Detection tool, detection method and application of ac / dc resistance difference of magnetic bearing coil

Abstract

This application discloses a fixture, method, and application for detecting the AC / DC resistance difference of a magnetic bearing coil, belonging to the field of magnetic levitation molecular pump coil testing. Its key technical features include: a placement assembly for holding and fixing the coil to be tested; a left clamp assembly and a right clamp assembly for driving the LCR measuring instrument to clamp / release the two leads of the coil to be tested, used to measure the AC equivalent resistance R of the coil to be tested. s and the DC resistance R of the coil dc The LCR measuring instrument of this application. The technical solution adopted in this application can solve the problem of electrical performance asymmetry in paired coils caused by oxidation of the reference material, thereby improving the operational reliability of the magnetic bearing.

Description

Technical Field

[0001] This application relates to the field of testing magnetic levitation molecular pump coils, and more specifically, to a tooling, testing method, and application for detecting the AC / DC resistance difference of a magnetic bearing coil. Background Technology

[0002] like Figure 1 As shown, a magnetic bearing typically consists of eight coils. These are paired up to form four pairs of magnetic poles, used to control the levitation force in two orthogonal radial directions. Each coil is usually wound with copper wire of 0.1mm to 0.2mm in diameter. As described in CN117038323A, during the production of the magnetic bearing coil, the insulating varnish layer on the lead wires at the ends of the magnetic bearing coil needs to be stripped to facilitate connection with external circuitry. However, the stripped lead wire ends are highly susceptible to oxide formation.

[0003] like Figure 1 When pairing coils 1 and 2 as shown, one lead of coil 1 and one lead of coil 2 need to be soldered together to connect them in series. If an oxide layer exists on one lead of coil 1 or one lead of coil 2, the following problem will occur: (1) When severely oxidized, the heat generated during operation increases due to the increased contact resistance of the welding point, which in turn leads to a decrease in system efficiency.

[0004] (2) When severely oxidized, the solder cannot form a good intermetallic compound with the copper substrate, which leads to poor soldering. Long-term operation of the coil under these conditions may cause poor contact and affect the operational reliability of the magnetic bearing.

[0005] (3) The electrical performance of the two paired coils must be highly symmetrical to ensure the uniformity of the levitation force and the control accuracy. However, if the oxide layer thickness of the two paired coils is different, it will lead to inconsistent contact resistance of the solder joint, which will destroy the electrical symmetry of the coils, reduce the control performance of the magnetic bearing, and even cause system instability.

[0006] In actual production, the following problems are encountered: (1) How to detect the oxidation level of the coil leads. Since the coil leads need to be soldered later, the SEM method (which requires cutting the leads) cannot be used for detection.

[0007] (2) How to treat leads with different oxidation levels. Coil leads have varying degrees of oxidation, and leads with different oxidation levels should be treated differently. Summary of the Invention

[0008] The purpose of this application is to provide a tooling for detecting the AC / DC resistance difference of a magnetic bearing coil, addressing the shortcomings of the prior art.

[0009] Another objective of this application is to provide a method for detecting the AC / DC resistance difference of a magnetic bearing coil.

[0010] Another objective of this application is to provide an application of a method for detecting the AC / DC resistance difference of a magnetic bearing coil.

[0011] The technical solution of this application is as follows: A fixture for detecting the AC / DC resistance difference of a magnetic bearing coil, comprising: a. A placement assembly for placing and fixing a coil to be tested; it includes: a test placement plate and a test insertion seat and a coil fixing component disposed on the test placement plate; the coil fixing component includes: a limiting baffle and a limiting baffle longitudinal movement driving component for driving the limiting baffle to move longitudinally; when placing the coil to be tested, the coil to be tested is placed on the test placement plate and the test insertion seat is inserted into the hollow center of the coil to be tested; the limiting baffle longitudinal movement driving component drives the limiting baffle to move, and the limiting baffle and the test insertion seat clamp the coil to be tested; b. The left clamp assembly and the right clamp assembly are used to drive the test clamps on both sides of the LCR measuring instrument to clamp / release the two leads of the coil to be tested; c. LCR meter, which is used to measure the AC equivalent resistance R of the coil under test. s and the DC resistance R of the coil dc .

[0012] Furthermore, there are multiple detection insertion seats, and the coil fixing component includes multiple limiting baffles and a limiting baffle longitudinal movement driving component that drives the multiple limiting baffles to move longitudinally together; the detection insertion seats correspond one-to-one with the limiting baffles, and the multiple detection insertion seats and their corresponding limiting baffles are used to detect different types of coils to be tested.

[0013] Furthermore, the placement assembly also includes: a placement plate lateral movement driving component; the placement plate lateral movement driving component is capable of driving the detection placement plate to move laterally.

[0014] Furthermore, the left and right clamping assemblies have the same structure, both including: clamping base plate, transverse track plate, loading plate, transverse pushing component, gripper driving component, upper gripper, and lower gripper; The transverse track plate is fixedly mounted on the base plate of the clamp, and the loading plate is movably mounted on the transverse track plate. The lateral pushing component is used to drive the carrier plate to translate laterally; a gripper driving component is fixedly provided on the upper side of the carrier plate, and the gripper driving component is used to drive the upper gripper to approach / separate from the lower gripper. Both the upper and lower grippers are insulators. The upper clamp is located below the upper jaw, and the lower clamp is located above the lower jaw. The upper clamp and the lower clamp together form the test clamp on one side of the LCR measuring instrument.

[0015] Furthermore, the upper clamp and the upper jaw are connected by a spring, and the lower clamp is fixedly mounted on the upper surface of the lower jaw.

[0016] Furthermore, the upper and lower jaws of the left clamping assembly and the upper and lower jaws of the right clamping assembly are staggered in the longitudinal direction.

[0017] Furthermore, the AC / DC resistance difference detection fixture for the magnetic bearing coil also includes a collaborative robot; the operating end of the collaborative robot includes two grippers and a wire splitting mechanism; the two grippers are used to grip the coil to be tested; the wire splitting mechanism is used to increase the distance between the two leads of the coil to be tested.

[0018] Furthermore, the AC / DC resistance difference detection fixture for the magnetic bearing coil also includes: f, feeding assembly, which is used to place the coil to be tested; g, feeding assembly, which is used to collect qualified coils; h, Disposal box, which is used to collect defective coils.

[0019] A method for detecting the AC / DC resistance difference of a magnetic bearing coil includes the following steps: S100, Placing the coil to be tested: The collaborative robot takes a coil to be tested from the loading tray and places it on the testing placement plate, so that the testing insertion seat is inserted into the hollow center of the coil to be tested; then, the collaborative robot separates from the coil to be tested, and the limiting baffle longitudinal movement driving component drives the limiting baffle to move, clamping the coil to be tested through the limiting baffle and the testing insertion seat; S200, the placement plate transverse movement drive component is activated, driving the detection placement plate and the coil to be detected to the predetermined detection position; S300, wire splitting operation: The wire splitting mechanism of the collaborative robot is inserted into the gap between the two leads of the coil to be tested. The collaborative robot moves left and right in turn to split the two leads of the coil to be tested into a figure-eight shape. Then, the collaborative robot separates from the coil to be tested. S500, the left clamp assembly and the right clamp assembly drive the test clamp of the LCR measuring instrument to move toward and clamp the two leads of the coil to be tested; The S600 LCR meter measures and obtains the AC / DC resistance difference ΔR; it includes the following sub-steps: S601, set to 1kHz series mode, measure AC equivalent resistance R s ; S602, then switch the LCR meter to DC Rdc mode and measure the coil DC resistance R. dc ; S603, Solve for the AC / DC resistance difference ΔR, ΔR = R s -R dc ; S700, after the measurement is completed, the left clamp assembly and the right clamp assembly return to their initial state; the upper and lower jaws of the left clamp assembly and the right clamp assembly move away from each other and then move away from the two leads of the coil to be measured; S800, if ΔR≤0.004Ω, the collaborative robot places the coil to be tested into the Class A area of ​​the unloading tray in the unloading assembly. If 0.004Ω<ΔR≤0.010Ω, the collaborative robot places the coil to be tested into the B-type product area of ​​the unloading tray in the unloading assembly; If ΔR > 0.010Ω, the collaborative robot places the coil to be tested into the throwing box.

[0020] An application of a method for detecting the AC / DC resistance difference of a magnetic bearing coil, which is used for detecting and treating the oxidation level of the magnetic bearing coil, is characterized in that the aforementioned method for detecting the AC / DC resistance difference of the magnetic bearing coil is used to obtain its AC / DC resistance difference ΔR. If ΔR > 0.010Ω, the coil is a defective product, cannot meet the oxidation requirements, and is prohibited from being used for subsequent welding. If ΔR≤0.004Ω, the coil is in normal condition, meets the oxidation requirements, and can be used directly for subsequent welding. If 0.004Ω < ΔR ≤ 0.010Ω, the coil is classified as a process warning level and requires enhanced deoxidation treatment before subsequent welding.

[0021] Furthermore, the enhanced deoxidation treatment refers to extending the immersion time of the leads in the solder pot (or tinning with a soldering iron) from the conventional 2-3 seconds to 5-8 seconds, using the scouring effect of the high-temperature molten solder and thermal stress to cause the oxide layer to crack and fall off.

[0022] The beneficial effects of this application are as follows: (1) It is difficult to measure the oxide layer thickness directly in a non-destructive manner for coil leads. This application proposes for the first time an evaluation index for evaluating the degree of oxidation of coil leads: AC / DC resistance difference ΔR.

[0023] ΔR can be used as an indirect indicator for evaluating the degree of oxidation, and it can also serve as one of the indicators for evaluating the electrical symmetry of the coil. By detecting these indicators, the oxidation level of magnetic bearing coils can be detected and addressed. Specifically, it can be divided into: Category 1, Normal Level: ΔR≤0.004Ω. No obvious oxidation at the wire ends, excellent coil condition, and standard soldering procedures are sufficient for long-term use.

[0024] Category 2, Process Warning Level: 0.004Ω<ΔR≤0.010Ω. The lead has a slight solderability oxide layer, passes DC test, and has no inherent defects, but there is a slight additional loss at high frequency; the system automatically issues a warning: the operator extends the soldering tinning time by 30% and strengthens the wetting and deoxidation (gently swinging or rotating the lead) to completely eliminate interface hazards.

[0025] Category 3, Severe Defect Level: ΔR > 0.010Ω. The oxidation level exceeds the standard, and the interface defects cannot be completely eliminated by conventional welding. This is considered a process defect and is prohibited from proceeding to the welding process; rework is required immediately.

[0026] (2) This application proposes a fixture for detecting the AC / DC resistance difference of a magnetic bearing coil. Its key design addresses the following three issues: 2.1 How to fix the coil to be tested. "A test placement plate and a test insertion seat and a coil fixing component disposed on the test placement plate; the coil fixing component includes: a limiting baffle corresponding to the test insertion seat and a limiting baffle longitudinal movement driving component that drives the limiting baffle to move longitudinally." During fixing, the test insertion seat is inserted into the hollow center of the coil to be tested, and the limiting baffle longitudinal movement driving component drives the limiting baffle to move, clamping the coil to be tested between the limiting baffle and the test insertion seat.

[0027] 2.2 How to clamp two leads. "An upper clamp is positioned below the upper jaw, and a lower clamp is positioned above the lower jaw; the upper and lower clamps constitute a test clamp on one side of the LCR measuring instrument." "The lateral pushing component is used to drive the carrier plate to move laterally." "A jaw driving component is fixedly mounted on the upper side of the carrier plate; the jaw driving component is used to drive the upper and lower jaws to approach / separate; wherein, both the upper and lower jaws are insulators." During operation, initially, both the left and right clamping assemblies are in the open state; then, the two clamping assemblies move towards their respective leads; then, the upper and lower jaws approach each other, causing the upper and lower clamps to clamp the leads.

[0028] 2.3 The distance between the leads of the magnetic bearing coil under test is relatively small. How can the test clamps on both sides of the LCR measuring instrument clamp / release the two leads of the coil under test? To solve the above problem, the following design is adopted: i. "The upper and lower jaws of the left clamping assembly and the upper and lower jaws of the right clamping assembly are staggered in the longitudinal direction." Figure 7 The upper and lower jaws of the left clamping assembly are close to the placement assembly, while the upper and lower jaws of the right clamping assembly are far from the placement assembly. This front-to-back design avoids collisions between the jaws of the left and right clamping assemblies. ii. “The collaborative robot 1400 is equipped with a wire splitting mechanism 1420 at its operating end.” During operation, the wire splitting mechanism 1420 is inserted between the two leads of the coil to be tested 2000. The collaborative robot 1400 moves to the left and then to the right to split the two leads of the coil to be tested 2000 into a figure-eight shape. Attached Figure Description

[0029] The present application will be further described in detail below with reference to the embodiments in the accompanying drawings, but this does not constitute any limitation on the present application.

[0030] Figure 1 This is a planar distribution diagram of existing magnetic bearing coils.

[0031] Figure 2 This is a three-dimensional structural schematic diagram of the AC / DC resistance difference detection fixture for the magnetic bearing coil of this application.

[0032] Figure 3 This is a three-dimensional structural diagram of the placement component of this application.

[0033] Figure 4 This is a three-dimensional structural diagram of the placement component of this application from another perspective.

[0034] Figure 5 This is a schematic diagram showing the connection relationship between the test placement plate, the test insertion seat, and the coil fixing component in this application.

[0035] Figure 6 This is a three-dimensional structural diagram of the placement component of this application from another perspective.

[0036] Figure 7 This is a three-dimensional structural diagram of the left clamp assembly and the right clamp assembly of this application.

[0037] Figure 8 This is a three-dimensional structural schematic diagram of the right clamp assembly of this application.

[0038] Figure 9 This is a schematic diagram showing the connection relationship between the upper jaw, lower jaw, upper clamp, and lower clamp of this application.

[0039] Figure 10 This is a three-dimensional structural diagram of the feeding component and the unloading component of this application.

[0040] Figure 11This is a three-dimensional structural diagram of the operating end of the collaborative robot of this application.

[0041] Figure 12 This is a top view of the AC / DC resistance difference detection fixture for the magnetic bearing coil of this application.

[0042] The annotations in the attached figures are explained as follows: 1000-type fixture for detecting the AC / DC resistance difference of magnetic bearing coils; Placement component 1100, detection placement plate 1110, detection insertion seat 1120, coil fixing component 1130, limit baffle 1131, limit baffle longitudinal movement drive component 1132, placement plate transverse movement drive component 1140.

[0043] Left clamp assembly 1200; Right clamp assembly 1300, clamp base plate 1310, transverse track plate 1320, transverse pushing component 1330, loading plate 1340, gripper driving component 1350, upper gripper 1360, lower gripper 1370, upper clamp 1380, lower clamp 1390; Collaborative robot 1400, collaborative robot gripper 1410, and line-separating operation mechanism 1420; Workstation plate 1500; Feeding component 1600, feeding tray 1610, servo feeding mechanism 1620; Material feeding assembly 1700, material feeding tray 1710, servo material feeding mechanism 1720; Disposal box 1800; The coil to be tested is 2000. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] <Technical Route> The leads have very small diameters, minimal oxide thickness, and require non-destructive testing. Therefore, common methods such as SEM, eddy current sensors, and optical analysis are not suitable.

[0046] During production, the R&D team discovered that using the AC / DC resistance difference ΔR (ΔR = R)... s -R dcThere is a significant monotonically positive correlation between ΔR and the degree of oxidation (the larger the ΔR, the more severe the oxidation), which can be used to evaluate the oxidation degree of the coil. Based on ΔR, the coil lead condition is divided into three levels, each corresponding to a different processing method: Category 1, Normal Grade (Class A): ΔR≤0.004Ω. No obvious oxidation at the wire ends, excellent coil condition, and standard soldering procedures are sufficient for long-term use.

[0047] Category 2, Process Warning Level (Class B): 0.004Ω < ΔR ≤ 0.010Ω. The leads have a slight solderability oxide layer, pass DC testing, and have no inherent defects, but there is a slight additional loss at high frequencies; the system automatically issues a warning: the operator extends the soldering tinning time by 30%, strengthens wetting and deoxidation, and completely eliminates interface hazards.

[0048] Category 3, Severe Defect Level: ΔR > 0.010Ω. The oxidation level exceeds the standard, and the interface defects cannot be completely eliminated by conventional welding. This is considered a process defect and is prohibited from proceeding to the welding process; rework is required immediately.

[0049] It should be noted that: R s R dc Test method: At 25°C, the two test clips of the LCR measuring instrument (HIOKI-IM3533) are respectively clamped to the two leads of the magnetic bearing coil. The 1kHz series mode is set, and the AC equivalent resistance R is measured. s Then switch the LCR meter to DC Rdc mode and measure the DC resistance R of the coil. dc .

[0050] It should be noted that this application applies to enameled copper wires with a diameter of 0.1 to 0.2 mm.

[0051] <Example 1> A magnetic bearing coil testing fixture 1000 based on LCR AC / DC differential includes: a. Placement component 1100, which is used to fix the coil to be tested 2000 and move it to a preset position; b. The left clamp assembly 1200 and the right clamp assembly 1300 are respectively used to drive the test clamps on both sides of the LCR measuring instrument to clamp / release the two leads of the coil to be tested 2000; c, LCR measuring instrument, which is used to test the coil 2000 to be tested; d, Collaborative robot 1400, which is used to move the coil to be tested 2000; e. Workstation plate 1500 serves as a fixing plate for placing assembly 1100, left clamp assembly 1200, right clamp assembly 1300, and throwing box 1800; loading port and unloading port are provided on workstation plate 1500 at positions corresponding to loading assembly 1600 and unloading assembly 1700. f, Feeding assembly 1600, which is used to place the coil to be tested 2000; g, feeding assembly 1700, which is used to collect qualified coils; h, Disposal box 1800, which is used to collect defective coils.

[0052] Figures 3-6 The three-dimensional structure of the placement component 1100 is illustrated from different angles. The placement component 1100 includes: a detection placement plate 1110, a detection insertion seat 1120, a coil fixing component 1130, and a placement plate lateral movement drive component 1140. The connection relationship of the above components is as follows: i. The detection insertion seat 1120 is provided on the detection placement plate 1110; ii. A coil fixing member 1130 corresponding to the detection insertion seat is provided on the detection insertion seat 1120; the coil fixing member 1130 includes: a limiting baffle 1131 and a limiting baffle longitudinal movement driving member 1132 for driving the limiting baffle 1131 to move longitudinally.

[0053] like Figure 5 As shown, the coil to be tested 2000 is placed on the detection placement plate 1110 and the detection insertion seat 1120 is inserted into the hollow center of the coil to be tested 2000; the limiting baffle longitudinal movement driving member 1132 drives the limiting baffle 1131 to move, and the limiting baffle 1131 and the detection insertion seat 1120 clamp the coil to be tested 2000.

[0054] It should be noted that, in Figure 5 The diagram illustrates that three different detection insertion seats 1120 are provided on the detection placement plate 1110. Correspondingly, three limiting baffles are provided on the coil fixing member 1130, which are corresponding to the detection insertion seats 1120. All three limiting baffles are fixed to the limiting baffle longitudinal movement driving member 1132, that is, all three limiting baffles are driven to move by the same limiting baffle longitudinal movement driving member 1132.

[0055] Figure 7 The structure of the left clamp assembly 1200 and the right clamp assembly 1300 is shown. Figure 8 The structural design of the right clamp assembly 1300 is illustrated.

[0056] The right clamp assembly 1300 includes: a clamp base plate 1310, a transverse track plate 1320, a loading plate 1340, a transverse pushing component 1330, a gripper driving component 1350, an upper gripper 1360, and a lower gripper 1370. The transverse track plate 1320 is disposed on the fixture base plate 1310, and the loading plate 1340 is disposed on the transverse track plate 1320; the fixed end of the transverse pushing member 1330 is fixed to the fixture base plate 1310 or the transverse track plate 1320, and its moving end is connected to the loading plate 1340, that is, the transverse pushing member 1330 can push the loading plate 1340 to move laterally.

[0057] A gripper drive component 1350 is fixedly provided on the upper side of the loading plate 1340. The gripper drive component 1350 is used to drive the upper gripper 1360 and the lower gripper 1370 to approach / separate.

[0058] It should be noted that the upper and lower jaws of the left and right clamping assemblies in this application are insulators. For example... Figure 9 As shown, an upper clamp 1380 is disposed below the upper jaw, and a lower clamp 1390 is disposed above the lower jaw. The upper and lower clamps (both metal bodies) constitute a test clamp on one side of the LCR measuring instrument. A spring connection is provided between the upper clamp 1380 and the upper jaw, and the lower clamp 1390 is fixedly disposed on the upper surface of the lower jaw.

[0059] It should be noted that the left clamp assembly / right clamp assembly can also adopt the clamp design of the prior art.

[0060] Figure 10 The diagram illustrates the three-dimensional structure of the loading assembly 1600 and the unloading assembly 1700. The loading assembly 1600 includes a loading tray 1610 and a servo loading mechanism 1620, which drives the loading tray 1610 to move up and down. The unloading assembly 1700 includes an unloading tray 1710 and a servo unloading mechanism 1720, which drives the unloading tray 1710 to move up and down.

[0061] Figure 11 The diagram illustrates the control panel of the collaborative robot 1400. (For example...) Figure 11 As shown, the operating end of the collaborative robot 1400 includes two grippers 1410 and a wire-splitting mechanism 1420. The two grippers 1410 are used to grip the coil 2000 to be tested (during gripping, one gripper 1410 is inside the hollow center of the coil 2000, and the other is outside the hollow center of the coil 2000). The wire-splitting mechanism 1420 is used to increase the distance between the two leads.

[0062] A method for detecting micro-defects in magnetic bearing coils based on LCR AC / DC differential detection includes the following steps: S100, Select the coil to be tested: The operator pre-places the loading tray 1610 with several coils to be tested 2000 into the servo loading mechanism 1620. The servo loading mechanism 1620 rises to raise the loading tray 1610 to a suitable height. S200, Placing the coil to be tested: The collaborative robot 1400 takes a coil to be tested 2000 from the loading tray 1610 and places it on the testing placement plate 1110, so that the testing insertion seat 1120 is inserted into the hollow center of the coil to be tested 2000; then, the collaborative robot 1400 separates from the coil to be tested 2000, and the limiting baffle longitudinal movement driving component 1132 drives the limiting baffle 1131 to move, clamping the coil to be tested 2000 through the limiting baffle 1131 and the testing insertion seat 1120; S300, the placement plate transverse drive component 1140 is started, driving the detection placement plate 1110 and the coil to be detected to the predetermined detection position; S400, Separation Operation: The separation operation mechanism 1420 of the collaborative robot 1400 is inserted into the gap between the two leads of the coil to be tested 2000. The collaborative robot 1400 moves to the left and then to the right to separate the two leads of the coil to be tested 2000 into a figure-eight shape. Then, the collaborative robot 1400 separates from the coil to be tested 2000. S500, the left clamp assembly 1200 and the right clamp assembly 1300 drive the test clamp of the LCR measuring instrument to clamp the two leads of the coil to be tested 2000 respectively; Initially, both the left clamp assembly 1200 and the right clamp assembly 1300 are in the open state. Then, the upper and lower jaws of the left clamp assembly 1200 move to the right and then approach each other, causing the upper and lower clamps to clamp the lead wire. The upper and lower jaws of the right clamp assembly 1300 move to the right and then approach each other, causing the upper and lower clamps to clamp the lead wire. The S600 LCR meter measures and obtains the AC / DC resistance difference ΔR; it includes the following sub-steps: S601, set to 1kHz series mode, measure AC equivalent resistance R s ; S602, then switch the LCR meter to DC Rdc mode and measure the coil DC resistance R. dc ; S603, Solve for the AC / DC resistance difference ΔR, ΔR = R s -R dc ; S700, after the measurement is completed, the left clamp assembly 1200 and the right clamp assembly 1300 return to their initial state; the upper and lower jaws of the left clamp assembly 1200 and the right clamp assembly 1300 move away from each other and then move away from the two leads of the coil to be measured; S800, if ΔR≤0.004Ω, the collaborative robot 1400 places the coil to be tested into the unloading tray 1710 in the unloading assembly 1700 (placed on one side of the unloading tray: Class A product). If 0.004Ω < ΔR ≤ 0.010Ω, the collaborative robot 1400 places the coil to be tested into the unloading tray 1710 in the unloading assembly 1700 (placed on the other side of the unloading tray: Class B product).

[0063] If ΔR > 0.010Ω, the collaborative robot 1400 places the coil to be tested into the throwing box 1800.

[0064] The above-described embodiments are preferred embodiments of this application and are only used to facilitate the illustration of this application. They are not intended to limit this application in any way. Any person with ordinary knowledge in the art can make equivalent embodiments by making partial modifications or alterations to the technical content disclosed in this application without departing from the scope of the technical features of this application. Such equivalent embodiments are still within the scope of the technical features of this application.

Claims

1. A fixture for detecting the AC / DC resistance difference of a magnetic bearing coil, characterized in that, include: a. Placement component, which is used to place and fix the coil to be tested; It includes: a detection placement plate and a detection insertion seat and a coil fixing component disposed on the detection placement plate; the coil fixing component includes: a limiting baffle and a limiting baffle longitudinal movement driving component for driving the limiting baffle to move longitudinally; when placing the coil to be tested, the coil to be tested is placed on the detection placement plate and the detection insertion seat is inserted into the hollow center of the coil to be tested; the limiting baffle longitudinal movement driving component drives the limiting baffle to move, and the limiting baffle and the detection insertion seat clamp the coil to be tested; b. The left clamp assembly and the right clamp assembly are used to drive the test clamps on both sides of the LCR measuring instrument to clamp / release the two leads of the coil to be tested; c, LCR meter for measuring the coil to be tested to obtain the ac equivalent resistance R s and the coil dc resistance R dc .

2. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 1, characterized in that, The number of detection insertion seats is multiple, and the coil fixing component includes multiple limiting baffles and a limiting baffle longitudinal movement driving component that drives the multiple limiting baffles to move longitudinally together; the detection insertion seats correspond one-to-one with the limiting baffles, and the multiple detection insertion seats and their corresponding limiting baffles are used to detect different types of coils to be tested.

3. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 1, characterized in that, The placement assembly further includes: a placement plate lateral movement driving component; the placement plate lateral movement driving component is capable of driving the detection placement plate to move laterally.

4. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 3, characterized in that, The left and right clamping assemblies have the same structure, both including: clamping base plate, transverse track plate, loading plate, transverse pushing component, gripper driving component, upper gripper, and lower gripper; The transverse track plate is fixedly mounted on the base plate of the clamp, and the loading plate is movably mounted on the transverse track plate. The lateral pushing component is used to drive the carrier plate to translate laterally; a gripper driving component is fixedly provided on the upper side of the carrier plate, and the gripper driving component is used to drive the upper gripper to approach / separate from the lower gripper. Both the upper and lower grippers are insulators. The upper clamp is located below the upper jaw, and the lower clamp is located above the lower jaw. The upper clamp and the lower clamp together form the test clamp on one side of the LCR measuring instrument.

5. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 4, characterized in that, The upper clamp and the upper jaw are connected by a spring, and the lower clamp is fixedly set on the upper surface of the lower jaw.

6. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 4, characterized in that, The upper and lower jaws of the left clamping assembly and the upper and lower jaws of the right clamping assembly are staggered in the longitudinal direction.

7. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 4, characterized in that, The AC / DC resistance difference detection fixture for the magnetic bearing coil further includes a collaborative robot; the operating end of the collaborative robot includes two grippers and a wire splitting mechanism; the two grippers are used to grip the coil to be tested; the wire splitting mechanism is used to increase the distance between the two leads of the coil to be tested.

8. The fixture for detecting the AC / DC resistance difference of a magnetic bearing coil according to claim 7, characterized in that, The AC / DC resistance difference detection fixture for the magnetic bearing coil also includes: f, feeding assembly, which is used to place the coil to be tested; g, feeding assembly, which is used to collect qualified coils; h, Disposal box, which is used to collect defective coils.

9. A method for detecting the AC / DC resistance difference of a magnetic bearing coil, characterized in that, The detection using the AC / DC resistance difference detection fixture for the magnetic bearing coil as described in claim 8 includes the following steps: S100, Placing the coil to be tested: The collaborative robot takes a coil to be tested from the loading tray and places it on the testing placement plate, so that the testing insertion seat is inserted into the hollow center of the coil to be tested; then, the collaborative robot separates from the coil to be tested, and the limiting baffle longitudinal movement driving component drives the limiting baffle to move, clamping the coil to be tested through the limiting baffle and the testing insertion seat; S200, the placement plate transverse movement drive component is activated, driving the detection placement plate and the coil to be detected to the predetermined detection position; S300, wire splitting operation: The wire splitting mechanism of the collaborative robot is inserted into the gap between the two leads of the coil to be tested. The collaborative robot moves left and right in turn to split the two leads of the coil to be tested into a figure-eight shape. Then, the collaborative robot separates from the coil to be tested. S500, the left clamp assembly and the right clamp assembly drive the test clamp of the LCR measuring instrument to move toward and clamp the two leads of the coil to be tested; The S600 LCR meter measures and obtains the AC / DC resistance difference ΔR; it includes the following sub-steps: S601, set to 1kHz series mode, measure AC equivalent resistance R s ; S602, then switch the LCR meter to DC Rdc mode and measure the coil DC resistance R. dc ; S603, Solve for the AC / DC resistance difference ΔR, ΔR = R s -R dc .

10. An application of a method for detecting the AC / DC resistance difference of a magnetic bearing coil, used for the detection and processing of oxidation matching of mating coils in magnetic bearings, characterized in that... The AC / DC resistance difference ΔR of the magnetic bearing coil is detected using the AC / DC resistance difference detection method of the magnetic bearing coil as described in claim 9. If ΔR > 0.010Ω, the coil is a defective product, cannot meet the oxidation requirements, and is prohibited from being used for mating soldering. If ΔR≤0.004Ω, the coil is of normal grade, meets the oxidation requirements, and can be directly used for mating welding; If 0.004Ω < ΔR ≤ 0.010Ω, the coil is classified as a process warning level and requires enhanced deoxidation treatment before mating and soldering.

Images