Five-degree-of-freedom magnetic suspension flywheel energy storage device

Abstract

The utility model discloses a five-degree-of-freedom magnetic suspension flywheel energy storage device which comprises an energy storage flywheel, a rotor casing, a base, a stator shaft, a motor / generator stator and a motor / generator rotor. According to the five-degree-of-freedom magnetic suspension flywheel energy storage device, a permanent magnet biased axial magnetic suspension bearing rotor, a permanent magnet biased axial magnetic suspension bearing stator, a permanent magnet radial magnetic suspension bearing A stator, a permanent magnet radial magnetic suspension bearing A rotor, a permanent magnet radial magnetic suspension bearing B stator and a permanent magnet radial magnetic suspension bearing B rotor are utilized; five-degree-of-freedom suspension of a motor / generator rotor is achieved through the two permanent magnet type radial magnetic suspension bearings, abrasion is smaller compared with a traditional mechanical bearing, and power consumption of an energy storage device can be reduced; the energy storage flywheel, the rotor casing, the base and the stator shaft are utilized to form a compact structure, and the axial occupied space is low.

Description

Technical Field

[0001] The utility model relates to an energy storage device, in particular to a five-degree-of-freedom magnetic levitation flywheel energy storage device. Background Technique

[0002] The flywheel energy storage device is a highly mechatronic energy storage device, and its main structure includes a flywheel, a support bearing, an electric / generator, a power electronic converter, and a vacuum chamber. Compared with other common energy storage technologies, flywheel energy storage has the advantages of high power density, high energy storage density, high efficiency, short response time, long service life, and environmental friendliness; for existing flywheel energy storage devices such as the patent with the patent number CN111541335B, its axial space occupancy is still relatively large. Mechanical bearings are mainly used in the flywheel energy storage system to support rotating components and reduce friction. Although mechanical bearings have the advantages of strong load-bearing capacity and low friction coefficient, the precision requirements for mechanical bearings are high. Therefore, their manufacturing cost is relatively high, and there are certain requirements for the use environment, and the installation and maintenance are relatively cumbersome. Therefore, a five-degree-of-freedom magnetic levitation flywheel energy storage device is proposed. Content of the Utility Model

[0003] Purpose of the utility model: To provide a five-degree-of-freedom magnetic levitation flywheel energy storage device with a compact structure, small wear, low power consumption and stable performance.

[0004] Technical solution: The five-degree-of-freedom magnetic levitation flywheel energy storage device provided by the utility model includes an energy storage flywheel, a rotor housing, a base, a stator shaft, an electric / generator stator, and an electric / generator rotor;

[0005] The lower end of the stator shaft is coaxially fixed on the base; a permanent magnet biased axial magnetic levitation bearing stator is coaxially fixed on the upper end of the stator shaft; the energy storage flywheel is coaxially fixed on the outer wall of the rotor housing; a magnetic isolation ring is coaxially fixed on the upper inner wall of the rotor housing; the electric / generator stator is coaxially fixed in the middle of the stator shaft; the electric / generator rotor is coaxially installed in the middle of the inner wall of the rotor housing and cooperates with the electric / generator stator; a permanent magnet radial magnetic levitation bearing B stator is coaxially fixed on the upper side of the stator shaft; a permanent magnet radial magnetic levitation bearing B rotor that cooperates with the permanent magnet radial magnetic levitation bearing B stator is fixed on the inner wall of the magnetic isolation ring; a permanent magnet radial magnetic levitation bearing A stator is coaxially fixed on the outer circumferential wall of the base; a permanent magnet radial magnetic levitation bearing A rotor that cooperates with the permanent magnet radial magnetic levitation bearing A stator is coaxially fixed on the lower side of the inner wall of the rotor housing.

[0006] Further, there is a first air gap with a height of 0.25 - 1 mm between the permanent magnet biased axial magnetic levitation bearing rotor and the permanent magnet biased axial magnetic levitation bearing stator.

[0007] Furthermore, there is a second air gap with a width of 0.25 - 2 mm between the outer circumferential wall of the rotor of the permanent magnet type radial magnetic suspension bearing A and the inner circumferential wall of the stator of the permanent magnet type radial magnetic suspension bearing A.

[0008] Furthermore, there is a third air gap with a width of 0.25 - 2 mm between the inner circumferential wall of the rotor of the motor / generator and the outer circumferential wall of the stator of the motor / generator.

[0009] Furthermore, there is a fourth air gap with a width of 0.25 - 2 mm between the inner circumferential wall of the rotor of the permanent magnet type radial magnetic suspension bearing B and the outer circumferential wall of the stator of the permanent magnet type radial magnetic suspension bearing B.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: By using the rotor of the permanent magnet biased axial magnetic suspension bearing and the stator of the permanent magnet biased axial magnetic suspension bearing, the stator of the permanent magnet type radial magnetic suspension bearing A and the rotor of the permanent magnet type radial magnetic suspension bearing A, as well as the stator of the permanent magnet type radial magnetic suspension bearing B and the rotor of the permanent magnet type radial magnetic suspension bearing B, a permanent magnet biased axial magnetic suspension bearing and two permanent magnet type radial magnetic suspension bearings are formed to realize the five-degree-of-freedom suspension of the rotor of the motor / generator. Compared with the traditional mechanical bearing, the wear is smaller, and the power consumption of the energy storage device can be reduced; during charging, the stator shaft, the stator of the motor / generator, and the rotor of the motor / generator operate as a motor, which drives the rotor of the motor / generator to rotate at a high speed, and the input electric energy is converted into the rotational kinetic energy of the energy storage flywheel; during discharging, the stator shaft, the stator of the motor / generator, and the rotor of the motor / generator operate as a generator, and the energy storage flywheel drives the rotor of the motor / generator to rotate, converting the rotational kinetic energy into electric energy and outputting it to the electrical load; by using the energy storage flywheel, the rotor housing, the base, and the stator shaft, a compact structure is formed, and the axial occupied space is relatively low. Description of the Drawings

[0011] Figure 1 is a sectional view of the present utility model;

[0012] Figure 2 is a perspective view of the present utility model;

[0013] Figure 3 is a perspective assembly view of the present utility model;

[0014] In the figure: 1. Energy storage flywheel; 2. Rotor housing; 3. Base; 4. Stator shaft; 5. Stator of the motor / generator; 6. Stator of the permanent magnet type radial magnetic suspension bearing A; 7. Rotor of the permanent magnet type radial magnetic suspension bearing A; 8. Rotor of the motor / generator; 9. Rotor of the permanent magnet biased axial magnetic suspension bearing; 10. Stator of the permanent magnet biased axial magnetic suspension bearing; 11. Stator of the permanent magnet type radial magnetic suspension bearing B; 12. Rotor of the permanent magnet type radial magnetic suspension bearing B; 13. Magnetic isolation ring. Detailed implementation manners

[0015] The technical solution of the present utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of the present utility model is not limited to the described embodiments.

[0016] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0017] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left", "right", "front", "rear", "upper", "lower", "top", "bottom", etc. are all based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0018] Embodiment 1:

[0019] As Figures 1-3 shown, a five-degree-of-freedom magnetic levitation flywheel energy storage device provided by the present utility model includes: an energy storage flywheel 1, a rotor housing 2, a base 3, a stator shaft 4, an electric / generator stator 5, a permanent magnet type radial magnetic levitation bearing A stator 6, a permanent magnet type radial magnetic levitation bearing A rotor 7, an electric / generator rotor 8, a permanent magnet biased axial magnetic levitation bearing rotor 9, a permanent magnet biased axial magnetic levitation bearing stator 10, a permanent magnet type radial magnetic levitation bearing B stator 11, and a permanent magnet type radial magnetic levitation bearing B rotor 12;

[0020] A bottom center hole is coaxially arranged at the center of the base 3; the lower end of the stator shaft 4 is coaxially fixed on the bottom center hole; a top center hole is coaxially fixed at the center of the permanent magnet biased axial magnetic suspension bearing stator 10; the upper end of the stator shaft 4 is coaxially fixed on the top center hole; the electric / generator stator 5 is coaxially fixed in the middle of the stator shaft 4; the permanent magnet radial magnetic suspension bearing B stator 11 is coaxially fixed on the upper side of the stator shaft 4; the inner circumferential wall of the permanent magnet radial magnetic suspension bearing A stator 6 is coaxially fixed on the outer circumferential wall of the base 3; the energy storage flywheel 1 is coaxially fixed on the outer wall of the rotor housing 2; a magnetic isolation ring 13 is coaxially fixed on the upper inner wall of the rotor housing 2; the outer wall of the permanent magnet radial magnetic suspension bearing B rotor 12 is fixed on the inner wall of the magnetic isolation ring 13 for cooperation with the permanent magnet radial magnetic suspension bearing B stator 11; the electric / generator rotor 8 is coaxially installed in the middle of the inner wall of the rotor housing 2 for cooperation with the electric / generator stator 5; the permanent magnet radial magnetic suspension bearing A rotor 7 is coaxially fixed on the lower side of the inner wall of the rotor housing 2 for cooperation with the permanent magnet radial magnetic suspension bearing A stator 6.

[0021] The permanent magnet biased axial magnetic suspension bearing rotor 9, the permanent magnet biased axial magnetic suspension bearing stator 10, the permanent magnet radial magnetic suspension bearing A stator 6, the permanent magnet radial magnetic suspension bearing A rotor 7, the permanent magnet radial magnetic suspension bearing B stator 11 and the permanent magnet radial magnetic suspension bearing B rotor 12 are utilized to form a permanent magnet biased axial magnetic suspension bearing and two permanent magnet radial magnetic suspension bearings, realizing the five-degree-of-freedom suspension of the electric / generator rotor 8, with less wear compared to traditional mechanical bearings and capable of reducing the power consumption of the energy storage device; during charging, the stator shaft 4, the electric / generator stator 5 and the electric / generator rotor 8 operate as a motor, driving the electric / generator rotor 8 to rotate at high speed, and the input electrical energy is converted into the rotational kinetic energy of the energy storage flywheel 1; during discharging, the stator shaft 4, the electric / generator stator 5 and the electric / generator rotor 8 operate as a generator, and the energy storage flywheel 1 drives the electric / generator rotor 8 to rotate, converting the rotational kinetic energy into electrical energy and outputting it to the electrical load; the energy storage flywheel 1, the rotor housing 2, the base 3 and the stator shaft 4 are utilized to form a compact structure with a relatively low axial space occupation.

[0022] Further, there is a first air gap with a height of 0.25 - 1 mm between the permanent magnet biased axial magnetic suspension bearing rotor 9 and the permanent magnet biased axial magnetic suspension bearing stator 10, and the preferred height of the first air gap is 0.5 mm.

[0023] Further, there is a second air gap with a width of 0.25 - 2 mm between the outer circumferential wall of the permanent magnet radial magnetic suspension bearing A rotor 7 and the inner circumferential wall of the permanent magnet radial magnetic suspension bearing A stator 6, and the preferred width of the second air gap is 0.7 mm.

[0024] Furthermore, there is a third air gap with a width of 0.25 - 2 mm between the inner circumferential wall of the motor / generator rotor 8 and the outer circumferential wall of the motor / generator stator 5. The preferred width of the third air gap is 0.7 mm.

[0025] Furthermore, there is a fourth air gap with a width of 0.25 - 2 mm between the inner circumferential wall of the permanent magnet type radial magnetic suspension bearing B rotor 12 and the outer circumferential wall of the permanent magnet type radial magnetic suspension bearing B stator 11. The preferred width of the fourth air gap is 0.7 mm.

[0026] In the five-degree-of-freedom magnetic suspension flywheel energy storage device provided by the present utility model, the energy storage flywheel 1 is made of a metal material or a non-metallic composite material; the rotor housing 2, the base 3, the stator shaft 4, and the magnetic isolation ring 13 are all made of non-magnetic conductive metal materials.

[0027] As described above, although the present utility model has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present utility model itself. Various changes may be made in its form and details without departing from the spirit and scope of the present utility model defined by the appended claims.

Claims

1. A five-degree-of-freedom magnetic levitation flywheel energy storage device, characterized in that: It includes an energy storage flywheel (1), a rotor housing (2), a base (3), a stator shaft (4), an electric / generator stator (5), and an electric / generator rotor (8); The lower end of the stator shaft (4) is coaxially fixed on the base (3); a permanent magnet biased axial magnetic suspension bearing stator (10) is coaxially fixed on the upper end of the stator shaft (4); the energy storage flywheel (1) is coaxially fixed on the outer wall of the rotor housing (2); a magnetic isolation ring (13) is coaxially fixed on the upper inner wall of the rotor housing (2); the electric / generator stator (5) is coaxially fixed in the middle of the stator shaft (4); the electric / generator rotor (8) is coaxially installed in the middle of the inner wall of the rotor housing (2) and is matched with the electric / generator stator (5); a permanent magnet radial magnetic suspension bearing B stator (11) is coaxially fixed on the upper side of the stator shaft (4); a permanent magnet radial magnetic suspension bearing B rotor (12) that is matched with the permanent magnet radial magnetic suspension bearing B stator (11) is fixed on the inner wall of the magnetic isolation ring (13); a permanent magnet radial magnetic suspension bearing A stator (6) is coaxially fixed on the outer circumferential wall of the base (3); a permanent magnet radial magnetic suspension bearing A rotor (7) that is matched with the permanent magnet radial magnetic suspension bearing A stator (6) is coaxially fixed on the lower side of the inner wall of the rotor housing (2).

2. The five-degree-of-freedom magnetic levitation flywheel energy storage device according to claim 1, wherein: There is a first air gap with a height of 0.25 - 1 mm between the permanent magnet biased axial magnetic suspension bearing rotor (9) and the permanent magnet biased axial magnetic suspension bearing stator (10).

3. The five-degree-of-freedom magnetic levitation flywheel energy storage device according to claim 1, wherein: There is a second air gap with a width of 0.25 - 2 mm between the outer circumferential wall of the permanent magnet radial magnetic suspension bearing A rotor (7) and the inner circumferential wall of the permanent magnet radial magnetic suspension bearing A stator (6).

4. The five-degree-of-freedom magnetic levitation flywheel energy storage device according to claim 1, wherein: There is a third air gap with a width of 0.25 - 2 mm between the inner circumferential wall of the electric / generator rotor (8) and the outer circumferential wall of the electric / generator stator (5).

5. The five-degree-of-freedom magnetic levitation flywheel energy storage device according to claim 1, wherein: There is a fourth air gap with a width of 0.25 - 2 mm between the inner circumferential wall of the permanent magnet radial magnetic suspension bearing B rotor (12) and the outer circumferential wall of the permanent magnet radial magnetic suspension bearing B stator (11).

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