Rotor position sensing device and motor equipment
By vertically setting the Hall device on the end face of the induction magnet and utilizing the avoidance slot design, the problems of large space occupation and high cost of Hall sensors are solved, realizing a compact design and cost reduction for motor equipment.
Patent Information
- Application Number
- CN202423282676.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Traditional Hall sensor designs for permanent magnet motors are space-consuming, costly, and not compact enough, which poses problems, especially in space-constrained applications.
The Hall effect device is placed on the vertical surface of the end face of the induction magnet. The Hall sensor assembly cooperates with the induction magnet through the avoidance slot to achieve a non-parallel arrangement, reducing space occupation and simplifying the layout location restrictions.
It reduces manufacturing costs, minimizes space occupation, improves structural compactness, and adapts to more applications with limited space.
Smart Images
Figure CN223713772U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor measurement technical field especially relates to rotor position sensing device and motor equipment. BACKGROUND
[0002] Motor equipment usually adopts measuring device to measure, identify and control rotor position or rotating speed when measuring.
[0003] At present, traditional permanent magnet motor equipment usually adopts two switch hall sensors to detect motor rotor angle, and generally adopts external driving circuit to control the operation of permanent magnet motor equipment. However, the above-mentioned design of external driving circuit still needs to increase hall induction circuit board, motor winding and wire harness of hall signal and installation shell of external driving circuit, which not only has high manufacturing cost, but also has problems of large space occupation and insufficient compact structure for some application occasions. SUMMARY
[0004] The utility model discloses a rotor position sensing device and motor equipment, and hall device can be arranged on the vertical surface of the end surface of inductive magnet steel, which eliminates the space and process limitation that hall sensor assembly can only be arranged parallel to the end surface of inductive magnet steel, and reduces the manufacturing cost.
[0005] To achieve the purpose, the utility model adopts the following technical scheme:
[0006] The rotor position sensing device comprises:
[0007] The rotor assembly comprises a rotating shaft unit and an inductive magnet steel, and the inductive magnet steel is coaxially connected to one end of the rotating shaft unit.
[0008] The stator assembly can rotate relative to the rotor assembly around the axis of the rotating shaft unit, and the stator assembly comprises a hall sensor assembly, the hall sensor assembly comprises at least one hall device, and the hall device is arranged on the vertical surface of the end surface of the inductive magnet steel.
[0009] As a preferred technical scheme of the rotor position sensing device, the number of the hall device is 2.
[0010] As a preferred technical solution for the rotor position sensing device, the Hall sensor assembly includes a Hall sensor circuit board; the plane on which the Hall sensor circuit board is located is perpendicular to the end face of the sensing magnet; two Hall devices are communicatively connected to the Hall sensor circuit board and fixed on the Hall sensor circuit board.
[0011] As a preferred technical solution for the rotor position sensing device, one end of the Hall sensor assembly is the working end, the Hall device is fixed to the working end, the working end is recessed with a clearance groove, and the sensing magnet passes through the clearance groove.
[0012] As a preferred technical solution for the rotor position sensing device, the depth direction of the clearance slot is the same as the length direction of the Hall sensor assembly, and the two Hall devices are symmetrically arranged about the clearance slot.
[0013] As a preferred technical solution for the rotor position sensing device, the Hall sensor assembly includes two Hall sensor circuit boards; the plane on which the Hall sensor circuit board is located is perpendicular to the end face of the sensing magnet; the two Hall devices are respectively connected to one of the Hall sensor circuit boards and are respectively fixed on the corresponding connected Hall sensor circuit boards.
[0014] As a preferred technical solution for the rotor position sensing device, the number of Hall devices is 3, and the 3 Hall devices are arranged on the same vertical plane of the sensing magnet, or the 3 Hall devices are arranged on different vertical planes of the sensing magnet.
[0015] As a preferred technical solution for the rotor position sensing device, the rotor assembly further includes a magnetic ring, which is coaxially sleeved on the rotating shaft unit.
[0016] The motor equipment includes the rotor position sensing device described above. The stator assembly further includes a mirror tube, and the rotor assembly further includes a shaft top cover. The mirror tube forms a receiving cavity. The Hall sensor assembly is fixedly installed in the receiving cavity. The rotor assembly extends into the receiving cavity, and the shaft top cover is fixed to the other end of the rotating shaft unit.
[0017] As a preferred technical solution for motor equipment, the shaft unit includes a shaft bolt and a shaft nut, the induction magnet is sleeved on the head of the shaft bolt, and the bolt of the shaft bolt passes through the shaft top cover and is screwed to the shaft nut.
[0018] The beneficial effects of this utility model are:
[0019] The rotor position sensing device includes: a rotor assembly, comprising a shaft unit and a sensing magnet, the sensing magnet being coaxially sleeved at one end of the shaft unit; and a stator assembly, the rotor assembly being rotatable relative to the stator assembly about the axis of the shaft unit, the stator assembly including a Hall sensor assembly, the Hall sensor assembly including at least one Hall device disposed on a vertical surface of the end face of the sensing magnet. When the rotor assembly rotates relative to the stator assembly, the sensing magnet and the Hall device rotate relative to each other, causing the Hall device to sense the angle of rotor rotation through changes in the magnetic field, allowing the Hall sensor assembly to accurately sense the rotor's rotational position information, thus achieving the purpose of rotor position sensing. The Hall effect sensor of the rotor position sensing device provided by this utility model can be set on the vertical surface of the end face of the sensing magnet, which removes the space and process restrictions that the Hall sensor assembly can only be set parallel to the end face of the sensing magnet. This improvement reduces the restrictions on the placement of the Hall sensor assembly in the stator assembly by limiting the relative position relationship between the Hall effect sensor and the sensing magnet, thereby enabling the adjustment of the relative position relationship between the Hall sensor assembly and the sensing magnet. The above improvements reduce the space occupied by the rotor position sensing device and relax the manufacturing restrictions on the rotor position sensing device. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the rotor position sensing device provided in an embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram showing the positional relationship between the inductive magnet and the Hall device provided in this embodiment of the utility model;
[0022] Figure 3 This is an exploded view of the motor equipment provided in this embodiment of the utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the Hall sensor assembly provided in this embodiment of the utility model;
[0024] Figure 5 This is a cross-sectional view of the motor device provided in an embodiment of this utility model.
[0025] In the picture:
[0026] 100. Hall sensor assembly; 110. Hall sensor circuit board; 111. Clearance slot; 120. Hall device; 200. Induction magnet; 300. Magnetic ring; 410. Shaft bolt; 420. Shaft nut; 500. Coil; 610. First bearing; 620. Second bearing; 700. Ring-shaped component; 800. Shaft top cover; 900. Lens barrel. Detailed Implementation
[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.
[0030] 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.
[0031] like Figures 1 to 5As shown, this embodiment provides a rotor position sensing device, including a rotor assembly and a stator assembly. The rotor assembly includes a shaft unit and an induction magnet 200, with the induction magnet 200 coaxially sleeved at one end of the shaft unit. The rotor assembly can rotate relative to the stator assembly around the axis of the shaft unit. The stator assembly includes a Hall sensor assembly 100, which includes at least one Hall device 120 disposed on a vertical surface of the end face of the induction magnet 200. When the rotor assembly rotates relative to the stator assembly, the induction magnet 200 and the Hall device 120 rotate relative to each other, causing the Hall device 120 to sense the angle of rotor rotation through changes in the magnetic field. This allows the Hall sensor assembly 100 to accurately sense the rotor's rotational position information, achieving the purpose of rotor position sensing. The rotor position sensing device provided by this utility model has a Hall device 120 disposed on the vertical surface of the end face of the induction magnet 200, which removes the space and process restrictions that the Hall sensor assembly 100 can only be arranged parallel to the end face of the induction magnet 200. This improvement reduces the restriction on the placement of the Hall sensor assembly 100 in the stator assembly by limiting the relative positional relationship between the Hall device 120 and the induction magnet 200, thereby enabling the adjustment of the relative positional relationship between the Hall sensor assembly 100 and the induction magnet 200. The above improvements reduce the space occupied by the rotor position sensing device and relax the manufacturing restrictions on the rotor position sensing device.
[0032] In this embodiment, the number of Hall devices 120 is 2. As a preferred embodiment, such as... Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the Hall sensor assembly 100 includes a Hall sensor circuit board 110; the plane of the Hall sensor circuit board 110 is perpendicular to the end face of the inductive magnet 200; two Hall devices 120 are communicatively connected to the Hall sensor circuit board 110 and fixed on the Hall sensor circuit board 110. In one embodiment, as... Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, one end of the Hall sensor assembly 100 is the working end, and the Hall device 120 is fixed to the working end. The working end has a recessed clearance slot 111 through which the sensing magnet 200 passes. By setting the clearance slot 111, this rotor position sensing device enables the Hall sensor assembly 100 to avoid positional conflicts with the sensing magnet 200. This avoids positional conflicts between the rotor assembly and the stator assembly and also limits the placement of the sensing magnet 200, ensuring that the two Hall devices 120 are positioned on opposite sides of the sensing magnet 200. When the rotor assembly rotates relative to the stator assembly, the sensing magnet 200 and the Hall sensor circuit board 110 rotate relative to each other, causing the Hall device 120 to sense the rotor's rotation angle through changes in the magnetic field. This allows the Hall sensor circuit board 110 to accurately sense the rotor's rotational position information, achieving the purpose of rotor position sensing. The above improvements reduce the restrictions on the placement of the Hall sensor circuit board 110 in the stator assembly by limiting the relative positional relationship between the Hall device 120 and the induction magnet 200. This allows for adjustment of the relative positional relationship between the Hall sensor circuit board 110 and the induction magnet 200. These improvements reduce the space occupied by the rotor position sensing device and relax the manufacturing restrictions on the rotor position sensing device.
[0033] In this embodiment, the plane containing the Hall sensor circuit board 110 is perpendicular to the end face of the sensing magnet 200. For example, as shown... Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the two Hall devices 120 are symmetrical about the axis of the rotating shaft unit. By defining the relative positional relationship between the plane where the Hall sensor circuit board 110 is located and the axis of the rotating shaft unit, the relative positional relationship between the Hall sensor circuit board 110 and the rotating shaft unit can be planned, thereby further simplifying the structural layout of the rotor assembly and the stator assembly and reducing the space occupied by the rotor position sensing device.
[0034] For example, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the depth direction of the clearance slot 111 is the same as the length direction of the Hall sensor assembly 100, and the two Hall devices 120 are symmetrically arranged about the clearance slot 111. By limiting the relationship between the depth direction of the clearance slot 111 and the length direction of the Hall sensor assembly 100, the arrangement of the clearance slot 111 can be limited, thereby minimizing the size of the clearance slot 111. This reduces the space occupied by the clearance slot 111 on the Hall sensor assembly 100, which helps to reduce the volume of the Hall sensor assembly 100 and the space occupied by the stator assembly.
[0035] In another embodiment, the number of Hall devices 120 is two; the Hall sensor assembly 100 includes two Hall sensor circuit boards 110; the two Hall sensor circuit boards 110 are arranged in parallel, and the plane on which the two Hall sensor circuit boards 110 are located is perpendicular to the end face of the induction magnet 200; the two Hall devices 120 are respectively communicatively connected to one Hall sensor circuit board 110 and are respectively fixed on the corresponding communicatively connected Hall sensor circuit board 110. In this embodiment, the two Hall devices 120 can be respectively disposed on two circuit boards.
[0036] In another embodiment, the number of Hall devices 120 is 3. The three Hall devices 120 are disposed on the same vertical plane of the inductive magnet 200. Exemplarily, the three Hall devices 120 are fixed on the same Hall sensor circuit board 110. Alternatively, the three Hall devices 120 can be disposed on different vertical planes of the inductive magnet 200. Exemplarily, the Hall sensor assembly 100 includes two Hall sensor circuit boards 110. The two Hall sensor circuit boards 110 are arranged in parallel, with two Hall devices 120 fixed on the same Hall sensor circuit board 110 and one fixed on the other Hall sensor circuit board 110.
[0037] In this embodiment, the rotor assembly also includes a magnetic ring 300, which is coaxially sleeved on the shaft unit. As a structure on the rotor position sensing device, the magnetic ring 300 ensures the smooth operation of the rotor position sensing device. By limiting the relative position between the magnetic ring 300 and the shaft unit, the magnetic ring 300 can be ensured to work stably, thereby ensuring the long-term stable operation of the rotor position sensing device.
[0038] The purpose and working principle of the magnetic ring 300 in the rotor position sensing device are common knowledge in the field and are well known to those skilled in the art, so they will not be elaborated here.
[0039] This embodiment also provides a motor device, including the rotor position sensing device described above. The stator assembly also includes a mirror tube 900, and the rotor assembly also includes a shaft top cover 800. The mirror tube 900 forms a receiving cavity, and the Hall sensor assembly 100 is fixedly installed in the receiving cavity. Part of the rotor assembly extends into the receiving cavity, and the shaft top cover 800 is fixedly connected to the other end of the rotating shaft unit.
[0040] By incorporating a mirror tube 900 and a shaft top cover 800, this motor equipment achieves structural protection for the stator and rotor assemblies on the rotor position sensing device. This reduces the probability of damage to the rotor position sensing device, avoids accidental positional shifts in the stator and rotor assemblies, lowers the maintenance frequency, ensures smooth transmission between the stator and rotor assemblies, contributes to the stable operation of the rotor position sensing device, and guarantees the long-term stable operation of the motor equipment.
[0041] Specifically, the Hall sensor circuit board 110 is embedded in the inner wall of the lens barrel 900, and the edge of the Hall sensor circuit board 110 is closely fitted with the cavity wall of the accommodating cavity.
[0042] In this embodiment, the lens barrel 900 has a mating hole, through which the accommodating cavity communicates with the outside. The motor also includes a bearing, the inner ring of which is fitted onto the outer wall of the rotating shaft unit, and the outer ring of which is tightly fitted with the wall of the mating hole. This design, utilizing a bearing to achieve rotational engagement between the rotating shaft unit and the mating hole, allows the rotor assembly to rotate relative to the stator assembly around the axis of the rotating shaft unit. This design is simple and reliable, provides good transmission performance and high stability, ensuring the stable operation of both the rotor and stator assemblies, guaranteeing the smooth operation of the rotor position sensing device, and ensuring the long-term stable operation of the motor.
[0043] In this embodiment, the shaft unit includes a shaft bolt 410 and a shaft nut 420. An induction magnet 200 is fitted onto the threaded head of the shaft bolt 410, and the threaded shaft of the shaft bolt 410 passes through the shaft top cover 800 and is screwed onto the shaft nut 420. Specifically, the shaft bolt 410 is made of steel, and the first bearing 610, the annular member 700, and the second bearing 620 are all fitted onto the threaded shaft of the shaft bolt 410. The separate design of the shaft bolt 410 and the shaft nut 420 reduces the production cost of the shaft unit, simplifies the connection between the shaft unit and the shaft top cover 800, improves the manufacturing efficiency of the rotor assembly, and ensures the smooth production of the motor equipment.
[0044] Furthermore, two bearings are provided: a first bearing 610 and a second bearing 620. The motor also includes an annular component 700. The first bearing 610, the annular component 700, and the second bearing 620 are sequentially sleeved on the rotating shaft unit, with the annular component 700 spaced apart from the wall of the mating hole. Specifically, the annular component 700 is a copper ring. By setting the first bearing 610, the annular component 700, and the second bearing 620, rotational engagement between the rotating shaft unit and the mirror barrel 900 is achieved. This design is simple and reliable, with high connection stability and good transmission effect, ensuring smooth relative rotation between the stator assembly and the rotor assembly, and guaranteeing the long-term stable operation of the motor.
[0045] In this embodiment, the stator assembly also includes a coil 500, which is fixedly mounted on the mirror barrel 900, and the axis of the coil 500 coincides with the axis of the mating hole. As a structure on the motor equipment, the coil 500 ensures the smooth operation of the motor equipment. By limiting the relative position between the coil 500 and the rotor assembly, the coil 500 can be guaranteed to work stably, thereby ensuring the long-term stable operation of the motor equipment.
[0046] The purpose and working principle of coil 500 in motor equipment are common knowledge in the field and are well known to those skilled in the art, so they will not be elaborated here.
[0047] Furthermore, an annular groove is provided on the outer wall of the lens barrel 900, with the axis of the annular groove coinciding with the axis of the mating hole. The coil 500 is embedded in the annular groove. The annular groove ensures stable installation of the coil 500 on the lens barrel 900, and the alignment of the annular groove's axis with the mating hole's axis guarantees accurate installation of the coil 500, ensuring smooth operation of the motor equipment. This design is simple and reliable, ensuring the installation stability of the coil 500, reducing the risk of the coil 500 accidentally detaching from the annular groove, and guaranteeing the long-term stable operation of the stator assembly.
[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A rotor position sensing device, characterized in that, The rotor position sensing device includes: The rotor assembly includes a shaft unit and an induction magnet (200), wherein the induction magnet (200) is coaxially sleeved on one end of the shaft unit; The stator assembly and the rotor assembly are rotatable relative to the stator assembly about the axis of the rotating shaft unit. The stator assembly includes a Hall sensor assembly (100), which includes at least one Hall device (120) disposed on the vertical surface of the end face of the induction magnet (200).
2. The rotor position sensing device according to claim 1, characterized in that, The number of Hall devices (120) is 2.
3. The rotor position sensing device according to claim 2, characterized in that, The Hall sensor assembly (100) includes a Hall sensor circuit board (110); the plane of the Hall sensor circuit board (110) is perpendicular to the end face of the inductive magnet (200); two Hall devices (120) are communicatively connected to the Hall sensor circuit board (110) and fixed on the Hall sensor circuit board (110).
4. The rotor position sensing device according to claim 3, characterized in that, One end of the Hall sensor assembly (100) is the working end, the Hall device (120) is fixed to the working end, the working end is recessed with a clearance groove (111), and the induction magnet (200) passes through the clearance groove (111).
5. The rotor position sensing device according to claim 4, characterized in that, The depth direction of the clearance slot (111) is the same as the length direction of the Hall sensor assembly (100), and the two Hall devices (120) are arranged symmetrically about the clearance slot (111).
6. The rotor position sensing device according to claim 2, characterized in that, The Hall sensor assembly (100) includes two Hall sensor circuit boards (110); the plane of the Hall sensor circuit board (110) is perpendicular to the end face of the induction magnet (200); the two Hall devices (120) are respectively connected to one of the Hall sensor circuit boards (110) and are respectively fixed on the corresponding connected Hall sensor circuit board (110).
7. The rotor position sensing device according to claim 1, characterized in that, The number of Hall devices (120) is 3. The three Hall devices (120) are arranged on the same vertical plane of the inductive magnet (200), or the three Hall devices (120) are arranged on different vertical planes of the inductive magnet (200).
8. The rotor position sensing device according to claim 1, characterized in that, The rotor assembly also includes a magnetic ring (300), which is coaxially sleeved on the shaft unit.
9. An electric motor device, characterized in that, The rotor position sensing device includes any one of claims 1-8, wherein the stator assembly further includes a mirror tube (900), the rotor assembly further includes a shaft top cover (800), the mirror tube (900) forms a receiving cavity, the Hall sensor assembly (100) is fixedly installed in the receiving cavity, the rotor assembly partially extends into the receiving cavity, and the shaft top cover (800) is fixedly connected to the other end of the rotating shaft unit.
10. The motor device according to claim 9, characterized in that, The rotating shaft unit includes a rotating shaft bolt (410) and a rotating shaft nut (420). The induction magnet (200) is sleeved on the head of the rotating shaft bolt (410). The screw of the rotating shaft bolt (410) passes through the shaft top cover (800) and is screwed to the rotating shaft nut (420).