Rotor mechanism and electric machine

Abstract

The application relates to the field of motors, in particular to a rotor mechanism and a motor. The rotor mechanism comprises a winding end, a first ring body, a second ring body and a support body. The first ring body is sleeved on the inner side of the winding end, the second ring body is sleeved on the outer side of the winding end, the support body is arranged between the first ring body and the second ring body, the second ring body is pressed on the first ring body through the support body, so that pre-tightening force in the direction of the axis of the second ring body can be provided, and when the rotor mechanism rotates, the winding end can generate centrifugal force in the direction away from the axis of the second ring body and act on the second ring body, and the pre-tightening force is greater than the centrifugal force of the winding end. In the application, the first ring body, the second ring body and the support body are cooperated to fix the winding end, so that outward radial deformation of the winding end during rotation is avoided, and the second ring body is not directly pressed on the outer side of the winding end, so that the force on the winding end with uneven surface caused by manufacturing deviation is more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, and in particular to a rotor mechanism and an electric machine. BACKGROUND

[0002] The variable-speed pumped storage motor is a new type of pumped storage motor, which can adjust the speed by changing the frequency of the rotor current to adapt to different water head and lift changes. In addition, the variable-speed pumped storage motor adopts AC excitation mode, which can effectively improve the operation stability of the pumped storage unit while adjusting the rotor speed.

[0003] In terms of structural design, the key part of the variable-speed pumped storage motor is the rotor winding. The middle straight section of the rotor winding is fixed inside the magnetic yoke core, and the two ends are in a suspended state. This design enables the rotor winding to safely and reliably convert between mechanical energy and electrical energy.

[0004] However, during actual operation, when the motor speed changes, the huge centrifugal force generated by high-speed rotation will cause the end of the rotor winding to have a tendency to deform radially outward. This deformation not only can cause damage to the winding structure and failure of the insulation layer, but also can have a serious impact on safety and reliability.

[0005] Moreover, during the manufacturing and installation of the motor rotor, there may be some deviations, which can cause the end of the winding to not be a perfect cylindrical structure, with some wire rods protruding from the surface and others recessed from the surface. Therefore, for the fixation of the winding end, if a retainer ring or a binding tape is used for direct winding and fixation, the protruding wire rods will be subjected to a larger radial restraint force, while the recessed wire rods will be subjected to a smaller force, resulting in poor uniformity of the force. SUMMARY

[0006] The embodiments of the present application provide a rotor mechanism that fixes the end of the winding to prevent radial deformation of the end of the winding outward, and can improve the uniformity of the force when the end of the winding is fixed.

[0007] To achieve the above-mentioned purpose, according to the first aspect of the present application, a rotor mechanism is provided, comprising:

[0008] a winding end;

[0009] a first ring body sleeved on the inside of the winding end;

[0010] a second ring body sleeved on the outside of the winding end;

[0011] A support body is arranged between the first ring body and the second ring body, the second ring body is pressed on the first ring body by the support body to provide a pre-tightening force in the direction of the second ring body axis, and when the rotor mechanism rotates, the winding end portion can generate a centrifugal force acting on the second ring body in the direction away from the second ring body axis, and the pre-tightening force is greater than the centrifugal force of the winding end portion.

[0012] Optionally, one of the second ring body inner side and the first ring body outer side is connected with one end of the support body, and the other of the second ring body inner side and the first ring body outer side abuts against the other end of the support body.

[0013] Optionally, the number of support bodies is multiple, one end of the multiple support bodies is fixed around the first ring body outer side, and the other end of the multiple support bodies is arranged to form a ring-shaped support position, and the second ring body inner side is fitted on the ring-shaped support position in an interference fit, so as to apply the pre-tightening force to the first ring body outer side by extruding the other end of the support body.

[0014] Optionally, the winding end portion has a first wire bar and a second wire bar, multiple support bodies are arranged in multiple rows in the circumferential direction of the first ring body outer side, and a support gap is formed between adjacent two rows of support bodies, and the support gap can pass through the first wire bar and / or the second wire bar.

[0015] Optionally, the number of support bodies in each row is multiple, and the multiple support bodies are arranged in multiple rows and multiple columns around the first ring body outer side.

[0016] Optionally, the first ring body and the second ring body are coaxially arranged, and the support body is arranged between the first ring body and the second ring body in the radial direction of the first ring body and the second ring body.

[0017] Optionally, the cross section of the support body in the radial direction of the first ring body comprises:

[0018] A first end, one side of the first end can be directed to the air inflow direction of the winding end portion to increase the air inflow resistance;

[0019] A second end, the second end and the first end are respectively located on the opposite sides of the support body, and the second end can increase the flow rate of the air flow passing through the first end.

[0020] Optionally, the side of the first end directed to the air inflow direction is arc-shaped, and the second end gradually tapers in width from the side close to the first end to the side away from the first end.

[0021] Optionally, the cross section of the support body in the radial direction of the first ring body is drop-shaped.

[0022] Optionally, the support body is made by 3D printing.

[0023] According to a second aspect of the present application, there is provided an electric machine comprising the rotor mechanism of the first aspect.

[0024] In the rotor mechanism of the embodiments of the present application, the second ring body has a pre-tightening force in the direction of its axis, and when the rotor is not working, the second ring body is pressed on the first ring body by the support body to exert the pre-tightening force on the first ring body; and when the rotor is working, the winding end portion is directly acted on by a centrifugal force in a direction away from the axis of the second ring body based on the rotation of the rotor, and the second ring body counteracts the centrifugal force by the pre-tightening force to prevent the winding end portion from having outward radial deformation, thereby avoiding damage to the structure of the winding end portion and failure of the insulation layer, and improving the safety and reliability of the rotor mechanism; and in the whole process, the second ring body is not directly pressed on the outside of the winding end portion, so that the winding end portion with uneven surface due to manufacturing deviation is more uniformly stressed.

[0025] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0027] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0028] Figure 1 is a structural schematic view of the winding end portion, the first ring body, the second ring body and the support body of the rotor mechanism provided in the exemplary embodiments of the present disclosure.

[0029] Figure 2 is Figure 1 is a structural schematic view of the first ring body, the second ring body and the support body of the rotor mechanism.

[0030] Figure 3 is Figure 1 is a structural schematic view of the first wire bar, the second wire bar of the rotor mechanism after being expanded in the circumferential direction and the support body.

[0031] Figure 4 is Figure 3 is a local enlarged view of A in

[0032] Figure 5is Figure 1 A cross-sectional view of the support body of the rotor mechanism in the radial direction.

[0033] Explanation of reference numerals:

[0034] 1. First ring body;

[0035] 2. Second ring body;

[0036] 3. Support body; 31, support gap; 32, first end; 33, second end;

[0037] 4. Winding end; 41, first wire bar; 42, second wire bar;

[0038] 5. Air flow. DETAILED DESCRIPTION

[0039] 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] The first aspect of the present application provides a rotor mechanism, which comprises Figure 1 It can be seen that the rotor mechanism comprises a winding end 4, a first ring body 1, a second ring body 2, and a support body 3, the first ring body 1 is sleeved on the inner side of the winding end 4, the second ring body 2 is sleeved on the outer side of the winding end 4, the support body 3 is arranged between the first ring body 1 and the second ring body 2, the second ring body 2 is pressed on the first ring body 1 through the support body 3 to be able to provide a pre-tightening force in the direction of the axis of the second ring body 2, and when the rotor mechanism rotates, the winding end 4 can generate a centrifugal force in the direction away from the axis of the second ring body 2 and act on the second ring body 2, and the pre-tightening force is greater than the centrifugal force of the winding end 4.

[0041] The second ring body 2 has a pre-tightening force in the direction of its axis, when the rotor is not working, the second ring body 2 is pressed on the first ring body 1 through the support body 3 to act the pre-tightening force on the first ring body 1; and when the rotor works, the winding end 4 generates a centrifugal force in the direction away from the axis of the second ring body 2 based on the rotation of the rotor and directly acts on the second ring body 2, the second ring body 2 offsets the centrifugal force through the pre-tightening force to prevent the winding end 4 of the rotor mechanism from outward radial deformation, thereby avoiding the structure of the winding end 4 from damage and the insulation layer from failure, improving the safety and reliability of the rotor mechanism; and in the whole process, the second ring body 2 is not directly pressed on the outer side of the winding end 4, so that the winding end 4 with uneven surface due to manufacturing deviation is stressed more uniformly.

[0042] In some embodiments, the rotor mechanism has a frame, and the first ring body 1 and the second ring body 2 are detachably connected with the frame. Specifically, the first ring body 1 and the second ring body 2 are detachably connected with the rotor frame by bolts.

[0043] In some embodiments, one of the inner side of the second ring body 2 and the outer side of the first ring body 1 is connected with one end of the support body 3, and the other of the inner side of the second ring body 2 and the outer side of the first ring body 1 abuts against the other end of the support body 3.

[0044] There is no fastener such as a bolt between the second ring body 2 and the first ring body 1, and the two are not rigidly connected, but are connected by abutting of the support body 3; during later maintenance, since the second ring body 2 and the first ring body 1 are not rigidly connected, the two are more convenient to disassemble and assemble, making it more convenient to overhaul the winding end portion 4.

[0045] In some embodiments, the number of support bodies 3 is multiple, one end of the multiple support bodies 3 is fixed around the outer side of the first ring body 1, and the other end of the multiple support bodies 3 is arranged to form a ring-shaped support position, and the inner side of the second ring body 2 is fitted on the ring-shaped support position in an interference fit, so as to apply a pre-tightening force to the outer side of the first ring body 1 by extruding the other end of the support body 3. In other ways, one end of the multiple support bodies 3 can also be fixed around the inner side of the second ring body 2, and then the multiple support bodies 3 are fitted on the outer side of the first ring body 1 in an interference fit.

[0046] By fitting the second ring body 2 on the multiple support bodies 3 around the outer side of the first ring body 1 in an interference fit, the first ring body 1 and the second ring body 2 can be conveniently disassembled and assembled, and the connection stability between the two can be guaranteed.

[0047] In some embodiments, in combination with Figures 2-5 It can be seen that the winding end portion 4 has a first wire bar 41 and a second wire bar 42, and the multiple support bodies 3 are arranged in multiple rows in the circumferential direction of the outer side of the first ring body 1, and a support gap 31 is formed between adjacent two rows of support bodies 3, which can pass through the first wire bar 41 and / or the second wire bar 42.

[0048] The support gap 31 formed between adjacent two rows of support bodies 3 can not only be used for the first wire bar 41 and / or the second wire bar 42 to pass through, but also can be used for airflow 5 to flow, which is conducive to heat dissipation of the winding end portion 4.

[0049] In some embodiments, the number of support bodies 3 in each row is multiple, and the multiple support bodies 3 are arranged in multiple rows and multiple columns around the outer side of the first ring body 1. By arranging the support bodies 3 in an array around the outer periphery of the first ring body 1, the connection between the first ring body 1 and the second ring body 2 can be more stable.

[0050] In some embodiments, the first ring body 1 and the second ring body 2 are coaxially arranged, and the support body 3 is arranged between the first ring body 1 and the second ring body 2 along the radial direction of the first ring body 1 and the second ring body 2, so that the first ring body 1 and the second ring body 2 better fit the shape of the winding end portion 4 and better support the winding end portion 4 during rotation.

[0051] In some embodiments, the cross section of the support body 3 in the radial direction of the first ring body 1 comprises:

[0052] The first end 32 is capable of being oriented towards the inflow direction of the air flow 5 of the winding end portion 4 to increase the inflow resistance of the air flow 5;

[0053] The second end 33 is located on the opposite side of the support body 3 from the first end 32, and the second end 33 is capable of increasing the flow rate of the air flow 5 flowing through the first end 32.

[0054] When the air flow 5 flows into the winding end portion 4, it first flows to the first end 32 of the support body 3 to increase the inflow resistance of the air flow 5 through the first end 32 of the support body 3, at which time the air flow 5 can be strongly heat-exchanged with the counterflow of the winding end portion 4 under the disturbance of the first end 32 of the support body 3; and then flows through the second end 33 of the support body 3 and smoothly flows away under the action of the second end 33. Through the structure of the support body 3, the heat exchange efficiency between the air flow 5 and the winding end portion 4 can be improved, and the flow rate of the air flow 5 can be avoided from being excessively affected, which is more conducive to the heat dissipation of the winding end portion 4.

[0055] In some embodiments, the side of the first end 32 oriented towards the inflow direction of the air flow 5 is arc-shaped, and the second end 33 gradually narrows in width from the side close to the first end 32 to the side away from the first end 32.

[0056] The side of the first end 32 oriented towards the inflow direction of the air flow 5 is arc-shaped, which can increase the inflow resistance of the air flow 5 while avoiding completely hindering the flow of the air flow 5 when the air flow 5 flows in; and the second end 33 gradually narrows in width from the side close to the first end 32 to the side away from the first end 32, which can guide the air flow 5 to flow more quickly.

[0057] In some embodiments, the cross section of the support body 3 in the radial direction of the first ring body 1 is drop-shaped. Specifically, the drop shape is a centrally symmetric drop structure.

[0058] In some embodiments, the support body 3 is made by 3D printing. The support body 3 is manufactured by 3D printing technology, so that the structure is no longer limited by the processing conditions and the manufacturing cost is significantly reduced.

[0059] The second aspect of the present application provides an electric machine comprising the rotor mechanism of the first aspect. The electric machine has all the beneficial effects of the rotor mechanism of the first aspect, which will not be repeated here.

[0060] In the description of the application, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0061] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0062] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0063] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment in accordance with the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A rotor mechanism characterized by, The rotor mechanism comprises: a winding end; a first ring body sleeved on the inside of the winding end; a second ring body sleeved on the outside of the winding end; a support body arranged between the first ring body and the second ring body, the second ring body being pressed on the first ring body by the support body to provide a pre-tightening force in the direction of the second ring body axis, and the winding end being able to generate a centrifugal force acting on the second ring body in the direction away from the second ring body axis when the rotor mechanism rotates, the pre-tightening force being greater than the centrifugal force of the winding end; one of the inside of the second ring body and the outside of the first ring body is connected to one end of the support body, and the other of the inside of the second ring body and the outside of the first ring body abuts against the other end of the support body; the cross section of the support body in the radial direction of the first ring body comprises: a first end, one side of which is capable of facing the air inflow direction of the winding end to increase the air inflow resistance; a second end, which is located on the opposite side of the support body from the first end, and is capable of increasing the flow rate of the air flowing through the first end; the side of the first end facing the air inflow direction is arc-shaped, and the second end tapers in width from the side close to the first end to the side away from the first end to form a pointed end.

2. The rotor mechanism of claim 1, wherein The number of support bodies is multiple, one end of the multiple support bodies is fixed around the outside of the first ring body, and the other end of the multiple support bodies is arranged to form an annular support position, and the inside of the second ring body is fitted on the annular support position in an interference fit to apply the pre-tightening force to the outside of the first ring body by extruding the other end of the support body.

3. The rotor mechanism of claim 2, wherein The winding end has a first wire rod and a second wire rod, multiple rows of support bodies are arranged on the circumference of the outside of the first ring body, and support gaps are formed between adjacent two rows of support bodies, which can be passed through by the first wire rod and / or the second wire rod.

4. The rotor mechanism of claim 3, wherein The number of support bodies in each row is multiple, and the multiple support bodies are arranged in multiple rows and multiple columns around the outside of the first ring body.

5. The rotor mechanism according to any one of claims 1 to 4, characterized by The first ring body and the second ring body are coaxially arranged, and the support body is arranged along the radial direction of the first ring body and the second ring body between the first ring body and the second ring body.

6. The rotor mechanism of claim 1, wherein The cross section of the support body in the radial direction of the first ring body is drop-shaped.

7. An electric machine characterized by The rotor mechanism comprises any one of claims 1-6.

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