A kind of magnetic suspension motor rotor position sensor installation calibration frock

Abstract

The application relates to a kind of magnetic suspension motor rotor position sensor installation calibration tool, belong to magnetic suspension motor technical field, it includes installation block, installation block is the arc-shaped plate shape of vertical arrangement, the shape of installation block is matched with rotor slot and is placed in rotor slot;The top of installation block is vertically connected with limit block, limit block protrudes inwards to installation block and is in contact with reflecting plate;Installation block is provided with radial avoiding slot in the position corresponding to radial installation hole and is provided with radial detection block, and there is a gap between the inner side wall of radial detection block and rotor slot;The bottom surface of installation block is provided with axial detection block, and there is a gap between the bottom surface of axial detection block and rotor slot.The scheme is simple in structure, simple in calibration mode, easy to operate, safe, reliable, high in efficiency, effectively solves the problem of magnetic suspension motor position sensor installation position deviation, effectively protects rotor and rotor slot.

Description

Technical Field

[0001] This invention belongs to the field of magnetic levitation motor technology, and specifically relates to a mounting and calibration fixture for a magnetic levitation motor rotor position sensor. Background Technology

[0002] An existing magnetic levitation motor (magnetic levitation switched reluctance motor) has the following structure: Figure 1 , Figure 2 As shown, it has a stator 17 and a rotor 16, wherein the rotor 16 is annular and is disposed in a rotor slot 1, with the stator 17 located outside the rotor slot 1. During operation, the rotor 16 rotates around its center. During rotation, the rotor 16 will vibrate axially and radially within a certain distance range within the rotor slot 1. A position sensor is required to monitor its position in real time. If any abnormality occurs, such as the vibration range of the rotor 16 exceeding the specified range, the position sensor will send a signal to the controller of the magnetic levitation motor to stop its operation.

[0003] In existing magnetic levitation motor structures, mounting holes (slots) are provided at the position sensor installation locations, typically for direct screw mounting. However, due to unavoidable errors in manufacturing and assembly, the installation position of the position sensor may deviate from its designed position, resulting in inaccurate measurement results. If this deviation exceeds a certain range, the aforementioned monitoring function cannot be effectively achieved, leading to malfunctions or even damage to the magnetic levitation motor. Therefore, the accuracy of the position sensor's installation position is crucial. The existing direct mounting method cannot determine whether the position sensor is installed accurately. Anomalies in the position sensor's measurements are usually only discovered during rotation testing after the rotor and related components have been installed, requiring position adjustments and repeated disassembly and reassembly adjustments—a time-consuming and labor-intensive process. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides a mounting and calibration fixture for a magnetic levitation motor rotor position sensor. This fixture calibrates the installation position of the position sensor after installation, improving the accuracy of the sensor's installation position and ensuring the normal operation of the magnetic levitation motor.

[0005] According to the technical solution of the present invention, the present invention provides a mounting and calibration fixture for a rotor position sensor of a magnetic levitation motor. The magnetic levitation motor has a stator, which is sleeved outside the rotor slot. A radial mounting hole is provided on the inner side wall of the rotor slot, and a radial position sensor is installed thereon. An axial mounting hole is provided at the bottom of the rotor slot, and an axial position sensor is installed thereon. A horizontally arranged reflector is located above the annular interior of the rotor slot. The fixture includes a mounting block, which is an upright arc-shaped plate. The shape of the mounting block matches the rotor slot and is placed in the rotor slot. A limiting block is vertically connected to the top of the mounting block. The limiting block protrudes inward from the mounting block and contacts the reflector. A radial clearance groove is provided on the mounting block at a position corresponding to the radial mounting hole, and a radial detection block is provided thereon. There is a gap between the radial detection block and the inner side wall of the rotor slot. An axial detection block is provided on the bottom surface of the mounting block, and there is a gap between the axial detection block and the bottom surface of the rotor slot.

[0006] Furthermore, a handle is provided on the top surface of the limiting block.

[0007] Furthermore, the mounting block and the limiting block are connected to each other on both sides by connecting screws.

[0008] Furthermore, a reflector clearance groove is provided at the upper end of the mounting block, and there is a gap between the reflector clearance groove and the reflector.

[0009] Furthermore, the mounting block has positioning beads on its outward-facing side, and the positioning beads are elastic or connected to the mounting block through elastic elements.

[0010] Furthermore, the positioning bead and the side of the mounting block opposite to the positioning bead both abut against the inner side of the rotor groove.

[0011] Furthermore, shims for adjusting and fixing the position are provided between the radial position sensor and the radial mounting hole, and between the axial position sensor and the axial mounting hole.

[0012] Furthermore, three sets of radial position sensors and axial position sensors are evenly distributed around the rotor slots.

[0013] Furthermore, the limiting block is made of a non-metallic soft material plate, at least on its lower surface that contacts the reflector.

[0014] Furthermore, both the radial and axial detection blocks are made of solution-treated SUS630 stainless steel, and the surface roughness of the sides of the radial and axial detection blocks facing the radial and axial position sensors is less than Ra0.8.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] 1. The magnetic levitation motor rotor position sensor installation and calibration fixture of the present invention has a simple structure, a convenient calibration method, and is easy to operate. It effectively solves the problem of position deviation in the installation of the magnetic levitation motor position sensor, avoids the situation where the rotor vibrates strongly in the rotor slot due to inaccurate installation of the position sensor and the controller fails to stop the operation in time, and effectively protects the rotor and the rotor slot.

[0017] 2. The magnetic levitation motor rotor position sensor installation and calibration fixture of the present invention can complete the calibration of the position sensor installation position before the rotor is installed and the rotation test is performed, which is safe, reliable and efficient.

[0018] 3. The magnetic levitation motor rotor position sensor installation and calibration fixture of the present invention can perform axial and radial calibration simultaneously, avoiding inaccurate calibration caused by multiple positioning, while saving time and improving efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of some components of a magnetic levitation motor involved in this invention.

[0020] Figure 2 This is a cross-sectional schematic diagram of the rotor slot of a magnetic levitation motor involved in this invention.

[0021] Figure 3 This is a three-dimensional structural schematic diagram of a tooling according to an embodiment of the present invention.

[0022] Figure 4 yes Figure 3 A three-dimensional structural diagram of the tooling shown from another angle.

[0023] Figure 5 yes Figure 3 The diagram shows a cross-sectional view of the tooling in use.

[0024] Figure 6 yes Figure 3 The diagram shows the three-dimensional structure of the tooling in use.

[0025] Figure 7 yes Figure 6 A three-dimensional structural diagram of the structure shown from another angle.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Rotor slots;

[0028] 2. Radial mounting holes;

[0029] 3. Radial position sensor;

[0030] 4. Axial mounting holes;

[0031] 5. Axial position sensor;

[0032] 6. Reflector;

[0033] 7. Installation block;

[0034] 8. Limit block;

[0035] 9. Radial clearance groove;

[0036] 10. Radial detection block;

[0037] 11. Axial detection block;

[0038] 12. Positioning beads;

[0039] 13. Gaskets;

[0040] 14. Handle;

[0041] 15. Connecting screws;

[0042] 16. Rotor;

[0043] 17. Stator;

[0044] 18. Cylindrical parts and limiting ejector pins;

[0045] 19. Reflector clearance groove. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0047] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0048] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0049] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0050] This invention relates to a mounting and calibration fixture for a rotor position sensor of a magnetic levitation motor, belonging to the field of magnetic levitation motor technology. It includes a mounting block, which is an upright, arc-shaped plate whose shape matches the rotor slot and is placed within it. A limiting block is vertically connected to the top of the mounting block, protruding inward and abutting a reflector. A radial clearance groove is formed on the mounting block at a position corresponding to a radial mounting hole, and a radial detection block is provided therein, with a gap between the radial detection block and the inner sidewall of the rotor slot. An axial detection block is provided on the bottom surface of the mounting block, with a gap between the axial detection block and the bottom surface of the rotor slot. This solution features a simple structure, convenient and easy calibration method, safety, reliability, and high efficiency, effectively solving the problem of installation position deviation of the magnetic levitation motor position sensor and effectively protecting the rotor and rotor slot.

[0051] Please refer to the following first. Figure 1 , Figure 2 This invention relates to a magnetic levitation motor (magnetic levitation switched reluctance motor), which has an annular stator 17 fitted around the outside of a rotor slot 1 (chamber bottom). The rotor slot 1 is a downwardly recessed annular slot. Radial mounting holes 2 are provided on the inner sidewall of the rotor slot 1, and radial position sensors 3 are mounted thereon. Axial mounting holes 4 are provided at the bottom of the rotor slot 1, and axial position sensors 5 are mounted thereon. Three sets of radial position sensors 3 and axial position sensors 5 are evenly distributed around the circumference of the rotor slot 1. Both radial position sensors 3 and axial position sensors 5 are connected to a matching box of the magnetic levitation motor via wires. The matching box is further connected to the controller of the magnetic levitation motor, and the controller is then connected to an external computer device to transmit detection signals. In operation, an annular rotor 16 is provided in the rotor slot 1. Four cylindrical parts and limiting pins 18 (part of the rotor 16 in the prior art) are evenly distributed axially on the rotor 16. A horizontally arranged reflector plate 6 is located above the inner side of the annular rotor slot 1. This type of magnetic levitation motor is existing technology; therefore, only some parts around the tooling of this invention will be described here, and the rest of the structure will not be elaborated. It is understood that the structure and application scope of this invention are not limited thereto, and any motor with a similar annular rotor and sensor can be applied.

[0052] Please see Figures 3 to 7The present invention provides a mounting and calibration fixture for a magnetic levitation motor rotor position sensor, comprising a mounting block 7, which is an upright, arc-shaped plate. The shape of the mounting block 7 matches the rotor slot 1 and is inserted into the rotor slot 1 during installation and calibration. A limiting block 8 is vertically connected to the top of the mounting block 7. The limiting block 8 protrudes inward from the mounting block 7 and fits against a reflector plate 6, resting on the reflector plate 6. A radial clearance groove 9 is provided on the mounting block 7 at a position corresponding to the radial mounting hole 2, and a radial detection block 10 is provided therein. The radial clearance groove 9 creates a gap between the radial detection block 10 and the inner sidewall of the rotor slot 1, so that the radial detection block 10 will not directly contact the radial position sensor 3 and cause damage. Similarly, an axial detection block 11 is provided on the bottom surface of the mounting block 7. The axial detection block 11 has a gap with the bottom surface of the rotor slot 1, so that it does not contact the axial position sensor 5.

[0053] like Figure 3 , 4 In the preferred embodiment shown, a handle 14 is provided on the top surface of the limiting block 8. The handle 14 includes a rod-shaped connecting section and a rotating handle at the top. The outer side of the rotating handle has anti-slip texture (e.g., knurling), which facilitates the insertion and removal of the tooling into the rotor slot 1 by holding the handle 14.

[0054] The limiting block 8 is used for axial positioning of this fixture. Since the limiting block 8 directly contacts the relatively smooth surface of the reflector plate 6, there are requirements regarding the material of the limiting block 8. At least the lower surface of the limiting block 8 in contact with the reflector plate 6 must be made of a non-metallic soft material such as PI, PEEK, PTFE, or nylon. The limiting block 8 can be made entirely of such materials, or only in the contact area. This ensures that the limiting block 8 will not damage the surface of the reflector plate 6 when in contact with it. Both the mounting block 7 and the limiting block 8 have connecting holes on both sides (at least the connecting holes on the mounting block 7 are screw holes) and are connected by connecting screws 15, achieving a tight connection between the non-metallic limiting block 8 and the metallic mounting block 7, while also allowing for disassembly and replacement. For a more preferred embodiment, please refer to [further details omitted]. Figure 5 The upper end of the mounting block 7 is provided with a reflector clearance groove 19, and there is a gap between the reflector clearance groove 19 and the reflector 6, so that the side of the reflector 6 will not be damaged during installation and use.

[0055] The mounting block 7 has a positioning bead 12 on its outward-facing side. The positioning bead 12 is elastic or connected to the mounting block 7 through an elastic element. Utilizing its elasticity, the force can be adjusted according to the actual use, so that the positioning bead 12 and the side of the mounting block 7 opposite to the positioning bead 12 abut against the inner side of the rotor slot 1, thereby ensuring that the tooling is stably and accurately positioned in the rotor slot 1.

[0056] The side of the mounting block 7 opposite to the positioning bead 12 refers to the protrusion formed by the radial clearance groove 9 (and the reflector clearance groove 19). Specifically, the positioning bead 12 has a positioning groove in the mounting block 7, within which a rigid positioning bead 12 is placed. The positioning bead 12 is connected to the bottom surface of the inner side of the positioning groove by a spring, thus allowing for... Figure 4 As shown, the positioning groove is through, and the spring is fixed inside the mounting block 7 by screws to achieve a detachable connection for easy adjustment and replacement of parts; or the positioning bead 12 is made of an elastic material, relying on its own elasticity to achieve the above effect.

[0057] Mounting block 7 is made of metal, preferably USU304, but 7075, 6061, or other aluminum materials can also be used. The two arc dimensions of mounting block 7 correspond to the inner and outer diameter dimensions of rotor 16, respectively. Radial detection block 10 and axial detection block 11 are located at the lower part of mounting block 7. These two are the most important parts of the entire calibration fixture, and their materials have special requirements. Preferably, for example, the radial detection block 10 and axial detection block 11 are both made of SUS630 stainless steel and require solution treatment. The surface roughness of the sides of radial detection block 10 and axial detection block 11 facing radial position sensor 3 and axial position sensor 5 is less than Ra0.8. Radial detection block 10 and axial detection block 11 can be set separately or can be a single detection block, with the detection surfaces being the two surfaces of the detection block.

[0058] Please see Figure 6 , Figure 7 The sensor and rotor slot 1 are generally fixed together by screws, for example, screw holes are provided on both sides of the sensor and the corresponding mounting hole. Based on this structure, one way to adjust the installation position of each sensor is as follows: metal shims 13 for adjusting the fixed position are provided between the radial position sensor 3 and its installation position (radial mounting hole 2), and between the axial position sensor 5 and its installation position (axial mounting hole 4). For example, through holes are provided on both sides of the shim 13, which correspond to the screw holes on both sides of the sensor and the mounting hole, so that the installation height position of each sensor can be adjusted by adding shims 13 of different thicknesses or in different numbers.

[0059] The method of use and principle of this invention are as follows:

[0060] 1. Similar to the existing process, install each sensor in each mounting hole.

[0061] 2. Place this fixture in the corresponding position within the rotor slot 1 to simulate the standard position of the rotor 16. During placement, the lower surface of the limiting block 8 should be flush with and parallel to the reflector plate 6, ensuring that the radial detection block 10 and axial detection block 11 completely cover the detection positions of the radial position sensor 3 and axial position sensor 5. Figure 6 , Figure 7 As shown (the location data measured by the sensor indicates whether it is completely covered).

[0062] 3. Connect the controller of the magnetic levitation motor to the external computer device (computer) for debugging; open the debugging software (existing software); the debugging software reads the position data measured by each sensor every once in a while and displays it.

[0063] 4. After the data collection of a set of radial position sensors 3 and axial position sensors 5 in the same circumferential position is completed, adjust the position of this fixture and collect data of the other two sets of sensors in turn. By comparing the data values ​​of the three radial position sensors 3, the position of the three radial position sensors 3 can be determined according to the size of the difference (i.e., whether they are installed on the concentric circles of the rotor slot 1). Similarly, the position of the axial position sensor 5 can also be determined (i.e., whether it is installed on the same horizontal plane).

[0064] 5. If the position is inaccurate, adjust the installation height of the corresponding sensor by adjusting the shims 13 until the data values ​​of the three radial position sensors 3 are basically the same (the difference is within a certain range) and the data values ​​of the three axial position sensors 5 are basically the same (the difference is within a certain range). Then the sensor position is accurate and meets the requirements, and the calibration is completed.

[0065] More specifically, in a conventional magnetic levitation motor, the sensors are arranged in three groups at 120° intervals around the circumference. Each group includes one radial position sensor 3 and one axial position sensor 5 (of course, this fixture can also be used to calibrate magnetic levitation motors with four or more groups of sensors). During calibration, the fixture is placed at the position of one group of sensors, and the stabilized data values ​​of these two sensors are read and recorded. Then, the installation position of the fixture is changed, and the data values ​​of the other two groups of sensors are measured. That is, three measurements are required to obtain the data values ​​of the three radial position sensors 3 and the three axial position sensors 5. Finally, the data values ​​of the three radial position sensors 3 and the three axial position sensors 5 are compared. Based on experience, the position is considered to be accurately installed if the difference between any two data values ​​of the three radial position sensors 3 and the difference between any two data values ​​of the three axial position sensors 5 is within 3000; otherwise, adjustments are required.

[0066] In summary, the tooling of this invention allows for the installation of the rotor 16 after calibration, eliminating the hassle of repeated disassembly and debugging required by existing technologies and ensuring the accuracy of sensor installation. During the operation of the magnetic levitation motor, each sensor monitors in real time; if the position data measured by the three radial position sensors 3 are within the set reasonable range, it indicates that the rotor 16 is basically centered; similarly, if the measured values ​​of the three axial position sensors 5 are within the set reasonable range, it indicates that the rotor 16 is basically level; if any sensor's measured value exceeds the reasonable range, it indicates that the rotor 16 is vibrating too much, and the position sensor sends a signal to the controller of the magnetic levitation motor to stop its operation, protecting the equipment safety.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not 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; and these 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 magnetic levitation motor rotor position sensor installation calibration tool, the magnetic levitation motor having a stator (17) sleeved on a rotor slot (1), a radial installation hole (2) and a radial position sensor (3) being arranged on the inner side wall of the rotor slot (1), an axial installation hole (4) and an axial position sensor (5) being arranged on the bottom of the rotor slot (1), and a reflective plate (6) being arranged horizontally above the inner side of the rotor slot (1); the tool comprises an installation block (7) arranged vertically as an arc-shaped plate, the shape of the installation block (7) being matched with the rotor slot (1) and being placed in the rotor slot (1); a limiting block (8) being connected perpendicularly to the top of the installation block (7), the limiting block (8) protruding inwardly from the installation block (7) and being in contact with the reflective plate (6); a radial avoiding slot (9) being arranged in the installation block (7) at a position corresponding to the radial installation hole (2) and a radial detection block (10) being arranged in the installation block (7), the radial detection block (10) having a gap with the inner side wall of the rotor slot (1); an axial detection block (11) being arranged on the bottom surface of the installation block (7), the axial detection block (11) having a gap with the bottom surface of the rotor slot (1); a gasket (13) being arranged between the radial position sensor (3) and the radial installation hole (2) and between the axial position sensor (5) and the axial installation hole (4) for adjusting the fixed position; the radial position sensor (3) and the axial position sensor (5) being evenly distributed with three groups in the circumferential direction of the rotor slot (1); a handle (14) being arranged on the top surface of the limiting block (8); the installation block (7) and the limiting block (8) being connected by connecting screws (15) at both sides; a reflective plate avoiding slot (19) being arranged in the upper end of the installation block (7), the reflective plate avoiding slot (19) having a gap with the reflective plate (6); a positioning bead (12) being arranged on the outward side of the installation block (7), the positioning bead (12) being connected with the installation block (7) by elasticity or an elastic member; the positioning bead (12) and the side of the installation block (7) opposite to the positioning bead (12) being in contact with the inner side of the rotor slot (1); the limiting block (8) being made of a non-metallic soft material plate at least on the lower surface in contact with the reflective plate (6); the materials of the radial detection block (10) and the axial detection block (11) being solid solution treated SUS630 stainless steel, the roughness of the side of the radial detection block (10) and the axial detection block (11) facing the radial position sensor (3) and the axial position sensor (5) being less than Ra0.

8. characterized in that ​ ​ ​ 2. The magnetic levitation motor rotor position sensor installation calibration fixture of claim 1, wherein, ​ 3. The magnetic levitation motor rotor position sensor installation calibration fixture of claim 1, wherein, ​ 4. The magnetic levitation motor rotor position sensor installation calibration fixture of claim 1, wherein, ​ 5. The magnetic levitation motor rotor position sensor installation calibration fixture of claim 1, wherein, ​ 6. The magnetic levitation motor rotor position sensor installation calibration fixture of claim 5, wherein, ​ 7. The magnetic levitation motor rotor position sensor installation calibration fixture of any of claims 1-6, wherein, ​ 8. The magnetic levitation motor rotor position sensor installation calibration fixture of any one of claims 1-6, wherein, ​

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