An electric machine having a magnetic field shielding structure

Abstract

The present application relates to the technical fields of electric machines, in particular to an electric machine with a magnetic field shielding structure. It comprises: a machine shell; a main shaft, which is rotatably assembled to the inner side of the machine shell; a magnetic shielding ring assembly groove, which is opened on the outer surface of the machine shell, the groove bottom of the magnetic shielding ring assembly groove is provided with a shaft extension hole, the end of the main shaft extends out through the shaft extension hole and extends into the groove cavity of the magnetic shielding ring assembly groove; a sensing magnetic ring, which is sleeved and fixed to the end of the main shaft and located in the magnetic shielding ring assembly groove; a magnetic shielding ring, which is assembled and fixed in the magnetic shielding ring assembly groove and located on the outside of the sensing magnetic ring; an ECU controller, which is fixed to the outer surface of the machine shell and oppositely arranged with the sensing magnetic ring. The present application has the advantages of: not occupying the internal cavity space of the electric machine; improving the general rate of parts; and simple and efficient assembly operation.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a motor with a magnetic field shielding structure. Background Technology

[0002] Currently, some domestic motors require applications in high-precision, high-efficiency, low-heat-generating, and fast-response conditions. In these cases, a magnetic shielding structure is needed to block magnetic leakage paths and ensure stable data acquisition by the ECU controller.

[0003] However, the current magnetic shielding structure has many drawbacks: the existing magnetic shielding structure needs to be installed inside the motor. In order to meet the electrical insulation requirements, additional insulation structure and installation space need to be reserved, which directly leads to an increase in the axial length of the motor, an increase in the overall size of the machine, and an increase in material and manufacturing costs. This is not conducive to the miniaturization and lightweight design of the motor. In addition, the existing magnetic shielding structure adopts the internal installation method of riveting and fixing. The assembly process is complicated, the process control is difficult, and the riveting quality cannot be precisely controlled. Problems such as insufficient riveting strength and loosening and falling off are prone to occur. The falling off parts can directly cause internal short circuits in the motor, resulting in motor failure, shutdown, or even safety accidents.

[0004] In summary, there is a need for a motor with a magnetic field shielding structure that does not occupy the internal space of the motor and is easy to install. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a motor with a magnetic field shielding structure that does not occupy the internal space of the motor and is easy to install.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An electric motor with a magnetic field shielding structure includes: chassis; A main shaft, which is rotatably mounted on the inside of the housing; A magnetic shielding ring assembly groove is provided on the outer surface of the housing. A shaft extension hole is provided at the bottom of the magnetic shielding ring assembly groove. The end of the main shaft extends out through the shaft extension hole and into the cavity of the magnetic shielding ring assembly groove. A sensing magnetic ring is fitted and fixed to the end of the main shaft and is located in the magnetic shielding ring assembly groove; A magnetic shielding ring is assembled and fixed in the magnetic shielding ring assembly groove, and the magnetic shielding ring is located on the outside of the sensing magnetic ring; An ECU controller is fixed to the outer surface of the housing and arranged opposite to the sensing magnetic ring.

[0007] The sensing magnetic ring, mounted on the end of the main shaft, rotates synchronously with the main shaft and generates a periodic alternating magnetic field. The ECU controller, installed on the outside of the housing and arranged opposite to the sensing magnetic ring, automatically senses the alternating magnetic field and completes the acquisition of rotor speed and angular position signals. Since the stator and rotor generate stray leakage magnetic field when the motor is working, the magnetic shielding ring, located in the mounting groove of the wall magnetic shielding ring and surrounding the sensing magnetic ring, can form a closed magnetic shielding path for the sensing magnetic ring. This can effectively block external interference magnetic fields from entering the sensing area and prevent the superposition of stray magnetic fields from causing distortion of the magnetic field signal acquired by the ECU. This invention externally mounts the magnetic shielding ring in a magnetic shielding ring assembly slot on the outside of the housing, eliminating the need to occupy internal motor cavity space, reserve shielding installation positions and matching insulation structures inside the housing, and not increasing the axial dimension of the motor after assembly. This simplifies the internal component layout, facilitates miniaturization and lightweight design of the motor, and reduces overall machine processing costs. The magnetic shielding ring adopts a unified and standardized ring structure, which is compatible with multiple motors of different specifications, eliminating the need for customized development for each motor. This significantly reduces the workload of structural design and dedicated mold development, lowers R&D investment and mold costs, and improves the commonality of components. The magnetic shielding ring and the magnetic shielding ring assembly slot are fixed by insertion, eliminating the traditional riveting assembly method, making the assembly operation simple and efficient.

[0008] Preferably, the outer ring wall of the magnetic shielding ring is adapted to the contour of the groove wall of the magnetic shielding ring assembly slot. The magnetic shielding ring is inserted into the magnetic shielding ring assembly slot axially, and the outer ring wall of the magnetic shielding ring and the groove wall of the magnetic shielding ring assembly slot adopt an interference fit. The magnetic shielding ring is installed into the assembly slot by axial insertion, and is locked and fixed by the interference fit between the outer ring wall and the inner wall of the slot. The assembly operation is simple and efficient, and the structure is stable and reliable. It avoids the problems of cumbersome procedures, difficulty in riveting strength control, and loosening and falling off of the shielding ring caused by traditional riveting processes. It also eliminates the risk of the shielding component falling into the motor and causing a short circuit, thus improving the reliability of motor operation.

[0009] Preferably, a base plate is fixed to the port of the magnetic shielding ring. The base plate is attached to the outer surface of the housing and covers the slot of the magnetic shielding ring assembly groove. The base plate has a heat dissipation channel, one end of which connects to the inside of the magnetic shielding ring assembly groove, and the other end of which connects to the outside of the magnetic shielding ring assembly groove. The base plate covers the slot of the magnetic shielding ring assembly groove and is attached to the outer surface of the housing, which can prevent some external dust and impurities from entering the interior of the magnetic shielding ring assembly groove and contaminating the sensing magnetic ring and the ECU sensing area. At the same time, the heat dissipation channel through the base plate connects the inside and outside of the assembly groove, which can form air convection and timely dissipate the heat accumulated by the motor in the assembly groove. This avoids the problem of demagnetization failure of the sensing magnetic ring due to long-term high temperature and the drift of the ECU controller signal due to heat. In addition, the base plate and the port of the magnetic shielding ring are fixed together, which further provides axial limit for the magnetic shielding ring and helps to improve the structural stability of the interference fit assembly.

[0010] Preferably, the substrate has a heat sink mounting slot on the side facing the magnetic shielding ring mounting slot. A honeycomb heat sink is fixedly mounted in the heat sink mounting slot. One end of the heat dissipation channel is located on the wall of the heat sink mounting slot and is arranged opposite to the honeycomb heat sink. The honeycomb heat sink is fixedly mounted in the heat sink mounting slot on the inner side of the substrate. One end of the heat dissipation channel is connected to the wall of the mounting slot and faces the honeycomb heat sink. The honeycomb porous structure can significantly increase the heat exchange contact area. Combined with the heat dissipation channel, it forms a convection airflow channel that runs through the inside and outside to quickly dissipate the heat accumulated in the mounting slot. This effectively reduces the operating temperature around the sensing magnetic ring and the ECU controller, and avoids high-temperature demagnetization of the magnetic ring and signal drift of the chip due to heat.

[0011] Preferably, the outer wall of the magnetic shielding ring is fixed with several limiting protrusions along the circumferential direction. The groove wall of the magnetic shielding ring assembly groove is provided with an axial limiting groove of the magnetic shielding ring that matches the limiting protrusions. The limiting protrusions and the axial limiting groove of the magnetic shielding ring slide together. One end of the axial limiting groove of the magnetic shielding ring extends to the opening of the magnetic shielding ring assembly groove. The groove wall at the other end of the axial limiting groove of the magnetic shielding ring is provided with a protrusion slot that matches the limiting protrusion. The limiting protrusion and the protrusion slot engage. When assembling the magnetic shielding ring, the limiting protrusions on the outer wall of the magnetic shielding ring are aligned with the axial limiting groove of the magnetic shielding ring extending to the opening of the groove wall of the magnetic shielding ring assembly groove. The magnetic shielding ring is pushed axially along the axial limiting groove of the magnetic shielding ring to complete the insertion. After the limiting protrusions slide to the end of the axial limiting groove of the magnetic shielding ring, the magnetic shielding ring is rotated so that the limiting protrusions are engaged in the corresponding protrusion slots at the end of the groove to achieve axial locking. Assembly guidance is achieved through the sliding engagement of the limiting protrusion and the axial limiting groove of the magnetic shielding ring, which prevents the magnetic shielding ring from shifting or tilting during installation. The engagement of the limiting protrusion and the protrusion slot provides axial limiting, effectively offsetting the axial vibration generated by the motor operation, preventing the magnetic shielding ring from axially moving and falling off, eliminating the need for additional alignment and calibration procedures during assembly, and simplifying the assembly process.

[0012] Preferably, the substrate has several positioning post mounting holes, in which positioning posts are slidably mounted. A spring connected to the positioning post is also provided within each positioning post mounting hole. The outer surface of the housing has a positioning groove adapted to the positioning post, located on the side of the magnetic shielding ring mounting groove. When the limiting protrusion on the magnetic shielding ring slides to the other end of the axial limiting groove of the magnetic shielding ring, the substrate adheres to the outer surface of the housing. Simultaneously, the positioning post is pushed by the housing and fully retracted into the positioning post mounting hole, compressing the spring. Rotating the substrate causes the limiting protrusion on the magnetic shielding ring to engage with the protrusion slot. At this point, the positioning post mounting hole on the substrate rotates to a position directly opposite the positioning groove. Under the elastic force of the spring, the positioning post extends and engages with the positioning groove, achieving substrate locking and positioning. During assembly, the magnetic shielding ring is pushed to the bottom along the axial limiting groove of the magnetic shielding ring. The base plate is attached to the outer surface of the housing. The outer wall of the housing pushes the positioning post so that it is completely retracted into the positioning post mounting hole and compresses the internal spring. The base plate is rotated, which drives the magnetic shielding ring to rotate until the limiting protrusion engages with the protrusion slot, completing the axial limiting of the magnetic shielding ring. At this time, the positioning post mounting hole on the base plate rotates synchronously to align with the positioning groove of the housing. The compressed spring releases its elastic force, pushing the positioning post out and engaging with the positioning groove, completing the circumferential locking of the base plate. The base plate is quickly self-locked by relying on the spring-driven positioning post to automatically engage with the positioning groove, eliminating the need for additional screws, clips, or other fasteners, simplifying assembly and disassembly operations. The positioning post, spring, and positioning groove form a circumferential anti-rotation limiting structure, which can offset the circumferential displacement of the base plate caused by motor vibration and prevent the limiting protrusion from coming out of the protrusion slot, causing the magnetic shielding ring to loosen and move. The double limiting structure further stabilizes the overall assembly position of the magnetic shielding ring and the base plate, continuously and stably maintaining the magnetic shielding effect and ensuring accurate and reliable signal acquisition by the ECU controller.

[0013] Preferably, a limiting slider is fixed on the side wall of the positioning post, and an axial limiting groove for the positioning post is formed in the wall of the mounting hole of the positioning post, which is adapted to the limiting slider. The limiting slider is placed in the axial limiting groove of the positioning post and slides with it. The spring is assembled inside the axial limiting groove of the positioning post, with one end of the spring abutting against the limiting slider and the other end of the spring abutting against the end wall of the axial limiting groove of the positioning post. The sliding engagement between the limiting slider and the axial limiting groove of the positioning post can radially limit the positioning post, preventing circumferential deflection and jamming during the extension and retraction of the positioning post. The springs at both ends of the groove, which abut against the limiting slider and the end wall of the groove respectively, are completely constrained by the groove, which can prevent the spring from deviating, dislodging, or being misaligned under force, ensuring that the spring always outputs stable elastic force along the axial direction of the positioning post, making the extension and retraction of the positioning post smooth and reliable, maintaining the self-locking positioning effect of the substrate for a long time, effectively preventing the substrate from loosening and rotating under motor vibration, and continuously ensuring the assembly positioning accuracy of the magnetic shielding ring and the stability of the ECU controller signal acquisition.

[0014] Preferably, the other end of the heat dissipation channel is located on the wall of the positioning post mounting hole. The positioning post has a heat transfer channel inside, with one end of the heat transfer channel located on the side wall of the positioning post and corresponding to the other end of the heat dissipation channel. The other end of the heat transfer channel is located on the end face of the positioning post facing the positioning groove. The housing has a heat exhaust channel inside, with one end of the heat exhaust channel located at the bottom of the positioning groove and corresponding to the other end of the heat transfer channel. The other end of the heat exhaust channel is located on the outer surface of the housing and avoids the ECU controller. When the positioning post is inserted into the positioning groove, one end of the heat transfer channel is aligned and connected to the other end of the heat dissipation channel. When the motor is working, the heat generated in the magnetic shielding ring mounting groove is conducted through the heat dissipation channel on the substrate to the positioning post mounting hole. After the positioning post is inserted into the positioning groove, the opening of the heat transfer channel on the side wall is aligned and connected to the end of the heat dissipation channel. The heat can be conducted along the heat transfer channel to the end face of the positioning post, and then enters the heat exhaust channel inside the housing through the opening at the bottom of the positioning groove, finally being discharged outwards from the channel outlet on the outside of the housing, avoiding the ECU controller. The heat dissipation channel, the internal heat transfer channel of the positioning post, and the heat exhaust channel of the casing form a continuous multi-level heat dissipation path, which can dissipate the accumulated heat in the magnetic shielding ring assembly slot in layers and stages, effectively reducing the operating temperature of the area where the sensing magnetic ring and ECU controller are located, avoiding the demagnetization of the magnetic ring and the drift of the controller signal caused by high temperature. The heat exhaust channel outlet is far away from the ECU controller, which can also prevent the exhaust hot air from blowing directly on the sensing chip and causing thermal interference. The positioning post not only realizes the locking and positioning function of the substrate, but also has the function of heat conduction and airflow guidance. The integrated reuse of parts reduces the number of accessories, simplifies the overall structure and reduces production costs. The complete airflow channel can maintain efficient heat dissipation for a long time, and stably ensure the magnetic shielding effect and the accuracy of the signal acquisition by the ECU controller.

[0015] Preferably, a first sealing ring is provided at one end of the heat transfer channel, and a second sealing ring is provided at the other end of the heat transfer channel. The first and second sealing rings are respectively located at the two ends of the heat transfer channel. When the positioning post is engaged in the positioning groove and the two ends of the heat transfer channel are respectively connected to the heat dissipation channel and the heat exhaust channel, the two sealing rings can tightly fit the channel connection gap to form a double-layer sealing structure. This prevents the hot airflow circulating in the channel from leaking out of the connection gap, ensuring that heat is completely discharged outward along the preset heat dissipation path, avoiding a decrease in heat dissipation efficiency. At the same time, the sealing rings can buffer the hard contact when the positioning post connects with the heat dissipation channel and the heat exhaust channel, reducing the loosening of gaps caused by motor vibration, and maintaining the channel connection sealing and heat dissipation stability for a long time.

[0016] Preferably, the end of the positioning post facing away from the positioning groove is provided with a lifting part. When disassembling the substrate, the positioning post can be pulled outward by the lifting part to overcome the spring force and pull the positioning post out of the positioning groove to release the substrate from the locking state. No additional tools are needed to pry and disassemble, making the operation convenient and labor-saving.

[0017] The beneficial effects of this invention are: it eliminates the need to occupy the internal cavity space of the motor, simplifies the layout of internal parts, facilitates the miniaturization and lightweight design of the motor, and reduces the overall processing cost; it reduces R&D investment and mold costs, and improves the commonality of parts; the assembly operation is simple and efficient; it improves the reliability of motor operation; and it ensures the assembly positioning accuracy of the magnetic shielding ring and the stability of the ECU controller signal acquisition. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an assembly diagram of the magnetic shielding ring being inserted into the magnetic shielding ring assembly slot; Figure 3 This is an assembly diagram of the sensor magnetic ring being installed into the main shaft; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is an assembly diagram showing the magnetic shielding ring being locked. Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 yes Figure 5 A schematic diagram of the assembly groove for the central magnetic shielding ring.

[0019] In the diagram: 1. Housing, 2. Main shaft, 3. Magnetic shielding ring assembly slot, 4. Shaft extension hole, 5. Sensing magnetic ring, 6. Magnetic shielding ring, 7. ECU controller, 8. Base plate, 9. Heat dissipation channel, 10. Heat sink assembly slot, 11. Honeycomb heat sink, 12. Limiting protrusion, 13. Axial limiting slide groove of magnetic shielding ring, 14. Protrusion slot, 15. Positioning post assembly hole, 16. Positioning post, 17. Spring, 18. Positioning groove, 19. Limiting slider, 20. Axial limiting slide groove of positioning post, 21. Heat transfer channel, 22. Heat dissipation channel, 23. First sealing ring, 24. Second sealing ring, 25. Lifting part. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device can be fixed in other ways, such as by rotating 90 degrees or being located in other orientations, and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment are part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 In the embodiments described above, a motor with a magnetic field shielding structure includes: Casing 1; Main shaft 2 is rotatably mounted on the inside of housing 1; The magnetic shielding ring assembly groove 3 is opened on the outer surface of the housing 1. The bottom of the magnetic shielding ring assembly groove 3 is provided with a shaft extension hole 4. The end of the main shaft 2 extends out through the shaft extension hole 4 and into the cavity of the magnetic shielding ring assembly groove 3. The sensing magnetic ring 5 is fixed to the end of the main shaft 2 and is located in the magnetic shielding ring assembly groove 3. The magnetic shielding ring 6 is assembled and fixed in the magnetic shielding ring assembly groove 3, and the magnetic shielding ring 6 is located on the outside of the sensing magnetic ring 5. ECU controller 7 is fixed on the outer surface of housing 1 and is arranged opposite to sensing magnetic ring 5.

[0025] The magnetic shielding ring 6 is made of laminated cold-rolled silicon steel in one piece by stamping. An insulating coating is set between the multiple layers of silicon steel sheets to block the conductive circuit and reduce the eddy current loss generated by the alternating magnetic field. The silicon steel material has high magnetic permeability, which can form a closed magnetic shielding path on the outside of the sensing magnetic ring 5, effectively blocking the stray leakage magnetic field inside the motor and the external environmental interference magnetic field, and avoiding the magnetic field superposition distortion from affecting the signal acquisition of the ECU controller 7.

[0026] In this embodiment, the ECU controller 7 adopts an existing mature motor position sensing control unit, which integrates a Hall magnetic sensing chip, signal conditioning circuit and main control chip. It is a conventional and well-known technology in the field, and no additional improvements are needed to its circuit architecture and signal acquisition logic. The ECU controller 7 relies on the built-in magnetic sensing chip to capture the alternating magnetic field signal generated by the rotation of the sensing magnetic ring 5 in real time. After amplification, filtering and analog-to-digital conversion by the internal circuit, it outputs rotor speed and rotation angle position data to realize basic functions such as motor commutation and speed closed-loop control. The innovation of this invention lies only in the external magnetic shielding, integrated heat dissipation and rotary locking assembly structure, and does not involve the hardware and control algorithm improvement of the ECU controller itself.

[0027] The outer ring wall of the magnetic shielding ring 6 is matched with the groove wall of the magnetic shielding ring assembly groove 3. The magnetic shielding ring 6 is inserted into the magnetic shielding ring assembly groove 3 along the axial direction. The outer ring wall of the magnetic shielding ring 6 and the groove wall of the magnetic shielding ring assembly groove 3 are interference fit.

[0028] like Figure 5 , Figure 6 and Figure 7 As shown, a base plate 8 is fixed at the port of the magnetic shielding ring 6. The base plate 8 is attached to the outer surface of the housing 1 and covers the slot of the magnetic shielding ring assembly groove 3. The base plate 8 has a heat dissipation channel 9. One end of the heat dissipation channel 9 is connected to the inner side of the magnetic shielding ring assembly groove 3, and the other end of the heat dissipation channel 9 is connected to the outside of the magnetic shielding ring assembly groove 3.

[0029] A heat dissipation box assembly groove 10 is provided on the side of the substrate 8 facing the magnetic shielding ring assembly groove 3. A honeycomb heat dissipation box 11, such as graphite composite ceramic material, is assembled and fixed in the heat dissipation box assembly groove 10. One end of the heat dissipation channel 9 is opened on the groove wall of the heat dissipation box assembly groove 10 and is arranged opposite to the honeycomb heat dissipation box 11.

[0030] The outer side wall of the magnetic shielding ring 6 is fixed with several limiting protrusions 12 along the circumferential direction. The groove wall of the magnetic shielding ring assembly groove 3 is provided with a magnetic shielding ring axial limiting slide groove 13 that is adapted to the limiting protrusions 12. The limiting protrusions 12 and the magnetic shielding ring axial limiting slide groove 13 are slidably engaged. One end of the magnetic shielding ring axial limiting slide groove 13 extends to the groove opening of the magnetic shielding ring assembly groove 3. The groove wall at the other end of the magnetic shielding ring axial limiting slide groove 13 is provided with a protrusion slot 14 that is adapted to the limiting protrusions 12. The limiting protrusions 12 and the protrusion slot 14 are engaged.

[0031] The substrate 8 has several positioning post mounting holes 15, and positioning posts 16 are slidably mounted in the positioning post mounting holes 15. A spring 17 connected to the positioning post 16 is also provided in the positioning post mounting holes 15. The outer surface of the housing 1 has a positioning groove 18 adapted to the positioning post 16. The positioning groove 18 is located on the side of the magnetic shielding ring mounting groove 3. When the limiting protrusion 12 on the magnetic shielding ring 6 slides to the other end of the axial limiting groove 13 of the magnetic shielding ring, the substrate 8 is attached to the outer surface of the housing 1. At the same time, the positioning post 16 is pushed by the housing 1 and completely retracted into the positioning post mounting hole 15 and the spring 17 is compressed. Rotating the substrate 8 causes the limiting protrusion 12 on the magnetic shielding ring 6 to engage with the protrusion slot 14. At this time, the positioning post mounting hole 15 on the substrate 8 is rotated to the position directly opposite the positioning groove 18. The positioning post 16 extends out under the elastic force of the spring 17 and engages with the positioning groove 18 to lock and position the substrate 8.

[0032] A limiting slider 19 is fixed on the side wall of the positioning post 16. The hole wall of the positioning post assembly hole 15 is provided with a positioning post axial limiting groove 20 that is adapted to the limiting slider 19. The limiting slider 19 is placed in the positioning post axial limiting groove 20 and slides with it. The spring 17 is assembled inside the positioning post axial limiting groove 20. One end of the spring 17 abuts against the limiting slider 19, and the other end of the spring 17 abuts against the end wall of the positioning post axial limiting groove 20.

[0033] The other end of the heat dissipation channel 9 is opened on the wall of the mounting hole 15 of the positioning post. The positioning post 16 is provided with a heat transfer channel 21. One end of the heat transfer channel 21 is opened on the side wall of the positioning post 16 and corresponds to the other end of the heat dissipation channel 9. The other end of the heat transfer channel 21 is opened on the end face of the positioning post 16 facing the positioning groove 18. The housing 1 is provided with a heat exhaust channel 22. One end of the heat exhaust channel 22 is opened at the bottom of the positioning groove 18 and corresponds to the other end of the heat transfer channel 21. The other end of the heat exhaust channel 22 is opened on the outer surface of the housing 1 and is arranged to avoid the ECU controller 7. When the positioning post 16 is inserted into the positioning groove 18, one end of the heat transfer channel 21 is aligned and connected with the other end of the heat dissipation channel 9.

[0034] A first sealing ring 23 is provided at one end of the heat transfer channel 21, and a second sealing ring 24 is provided at the other end of the heat transfer channel 21.

[0035] The end of the positioning post 16 that is away from the positioning groove 18 is provided with a lifting part 25, such as a threaded hole for a lifting rod.

[0036] Assembly process: First, fix the sensing magnetic ring 5 to the end of the main shaft 2 extending out of the housing 1 with an interference fit. Then, take the magnetic shielding ring 6 and align the limiting protrusion 12 on its outer wall with the axial limiting slide groove 13 of the magnetic shielding ring at the groove opening of the magnetic shielding ring assembly groove 3. Push the magnetic shielding ring 6 inward along the axial direction and slide it smoothly into the magnetic shielding ring assembly groove 3 with the guide of the slide groove until the limiting protrusion 12 reaches the bottom of the slide groove. At this time, the outer ring wall of the magnetic shielding ring 6 and the groove wall of the magnetic shielding ring assembly groove 3 form an interference fit and complete the initial fixation. The base plate 8 at the port of the magnetic shielding ring 6 is simultaneously attached to the outer surface of the housing 1. The outer wall of the housing presses the positioning post 16. The positioning post 16 slides inward along the positioning post axial limiting slide groove 20 and is completely housed into the positioning post assembly hole 15. The limiting slider 19 compresses the spring simultaneously. 17. It is put into an energy storage and compression state; then the substrate 8 and the magnetic shielding ring 6 are rotated as a whole, which drives the limiting protrusion 12 to slide into the protrusion slot 14 to realize the axial locking of the magnetic shielding ring 6. The substrate 8 rotates circumferentially at the same time, and the positioning post assembly hole 15 rotates to be directly opposite the positioning groove 18 on the outside of the housing 1. The compressed spring 17 releases its elastic force to push the limiting slider 19 and the positioning post 16 to extend outward. The end of the positioning post 16 is inserted into the positioning groove 18 to complete the circumferential anti-rotation locking of the substrate. After locking, the side wall opening of the heat transfer channel 21 on the side wall of the positioning post 16 is precisely aligned and connected with the end of the heat dissipation channel 9. The end face opening of the heat transfer channel 21 fits the inlet of the heat exhaust channel 22 at the bottom of the positioning groove 18. The first sealing ring 23 and the second sealing ring 24 are respectively pressed into the two channel joint gaps to form a sealing barrier.

[0037] Motor operation process: After the motor is powered on, the main shaft 2 drives the sensing magnetic ring 5 to rotate continuously, generating a periodic alternating induction magnetic field. The ECU controller 7 senses the magnetic field signal in real time and collects the rotor speed and rotation angle position. The magnetic shielding ring 6 surrounding the outside of the sensing magnetic ring 5 forms a closed magnetic shielding circuit, blocking the stray leakage magnetic field generated by the motor stator and rotor and the external environmental interference magnetic field, avoiding magnetic field signal distortion. During the continuous operation of the motor, the heat generated by the sensing magnetic ring 5 and the ECU sensing area inside the magnetic shielding ring assembly slot 3 is first transferred to the honeycomb heat sink box 11. The honeycomb porous structure expands the heat exchange area. The heat is conducted through the heat dissipation channel 9 on the substrate 8 to the positioning post assembly hole 15, and then through the heat transfer channel 21 connected to the side wall of the positioning post 16 to the end face of the positioning post. It is discharged outward from the outlet away from the ECU controller 7 on the outside of the housing 1 along the heat exhaust channel 22 at the bottom of the positioning slot 18. The complete through-type heat dissipation air channel continuously carries away the high temperature accumulated in the slot, preventing the sensing magnetic ring 5 from demagnetizing at high temperature and the ECU controller 7 from drifting due to heat.

[0038] Equipment maintenance and disassembly process: When it is necessary to disassemble and maintain the internal sensing magnetic ring 5, screw the external lifting threaded rod into the threaded hole of the lifting part 25 and tighten it. Then pull the lifting threaded rod outward to drive the positioning pin 16 to overcome the elastic force of the spring 17 and pull it out of the positioning groove 18, releasing the circumferential locking constraint of the base plate 8. Rotate the base plate 8 in the opposite direction to make the limiting protrusion 12 slide back from the protrusion slot 14 to the axial limiting slide groove 13 of the magnetic shielding ring. Pull out the magnetic shielding ring 6 along the slide groove to fully open the magnetic shielding ring assembly groove 3, which is convenient for operators to inspect and replace the sensing magnetic ring 5. No external disassembly tools such as screwdrivers and clip pliers are required throughout the process. The maintenance operation is simple and labor-saving. After disassembly and assembly, repeat the above assembly steps to restore the shielding and heat dissipation structure of the whole machine.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor with a magnetic field shielding structure, characterized in that, include: Casing (1); Main shaft (2), which is rotatably mounted on the inner side of the housing (1); A magnetic shielding ring assembly groove (3) is provided on the outer surface of the housing (1). A shaft extension hole (4) is provided at the bottom of the magnetic shielding ring assembly groove (3). The end of the main shaft (2) extends out through the shaft extension hole (4) and into the cavity of the magnetic shielding ring assembly groove (3). The sensing magnetic ring (5) is fixed to the end of the main shaft (2) and is located in the magnetic shielding ring assembly groove (3); A magnetic shielding ring (6) is assembled and fixed in the magnetic shielding ring assembly groove (3), and the magnetic shielding ring (6) is located on the outside of the sensing magnetic ring (5); ECU controller (7), the ECU controller (7) is fixed on the outer surface of the housing (1) and is arranged opposite to the sensing magnetic ring (5); The magnetic shielding ring (6) has a base plate (8) fixedly attached to its port. The base plate (8) is attached to the outer surface of the housing (1) and covers the slot of the magnetic shielding ring assembly groove (3). The base plate (8) has a heat dissipation channel (9). One end of the heat dissipation channel (9) is connected to the inner side of the magnetic shielding ring assembly groove (3), and the other end of the heat dissipation channel (9) is connected to the outer side of the magnetic shielding ring assembly groove (3). The outer side wall of the magnetic shielding ring (6) is fixedly provided with several limiting protrusions (12) along the circumferential direction. The magnetic shielding ring assembly groove (3) The groove wall of the substrate is provided with an axial limiting groove (13) of the magnetic shielding ring that is adapted to the limiting protrusion (12). The limiting protrusion (12) and the axial limiting groove (13) of the magnetic shielding ring are slidably engaged. One end of the axial limiting groove (13) of the magnetic shielding ring extends to the opening of the magnetic shielding ring assembly groove (3). The groove wall at the other end of the axial limiting groove (13) of the magnetic shielding ring is provided with a protrusion slot (14) that is adapted to the limiting protrusion (12). The limiting protrusion (12) and the protrusion slot (14) are engaged. (8) A plurality of positioning post assembly holes (15) are provided, and positioning posts (16) are slidably assembled in the positioning post assembly holes (15). A spring (17) connected to the positioning post (16) is also provided in the positioning post assembly holes (15). A positioning groove (18) adapted to the positioning post (16) is provided on the outer surface of the housing (1). The positioning groove (18) is located on the side of the magnetic shielding ring assembly groove (3). When the limiting protrusion (12) on the magnetic shielding ring (6) slides to the other end of the axial limiting groove (13) of the magnetic shielding ring. At this time, the substrate (8) is attached to the outer surface of the housing (1), and the positioning post (16) is pushed by the housing (1) and fully retracted into the positioning post assembly hole (15) and the spring (17) is compressed; the substrate (8) is rotated so that the limiting protrusion (12) on the magnetic shielding ring (6) is engaged in the protrusion slot (14). At this time, the positioning post assembly hole (15) on the substrate (8) is rotated to the position directly opposite the positioning groove (18). The positioning post (16) extends out under the elastic force of the spring (17) and is engaged in the positioning groove (18) to achieve the locking and positioning of the substrate (8).

2. The motor with a magnetic field shielding structure according to claim 1, characterized in that, The outer ring wall of the magnetic shielding ring (6) is adapted to the contour of the groove wall of the magnetic shielding ring assembly groove (3). The magnetic shielding ring (6) is inserted into the magnetic shielding ring assembly groove (3) along the axial direction. The outer ring wall of the magnetic shielding ring (6) and the groove wall of the magnetic shielding ring assembly groove (3) are interference fit.

3. The motor with a magnetic field shielding structure according to claim 1, characterized in that, The substrate (8) has a heat dissipation box assembly groove (10) on the side facing the magnetic shielding ring assembly groove (3). A honeycomb heat dissipation box (11) is assembled and fixed in the heat dissipation box assembly groove (10). One end of the heat dissipation channel (9) is opened on the groove wall of the heat dissipation box assembly groove (10) and is arranged opposite to the honeycomb heat dissipation box (11).

4. The motor with a magnetic field shielding structure according to claim 1, characterized in that, A limiting slider (19) is fixed on the side wall of the positioning post (16). The hole wall of the positioning post assembly hole (15) is provided with a positioning post axial limiting groove (20) that is adapted to the limiting slider (19). The limiting slider (19) is placed in the positioning post axial limiting groove (20) and slides with it. The spring (17) is assembled inside the positioning post axial limiting groove (20). One end of the spring (17) abuts against the limiting slider (19), and the other end of the spring (17) abuts against the end wall of the positioning post axial limiting groove (20).

5. A motor with a magnetic field shielding structure according to claim 1, characterized in that, The other end of the heat dissipation channel (9) is opened on the wall of the positioning post assembly hole (15). The positioning post (16) is provided with a heat transfer channel (21). One end of the heat transfer channel (21) is opened on the side wall of the positioning post (16) and corresponds to the other end of the heat dissipation channel (9). The other end of the heat transfer channel (21) is opened on the end face of the positioning post (16) facing the positioning groove (18). The housing (1) is provided with a heat exhaust channel (22). One end of the heat exhaust channel (22) is opened at the bottom of the positioning groove (18) and corresponds to the other end of the heat transfer channel (21). The other end of the heat exhaust channel (22) is opened on the outer surface of the housing (1) and is arranged away from the ECU controller (7). When the positioning post (16) is inserted into the positioning groove (18), one end of the heat transfer channel (21) is aligned and connected with the other end of the heat dissipation channel (9).

6. A motor with a magnetic field shielding structure according to claim 5, characterized in that, A first sealing ring (23) is provided at one end of the heat transfer channel (21), and a second sealing ring (24) is provided at the other end of the heat transfer channel (21).

7. A motor with a magnetic field shielding structure according to any one of claims 4-6, characterized in that, The positioning post (16) is provided with a lifting part (25) at the end opposite to the positioning groove (18).

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