A device and method for testing the rotor withstand voltage of a fine-wire motor

Abstract

A withstand voltage test device and a test method for a fine-wire motor rotor, the test device comprising a test base assembly, base fixing screws, a safety protection door, a slide rail, a contact switch, a high-voltage line, a rotor comprehensive tester, a test base plate, a front mounting seat, a rear mounting seat and a mounting column; by reasonably setting arc detection parameters and adding a fixture sleeve simulating the inner diameter of a motor stator to a rotor comprehensive test fixture, the problem of enameled wire hanging on an insulating end plate, the problem of insulation slot paper displacement or slot paper shortness leading to insufficient creepage distance and electrical clearance, the problem of enameled wire pickup, the problem of iron filings on rotor chips, the problem of enameled wire scratches, i.e., the insulation layer is damaged and the distance to the chip is close, the problem of wire tail being too long and arbitrarily staying between commutator segments, and the problem of insufficient electrical clearance and creepage distance and large leakage current generated after assembly with the motor stator can be detected, and the rotor can be effectively tested before and after painting.

Description

Technical Field

[0001] The present invention relates to the field of motor withstand voltage testing, and in particular to a thin-wire motor rotor withstand voltage testing device and a testing method thereof. Background Art

[0002] The withstand voltage test is a method of detecting and testing the electrical resistance of various electrical equipment, insulating materials and insulating structures. It is an assessment of electrical strength. Electrical strength is the electrical resistance of various voltage devices, especially motors, insulating materials and insulating structures. The withstand voltage test assesses the electrical resistance of motor insulators by applying a specified power frequency test voltage. The purpose of the test is to detect the quality of motor insulation manufacturing or maintenance, eliminate damage to insulation caused by raw materials, operation or transportation, reduce the early failure rate of motor products, test the electrical clearance and creepage distance of insulation, and test the insulation strength of insulating materials. The withstand voltage test should not produce any abnormal sound, nor should it cause arcing or insulation breakdown, that is, by measuring the effective value of the current I flowing through the motor. RMS To judge whether the insulation characteristics meet the requirements.

[0003] At present, this method can effectively detect the changes in current or direct breakdown defects in the motor insulation, but it is difficult to detect arcing, discharge or spark discharge caused by insufficient electrical clearance and creepage distance. These defects will produce pulse currents with frequencies ranging from 3kHz to 250kHz, which cannot be identified by current effective value measurement. Arc detection is needed to identify these insulation defects. At the same time, European and American customers are not limited to the voltage withstand test not exceeding the leakage current requirement for motor withstand test, and arcing, discharge or spark discharge are also not allowed to occur.

[0004] The fine-wire motor rotor is generally the common name for the rotor of the motor rotor enameled wire diameter of the motor industry enterprise less than Φ0.15mm. Since the dynamic tension during winding should not be too large, the dynamic tension experience range is (6~8)×fine wire diameter area×1000g. If it exceeds the experience limit, the wire will often break during the winding process. If it is too small, it is easy to cause the wire tail to be too long after the winding is completed. This wire tail is too long and stays in any position, which is a great hidden danger. This state may be close to the rotor chip position, or it may be between the two pieces of the commutator. Through the identification and judgment of the operator combined with the conventional withstand voltage test or even arc detection, it may not be possible to detect whether the rotor has poor withstand voltage, and whether the assembled finished motor has poor withstand voltage. In fact, the complaints received by the motor industry enterprises from customers just confirm this problem. The finished motor sometimes passes the withstand voltage test and sometimes fails. The reason is that the rotor wire tail is too long when it stops, and the electrical clearance and creepage distance between the stator are not enough, and the leakage current is large, so an alarm is given, or the electrical clearance and creepage distance between the mounting bracket are not enough, and the leakage current is large, so an alarm is given. Summary of the invention

[0005] The present invention aims to overcome the defects of the prior art and provide a pressure test device and a test method based on a fine-wire motor rotor. By reasonably setting arc detection parameters and installing a device simulating the inner diameter of the motor stator (hereinafter referred to as the fixture sleeve) on the rotor comprehensive test fixture, it aims to solve the pressure resistance hidden dangers and confusion that plague motor industry companies in the actual manufacturing process. Improve the pressure resistance detection capability of the motor rotor, reduce the number of scrapped motor rotors tested before and after varnishing, eliminate random hidden dangers of poor pressure resistance of finished motors, and reduce customer complaints and returns.

[0006] A withstand voltage test device for a fine-wire motor rotor comprises a test fixture, a test base assembly, a base fixing screw, a safety protection door, a slide rail, a contact switch, a high-voltage line, a rotor comprehensive tester, a test base plate, a front mounting seat, a rear mounting seat and a mounting column, wherein the test fixture is mounted on the front mounting seat, the test base assembly is mounted on the rear mounting seat, and the front mounting seat and the rear mounting seat are fixedly mounted on the test base plate; the rotor comprehensive tester is connected to the motor rotor through a high-voltage line, and the motor rotor is placed in the test fixture; the test base assembly comprises a fixture sleeve, a test base, a positioning pin, a grounding block, a wiring terminal and a fixture sleeve fixing screw, the test seat is fixedly mounted on the rear mounting seat through the base fixing screw, the positioning pin and the grounding block are mounted in the mounting groove on the test base, and the fixture sleeve is fixedly mounted on one end of the test base close to the test fixture through the fixture sleeve fixing screw; when the motor rotor is placed on the test fixture, the commutator end chip of the motor rotor extends into the fixture sleeve.

[0007] Furthermore, the safety protection door is installed on a mounting column through a slide rail, the mounting column is fixed on the test base plate and the outer sides of the front and rear mounting seats, and the contact switch is installed on one side of the mounting column.

[0008] Furthermore, the clamp sleeve is made of copper alloy material.

[0009] Furthermore, there are two grounding blocks, which are symmetrically mounted on the test base.

[0010] Furthermore, an arc groove is provided on the test base, and the base fixing screw passes through the arc groove and is threadedly connected to the rear mounting seat.

[0011] A method for testing the rotor withstand voltage of a fine-wire motor, the specific steps are as follows:

[0012] (a) Debug the rotor comprehensive tester, that is, set the resistance specifications, welding resistance, insulation resistance specifications, turn-to-turn withstand voltage test specifications, arc detection parameters, and high-voltage test specifications of the motor rotor to be tested;

[0013] (b) Place the commutator end of the motor rotor to be tested into the test fixture. The rotor test base supports the rotor chip and fixes it with the base fixing screws. Then close the safety protection door. The safety protection door slides over the guide rail and contacts the contact switch. The rotor comprehensive tester performs various parameter tests through the high-voltage line.

[0014] Furthermore, it is applied to withstand voltage tests of AC fine-wire motor rotors before and after varnishing.

[0015] Similarly, it is used for withstand voltage tests on DC fine-wire motor rotors before and after varnishing.

[0016] In summary, the present invention has the following beneficial effects: by reasonably setting arc detection parameters and adding a fixture sleeve simulating the inner diameter of the motor stator to the rotor comprehensive test fixture, the present invention can detect the problem of enameled wire hanging on the insulating end plate, the problem of insulation slot paper displacement or slot paper shortness leading to insufficient creepage distance and electrical clearance, the problem of enameled wire pickup, the problem of iron filings on the rotor chip, the problem of enameled wire scratches, that is, the insulation layer is damaged and close to the chip, the problem of the wire tail being too long and arbitrarily staying between the commutator segments, and the problem of insufficient electrical clearance and creepage distance and large leakage current after assembly with the motor stator. The rotor can be effectively tested before and after painting, and at the same time, no random hidden danger events of poor withstand voltage will occur when the motor is assembled. Random hidden danger events of poor withstand voltage are eliminated, and there are no more customer complaints. The requirements of European and American customers for motor withstand voltage testing that does not exceed the leakage current are met, and no arcing, discharge or spark discharge and other problems occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram describing the principle of arc detection testing;

[0018] Figure 2 It is the test schematic;

[0019] Figure 3 It is the test waveform diagram;

[0020] Figure 4 This is the tester wiring diagram;

[0021] Figure 5 This is the wiring diagram of the oscilloscope;

[0022] Figure 6 It is the waveform of continuous spark discharge;

[0023] Figure 7 It is a schematic diagram of the overall structure of the test device;

[0024] Figure 8 is an exploded view of the test base assembly.

[0025] In the figure: 1. Test fixture; 2. Test base assembly; 2-1. Fixture cover; 2-2. Test base; 2-3. Positioning pin; 2-4. Grounding block; 2-5. Wiring terminal; 2-6. Fixture cover fixing screw; 3. Base fixing screw; 4. Safety protection door; 5. Slide rail; 6. Contact switch; 7. High voltage line; 8. Rotor comprehensive tester; 9. Test base plate; 10. Front mounting seat; 11. Rear mounting seat; 12. Mounting column. DETAILED DESCRIPTION

[0026] like Figure 7 and Figure 8 As shown, a withstand voltage test device for a fine-wire motor rotor comprises a test fixture 1, a test base assembly 2, a base fixing screw 3, a safety protection door 4, a slide rail 5, a contact switch 6, a high-voltage line 7, a rotor comprehensive tester 8, a test base plate 9, a front mounting seat 10, a rear mounting seat 11 and a mounting column 12, wherein the test fixture 1 is mounted on the front mounting seat 10, the test base assembly 2 is mounted on the rear mounting seat 11, and the front mounting seat 10 and the rear mounting seat 11 are fixedly mounted on the test base plate 9; the rotor comprehensive tester 8 is connected to the motor rotor through the high-voltage line 7, and the motor rotor is placed in the test fixture 1; the test base assembly 2 comprises a fixture sleeve 2-1, a test base 2-2, a positioning pin 2-3, a grounding block 2-4, a wiring terminal 2-5 and a fixture sleeve fixing screw 2-6, the test base 2-2 is fixedly mounted on the rear mounting seat 11 through the base fixing screw 3, the positioning pin 2-3 and the grounding block 2-4 are mounted in the mounting groove on the test base 2-2, and the fixture sleeve 2-1 It is fixedly mounted on the test base 2-2 at one end close to the test fixture 1 by the fixture sleeve fixing screws 2-6; when the motor rotor is placed on the test fixture 1, the commutator end chip of the motor rotor extends into the fixture sleeve 2-1.

[0027] Furthermore, the safety protection door 4 is mounted on the mounting column 12 via the slide rail 5 . The mounting column 12 is fixed on the test base plate 9 and outside the front and rear mounting seats. The contact switch 6 is mounted on one side of the mounting column 12 .

[0028] Furthermore, the clamp sleeve 2-1 is made of copper alloy material.

[0029] Furthermore, there are two grounding blocks 2 - 4 , and the two grounding blocks 2 - 4 are symmetrically mounted on the test base 2 - 2.

[0030] Furthermore, an arc groove is provided on the test base 2 - 2 , and the base fixing screw 3 passes through the arc groove and is threadedly connected to the rear mounting seat 11 .

[0031] A method for testing the rotor withstand voltage of a fine-wire motor, the specific steps are as follows:

[0032] (a) Debug the rotor comprehensive tester, that is, set the resistance specifications, welding resistance, insulation resistance specifications, turn-to-turn withstand voltage test specifications, arc detection parameters, and high-voltage test specifications of the motor rotor to be tested;

[0033] (b) Place the commutator end of the motor rotor to be tested into the test fixture 1, support the rotor chip with the rotor test base 2-2 and fix it with the base fixing screws 3, then close the safety protection door 4, the safety protection door 4 slides over the guide rail 5 and contacts the 6 contact switch, and the rotor comprehensive tester 8 performs various parameter tests through the high-voltage line 7.

[0034] Furthermore, it is applied to withstand voltage tests of AC fine-wire motor rotors before and after varnishing.

[0035] Similarly, it is used for withstand voltage tests on DC fine-wire motor rotors before and after varnishing.

[0036] like Figure 1 As shown in the figure, it is a description of the arc detection test principle: the arc is actually a gas discharge phenomenon, and the instantaneous spark generated by the current passing through some insulating medium (such as air), where the waveform in figure (a) is the waveform of the circuit using resistor R, and the circles in figure (c) are several arc current waveforms. Factors affecting the arc include voltage, electrical clearance and creepage distance, insulation material damage exposure distance and material pollution level.

[0037] like Figure 2 and Figure 3 As shown, Figure 2 To test the schematic, Figure 3 To test the waveform; the main parameters are set as follows:

[0038] 1. High frequency: 3KHz-250KHz;

[0039] 2. Short duration: generally less than 10ms;

[0040] 3. Discontinuity;

[0041] 4. Superimposed on the crest of the sine wave (such as Figure 3 );

[0042] 5. Form: pluse or spike type (pulse or spike).

[0043] Arc detection setting parameters are as follows:

[0044] Measurement bandwidth: recommended value 3KHz-250KHz.

[0045] Test environment conditions:

[0046] 1. Ambient temperature: 15℃~35℃, relative humidity: 25%~75%RH;

[0047] 2. Atmospheric pressure: 86kPa~106kPa;

[0048] 3. The test site is a normal environment, that is, there is no strong magnetic interference, vibration or impact.

[0049] The rotor comprehensive tester is selected with the following test conditions:

[0050] 1. Motor rotor DC resistance and welding resistance test;

[0051] 2. Motor rotor insulation resistance test;

[0052] 3. Motor rotor interturn withstand voltage test;

[0053] 4. Arc detection parameters and tests can be set, and arc detection waveforms can be displayed;

[0054] 5. Motor rotor withstand voltage and testing;

[0055] 6. The accuracy of the turn-to-turn withstand voltage test must meet GB / T 22719.1, GB / T 22719.2, JJF1691-2018;

[0056] 7. The motor rotor withstand voltage test refers to GB4706.1, UL1004-1, IEC60335-1, GB / T5171.21, GB12350, GB / T6656, JB / T5276.

[0057] like Figure 4 As shown, it is a tester wiring diagram, theoretical calculation:

[0058] The theoretical calculation formula is: peak =U / R×1.414;

[0059] Where:

[0060] I peak - arc current, mA;

[0061] U-experimental voltage, V;

[0062] R-current limiting resistor, KΩ;

[0063] Corresponding relationship between arc level, peak current and current limiting resistance (Table 1)

[0064] Arc level (level) Peak current (mA) Corresponding current limiting resistance value at 1800V voltage (kΩ) 9 2.8 909 8 5.5 463 7 7.7 331 6 10 255 5 12 212 4 14 182 3 16 159 2 18 141 1 20 127

[0065] like Figure 5 As shown, this is the wiring diagram of the oscilloscope:

[0066] An oscilloscope is used to detect the peak-to-peak current under the condition of continuous spark discharge. The peak current detected by the oscilloscope is consistent with the alarm and table detected by the test instrument. The error level shall not exceed 1 level, and the distribution range of the alarm level shall be consistent with the standard.

[0067] refer to Figure 5 Connect the comprehensive tester, spark discharge device, current limiting resistor, sampling resistor and oscilloscope. You can see the continuous spark discharge waveform, refer to Figure 6 .

[0068] Embodiment 1: Voltage withstand test method for AC thin-wire motor rotor before varnishing:

[0069] 1. Withstand voltage setting:

[0070] The reference test voltage is based on current standards such as GB4706.1, UL1004-1, IEC60335-1, GB / T5171.21, GB12350, GB / T6656, JB / T5276, etc. The test voltage frequency is 50Hz, the waveform is an actual sine wave, the capacity of the test equipment is not less than 0.5KVA, the test voltage (effective value) is 1000V+2Urms.max, Urms.max is the maximum effective value operating voltage, the rated voltage of the motor rotor is 220~240V, then the test power frequency withstand voltage is 1800V, the test leakage current is 1mA max, and the impact is 2sec. For the insulated winding of the motor with a rated voltage below 100V, the test voltage (effective value) is 500V+2Urms.max, Urms.max is the maximum effective value operating voltage. When the rated voltage of the motor rotor is less than 50V, the tested power frequency withstand voltage is 600V, the tested leakage current is 1mA max, and the impact is 2sec.

[0071] 2. Arc detection parameter settings:

[0072] The test voltage is equivalent to the withstand voltage test voltage, the detection time is 2 seconds, and the arc detection level is set to level 8, see Table 1.

[0073] 3. Design of the inner diameter of the fixture and the effective length of the chip length of the motor rotor commutator end entering the fixture sleeve (the design of the single-sided air gap distance of the motor rotor to be tested needs to be determined according to the pollution level of the motor finished product and the various electrical and electrical equipment, equipment and devices that the motor finished product is ultimately used for, the minimum creepage distance of basic insulation, the creepage distance of functional insulation and the electrical clearance of the motor in compliance with safety regulations):

[0074] Assume that the inner diameter of the fixture is D1, which is equivalent to the inner diameter of the stator of the motor. Take the outer diameter of the motor rotor under test as D2, in millimeters (the following are all in millimeters), the test single-side clearance is (D1-D2)÷2-0.15±0.05mm, and the length of the chip at the commutator end of the motor rotor entering the fixture is L / 4±2mm, where L is the thickness of the rotor chip under test.

[0075] 4. Withstand voltage test:

[0076] Refer to the withstand voltage test method steps (a) and (b).

[0077] 5. Motor rotor comprehensive test:

[0078] First, the resistance and welding resistance are tested, then the insulation resistance, then the turn-to-turn withstand voltage, then the arc detection, and finally the withstand voltage test. If the arc detection test fails, it needs to be sorted out and handed over to the on-site technicians for processing. Only after the arc detection test passes will the last step of the motor rotor comprehensive test, the withstand voltage test, be entered. After the withstand voltage test passes, the rotor can be judged as a good product.

[0079] Embodiment 2: Voltage withstand test method of AC fine-wire motor rotor after varnishing:

[0080] 1. Withstand voltage setting:

[0081] The reference test voltage is based on current standards such as GB4706.1, UL1004-1, IEC60335-1, GB / T5171.21, GB12350, GB / T6656, JB / T5276, etc. The test voltage frequency is 50Hz, the waveform is an actual sine wave, the capacity of the test equipment is not less than 0.5KVA, the test voltage (effective value) is 1000V+2Urms.max, Urms.max is the maximum effective value operating voltage, the rated voltage of the motor rotor is 220~240V, then the test power frequency withstand voltage is 1800V, the test leakage current is 1mAmax, and the impact is 2sec. For the insulated winding of the motor with a rated voltage below 100V, the test voltage (effective value) is 500V+2Urms.max, Urms.max is the maximum effective value operating voltage. When the rated voltage of the motor rotor is less than 50V, the tested power frequency withstand voltage is 600V, the tested leakage current is 1mA max, and the impact is 2sec.

[0082] 2. Arc detection parameter settings:

[0083] The test voltage is equivalent to the withstand voltage test voltage, the detection time is 2 seconds, and the arc detection level is set to level 9, see Table 1.

[0084] 3. Design of the inner diameter of the fixture and the effective length of the chip length of the motor rotor commutator end entering the fixture sleeve (the design of the single-sided air gap distance of the motor rotor to be tested needs to be determined according to the pollution level of the motor finished product and the various electrical and electrical equipment, equipment and devices that the motor finished product is ultimately used for, the minimum creepage distance of basic insulation, the creepage distance of functional insulation and the electrical clearance of the motor in compliance with safety regulations):

[0085] Assume that the inner diameter of the fixture is D1, which is equivalent to the inner diameter of the stator of the motor. Take the outer diameter of the motor rotor under test as D2, in millimeters (the following are all in millimeters), the test single-side clearance is (D1-D2)÷2-0.10±0.05mm, and the length of the chip at the commutator end of the motor rotor entering the fixture is L / 3±2mm, where L is the thickness of the rotor chip under test.

[0086] 4. Withstand voltage test:

[0087] Refer to the withstand voltage test method steps (a) and (b).

[0088] 5. Motor rotor comprehensive test:

[0089] First, the resistance and welding resistance are tested, then the insulation resistance, then the turn-to-turn withstand voltage, then the arc detection, and finally the withstand voltage test. If the arc detection test fails, it needs to be sorted out and handed over to the on-site technicians for processing. Only after the arc detection test passes will the last step of the motor rotor comprehensive test, the withstand voltage test, be entered. After the withstand voltage test passes, the rotor can be judged as a good product.

[0090] Embodiment 3: Method for withstand voltage test of DC fine-wire motor rotor before varnishing:

[0091] 1. Withstand voltage setting:

[0092] The reference test voltage is based on current standards such as GB4706.1, UL1004-1, IEC60335-1, GB / T5171.21, GB12350, GB / T6656, JB / T5276, etc. The test voltage frequency is 50Hz, the waveform is an actual sine wave, the capacity of the test equipment is not less than 0.5KVA, the test voltage (effective value) is 1000V+2Urms.max, Urms.max is the maximum effective value operating voltage, the rated voltage of the motor rotor is 220~240V, then the test power frequency withstand voltage is 1800V, the test leakage current is 1mAmax, and the impact is 2sec. For the insulated winding of the motor with a rated voltage below 100V, the test voltage (effective value) is 500V+2Urms.max, Urms.max is the maximum effective value operating voltage. When the rated voltage of the motor rotor is less than 50V, the tested power frequency withstand voltage is 600V, the tested leakage current is 1mA max, and the impact is 2sec.

[0093] 2. Arc detection parameter settings:

[0094] The test voltage is equivalent to the withstand voltage test voltage, the detection time is 2 seconds, and the arc detection level is set to level 9, see Table 1.

[0095] 3. Design of the inner diameter of the fixture and the effective length of the chip length of the motor rotor commutator end entering the fixture sleeve (the design of the single-sided air gap distance of the motor rotor to be tested needs to be determined according to the pollution level of the motor finished product and the various electrical and electrical equipment, equipment and devices that the motor finished product is ultimately used for, the minimum creepage distance of basic insulation, the creepage distance of functional insulation and the electrical clearance of the motor in compliance with safety regulations):

[0096] The inner diameter of the fixture is D3, which is equivalent to the effective inner diameter of the stator after bonding the magnet. The outer diameter of the motor rotor under test is D4, in millimeters (the following are all in millimeters), the test single-side gap is (D3-D4) ÷ 2-0.15 ± 0.05mm, and the length of the chip at the commutator end of the motor rotor entering the fixture is L / 4 ± 2mm, where L is the thickness of the rotor chip under test.

[0097] 4. Withstand voltage test:

[0098] Refer to the withstand voltage test method steps (a) and (b).

[0099] 5. Motor rotor comprehensive test:

[0100] First, the resistance and welding resistance are tested, then the insulation resistance, then the turn-to-turn withstand voltage, then the arc detection, and finally the withstand voltage test. If the arc detection test fails, it needs to be sorted out and handed over to the on-site technicians for processing. Only after the arc detection test passes will the last step of the motor rotor comprehensive test, the withstand voltage test, be entered. After the withstand voltage test passes, the rotor can be judged as a good product.

[0101] Embodiment 4: Method for withstand voltage test of DC fine-wire motor rotor after varnishing:

[0102] 1. Withstand voltage setting:

[0103] The reference test voltage is based on current standards such as GB4706.1, UL1004-1, IEC60335-1, GB / T5171.21, GB12350, GB / T6656, JB / T5276, etc. The test voltage frequency is 50Hz, the waveform is an actual sine wave, the capacity of the test equipment is not less than 0.5KVA, the test voltage (effective value) is 1000V+2Urms.max, Urms.max is the maximum effective value operating voltage, the rated voltage of the motor rotor is 220~240V, then the test power frequency withstand voltage is 1800V, the test leakage current is 1mAmax, and the impact is 2sec. For the insulated winding of the motor with a rated voltage below 100V, the test voltage (effective value) is 500V+2Urms.max, Urms.max is the maximum effective value operating voltage. When the rated voltage of the motor rotor is less than 50V, the tested power frequency withstand voltage is 600V, the tested leakage current is 1mA max, and the impact is 2sec.

[0104] 2. Arc detection parameter settings:

[0105] The test voltage is equivalent to the withstand voltage test voltage, the detection time is 2 seconds, and the arc detection level is set to level 9, see Table 1.

[0106] 3. Design of the inner diameter of the fixture and the effective length of the chip length of the motor rotor commutator end entering the fixture sleeve (the design of the single-sided air gap distance of the motor rotor to be tested needs to be determined according to the pollution level of the motor finished product and the various electrical and electrical equipment, equipment and devices that the motor finished product is ultimately used for, the minimum creepage distance of basic insulation, the creepage distance of functional insulation and the electrical clearance of the motor in compliance with safety regulations):

[0107] The inner diameter of the fixture is D3, which is equivalent to the effective inner diameter of the stator after bonding the magnet. The outer diameter of the motor rotor under test is D4, in millimeters (the following are all in millimeters), the test single-side gap is (D3-D4) ÷ 2-0.10 ± 0.05mm, and the length of the chip at the commutator end of the motor rotor entering the fixture is L / 3 ± 1mm, where L is the thickness of the rotor chip under test.

[0108] 4. Withstand voltage test:

[0109] Refer to the withstand voltage test method steps (a) and (b).

[0110] 5. Motor rotor comprehensive test:

[0111] First, the resistance and welding resistance are tested, then the insulation resistance, then the turn-to-turn withstand voltage, then the arc detection, and finally the withstand voltage test. If the arc detection test fails, it needs to be sorted out and handed over to the on-site technicians for processing. Only after the arc detection test passes will the last step of the motor rotor comprehensive test, the withstand voltage test, be entered. After the withstand voltage test passes, the rotor can be judged as a good product.

[0112] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A withstand voltage test device for a fine-wire motor rotor, comprising a test fixture (1), a test base assembly (2), base fixing screws (3), a safety protection door (4), a slide rail (5), a contact switch (6), a high-voltage line (7), a rotor comprehensive tester (8), a test base plate (9), a front mounting seat (10), a rear mounting seat (11) and a mounting column (12), characterized in that: The test fixture (1) is mounted on a front mounting seat (10), the test base assembly (2) is mounted on a rear mounting seat (11), and the front mounting seat (10) and the rear mounting seat (11) are fixedly mounted on a test base plate (9); the rotor comprehensive tester (8) is connected to the motor rotor via a high-voltage line (7), and the motor rotor is placed in the test fixture (1); the test base assembly (2) comprises a fixture sleeve (2-1), a test base (2-2), a positioning pin (2-3), a grounding block (2-4), a wiring terminal (2-5), and a fixture sleeve fixing screw (2-6); the test base (2-2) is fixedly mounted via the base fixing screw (3) On the rear mounting seat (11), the positioning pin (2-3) and the grounding block (2-4) are mounted in mounting grooves on the test base (2-2); the fixture sleeve (2-1) is fixedly mounted on the test base (2-2) at one end close to the test fixture (1) by means of fixture sleeve fixing screws (2-6); when the motor rotor is placed on the test fixture (1), the motor rotor commutator end chip extends into the fixture sleeve (2-1); the safety protection door (4) is mounted on the mounting column (12) by means of a slide rail (5); the mounting column (12) is fixed on the test base plate (9) and outside the front and rear mounting seats; the contact switch (6) is mounted on one side of the mounting column (12).

2. A withstand voltage test device for a fine-wire motor rotor according to claim 1, characterized in that: The clamp sleeve (2-1) is made of copper alloy material.

3. A withstand voltage test device for a fine-wire motor rotor according to claim 2, characterized in that: There are two grounding blocks (2-4), and the two grounding blocks (2-4) are symmetrically mounted on the test base (2-2).

4. The device for testing the rotor withstand voltage of a fine-wire motor according to claim 3, characterized in that: The test base (2-2) is provided with an arc-shaped groove, and the base fixing screw (3) passes through the arc-shaped groove and is threadedly connected to the rear mounting seat (11).

5. A method for withstand voltage testing of a fine-wire motor rotor, characterized in that: The test is performed using the test device as described in claim 4, and the specific steps are as follows: (a) Debug the rotor comprehensive tester, that is, set the resistance specifications, welding resistance, insulation resistance specifications, turn-to-turn withstand voltage test specifications, arc detection parameters, and high-voltage test specifications of the motor rotor to be tested; (b) Place the commutator end of the motor rotor to be tested into the test fixture (1), support the rotor chip with the test base (2-2) and fix it with the base fixing screws (3), then close the safety protection door (4), slide the safety protection door (4) over the slide rail (5) and contact the (6) contact switch, and the rotor comprehensive tester (8) performs various parameter tests through the high-voltage line (7).

6. A method for withstand voltage testing of a thin-wire motor rotor according to claim 5, characterized in that: Applicable to the withstand voltage test of AC fine-wire motor rotors before and after varnishing.

7. The method for withstand voltage testing of a fine-wire motor rotor according to claim 5, characterized in that: Applicable to withstand voltage test of DC fine-wire motor rotor before and after varnishing.

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