Structure for reducing heat transfer between energy storage flywheel motor and rotor

Abstract

The utility model provides a structure for reducing heat transfer between an energy storage flywheel motor and a rotor, and relates to the technical field of power supply energy storage systems. The synchronous motor comprises a motor shaft, a flywheel rotor, a synchronous inner rotor and a synchronous outer rotor, the motor shaft is connected with the flywheel rotor, the synchronous inner rotor is located on the inner side of the synchronous outer rotor, a motor shaft bearing is arranged at the lower end of the motor shaft, and the motor shaft is connected with the synchronous outer rotor. A flywheel rotor bearing is arranged at the upper end of the flywheel rotor, the flywheel rotor bearing is connected with the synchronous inner rotor, the synchronous inner rotor and the synchronous outer rotor both adopt permanent magnets, and the synchronous inner rotor and the synchronous outer rotor perform torque transmission through magnetic coupling. According to the utility model, on the basis of the principle of double and three layers of heat-insulating glass windows, the original rigid coupling connection of a motor rotor and a flywheel rotor is changed into magnetic coupling coupling connection with an air gap by utilizing the characteristic of small heat dissipation coefficient of air, so that torque transmission is carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply energy storage systems, in particular to a heat transfer structure for reducing the heat transfer between a storage flywheel motor and a rotor. Background Art

[0002] At present, the motor and the rotor use a coaxial or key coupling for torque transmission. However, with this rigid connection method, the heat generated by the motor coil is directly transmitted to the flywheel rotor through the direct contact between the motor rotor shaft and the key coupling, causing the flywheel body to heat up. The operating temperature of the flywheel is within 80°C. The motor has a water cooling system, and the operating temperature of the motor can be ensured by cooling the motor housing. However, the flywheel rotor has no cooling system, and at the same time, the flywheel rotor needs to operate in a quasi-vacuum environment. Therefore, neither air cooling nor water cooling is applicable to the flywheel rotor. After a long time, when the flywheel rotor reaches a certain temperature, it will cause the machine to stop.

[0003] At present, the flywheels operating in the project often experience high-temperature alarms during operation, resulting in machine stops. The high temperature of the rotor equipment is caused by the heat conduction of the motor, and in addition, the flywheel body has no heat dissipation function. Therefore, it is necessary to change the original rigid connection structure between the motor and the flywheel, from a rigid coupling to a magnetic coupling. Summary of the Utility Model

[0004] In view of the deficiencies in the above problems, the utility model provides a heat transfer structure for reducing the heat transfer between a storage flywheel motor and a rotor. Based on the principle of double- and triple-layer insulating glass windows and utilizing the characteristic of the small heat dissipation coefficient of air, the original rigid coupling connection between the motor rotor and the flywheel rotor is changed to a magnetic coupling connection with an air gap for torque transmission.

[0005] To solve the above problems, the utility model provides a heat transfer structure for reducing the heat transfer between a storage flywheel motor and a rotor, including a motor shaft and a flywheel rotor. The motor shaft is connected to the flywheel rotor. Among them, it further includes a synchronous inner rotor and a synchronous outer rotor. The synchronous inner rotor is located inside the synchronous outer rotor. A motor shaft bearing is provided at the lower end of the motor shaft, and the motor shaft is connected to the synchronous outer rotor. A flywheel rotor bearing is provided at the upper end of the flywheel rotor, and the flywheel rotor bearing is connected to the synchronous inner rotor. Both the synchronous inner rotor and the synchronous outer rotor adopt permanent magnets, and the synchronous inner rotor and the synchronous outer rotor perform torque transmission through magnetic coupling.

[0006] Preferably, it further includes an air gap, and the air gap is provided between the synchronous outer rotor and the synchronous inner rotor.

[0007] Preferably, it further includes a flywheel rotor expansion sleeve, and the flywheel rotor bearing is connected to the synchronous inner rotor through the flywheel rotor expansion sleeve.

[0008] Preferably, it further includes a motor rotor tensioning sleeve, and the motor shaft is connected to the synchronous outer rotor through the motor rotor tensioning sleeve.

[0009] Compared with the prior art, the present utility model has the following advantages:

[0010] Based on the principle of double- and triple-layer insulated glass windows, and utilizing the characteristic of small air heat dissipation coefficient, the present utility model changes the connection of the original motor rotor and flywheel rotor by a rigid coupling to a connection by a magnetic coupling with an air gap for torque transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the background art equipment of the present utility model;

[0012] Figure 2 is a schematic structural diagram of an embodiment of the present utility model;

[0013] Figure 3 is a schematic diagram of the simulation experiment results of an embodiment of the present utility model;

[0014] Figure 4 is a schematic diagram of the experiment results of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0016] As Figures 1 to 4 shown, the embodiment of the present utility model includes a motor shaft, a flywheel rotor, a synchronous inner rotor, a synchronous outer rotor, a motor shaft bearing, a flywheel rotor bearing, a flywheel rotor tensioning sleeve and a motor rotor tensioning sleeve, wherein,

[0017] Flywheel rotor bearing: Bears the radial force of the flywheel rotor and keeps the flywheel rotor running axially.

[0018] Flywheel rotor tensioning sleeve: Connects the flywheel rotor shaft and the synchronous inner rotor.

[0019] Synchronous inner rotor: Serves as the driving (driven) torque source of the flywheel rotor and belongs to one end of the magnetic coupler.

[0020] Motor shaft bearing: Bears the radial force of the motor shaft and keeps the motor shaft running axially.

[0021] Motor rotor tensioning sleeve: Connects the motor shaft and the synchronous outer rotor.

[0022] Synchronous outer rotor: Serves as the driving (driven) torque source of the motor rotor and belongs to the other end of the magnetic coupler.

[0023] In this embodiment, the working principle is as follows: The inner and outer rotors adopt permanent magnets, and torque is transmitted through magnetic coupling. The torque between the motor and the flywheel is 10,611 N·m, and a magnetic coupler with an appropriate torque is selected. The synchronous rotor is rigidly connected to the flywheel rotor and the motor shaft through a shrink disc, thereby providing torque transmission.

[0024] In this embodiment, through structural improvement, software is used for simulation tests. Under the working conditions of the original structure, the motor shaft outputs 120 °C (the demagnetization temperature limit), and the temperature of the flywheel rotor rises to 51 °C. As Figure 3 shown.

[0025] In this embodiment, under the working conditions of the new structure, the motor shaft outputs 120 °C (the demagnetization temperature limit), and the temperature of the flywheel rotor does not rise and remains at the room temperature of 22 °C. The air gap isolates heat conduction, so this structure can effectively prevent the problem of overheating of the flywheel rotor caused by the motor heating up. As Figure 4 shown.

[0026] In this embodiment, the magnetic coupler has a conductor rotor and a permanent magnet rotor as connectors for the motor and the driven end. There is an air gap between the driving end and the driven end. The air heat dissipation coefficient is 0.023 W / (m·K), and the heat dissipation coefficient of low alloy steel is 65 W / (m·K), and the former is reduced by more than 2,000 times.

[0027] Persons skilled in the art should connect all the electrical components in this case to their adapted power supplies through wires, and should select a suitable controller according to the actual situation to meet the control requirements. For the specific connection and control sequence, reference should be made to the sequence of the electrical components working successively in the following working principle to complete the electrical connection. The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, and will not explain the electrical control.

[0028] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Persons of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0029] In the description of this specification, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solution of this patent 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. Therefore, it should not be construed as a limitation on this patent application.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this patent application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0031] In this specification, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this specification can be understood according to specific circumstances.

[0032] In this specification, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0033] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0034] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A heat transfer reduction structure between a storage flywheel motor and a rotor, comprising a motor shaft and a flywheel rotor, wherein the motor shaft is connected to the flywheel rotor, and is characterized in that, It also includes a synchronous inner rotor and a synchronous outer rotor. The synchronous inner rotor is located inside the synchronous outer rotor. A motor shaft bearing is provided at the lower end of the motor shaft, and the motor shaft is connected to the synchronous outer rotor. A flywheel rotor bearing is provided at the upper end of the flywheel rotor, and the flywheel rotor bearing is connected to the synchronous inner rotor. Both the synchronous inner rotor and the synchronous outer rotor use permanent magnets, and torque transmission is carried out between the synchronous inner rotor and the synchronous outer rotor through magnetic coupling.

2. The heat transfer structure between the energy storage flywheel motor and the rotor according to claim 1, characterized in that It also includes an air gap, and the air gap is provided between the synchronous outer rotor and the synchronous inner rotor.

3. A heat transfer structure for reducing heat transfer between a motor of an energy storage flywheel and a rotor according to claim 2, characterized in that It also includes a flywheel rotor shrink fit, and the flywheel rotor bearing is connected to the synchronous inner rotor through the flywheel rotor shrink fit.

4. The heat transfer structure for reducing heat transfer between the energy storage flywheel motor and the rotor according to claim 3, characterized in that, It also includes a motor rotor shrink fit, and the motor shaft is connected to the synchronous outer rotor through the motor rotor shrink fit.

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