Rotor automatic positioning brushless motor

Abstract

The utility model discloses a brushless motor capable of automatically positioning a rotor. The brushless motor comprises a stator assembly, a rotor assembly and a positioning magnet. The rotor assembly is rotationally connected with the stator assembly; the positioning magnets are arranged on the opposite surfaces of the stator assembly and the rotor assembly and comprise a first magnet and a second magnet, the first magnet is arranged on the stator assembly, and the second magnet is arranged on the rotor assembly and is opposite to the first magnet in position; and the magnetic poles of the first magnet and the second magnet on the opposite surfaces are opposite. According to the brushless motor, the first magnet and the second magnet are respectively arranged on the opposite surfaces of the stator assembly and the rotor assembly by utilizing the characteristic that magnetic poles attract each other, and when no power source is input into the motor, the rotor assembly slowly stops rotating. Therefore, the stopping position can be fixed after the rotor rotates each time, and the stopping position of the propeller can be parallel to the heading direction of the fuselage, namely consistent with the heading direction of the aircraft, so that the flight resistance is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a brushless motor with automatic rotor positioning. Background Technology

[0002] The rotor position of a commonly used brushless motor is random when it stops rotating. This is difficult to achieve when certain scenarios require the rotor to remain stationary at a specific point or along a specific line. A typical example is the external rotor brushless motor used in vertical takeoff and landing (VTOL) drones. While the brushless motor for VTOL stops rotating during the cruise phase, the rotor's stopping position is random, or the propeller swings irregularly due to wind, resulting in excessive drag during flight and affecting flight endurance. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a brushless motor with automatic rotor positioning, which can fix the stopping position of the rotor after each rotation, ensuring that the propeller stops parallel to the direction of flight, i.e., consistent with the direction of flight, thereby reducing flight drag.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A brushless motor with automatic rotor positioning, comprising

[0006] Stator assembly;

[0007] The rotor assembly is rotatably connected to the stator assembly;

[0008] Positioning magnets are disposed on opposite surfaces of the stator assembly and the rotor assembly, including a first magnet and a second magnet. The first magnet is disposed on the stator assembly, and the second magnet is disposed on the rotor assembly opposite to the position of the first magnet. The magnetic poles of the first magnet and the second magnet are opposite on opposite surfaces.

[0009] According to an embodiment of the present invention, an automatic rotor positioning brushless motor has at least the following beneficial effects: The brushless motor of the present invention utilizes the magnetic pole attraction characteristic. A first magnet and a second magnet are respectively arranged on the opposite surfaces of the stator assembly and the rotor assembly. When the motor has no power input, the rotor assembly gradually stops rotating. As the rotational speed and torque gradually decrease and reach a certain level, the S pole of the first magnet of the stator assembly and the N pole of the second magnet of the rotor assembly attract each other, or the N pole of the first magnet of the first assembly and the S pole of the second magnet of the rotor assembly attract each other, causing the rotor assembly to stop rotating. Moreover, the stopping position is fixed each time. It should be noted that there is a certain distance between the first magnet and the second magnet, so that the attractive force is not too strong and will not affect the normal rotation of the motor. Therefore, the stopping position of the rotor can be fixed after each rotation, thus the stopping position of the drone propeller equipped with this automatic rotor positioning brushless motor is also fixed, which is beneficial to improving the overall performance of the drone.

[0010] According to some embodiments of this utility model, the positioning magnets are provided in 4 groups, and the magnetic poles of the 4 first magnets on opposite sides are N pole, S pole, N pole and S pole in sequence, and the magnetic poles of the 4 second magnets on opposite sides are S pole, N pole, S pole and N pole in sequence.

[0011] The advantage is that the positioning magnets are set in four groups, which are easy to set up, ensuring a certain fixed attraction force, while not generating large rotational resistance.

[0012] According to some embodiments of the present invention, four first magnets are evenly arranged along the circumference of the stator assembly, and four second magnets are evenly arranged along the circumference of the rotor assembly.

[0013] The advantages are: this arrangement promotes uniform force distribution on the stator and rotor assemblies, prevents shaft wobbling, and reduces rotational resistance. It should be noted that the rotor assembly has two stopping positions, which are located on the same straight line. Therefore, after stopping, the propeller lies on this straight line. It is only necessary to ensure that this straight line is parallel to the fuselage's forward direction during motor installation, i.e., consistent with the aircraft's forward direction, thereby reducing flight drag.

[0014] According to some embodiments of the present invention, the stator assembly includes a stator base, a mounting frustum is provided in the middle of the stator base, an iron core is sleeved on the outer side of the mounting frustum, and a first mounting groove is provided on the top surface of the mounting frustum for mounting the first magnet.

[0015] The advantage is that the stator assembly with a stator base facilitates the setting of the mounting frustum and the first mounting slot, making it convenient to install the iron core and the first magnet.

[0016] According to some embodiments of the present invention, the rotor assembly includes a rotor base, the rotor base is provided with a second mounting groove opposite to the first mounting groove, the second mounting groove is used to install a second magnet, and the inner side of the rotor base is provided with a permanent magnet that cooperates with the iron core.

[0017] The advantage is that the rotor assembly has a rotor base and a second mounting slot on the rotor base, which facilitates the installation of the second magnet. It should be noted that copper wire needs to be wound on the iron core, and the rotor base needs to be equipped with a permanent magnet that cooperates with the iron core in order to enable the rotor assembly and the stator assembly to rotate.

[0018] According to some embodiments of the present invention, the first mounting groove and the first magnet, and the second mounting groove and the second magnet are both interference fits.

[0019] The advantage is that the interference fit facilitates the installation of the first and second magnets, while preventing them from separating during use.

[0020] According to some embodiments of the present invention, the first mounting groove and the second mounting groove are cylindrical in shape, and the first magnet and the second magnet are also cylindrical in shape.

[0021] The advantages are that the first and second mounting slots are cylindrical, which is easy to process, and the first and second magnets are also cylindrical, which is easy to process and easy to install. It should be noted that the first and second magnets need to be set with a certain slope.

[0022] According to some embodiments of the present invention, the mounting frustum has a mounting hole in the middle, the mounting hole has a bearing, the bearing has a rotating shaft, and the other end of the rotating shaft is fixedly connected to the rotor base.

[0023] The advantage is that the mounting holes and bearings facilitate the installation of the rotating shaft, and the other end of the rotating shaft is fixedly connected to the rotor base, thereby realizing the rotatable connection between the rotating shaft base and the stator base.

[0024] According to some embodiments of the present invention, both the stator base and the rotor base have heat dissipation holes on their outer surfaces.

[0025] The advantage is that the heat dissipation holes on the outer side of the stator base and rotor base are conducive to the heat dissipation of the stator assembly and rotor assembly, ensuring the motor can run for a long time.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 Exploded view diagram;

[0030] Figure 3 for Figure 2 Schematic diagram of the middle stator base;

[0031] Figure 4 for Figure 2 Schematic diagram of the central rotor base;

[0032] Figure 5 This is a schematic diagram showing the propeller of a drone with the motor mounted on it.

[0033] Reference numerals: First magnet 100, Second magnet 110, Stator base 120, Mounting frustum 130, Iron core 140, First mounting slot 150, Rotor base 160, Second mounting slot 170, Permanent magnet 180, Mounting hole 190, Bearing 200, Rotating shaft 210, Heat dissipation hole 220, Propeller 230. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The following is for reference. Figures 1-5 A brushless motor with automatic rotor positioning is described in detail with reference to a specific embodiment. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0039] like Figures 1-5 As shown, a brushless motor with automatic rotor positioning includes a stator assembly, a rotor assembly, and a positioning magnet.

[0040] The rotor assembly and stator assembly are rotatably connected. Positioning magnets are disposed on opposite surfaces of the stator and rotor assemblies, including a first magnet 100 and a second magnet 110. The first magnet 100 is disposed on the stator assembly, and the second magnet 110 is disposed on the rotor assembly opposite to the first magnet 100. The magnetic poles of the first magnet 100 and the second magnet 110 on their opposite surfaces are opposite. This brushless motor utilizes the mutual attraction of magnetic poles. The first magnet 100 and the second magnet 110 are respectively disposed on opposite surfaces of the stator and rotor assemblies. When the motor has no power input, the rotor assembly gradually stops rotating, and the rotational speed and torque gradually decrease until they reach a certain level, such as... Figure 2 As shown, the mutual attraction between the S pole of the first magnet 100 of the stator assembly and the N pole of the second magnet 110 of the rotor assembly, or the mutual attraction between the N pole of the first magnet 100 of the stator assembly and the S pole of the second magnet 110 of the rotor assembly, causes the rotor assembly to stop rotating. Moreover, the stopping position is fixed each time. It should be noted that there is a certain distance between the first magnet 100 and the second magnet 110, so that the attractive force is not too strong and will not affect the normal rotation of the motor. Therefore, the stopping position of the rotor can be fixed after each rotation, and thus the stopping position of the drone propeller 230 equipped with this automatic positioning brushless motor is also fixed. Figure 5As shown, this is beneficial to improving the overall performance of the drone.

[0041] Specifically, such as Figure 2 As shown, four sets of positioning magnets are provided. The four first magnets 100 have their opposite poles arranged in the order of N, S, N, and S, respectively. The four second magnets 110 have their opposite poles arranged in the same order. The four sets of positioning magnets facilitate setup, ensure a certain level of fixed attraction, and minimize rotational resistance. The attraction force of the four sets of positioning magnets should be greater than the motor's own magnetic reluctance and the drag during flight. When the motor is powered off, the rotor assembly gradually stops rotating. As the rotational speed and torque gradually decrease and reach a certain level, utilizing the principle of like poles repelling and unlike poles attracting, if the second magnet 110 on the rotor assembly and the first magnet 100 on the stator assembly have similar poles at their proximal ends when the rotor assembly is nearing a stop, they repel each other, pushing the rotor assembly to continue rotating. If the second magnet 110 on the rotor assembly and the first magnet 100 on the stator assembly have unlike poles at their proximal ends when the rotor assembly is nearing a stop, they attract each other, and the rotor stops rotating. In summary, the rotor assembly always stops at the opposite pole positions of the first magnet 100 and the second magnet 110. It should be noted that the four first magnets 100 are evenly distributed circumferentially along the stator assembly, and the four second magnets 110 are evenly distributed circumferentially along the rotor assembly. This arrangement helps to distribute the force evenly on the stator and rotor assemblies, prevents shaft wobbling, and reduces rotational resistance. It should also be noted that the rotor assembly has two stopping positions at this time, and these two stopping positions are located on the same straight line. Therefore, after stopping, the propeller 230 is located on this straight line. It is only necessary to ensure that this straight line is parallel to the fuselage's forward direction during motor installation, i.e., consistent with the aircraft's forward direction, thereby reducing flight drag.

[0042] like Figure 2 and Figure 3 As shown, the stator assembly includes a stator base 120, a mounting frustum 130 in the middle of the stator base 120, an iron core 140 fitted around the outer side of the mounting frustum 130, and a first mounting groove 150 on the top surface of the mounting frustum 130 for mounting a first magnet 100. The stator base 120 in the stator assembly facilitates the installation of the mounting frustum 130 and the first mounting groove 150, making it convenient to install the iron core 140 and the first magnet 100.

[0043] Figure 2 and Figure 4As shown, the rotor assembly includes a rotor base 160, which has a second mounting groove 170 opposite to the first mounting groove 150. The second mounting groove 170 is used to mount the second magnet 110. The inner side of the rotor base 160 is provided with a permanent magnet 180 that mates with the iron core 140. The rotor assembly with the rotor base 160 and the second mounting groove 170 facilitates the mounting of the second magnet 110. It should be noted that copper wire needs to be wound on the iron core 140, and the rotor base 160 needs to be provided with a permanent magnet 180 that mates with the iron core 140 to enable rotation between the rotor assembly and the stator assembly.

[0044] It should be noted that the first mounting groove 150 and the first magnet 100, and the second mounting groove 170 and the second magnet 110, are both interference fits. The interference fit facilitates the installation of the first magnet 100 and the second magnet 110, and prevents them from separating during use. Furthermore, the first mounting groove 150 and the second mounting groove 170 are cylindrical in shape, as are the first magnet 100 and the second magnet 110. The cylindrical shape of the first mounting groove 150 and the second mounting groove 170 facilitates machining, and the cylindrical shape of the first magnet 100 and the second magnet 110 facilitates both machining and installation. It should be noted that the first magnet 100 and the second magnet 110 require a certain angle.

[0045] like Figure 3 As shown, the mounting frustum 130 has a mounting hole 190 in the middle, a bearing 200 is provided in the mounting hole 190, and a rotating shaft 210 is provided in the bearing 200. The other end of the rotating shaft 210 is fixedly connected to the rotor base 160. The mounting hole 190 and the bearing 200 facilitate the installation of the rotating shaft 210. The fixed connection of the other end of the rotating shaft 210 to the rotor base 160 realizes the rotatable connection between the rotating shaft base and the stator base 120.

[0046] It is worth mentioning that both the stator base 120 and the rotor base 160 have heat dissipation holes 220 on their outer surfaces. The heat dissipation holes 220 on the outer surfaces of the stator base 120 and the rotor base 160 are beneficial for the heat dissipation of the stator assembly and the rotor assembly, ensuring the motor can run for a long time.

[0047] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A brushless motor with automatic rotor positioning, characterized in that, The utility model relates to a kind of magnetic positioning device, including: Stator assembly; Rotor assembly, rotationally connected with the stator assembly; Positioning magnet, set in the opposite surface of the stator assembly and the rotor assembly, including first magnet (100) and second magnet (110), the first magnet (100) is set on the stator assembly, the second magnet (110) is set on the rotor assembly with the position opposite the first magnet (100), the first magnet (100) and the second magnet (110) are opposite in the opposite surface pole.

2. A brushless motor with automatic rotor positioning according to claim 1, characterized in that, The positioning magnet is provided with 4 groups, 4 the first magnet (100) is located in the opposite surface pole in turn N pole, S pole, N pole and S pole, 4 the second magnet (110) is located in the opposite surface pole in turn S pole, N pole, S pole and N pole.

3. A brushless motor with automatic rotor positioning according to claim 1, characterized in that, 4 the first magnet (100) is evenly arranged along the circumference of the stator assembly, and 4 the second magnet (110) is evenly arranged along the circumference of the rotor assembly.

4. A brushless motor with automatic rotor positioning according to claim 1, characterized in that, The stator assembly includes stator base (120), the middle part of the stator base (120) is equipped with installation circular platform (130), the outer side of the installation circular platform (130) is equipped with iron core (140), the top surface of the installation circular platform (130) is equipped with first installation slot (150), and the first installation slot (150) is used to install the first magnet (100).

5. A brushless motor with automatic rotor positioning according to claim 4, characterized in that, The rotor assembly includes rotor base (160), and the rotor base (160) is equipped with second installation slot (170) opposite to the first installation slot (150), and the second installation slot (170) is used to install second magnet (110). The inner side surface of the rotor base (160) is equipped with permanent magnet (180) matched with the iron core (140).

6. A brushless motor with automatic rotor positioning according to claim 5, characterized in that, The first installation slot (150) and the second installation slot (170) are both cylindrical, and the first magnet (100) and the second magnet (110) are also cylindrical.

7. A brushless motor with automatic rotor positioning according to claim 5, characterized in that, The middle part of the installation circular platform (130) is equipped with mounting hole (190), the mounting hole (190) is equipped with bearing (200), the bearing (200) is equipped with rotating shaft (210), and the other end of the rotating shaft (210) is fixedly connected with the rotor base (160).

8. A brushless motor with automatic rotor positioning according to claim 5, characterized in that, The outer side surface of the stator base (120) and the rotor base (160) is equipped with heat dissipation hole (220).

9. A brushless motor with automatic rotor positioning according to claim 5, characterized in that, ​

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