Permanent magnet wind power motor

Abstract

The permanent magnet wind power motor comprises a rotating shaft, a hub flange, a front end cover, a rotor support and a rear end cover are sequentially arranged on the rotating shaft from the front end to the rear end, the rotor support is sleeved with a stator, the front end of the stator is fixedly matched with the front end cover, the rear end of the stator is fixedly matched with the rear end cover, and the outer side face of the rear end cover is further fixedly matched with a tower. A front bearing is arranged between the front end cover and the rotating shaft, and a rear bearing is arranged between the rear end cover and the rotating shaft; the motor is of an outer stator and inner rotor structure, the main shaft and the motor rotating shaft are integrally designed into an integrated structure, the tower and the motor rear end cover are integrated together, the rotor support and the magnetic pole are integrated together, parts such as the main shaft, a gearbox, a coupler and a sliding ring are omitted, in the motor operation process, the unit transmission system path is short, and the rotor magnetic pole is not prone to falling off; and the unit fault probability is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a permanent magnet wind motor. Background Art

[0002] Distributed power generation system is one of the important ways to solve the energy crisis. Faced with increasingly fierce market competition and cost pressure, it is necessary to continuously optimize the design of the power generation system structure to achieve the goal of reducing costs and increasing efficiency to meet market demand. The existing wind power generation system transmits torque from the blades to the main shaft, increases the speed through the gearbox, and then transmits it to the generator through the coupling to achieve power generation. The unit transmission chain path is too long, there are many parts, the unit failure rate is high, and the transmission chain transmits large torque, the number of connecting bolts is large, the specifications are large, the bolt life is short, and it is easy to break and fail; in addition, the existing wind power generation system usually has a high speed, and the rotor is fixed with pole bolts. There is a problem of pole shedding during operation, which may cause the generator pole shedding failure. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a permanent magnet wind turbine with fewer parts, rotor poles that are not easy to fall off, low unit failure rate, and effectively shortening the axial length of the transmission chain system to achieve a compact design of the transmission chain structure.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention proposes a permanent magnet wind turbine, comprising a rotating shaft, on which a hub flange, a front end cover, a rotor bracket and a rear end cover are arranged in sequence from the front end to the rear end, a stator is sleeved on the outside of the rotor bracket, the front end of the stator is fixedly matched with the front end cover, the rear end is fixedly matched with the rear end cover, the outer side of the rear end cover is also fixedly matched with the tower, a front bearing is arranged between the front end cover and the rotating shaft, and a rear bearing is arranged between the rear end cover and the rotating shaft.

[0006] Furthermore, the rotor bracket includes a bracket body, the outer surface of which is provided with a circle of surface-mounted magnets, each pole magnet is arranged along the axial direction of the motor, each pole magnet is buckled with a pole box on the upper end, and a slot wedge is filled between two adjacent pole boxes.

[0007] Furthermore, pole pressure plates are respectively provided at both ends of each pole of the magnetic steel, and the pole pressure plates are fixedly connected to the end faces of the magnetic yokes of the bracket body.

[0008] Furthermore, annular ribs and radial ribs are provided on the outer sides of the front cover and the rear cover.

[0009] Furthermore, threaded holes are provided on the inner circles of the front cover and the rear cover, and temperature measuring sensors are embedded in the threaded holes.

[0010] Furthermore, a support base and a safety handrail are respectively provided on the outside of the stator base. The support base is arranged at the bottom of the base, and the safety handrail is arranged at the upper end of the base. Lifting holes are also provided on both sides of the base.

[0011] Furthermore, the inner rings of the front cover and the rear cover are both inner flange structures, and tolerance fit is adopted between the front cover and the front bearing, between the rear cover and the rear bearing, between the front bearing and the rotating shaft, between the rear bearing and the rotating shaft, between the hub flange and the rotating shaft, and between the rotor and the rotating shaft.

[0012] Furthermore, the rotating shaft is hollow, and a transition position of the rotating shaft diameter is an arc transition.

[0013] Furthermore, the angle between the matching surface of the rear end cover and the tower and the vertical direction is 5-10°.

[0014] Furthermore, the rear end cover is connected to the tower through a stopper.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The motor of the present invention has an outer stator and inner rotor structure, and the main shaft and the motor shaft are integrated into an integrated structure. The tower is integrated with the rear end cover of the motor, and the rotor bracket is integrated with the magnetic pole. The main shaft, gear box, coupling, slip ring and other components are eliminated. During the operation of the motor, the unit transmission system path is short, the rotor magnetic pole is not easy to fall off, and the probability of unit failure is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the motor of the present invention;

[0018] Figure 2 It is a cross-sectional view of the motor of the present invention;

[0019] Figure 3 for Figure 2 Sectional view at AA;

[0020] Figure 4 for Figure 2 Sectional view at the middle BB;

[0021] Figure 5 is a schematic diagram of the stator structure;

[0022] Figure 6 is a schematic diagram of the rotor support structure;

[0023] Figure 7 It is an assembly drawing of the pole box and the slot wedge on the bracket body;

[0024] Figure 8 for Figure 7 Sectional view at cc;

[0025] Fig. 9 The figure is a schematic diagram of the assembly of the rear end cover and the tower;

[0026] Figure numerals: 1. rotating shaft, 2. hub flange, 3. front end cover, 4. stator, 401. support base, 402. safety handrail, 403 lifting hole, 5. rear end cover, 6. front bearing, 7. rear bearing, 8. rotor bracket, 801. bracket body, 802. magnet, 803. pole box, 804. slot wedge, 805. pole pressure plate 9. tower, 10. temperature sensor. DETAILED DESCRIPTION

[0027] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] refer to Figures 1 to 4 The present embodiment provides a permanent magnet wind turbine, comprising a rotating shaft 1, on which a hub flange 2, a front end cover 3, a rotor bracket 8, and a rear end cover 5 are arranged in sequence from the front end to the rear end. A stator 4 is sleeved on the outside of the rotor bracket 8. The front end of the stator 4 is fixedly matched with the front end cover 3, and the rear end is fixedly matched with the rear end cover 5. A front bearing 6 is arranged between the front end cover 3 and the rotating shaft 1, and a rear bearing 7 is arranged between the rear end cover 5 and the rotating shaft 1. The outer side surface of the rear end cover 5 is also fixedly matched with a tower 9, and the lower end of the tower 9 is connected to the tower.

[0031] The motor of this embodiment has an outer stator and inner rotor structure. The motor main shaft and the rotating shaft 1 are integrated into an integrated structure, and the tower 9 is integrated with the rear end cover 5 of the motor, eliminating the main shaft, gear box, coupling, slip ring and other components. During the operation of the motor, the unit transmission system path is short and the unit failure rate is greatly reduced. This embodiment also integrates the rotor bracket 8 and the magnetic pole. During the operation of the motor, the rotor bracket 8 will not fall off due to the high-speed rotation of the rotor 8.

[0032] Further, refer to Figures 6 to 8The rotor bracket 8 includes a bracket body 801, and the outer surface of the bracket body 801 is provided with surface-mounted magnets 802 at intervals. Each pole magnet 802 is arranged along the axial direction of the motor. A pole box 803 is buckled on the upper end of each pole magnet 802, and the lower end of the pole box 803 is fixedly connected to the bracket body 801, so that the magnet 802 can be fixed to prevent the magnet 802 from falling off. A slot wedge 804 is filled between two adjacent pole boxes 803, and the pole boxes 803 on both sides can be pressed tightly. The slot wedge 804 can be connected to the bracket body 801 by countersunk bolts for reinforcement. In order to prevent the magnet 802 from being exposed from the end of the pole box 803, a pole pressure plate 805 can be respectively provided at both ends of each pole magnet 802, and the pole pressure plate 805 is fixedly connected to the yoke end face of the bracket body 801, so that the pole will not move along the axial direction of the motor, withstand a large centrifugal force, and there is no risk of falling off and sweeping.

[0033] Furthermore, the front end cover 3 and the rear end cover 5 are integrally welded steel plates, and annular ribs and radial ribs are provided on the outer sides of the front end cover 3 and the rear end cover 5 to ensure that the front and rear end covers 5 improve the rigidity of the entire system while bearing the operating load.

[0034] Further, refer to Figure 3 and Figure 4 In order to realize online monitoring of the bearing temperature, threaded holes are provided on the inner rings of the front cover 3 and the rear cover 5, and temperature sensors 10 are embedded in the threaded holes. The sensor on the front cover 3 tests the temperature of the front bearing 6, and the sensor on the rear cover 5 tests the temperature of the rear bearing 7.

[0035] Further, refer to Figure 1 and Figure 5 The outside of the base of the stator 4 is respectively provided with a support base 401 and a safety handrail 402. The support base 401 is arranged at the bottom of the base and is used to support and fix the motor during type testing. The safety handrail 402 is arranged at the upper end of the base. After the whole machine is assembled, the outer surface of the base is exposed to the atmosphere. During maintenance, maintenance personnel need to climb outside the cabin. The safety handrail 402 can effectively ensure safe operation. Preferably, lifting holes 403 are also provided at the 3 o'clock and 9 o'clock positions of the base for base assembly and motor lifting and turning over. Observation holes for observing the rotor can also be provided on the front cover 3 and the rear cover 5 to facilitate regular maintenance while meeting the lightweight design without affecting the strength.

[0036] Further, refer to Figure 2The inner rings of the front end cover 3 and the rear end cover 5 are both inner flange structures. The front end cover 3 and the front bearing 6, the rear end cover 5 and the rear bearing 7, the front bearing 6 and the rotating shaft 1, the rear bearing 7 and the rotating shaft 1, the hub flange 2 and the rotating shaft 1, and the rotor and the rotating shaft 1 are all calculated through engineering, and reasonable dimensional tolerances are selected. Large torque can be transmitted in the matching position, the structure is simple, and the connection is reliable.

[0037] Furthermore, in order to facilitate the arrangement of the cables and signal lines of the variable pitch motor on the front hub side, the rotating shaft 1 is hollow, and the diameter transition position of the rotating shaft 1 is an arc transition to prevent stress concentration from damaging the unit, provide threading space for the generator hub wiring harness, thread the wiring harness to the rear end, and achieve weight reduction at the same time.

[0038] Further, refer to Fig. 9 The included angle between the mating surface of the rear end cover 5 and the tower 9 and the vertical direction is 5-10°, and the preferred angle in this embodiment is 6°, which can solve the problem of the windward inclination angle of the integrated unit blades.

[0039] In the above embodiments, preferably, the rear end cover 5 is connected to the tower 9 through a stopper, the stator base is connected to the front end cover 3 and the rear end cover 5 respectively through bolts, and the rear end cover 5 is also connected to the tower 9 through bolts.

[0040] Although the present invention has been described in detail in this specification by means of general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto on the basis of the present invention. Therefore, these modifications or improvements made without departing from the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A permanent magnet wind turbine, characterized in that: The invention comprises a rotating shaft (1), on which a hub flange (2), a front end cover (3), a rotor bracket (8), and a rear end cover (5) are arranged in sequence from the front end to the rear end. A stator (4) is sleeved on the outside of the rotor bracket (8). The front end of the stator (4) is fixedly matched with the front end cover (3), and the rear end is fixedly matched with the rear end cover (5). The outer side of the rear end cover (5) is also fixedly matched with a tower (9). A front bearing (6) is arranged between the front end cover (3) and the rotating shaft (1), and a rear bearing (7) is arranged between the rear end cover (5) and the rotating shaft (1).

2. A permanent magnet wind power motor according to claim 1, characterized in that: The rotor support (8) comprises a support body (801), the outer surface of the support body (801) is provided with a circle of surface-mounted magnetic steel (802), each pole magnetic steel (802) is arranged along the axial direction of the motor, a magnetic pole box (803) is buckled at the upper end of each pole magnetic steel (802), and a slot wedge (804) is filled between two adjacent magnetic pole boxes (803).

3. A permanent magnet wind power motor according to claim 2, characterized in that: Magnetic pole pressure plates (805) are respectively provided at both ends of each pole magnetic steel (802), and the magnetic pole pressure plates (805) are fixedly connected to the yoke end surface of the bracket body (801).

4. A permanent magnet wind power generator according to claim 1, characterized in that: Annular ribs and radial ribs are provided on the outer sides of the front end cover (3) and the rear end cover (5).

5. A permanent magnet wind power generator according to claim 1, characterized in that: The front end cover (3) and the rear end cover (5) are both provided with threaded holes on their inner circles, and temperature measuring sensors (10) are embedded in the threaded holes.

6. A permanent magnet wind power generator according to claim 1, characterized in that: The stator (4) is provided with a support base (401) and a safety handrail (402) on the outside of the base. The support base (401) is arranged at the bottom of the base, and the safety handrail (402) is arranged at the upper end of the base. Lifting holes (403) are also provided on both sides of the base.

7. A permanent magnet wind power generator according to claim 1, characterized in that: The inner rings of the front end cover (3) and the rear end cover (5) are both inner flange structures, and tolerance fit is achieved between the front end cover (3) and the front bearing (6), between the rear end cover (5) and the rear bearing (7), between the front bearing (6) and the rotating shaft (1), between the rear bearing (7) and the rotating shaft (1), between the hub flange (2) and the rotating shaft (1), and between the rotor and the rotating shaft (1).

8. A permanent magnet wind power generator according to claim 1, characterized in that: The rotating shaft (1) is hollow, and the diameter transition position of the rotating shaft (1) is an arc transition.

9. A permanent magnet wind power generator according to claim 1, characterized in that: The included angle between the matching surfaces of the rear end cover (5) and the tower (9) and the vertical direction is 5 to 10 degrees.

10. A permanent magnet wind power generator according to claim 1, characterized in that: The rear end cover (5) is connected to the tower frame (9) through a stopper.

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