A vacuum electric measuring device for a motor stator

Abstract

The utility model discloses a motor stator vacuum electric measuring equipment belongs to motor stator test technical field. A motor stator vacuum electric measuring equipment, include: vacuum control pipeline, scroll vacuum dry pump and stator test subassembly, vacuum control pipeline with scroll vacuum dry pump links to each other, and vacuum control pipeline with stator test subassembly links to each other, the utility model discloses through scroll vacuum dry pump evacuation, pirani vacuum gauge real -time feedback regulation, can be stabilized in low vacuum environment with quick test cavity, after testing, through the vacuum insulation valve communication atmosphere, can complete the breaking vacuum fast, realize " vacuum test - breaking vacuum - replace product - vacuum test again " circulation process, effectively promote test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of motor stator testing technology, and in particular to a motor stator vacuum electrical testing device. Background Technology

[0002] Permanent magnet synchronous motors are widely used in electric vehicles, robotics, high-end industries, and aerospace due to their high efficiency, excellent dynamic response, and low noise. As the core component, the motor stator undergoes rigorous pre-shipment testing to ensure overall performance, safety, and reliability. This testing includes withstand voltage tests, current and voltage detection, and load tests to verify compliance with design standards.

[0003] Currently, the commonly used industrial methods for testing motor stators are mainly divided into two categories: atmospheric pressure electrical testing and vacuum electrical testing. Atmospheric pressure electrical testing equipment is widely used due to its low cost and convenient maintenance, but it has significant limitations: the dielectric strength of the medium is weak in the atmospheric environment, and voltage breakdown is prone to occur during high-voltage testing, resulting in a high safety risk; oxygen and moisture in the air will accelerate the oxidation and electrochemical corrosion of the stator winding copper wire and insulation materials, affecting product quality; and air convection in the atmospheric environment will provide additional heat dissipation for the stator, causing the thermodynamic performance parameters measured in the test to be higher than those in the actual application scenario (especially in stator designs that rely on air cooling), and failing to truly reflect its performance under extreme operating conditions.

[0004] While some existing vacuum electrical testing equipment can solve some of the above-mentioned technical problems, existing vacuum electrical testing equipment suffers from complex structure, high cost, large test chamber volume leading to low vacuuming efficiency, and difficulty in implementing cyclic testing processes. Utility Model Content

[0005] The purpose of this utility model is to solve the problems mentioned in the background art and to provide a vacuum electrical testing device for motor stator.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A vacuum electrical testing device for motor stator, comprising:

[0008] Vacuum control piping, scroll vacuum dry pump, and stator test assembly;

[0009] The vacuum control pipeline is connected to the vortex vacuum dry pump, and the vacuum control pipeline is also connected to the stator test assembly.

[0010] The vacuum control pipeline is used to control the test environment to cycle between vacuum and atmosphere; the stator test assembly is used to place the stator of the motor to be tested and connect it to an external test instrument for electrical performance testing.

[0011] Preferably, the vacuum control pipeline includes a silencer, a Pirani vacuum gauge, a bellows, a vacuum isolation valve, and a vacuum pipe; the vacuum pipe is connected to the drive end of a vortex vacuum dry pump; the end of the vacuum pipe away from the vortex vacuum dry pump is connected to the bellows; the Pirani vacuum gauge is connected to a branch pipe of the vacuum pipe for detecting and feeding back the gas pressure inside the pipeline; the bellows is used for flexibly connecting the vacuum control pipeline and the stator test assembly; the silencer is connected to the vacuum pipe through the vacuum isolation valve for connecting to the atmosphere when the vacuum is broken.

[0012] Furthermore, the stator testing assembly includes a test motor stator, an acrylic vacuum chamber, a test probe, a cylinder, and a bellows connector; the drive end of the cylinder is fixedly connected to the top of the acrylic vacuum chamber; the test probe is used to transmit electrical signals from an external testing instrument to the test motor stator; and the end of the bellows furthest from the vacuum pipe is connected to the bellows connector.

[0013] Furthermore, the stator testing assembly also includes an optical fiber sensor, which is used to detect the placement position of the test motor stator.

[0014] Furthermore, the stator testing assembly also includes a barcode scanner, which is used to read the QR code on the stator of the test motor to record the test results.

[0015] Compared with the prior art, this utility model provides a vacuum electrical testing device for motor stator, which has the following beneficial effects:

[0016] 1. This utility model uses a vortex vacuum dry pump to draw a vacuum and a Pirani vacuum gauge to provide real-time feedback and adjustment, which can quickly stabilize the test chamber in a low vacuum environment. After the test is completed, the vacuum is broken by connecting it to the atmosphere through a vacuum isolation valve, realizing a cycle of "vacuum test - vacuum breaking - product replacement - re-vacuum test", which effectively improves the testing efficiency.

[0017] 2. This utility model significantly improves the dielectric strength of the dielectric by conducting tests in a vacuum environment, effectively reducing the risk of voltage breakdown during high-voltage testing, and is especially suitable for critical power testing of high-power motor stators; at the same time, the vacuum environment isolates oxygen and moisture, avoiding oxidation and corrosion of the stator winding copper wire and insulation materials during the test, ensuring the stability of component performance before and after the test, and reducing the interference of the external environment on the test results.

[0018] 3. This utility model can also eliminate the additional heat dissipation caused by air convection in the atmospheric environment, accurately expose the heat dissipation defects of the stator's air-cooled design, and make the thermal performance parameters obtained by the test closer to the actual application scenario; combined with the detection of the stator placement position by the fiber optic sensor and the binding and traceability of the test data by the barcode scanner, the accuracy and traceability of the test results are further ensured. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a vacuum electrical measuring device for a motor stator proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the stator testing component in a vacuum electrical testing device for motor stators proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the vacuum control pipeline in a vacuum electrical testing device for a motor stator proposed in this utility model.

[0022] In the diagram: 100, vacuum control piping; 110, silencer; 120, Pirani vacuum gauge; 130, bellows; 140, vacuum isolation valve; 150, vacuum pipeline; 200, vortex vacuum dry pump; 300, stator test assembly; 310, test motor stator; 320, plexiglass vacuum enclosure; 330, test probe; 340, cylinder; 350, bellows connector; 360, fiber optic sensor; 370, barcode scanner. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example:

[0025] Reference Figures 1-3 A vacuum electrical testing device for motor stator, comprising:

[0026] Vacuum control piping 100, vortex vacuum dry pump 200, and stator test assembly 300;

[0027] Vacuum control line 100 is connected to vortex vacuum dry pump 200, and vacuum control line 100 is connected to stator test assembly 300.

[0028] The vacuum control pipeline 100 is used to control the test environment to cycle between vacuum and atmosphere; the stator test assembly 300 is used to place the stator 310 of the motor under test and connect it to an external test instrument for electrical performance testing.

[0029] The vacuum control pipeline 100 includes a silencer 110, a Pirani vacuum gauge 120, a bellows 130, a vacuum isolation valve 140, and a vacuum pipe 150. The vacuum pipe 150 is connected to the drive end of the vortex vacuum dry pump 200. The end of the vacuum pipe 150 away from the vortex vacuum dry pump 200 is connected to the bellows 130. The Pirani vacuum gauge 120 is connected to a branch pipe of the vacuum pipe 150 to detect and provide feedback on the gas pressure inside the pipeline. The bellows 130 is used to flexibly connect the vacuum control pipeline 100 and the stator test assembly 300. The silencer 110 is connected to the vacuum pipe 150 through the vacuum isolation valve 140 to allow air to pass through when the vacuum is broken.

[0030] The stator test assembly 300 includes a test motor stator 310, an acrylic vacuum chamber 320, a test probe 330, a cylinder 340, and a bellows connector 350; the drive end of the cylinder 340 is fixedly connected to the top of the acrylic vacuum chamber 320; the test probe 330 is used to transmit electrical signals from an external tester to the test motor stator 310; the end of the bellows 130 away from the vacuum pipe 150 is connected to the bellows connector 350.

[0031] The stator test assembly 300 also includes a fiber optic sensor 360, which is used to detect the placement position of the test motor stator 310.

[0032] The stator test assembly 300 also includes a barcode scanner 370, which is used to read the QR code on the test motor stator 310 to record the test results.

[0033] In actual operation, the operator places the stator 310 of the test motor to be tested in the preset test position of the stator test assembly 300, ensuring that the stator electrode and the test probe 330 are aligned; then the operator presses the equipment start button to trigger the start of the test process.

[0034] Reference Figures 1-3 During testing, the fiber optic sensor 360 immediately detects the placement position of the test motor stator 310. If the stator is not in the preset test position, the equipment issues a warning signal and pauses the process. The test is restarted after the operator adjusts the stator position to the correct state. If the position is correct, the barcode scanner 370 automatically reads the QR code attached to the surface of the test motor stator 310 and binds the product serial number of the stator with the subsequent test data to achieve traceability of the test results.

[0035] After the positioning and information binding are completed, the cylinder 340 is started as a power source. Its drive end drives the plexiglass vacuum cover 320 to descend vertically until the bottom of the vacuum cover is tightly attached to the equipment base, forming a closed test chamber, which completely isolates the test motor stator 310 from the external atmospheric environment; at this time, the initial pressure inside the chamber is atmospheric.

[0036] After the sealed cavity is formed, the vacuum isolation valve 140 connected to the vortex vacuum dry pump 200 in the vacuum control pipeline 100 automatically opens, the vortex vacuum dry pump 200 starts and extracts gas from the sealed cavity through the vacuum pipeline 150, bellows 130 and bellows joint 350; during the process, the Pirani vacuum gauge 120 detects the gas pressure in the vacuum pipeline 150 and the sealed cavity in real time and feeds the data back to the equipment control system. The control system adjusts the operating power of the vortex vacuum dry pump 200 according to the preset vacuum level to ensure that the cavity reaches and stabilizes at the target low vacuum environment within 20 seconds.

[0037] It should be noted that the target low vacuum environment is a transition from a viscous, stagnant gas state to a molecular state, where convection completely disappears.

[0038] Once the Pirani vacuum gauge 120 detects that the sealed cavity has reached the target vacuum level and stabilized, the control system sends a start signal to the external test instrument. The electrical signal from the external test instrument is transmitted to the stator 310 of the test motor through the test probe 330, and the electrical performance test begins. During the test, the Pirani vacuum gauge 120 continuously monitors the vacuum level of the cavity. If fluctuations occur, the control system adjusts the operating status of the scroll vacuum dry pump 200 to maintain the vacuum level within the preset range, ensuring a stable test environment.

[0039] After the electrical performance test is completed, the external tester sends a test completion signal to the equipment control system. The control system first closes the vacuum isolation valve 140 connected to the vortex vacuum dry pump 200, cutting off the passage between the vacuum pump and the sealed cavity. Then, it opens the vacuum isolation valve 140 connected to the silencer 110, allowing atmospheric air to slowly enter the sealed cavity through the silencer 110, thus breaking the vacuum. The Pirani vacuum gauge 120 monitors the cavity pressure in real time. When it detects that the pressure has returned to atmospheric pressure, it sends a signal to the control system. The control system then drives the cylinder 340 to run in reverse, causing the plexiglass vacuum cover 320 to rise vertically and open the sealed cavity. In practice, after the cavity is opened, the operator can remove the tested motor stator 310, completing one test cycle. To perform the next test, the above steps can be repeated, achieving a cyclical vacuum electrical test process.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A vacuum electrical testing device for a motor stator, characterized in that, include: Vacuum control piping (100), vortex vacuum dry pump (200), and stator test assembly (300); The vacuum control line (100) is connected to the vortex vacuum dry pump (200), and the vacuum control line (100) is connected to the stator test assembly (300); The vacuum control pipeline (100) is used to control the test environment to cycle between vacuum and atmosphere; the stator test assembly (300) is used to place the stator of the motor to be tested and connect it to an external test instrument for electrical performance testing.

2. The motor stator vacuum electrical testing device according to claim 1, characterized in that, The vacuum control pipeline (100) includes a silencer (110), a Pirani vacuum gauge (120), a bellows (130), a vacuum isolation valve (140), and a vacuum pipe (150); the vacuum pipe (150) is connected to the drive end of a vortex vacuum dry pump (200); one end of the vacuum pipe (150) away from the vortex vacuum dry pump (200) is connected to the bellows (130); the Pirani vacuum gauge (120) is connected to a branch pipe of the vacuum pipe (150) for detecting and feeding back the gas pressure in the pipeline; the bellows (130) is used to flexibly connect the vacuum control pipeline (100) and the stator test assembly (300); the silencer (110) is connected to the vacuum pipe (150) through the vacuum isolation valve (140) for connecting to the atmosphere when the vacuum is broken.

3. The motor stator vacuum electrical testing device according to claim 2, characterized in that, The stator test assembly (300) includes a test motor stator (310), an acrylic vacuum chamber (320), a test probe (330), a cylinder (340), and a bellows connector (350); the drive end of the cylinder (340) is fixedly connected to the top of the acrylic vacuum chamber (320); the test probe (330) is used to transmit the electrical signal of the external tester to the test motor stator (310); the end of the bellows (130) away from the vacuum pipe (150) is connected to the bellows connector (350).

4. The motor stator vacuum electrical testing device according to claim 3, characterized in that, The stator test assembly (300) also includes an optical fiber sensor (360) for detecting the placement position of the test motor stator (310).

5. The motor stator vacuum electrical testing device according to claim 3, characterized in that, The stator test assembly (300) also includes a barcode scanner (370), which is used to read the QR code on the test motor stator (310) to record the test results.

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