A compact hall reduction motor
Patent Information
- Application Number
- CN202522563299.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-02
AI Technical Summary
结构不紧凑：传统的霍尔传感组件占用额外的轴向或径向空间，不利于电机的小型化；传感可靠性差：霍尔元件与磁环之间的距离在装配中易产生公差累积，可能导致气隙过大而感应失效，或气隙过小而有摩擦风险，影响电机可靠性；生产成本高：电机壳体多为压铸件，若进料口设置在内部，产生的飞边毛刺会影响关键装配面的精度，必须进行后续车加工，增加了单机成本和工序时间
[0012]作为本实用新型的进一步改进，箱体、箱盖和后端盖两端均设有若干互相匹配的螺孔，箱体、箱盖和后端盖通过螺钉相互固定连接，所述螺钉外面套有热缩管，电机在逆时针旋转时功率比较大，导致电机振动增大，从而会导致螺钉和螺钉孔之间发生细微高频碰撞产生螺钉异音，电机工作后产生的热能使得热缩管收缩，以消除螺钉产生的异常噪音。
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Figure CN224923573U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of Hall motor technology, and more specifically, relates to a compact Hall geared motor. Background Technology
[0002] Hall effect geared motors are widely used in automation equipment, smart homes, and other fields. However, with increasing demands for product miniaturization and cost control, existing Hall effect geared motors have revealed the following shortcomings: Non-compact structure: Traditional Hall sensor components occupy additional axial or radial space, which is not conducive to the miniaturization of motors; Poor sensing reliability: The distance between the Hall element and the magnetic ring is prone to tolerance accumulation during assembly, which may lead to excessive air gap and sensing failure, or excessive air gap and friction risk, affecting motor reliability; High production cost: The motor housing is mostly die-cast. If the feed port is set inside, the resulting burrs will affect the accuracy of critical assembly surfaces, requiring subsequent machining, which increases the unit cost and process time.
[0003] Therefore, there is a need for a Hall motor that is compact, has high sensing reliability, and reduces production costs. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a compact Hall geared motor that can meet the requirements of compact structure, high sensing reliability and reduced production cost of Hall motor.
[0005] This utility model discloses a compact Hall effect geared motor, comprising a housing, a housing cover, a rear end cover, a stator assembly, a rotor assembly, a gear assembly, and a Hall sensor. The housing cover and the rear end cover are respectively fixedly connected to the axial ends of the housing. The stator assembly is fixed inside the housing. The rotor assembly is supported on the housing and the rear end cover by bearings and can rotate freely inside the stator assembly. The gear assembly is installed inside the housing cover. The rotor assembly includes a rotor, a rotor shaft fixedly connected inside the rotor, and a fan blade fixed to one end of the rotor shaft. An input gear is provided at the other end of the rotor shaft. The input gear at the upper end of the rotor shaft extends into the gear assembly and is connected to the reduction gear set inside the gear assembly. The Hall sensor includes a PCB circuit board and a Hall magnetic ring. The PCB circuit board is fixedly connected to the end face of the rear end cover. The Hall magnetic ring is a cylindrical permanent magnet and is fixedly embedded in the end face of the fan blade facing the rear end cover.
[0006] As a further improvement of this utility model, the box body and the rear end cover are manufactured by a one-time die-casting aluminum casting process. Two protruding aluminum casting inlets are cast on the outer circumferential wall of the box body and the outer circumferential wall of the rear end cover, respectively. The aluminum casting inlets are set on the outer wall of the stop structure formed after the box body and the rear end cover are assembled, so that the flash and burrs generated during the die-casting process will not affect the surface quality. Therefore, the box body, the box cover and the rear end cover can be used for assembly without any machining after the die-casting demolding, which greatly reduces the production cost.
[0007] As a further improvement of this utility model, the stator assembly includes a stator core and a stator winding. The stator core is provided with an insulating groove, and the stator winding is fixedly embedded in the insulating groove. The groove wedge is fixedly pressed against the opening of the insulating groove to seal the stator winding, thereby improving the anti-loosening performance and enhancing the overall stability.
[0008] As a further improvement of this utility model, a cast counterweight is fixedly installed on the other side of the fan blade, which is 180° symmetrical to the position where the Hall magnetic ring is installed. The counterweight balances the extra mass generated by the installation of the Hall magnetic ring, so that the entire rotor assembly has good dynamic balance performance when rotating at high speed without the need for subsequent correction.
[0009] As a further improvement of this utility model, the gear assembly includes a combination gear and an output shaft gear. A gear chamber is provided inside the housing cover. Both the combination gear and the output shaft gear are rotatably mounted in the gear chamber inside the housing cover via bearings. The upper shaft section of the output shaft gear extends out from the bearing hole on the housing cover as the final output shaft. The combination gear is a gear set composed of two coaxially rotating gears. The combination gear meshes with the input gear and the output shaft gear at the upper end of the rotor shaft, respectively, to form a multi-stage reduction transmission.
[0010] As a further improvement of this utility model, the gear chamber of the combined gear is designed to be recessed, and a recessed groove structure is set at the bottom of the gear chamber to accommodate the combined gear. That is, the height of the gear chamber where the combined gear is located is lower than the gear chamber where the output shaft gear is located, which effectively reduces the transmission center height of the gear set. The recessed structure of the gear chamber where the combined gear is located ensures the transmission strength while realizing the reduction of the axial dimension of the gear assembly, thereby forming a compact geared motor together with the motor body.
[0011] As a further improvement of this utility model, the inner side of the rear end cover is provided with a positioning boss for mounting the PCB circuit board. The height of the positioning boss is configured such that when the PCB circuit board is mounted on it, the axial sensing distance between the working surface of the Hall magnetic ring and the Hall element on the PCB circuit board is no more than 5mm, ensuring the effectiveness of the Hall signal and providing a guarantee for the precise commutation and speed regulation of the motor.
[0012] As a further improvement of this utility model, the box body, the box cover and the rear end cover are provided with several matching screw holes at both ends. The box body, the box cover and the rear end cover are fixedly connected to each other by screws. The screws are covered with heat shrink tubing. When the motor rotates counterclockwise, the power is relatively large, which leads to increased motor vibration. This causes a slight high-frequency collision between the screw and the screw hole, resulting in abnormal screw noise. The heat generated after the motor works causes the heat shrink tubing to shrink, thereby eliminating the abnormal noise generated by the screw.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by integrating the Hall magnetic ring into the end face of the fan blade, the independent magnetic ring mounting seat is eliminated, and the sunken design of the gear chamber effectively reduces the transmission center height; the two work together to significantly shorten the overall axial length of the motor and realize miniaturized design. The symmetrically integrated counterweights on the fan blades compensate for the mass eccentricity caused by the installation of the Hall magnetic ring, ensuring that the rotor assembly has good dynamic balance at the factory, eliminating the need for subsequent calibration processes, reducing vibration transmitted to the gearbox, ensuring smooth operation of the reduction mechanism, reducing noise, and extending the overall machine lifespan. By placing the cast aluminum feed port of the housing and rear end cover on the outer wall of the stop structure, the burrs generated by die casting do not affect the precision of key assembly surfaces. The housing can be directly assembled after die casting without machining, eliminating the need for deburring and leveling processes, thus reducing unit cost. The axial sensing distance between the working surface of the Hall magnetic ring and the Hall element on the PCB circuit board is limited to within 5mm, ensuring the effectiveness of the Hall signal and providing a guarantee for the precise commutation and speed regulation of the motor. The screws are covered with heat shrink tubing to eliminate abnormal noise generated by the screws. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the bottom structure of this utility model; Figure 4 This is an exploded structural diagram of the stator assembly of this utility model; Figure 5 This is a schematic diagram of the exploded structure of the rotor assembly and Hall magnetic ring of this utility model; Figure 6 This is an exploded view of the gear assembly and housing cover of this utility model; Figure 7 This is a schematic diagram of the PCB circuit board embedded rear end cover structure of this utility model; Figure 8 For the present utility model Figure 2 An enlarged schematic diagram of region A in the middle.
[0015] Explanation of the labels in the diagram: 1. Housing; 2. Cover; 21. Gear chamber; 3. Rear end cover; 31. Positioning boss; 4. Stator assembly; 41. Stator core; 42. Stator winding; 43. Insulation slot; 44. Slot wedge; 5. Rotor assembly; 51. Rotor shaft; 52. Fan blade; 53. Counterweight; 54. Gear assembly; 6. Combined gear; 61. Output shaft gear; 62. Hall sensor; 7. PCB circuit board; 71. Hall magnetic ring; 72. Cast aluminum feed port; 8. Detailed Implementation
[0016] Specific Implementation Example 1: Please refer to... Figures 1-8 This utility model relates to a compact Hall effect geared motor, comprising a housing 1, a housing cover 2, a rear end cover 3, a stator assembly 4, a rotor assembly 5, a gear assembly 6, and a Hall sensor 7. The housing cover 2 and the rear end cover 3 are respectively fixedly connected to the axial ends of the housing 1. The housing 1, housing cover 2, and rear end cover 3 together form the sealed internal space of the motor. The stator assembly 4 is fixed inside the housing 1 by an interference fit. The rotor assembly 5 is supported on the housing 1 and the rear end cover 3 by bearings. The rotor assembly 5 rotates freely inside the stator assembly 4. The gear assembly 6 is mounted on... The rotor assembly 5, housed inside the cover 2, includes a rotor 51, a rotor shaft 52 fixedly connected inside the rotor 51, and a fan blade 53 fixed to the rear end of the rotor shaft 52. The upper section of the rotor shaft 52 extends into the gear assembly 6 and is connected to the reduction gear set therein. The Hall sensor 7 includes a PCB circuit board 71 and a Hall magnetic ring 72. The PCB circuit board 71 is fixedly connected to the end face of the rear cover 3. The Hall magnetic ring 72 is a cylindrical permanent magnet. The Hall magnetic ring 72 is embedded and fixed on the side end face of the fan blade 53 facing the rear cover 3.
[0017] In a further embodiment, such as Figure 3 As shown, the housing 1 and the rear end cover 3 are manufactured using a one-time die-casting aluminum casting process. Two protruding aluminum inlets 8 are cast on the outer circumferential wall of the housing 1 and the outer circumferential wall of the rear end cover 3, respectively. The aluminum inlets 8 are located on the outer wall of the stop structure formed after the housing 1 and the rear end cover 3 are assembled, so that the flash and burrs generated during the die-casting process will not affect the dimensional accuracy and surface quality of the inner ring of the stop structure. Therefore, the housing 1, the cover 2 and the rear end cover 3 can be used for assembly without any machining after the die-casting is demolded, which greatly reduces the production cost.
[0018] In a further embodiment, such as Figure 4 As shown, the stator assembly 4 includes a stator core 41 and a stator winding 42. The stator core 41 is provided with an insulating groove 43. The stator winding 42 is fixedly embedded in the insulating groove 43. The groove wedge 44 is fixedly pressed against the opening of the insulating groove 43 to seal the stator winding 42, thereby improving the anti-loosening performance and enhancing the overall stability.
[0019] In a further embodiment, such as Figure 5As shown, a cast counterweight 54 is fixedly installed on the other side of the fan blade 53, which is 180° symmetrical to the position where the Hall magnetic ring 72 is installed. The counterweight 54 balances the extra mass generated by the installation of the Hall magnetic ring 72, so that the entire rotor assembly 5 has good dynamic balance performance when rotating at high speed without the need for subsequent correction.
[0020] In a further embodiment, such as Figure 6 As shown, the gear assembly 6 includes a combination gear 61 and an output shaft gear 62. A gear chamber 21 is provided inside the housing cover 2. Both the combination gear 61 and the output shaft gear 62 are rotatably mounted in the gear chamber 21 inside the housing cover 2 via bearings. The upper shaft section of the output shaft gear 62 extends out of the housing through the bearing hole on the gearbox housing as the final output shaft. The combination gear 61 is a gear set consisting of two gears that rotate coaxially. The combination gear 61 meshes with the input gear of the rotor shaft 52 and the final output shaft gear 62, forming a multi-stage reduction transmission. The gear chamber 21 of the combination gear 61 is designed to be recessed. A recessed groove structure is provided at the bottom of the gear chamber 21 to accommodate the combination gear 61. That is, the horizontal height of the combination gear 61 is lower than that of the output shaft gear 62, which effectively reduces the transmission center height of the gear assembly 6. The recessed structure of the gear chamber 21 where the combination gear 61 is located achieves a reduction in the axial dimension of the gear assembly 6 while ensuring the transmission strength, thus forming a compact geared motor together with the motor body.
[0021] In a further embodiment, such as Figure 8 As shown, the inner side of the rear cover 3 is provided with a positioning boss 31 for mounting the PCB circuit board 71. The height of the positioning boss 31 is configured such that when the PCB circuit board 71 is mounted on it, the axial sensing distance between the working surface of the Hall magnetic ring 72 and the Hall element on the PCB circuit board 71 is no more than 5mm, ensuring the effectiveness of the Hall signal and providing a guarantee for the precise commutation and speed regulation of the motor.
[0022] During operation, the stator assembly 4 generates a rotating magnetic field, driving the rotor 51 and rotor shaft 52 of the rotor assembly 5 to rotate at high speed. The fan blade 53, fixed to the rear end of the rotor shaft 52, rotates accordingly. The Hall magnetic ring 72 on its end face moves relative to the Hall element on the PCB circuit board 71 fixed on the rear end cover 3, generating a precise position signal for controlling the motor commutation and speed regulation. At the same time, the input gear at the front end of the rotor shaft 52 transmits power to the gear assembly 6. Through multi-stage reduction by the combined gear 61, the output shaft gear 62 finally outputs low speed and high torque to drive the external load. Throughout the process, the counterweight 54 on the fan blade 53 ensures dynamic balance, and the sunken gear chamber 21 ensures a compact structure, achieving efficient, stable, low-noise, and low-cost operation of the motor as a whole.
Claims
1. A compact Hall effect geared motor, characterized in that: The assembly includes a housing (1), a housing cover (2), a rear end cover (3), a stator assembly (4), a rotor assembly (5), a gear assembly (6), and a Hall sensor (7). The housing cover (2) and the rear end cover (3) are fixedly connected to the axial ends of the housing (1), respectively. The stator assembly (4) is fixed inside the housing (1). The rotor assembly (5) is supported on the housing (1) and the rear end cover (3) by bearings. The rotor assembly (5) rotates freely inside the stator assembly (4). The gear assembly (6) is installed inside the housing cover (2). The rotor assembly (5) includes a rotor (51), a fixed... The rotor shaft (52) is connected inside the rotor (51) and the fan blade (53) is fixed to one end of the rotor shaft (52). The other end of the rotor shaft (52) is provided with an input gear. The input gear of the rotor shaft (52) extends into the gear assembly (6) and is connected to the reduction gear set therein. The Hall sensor (7) includes a PCB circuit board (71) and a Hall magnetic ring (72). The PCB circuit board (71) is fixedly connected to the end face of the rear cover (3). The Hall magnetic ring (72) is fixedly embedded in the end face of the fan blade (53) facing the rear cover (3).
2. The compact Hall geared motor according to claim 1, characterized in that: The housing (1) and the rear end cover (3) are manufactured by a die-casting process. Two protruding aluminum feed ports (8) are cast on the outer circumferential wall of the housing (1) and the outer circumferential wall of the rear end cover (3). The aluminum feed ports (8) are set on the outer wall of the stop structure formed after the housing (1) and the rear end cover (3) are assembled.
3. A compact Hall effect geared motor according to claim 1, characterized in that: The stator assembly (4) includes a stator core (41) and a stator winding (42). The stator core (41) has an insulating groove (43) inside. The stator winding (42) is fixedly embedded in the insulating groove (43). The groove wedge (44) is fixedly pressed against the opening of the insulating groove (43) to seal the stator winding (42).
4. A compact Hall effect geared motor according to claim 1, characterized in that: On the other side of the fan blade (53) which is 180° symmetrical to the position where the Hall magnetic ring (72) is installed, a cast counterweight (54) is fixedly installed.
5. A compact Hall effect geared motor according to claim 1, characterized in that: The gear assembly (6) includes a combination gear (61) and an output shaft gear (62). The gear chamber (21) is provided inside the cover (2). The combination gear (61) and the output shaft gear (62) are rotatably mounted in the gear chamber (21) inside the cover (2) through bearings. The upper shaft section of the output shaft gear (62) extends out from the bearing hole on the cover (2) as the final output shaft. The combination gear (61) is a gear set composed of two coaxial rotating gears. The combination gear (61) meshes with the input gear and the output shaft gear (62) of the rotor shaft (52) respectively to form a multi-stage reduction transmission.
6. A compact Hall effect geared motor according to claim 5, characterized in that: The gear chamber (21) where the combined gear (61) is located is lowered, and a groove structure for accommodating the combined gear (61) is provided at the bottom of the gear chamber (21). That is, the height of the gear chamber where the combined gear (61) is located is lower than that of the gear chamber where the output shaft gear is located.
7. A compact Hall effect geared motor according to claim 1, characterized in that: The inner side of the rear cover (3) is provided with a positioning boss (31) for mounting the PCB circuit board (71). The height of the positioning boss (31) is configured such that the axial sensing distance between the working surface of the Hall magnetic ring (72) and the Hall element on the assembled PCB circuit board (71) is no greater than 5mm.
8. A compact Hall effect geared motor according to claim 1, characterized in that: The box body (1), the box cover (2) and the rear cover (3) are fixedly connected to each other by screws, and the screws are covered with heat shrink tubing.