CN203734486U - High-temperature superconductive permanent-magnetic aerogenerator with double-stator structure - Google Patents

Abstract

The utility model discloses a high temperature superconducting permanent magnet wind power generator with a double stator structure. In the casing, the rotor is a hollow cup-shaped rotor, the bottom of the rotor is fixedly connected with the rotating shaft, permanent magnets are evenly distributed on the inner and outer walls of the rotor along the circumference; the inner and outer circumferences of the rotor are respectively equipped with inner and outer stators. There are air gaps between the outer stator and the permanent magnets on the inner and outer walls of the rotor; outer stator slots are evenly distributed on the inner side of the outer stator along the circumferential direction, and the first superconducting armature windings are wound on two adjacent outer stator slots; The outer side of the inner stator is evenly distributed with inner stator slots along the circumferential direction, and the second superconducting armature winding is wound on two adjacent inner stator slots, and the first and second superconducting armature windings are respectively sealed by the first and second cooling devices . The utility model adopts a double-stator structure, and there is no problem of rotational sealing of the cooling fluid, and has the advantages of simple and reliable structure, low loss, and high power density, and is suitable for direct-drive low-speed wind power generating sets.

Description

A High Temperature Superconducting Permanent Magnet Wind Power Generator with Double Stator Structure

technical field

The utility model relates to a high temperature superconducting permanent magnet motor with a double stator structure, in particular to a high temperature superconducting permanent magnet wind power generator with a double stator structure.

Background technique

The single-unit capacity of wind turbines has reached the megawatt level, and the volume and weight of the generators have also increased, which will increase the installation and maintenance costs of the motors. The development of superconducting technology is expected to solve these problems. Superconducting motors have the advantages of high power density, low loss, and high efficiency, and can effectively reduce the volume and weight of the motor. Although the superconducting wire has no loss when it is connected to DC, it will produce loss when it is connected to AC. Therefore, the DC excitation winding of a traditional superconducting motor is a superconductor, while the AC armature uses a normal conductor. However, the DC excitation winding is located on the rotor and is a rotating part, which will cause difficulty in sealing the coolant when it is rotating, which is an unreliable factor. This will become the weak link of megawatt-level direct-drive superconducting wind turbines.

Contents of the invention

In order to overcome the above-mentioned problems in the prior art, the utility model provides a high-temperature superconducting permanent-magnet wind-driven generator with a double-stator structure, which uses permanent magnets for excitation, and the stator armature uses superconducting materials, so there is no problem of rotating seals and AC loss Small, suitable for direct-drive low-speed wind turbines.

The technical scheme that the utility model adopts is:

The utility model includes a casing, an inner stator, an outer stator and a rotor. The rotating shaft is installed on the casing through bearings. It is characterized in that: in the casing, the rotor is a hollow cup-shaped rotor. Permanent magnets are evenly distributed on the outer wall along the circumference; the rotor is provided with an inner stator along the circumference, and the rotor is provided with an outer stator along the circumference. There are air gaps between the inner stator and the outer stator and the permanent magnets on the inner and outer walls of the rotor respectively. ; The inner side of the outer stator is evenly distributed along the circumferential direction with outer stator slots along the axial direction of the rotating shaft, the first superconductor armature windings are wound on the two adjacent outer stator slots, and the first superconductor armature windings pass through the first cooling device Sealing; the outer side of the inner stator is evenly distributed along the circumferential direction with inner stator slots along the axial direction of the rotating shaft and corresponding to each outer stator slot inside the outer stator, and the second superconducting armature winding is wound on the two adjacent inner stator slots. The outer parts of the two superconducting armature windings are sealed by the second cooling device.

The first cooling device and the second cooling device are filled with cooling liquid.

The cooling liquid is liquid nitrogen.

The permanent magnet is a tile-shaped patch type radially magnetized permanent magnet.

The material of the permanent magnet is NdFeB.

The number of the outer stator slots of the outer stator and the inner stator slots of the inner stator are both 12.

The number of permanent magnets on the inner and outer walls of the rotor is 10 respectively.

The first superconducting armature winding and the second superconducting armature winding adopt high-temperature superconducting wires.

The first superconducting armature winding and the second superconducting armature winding are both racetrack-shaped and adopt a fractional slot concentrated winding structure.

The beneficial effects of the utility model are:

1. There is no problem of rotary sealing of coolant, and the reliability is high.

2. Double stator structure, the amplitude of the current in the superconductor is small, and the number of pole pairs of the motor is small, the frequency of the current in the superconductor is low, and the reduction of the current amplitude and frequency reduces the AC loss of the motor.

3. The hollow cup-shaped rotor has small mass, low moment of inertia, and high utilization rate of wind energy.

4. Double air gap structure further reduces the volume and weight of the motor.

Description of drawings

Fig. 1 is a schematic diagram of the axial structure of the utility model.

Fig. 2 is a partial enlarged view of the winding of the utility model.

Fig. 3 is a sectional view of the utility model along the A-A direction.

Fig. 4 is a cross-sectional view along the B-B direction of the present utility model.

Fig. 5 is a schematic structural view of the first superconducting armature winding and the first cooling device.

Fig. 6 is a structural diagram of a permanent magnet.

In the figure: 1, outer stator, 2, inner stator, 3, rotor, 4, permanent magnet, 5-1, first superconducting armature winding, 5-2, second superconducting armature winding, 6-1, first Cooling device, 6-2, second cooling device, 7-1, first air gap, 7-2, second air gap, 8, casing, 9, rotating shaft, 10, bearing.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, Figure 3, Figure 4, Figure 5, and Figure 6, it includes a casing 8, an inner stator 2, an outer stator 1 and a rotor 3, and the rotating shaft 9 is installed on the casing 8 through a bearing 10; the casing 8 Inside, the rotor 3 is a hollow cup-shaped rotor, the bottom of the rotor 3 is fixedly connected to the rotating shaft 9, the inner and outer walls of the rotor 3 are evenly distributed with permanent magnets 4 along the circumference; An outer stator 1 is arranged along the circumference, and there is an air gap between the inner stator 2 and the outer stator 1 and the permanent magnets 4 on the inner and outer walls of the rotor 3 respectively; Outer stator slots, as shown in Figure 2, racetrack-shaped first superconducting armature windings 5-1 are wound on adjacent two outer stator slots, and the first superconducting armature windings 5-1 pass through the first cooling device 6 -1 seal; the outer side of the inner stator 2 is evenly distributed along the circumferential direction with inner stator slots along the axial direction of the rotating shaft 9 and corresponding to each outer stator slot inside the outer stator 1, and two adjacent inner stator slots are wound with racetrack-shaped The second superconducting armature winding 5-2, and the outside of the second superconducting armature winding 5-2 is sealed by the second cooling device 6-2. The structures of the first superconducting armature winding and the second superconducting armature winding are the same, and the structures of the first cooling device and the second cooling device are the same.

The first cooling device 6-1 and the second cooling device 6-2 are filled with cooling liquid, which is liquid nitrogen.

The permanent magnet 4 is a tile-shaped patch type radially magnetized permanent magnet.

The material of the permanent magnet 4 is NdFeB.

The number of the outer stator slots of the outer stator 1 and the inner stator slots of the inner stator 2 are equal to 12.

The number of permanent magnets 4 on the inner and outer walls of the rotor 3 is equal to 10.

The first superconducting armature winding 5-1 and the second superconducting armature winding 5-2 use high-temperature superconducting wires.

The first superconducting armature winding 5-1 and the second superconducting armature winding 5-2 are racetrack-shaped and adopt a fractional slot concentrated winding structure.

The outer stator 1 is fixed on the casing 8, and the air gap between the outer stator 1 and the rotor 3 is a first air gap 7-1. The inner stator 2 is fixed on the casing 8, and the air gap between the inner stator 2 and the rotor 3 is the second air gap 7-2.

As shown in Fig. 1, Fig. 3 and Fig. 4, the outer stator 1 is provided with 12 outer stator slots, the inner stator 2 is provided with 12 inner stator slots, and the first superconducting armature winding 5-1 of the high temperature superconducting wire is and the second superconducting armature winding 5-2 are wound into a racetrack shape, wherein the first superconducting armature winding 5-1 is sealed in the first cooling device 6-1 filled with liquid nitrogen, installed on the outer stator 1, and one of its raceways The two effective sides of the shaped coil are respectively placed in two adjacent outer stator slots in space. The second superconducting armature winding 5-2 is sealed in the second cooling device 6-2 filled with liquid nitrogen, installed on the inner stator 2, and the two effective sides of a racetrack-shaped coil are placed adjacent to each other in space In the two inner stator slots, and correspondingly placed with the outer stator coils. The two sets of armature windings are finally connected in antiphase and parallel, and connected to the power grid through a superconducting transformer and power switching devices.

Considering that wind turbines are generally huge in size and extremely high in weight, and their installation and maintenance are very difficult, the structure of the motor should be simplified as much as possible, and the parts with low reliability should be eliminated. Superconducting materials can effectively reduce the volume and weight of the motor due to its huge current density, but in traditional megawatt-level direct-drive superconducting wind turbines, the superconductor is located on the rotor and needs to be sealed and cooled while rotating , which is the weak link. If the superconducting part is transferred to the stator armature, the original rotary seal can be changed to a static seal, which can not only make full use of the advantages of high current density of superconducting materials, but also effectively improve the reliability of the motor and reduce maintenance cost. However, there is a problem of AC loss in the AC superconducting armature, so the utility model adopts a double stator structure, and the two sets of stator armatures each share half of the stator current, so that the current in the superconductor is halved, and combined with the low speed and low frequency of the motor, it can Effectively reduce AC loss. In addition, the double-stator structure makes the rotor in the shape of a hollow cup, and the moment of inertia is very low, which can improve the utilization rate of wind energy. The double-air-gap structure can further reduce the volume and weight of the motor.

Concrete implementation work process of the present utility model:

The wind rotor blades of the unit rotate and drag the rotating shaft 9 to rotate clockwise or counterclockwise at a certain speed, and the rotating shaft 9 drives the rotor 3 and the permanent magnet 4 on its surface to rotate between the outer stator 1 and the inner stator 2, making the air gap 7-1 Rotating magnetic fields appear respectively in and 7-2, their rotation rate and direction are the same, but the polarity is opposite. The two rotating magnetic fields respectively cause the internal magnetic fluxes of the coils on the outer stator 1 and the inner stator 2 to change, and an induced potential is generated by electromagnetic induction. Then it is connected to the power grid through superconducting transformers and power switching devices, and the three-phase AC power is transmitted outward.

The above-mentioned specific embodiments are used to explain the utility model, rather than to limit the utility model. Within the spirit of the utility model and the scope of protection of the claims, any modifications and changes made to the utility model fall into the scope of the utility model. scope of protection.

Claims (9)

1. A high-temperature superconducting permanent magnet wind generator with a double-stator structure, including a casing (8), an inner stator (2), an outer stator (1) and a rotor (3), and the rotating shaft (9) passes through the bearing (10) It is installed through the casing (8), and its features are: inside the casing (8), the rotor (3) is a hollow cup-shaped rotor, the bottom of the rotor (3) is fixedly connected with the rotating shaft (9), and inside the rotor (3), Permanent magnets (4) are evenly distributed on the outer wall along the circumference; the inner stator (2) is arranged on the inner circumference of the rotor (3), and the outer stator (1) and the inner stator (2) are arranged on the outer circumference of the rotor (3). 1. There are air gaps between the outer stator (1) and the permanent magnets (4) on the inner and outer walls of the rotor (3); the inner side of the outer stator (1) is evenly spaced along the circumferential direction with outer magnets along the axis of the rotating shaft (9). Stator slots, the first superconducting armature windings (5-1) are wound on two adjacent outer stator slots, and the outside of the first superconducting armature windings (5-1) is sealed by the first cooling device (6-1); The outer side of the inner stator (2) is evenly distributed along the circumferential direction with inner stator slots along the axial direction of the rotating shaft (9) and corresponding to each outer stator slot inside the outer stator (1). The adjacent two inner stator slots are wound with the first Two superconducting armature windings (5-2), the outside of the second superconducting armature winding (5-2) is sealed by the second cooling device (6-2). 2. A high temperature superconducting permanent magnet wind power generator with double stator structure according to claim 1, characterized in that: the first cooling device (6-1) and the second cooling device (6-2) Filled with coolant. 3. A high-temperature superconducting permanent magnet wind-driven generator with double stator structure according to claim 2, characterized in that: said cooling liquid is liquid nitrogen. 4. A high temperature superconducting permanent magnet wind power generator with double stator structure according to claim 1, characterized in that: the permanent magnet (4) is a tile-shaped patch type radially magnetized permanent magnet . 5. A high temperature superconducting permanent magnet wind power generator with double stator structure according to claim 1, characterized in that: the material of the permanent magnet (4) is NdFeB. 6. A high temperature superconducting permanent magnet wind power generator with double stator structure according to claim 1, characterized in that: the outer stator slot of the outer stator (1) and the inner stator slot of the inner stator (2) The quantity is 12. 7. A high temperature superconducting permanent magnet wind power generator with double stator structure according to claim 1, characterized in that: the number of permanent magnets (4) on the inner and outer walls of the rotor (3) is 10 each indivual. 8. A high temperature superconducting permanent magnet wind generator with double stator structure according to claim 1, characterized in that: the first superconducting armature winding (5-1) and the second superconducting armature winding ( 5-2) High temperature superconducting wire is used. 9. A high temperature superconducting permanent magnet wind generator with double stator structure according to claim 1, characterized in that: the first superconducting armature winding (5-1) and the second superconducting armature winding ( 5-2) They are all racetrack-shaped, using fractional slot concentrated winding structure.