A high-precision anti-interference rotor position sensor assembly structure

Abstract

The application discloses a high-precision anti-interference rotor position sensor assembly structure and relates to the technical field of motors. Specifically, the high-precision anti-interference rotor position sensor assembly structure comprises a fixed base and a base cover matched with the fixed base. A recess is arranged in the middle of the top of the fixed base, and a rotor position sensor is detachably connected in the recess. The fixed base is a hollow structure, and a through hole is arranged at the bottom of the inner cavity of the fixed base. A connecting assembly is arranged in the through hole, and the connecting assembly is connected with the bottom of the inner cavity of the fixed base. The assembly structure can effectively reduce the warping deformation of the fixed base caused by uneven local pre-tightening force, reduce the assembly gap difference of the combined surface of the fixed base and the motor shell, improve the electrical contact continuity of the combined surface, improve the electromagnetic shielding discontinuity problem caused by the stress deformation around the bolt hole, and reduce the electromagnetic signal coupling interference.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a high-precision, anti-interference rotor position sensor assembly structure. Background Technology

[0002] Rotor position sensors are key components for achieving closed-loop control in drive devices such as permanent magnet synchronous motors and servo motors. They are used to acquire rotor angular position signals in real time, providing core feedback for motor torque control and speed regulation. Among them, Hall effect rotor position sensors are widely used in industrial motors and new energy electric drives due to their simple structure, moderate cost, and fast response speed. Their installation positioning accuracy and assembly stability directly determine the accuracy of position detection and the reliability of motor operation.

[0003] In existing technologies, Hall effect rotor position sensors are typically assembled on motors by pre-drilling mounting holes in the motor housing or end cover and directly securing the sensor bracket or sensor body with bolts. However, during assembly, the alignment of the sensor with the motor holes relies primarily on manual visual inspection or simple tooling for positioning. Positioning accuracy is highly dependent on operator experience and technique, easily leading to circumferential offset and radial skew. This causes the relative position of the Hall element and rotor magnet to deviate from the design reference, resulting in position detection errors. Furthermore, the preload torque of each fixing bolt relies entirely on manual control, lacking a unified torque constraint standard. This makes it difficult to ensure uniform preload force across all bolts, potentially causing sensor misalignment or, in severe cases, localized deformation due to uneven stress. Moreover, traditional assembly structures inevitably have assembly gaps between the sensor and the mounting surface. Under conditions of motor start-stop impact, high-speed operation, and complex vibrations, these gaps are further amplified. Over time, the fixing bolts are prone to loosening and uncoupling, causing sensor position drift, signal jitter, or even detection failure, affecting motor control stability. In severe cases, this can lead to torque pulsation, abnormal operating noise, or even system malfunction. Meanwhile, the loose fit gaps may exacerbate electromagnetic signal coupling interference, further reducing the accuracy and anti-interference capability of the Hall sensor signal output.

[0004] Based on this, this application proposes a high-precision anti-interference rotor position sensor assembly structure. Summary of the Invention

[0005] This invention provides a high-precision anti-interference rotor position sensor assembly structure, which solves the problems mentioned in the background art, such as low assembly accuracy caused by manual positioning holes, inability to ensure uniformity of bolt preload by manual control, existence of assembly gaps, and easy loosening of bolts under vibration environment, which in turn cause sensor position drift, signal jitter, increased detection error, and decreased anti-interference capability.

[0006] This invention provides the following technical solution: a high-precision anti-interference rotor position sensor assembly structure, including a fixed base and a base cover adapted to the fixed base. A groove is provided in the center of the top of the fixed base, and a rotor position sensor is detachably connected to the groove. The fixed base is a hollow structure with a through hole at the bottom of its inner cavity. A connecting component is provided in the through hole, and the connecting component is connected to the bottom of the inner cavity of the fixed base. The fixed base is connected to a motor via the connecting component. A driving structure is provided within the inner cavity of the fixed base, and the connecting component is driven by the driving structure. The connecting assembly includes a fixed plate connected to the top of the through hole, and a lifting structure is provided in the middle of the fixed plate. A fixed rod is provided at the bottom of the fixed plate, and the bottom end of the fixed rod extends through the through hole to the bottom of the fixed base. A double-ended ball screw is movably connected to the fixed rod. The outer rings at both ends of the double-ended ball screw are provided with matching second ball nuts. An insert rod is connected to the side of the second ball nut away from the fixed rod. The insert rod is matched with a threaded hole provided on the motor. A deformation plate is provided on the outer side of the insert rod. The lifting structure is driven by a drive structure to achieve lifting. The lifting structure drives the double-ended ball screw to rotate through a transmission structure, causing the insert rod to translate and compress the deformation plate, causing the deformation plate to undergo radial deformation and engage with the threaded groove provided on the inner wall of the threaded hole.

[0007] Preferably, the base cover has a hollow structure, and its inner cavity is provided with a cooling flow channel. The inlet and outlet ends of the cooling flow channel are both connected to connection ports. The bottom of the base cover is provided with a shielded wire groove adapted to the rotor position sensor connection line.

[0008] Preferably, the insert rod is provided with a protrusion for locally compressing the deformation sheet, and the protrusions on adjacent insert rods are staggered in the axial height of the insert rod.

[0009] Preferably, the connection between the fixed base and the base cover is an interlocking structure, and surface contact is achieved through the interlocking of circumferential teeth.

[0010] Preferably, the lifting structure includes a ball screw movably connected to a fixed plate and a first ball nut adapted to the ball screw; the transmission structure includes a toothed plate connected to the outer side wall of the bottom end of the first ball nut and a gear connected to the double-ended ball screw, wherein the toothed plate and the gear are in a meshing state.

[0011] Preferably, the drive structure includes a transmission gear ring movably connected to the inner cavity of the fixed base, a driven gear meshing with the transmission gear ring, and a driving gear movably connected to the inner cavity of the fixed base. The driving gear meshes with the transmission gear ring, and the top of the ball screw is connected to the transmission gear ring.

[0012] Preferably, a through hole is provided on one side of the top of the fixed base, and a drive groove is provided in the middle of the drive gear, with the drive groove aligned with the through hole; a shielding ring is movably connected to the top of the fixed base, with the bottom of the shielding ring at the same height as the top of the through hole, and a slot adapted to the through hole is provided on the shielding ring.

[0013] Preferably, the outer ring at the top of the fixed base is provided with a connecting groove, and a connecting ring adapted to the connecting groove is provided at a corresponding position at the bottom of the base cover, and the mating surfaces of the connecting groove and the connecting ring engage with each other.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The assembly structure of this high-precision anti-interference rotor position sensor improves the electrical contact continuity of the mating surface by using an interlocking fit between the base and the base cover, so that the shielding shell forms a complete electrical closed loop, effectively enhancing the electromagnetic shielding effect and reducing the impact of external electromagnetic interference on the rotor position sensor.

[0015] 2. The high-precision anti-interference rotor position sensor assembly structure, by adopting a multi-rod synchronous movement assembly method, can effectively reduce the warping deformation of the fixed base caused by uneven local preload, reduce the assembly gap difference between the fixed base and the motor housing, improve the electrical contact continuity of the mating surface, thereby improving the electromagnetic shielding discontinuity problem caused by stress deformation around the bolt holes and reducing electromagnetic signal coupling interference.

[0016] 3. The assembly structure of this high-precision anti-interference rotor position sensor achieves the engagement and locking of the insertion rod and the threaded hole through the radial deformation of the deformation plate after assembly, eliminating the mating gap. It can effectively limit the circumferential and axial movement of the insertion rod and the base, prevent the assembly structure from loosening under vibration conditions, and improve the electrical contact stability of the mating surface to ensure the electromagnetic shielding effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly structure of a high-precision anti-interference rotor position sensor proposed in this invention; Figure 2 This is a schematic diagram of the assembly structure of a high-precision anti-interference rotor position sensor proposed in this invention. Figure 3 This is a schematic diagram of the rotor position sensor of the present invention installed in a fixed base; Figure 4 The structure of this invention Figure 3 Diagram showing the view from below; Figure 5 This is a schematic cross-sectional view of the fixed base of the present invention; Figure 6 This is an exploded view of the structural connection component of the present invention.

[0018] In the diagram: 1. Fixed base; 2. Base cover; 3. Connection port; 4. Deformation plate; 5. Connection groove; 6. Shielding ring; 7. Through hole; 8. Shielding wire groove; 9. Connection ring; 10. Transmission gear ring; 11. Driven gear; 12. Driving gear; 13. Slot; 14. Fixed plate; 15. Ball screw; 16. Ball nut; 17. Gear plate; 18. Fixed rod; 19. Double-ended ball screw; 20. Second ball nut; 21. Insert rod; 22. Gear; 23. Through hole. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides one embodiment: Please refer to Figures 1-6 A high-precision anti-interference rotor position sensor assembly structure includes a fixed base 1 and a base cover 2 adapted to the fixed base 1. The fixed base 1 is connected to the motor through a connecting component, and the base cover 2 is detachably connected to the motor end cover through conventional components such as bolts. A cavity is formed between the base cover 2 and the fixed base 1, and the rotor position sensor is located in the cavity to collect the rotational position and speed information of the motor rotor in real time and provide feedback signals to the motor controller.

[0021] The top outer ring of the fixed base 1 is provided with a connecting groove 5, and the bottom of the base cover 2 is provided with a connecting ring 9 that is adapted to the connecting groove 5. The mating surfaces of the connecting groove 5 and the connecting ring 9 are engaged. The connection seam between the fixed base 1 and the base cover 2 is an interlocking structure. The surface contact is achieved by the interlocking of circumferential teeth, which significantly increases the electrical contact path of the two mating surfaces, reduces the contact resistance, and improves the overall electrical continuity of the shell formed by the fixed base 1 and the base cover 2. At the same time, the interlocking structure can resist the gap opening caused by assembly stress and deformation, ensure electrical integrity, thereby effectively improving the electromagnetic coupling interference problem and ensuring the accuracy of the rotor position sensor.

[0022] The base cover 2 has a hollow structure with a cooling channel inside. Both the inlet and outlet ends of the cooling channel are connected to connection ports 3. Through the cooling channel, the temperature inside the chamber can be regulated by circulating cooling liquid, reducing the impact of high temperatures on the rotor position sensor and improving its detection accuracy. The bottom of the base cover 2 has a shielded wire groove 8 adapted to the rotor position sensor's connection wires. The shielded wire groove 8 constrains the sensor wiring harness, preventing friction and pulling between the harness and the housing during motor vibration, thus eliminating the risk of insulation damage or loose wiring. It also enables standardized wiring, eliminating the need for repeated manual adjustments to the wiring harness during assembly and avoiding damage to the wire core caused by messy wiring or excessive bending. Furthermore, it effectively isolates electromagnetic radiation, significantly reducing the coupling interference of external magnetic fields on the signal lines, while suppressing sensor signal leakage, significantly improving signal transmission stability and electromagnetic compatibility. The material of the shielded wire groove 8 can be set according to requirements and is not limited here.

[0023] A groove is provided in the middle of the top of the fixed base 1, and the rotor position sensor is located in the groove and is detachably connected to the fixed base 1. The fixed base 1 has a hollow structure, and the connecting component is set in the inner cavity of the fixed base 1. A through hole 7 is provided at the bottom of the inner cavity of the fixed base 1, and the lower end of the connecting component extends to the bottom of the fixed base 1 through the through hole 7.

[0024] The connecting assembly includes a fixed plate 14, which is connected to the top of the inner cavity of the through hole 7. A lifting structure is provided in the middle of the fixed plate 14. The lifting structure includes a ball screw 15 movably connected to the fixed plate 14 and a first ball nut 16 adapted to the ball screw 15. When the ball screw 15 rotates, the first ball nut 16 adapted to it can move in the direction of the ball screw 15.

[0025] A fixing rod 18 is provided at the bottom of the fixing plate 14. The bottom end of the fixing rod 18 extends to the bottom of the fixing base 1 through the through hole 7. A double-ended ball screw 19 is movably connected to the fixing rod 18. The lifting structure drives the double-ended ball screw 19 to rotate through the transmission structure. The transmission structure includes a toothed plate 17 connected to the outer wall of the bottom end of the first ball nut 16 and a gear 22 connected to the double-ended ball screw 19. The toothed plate 17 and the gear 22 are in a meshing state. Through the setting of the transmission structure, when the first ball nut 16 moves, it can drive the toothed plate 17 connected to it to move. When the toothed plate 17 moves, it can drive the gear 22 meshing with it to rotate. The gear 22 drives the double-ended ball screw 19 to rotate.

[0026] The double-ended ball screw 19 has a second ball nut 20 fitted to its outer ring at both ends. A connecting rod 21 is connected to the side of the second ball nut 20 away from the fixed rod 18. The connecting rod 21 fits into a threaded hole on the motor. A deformation plate 4 is provided on the outer side of the connecting rod 21. When the double-ended ball screw 19 rotates, the fitted second ball nut 20 can move in the direction of the double-ended ball screw 19. The movement of the second ball nut 20 drives the connected connecting rod 21 to move, changing the distance between the two connecting rods 21. The movement of the connecting rod 21 drives the connected deformation plate 4 to move. Before assembly, the outer diameter of the lower end of the connecting component is smaller than the inner diameter of the threaded hole, facilitating the insertion of the connecting component into the threaded hole. During assembly, the distance between the two connecting rods 21 gradually increases until the deformation plate 4 is tightly fitted against the inner wall of the threaded hole. Before assembly, the distance between the two connecting rods 21 can be set according to requirements and is not limited here.

[0027] Furthermore, the insertion rod 21 is provided with protrusions for local compression of the deformation plate 4. The shape and number of protrusions can be set according to requirements and are not limited here. The protrusions on adjacent insertion rods 21 are staggered in axial height. When the deformation plate 4 is tightly fitted with the inner wall of the threaded hole, the insertion rod 21 continues to move, and the protrusions can be used to compress the deformation plate 4. Under the action of the compressive force, the deformation plate 4 undergoes radial deformation and engages with the threaded groove provided on the inner wall of the threaded hole, realizing the connection between the fixed base 1 and the motor. It can also effectively limit the circumferential and axial movement of the insertion rod and the base, avoid loosening of the assembly structure under vibration conditions, improve the electrical contact stability of the mating surface, avoid electromagnetic shielding failure caused by poor contact, and ensure the electromagnetic shielding effect. The material of the deformation plate 4 can be set according to requirements and is not limited here.

[0028] The inner cavity of the fixed base 1 is equipped with a drive structure. The lifting structure achieves its lifting function through the drive structure. The drive structure includes a transmission gear ring 10 movably connected to the inner cavity of the fixed base 1, a driven gear 11 meshing with the transmission gear ring 10, and a driving gear 12 movably connected to the inner cavity of the fixed base 1. The driving gear 12 meshes with the transmission gear ring 10, and the top of the ball screw 15 is connected to the transmission gear ring 10. Through the configuration of the drive structure, when the driving gear 12 rotates, it can drive the transmission gear ring 10 to rotate. The transmission gear ring 10, through the driven gear 11 meshing with it, can drive the ball screw 15 to rotate. That is, in use, the drive structure can drive all the plug rods to move synchronously, effectively reducing the warping deformation of the fixed base 1 caused by uneven local preload, reducing the assembly gap difference between the fixed base 1 and the motor housing, improving the continuity of electrical contact at the joint surface, improving the electromagnetic shielding discontinuity problem caused by stress deformation around the bolt holes, and reducing electromagnetic signal coupling interference.

[0029] A through hole 23 is provided on one side of the top of the fixed base 1, and a drive groove is provided in the middle of the drive gear 12, which is aligned with the through hole 23. A shielding ring 6 is movably connected to the top of the fixed base 1, and the bottom of the shielding ring 6 is at the same height as the top of the through hole 23. A slot 13 adapted to the through hole 23 is provided on the shielding ring 6. With the shielding ring 6, when the operator needs to rotate the drive gear 12, the operator can drive the shielding ring 6 to rotate, changing the position of the slot 13 so that the slot 13 overlaps with the through hole 23. At this time, the drive groove, the through hole 23, and the slot 13 overlap. The operator can use a screwdriver or other tools adapted to the drive groove to rotate the drive gear 12. After assembly, the operator drives the shielding ring 6 to reset, and the slot 13 is offset from the drive groove. The shielding ring 6 protects and shields the drive groove, achieving dust protection and enhancing the continuity of the electromagnetic shielding of the shell.

[0030] The driving gear 12, driven gear 11, and transmission gear ring 10 all have damping between themselves and the fixed base 1. Under the action of external force, the drive structure can work. When the external force is removed, under the action of damping force, the positions of the driving gear 12, driven gear 11, and transmission gear ring 10 can remain unchanged, effectively preventing the gears from rotating on their own due to motor vibration, thereby ensuring that the reliability of the connection between this device and the motor is not affected.

[0031] In summary: When using the assembly structure of this high-precision anti-interference rotor position sensor, if the fixed base 1 needs to be assembled, the operator moves the fixed base 1 and inserts the lower end of the connecting component into the threaded hole on the motor until the fixed base 1 is tightly fitted with the motor. The operator then rotates the shielding ring 6 to change the position of the slot 13, so that the slot 13 overlaps with the through hole 23. At this time, the drive slot, the through hole 23, and the slot 13 overlap. The operator can then use a screwdriver or other tools that are compatible with the drive slot to rotate the drive gear 12.

[0032] When the driving gear 12 rotates, it drives the transmission gear ring 10 that meshes with it to rotate. The transmission gear ring 10 drives the driven gear 11 to rotate. The driven gear 11 drives the ball screw 15 to rotate. The rotation of the ball screw 15 causes the first ball nut 16 to move in the direction of the ball screw 15. The first ball nut 16 drives the gear plate 17 to move. The gear plate drives the gear 22 that meshes with it to rotate. The gear 22 drives the double-ended ball screw 19 to rotate. The rotation of the double-ended ball screw 19 allows the two insert rods 21 to move away from each other. During the relative movement of the two insert rods 21, the installation posture and placement position of the fixed base 1 can be finely adjusted, thereby achieving precise adjustment of the assembly position of the fixed base 1.

[0033] During the movement of the insertion rod 21, it can drive the deformation plate 4 to move. When the deformation plate 4 is tightly attached to the inner wall of the threaded hole, the insertion rod 21 can squeeze the deformation plate 4, so that the deformation plate 4 will undergo radial deformation and engage with the threaded groove provided on the inner wall of the threaded hole, thereby realizing the connection between the fixed base 1 and the motor, restricting the circumferential and axial movement of the insertion rod and the base, preventing the assembly structure from loosening under vibration conditions, and improving the electrical contact stability of the mating surface.

[0034] When the base cover 2 is connected to the motor end cover and the motor end cover is fixed to the motor, the base cover 2 and the fixed base 1 achieve surface contact through circumferential gear meshing.

[0035] All standard parts used in this invention are commercially available products, and irregularly shaped parts can be customized according to the specifications and drawings. All specific connection methods of the structures adopt well-known and mature technologies in the art, such as bolt connections. The machinery, parts, and equipment used are all existing models under current technical conditions, and models can be selected according to requirements without limitation. The material, size, and specifications of each component can be selected according to actual needs, and this specification does not limit this. Content not described in detail in this specification belongs to prior art known to those skilled in the art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision anti-interference rotor position sensor assembly structure, comprising a fixed base (1) and a base cover (2) adapted to the fixed base (1), characterized in that: The fixed base (1) has a groove in the middle of its top, and a rotor position sensor is detachably connected in the groove; the fixed base (1) is a hollow structure, and a through hole (7) is provided at the bottom of its inner cavity. A connecting component is provided in the through hole (7), and the connecting component is connected to the bottom of the inner cavity of the fixed base (1). The fixed base (1) is connected to the motor through the connecting component. The inner cavity of the fixed base (1) is provided with a driving structure, and the connecting component is driven by the driving structure. The connecting assembly includes a fixing plate (14) connected to the top of the through hole (7), and a lifting structure is provided in the middle of the fixing plate (14); a fixing rod (18) is provided at the bottom of the fixing plate (14), and the bottom end of the fixing rod (18) extends through the through hole (7) to the bottom of the fixing base (1). A double-ended ball screw (19) is movably connected to the fixing rod (18), and a second ball nut (20) is provided on the outer ring of both ends of the double-ended ball screw (19). The two ball nuts (20) are connected to a plug rod (21) on the side away from the fixed rod (18). The plug rod (21) is adapted to the threaded hole on the motor. A deformation plate (4) is provided on the outer side of the plug rod (21). The lifting structure is driven by the drive structure to achieve lifting. The lifting structure drives the double-headed ball screw (19) to rotate through the transmission structure, so that the plug rod (21) moves horizontally and squeezes the deformation plate (4), so that the deformation plate (4) undergoes radial deformation and meshes with the thread groove provided on the inner wall of the threaded hole.

2. The high-precision anti-interference rotor position sensor assembly structure according to claim 1, characterized in that: The base cover (2) is a hollow structure with a cooling channel in its inner cavity. Both the inlet and outlet ends of the cooling channel are connected to a connection port (3). The bottom of the base cover (2) is provided with a shielded wire groove (8) that is compatible with the rotor position sensor connection line.

3. The high-precision anti-interference rotor position sensor assembly structure according to claim 1, characterized in that: The insert (21) is provided with a protrusion for local compression deformation sheet (4), and the protrusions on adjacent inserts (21) are staggered in the axial height of the insert (21).

4. The high-precision anti-interference rotor position sensor assembly structure according to claim 1, characterized in that: The connection between the fixed base (1) and the base cover (2) is an interlocking structure, and the surface contact is achieved by the interlocking of circumferential teeth.

5. The high-precision anti-interference rotor position sensor assembly structure according to claim 1, characterized in that: The lifting structure includes a ball screw (15) movably connected to the fixed plate (14) and a first ball nut (16) adapted to the ball screw (15); the transmission structure includes a toothed plate (17) connected to the outer wall of the bottom end of the first ball nut (16) and a gear (22) connected to the double-ended ball screw (19), wherein the toothed plate (17) and the gear (22) are in a meshing state.

6. The high-precision anti-interference rotor position sensor assembly structure according to claim 5, characterized in that: The drive structure includes a transmission gear ring (10) movably connected to the inner cavity of the fixed base (1), a driven gear (11) meshing with the transmission gear ring (10), and a driving gear (12) movably connected to the inner cavity of the fixed base (1). The driving gear (12) meshes with the transmission gear ring (10), and the top of the ball screw (15) is connected to the transmission gear ring (10).

7. The high-precision anti-interference rotor position sensor assembly structure according to claim 6, characterized in that: A through hole (23) is provided on one side of the top of the fixed base (1), and a drive groove is provided in the middle of the drive gear (12). The drive groove is aligned with the through hole (23). The top of the fixed base (1) is movably connected to a shielding ring (6). The bottom of the shielding ring (6) is at the same height as the top of the through hole (23). The shielding ring (6) is provided with a slot (13) that is adapted to the through hole (23).

8. The high-precision anti-interference rotor position sensor assembly structure according to claim 4, characterized in that: The top outer ring of the fixed base (1) is provided with a connecting groove (5), and the bottom of the base cover (2) is provided with a connecting ring (9) that is adapted to the connecting groove (5). The mating surfaces of the connecting groove (5) and the connecting ring (9) are engaged.

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