Large-diameter low-magnetic-resistance torque online balancing structure and balancing method

Abstract

The present application relates to a kind of large-diameter low magnetic resistance moment online balancing structure, including installation and removal mechanism, stator, rotor and shafting support mechanism, installation and removal mechanism is installed on stator, rotor is embedded stator and is connected with shafting support mechanism through rotor connecting seat after stator;Stator includes stator core assembly, stator housing and stator fixing frame, stator core assembly includes stator magnetic conducting ring and core positioning block, stator magnetic conducting ring with core positioning block is installed in stator housing, stator housing is clamped on stator fixing frame, stator housing and stator fixing frame are respectively provided with the stator housing processing gap and the stator fixing frame processing gap of adjusting stator magnetic conducting ring.Stator housing processing gap and stator fixing frame processing gap are adjusted to stator magnetic conducting ring by balancing structure, so that magnetic resistance moment reaches uniform condition in 360 ° circumference range.The present application balancing method realizes the effective control of magnetic resistance moment, inhibits the generation of torque ripple and noise, so as to improve the overall performance and survival rate of motor.

Description

Technical Field

[0001] This invention relates to the field of torque motor technology, specifically to a large-diameter, low-reluctance torque online balancing structure and balancing method. Background Technology

[0002] The stator core, as a crucial magnetically conductive component of the motor stator, uses its internal magnetic material to effectively guide magnetic flux to the air gap region, forming a strong magnetic field. However, because the magnetic lines of force between the stator and rotor air gap follow the path of least magnetic reluctance to shorten their length, an unbalanced magnetic pull is generated between the stator and rotor. Furthermore, the permeability of the magnetic material in air is non-uniform. When the air gap magnetic field is uniformly distributed, the magnetic pull at each radial point of the rotor is balanced, and the resultant force is zero. When uneven forces occur at each radial point of the rotor due to electromagnetic or mechanical reasons, uneven magnetic reluctance torque is generated, which directly affects the motor's dynamic response and mechanical performance. The relative relationship between coercivity and torque is as follows:

[0003] B r =u r ·H c ……………………………(1)

[0004]

[0005] In the formula:

[0006] B r - Remanence (T);

[0007] H c - Coercivity (A / m);

[0008] u r - Relative permeability (H / m);

[0009] T - Torque (N / m);

[0010] N - Total number of conductors;

[0011] B - Air gap magnetic flux density (T);

[0012] S - Cross-sectional area of ​​permanent magnet (mm2);

[0013] I-current (A);

[0014] a - Number of parallel branches;

[0015] p-pole-pole-log number;

[0016] From equations (1) and (2), we can obtain that the remanence B r With coercivity H cThe magnitude of the remanence is directly proportional to the size of the magnet. The larger the remanence, the larger the operating point of the permanent magnet, the larger the air gap magnetic flux density, and the greater the torque of the motor. When the motor is not powered on, the more uneven the coercivity of the motor at different positions, the greater the difference in the reluctance torque of the motor, which manifests as uneven reluctance torque. This leads to torque pulsation and noise, reducing the overall performance and survival rate of the motor.

[0017] Under normal circumstances, small-diameter finite torque motors rarely exhibit uneven coercivity. However, large-diameter finite torque motors, due to their large outer diameter, thick axial dimension, and often integral core structure, are highly susceptible to uneven coercivity when using soft magnetic materials after heat treatment.

[0018] To address the above-mentioned uneven magnetic drag torque phenomenon, a large-diameter, low magnetic drag torque online balancing structure and balancing method are proposed. Summary of the Invention

[0019] The purpose of this invention is to overcome the shortcomings of the prior art and provide a large-diameter, low magnetic reluctance torque online balancing structure. By adjusting the stator magnetic ring through the machining notches in the stator shell and the stator fixing frame, local large points of magnetic reluctance torque are eliminated, so that the magnetic reluctance torque reaches a uniform condition within a 360° circumference.

[0020] This invention also proposes a balancing method for a large-diameter, low-resistance torque online balancing structure, which enables effective control of the reluctance torque, solves the problem of uneven reluctance torque, suppresses torque pulsation and noise generation, thereby improving the overall performance and survival rate of the motor.

[0021] The technical problem solved by this invention is achieved through the following technical solution:

[0022] A large-diameter, low magnetic drag torque online balancing structure includes an assembly / disassembly mechanism, a stator, a rotor, and a shaft support mechanism. The assembly / disassembly mechanism is mounted on the stator, the rotor is embedded in the stator, and the rotor is connected to the shaft support mechanism via a rotor connecting seat.

[0023] The stator includes a stator core assembly, a stator housing, and a stator mounting bracket. The stator core assembly includes a stator magnetic ring and a core positioning block. The stator magnetic ring with the core positioning block is fitted inside the stator housing. The stator housing is fitted onto the stator mounting bracket. The stator housing and the stator mounting bracket are respectively provided with a stator housing machining notch and a stator mounting bracket machining notch for adjusting the stator magnetic ring.

[0024] Furthermore, the assembly / disassembly mechanism includes an assembly / disassembly bracket and a screw. The upper crossbar of the assembly / disassembly bracket is connected to the upper end of the screw. The lower ring of the assembly / disassembly bracket is installed on the upper end of the stator fixing frame. The lower end of the screw is connected to the stator housing through a threaded connection seat.

[0025] Furthermore, the screw has an internal shaft positioning hole.

[0026] Furthermore, the shaft support mechanism includes a shaft, a bearing housing, a bearing assembly, and a support base. The upper end of the shaft is mounted on the mounting and disassembly mechanism, the middle part of the shaft is located at the lower end of the rotor connecting seat, the lower end of the shaft is mounted in the bearing housing through the bearing assembly, and the bearing housing is mounted on the support base.

[0027] Furthermore, the bearing assembly includes a first bearing, a pressure plate, a lock nut, an inner pressure ring, an outer pressure ring, and a second bearing. The first bearing and the second bearing are located at the lower end of the shaft. An inner pressure ring and an outer pressure ring are respectively installed between the first bearing and the second bearing. The pressure plate is located at the upper end of the bearing seat and clamps the second bearing inside the bearing seat. The lock nut is located at the lower end of the bearing and locks the first bearing to the shaft.

[0028] A balancing method for a large-diameter, low-magnetic-resistance-torque online balancing structure includes the following steps:

[0029] Step 1: Place the assembled large-diameter, low-magnetic-resistance torque online balancing structure on the workbench;

[0030] Step 2: By turning the screw of the assembly / disassembly mechanism, the screw connecting seat is moved upward, exposing the rotor;

[0031] Step 3: Manually rotate the rotor. Under the action of the shaft support mechanism, the rotor performs online screening of the uniformity and condition of the magnetic resistance torque of the stator at each position within a 360° range.

[0032] Step 4: If there is a position with uneven magnetic resistance torque, the rotor will exhibit a rebound at a certain angle, meaning the rotor cannot stay at a certain position within a 360° range for an instant.

[0033] Step 5: Adjust the relative position of the stator magnetic ring by machining notches in the stator housing and the stator fixing bracket to achieve uniform magnetic resistance torque.

[0034] Step 6: Repeat steps 5 and 6 to screen the uniformity and condition of the magnetic resistance torque at each position of the stator in the 360° range online. Adjust the relative position of the stator magnetic ring by machining notches in the stator shell and stator fixing frame to make the magnetic resistance torque uniform.

[0035] Step 7: By turning the screw of the assembly / disassembly mechanism, the screw connecting seat is moved down to seal the rotor and stator;

[0036] Achieve online balancing of large-diameter, low-magnetic-resistance torque.

[0037] The advantages and positive effects of this invention are:

[0038] 1. The large-diameter low magnetic resistance torque online balancing structure of the present invention is composed of several magnetic rings of equal thickness and size spliced ​​together, replacing a single ring structure. This reduces the occurrence of uneven coercivity caused by materials or heat treatment processes. The magnetic resistance torque can be dynamically balanced by directly adjusting the positional relationship between the stator magnetic rings.

[0039] 2. The large-diameter low magnetic resistance torque online balancing structure of the present invention has stator housing and stator fixing frame respectively provided with stator housing machining notches and stator fixing frame machining notches for adjusting stator magnetic guide ring. There is a mechanical gap between stator magnetic guide ring and iron core positioning block. The relative position of stator magnetic guide ring is adjusted by the stator housing machining notch and stator fixing frame machining notch, eliminating local large points of magnetic resistance torque, so that the magnetic resistance torque reaches a uniform condition within a 360° circumference.

[0040] 3. The present invention provides a large-diameter, low magnetic resistance torque online balancing structure, which includes a mounting bracket and a screw. By turning the screw, the screw connecting seat is moved upward. Without completely disassembling the stator and rotor, the uniformity and variation of the magnetic resistance torque of the rotor within a 360° range on the shaft support mechanism can be screened.

[0041] 4. The large-diameter low magnetic resistance torque online balancing structure of the present invention includes a shaft support mechanism comprising a shaft, a bearing seat, a bearing assembly, and a support base. The shaft support mechanism has a 360° rotation feature. By manually rotating the rotor slowly, the uniformity and variation of the magnetic resistance torque of the stator core assembly within the 360° range can be screened. At the same time, it provides axial and radial support for the online balancing of the large-diameter low magnetic resistance torque, ensuring that the rotor can achieve continuous rotation.

[0042] 5. The balancing method of the large-diameter low magnetic reluctance torque online balancing structure of the present invention is simple and highly operable. It does not require repeated disassembly and assembly of the stator. By screening the change of magnetic reluctance torque of the rotor within the circumferential range, the relative positions between the stator magnetic rings are balanced online to make the magnetic reluctance torque uniform. This method can significantly improve the survival rate of the motor while ensuring the realization of motor performance. Attached Figure Description

[0043] Figure 1 This is a three-dimensional schematic diagram of the large-diameter, low magnetic drag torque online balance structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the large-diameter, low magnetic drag torque online balance structure of the present invention;

[0045] Figure 3 for Figure 2 AA cross-sectional diagram;

[0046] Figure 4This is a schematic diagram showing the coordination between the stator, rotor, and shaft support mechanism of the large-diameter, low magnetic drag torque online balancing structure of the present invention.

[0047] Figure 5 for Figure 4 Exploded view;

[0048] Figure 6 This is a schematic diagram of the stator core assembly of the large-diameter, low magnetic drag torque online balancing structure of the present invention;

[0049] Figure 7 for Figure 6 BB cross-sectional diagram;

[0050] Figure 8 This is a graph showing the relationship between the angle and the magnetic coercivity before the large-diameter, low-magnetic-resistance torque of this invention is balanced online.

[0051] Figure 9 This is a graph showing the relationship between the angle and the magnetic coercivity after the large-diameter, low-magnetic-resistance torque of the present invention is balanced online.

[0052] In the picture:

[0053] 1-Assembly / disassembly mechanism, 11-Assembly / disassembly bracket, 12-Screw, 13-Shaft positioning hole, 14-Screw connecting seat, 2-Stator, 21-Stator core assembly, 22-Stator magnetic ring, 23-Core positioning block, 24-Stator housing, 25-Stator fixing bracket, 26-Stator housing machining notch, 27-Stator fixing bracket machining notch, 3-Rotor, 31-Rotor connecting seat, 4-Shaft support mechanism, 41-Shaft, 42-Bearing 1, 43-Pressure plate, 44-Lock nut, 45-Bearing seat, 46-Support base, 47-Inner pressure ring, 48-Outer pressure ring, 49-Bearing 2. Detailed Implementation

[0054] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0055] like Figures 1 to 7 As shown, a large-diameter, low magnetic drag torque online balancing structure includes an assembly / disassembly mechanism 1, a stator 2, a rotor 3, and a shaft support mechanism 4. The assembly / disassembly mechanism 1 is mounted on the stator 2, the rotor 3 is embedded in the stator 2, and the rotor 3 is connected to the shaft support mechanism 4 through a rotor connecting seat 31.

[0056] The stator 2 includes a stator core assembly 21, a stator housing 24, and a stator mounting bracket 25. The stator core assembly 21 includes a stator magnetic ring 22 and a core positioning block 23. The stator magnetic ring 22, with the core positioning block 23 installed, is fitted inside the stator housing 24. The stator housing 24 is fitted onto the stator mounting bracket 25. The stator housing 24 and the stator mounting bracket 25 are respectively provided with a stator housing machining notch 26 and a stator mounting bracket machining notch 27 for adjusting the stator magnetic ring 22. The stator magnetic ring 22 is composed of several magnetic rings of equal thickness and size spliced ​​together. It is connected by the core positioning block 23 coaxially 41, and is fixed axially and radially by the core positioning block 23. The stator magnetic ring 22 and the core positioning block 23 are in clearance fit. The bottom end of the core positioning block 23 is provided with a threaded hole. The stator housing 24 is connected to the stator core assembly 21 by screws. There is a mechanical gap between the stator magnetic ring 22 and the core positioning block 23. The relative position of the stator magnetic ring 22 can be adjusted by the machining notch 26 in the stator housing and the machining notch 27 in the stator fixing frame to eliminate local large points of magnetic resistance torque and make the magnetic resistance torque uniform within the 360° circumference.

[0057] The assembly / disassembly mechanism 1 includes an assembly / disassembly bracket 11 and a screw 12. The upper crossbar of the assembly / disassembly bracket 11 has a threaded hole at its center. The upper end of the screw 12 is threadedly connected to the crossbar. The lower end of the assembly / disassembly bracket 11 is annularly fitted onto the upper end of the stator fixing bracket 25 and secured with screws. The lower end of the screw 12 is connected to the stator housing 24 via a threaded connecting seat. The screw 12 has a shaft positioning hole 13 for a limit shaft 41 inside. By turning the screw 12, the screw connecting seat 14 moves upward, allowing for the screening of the uniformity and variation of the magnetic resistance torque of the rotor 3 within a 360° range on the shaft support mechanism 4 without completely disassembling the stator 2 and rotor 3.

[0058] The shaft support mechanism 4 includes a shaft 41, a bearing seat 45, a bearing assembly, and a support base 46. The upper end of the shaft 41 is installed in the shaft positioning hole 13 of the screw 12 of the mounting and dismounting mechanism 1. The middle part of the shaft 41 is located at the lower end of the rotor connecting seat 31. The lower end of the shaft 41 is installed in the bearing seat 45 through the bearing assembly. The bearing seat 45 is installed on the support base 46. The shaft support mechanism 4 has a 360° rotation feature. By manually and slowly rotating the rotor 3, the uniformity and variation of the magnetic reluctance torque of the stator core assembly 21 within a 360° range can be screened. At the same time, it provides axial and radial support for the online balancing of large-diameter, low magnetic reluctance torque, ensuring that the rotor 3 can rotate continuously.

[0059] The bearing assembly includes a first bearing 42, a pressure plate 43, a lock nut 44, an inner pressure ring 47, an outer pressure ring 48, and a second bearing 49. The first bearing 42 and the second bearing 49 are located at the lower end of the shaft 41. The inner pressure ring 47 and the outer pressure ring 48 are respectively installed between the first bearing 42 and the second bearing 49. The pressure plate 43 is located at the upper end of the bearing seat 45 and clamps the second bearing 49 into the bearing seat 45. The lock nut 44 is located at the lower end of the first bearing 42 and locks the first bearing 42 to the shaft.

[0060] Working principle of this invention:

[0061] Shaft 41 is mounted on bearing housing 45 via bearing assembly, and bearing housing 45 is mounted on support base 46. Stator fixing bracket 25 is mounted on the upper end of bearing housing 45. Stator housing 24 is installed inside stator fixing bracket 25. Stator core assembly 21 is installed inside stator housing 24. Stator core assembly 21 is threadedly connected to stator housing 24 via threaded hole at the bottom end of core positioning block 23 to form stator 2. Rotor 3 is embedded in stator 2. Rotor 3 is coaxially mounted with shaft 41 via rotor connecting seat 31. The upper end of screw 12 is threadedly connected to threaded hole at the center of upper crossbar of mounting bracket 11. The lower end of screw 12 is connected to stator housing 24 via threaded connecting seat. The upper end of shaft 41 is located inside screw 12 and has shaft positioning hole 13 for limiting shaft 41. The lower end of mounting bracket 11 is then clamped onto upper end of stator fixing bracket 25 and fixed with screws.

[0062] When using a large-diameter, low magnetic resistance torque online balancing structure, the screw connecting seat 14 is moved upward by turning the screw 12, exposing the rotor 3. There is no need to completely disassemble the stator 2 and rotor 3. The rotor 3 is manually rotated, and under the action of the shaft support mechanism 4, the uniformity and condition of the magnetic resistance torque of the stator 2 at various positions are screened online within a 360° range. If there are uneven magnetic resistance torque positions, the rotor 3 will exhibit a rebound at a certain angle, meaning the rotor 3 cannot momentarily stay at a certain position within the 360° range. The relative position of the stator magnetic ring 22 is adjusted by the machining notch 26 in the stator housing and the machining notch 27 in the stator fixing bracket to achieve uniform magnetic resistance torque. Then, the screw connecting seat 14 is moved downward by turning the screw 12 of the assembly / disassembly mechanism 1, sealing the rotor 3 and stator 2, thus completing the large-diameter, low magnetic resistance torque online balancing.

[0063] This invention provides a large-diameter, low magnetic reluctance torque online balancing structure. It eliminates the need for repeated disassembly and reassembly, directly adjusting the stator magnetic rings 22 via machining notches 26 in the stator housing and 27 in the stator fixing bracket. This adjustment of the relative positions of the stator magnetic rings 22 reduces the magnetic reluctance torque, eliminates localized high points in the magnetic reluctance torque, and ensures uniform magnetic reluctance torque across a 360° circumference, ultimately improving the motor's success rate.

[0064] A balancing method for a large-diameter, low-magnetic-resistance-torque online balancing structure includes the following steps:

[0065] Step 1: Place the assembled large-diameter, low-magnetic-resistance torque online balancing structure on the workbench;

[0066] Step 2: By turning the screw 12 of the assembly / disassembly mechanism 1, the screw connecting seat 14 is moved upward, exposing the rotor 3;

[0067] Step 3: Manually rotate rotor 3. Under the action of shaft support mechanism 4, rotor 3 performs online screening of the uniformity and condition of magnetic resistance torque of stator 2 at each position within a 360° range.

[0068] Step 4: If there is a position with uneven magnetic resistance torque, rotor 3 will exhibit a rebound at a certain angle, that is, rotor 3 cannot stay at a certain position within a 360° range for an instant.

[0069] Step 5: Adjust the relative position of the stator magnetic ring 22 by machining notch 26 in the stator housing and notch 27 in the stator fixing frame to make the magnetic resistance torque uniform.

[0070] Step 6: Repeat steps 5 and 6 to screen the uniformity and condition of the magnetic resistance torque of stator 2 at each position within a 360° range. Adjust the relative position of the stator magnetic ring 22 by machining notches 26 in the stator housing and 27 in the stator fixing frame to make the magnetic resistance torque uniform.

[0071] Step 7: By turning the screw 12 of the assembly / disassembly mechanism 1, the screw connecting seat 14 is moved down to close the rotor 3 and the stator 2;

[0072] Achieve online balancing of large-diameter, low-magnetic-resistance torque.

[0073] The stator housing 24 and stator mounting bracket 25 are respectively provided with stator housing machining notches 26 and stator mounting bracket machining notches 27, providing ample operating space for manual operation. There is a mechanical clearance between the stator magnetic guide ring 22 and the core positioning block 23. The shaft support mechanism 4 has a 360° rotation feature. By manually rotating the rotor 3 slowly, the uniformity and variation of the magnetic reluctance torque of the stator core assembly 21 within the 360° range can be screened. If non-uniformity points exist, the relative position between the stator magnetic guide rings 22 is adjusted through the stator housing machining notches 26 and stator mounting bracket machining notches 27 to remove localized large points of magnetic reluctance torque, achieving uniformity of the magnetic reluctance torque within the 360° circumference. The balancing method of the large-diameter, low magnetic reluctance torque online balancing structure avoids the adverse effects of repeated disassembly and assembly, gradually adjusting to homogenize the non-uniformity points of the magnetic reluctance torque until the requirements are met.

[0074] from Figure 8 and Figure 9As can be seen, the balancing method using a large-diameter, low-resistance torque online balancing structure can reduce the reluctance torque from a maximum of 15 A / m to 4 A / m (average) through online balancing, thereby achieving the effect of homogenizing the reluctance torque within the circumferential range and improving the survival rate of the motor.

[0075] This invention discloses a balancing method for a large-diameter, low-resistance torque online balancing structure, which achieves effective control of the reluctance torque, solves the problem of uneven reluctance torque, suppresses the generation of uneven reluctance torque, and simultaneously suppresses torque pulsation and noise generation, thereby improving the overall performance and survival rate of the motor.

[0076] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A large-diameter, low-magnetic-resistance-torque online balancing structure, characterized in that: It includes a disassembly mechanism (1), a stator (2), a rotor (3) and a shaft support mechanism (4). The disassembly mechanism (1) is installed on the stator (2). The rotor (3) is embedded in the stator (2). The rotor (3) is connected to the shaft support mechanism (4) through a rotor connecting seat (31). The stator (2) includes a stator core assembly (21), a stator housing (24), and a stator fixing frame (25). The stator core assembly (21) includes a stator magnetic ring (22) and a core positioning block (23). The stator magnetic ring (22) with the core positioning block (23) installed is fitted inside the stator housing (24). The stator housing (24) is fitted on the stator fixing frame (25). The stator housing (24) and the stator fixing frame (25) are respectively provided with a stator housing machining notch (26) for adjusting the stator magnetic ring (22) and a stator fixing frame machining notch (27). The assembly / disassembly mechanism (1) includes an assembly / disassembly bracket (11) and a screw (12). The upper horizontal bar of the assembly / disassembly bracket (11) is connected to the upper end of the screw (12). The lower ring of the assembly / disassembly bracket (11) is installed on the upper end of the stator fixing frame (25). The lower end of the screw (12) is connected to the stator housing (24) through a threaded connection seat. The shaft support mechanism (4) includes a shaft (41), a bearing seat (45), a bearing assembly, and a support base (46). The upper end of the shaft (41) is mounted on the mounting and disassembly mechanism (1), the middle part of the shaft (41) is located at the lower end of the rotor connecting seat (31), and the lower end of the shaft (41) is mounted in the bearing seat (45) through the bearing assembly. The bearing seat (45) is mounted on the support base (46). The bearing assembly includes bearing one (42), pressure plate (43), lock nut (44), inner pressure ring (47), outer pressure ring (48) and bearing two (49). Bearing one (42) and bearing two (49) are located at the lower end of shaft (41). Inner pressure ring (47) and outer pressure ring (48) are respectively installed between bearing one (42) and bearing two (49). Pressure plate (43) is located at the upper end of bearing seat (45) to clamp bearing two (49) in bearing seat (45). Lock nut (44) is located at the lower end of bearing one (42) to lock bearing one (42) to shaft.

2. The large-diameter, low magnetic drag torque online balance structure according to claim 1, characterized in that: The screw (12) has a shaft positioning hole (13) inside.

3. A balancing method for a large-diameter, low-magnetic-resistance torque online balancing structure as described in claim 1, characterized in that: Includes the following steps: Step 1: Place the assembled large-diameter, low-magnetic-resistance torque online balancing structure on the workbench; Step 2: By turning the screw of the assembly / disassembly mechanism, the screw connecting seat is moved upward, exposing the rotor; Step 3: Manually rotate the rotor. Under the action of the shaft support mechanism, the rotor performs online screening of the uniformity and condition of the magnetic resistance torque of the stator at each position within a 360° range. Step 4: If there is a position with uneven magnetic resistance torque, the rotor will exhibit a rebound at a certain angle, meaning the rotor cannot stay at a certain position within a 360° range for an instant. Step 5: Adjust the relative position of the stator magnetic ring by machining notches in the stator housing and the stator fixing bracket to achieve uniform magnetic resistance torque. Step 6: Repeat steps 5 and 6 to screen the uniformity and condition of the magnetic resistance torque at each position of the stator in the 360° range online. Adjust the relative position of the stator magnetic ring by machining notches in the stator shell and stator fixing frame to make the magnetic resistance torque uniform. Step 7: By turning the screw of the assembly / disassembly mechanism, the screw connecting seat is moved down to seal the rotor and stator; Achieve online balancing of large-diameter, low-magnetic-resistance torque.

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