Electrocorrosion improvement structure for motor bearing
By designing a specific groove structure in the injection molded stator shell and using high-precision injection molding technology, the distance between the conductive parts and the stator core between the motor bearings is accurately controlled, and the common mode capacitor fluctuation problem is solved, improving shaft voltage stability and motor performance .
Patent Information
- Application Number
- CN202421134855.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The prior art is difficult to accurately control the distance between the conductive parts between the motor bearings and the stator core, resulting in common mode capacitance fluctuations, affecting shaft voltage stability and electromagnetic compatibility.
The conductive parts are installed by designing a specific first groove in the injection molded stator shell, and combined with the high-precision injection molding technology of the injection molded stator shell, the distance between the conductive parts and the stator core is precisely controlled.
It realizes precise control of the distance between the conductive parts and the stator core, stabilizes the common mode capacitor, reduces the occurrence of shaft voltage instability and electrocorrosion, extends the service life of the bearing and reduces maintenance costs.
Smart Images
Figure CN222508973U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a motor bearing electrical corrosion improvement structure. Background Art
[0002] During the operation of the motor, the high-frequency common-mode current of the motor will form a potential difference between the inner and outer rings of the bearing. This potential difference may cause the bearing oil film to break down, causing electrocorrosion on the bearing surface, which will generate noise and even cause the bearing to jam in severe cases. To alleviate this problem, conductive components are usually used to connect the front and rear bearing seats of the motor to form a parallel connection of common-mode capacitors, thereby reducing the potential voltage division between the bearings.
[0003] In traditional solutions, power cables or thin metal plates are usually used to connect the front and rear bearing seats. Although these methods can reduce the potential division to a certain extent, they have a major drawback, that is, they cannot reliably guarantee that the distance between the conductive parts and the stator core is controlled within a precise range. If the distance between the conductive parts and the stator core is unstable, it will cause fluctuations in the common mode capacitance, which will in turn affect the stability of the shaft voltage.
[0004] In addition, due to the capacitance formed between the metal conductive parts and the stator core, if this distance cannot be accurately controlled, it will affect the electromagnetic compatibility and operating efficiency of the entire motor. Therefore, how to accurately control this distance has become a key technical issue in improving motor performance. Utility Model Content
[0005] The utility model aims to provide a motor bearing electro-corrosion improving structure, in which the distance between a conductive component and a stator core is controlled within a precise range.
[0006] The purpose of the utility model is achieved in this way:
[0007] A motor bearing electro-corrosion improvement structure comprises an injection-molded stator shell, a rotor assembly sleeved inside the injection-molded stator shell, a front bearing seat and a rear bearing seat for fixing the bearing, and a front bearing and a rear bearing for supporting the rotation of the rotor assembly;
[0008] The front bearing seat is arranged on the top of the injection-molded stator shell, and the front bearing is placed in the front bearing seat;
[0009] The rear bearing seat is arranged at the bottom of the injection-molded stator shell, and the rear bearing is placed in the rear bearing seat;
[0010] It also includes a conductive component, the side wall of the injection molded stator shell is provided with a first groove, the conductive component is placed in the first groove, the upper end of the conductive component extends to the front bearing seat position to connect the front bearing seat, the lower end of the conductive component extends between the injection molded stator shell and the rear bearing seat, and the rear bearing seat and the injection molded stator shell jointly press the lower end of the conductive component.
[0011] Precise distance control: By designing a specific first groove in the injection molded stator shell to install the conductive parts, combined with the high-precision injection molding technology of the injection molded stator shell, the distance between the conductive parts and the stator core can be very accurately controlled. This precise distance control helps stabilize the value of the common mode capacitor, thereby reducing the problem of unstable shaft voltage caused by capacitance fluctuations.
[0012] Reduce the risk of electrical corrosion of bearings: Due to the presence of conductive components, the potential difference between the front and rear bearings of the motor is effectively controlled, which reduces the risk of breakdown of the bearing oil film and thus reduces the occurrence of electrical corrosion. This directly extends the service life of the bearing and reduces maintenance costs.
[0013] Reliability and stability of the structure: The conductive parts are elastic when installed and fit tightly to the groove surface. This design not only ensures the stable installation of the conductive parts, but also maintains their position stability during mechanical vibration, reducing the risk of structural loosening or damage caused by vibration.
[0014] Improve production efficiency and reduce costs: By using injection molding technology and metal stamping parts, this design achieves rapid manufacturing and assembly of components, thereby reducing production costs and time. In addition, the one-piece molding of injection molding parts reduces additional assembly processes and improves production efficiency.
[0015] The purpose of the utility model can also be solved by the following technical measures:
[0016] Further, the first groove includes a front groove segment, a middle groove segment and a rear groove segment, and the front groove segment, the middle groove segment and the rear groove segment are connected to form a groove which is high in the middle and low on both sides, and a first inclination angle is formed at the transition between the front groove segment and the middle groove segment, and the inclination angle of the first inclination angle is less than 90°, and a third inclination angle is formed at the transition between the rear groove segment and the middle groove segment, and the inclination angle of the third inclination angle is less than 90°.
[0017] More optimized installation of conductive components: The design of high in the middle and low on both sides formed by connecting the front groove section, middle groove section and rear groove section of the groove provides a natural placement track for the conductive components, which helps to accurately place the conductive components according to the set path during installation and reduce installation errors.
[0018] Improve the mechanical stability of the structure: The setting of the first and third inclination angles allows the conductive component to slide in a natural slope during the assembly process, which not only simplifies the assembly process, but also enhances the mechanical fixation after installation. An inclination angle of less than 90° helps the conductive component fit more closely in the groove, and this close fit reduces the possibility of displacement or loosening due to vibration or impact.
[0019] Enhanced electrical performance consistency: Through precise groove design and application of tilt angles, the distance between the conductive parts and the stator core can be more effectively controlled, which helps maintain the consistency and stability of common-mode capacitance. This consistency is critical to reducing electrical noise and improving overall motor performance.
[0020] Furthermore, the conductive component includes a front section, a middle section and a rear section, and the front section, the middle section and the rear section are connected to form a conductive component which is high in the middle and low on both sides, and a second inclination angle is formed at the transition between the front section and the middle section, and the inclination angle of the second inclination angle is less than 90°, and a fourth inclination angle is formed at the transition between the rear groove section and the middle section, and the inclination angle of the fourth inclination angle is less than 90°.
[0021] Promoting ease and accuracy of assembly: The provision of the second and fourth inclination angles allows the conductive component to slide into place more smoothly when being installed into the groove of the injection-molded stator case.
[0022] Improve structural stability: The inclined transition design can also help the conductive parts remain stable in case of mechanical vibration or external impact.
[0023] Furthermore, the length of the middle section ≧ the length of the middle groove section, the second inclination angle ≤ the first inclination angle, the fourth inclination angle ≤ the third inclination angle, the height difference between the front section and the middle section ≤ the height difference between the front groove section and the middle groove section, and the height difference between the rear section and the middle section ≤ the height difference between the rear groove section and the middle groove section.
[0024] Precise groove design and matching of conductive parts: By precisely controlling the structure and morphology of the first groove (including the front groove segment, the middle groove segment and the rear groove segment), and the front, middle and rear segments of the corresponding conductive parts, it is ensured that the conductive parts can be perfectly matched and fit tightly in the groove. This matching reduces any possible looseness or misalignment, and improves the electrical continuity and mechanical stability of the overall structure.
[0025] Optimization of the tilt angle: By setting the tilt angles (first tilt angle, second tilt angle, third tilt angle and fourth tilt angle), the contact surface between the conductive component and the groove is optimized, which not only helps with the introduction and fixation during installation, but also reduces the slight displacement caused by vibration or thermal expansion during the operation of the motor, thereby maintaining good electrical connection and reducing electrical noise.
[0026] Combination of high-precision injection-molded stator shell and conductive components: The high-precision manufacturing of the injection-molded stator shell ensures the precise size and position of the groove, while the relatively simple metal stamping conductive component is tightly combined with the groove through elasticity after bending, preventing the conductive component from detaching from the first groove.
[0027] Furthermore, a second groove is provided on the top of the injection-molded stator shell, and a connecting ear is provided at the end of the front section, and the connecting ear is placed in the second groove.
[0028] Improve assembly stability and accuracy: The setting of the connecting ear allows the conductive component to be physically fixed to the stator shell, thereby enhancing the mechanical stability of the overall assembly. The second groove provides a dedicated positioning and fixing point for the connecting ear, which ensures the accurate position of the conductive component in the stator and avoids errors and displacements during assembly.
[0029] Furthermore, the connecting ear is provided with a fixing hole or a protrusion.
[0030] Furthermore, it also includes a conductive connector and a rivet, the front bearing seat is provided with a fixing hole, and both ends of the conductive connector are provided with fixing holes, the rivet passes through the fixing hole of the conductive connector and is locked in the fixing hole of the front bearing seat, so that the conductive connector and the front bearing seat are riveted, the rivet passes through another fixing hole of the conductive connector and is locked in the fixing hole of the connecting ear, or the protrusion of the connecting ear is inserted into the other fixing hole of the conductive connector for crimping, so that the conductive connector and the conductive component are connected.
[0031] Furthermore, the rear bearing seat is provided with a plug-in slot, the end of the rear section is provided with a socket, the bottom end of the injection molded stator shell is inserted into the socket, the socket is placed in the plug-in slot, and the rear bearing seat and the injection molded stator shell jointly press the conductive component.
[0032] Enhanced structural stability: By installing the card holder in the plug-in slot of the rear bearing seat, and the injection-molded stator shell and the rear bearing seat work together to press the conductive parts, the stability of the entire device during operation can be ensured and the loosening of parts caused by vibration can be reduced.
[0033] Simplify the assembly process: This plug-and-click assembly method simplifies the assembly process, making it faster and more efficient, especially suitable for mass production, thereby reducing labor costs and error rates.
[0034] The beneficial effects of the utility model are as follows:
[0035] The utility model can very accurately control the distance between the conductive component and the stator core by designing a specific first groove in the injection-molded stator shell to install the conductive component, combined with the high-precision injection molding technology of the injection-molded stator shell. This precise distance control helps to stabilize the value of the common-mode capacitor, thereby reducing the problem of unstable shaft voltage caused by capacitance fluctuations, and due to the presence of the conductive component, the potential difference between the front and rear bearings of the motor is effectively controlled, which reduces the risk of breakdown of the bearing oil film, thereby reducing the occurrence of electrical corrosion. This directly extends the service life of the bearing and reduces maintenance costs.
[0036] The utility model ensures that the conductive component can perfectly match and fit tightly in the groove by precisely controlling the structure and form of the first groove (including the front groove section, the middle groove section and the rear groove section), and the front section, the middle section and the rear section of the corresponding conductive component. This matching reduces any possible looseness or misalignment, improves the electrical continuity and mechanical stability of the overall structure, and the high-precision manufacturing of the injection-molded stator shell ensures the precise size and position of the groove, while the relatively simple metal stamping conductive component is tightly combined with the first groove through the elasticity after bending, preventing the conductive component from being separated from the first groove. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 A cross-sectional view of the motor.
[0038] Figure 2 A cross-sectional view of the injection-molded stator case.
[0039] Figure 3 Schematic diagram of the injection molded stator case.
[0040] Figure 4 Schematic diagram of the front bearing seat.
[0041] Figure 5 A schematic diagram of a conductive connector.
[0042] Figure 6 Schematic diagram of the connection between the front bearing seat and the conductive connector.
[0043] Figure 7 A schematic diagram of a conductive component.
[0044] Figure 8 A cross-sectional view of a conductive component.
[0045] Fig. 9 It is a schematic diagram of the connection between the conductive connector, the conductive component and the front bearing seat. DETAILED DESCRIPTION
[0046] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0047] Example, combined with Figures 1 to 9 As shown, a motor bearing electro-corrosion improvement structure comprises an injection molded stator shell 1, a rotor assembly 2 sleeved inside the injection molded stator shell 1, a front bearing seat 3 and a rear bearing seat 4 for fixing the bearing, and a front bearing 5 and a rear bearing 6 for supporting the rotation of the rotor assembly 2;
[0048] The front bearing seat 3 is arranged on the top of the injection-molded stator housing 1, and the front bearing 5 is placed in the front bearing seat 3;
[0049] The rear bearing seat 4 is arranged at the bottom of the injection-molded stator housing 1, and the rear bearing 6 is placed in the rear bearing seat 4;
[0050] It also includes a conductive component 7. The side wall of the injection molded stator shell 1 is provided with a first groove 8. The conductive component 7 is placed in the first groove 8. The upper end of the conductive component 7 extends to the front bearing seat 3 to connect to the front bearing seat 3. The lower end of the conductive component 7 extends between the injection molded stator shell 1 and the rear bearing seat 4. The rear bearing seat 4 and the injection molded stator shell 1 jointly press the lower end of the conductive component 7.
[0051] Furthermore, the first groove 8 includes a front groove segment 81, a middle groove segment 82 and a rear groove segment 83, and the front groove segment 81, the middle groove segment 82 and the rear groove segment 83 are connected to form a groove which is high in the middle and low on both sides, and a first inclination angle 84 is formed at the transition between the front groove segment 81 and the middle groove segment 82, and the inclination angle of the first inclination angle 84 is less than 90°, and a third inclination angle 100 is formed at the transition between the rear groove segment 83 and the middle groove segment 82, and the inclination angle of the third inclination angle 100 is less than 90°.
[0052] Furthermore, the conductive component 7 includes a front section 71, a middle section 72 and a rear section 73, and the front section 71, the middle section 72 and the rear section 73 are connected to form a conductive component 7 which is high in the middle and low on both sides, and a second inclination angle is formed at the transition between the front section 71 and the middle section 72, and the inclination angle of the second inclination angle 74 is less than 90°, and a fourth inclination angle 200 is formed at the transition between the rear groove section and the middle section 72, and the inclination angle of the fourth inclination angle 200 is less than 90°.
[0053] Further, the length L2 of the middle section 72 is ≧ the length L1 of the middle groove section 82, the second inclination angle 74 is ≤ the first inclination angle 84, the fourth inclination angle 200 is ≤ the third inclination angle 100, the height difference H2 between the front section 71 and the middle section 72 is ≤ the height difference H1 between the front groove section 81 and the middle groove section 82, and the height difference H2 between the rear section 73 and the middle section 72 is ≤ the height difference H1 between the rear groove section 83 and the middle groove section 82.
[0054] Furthermore, a second groove 11 is provided on the top of the injection-molded stator shell 1 , and a connecting ear 9 is provided at the end of the front section 71 , and the connecting ear 9 is placed in the second groove 11 .
[0055] Furthermore, the connecting ear 9 is provided with a fixing hole 91 or a protrusion.
[0056] Furthermore, it also includes a conductive connector 10 and a rivet. The front bearing seat 3 is provided with a fixing hole 91. Both ends of the conductive connector 10 are provided with fixing holes 91. The rivet passes through the fixing hole 91 of the conductive connector 10 and is locked in the fixing hole 91 of the front bearing seat 3, so that the conductive connector 10 and the front bearing seat 3 are riveted. The rivet passes through another fixing hole 91 of the conductive connector 10 and is locked in the fixing hole 91 of the connecting ear 9, so that the conductive connector 10 and the conductive component 7 are connected.
[0057] Furthermore, the rear bearing seat 4 is provided with a plug-in slot 41, and the end of the rear section 73 is provided with a socket 731, the bottom end of the injection-molded stator shell 1 is inserted into the socket 731, and the socket 731 is placed in the plug-in slot 41, and the rear bearing seat 4 and the injection-molded stator shell 1 jointly press the conductive component 7.
Claims
1. A motor bearing electro-corrosion improvement structure, comprising an injection molded stator shell, a rotor assembly sleeved inside the injection molded stator shell, a front bearing seat and a rear bearing seat for fixing the bearing, and a front bearing and a rear bearing for supporting the rotation of the rotor assembly; The front bearing seat is arranged on the top of the injection-molded stator shell, and the front bearing is placed in the front bearing seat; The rear bearing seat is arranged at the bottom of the injection-molded stator shell, and the rear bearing is placed in the rear bearing seat; Features: It also includes a conductive component, the side wall of the injection molded stator shell is provided with a first groove, the conductive component is placed in the first groove, the upper end of the conductive component extends to the front bearing seat position to connect the front bearing seat, the lower end of the conductive component extends between the injection molded stator shell and the rear bearing seat, and the rear bearing seat and the injection molded stator shell jointly press the lower end of the conductive component.
2. The motor bearing electrical corrosion improvement structure according to claim 1, characterized in that: The first groove includes a front groove section, a middle groove section and a rear groove section, wherein the front groove section, the middle groove section and the rear groove section are connected to form a groove which is high in the middle and low on both sides, and a first inclination angle is formed at the transition between the front groove section and the middle groove section, and the inclination angle of the first inclination angle is less than 90°, and a third inclination angle is formed at the transition between the rear groove section and the middle groove section, and the inclination angle of the third inclination angle is less than 90°.
3. The motor bearing electrical corrosion improvement structure according to claim 2 is characterized in that: The conductive component includes a front section, a middle section and a rear section, wherein the front section, the middle section and the rear section are connected to form a conductive component which is high in the middle and low on both sides, and a second inclination angle is formed at the transition between the front section and the middle section, and the inclination angle of the second inclination angle is less than 90°. A fourth inclination angle is formed at the transition between the rear groove section and the middle section, and the inclination angle of the fourth inclination angle is less than 90°.
4. The motor bearing electrical corrosion improvement structure according to claim 3 is characterized in that: The length of the middle section is ≧ the length of the middle groove section, the second inclination angle is ≤ the first inclination angle, the fourth inclination angle is ≤ the third inclination angle, the height difference between the front section and the middle section is ≤ the height difference between the front groove section and the middle groove section, and the height difference between the rear section and the middle section is ≤ the height difference between the rear groove section and the middle groove section.
5. The motor bearing electrical corrosion improvement structure according to claim 3 is characterized in that: The top of the injection-molded stator shell is provided with a second groove, and the end of the front section is provided with a connecting ear, and the connecting ear is placed in the second groove.
6. The motor bearing electrical corrosion improvement structure according to claim 5, characterized in that: The connecting ear is provided with a fixing hole or a protrusion.
7. The motor bearing electrical corrosion improvement structure according to claim 6, characterized in that: It also includes a conductive connector and a rivet. The front bearing seat is provided with a fixing hole, and both ends of the conductive connector are provided with fixing holes. The rivet passes through the fixing hole of the conductive connector and is locked in the fixing hole of the front bearing seat to rivet the conductive connector and the front bearing seat. The rivet passes through another fixing hole of the conductive connector and is locked in the fixing hole of the connecting ear, or the protrusion of the connecting ear is inserted into the other fixing hole of the conductive connector for crimping to connect the conductive connector and the conductive component.
8. The motor bearing electrical corrosion improvement structure according to claim 3 is characterized in that: The rear bearing seat is provided with a plug-in slot, the end of the rear section is provided with a socket, the bottom end of the injection molded stator shell is inserted into the socket, the socket is placed in the plug-in slot, and the rear bearing seat and the injection molded stator shell jointly press the conductive component.