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

Abstract

The invention 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 invention relates to the technical field of axial magnetic field motor rotors, and in particular to a disc-type motor rotor structure with low vibration, low loss and low rotational inertia. Background Art

[0002] Axial magnetic field permanent magnet motors, also known as disc motors, are widely used in the market due to their compact structure, small size, light weight, and high torque density. The use of winding carbon fiber to fix the rotor magnets of existing disc motors has become a mainstream method. However, although the carbon fiber has sufficient strength, the strong centrifugal force generated by the magnets under high-speed rotation will also cause the carbon fiber to have a large tensile deformation, thereby loosening the magnets and generating vibrations during operation, affecting the service life of the motor.

[0003] In addition, the rotor disk of the disc motor mainly supports the magnetic steel, which requires high strength and must be able to withstand the tension of carbon fiber winding without deformation. Therefore, the rotor disk in current market applications is usually made of metal. When the metal is in a changing magnetic field, or when the metal moves in a magnetic field, an 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 currents. On the one hand, the eddy currents formed by the metal material in the rotor disk will generate additional heat, which puts higher requirements on the heat dissipation of the disc motor; on the other hand, eddy currents will also cause more energy loss. Due to the large rotor diameter and large moment of inertia of the disc motor, the motor response is slow.

[0004] Therefore, developing a rotor fixing structure with vibration reduction, eddy current loss prevention and low rotational inertia has good market application prospects.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a disc motor rotor structure with low vibration, low loss and low rotational inertia. By setting a gap at the fixed connection position between the rotor disk and the magnetic steel and filling it with elastic glue, the vibration and noise of the magnetic steel during the rotation of the rotor can be greatly alleviated, and the stability of the rotor in long-term operation can be improved; at the same time, the rotor disk is partially or completely made of polymer materials to minimize eddy current heating and energy loss, thereby saving energy and being environmentally friendly.

[0007] In order to achieve the above-mentioned objectives, the present invention provides a disc motor rotor structure with low vibration, low loss and low rotational inertia, comprising a rotor disc, a magnetic steel and a carbon fiber ring, wherein a plurality of supporting spokes are evenly arranged on the rotor disc along the circumferential direction, a first limiting portion is arranged on both sides of the supporting spokes, a second limiting portion is arranged on both sides of the magnetic steel, the second limiting portion is clamped with the first limiting portion so that the magnetic steel is clamped and fixed between adjacent supporting spokes, a first gap is arranged between the first limiting portion and the second limiting portion, a second gap is arranged between the first end of the magnetic steel and the rotor disc, elastic glue is filled in the first gap and the second gap, and the carbon fiber ring is sleeved on the outer circumference of the second end of the magnetic steel.

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

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

[0010] Furthermore, the first limiting portion and the second limiting portion are both square.

[0011] Furthermore, the rotor disk and the supporting spokes are both made of aluminum or special engineering plastics.

[0012] Furthermore, the rotor disk comprises a base and a support ring, the inner periphery of the support ring is clamped and fixed on the outer periphery of the base, and the support spokes are evenly arranged along the circumferential direction of the outer periphery of the support ring.

[0013] Furthermore, the base is made of aluminum, and the support ring and support spokes are made of special engineering plastics.

[0014] Furthermore, the special engineering plastics include but are not limited to one of polyetheretherketone, polyamideimide, polyimide, polybenzimidazole, and thermoplastic polyimide.

[0015] Furthermore, the carbon fiber ring is formed by winding multiple layers of carbon fiber tape around the periphery of the magnetic steel.

[0016] The above scheme of the present invention has the following beneficial effects:

[0017] 1. The disc motor rotor structure with low vibration, low loss and low rotational inertia provided by the present invention has a first gap set at the position where the rotor disk and the magnetic steel are clamped, a second gap is set at the position where the bottom of the magnetic steel and the rotor disk abut, and elastic glue is filled in the first gap and the second gap, which can greatly alleviate the vibration of the magnetic steel during the rotation of the rotor, thereby effectively reducing the vibration and noise of the axial motor and improving the stability of the rotor during long-term operation.

[0018] 2. In the rotor structure of the present invention, the rotor disk can be made of special engineering plastics in its entirety or at least in the part close to and supporting the magnetic steel. While meeting the tension of the carbon fiber ring and the bearing capacity of the magnetic steel, the supporting spokes made of plastic will not form eddy currents when moving in the magnetic field formed by the magnetic steel, which can minimize the heating and energy loss of the eddy currents in the magnetic field and reduce the burden on the heat dissipation system. At the same time, the rotor of the axial motor has a large disk surface, which makes it heavier and has a larger moment of inertia. The use of special engineering plastics to make the rotor disk can reduce the rotor's own weight and significantly reduce the moment of inertia. The torque required for starting the rotor and the braking torque required for braking are reduced, which also effectively reduces energy consumption. At the same time, the axial motor has better operating stability.

[0019] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the explosion installation of the present invention;

[0022] Figure 3 For the present invention Figure 2 Sectional view along AA;

[0023] Figure 4 For the present invention Figure 2 Sectional view along the middle line BB;

[0024] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at C in the middle;

[0025] Figure 6 For the present invention Figure 1 A magnified schematic diagram of the structure at D in the middle;

[0026] Figure 7 This is a schematic diagram of the explosion installation of the rotor disk structure of the present invention.

[0027] [Description of Reference Numerals]

[0028] 1- rotor disk; 11- first limiting part; 12- base; 13- supporting spokes; 14- supporting ring; 2- magnetic steel; 21- second limiting part; 3- carbon fiber ring; 4- first gap; 5- second gap. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention. The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner without 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 are no longer described separately.

[0030] It should be noted that the terms "set" and "connect" should be understood in a broad sense. For example, it can be directly set, installed, connected, or indirectly set or connected through a central component or a central structure. In addition, the orientation or position relationship indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in the present invention is based on the orientation or position relationship shown in the drawings or the conventional placement state or use state, which is only for the convenience of describing the present invention and simplifying the description, and does 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, and therefore cannot be understood as limiting the present invention.

[0031] Example 1

[0032] like Figures 1 to 6 As shown, this embodiment provides a disc motor rotor structure with low vibration, low loss and low moment of inertia, including a rotor disk 1, a magnetic steel 2 and a carbon fiber ring 3. A plurality of support spokes 13 are evenly arranged along the circumferential direction on the rotor disk 1, that is, a plurality of support spokes 13 are evenly arranged along the radial direction of the rotor disk. The support spokes 13 are used to install the support magnetic steel 2, and the number of the installation spokes 13 is consistent with the number of the magnetic steel 2. A first limiting portion 11 is arranged on both sides of the support spoke 13, and a second limiting portion 21 is arranged on both sides of the magnetic steel 2. The first limiting portion 11 is concave and the second limiting portion 21 is convex. Specifically, in this embodiment, it is preferred that the first limiting portion 11 is a square groove and the second limiting portion 21 is a square convex block. The square convex block of the second limiting portion 21 is correspondingly snapped into the square groove of the first limiting portion 11, and the magnetic steel 2 is installed and restricted between adjacent support spokes 13, so as to achieve the preliminary installation and fixation of the magnetic steel 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 snapping 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, a first gap 4 is provided between the first limiting portion 11 and the second limiting portion 21. In the present embodiment, the first limiting portion 11 and the second limiting portion 21 are both square, and there is a gap at the abutment between the first limiting portion 11 and the second limiting portion 21. At this time, the first gap 4 presents a "door"-shaped structure; a second gap 5 is provided between the first end of the magnetic steel 2 and the rotor disk 1, that is, after the magnetic steel 2 is snap-fitted and installed on the supporting spoke 13, the second gap 5 is provided at one end of the magnetic steel 2 abutting against the rotor disk 1, and the first gap 4 and the second gap 5 are both filled with elastic glue, and the carbon fiber ring 3 is sleeved on the outer periphery of the second end of the magnetic steel 2 to limit the radial movement of the magnetic steel 2 along the rotor disk 1. The elastic glue is a colloid with good elasticity after curing, including but not limited to one of silicone rubber glue, polyurethane glue, polyester elastomer, and epoxy resin glue. A suitable elastic glue can be selected according to actual conditions and cost considerations. In the present embodiment, epoxy resin glue is preferably used. Specifically, when installing the magnetic steel 2, firstly, the elastic glue is applied to the outside of the first limiting portion 11 and / or the second limiting portion 21, and the elastic glue is applied to the first end of the magnetic steel 2, and then the magnetic steel 2 is clamped into the supporting spoke 13. At this time, the elastic glue will fill the first gap 4 and the second gap 5, and then the carbon fiber tape is wrapped around the outer periphery of the magnetic steel 2 with a large tension to form a carbon fiber ring 3. 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 supporting spoke 13. Before the carbon fiber ring 3 is sleeved, the elastic glue provides a certain adhesive force for the magnetic steel 2 to prevent the magnetic steel 2 from slipping out of the supporting spoke 13. More importantly, during the rotation of the rotor, the elastic glue can well reduce the vibration of the magnetic steel 2, thereby effectively reducing the overall vibration and noise of the motor. The elastic glue in the first gap 1 can buffer the vibration of the magnetic steel 2 along the rotation direction and axial direction of the rotor disk 1, while the elastic glue in the second gap 2 can buffer the vibration of the magnetic steel 2 along the radial direction of the rotor disk 1.

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

[0036] Furthermore, the rotor disk 1 and its supporting spokes 13 are made of metal aluminum or special engineering plastics, and the special engineering plastics include but are not limited to one of polyetheretherketone (PEEK), polyamideimide (PAI), polyimide (PI), polybenzimidazole (PBI), and thermoplastic polyimide (TPI). In this embodiment, the special engineering plastic is preferably a polyetheretherketone polymer material, which has rigidity and flexibility, especially outstanding fatigue resistance under alternating stress, comparable to alloy materials, and can withstand the large tension of the carbon fiber ring 3. More importantly, the PEEK polymer material also has stable insulation properties, which can effectively eliminate the eddy current generated by the magnetic field of the magnetic steel 2, reduce the eddy current heat, and save energy consumption.

[0037] Example 2

[0038] The structure of this embodiment is basically the same as that of the embodiment 1, except that the structure and preparation material of the rotor disk 1 are different. Figure 7 As shown. In Example 1, the rotor is integrally formed. In this embodiment, the rotor disk 1 includes a base 12, a support strip 13 and a support ring 14. The inner periphery of the support ring 14 is clamped and fixed on the outer periphery of the base, and the support spokes 13 are evenly arranged along the circumference 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 strips 13 and the support ring 14 are made of special engineering plastics, and polyetheretherketone is preferably used in this embodiment. In this embodiment, the support strips 13 and the support ring 14 are directly injection molded on the outer periphery of the base 12. In other embodiments, corresponding clamping structures can be respectively set on the inner periphery of the support ring 14 and the inner periphery of the base 12 to connect and fix. It only needs to be able to achieve fast and stable clamping and fixation, and no specific limitation is made here. Polyetheretherketone (PEEK) is a special polymer material, and its price is much higher than that of metal aluminum. In this embodiment, only the part directly connected with the magnetic steel 2 is made of polyetheretherketone material, and the base 12 is still made of metal aluminum. On the one hand, it can effectively avoid the eddy current heating of the magnetic steel 2, and at the same time, it can reduce the production cost. Moreover, the base 12 is located at the center of the rotor. Although the weight will increase slightly when it is made of metal material, 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 a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A disc-type motor rotor structure with low vibration, low loss and low moment of inertia, comprising a rotor disc (1), a magnetic steel (2) and a carbon fiber ring (3), characterized in that: A plurality of supporting spokes (13) are evenly arranged on the rotor disk (1) along the circumferential direction, first limiting portions (11) are arranged on both sides of the supporting spokes (13), second limiting portions (21) are arranged on both sides of the magnetic steel (2), the second limiting portions (21) are clamped with the first limiting portions (11) so that the magnetic steel (3) is clamped between adjacent supporting spokes (13), a first gap (4) is arranged between the first limiting portion (11) and the second limiting portion (21), a second gap (5) is arranged between the first end of the magnetic steel (3) and the rotor disk (1), elastic glue is filled in the first gap (4) and the second gap (5), and the carbon fiber ring (3) is sleeved on the outer circumference of the second end of the magnetic steel (2).

2. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 1 is characterized in that: The first limiting portion (11) is concave and the second limiting portion (21) is convex, or the first limiting portion (11) is convex and the second limiting portion (21) is concave.

3. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 2 is characterized in that: The first limiting portion (11) and the second limiting portion (21) are both square.

4. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 1, characterized in that: The elastic glue includes but is not limited to one of silicone rubber glue, polyurethane glue, polyester elastomer, and epoxy resin glue.

5. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 1, characterized in that: The rotor disk (1) and the supporting spokes (13) are both made of aluminum or special engineering plastics.

6. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 1, characterized in that: The rotor disk (1) comprises a base (12) and a support ring (14), the inner periphery of the support ring (14) being clamped and fixed on the outer periphery of the base (12), and the support spokes (13) being evenly arranged along the circumference of the outer periphery of the support ring (14).

7. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 6, characterized in that: The base (12) is made of aluminum, and the support ring (14) and the support spokes (13) are made of special engineering plastics.

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

9. The disc motor rotor structure with low vibration, low loss and low moment of inertia according to claim 1, characterized in that: The carbon fiber ring (3) is formed by winding multiple layers of carbon fiber strips around the outer circumference of the magnetic steel (2).

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