Disc type motor rotor structure and flywheel energy storage device

Abstract

The invention discloses a disc type motor rotor structure and a flywheel energy storage device, and relates to the technical field of flywheel energy storage equipment, the disc type motor rotor structure comprises a mounting ring plate, the mounting ring plate is internally provided with a cooling channel, and the cooling channel is connected to an external cooling circulation system; a plurality of magnetic grooves are formed in the mounting ring plate, and magnetic steel assemblies are arranged in the magnetic grooves; the magnetic steel assembly comprises outer-layer magnetic steel and inner-layer magnetic steel, the inner-layer magnetic steel is composed of a plurality of inner-layer magnetic steel sections which are arranged in a segmented mode along the circumference, and the magnetizing directions of the adjacent inner-layer magnetic steel sections are opposite. A temperature sensor is further arranged in the cooling channel. According to the invention, the technical problems of lack of heat dissipation design and limited motor power density in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flywheel energy storage devices, in particular to a disc motor rotor structure and a flywheel energy storage device. BACKGROUND

[0002] When a common flywheel energy storage device adopts a disc motor assembly, a large amount of heat will be generated due to eddy current loss and friction between the mounting ring plate and the magnetic steel during high-speed rotation. The existing structure lacks targeted heat dissipation design, which leads to heat accumulation, material performance degradation, and shortens the service life of the device. At the same time, the traditional structure cannot monitor the temperature state of the key parts in real time, and it is difficult to predict overheating or abnormal wear, which poses a safety hazard. In addition, the arrangement of the magnetic steel does not fully optimize the magnetic field distribution, which limits the improvement of the motor power density. SUMMARY

[0003] The purpose of the present application is to solve at least one of the above technical problems by providing a disc motor rotor structure and a flywheel energy storage device.

[0004] In a first aspect, the present application provides a disc motor rotor structure, comprising: a mounting ring plate, the mounting ring plate is internally provided with a cooling channel, and the cooling channel is connected to an external cooling circulation system; a plurality of magnetic grooves are arranged on the mounting ring plate, and a magnetic steel assembly is arranged in the magnetic groove; the magnetic steel assembly comprises an outer magnetic steel and an inner magnetic steel, the inner magnetic steel is composed of a plurality of inner magnetic steel segments arranged along the circumference, and the magnetization directions of adjacent inner magnetic steel segments are opposite; a temperature sensor is further arranged in the cooling channel.

[0005] Optionally, the disc motor rotor structure is arranged on both end surfaces of a flywheel rotor, and the flywheel rotor and the disc motor rotor structure are arranged in a housing; a motor stator is further arranged in the housing, an annular mounting groove is arranged on the end surface of the flywheel rotor facing the motor stator, and the mounting ring plate is arranged in the annular mounting groove and is in interference fit with the inner circumferential surface of the annular mounting groove.

[0006] Optionally, a partition is further arranged on the mounting ring plate, and a plurality of stress relief grooves are arranged on the partition.

[0007] Optionally, an annular fitting groove is arranged on the side of the mounting ring plate away from the motor stator, a motor rotor yoke is arranged in the annular fitting groove, and the motor rotor yoke is adhesively connected with the magnetic steel assembly.

[0008] Optionally, the plurality of magnetic grooves are arranged on the mounting ring plate in a circumferential interval.

[0009] Optionally, the cooling channel is arranged in a radial serpentine through manner inside the mounting ring plate, and an inlet and an outlet are respectively arranged at both ends of the cooling channel, and the inlet and the outlet are respectively in communication with the external cooling circulation system.

[0010] Optionally, the outer layer magnetic steel comprises a whole ring magnetic steel embedded on the outer circumferential side of the magnetic slot; the inner layer magnetic steel comprises a plurality of inner layer magnetic steel segments evenly divided along the circumference and embedded on the inner circumferential side of the magnetic slot; the number of the inner layer magnetic steel segments comprises 4-8 segments.

[0011] Optionally, the temperature sensor comprises a first temperature sensor and a second temperature sensor; the first temperature sensor is embedded on the inner wall of the cooling channel, and the second temperature sensor is embedded at the contact position of the magnetic steel assembly and the magnetic slot.

[0012] Optionally, the temperature sensor is communicatively connected with the controller of the external cooling circulation system through a wireless module.

[0013] In the second aspect, the embodiment of the present application further provides a flywheel energy storage device comprising the disc-type motor rotor structure and the flywheel rotor provided by the embodiment of the present application, wherein the disc-type motor rotor structure is arranged on the two end surfaces of the flywheel rotor.

[0014] The present application provides a disc-type motor rotor structure and a flywheel energy storage device, wherein a cooling channel is arranged inside the mounting ring plate, so that the heat of the mounting ring plate and the magnetic steel can be quickly dissipated; a temperature sensor array is embedded, so that the temperature of the key position can be monitored in real time; and the double-layer segmented magnetic steel is arranged, so that the uniformity of the air gap magnetic density is improved, the motor efficiency is improved, and the technical problems of the prior art, such as the lack of heat dissipation design and the limitation of motor power density, are solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 FIG. 1 is a structural schematic diagram of a flywheel energy storage device integrated with a disc-type motor rotor structure according to an embodiment of the present application; Figure 2 FIG. 2 is a sectional view of a mounting ring plate according to an embodiment of the present application; Figure 3 FIG. 3 is a top view of a magnetic steel assembly according to an embodiment of the present application; Figure 4 FIG. 4 is an enlarged schematic diagram of the positional relationship between a cooling channel and a stress relief groove according to an embodiment of the present application.

[0017] In the figure: 1, mounting ring plate, 11, cooling channel, 12, stress relief groove, 13, partition, 2, magnetic steel assembly, 21, outer layer magnetic steel, 211, magnetic groove, 22, inner layer magnetic steel, 3, temperature sensor, 4, wireless module, 5, shell, 6, flywheel rotor, 7, motor stator, 8, external cooling circulation system, 9, motor rotor yoke. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] Figure 1 is a structural schematic diagram of a flywheel energy storage device integrated with a disc type motor rotor structure according to an embodiment of the present application. As shown in Figure 1 , it comprises a mounting ring plate 1 and a magnetic steel assembly 2. Figure 2 is a sectional view of a mounting ring plate according to an embodiment of the present application. As shown in Figure 2 , the mounting ring plate 1 is internally provided with a cooling channel 11, and the cooling channel 11 is connected to an external cooling circulation system 8; the mounting ring plate 1 is provided with a plurality of magnetic grooves 211, and the magnetic grooves 211 are internally provided with the magnetic steel assembly 2.

[0020] Figure 3 is a top view of a magnetic steel assembly according to an embodiment of the present application. As shown in Figure 3 , the magnetic steel assembly 2 comprises an outer layer magnetic steel 21 and an inner layer magnetic steel 22, the inner layer magnetic steel 22 is composed of a plurality of inner layer magnetic steel segments arranged along a circumference, and the magnetization directions of adjacent inner layer magnetic steel segments are opposite; the cooling channel 11 is further provided with a temperature sensor 3.

[0021] Preferably, the material of the magnetic steel assembly 2 is neodymium iron boron magnetic steel, the thickness of the outer layer magnetic steel 21 is 5-8 mm; the central angle of each inner layer magnetic steel segment is 45°-90°; the inner layer magnetic steel 22 is fixed in the magnetic groove 211 of the mounting ring plate 1 by epoxy resin adhesion.

[0022] Specifically, as shown in Figure 1 , the disc type motor rotor structure is arranged at both end faces of the flywheel rotor 6, and the flywheel rotor 6 and the disc type motor rotor structure are arranged in the shell 5.

[0023] Specifically, the motor stator 7 is arranged in the shell 5, and the flywheel rotor 6 is provided with an annular mounting groove on the end face facing the motor stator 7, and the mounting ring plate 1 is arranged in the annular mounting groove and is in interference fit with the outer circumferential surface of the annular mounting groove, so that the inner wall of the annular mounting groove exerts a pre-stress on the mounting ring plate 1 to offset part of the centrifugal stress and enhance the connection strength.

[0024] In the embodiment of the application, the flywheel rotor 6 is provided with a disc motor rotor structure on both upper and lower sides to improve the rotation speed and energy storage efficiency of the flywheel rotor 6. Taking the upper disc motor rotor structure as an example, the motor stator 7 is fixed to the top plate of the shell 5, and the disc motor rotor structure is arranged on the upper end face of the flywheel rotor 6, that is, the motor stator 7 and the disc motor rotor are arranged in the axial direction of the flywheel rotor 6. Compared with the axial extension layout of the conventional radial motor, the axial layout in the embodiment of the application significantly reduces the space occupation and is beneficial to reducing the overall volume of the energy storage flywheel.

[0025] Specifically, as shown in Figure 2 , a plurality of magnetic grooves 211 are arranged on the mounting ring plate 1 in a circumferential direction.

[0026] It should be noted that the high-speed rotation of the energy storage flywheel will cause the magnetic steel assembly 2 to bear a large centrifugal force. By embedding the magnetic steel assembly 2 in the magnetic groove 211, the magnetic steel assembly 2 can be effectively prevented from falling off, and the structural stability can be ensured. At the same time, the temperature sensor 3 can capture the temperature change of the key part in real time, and provide data support for safe operation of the equipment.

[0027] Preferably, as shown in Figure 1 , the cooling channel 11 is arranged in a radial serpentine manner inside the mounting ring plate 1, and the two ends of the cooling channel 11 are respectively provided with an inlet and an outlet, which are respectively communicated with the external cooling circulation system 8.

[0028] Preferably, the width of the cooling channel 11 is 1-3mm, the wall thickness is 1-2mm, and the spacing of the cooling channel 11 is 5-10mm.

[0029] When rotating at high speed, the eddy current loss of the mounting ring plate 1 and the magnetic steel assembly 2 will generate a large amount of heat, and if the heat is not dissipated in time, the material strength will decrease. The embodiment of the application provides a serpentine cooling channel 11, so that the cooling medium (such as silicon oil) flowing in the channel can take away the heat, and the temperature rise of the mounting ring plate 1 can be controlled within 50℃, solving the problem of insufficient heat dissipation of the traditional structure.

[0030] Figure 4 is an enlarged schematic view of the positional relationship between the cooling channel and the stress relief groove according to the embodiment of the application. As shown in Figure 2 and Figure 4As shown, the mounting ring plate 1 is further provided with a partition 13, and a plurality of stress relief grooves 12 are arranged on the partition 13. The partition 13 is arranged between the vector magnetic grooves 211, and the stress relief grooves 12 extend radially along the mounting ring plate 1 and axially through the partition 13. The cooling channels 11 and the stress relief grooves 12 are alternately distributed in the radial direction.

[0031] The cooling channels 11 are complementary to the stress relief grooves 12 in releasing stress while dissipating heat. When the mounting ring plate 1 bears torque, the cooling channels 11 and the stress relief grooves 12 together provide deformation space, which can reduce the stress concentration coefficient by more than 40%, avoid local fatigue fracture, and solve the structural strength problem of the disc motor rotor in a high-speed scenario.

[0032] Specifically, the side of the mounting ring plate 1 away from the motor stator 7 is provided with an annular matching groove, and the motor rotor yoke 9 is arranged in the annular matching groove. The motor rotor yoke 9 is adhesively connected with the magnetic steel assembly 2, which not only fixes the magnetic steel but also assists in forming a magnetic circuit and sharing part of the torque.

[0033] Specifically, as shown in the figure, Figure 3 The outer layer magnetic steel 21 includes a whole ring magnetic steel and is embedded on the outer circumferential side of the magnetic groove 211. The inner layer magnetic steel 22 includes a plurality of inner layer magnetic steel segments evenly divided along the circumferential direction and is embedded on the inner circumferential side of the magnetic groove 211. The number of inner layer magnetic steel segments includes 4-8 segments, and the magnetization directions of adjacent inner layer magnetic steel segments are opposite, i.e., differ by 180°.

[0034] The magnetic field distribution of the conventional whole ring magnetic steel is prone to edge distortion. In the double-layer segmented design provided by the embodiment of the application, the whole ring structure of the outer layer magnetic steel 21 ensures the basic magnetic field strength, and the inner layer magnetic steel 22 cancels out the magnetic field distortion by alternating magnetization, so that the air gap magnetic density uniformity is improved by more than 20%, and the motor efficiency is improved by 3%-5%.

[0035] Preferably, the temperature sensor 3 includes a first temperature sensor and a second temperature sensor. The first temperature sensor is embedded on the inner wall of the cooling channel 11, and the second temperature sensor is embedded at the contact position of the magnetic steel assembly 2 and the magnetic groove 211.

[0036] Preferably, one first temperature sensor is arranged every 3-5 magnetic grooves 211 on the inner wall of the cooling channel 11, and a total of 4-8 first temperature sensors are arranged. Two to four second temperature sensors are implanted at the contact surface of the magnetic steel assembly 2 and the mounting ring plate 1 to realize omnidirectional temperature monitoring.

[0037] Preferably, the temperature sensor 3 is in communication connection with the controller of the external cooling circulation system 8 through a wireless module 4.

[0038] Preferably, the external cooling circulation system 8 comprises a circulating pump, a radiator and a temperature controller, forming a closed-loop heat dissipation circuit; the temperature controller dynamically adjusts the cooling medium flow according to the temperature data of the temperature sensor 3, and optimizes the magnetizing measurement of the magnetic steel in combination with the flywheel speed and the load state, so as to maximize the efficiency.

[0039] In the embodiment of the application, the first sensor can monitor the real-time temperature of the cooling medium, the second sensor can directly capture the temperature of the magnetic steel assembly 2, and the controller dynamically adjusts the flow of the cooling system 8 according to the sensor data to realize precise temperature control and automatically trigger the protection mechanism when the temperature exceeds the threshold, thereby improving the safety of the equipment operation.

[0040] The disc motor rotor structure provided by the embodiment of the application cooperates the cooling channel and the stress relief groove to improve heat dissipation and structural strength, optimizes the magnetic field by using double-layer segmented magnetic steel, and realizes precise monitoring by using a temperature sensor, so that it can adapt to the harsh environment of high-speed rotation and meet the application requirements of energy storage flywheels and other equipment.

[0041] According to the energy storage device provided by the embodiment of the application, by adopting the above structure, the device is smaller in size, higher in efficiency and stronger in reliability, and is suitable for power grid frequency modulation, distributed energy storage and other scenes.

[0042] The embodiment of the application also provides a flywheel energy storage device, which comprises the disc motor rotor structure and the flywheel rotor provided by the embodiment of the application, and the disc motor rotor structure is arranged on the two end surfaces of the flywheel rotor.

[0043] The flywheel energy storage device provided by the embodiment of the application solves the contradiction between heat dissipation and structural strength by arranging the complementary structure of the serpentine cooling channel and the stress relief groove in the mounting ring plate; the double-layer segmented magnetic steel is used to optimize the magnetic field distribution and improve the efficiency of the motor; the temperature sensor is integrated to realize real-time monitoring and intelligent temperature control, thereby enhancing the reliability of the device. Compared with the traditional structure, the energy storage flywheel provided by the application is reduced by more than 30% in size, prolonged by more than 10,000 hours in service life, and has a charge-discharge cycle efficiency of more than 88%, so that the disc motor can be efficiently and stably applied in the high-speed energy storage scene.

[0044] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved. Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A disc motor rotor structure, characterized in that, include: A mounting ring plate is provided with a cooling channel inside the mounting ring plate, and the cooling channel is connected to an external cooling circulation system; The mounting ring plate is provided with multiple magnetic grooves, and magnetic steel assemblies are arranged in the magnetic grooves; the magnetic steel assembly includes an outer layer of magnetic steel and an inner layer of magnetic steel, and the inner layer of magnetic steel is composed of multiple inner layer magnetic steel segments arranged in sections along the circumference, with adjacent inner layer magnetic steel segments having opposite magnetization directions; a temperature sensor is also provided in the cooling channel.

2. The disc motor rotor structure according to claim 1, characterized in that: The disc motor rotor structure is disposed on both ends of the flywheel rotor, and both the flywheel rotor and the disc motor rotor structure are disposed within the housing; The housing also contains a motor stator, and the flywheel rotor has an annular mounting groove on its end face facing the motor stator. The mounting ring plate is disposed in the annular mounting groove and its outer circumferential surface is interference-fitted with the inner circumferential surface of the annular mounting groove.

3. The disc motor rotor structure according to claim 2, characterized in that: The mounting ring plate has an annular mating groove on the side opposite to the motor stator, and the motor rotor yoke is provided in the annular mating groove. The motor rotor yoke is glued to the magnet assembly.

4. The disc motor rotor structure according to claim 1, characterized in that: The mounting ring plate is also provided with a partition, and the partition is provided with multiple stress-relieving grooves.

5. The disc motor rotor structure according to claim 1, characterized in that: The plurality of magnetic slots are arranged circumferentially on the mounting ring plate.

6. The disc motor rotor structure according to claim 1, characterized in that: The cooling channel is arranged radially in a serpentine pattern inside the mounting ring plate. The two ends of the cooling channel are respectively provided with an inlet and an outlet, and the inlet and the outlet are respectively connected to the external cooling circulation system.

7. The disc motor rotor structure according to claim 1, characterized in that: The outer magnet includes a complete ring magnet, which is embedded on the outer periphery of the magnetic groove; The inner magnet comprises multiple inner magnet segments evenly distributed along the circumference and embedded in the inner circumference of the magnetic groove; the number of inner magnet segments includes 4-8 segments.

8. The disc motor rotor structure according to claim 1, characterized in that: The temperature sensor includes a first temperature sensor and a second temperature sensor; the first temperature sensor is embedded in the inner wall of the cooling channel, and the second temperature sensor is embedded at the contact surface between the magnet assembly and the magnetic groove.

9. The disc motor rotor structure according to claim 1, characterized in that: The temperature sensor is connected to the controller of the external cooling circulation system via a wireless module.

10. A flywheel energy storage device, characterized in that, The invention includes the disc motor rotor structure and flywheel rotor as described in any one of claims 1-9, wherein the disc motor rotor structure is disposed on both end faces of the flywheel rotor.

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