A servo valve motor test fixture
By adjusting the distance between the magnetic angle encoder and the motor magnetic field in real time using a servo valve motor test fixture, the problems of low testing efficiency and insufficient dynamic accuracy in existing technologies are solved, achieving efficient dynamic calibration and low-cost maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HYFOSS TECHNOLOGY (SICHUAN) CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-02
AI Technical Summary
Existing motor testing equipment is inefficient during static debugging and cannot reflect the true air gap under dynamic operating conditions. Furthermore, the debugging of encoders covered by different materials in frameless motors is complicated, leading to signal distortion or hardware damage.
A servo valve motor test fixture is provided, which adjusts the distance between the magnetic angle encoder and the motor magnetic field in real time through the guide rail and slider structure, and achieves dynamic accuracy calibration by using a locking mechanism and knob fine adjustment.
It improves the debugging efficiency of motor testing, ensures dynamic accuracy, reduces maintenance costs, and adapts to the adjustment needs of different material spacing.
Smart Images
Figure CN224317671U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor testing technology, and more specifically relates to a servo valve motor testing fixture. Background Technology
[0002] Frameless motors are widely used in robot joints, precision medical equipment, aerospace, and other fields due to their high power density and flexible integration. Their core components include stator windings and a permanent magnet rotor, requiring a magnetic angle encoder to achieve high-precision position feedback. The spacing between the magnetic angle encoder and the rotor's magnetic ring is crucial to signal quality. Too small a spacing can easily lead to mechanical collisions or magnetic field saturation, damaging the encoder; too large a spacing results in signal attenuation and decreased accuracy.
[0003] Existing motor testing equipment has limitations in static calibration. Traditional methods require manual adjustment of the encoder position when the motor is stationary, verifying the effect through repeated start-stop tests. This is inefficient and cannot reflect the true air gap under dynamic conditions (such as thermal deformation and vibration). Furthermore, there is a lack of thermal deformation compensation. During motor operation, the windings heat up, causing structural expansion, which may cause the statically calibrated gap to deviate from the safe range, leading to signal distortion or hardware damage. Moreover, calibrating encoders with different material covers is complex. In specialized fields, frameless motors use bushings of different materials to completely enclose the rotor. These bushing materials can interfere with the magnetic field, requiring dynamic adjustments to determine the optimal spacing for each material. Utility Model Content
[0004] One objective of this utility model is to provide a servo valve motor test fixture for real-time adjustment of the distance between the magnetic angle encoder and the motor magnetic field during the operation of a frameless motor. The servo valve motor test fixture includes a fixed base, a mounting bracket set on the fixed base, a guide rail set on the mounting bracket, a slider set on the guide rail, and a mounting seat set on the slider.
[0005] The slider can move along the length of the guide rail, and a locking mechanism is provided on the slider to lock the relative position of the slider and the guide rail.
[0006] The guide rail is equipped with a motor mounting slider and a circuit board mounting slider. The motor mounting slider is equipped with a motor mounting base, and the circuit board mounting slider is equipped with a circuit board mounting base. The motor mounting base and the circuit board mounting base are respectively provided with mounting positions for fixing the motor stator and the circuit board. By adjusting the position of the circuit board mounting slider and the circuit board mounting slider on the guide rail, the relative distance between the magnetic angle encoder on the circuit board and the motor magnetic field can be adjusted.
[0007] Preferably, the guide rail is a dovetail guide rail, which can restrict the slider to move only along the length of the guide rail and not move or rotate in other directions.
[0008] Preferably, the guide rail is provided with a rack, and a gear matching the rack is provided at a corresponding position inside the slider. The slider is also provided with a knob that can drive the gear to rotate. Rotating the knob can drive the gear to rotate, thereby finely adjusting the position of the slider on the guide rail.
[0009] Preferably, the motor mounting base and the circuit board mounting base are detachably connected to the slider via fasteners;
[0010] The motor mounting base includes a connecting base part connected to the slider, an extension part connected to the connecting base part, and a clamp set on the extension part; the connecting base part is provided with fastener holes for detachable connection with the slider by fasteners, the extension part is used to adapt to different distances between the motor stator and the guide rail, and the clamp is used to fix the motor stator;
[0011] The circuit board mounting base includes a connecting base portion connected to the slider, an extension portion connected to the connecting base portion, and a mounting groove provided on the extension portion; the mounting groove matches the size of the circuit board, allowing the circuit board to be placed inside the mounting groove, with the magnetic angle encoder on the circuit board facing the direction of the motor stator, the extension portion being used to adapt to different distances between the circuit board and the guide rail, and the magnetic angle encoder being positioned close to the center of the motor rotor.
[0012] Preferably, the guide rail is further provided with an encoder mounting slider, and the encoder mounting slider is provided with an encoder mounting base. The encoder mounting base includes a connecting base part connected to the slider, an extension part connected to the connecting base part, and a mounting hole provided on the extension part, through which the encoder can be fixed in position.
[0013] Preferably, the servo valve motor test fixture further includes a coupling for connecting the motor and the encoder, with one end of the coupling connected to the encoder shaft and the other end of the coupling connected to the motor rotor.
[0014] Preferably, the locking mechanism includes a screw passing through the slider and a rotary handle connected to the screw; the screw and the slider are connected by a thread, and the screw can be rotated by rotating the handle, thereby causing the screw to pass through the slider and contact the guide rail to lock the relative position of the slider and the guide rail.
[0015] Preferably, the guide rail is provided with a scale, which can be used to determine the distance between the motor mounting slider and the circuit board mounting slider, and then calculate the distance between the magnetic angle encoder and the magnet at the bottom of the motor rotor.
[0016] As described above, the servo valve motor test fixture of this utility model supports real-time adjustment of the distance between the magnetic angle encoder and the magnetic field during the operation of the frameless motor, so as to improve debugging efficiency, ensure dynamic accuracy and reduce maintenance costs. Attached Figure Description
[0017] The present invention will be more fully understood through the following detailed description and in conjunction with the accompanying drawings, wherein similar elements are numbered in a similar manner, wherein:
[0018] Figure 1 This is a usage state diagram of a servo valve motor test fixture according to an embodiment of this utility model;
[0019] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;
[0020] Figure 3 yes Figure 1 Enlarged view of part B in the middle
[0021] Figure 4 This is a schematic diagram of the motor mounting slider and encoder mounting slider of a servo valve motor test fixture according to an embodiment of this utility model;
[0022] Figure 5 This is a schematic diagram of the circuit board mounting slider of a servo valve motor test fixture according to an embodiment of the present invention;
[0023] In the figure: fixed base 11, mounting bracket 12, guide rail 13, magnetic angle encoder 14, motor stator 15, motor rotor 16, knob 17, coupling 18, motor mounting slider 21, motor mounting base 22, clamp 23, circuit board mounting slider 31, circuit board mounting base 32, mounting groove 33, encoder mounting slider 41, mounting hole 42. Detailed Implementation
[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0025] It should be noted that if directional indicators (such as up, down, left, right, front, back, etc.) are involved in the embodiments of this invention, these directional indicators are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0026] Furthermore, if the embodiments of the present invention involve descriptions using terms such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0027] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings, but this utility model is not limited to the following embodiments.
[0028] Frameless motors are widely used in robot joints, precision medical equipment, aerospace, and other fields due to their high power density and flexible integration. Their core components include stator windings and a permanent magnet rotor, requiring a magnetic angle encoder 14 to achieve high-precision position feedback. The spacing between the magnetic angle encoder 14 and the rotor magnetic ring is crucial to signal quality. Too small a spacing can easily lead to mechanical collisions or magnetic field saturation, damaging the encoder; too large a spacing results in signal attenuation and decreased accuracy.
[0029] Existing motor testing equipment has limitations in static calibration. Traditional methods require manual adjustment of the encoder position when the motor is stationary, verifying the effect through repeated start-stop tests. This is inefficient and cannot reflect the true air gap under dynamic conditions (such as thermal deformation and vibration). Furthermore, there is a lack of thermal deformation compensation. During motor operation, the windings heat up, causing structural expansion, which may cause the statically calibrated gap to deviate from the safe range, leading to signal distortion or hardware damage. Moreover, calibrating encoders with different material covers is complex. In specialized fields, frameless motors use bushings of different materials to completely enclose the rotor between the stator and rotor. These bushing materials can interfere with the magnetic field, requiring dynamic adjustment to determine the optimal spacing for each material.
[0030] To address the aforementioned issues, this embodiment provides a servo valve motor test fixture for real-time adjustment of the distance between the magnetic angle encoder 14 and the motor magnetic field during frameless motor operation. The servo valve motor test fixture includes a fixed base 11, a mounting bracket 12 mounted on the fixed base 11, a guide rail 13 mounted on the mounting bracket 12, a slider mounted on the guide rail 13, and a mounting seat mounted on the slider.
[0031] The slider can move along the length of the guide rail 13. The slider is provided with a locking mechanism, which is used to lock the relative position of the slider and the guide rail 13.
[0032] The guide rail 13 is provided with a motor mounting slider 21 and a circuit board mounting slider 31. The motor mounting slider 21 is provided with a motor mounting base 22, and the circuit board mounting slider 31 is provided with a circuit board mounting base 32. The motor mounting base 22 and the circuit board mounting base 32 are respectively provided with mounting positions for fixing the motor stator 15 and the circuit board. By adjusting the position of the circuit board mounting slider 31 on the guide rail 13, the relative distance between the magnetic angle encoder 14 on the circuit board and the motor magnetic field can be adjusted.
[0033] In this embodiment, as Figure 1 , Figure 2 , Figure 3 As shown, the fixed base 11 is used to place the mounting bracket 12 on a flat surface. The mounting bracket 12 is in an upright state, and the mounting bracket 12 and the fixed base 11 can be connected by fasteners such as bolts.
[0034] The guide rail 13 is arranged along the height direction of the mounting bracket 12. The slider matches the guide rail 13 and can translate along the length direction of the guide rail 13. The locking mechanism includes a locked state and a free state. In the locked state, the relative position of the slider and the guide rail 13 is fixed. In the free state, the slider can slide on the guide rail 13.
[0035] Motor mounting slider 21 and circuit board mounting slider 31 are used to connect the motor and circuit board to be tested to the servo valve motor test fixture, respectively. The circuit board is the motor's drive board and is equipped with a magnetic angle encoder 14. The motor includes a stator 15 and a rotor 16. A magnet is located at the bottom of the rotor 16. Rotation of the rotor 16 drives the magnet to rotate, generating a changing magnetic field. The magnetic angle encoder 14 can detect the change in the magnetic field and calculate the rotor's rotation angle. The accuracy or sensitivity of the magnetic angle encoder 14 is affected by the distance between the magnetic angle encoder 14 and the magnet at the bottom of the rotor 16. Therefore, the distance between the magnetic angle encoder 14 and the magnet at the bottom of the rotor 16 needs to be adjusted using the motor mounting slider 21 and circuit board mounting slider 31 to find a suitable spacing between them.
[0036] Furthermore, the guide rail 13 is a dovetail guide rail, which can restrict the slider to move only along the length direction of the guide rail 13, and prevent it from moving or rotating in other directions.
[0037] In this embodiment, the slider is provided with a dovetail groove that matches the dovetail guide rail. The dovetail shape can restrict the slider to move only along the length direction of the guide rail 13.
[0038] Furthermore, a rack is provided on the guide rail 13, and a gear matching the rack is provided at a corresponding position inside the slider. A knob 17 that can drive the gear to rotate is also provided on the slider. Rotating the knob 17 can drive the gear to rotate, thereby finely adjusting the position of the slider on the guide rail 13.
[0039] In this embodiment, the rack, gear, and knob 17 are used to fine-tune the position of the slider via the knob 17.
[0040] Furthermore, the motor mounting base 22 and the circuit board mounting base 32 are detachably connected to the slider via fasteners;
[0041] The motor mounting base 22 includes a connecting base part connected to the slider, an extension part connected to the connecting base part, and a clamp 23 provided on the extension part; the connecting base part is provided with fastener holes for detachable connection with the slider by fasteners, the extension part is used to adapt to different distances between the motor stator 15 and the guide rail 13, and the clamp 23 is used to fix the motor stator 15.
[0042] The circuit board mounting base 32 includes a connecting base portion connected to the slider, an extension portion connected to the connecting base portion, and a mounting groove 33 provided on the extension portion; the mounting groove 33 matches the size of the circuit board, and the circuit board can be placed in the mounting groove. The magnetic angle encoder 14 on the circuit board faces the direction of the motor stator 15. The extension portion is used to adapt to different distances between the circuit board and the guide rail 13. The magnetic angle encoder 14 is located near the center of the motor rotor 16.
[0043] In this embodiment, as Figure 4 , Figure 5 As shown, the motor mounting base 22 and the circuit board mounting base 32 are used as a set. Different motor mounting bases 22 and circuit board mounting bases 32 are configured for different specifications of motors or circuit boards. The main feature is that the dimensions of the extension parts of the motor mounting base 22 and the circuit board mounting base 32 are matched, so that after the circuit board is placed in the circuit board mounting base 32, the magnetic angle encoder 14 on the circuit board is on the axis of the motor rotor 16.
[0044] Furthermore, the guide rail 13 is also provided with an encoder mounting slider 41, and the encoder mounting slider 41 is provided with an encoder mounting base. The encoder mounting base includes a connecting base part connected to the slider, an extension part connected to the connecting base part, and a mounting hole 42 provided on the extension part. The encoder can be fixed in position through the mounting hole 42.
[0045] In this embodiment, as Figure 1 As shown, the encoder mounting slider 41 is used to mount the encoder, which is connected to the motor rotor 16. It is used to obtain the rotation angle of the motor rotor 16 and compare it with the rotor rotation angle obtained by the magnetic angle encoder 14 to determine the accuracy of the magnetic angle encoder 14.
[0046] Furthermore, the servo valve motor test fixture also includes a coupling 18 for connecting the motor and the encoder. One end of the coupling 18 is connected to the shaft of the encoder, and the other end of the coupling 18 is connected to the motor rotor 16.
[0047] In the specific implementation process, the operation procedure of the servo valve motor fixture is as follows:
[0048] Step 1: Initial Static Calibration
[0049] The encoder is mounted on the top encoder mount, the circuit board mount 32 is mounted in the middle, and the circuit board mount 32 is mounted at the bottom. The manual coarse adjustment knob 17 is used to connect the motor rotor 16 and the encoder via the coupling 18. After confirming the position, the encoder mounting slider 41 and the motor mounting slider 21 are locked. The position of the circuit board mounting slider 31 is adjusted so that the top of the magnetic angle encoder 14 on the circuit board is close to the distance between the magnets at the bottom of the motor rotor 16, and then the circuit board mounting slider 31 is locked.
[0050] Step 2: Fine-tuning and compensation during operation:
[0051] Start the motor to the rated speed, and adjust the gap in real time using the knob 17 of the slider 31 mounted on the circuit board;
[0052] Dynamic adjustment: Based on feedback signals, the knob 17 is operated to compensate for the gap. For example, when the air gap shrinks by 0.1mm due to winding temperature rise, the fine-tuning knob 17 is shifted in the opposite direction by 0.1mm. If the gap is too large and the magnetic angle encoder 14 experiences packet loss, the distance is compensated by adjusting the knob 17. After changing the rotor's wrapping material, because different materials have different effects on magnetic field interference, the most suitable gap is found by adjusting the knob 17.
[0053] Step 3: Quick Lock and Verification:
[0054] After the adjustment meets the requirements, lock the position of the circuit board mounting slider 31;
[0055] Dynamic accuracy was verified using encoder signal quality analysis software.
[0056] Furthermore, the locking mechanism includes a screw passing through the slider and a rotating handle connected to the screw; the screw and the slider are connected by a thread, and the rotating handle can drive the screw to rotate, thereby causing the screw to pass through the slider and contact the guide rail 13 to lock the relative position of the slider and the guide rail 13.
[0057] In this embodiment, the locking mechanism uses a screw to lock the position of the slider. Rotating the operating handle controls the position of the screw in the threaded hole of the slider. Rotating the operating handle causes the screw to protrude from the threaded hole and contact the guide rail 13, increasing the friction between the screw and the guide rail 13 and thus achieving position locking. Rotating the operating handle in the opposite direction retracts the screw, allowing the slider to switch to a free state.
[0058] Furthermore, a scale is provided on the guide rail 13, which can be used to determine the distance between the motor mounting slider 21 and the circuit board mounting slider 31, and thus calculate the distance between the magnetic angle encoder 14 and the magnet at the bottom of the motor rotor 16.
[0059] In various embodiments of the present invention, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
[0060] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It is particularly important to note that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.
[0061] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
[0062] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A servo valve motor test fixture for real-time adjustment of the distance between a magnetic angle encoder (14) and the motor magnetic field during frameless motor operation, characterized in that: The servo valve motor test fixture includes a fixed base (11), a mounting bracket (12) set on the fixed base (11), a guide rail (13) set on the mounting bracket (12), a slider set on the guide rail (13), and a mounting seat set on the slider; The slider can move along the length of the guide rail (13). A locking mechanism is provided on the slider to lock the relative position of the slider and the guide rail (13). The guide rail (13) is provided with a motor mounting slider (21) and a circuit board mounting slider (31). The motor mounting slider (21) is provided with a motor mounting seat (22), and the circuit board mounting slider (31) is provided with a circuit board mounting seat (32). The motor mounting seat (22) and the circuit board mounting seat (32) are respectively provided with mounting positions for fixing the motor stator (15) and the circuit board. By adjusting the position of the circuit board mounting slider (31) and the circuit board mounting slider (31) on the guide rail (13), the relative distance between the magnetic angle encoder (14) on the circuit board and the motor magnetic field can be adjusted.
2. The servo valve motor test fixture according to claim 1, characterized in that: The guide rail (13) is a dovetail guide rail, which restricts the slider to move only along the length of the guide rail (13) and not to move or rotate in other directions.
3. A servo valve motor test fixture according to claim 1 or 2, characterized in that: A rack is provided on the guide rail (13), and a gear matching the rack is provided at the corresponding position inside the slider. A knob (17) that can drive the gear to rotate is also provided on the slider. Rotating the knob (17) can drive the gear to rotate, thereby finely adjusting the position of the slider on the guide rail (13).
4. A servo valve motor test fixture according to claim 1, characterized in that: The motor mounting base (22) and the circuit board mounting base (32) are detachably connected to the slider by fasteners; The motor mounting base (22) includes a connecting base part connected to the slider, an extension part connected to the connecting base part, and a clamp (23) provided on the extension part; the connecting base part is provided with fastener holes for detachable connection with the slider by fasteners, the extension part is used to adapt to different distances between the motor stator (15) and the guide rail (13), and the clamp (23) is used to fix the motor stator (15). The circuit board mounting base (32) includes a connecting base portion connected to the slider, an extension portion connected to the connecting base portion, and a mounting groove (33) provided on the extension portion; the mounting groove (33) matches the size of the circuit board, and the circuit board can be placed in the mounting groove. The magnetic angle encoder (14) on the circuit board faces the direction of the motor stator (15). The extension portion is used to adapt to different distances between the circuit board and the guide rail (13). The magnetic angle encoder (14) is located near the center of the motor rotor (16).
5. A servo valve motor test fixture according to claim 1, characterized in that: The guide rail (13) is also provided with an encoder mounting slider (41), and the encoder mounting slider (41) is provided with an encoder mounting seat. The encoder mounting seat includes a connecting seat part connected to the slider, an extension part connected to the connecting seat part, and a mounting hole (42) provided on the extension part. The encoder can be fixed in position through the mounting hole (42).
6. A servo valve motor test fixture according to claim 5, characterized in that: The servo valve motor test fixture also includes a coupling (18) for connecting the motor and the encoder. One end of the coupling (18) is connected to the shaft of the encoder, and the other end of the coupling (18) is connected to the motor rotor (16).
7. A servo valve motor test fixture according to claim 1, characterized in that: The locking mechanism includes a screw passing through the slider and a rotating handle connected to the screw; the screw and the slider are connected by a thread, and the rotating handle can drive the screw to rotate, thereby causing the screw to pass through the slider and contact the guide rail (13) to lock the relative position of the slider and the guide rail (13).
8. A servo valve motor test fixture according to claim 1, characterized in that: The guide rail (13) is equipped with a scale. The distance between the motor mounting slider (21) and the circuit board mounting slider (31) can be determined by the scale, and then the distance between the magnetic angle encoder (14) and the magnet at the bottom of the motor rotor (16) can be calculated.