Brushless motor with external magnetic ring

Abstract

The utility model aims to provide a brushless motor with an external magnetic ring, which comprises a stator assembly, a rotor assembly and a detection assembly, the stator assembly comprises a stator part, a front end cover and a rear end cover, the front end cover and the rear end cover are respectively arranged at two ends of the stator part, the rotor assembly comprises a rotating shaft and a rotor part, the rotor part is coaxially arranged on the rotating shaft, and the detection assembly is arranged on the rotating shaft. The rotating shaft is rotationally connected with the front end cover and the rear end cover, the rotor part is located in the stator part, the two ends of the rotating shaft penetrate out of the front end cover and the rear end cover respectively, and an assembling circular truncated cone is arranged at the end, close to the rear end cover, of the rotating shaft; the electric adjusting plate is arranged on the side face, away from the stator piece, of the rear end cover, a Hall sensor is arranged on the electric adjusting plate and aligned with the magnetic ring, and the cover plate is arranged on the side face, close to the electric adjusting plate, of the rear end cover and used for shielding the electric adjusting plate.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to an externally-mounted magnetic ring brushless motor. Background Art

[0002] A sensorless brushless motor is usually equipped with a position detection device such as a Hall sensor, which can detect the position and speed of the motor rotor in real time, so as to realize precise control of the high-efficiency operation of the brushless motor.

[0003] At present, the market share of sensorless brushless motors in car models is gradually increasing, and consumers' requirements for control accuracy, speed stability, etc. are also getting higher and higher. At present, the magnetic rings of sensorless brushless motors are all located inside the stator of the motor. This type of built-in magnetic ring has the following disadvantages in actual use: First, due to the small internal space of the motor, the induction area of the Hall sensor is limited, resulting in poor induction accuracy and control efficiency of the motor; Second, the magnetic ring is built inside the motor, and it is difficult to disassemble the magnetic ring, which is not conducive to the repair and maintenance of the motor. Therefore, in order to solve the above technical problems, the externally-mounted magnetic ring brushless motor of this application is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an externally-mounted magnetic ring brushless motor that can improve the control accuracy and control efficiency of the motor and is convenient for disassembling and assembling the magnetic ring.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] An externally-mounted magnetic ring brushless motor, comprising:

[0007] A stator assembly, the stator assembly includes a stator member, a front end cover and a rear end cover, and the front end cover and the rear end cover are respectively arranged at both ends of the stator member;

[0008] A rotor assembly, the rotor assembly includes a rotating shaft and a rotor member, the rotor member is coaxially arranged on the rotating shaft, the rotating shaft is rotatably connected to the front end cover and the rear end cover, and the rotor member is located inside the stator member. Both ends of the rotating shaft respectively pass through the front end cover and the rear end cover, and an assembly round table is arranged at one end of the rotating shaft close to the rear end cover; and

[0009] A detection assembly, the detection assembly includes an electronic speed controller board, a magnetic ring and a cover plate. The magnetic ring is sleeved on the assembly round table. The electronic speed controller board is arranged on a side surface of the rear end cover away from the stator member. A Hall sensor is arranged on the electronic speed controller board, and the Hall sensor is aligned with the magnetic ring. The cover plate is arranged on a side surface of the rear end cover close to the electronic speed controller board, and the cover plate is used to shield the electronic speed controller board.

[0010] In one embodiment, a circular ring groove is formed at one end of the assembly frustum near the rotating shaft, and the circular ring groove is used for filling glue.

[0011] In one embodiment, a stepped groove is formed at one end of the rotating shaft away from the assembly frustum.

[0012] In one embodiment, a plurality of rib strips distributed along the axial direction are further arranged on the outer side wall of the rotating shaft.

[0013] In one embodiment, the rotor member includes a rotor iron core, two end plates and a plurality of magnet blocks. The rotating shaft coaxially penetrates through the rotor iron core. The two end plates are both sleeved on the rotating shaft, and the two end plates respectively abut against two ends of the rotor iron core. Each magnet block is arranged on the rotor iron core at equal angles.

[0014] In one embodiment, a plurality of magnetic holes are formed in the rotor iron core, and each magnet block is respectively inserted into each magnetic hole.

[0015] In one embodiment, there are four magnet blocks, and the four magnet blocks are circumferentially and equally angularly distributed relative to the axis of the rotor iron core.

[0016] In one embodiment, the stator member includes a machine shell and a stator coil. The stator coil is arranged on the inner side wall of the machine shell, and the front end cover and the rear end cover are respectively arranged at two ends of the machine shell.

[0017] In one embodiment, a bearing is respectively arranged on the front end cover and the rear end cover, and the rotating shaft penetrates through the two bearings.

[0018] Compared with the prior art, the present utility model has at least the following advantages:

[0019] 1. The electronic speed control board, the Hall sensor and the magnetic ring are located in the area formed by the rear end cover and the cover plate, while the stator member and the rotor member are located in the area formed by the rear end cover and the front end cover. The above two areas are separated by the rear end cover into independent states. Therefore, compared with the existing structure in which the electronic speed control board and the stator member are located in the same area, when the electronic speed control board, the Hall sensor, the magnetic ring, etc. need to be replaced and repaired in the brushless motor with an external magnetic ring of the present application, it is not necessary to affect the inside of the stator member, and only the cover plate needs to be removed. Therefore, it is convenient for disassembly and assembly.

[0020] 2. Secondly, the electronic speed control board does not need to occupy the space of the stator member. Therefore, its induction area is larger, so that the induction accuracy and control efficiency of the motor can be improved. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1 Structural schematic diagram of a brushless motor with an external magnetic ring according to an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 Cross-sectional structural schematic diagram of the brushless motor with an external magnetic ring shown;

[0024] Figure 3 Cross-sectional structural schematic diagram of a rotor assembly according to an embodiment of the present utility model;

[0025] Figure 4 is Figure 3 Partial enlarged structural schematic diagram of A of

[0026] Figure 5 is Figure 3 Exploded structural schematic diagram of the rotor assembly shown.

[0027] Explanation of reference numerals:

[0028] 10. Brushless motor with an external magnetic ring; 100. Stator assembly; 200. Rotor assembly; 300. Detection assembly; 110. Front end cover; 120. Stator part; 130. Rear end cover; 210. Rotating shaft; 220. Rotor part; 230. Assembly round table; 310. Electronic speed controller board; 320. Magnetic ring; 330. Cover plate; 340. Hall sensor; 231. Circular ring groove; 211. Step groove; 240. Rib; 221. Rotor core; 222. End plate; 223. Magnetic steel block; 2211. Magnetic hole; 121. Machine shell; 122. Stator coil; 140. Bearing. Specific embodiments

[0029] The following will describe in detail the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the embodiments of the present utility model, and should not be construed as a limitation of the present utility model.

[0030] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present utility model and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0032] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0033] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings.

[0034] Such as Figure 1 And Figure 2As shown in the figure, a brushless motor 10 with an external magnetic ring includes a stator assembly 100, a rotor assembly 200 and a detection assembly 300. The stator assembly 100 includes a front end cover 110, a stator member 120 and a rear end cover 130. The front end cover 110 and the rear end cover 130 are respectively arranged at both ends of the stator member 120. The rotor assembly 200 includes a rotating shaft 210 and a rotor member 220. The rotor member 220 is coaxially arranged on the rotating shaft 210. The rotating shaft 210 is rotatably connected to the front end cover 110 and the rear end cover 130, and the rotor member 220 is located inside the stator member 120. Both ends of the rotating shaft 210 penetrate through the front end cover 110 and the rear end cover 130 respectively, and an assembly round table 230 is arranged at one end of the rotating shaft 210 close to the rear end cover 130. The detection assembly 300 includes an electronic speed controller board 310, a magnetic ring 320 and a cover plate 330. The magnetic ring 320 is sleeved on the assembly round table 230. The electronic speed controller board 310 is arranged on the side surface of the rear end cover 130 away from the stator member 120. A Hall sensor 340 is arranged on the electronic speed controller board 310, and the Hall sensor 340 is aligned with the magnetic ring 320. The cover plate 330 is arranged on the side surface of the rear end cover 130 close to the electronic speed controller board 310. The cover plate 330 is used to shield the electronic speed controller board 310.

[0035] It should be noted that the front end cover 110 and the rear end cover 130 are both fixedly locked to both ends of the stator member 120 by screws. The rotating shaft 210 passes through the front end cover 110 and the rear end cover 130, and both ends of the rotating shaft 210 extend out from the front end cover 110 and the rear end cover 130 respectively. The stator member 120 is coaxially installed on the rotating shaft 210, and the stator member 120 is located within the stator member 120. In this way, a rotating magnetic field is generated on the stator member 120 to drive the rotor member 220 and the rotating shaft 210 to rotate. Further, an assembly round table 230 is provided at the end of the rotating shaft 210 that extends out from the rear end cover 130, and the magnetic ring 320 is fixedly adhered to the assembly round table 230 by glue, and the magnetic ring 320 and the assembly round table 230 are coaxially installed. The electronic speed controller board 310 is installed on the end face of the rear end cover 130 away from the stator member 120 by screws. The electronic speed controller board 310 is a pcb board, and a Hall sensor 340 is welded and installed thereon. Moreover, the Hall sensor 340 is aligned with the magnetic ring 320, and there is a gap between the Hall sensor 340 and the magnetic ring 320. The cover plate 330 is installed on the end face of the rear end cover 130 away from the stator member 120 by screws. In this way, the electronic speed controller board 310, the Hall sensor 340, and the magnetic ring 320 are located in the area formed by the rear end cover 130 and the cover plate 330, while the stator member 120 and the rotor member 220 are located in the area formed by the rear end cover 130 and the front end cover 110. The above two areas are separated by the rear end cover 130 into independent states. Therefore, compared with the existing structure where the electronic speed controller board 310 and the stator member 120 are located in the same area, for the externally-mounted magnetic ring brushless motor 10 of the present application, when it is necessary to replace and repair the electronic speed controller board 310, the Hall sensor 340, the magnetic ring 320, etc., it is not necessary to affect the inside of the stator member 120, and only the cover plate 330 needs to be removed. Therefore, it is convenient for disassembly and assembly. Secondly, the electronic speed controller board 310 does not need to occupy the space of the stator member 120, so its induction area is larger, thereby improving the induction accuracy and control efficiency of the motor.

[0036] As Figure 3 and Figure 4 shown, in an embodiment, a circular ring groove 231 is provided at one end of the assembly round table 230 close to the rotating shaft 210, and the circular ring groove 231 is used for filling glue.

[0037] It should be noted that the magnetic ring 320 is fixedly adhered to the assembly round table 230 by glue. By providing a circular ring groove 231 at the root of the assembly round table 230, that is, at the position where it is connected to the rotating shaft 210, the glue can be filled in the circular ring groove 231, thereby ensuring that the magnetic ring 320 is reliably fixed to the assembly round table 230.

[0038] As Figure 3 and Figure 5 shown, in an embodiment, a stepped groove 211 is provided at one end of the rotating shaft 210 away from the assembly round table 230.

[0039] It should be noted that by using the stepped groove 211, it is convenient to fix the rotating shaft 210 and the load, and prevent the load from rotating relative to the rotating shaft 210.

[0040] As Figure 5 shown, in one embodiment, a plurality of rib strips 240 distributed along the axial direction are further provided on the outer side wall of the rotating shaft 210.

[0041] It should be noted that by providing the rib strips 240, the rotor member 220 and the rotating shaft 210 are reliably fixed. In one embodiment, the rib strips 240 are formed by rolling with a knurling tool.

[0042] As Figure 3 and Figure 5 shown, in one embodiment, the rotor member 220 includes a rotor core 221, two end plates 222 and a plurality of magnet blocks 223. The rotating shaft 210 coaxially penetrates through the rotor core 221. The two end plates 222 are both sleeved on the rotating shaft 210, and the two end plates 222 respectively abut against the two ends of the rotor core 221. Each magnet block 223 is respectively arranged on the rotor core 221 at equal angles.

[0043] It should be noted that a perforation is provided on the axis of the rotor core 221, and the rotating shaft 210 passes through the perforation. The rotating shaft 210 and the rotor core 221 are adaptively installed, and the rotor core 221 and the rotating shaft 210 are fixed by glue. Each magnet block 223 is installed at intervals on the rotor core 221. The two end plates 222 are sleeved on both ends of the rotating shaft 210, and the two end plates 222 respectively abut against the two ends of the rotor core 221. In one embodiment, the end plates 222 and the rotating shaft 210 are also fixed by glue. In this way, a stable rotor member 220 is formed.

[0044] As Figure 5 shown, in one embodiment, a plurality of magnetic holes 2211 are provided on the rotor core 221, and each magnet block 223 is respectively inserted into each magnetic hole 2211.

[0045] It should be noted that a plurality of magnetic holes 2211 are provided around the rotating shaft 210 on the rotor core 221. In one embodiment, four magnetic holes 2211 are provided, and the four magnetic holes 2211 are distributed at equal angles relative to the rotating shaft 210. Each magnet block 223 is respectively installed in each magnetic hole 2211. In this way, it is ensured that the magnet block 223 and the rotor core 221 are reliably fixed. Correspondingly, in one embodiment, four magnet blocks 223 are provided, and the four magnet blocks 223 are distributed at equal angles in a circle relative to the axis of the rotor core 221.

[0046] As Figure 1 and Figure 2As shown, in one embodiment, the stator member 120 includes a housing 121 and a stator coil 122. The stator coil 122 is disposed on the inner sidewall of the housing 121, and the front end cover 110 and the rear end cover 130 are respectively disposed at both ends of the housing 121.

[0047] It should be noted that the stator coil 122 is fixedly installed on the inner sidewall of the housing 121, and then the front end cover 110 and the rear end cover 130 are installed on both ends of the housing 121 by screws.

[0048] As Figure 1 and Figure 2 shown, in one embodiment, the front end cover 110 and the rear end cover 130 are respectively provided with a bearing 140, and the rotating shaft 210 passes through the two bearings 140. In this way, the rotating shaft 210 is rotatably connected to the front end cover 110 and the rear end cover 130 through the bearings 140, ensuring that the rotating shaft 210 can rotate stably relative to the stator assembly 100.

[0049] The above-described embodiments merely represent several embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A brushless motor with an external magnetic ring, characterized in that: include: A stator assembly, the stator assembly comprising a stator component, a front end cover and a rear end cover, the front end cover and the rear end cover are respectively arranged at two ends of the stator component; A rotor assembly, the rotor assembly comprising a rotating shaft and a rotor member, the rotor member being coaxially arranged on the rotating shaft, the rotating shaft being rotatably connected to the front end cover and the rear end cover, and the rotor member being located inside the stator member, the two ends of the rotating shaft respectively passing through the front end cover and the rear end cover, and an assembly round table being arranged at one end of the rotating shaft close to the rear end cover; and The detection component includes an electric adjustment plate, a magnetic ring and a cover plate, the magnetic ring is sleeved on the assembly round table, the electric adjustment plate is arranged on a side surface of the rear end cover away from the stator component, a Hall sensor is arranged on the electric adjustment plate, and the Hall sensor is aligned with the magnetic ring, the cover plate is arranged on a side surface of the rear end cover close to the electric adjustment plate, and the cover plate is used to shield the electric adjustment plate.

2. The brushless motor with external magnetic ring according to claim 1, characterized in that: An annular groove is provided on one end of the assembly truncated cone close to the rotating shaft, and the annular groove is used for filling with glue.

3. The brushless motor with external magnetic ring according to claim 1, characterized in that: A step groove is provided on one end of the rotating shaft away from the assembly truncated table.

4. The brushless motor with external magnetic ring according to claim 3, characterized in that: A plurality of ribs distributed along the axial direction are also arranged on the outer side wall of the rotating shaft.

5. The brushless motor with external magnetic ring according to claim 4, characterized in that: The rotor component includes a rotor core, two end plates and a plurality of magnetic steel blocks. The rotating shaft is coaxially inserted into the rotor core. The two end plates are both sleeved on the rotating shaft, and the two end plates are respectively abutted against the two ends of the rotor core. The magnetic steel blocks are respectively arranged on the rotor core at equal angles.

6. The brushless motor with external magnetic ring according to claim 5, characterized in that: A plurality of magnetic holes are provided on the rotor core, and each magnetic steel block is inserted into each magnetic hole respectively.

7. The brushless motor with external magnetic ring according to claim 6, characterized in that: There are four magnetic steel blocks, and the four magnetic steel blocks are distributed at equal angles around the circumference relative to the axis of the rotor core.

8. The brushless motor with external magnetic ring according to claim 1, characterized in that: The stator component comprises a casing and a stator coil, wherein the stator coil is arranged on the inner side wall of the casing, and the front end cover and the rear end cover are respectively arranged at two ends of the casing.

9. The brushless motor with external magnetic ring according to claim 1, characterized in that: The front end cover and the rear end cover are respectively provided with a bearing, and the rotating shaft passes through the two bearings.

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