Disc type motor rotor structure with low vibration, low loss and low rotational inertia

Abstract

The utility model provides a disc type motor rotor structure with low vibration, low loss and low rotational inertia, which comprises a rotor disc, magnetic steel and a carbon fiber ring, a plurality of supporting spokes are uniformly arranged on the rotor disc along the circumferential direction, first limiting parts are arranged on two sides of the supporting spokes, second limiting parts are arranged on two sides of the magnetic steel, and the carbon fiber ring is arranged on the rotor disc. The second limiting part is clamped with the first limiting part, a first gap is formed between the first limiting part and the second limiting part, a second gap is formed between the first end of the magnetic steel and the rotor disc, the first gap and the second gap are filled with elastic glue, and the periphery of the magnetic steel is sleeved with the carbon fiber ring. According to the rotor structure, the gaps are formed in the abutting positions of the rotor disc and the magnetic steel and filled with the elastic glue, vibration of the magnetic steel in the rotating process of the rotor can be relieved, and therefore vibration and noise of the axial motor are effectively reduced. The rotor disc is partially or completely made of light-weight special engineering plastics, eddy current heating can be effectively avoided, loss is reduced, rotational inertia is reduced, and the response speed of the motor is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to axial magnetic field motor rotor technical field, concretely relates to a disc type motor rotor structure of low vibration, low loss and low rotational inertia. BACKGROUND

[0002] Axial magnetic field permanent magnet motor namely disc type motor, because compact structure, small, light weight, torque density is high, is widely used on the market. The fixing of the rotor magnet steel of the existing disc type motor adopts the mode of winding carbon fiber and has become a mainstream method, however, although carbon fiber has enough strength, the strong centrifugal force generated under the high speed rotation of the magnet steel will also cause the carbon fiber to produce larger tensile deformation, thereby making the magnet steel loose and producing vibration in operation, influence motor service life.

[0003] In addition, the rotor disc of the disc type motor mainly realizes the supporting effect of the magnet steel, needs higher strength, and can resist the tension of the carbon fiber winding without deformation, therefore, the rotor disc is usually made of metal material in the current market application. When the metal is in the changing magnetic field or the metal moves in the magnetic field, induced electromotive force will be generated in the metal body, thereby generating current in the metal body. This current flows along a closed loop in the metal, forming eddy current. The eddy current formed by the metal material in the rotor disc will produce additional heat on the one hand, which puts forward higher requirements for the heat dissipation of the disc type motor, and on the other hand, the eddy current will also cause more energy loss. The disc type motor has large rotor diameter and large rotational inertia, resulting in slow response of the motor.

[0004] Therefore, developing a rotor fixing structure with shock absorption, anti eddy current loss and low rotational inertia has good market application prospect.

[0005] It should be noted that the above introduction to the technical background is only to facilitate the clear and complete description of the technical scheme of the present application, and to facilitate the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. CONTENT OF THE UTILITY MODEL

[0006] The utility model discloses a disc type motor rotor structure of low vibration, low loss and low rotational inertia, which overcomes the defects of the prior art, and can greatly alleviate the vibration and noise of the magnet steel during the rotation of the rotor, improve the stability of the long-time operation of the rotor, and reduce the eddy current heating and energy loss to the maximum extent, save energy and protect the environment.

[0007] In order to achieve the above object, the utility model provides a kind of disc motor rotor structure of low vibration, low loss and low moment of inertia, including rotor disc, magnetic steel and carbon fiber ring, the rotor disc is uniformly provided with several support spokes along the circumference, the both sides of the support spoke are provided with first limiting part, the both sides of the magnetic steel are provided with second limiting part, the second limiting part is connected with the first limiting part, so that the magnetic steel is connected and fixed between the adjacent support spoke, first gap is arranged between the first limiting part and the second limiting part, second gap is arranged between the first end of the magnetic steel and the rotor disc, the first gap and the second gap are filled with elastic glue, the carbon fiber ring is sleeved on the outer periphery of the second end of the magnetic steel.

[0008] Further, the first limiting part is concave, and the second limiting part is convex, or the first limiting part is convex, and the second limiting part is concave.

[0009] Further, the elastic glue includes but is not limited to one of silicone rubber glue, polyurethane glue, polyester elastomer and epoxy resin glue.

[0010] Further, the first limiting part and the second limiting part are both square.

[0011] Further, the rotor disc and the support spoke are both made of aluminum or special engineering plastic.

[0012] Further, the rotor disc includes a base and a support ring, the inner periphery of the support ring is connected and fixed on the outer periphery of the base, and the support spokes are uniformly arranged along the circumference of the outer periphery of the support ring.

[0013] Further, the base is made of aluminum, and the support ring and the support spoke are made of special engineering plastic.

[0014] Further, the special engineering plastic includes but is not limited to one of polyether ether ketone, polyamide imide, polyimide, polybenzimidazole and thermoplastic polyimide.

[0015] Further, the carbon fiber ring is formed by winding a carbon fiber belt in multiple layers on the outer periphery of the magnetic steel.

[0016] The above scheme of the utility model has the following beneficial effects:

[0017] 1. The disc motor rotor structure of low vibration, low loss and low moment of inertia provided by the utility model sets first gap at the position where the rotor disc and the magnetic steel are connected, sets second gap at the position where the bottom of the magnetic steel and the rotor disc abut, fills elastic glue in the first gap and the second gap, greatly alleviates the vibration of the magnetic steel during the rotation of the rotor, effectively reduces the vibration and noise of the axial motor, and improves the stability of the long-time operation of the rotor.

[0018] 2. The rotor structure of the utility model discloses can all or at least near and support the part of magnetic steel with special engineering plastics, in satisfying carbon fiber ring tension and for magnetic steel bearing capacity, the support spoke of plastic movement in the magnetic field formed by magnetic steel will not form eddy current, can reduce magnetic field eddy current heating and energy loss to the maximum, reduce the burden to the heat dissipation system; at the same time, the rotor itself disc of axial motor is large so that its dead weight is larger, the moment of inertia is larger, the rotor disc of special engineering plastics is used to reduce the dead weight of rotor, significantly reduce the moment of inertia, the torque required for starting and the braking torque required for braking are reduced, energy consumption is also effectively reduced, and the running stability of axial motor is better.

[0019] Other beneficial effects of the utility model will be described in detail in the subsequent specific implementation mode part. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the whole structure schematic diagram of the utility model;

[0021] Figure 2 It is the explosion installation schematic diagram of the utility model;

[0022] Figure 3 It is the utility model Figure 1 along A-A section view;

[0023] Figure 4 It is the utility model Figure 1 along B-B section view;

[0024] Figure 5 It is the utility model Figure 4 C place structure enlarged schematic diagram;

[0025] Figure 6 It is the utility model Figure 1 D place structure enlarged schematic diagram;

[0026] Figure 7 It is the explosion installation schematic diagram of the utility model rotor disc structure.

[0027]

Explanation of reference numerals

[0028] 1-rotor disc;11-first limit part;12-base;13-support spoke;14-support ring;2-magnetic steel;21-second limit part;3-carbon fiber ring;4-first gap;5-second gap. SPECIFIC EMBODIMENTS

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner unless there is any contradiction. For example, different embodiments can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in the present invention will not be described separately.

[0030] It should be noted that the terms "setting" and "connecting" should be understood in a broad sense. For example, they can be directly set, installed, or connected, or they can be indirectly set or connected through a central component or a central structure. In addition, the orientations or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in the present invention are based on the orientations or positional relationships shown in the drawings or the conventional placement state or usage state. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure, feature, device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0031] Example 1

[0032] like Figures 1 to 6 As shown, this embodiment provides a disc-type motor rotor structure with low vibration, low loss, and low moment of inertia, including a rotor disk 1, magnets 2, and a carbon fiber ring 3. A plurality of support spokes 13 are evenly arranged along the circumference of the rotor disk 1, that is, the support spokes 13 are evenly arranged along the radial direction of the rotor disk. The support spokes 13 are used to mount the support magnets 2, and the number of mounting spokes 13 is the same as the number of magnets 2. First limiting portions 11 are provided on both sides of the support spokes 13, and second limiting portions 21 are provided on both sides of the magnets 2. The first limiting portions 11 are concave, and the second limiting portions 21 are convex. Specifically, in this embodiment, the first limiting portion 11 is preferably a square groove, and the second limiting portion 21 is a square protrusion. The square protrusion of the second limiting portion 21 is snapped into the square groove of the first limiting portion 11, thereby restricting the installation of the magnets 2 between adjacent support spokes 13 and achieving initial installation and fixation of the magnets 2.

[0033] In other embodiments, the first limiting portion 11 may be convex and the second limiting portion 21 may be concave, which can also achieve the goal of clamping the magnet 2 onto the supporting spoke 13. The specific shapes of the first limiting portion 11 and the second limiting portion 21 may also be circular or other shapes.

[0034] Further, the first limiting portion 11 and the second limiting portion 21 are provided with a first gap 4, in the embodiment, the first limiting portion 11 and the second limiting portion 21 are both square, the first limiting portion 11 and the second limiting portion 21 are both provided with a gap at the abutting position, at this time, the first gap 4 presents a "door" structure; the first end of the magnetic steel 2 and the rotor disc 1 are provided with a second gap 5, that is, after the magnetic steel 2 is clamped and installed on the support spoke 13, the end of the magnetic steel 2 abutting the rotor disc 1 is provided with the second gap 5, the first gap 4 and the second gap 5 are both filled with elastic glue, the carbon fiber ring 3 is sleeved on the outer periphery of the second end of the magnetic steel 2, so as to limit the radial movement of the magnetic steel 2 along the rotor disc 1, the elastic glue is a glue body with good elasticity after solidification, including but not limited to one of silicone rubber glue, polyurethane glue, polyester elastomer, and epoxy resin glue, and the appropriate elastic glue can be selected according to the actual situation and cost consideration, and in the embodiment, the epoxy resin glue is preferred. Specifically, when installing the magnetic steel 2, first, the elastic glue is brushed on the outside of the first limiting portion 11 and / or the second limiting portion 21, and the elastic glue is brushed on the first end of the magnetic steel 2, then the magnetic steel 2 is clamped into the support spoke 13, at this time, the elastic glue will fill in the first gap 4 and the second gap 5, then the carbon fiber ring 3 is formed by winding the carbon fiber band on the outer periphery of the magnetic steel 2 with large tension, and the carbon fiber ring 3 can be stably sleeved on the outer periphery of the magnetic steel 2 through the large tension. After the carbon fiber ring 3 is sleeved on the outer periphery of the magnetic steel 2, the outer periphery of the magnetic steel 2 is flush with the outer end of the support spoke 13. The elastic glue provides certain adhesion for the magnetic steel 2 before the carbon fiber ring 3 is sleeved, so as to prevent the magnetic steel 2 from sliding out of the support spoke 13, and more importantly, the elastic glue can well reduce the vibration of the magnetic steel 2 during the rotation of the rotor, so as to effectively reduce the overall vibration and noise of the motor. The elastic glue located in the first gap 1 can buffer the vibration of the magnetic steel 2 in the rotation direction and the axial direction of the rotor disc 1, and the elastic glue located in the second gap 2 can buffer the vibration of the magnetic steel 2 in the radial direction of the rotor disc 1.

[0035] In other embodiments, the magnetic steel 2 can be clamped into the support spoke 13 first, and then the elastic glue can be injected into the first gap 4 and the second gap 5 by using a syringe injection method, and the person skilled in the art can select a suitable filling method according to the production needs.

[0036] Further, the rotor disc 1 and the support spokes 13 are made of metal aluminum or special engineering plastics, which include but are not limited to one of polyether ether ketone (PEEK), polyamide-imide (PAI), polyimide (PI), polybenzimidazole (PBI), and thermoplastic polyimide (TPI). In the embodiment, the special engineering plastics are preferably polyether ether ketone polymer materials, which have rigidity and flexibility, especially excellent fatigue resistance under alternating stress, comparable to alloy materials, capable of resisting large tension of the carbon fiber ring 3, and more importantly, the PEEK polymer materials also have stable insulation performance, capable of effectively eliminating eddy current generated by the magnetic steel 2, reducing the eddy current heat, and saving energy consumption.

[0037] Embodiment 2

[0038] The structural composition of the embodiment is basically the same as that of Embodiment 1, and the main difference is the structure and preparation material of the rotor disc 1, which is specifically shown in the following. Figure 7 In Embodiment 1, the rotor is integrally formed, and in the embodiment, the rotor disc 1 includes a base 12, support spokes 13, and a support ring 14, the inner periphery of the support ring 14 is clamped on the outer periphery of the base to be fixed, and the support spokes 13 are uniformly arranged along the circumferential direction of the outer periphery of the support ring 14. Among them, the base 12 is made of metal aluminum and can be integrally formed by metal aluminum die casting; and the support spokes 13 and the support ring 14 are made of special engineering plastics, and in the embodiment, polyether ether ketone is preferred. In the embodiment, the support spokes 13 and the support ring 14 are directly injection molded on the outer periphery of the base 12, and in other embodiments, clamping structures can be correspondingly arranged on the inner periphery of the support ring 14 and the inner periphery of the base 12 to be connected and fixed, which can realize quick and stable clamping and fixing, and is not limited here. Polyether ether ketone PEEK is a special high polymer material, and the price is much higher than that of metal aluminum. In the embodiment, only the part directly connected with the magnetic steel 2 is made of polyether ether ketone material, and the base 12 is still made of metal aluminum, which can effectively avoid the eddy current heating of the magnetic steel 2 and reduce the production cost. Moreover, the base 12 is located at the center of the rotor, and although the weight is increased, the center position has little effect on the moment of inertia, and the overall moment of inertia of the rotor can still be effectively reduced.

[0039] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A low vibration, low loss and low moment of inertia disc motor rotor structure comprising a rotor disc (1), a magnetic steel (2) and a carbon fiber ring (3), characterized in that, The rotor disc (1) is uniformly provided with a plurality of support spokes (13) in the circumferential direction, both sides of the support spoke (13) are provided with a first limiting part (11), both sides of the magnetic steel (2) are provided with a second limiting part (21), the second limiting part (21) is clamped with the first limiting part (11), so that the magnetic steel (2) is clamped between the adjacent support spokes (13), the first limiting part (11) and the second limiting part (21) are provided with a first gap (4), the first end of the magnetic steel (2) and the rotor disc (1) are provided with a second gap (5), the first gap (4) and the second gap (5) are filled with elastic glue, the carbon fiber ring (3) is sleeved on the outer periphery of the second end of the magnetic steel (2).

2. The disc motor rotor structure of claim 1, wherein The first limiting part (11) is concave, and the second limiting part (21) is convex, or the first limiting part (11) is convex, and the second limiting part (21) is concave.

3. The disc motor rotor structure of claim 2, wherein The first limiting part (11) and the second limiting part (21) are both square.

4. The disc motor rotor structure of claim 1, wherein The elastic glue includes but is not limited to one of silicone rubber glue, polyurethane glue, polyester elastomer, epoxy resin glue.

5. The disc motor rotor structure of claim 1, wherein The rotor disc (1) and the support spoke (13) are both made of aluminum or special engineering plastics.

6. The disc motor rotor structure of claim 1, wherein The rotor disc (1) includes a base (12) and a support ring (14), the inner periphery of the support ring (14) is clamped on the outer periphery of the base (12) to be fixed, and the support spokes (13) are uniformly arranged in the circumferential direction of the outer periphery of the support ring (14).

7. The disc motor rotor structure of claim 6, wherein The base (12) is made of aluminum, and the support ring (14) and the support spoke (13) are made of special engineering plastics.

8. The low vibration, low loss and low moment of inertia disc motor rotor structure according to claim 5 or claim 7, characterized in that, The special engineering plastics include but are not limited to one of polyether ether ketone, polyamide imide, polyimide, polybenzimidazole and thermoplastic polyimide.

9. The disc motor rotor structure of claim 1, wherein The carbon fiber ring (3) is a carbon fiber belt which is wound in multiple layers on the outer periphery of the magnetic steel (2).

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