: It comprises a machine base (1), a rotor (9) installed in the machine base (1), a stator, and a front end cover and a rear end cover (2) fixedly installed on both sides of the machine base (1); One end of the rotor shaft of the rotor (9) is rotatably fixed to the front end cover, and the other end is fixedly connected to a brake disc (7) exposed outside the rear end cover (2) and having a hollow disc structure, and the rotor shaft exposed in the hollow disc structure of the brake disc (7) is provided with a slip ring connected to a slip ring brush holder (5); The rear end cover (2) is provided with a Z-shaped slip ring brush holder support frame (4) that bypasses the brake disc (7) and is fixedly connected to the slip ring brush holder (5); the rear end cover (2) is also fixed with a protective cover plate (8) that is compatible with the structure of the rear end cover (2).

2. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: The rear end cover (2) is provided with two brakes (6) for braking the brake disc (7) and symmetrically arranged about the rotor axis of rotation; a line connecting the positions of the two brakes (6) forms an angle α with the vertical center line of the brake disc (7).

3. The permanent magnet semi-direct drive wind turbine generator according to claim 2, characterized in that: The angle α is in the range of 15°≤α≤30°.

4. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: One end of the Z-shaped slip ring brush holder support frame (4) is fixedly connected to the rear end cover (2), and the other end is fixedly connected to the slip ring brush holder (5) via bolts.

5. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: The protective cover plate (8) comprises an upper cover plate (81) and a lower cover plate (82) symmetrically arranged with respect to the upper cover plate (81); the upper cover plate (81) and the lower cover plate (82) are respectively fixedly connected to the rear end cover (2).

6. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: The protective cover plate (8) is also provided with a plurality of heat dissipation holes.

7. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: A through hole is provided at the center of the protective cover plate (8) for conveniently checking the running condition of the rotor (9).

8. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: An auxiliary junction box (3) for connecting incoming and outgoing lines is also provided around the base (1).

9. The permanent magnet semi-direct drive wind turbine generator according to claim 1, characterized in that: The number of pole slots of the rotor (9) is 12.

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