Emc margin test system and method for air purifier motor

Abstract

The application relates to the technical field of motor performance testing, in particular to an EMC allowance testing system and method for an air purifier motor, which solves the problem that, when the EMC allowance of the air purifier motor is tested, the motor cannot be conveniently simulated and tested under different environmental conditions, the test results cannot be effectively compared, and the test results are inaccurate, and the EMC allowance testing system for the air purifier motor comprises a test protection mechanism, a synchronous deceleration mechanism and a shaft coupling transmission mechanism, the inner side of the test protection mechanism is provided with the synchronous deceleration mechanism, the right end of the synchronous deceleration mechanism is provided with the shaft coupling transmission mechanism, the right end of the shaft coupling transmission mechanism is provided with a motor main body, and the test protection mechanism comprises a test mounting box. The motor is subjected to performance testing in the mode of applying two kinds of loads, and the motor is subjected to electromagnetic shielding opening and closing, so that the effective simulation of the motor performance testing can be effectively met, and the accuracy of the test results is improved.

Description

Technical Field

[0001] This invention relates to the field of motor performance testing technology, specifically to an EMC margin testing system and method for air purifier motors. Background Technology

[0002] Air purifiers purify air using various technologies, primarily including mechanical filtration, electrostatic dust removal, activated carbon adsorption, photocatalytic sterilization, and negative ion generation. The main function of an air purifier is to improve indoor air quality, reducing particulate matter, harmful gases, and odors, thereby alleviating allergy symptoms, reducing bacterial transmission, and improving indoor air purity and comfort. The motor in an air purifier, through its built-in motor and fan system, circulates indoor air. During the manufacturing process, the motor undergoes EMC load testing. This involves applying resistance to the motor under test, simulating its operation under load, to determine its motor compatibility performance.

[0003] Existing EMC margin tests for air purifier motors do not facilitate simulation testing under different environmental conditions, resulting in inaccurate test results and a lack of effective comparison. Therefore, they do not meet current requirements. To address this, we propose an EMC margin test system and method for air purifier motors. Summary of the Invention

[0004] The purpose of this invention is to provide an EMC margin testing system and method for air purifier motors, in order to solve the problem mentioned in the background art that existing EMC margin testing methods for air purifier motors are not convenient for simulating tests under different environmental conditions, resulting in inaccurate test results and the inability to form effective comparisons.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an EMC margin testing system for an air purifier motor, comprising a test protection mechanism, a synchronous reduction mechanism, and a coupling transmission mechanism. The synchronous reduction mechanism is installed inside the test protection mechanism, and the coupling transmission mechanism is installed at the right end of the synchronous reduction mechanism. The motor body is installed at the right end of the coupling transmission mechanism. The test protection mechanism includes a test mounting box, and a shielding box is fixedly installed inside the right end of the test mounting box. A shielding cover is rotatably connected to the upper surface of the shielding box.

[0006] The synchronous deceleration mechanism includes a guide slide plate, which is fixedly connected to the test mounting box. Two connecting sliders are slidably connected to the upper end of the guide slide plate, and an elastic column is provided between the two connecting sliders. A friction deceleration ring is fixedly installed at the upper end of the connecting slider. A tightening push block is slidably connected to the rear end of the two friction deceleration rings. An electric push rod is installed at the rear end of the tightening push block. Multiple friction plates are rotatably connected between the two friction deceleration rings. A transmission seat is fixedly installed on the inner side of the multiple friction plates. A magnet mounting sleeve is installed on the inner side of the transmission seat. Multiple magnet strips are provided between the transmission seat and the magnet mounting sleeve. A power connection mounting plate is installed at the left end of the transmission seat. An iron core winding is fixedly installed in the middle of the power connection mounting plate. An angle sensor is installed at the right end of the iron core winding. A connecting seat is installed on the left side of the power connection mounting plate.

[0007] Preferably, the coupling transmission mechanism includes a mounting sleeve, which is fixedly connected to the shielding box. A connecting plate is fixedly installed on the right side of the mounting sleeve. A coupling is rotatably connected between the mounting sleeve and the connecting plate. Four adjusting sliders are slidably connected to the right side of the connecting plate. A first adjusting rod is rotatably connected to the inner side of one end of each adjusting slider. A retaining post is installed on the inner side of the other end of each adjusting slider. A first clamping block and a second clamping block are installed between the four adjusting sliders. The first clamping block is located directly above the second clamping block. Two second adjusting rods are installed on the inner sides of both ends of the first and second clamping blocks.

[0008] Preferably, the test protection mechanism further includes a power connector fixedly connected to the right end of the test installation box. A control panel is fixedly installed on the upper surface of the test installation box. The left end of the power connector passes through the test installation box and is fixed to the inner side of the right end of the shielding box. A protective cover is rotatably connected to the upper surface of the test installation box via a hinge. Both the protective cover and the shielding cover are made of acrylic. The interior of both the shielding cover and the shielding box is filled with shielding material.

[0009] Preferably, the motor body and the four retaining columns are all locked together by nuts. The motor body is electrically connected to the electrical connector. The output end of the motor body is inserted into the inner side of the right end of the coupling and is in close contact with the middle of the first clamping block and the second clamping block. The first clamping block and the second clamping block are rotatably connected to the connecting disc. The two ends of the second adjusting rod are provided with external threads with opposite directions of rotation. The two ends of the second adjusting rod are threadedly connected to the first clamping block and the second clamping block. The first clamping block and the second clamping block slide linearly back and forth along the axis of the second adjusting rod.

[0010] Preferably, one end of the first adjusting rod passes through the connecting plate and is threadedly connected to the adjusting slider. All four adjusting sliders slide linearly back and forth along the radial direction of the connecting plate. The left end of the retaining column passes through the motor body and is threadedly connected to the adjusting slider. The axes of the four retaining columns are parallel.

[0011] Preferably, the left end of the coupling passes through the shielding box and is fixedly connected to the transmission seat. The transmission seat is rotatably connected to the power connection mounting plate. The power connection mounting plate is fixedly connected to the test mounting box through a connecting seat. The iron core winding is fixedly connected to the angle sensor. The right side of the angle sensor is in close contact with the transmission seat.

[0012] Preferably, the magnet mounting sleeve is fixedly connected to the transmission seat by screws, and the plurality of magnet strips are arranged in a circle relative to the axis of the transmission seat, and the magnetic poles of the plurality of magnet strips are consistent.

[0013] Preferably, the plurality of friction plates are arranged circumferentially relative to the axis of the transmission seat, the outer surface of the friction plates is provided with a plurality of heat dissipation grooves, the two friction deceleration rings are provided with wear-resistant textures on the adjacent side, the electric push rod is fixedly connected to the test mounting box, the output end of the electric push rod is fixedly connected to the tightening push block, the front end of the tightening push block is provided with two guide slopes, and the two friction deceleration rings are in close contact with the tightening push block through the guide slopes.

[0014] Preferably, the upper end face of the guide slide is provided with a groove, the bottom end of the connecting slider is inserted into the inner side of the groove, both ends of the elastic column are bonded and fixed to the two connecting sliders, and the two connecting sliders slide in opposite directions along the axis of the elastic column.

[0015] A method for testing the EMC margin of an air purifier motor, comprising the following steps:

[0016] S1: Adjust the position of the four retaining posts according to the size of the motor body to be tested. Specifically, one end of the first adjusting rod passes through the connecting plate and is connected to the adjusting slider by a thread. By rotating the first adjusting rod, the adjusting slider and retaining posts can be slidably adjusted along the radial direction of the connecting plate. Thus, the four retaining posts can be inserted and installed on the motor body to be tested and locked and fixed by nuts. At the same time, the two second adjusting rods are rotated, so that the second adjusting rods drive the first clamping block and the second clamping block to slide in opposite directions. Thus, the first clamping block and the second clamping block can lock the output end of the motor body to the right end of the coupling, thereby satisfying the fixed installation and testing of motor bodies of different sizes.

[0017] S2: Connect the power supply and start the motor body. The output end of the motor body drives the coupling to rotate inside the mounting sleeve and connecting plate through the first and second clamping blocks. Then, the coupling drives the friction plate, magnet strip and magnet mounting sleeve to rotate synchronously through the transmission seat. Start the electric push rod. Under the support of the test mounting box, the electric push rod drives the tightening push block to move horizontally and push the two friction reduction rings. The bottom end of the friction reduction ring is slidably connected to the test mounting box through the connecting slider.

[0018] S3: Then, the two friction reduction rings can move towards each other and come into contact with the sides of multiple friction plates through the connecting slider under the guidance of the guide plate. At this time, the friction contact between the two friction reduction rings and multiple friction plates can reduce the speed of the transmission seat, and then apply a load to the motor body through the coupling. By adjusting the distance between the two friction reduction rings, the load applied to the motor body can be controlled, and the motor body can be accurately tested.

[0019] S4: The elastic column can provide elastic support when the tightening push block separates from the two friction deceleration rings, which facilitates the automatic separation and reset of the two magnet strips from the friction plate. At this time, the shielding cover is closed to the upper end of the shielding box, and the iron core winding is energized.

[0020] S5: Furthermore, the iron core winding can apply a load in the opposite direction to the magnet mounting sleeve and transmission seat through the magnet strip, which is relative to the rotation of the transmission seat driven by the motor body. This enables the testing of the motor body. The shielding cover and the inside of the shielding box are filled with shielding material, which can effectively shield the motor body electromagnetically, thereby improving the testing accuracy of the motor body and realizing the EMC margin test of the motor body.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention, by rotating the first adjusting rod, can drive the adjusting slider and retaining column to slide and adjust radially along the connecting plate. The four retaining columns can then be inserted and installed onto the motor body to be tested, and locked in place with nuts. The second adjusting rod drives the first and second clamping blocks to slide towards each other, thereby locking the output end of the motor body to the right end of the coupling. This satisfies the need for fixing, installing, and testing motor bodies of different sizes. The electric push rod drives the tightening push block to move horizontally and pushes the two friction reduction rings, which then come into contact with the sides of multiple friction plates, thus reducing the speed of the transmission seat and applying a load to the motor body through the coupling.

[0023] 2. This invention allows for control of the load applied to the motor body by adjusting the spacing between the two friction reduction rings, thereby enabling precise testing of the motor body. The elastic column provides elastic support when the tightening push block separates from the two friction reduction rings, facilitating the automatic separation and reset of the two magnet strips from the friction plates. When the core winding is energized, the magnet strips apply a load in the opposite direction to the magnet mounting sleeve and transmission seat during the rotation of the transmission seat driven by the motor body, thus enabling testing of the motor body. The shielding cover and shielding box are filled with shielding material, effectively providing electromagnetic shielding for the motor body, thereby improving the accuracy of motor body testing and enabling EMC margin testing of the motor body. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a cross-sectional structural diagram of the test protection mechanism of the present invention;

[0026] Figure 3 This is a schematic diagram of the mounting structure of the motor body of the present invention;

[0027] Figure 4 This is a schematic diagram of the coupling transmission mechanism of the present invention;

[0028] Figure 5 This is a cross-sectional structural diagram of the coupling transmission mechanism of the present invention;

[0029] Figure 6 This is a cross-sectional structural diagram of the synchronous deceleration mechanism of the present invention;

[0030] Figure 7 This is a cross-sectional structural diagram of the transmission seat of the present invention.

[0031] In the diagram: 1. Test protection mechanism; 101. Test mounting box; 102. Control panel; 103. Power connector; 104. Protective cover; 105. Shielding cover; 106. Shielding box; 2. Synchronous deceleration mechanism; 201. Guide slide plate; 202. Connecting slider; 203. Friction deceleration ring; 204. Transmission seat; 205. Electric push rod; 206. Tightening push block; 207. Power mounting plate; 208. Connecting seat; 209. 1. Iron core winding; 210. Angle sensor; 211. Elastic column; 212. Friction plate; 213. Magnet strip; 214. Magnet mounting sleeve; 3. Coupling transmission mechanism; 301. Mounting sleeve; 302. Connecting plate; 303. First adjusting rod; 304. Adjusting slider; 305. Holding column; 306. Second adjusting rod; 307. First clamping block; 308. Second clamping block; 309. Coupling; 4. Motor body. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Please see Figures 1 to 7 This invention provides an embodiment of an EMC margin testing system for an air purifier motor, comprising a test protection mechanism 1, a synchronous reduction mechanism 2, and a coupling transmission mechanism 3. The test protection mechanism 1 includes a test mounting box 101, a shielding box 106 fixedly mounted on the inner side of the right end of the test mounting box 101, a shielding cover 105 rotatably connected to the upper end of the shielding box 106, a power connector 103 fixedly connected to the right end of the test mounting box 101, a control panel 102 fixedly mounted on the upper end of the test mounting box 101, and the left end of the power connector 103 penetrating the test mounting box 101 and fixed to the inner side of the right end of the shielding box 106. A protective cover 104 is rotatably connected to the upper end of the test mounting box 101 via a hinge. Both the protective cover 104 and the shielding cover 105 are made of acrylic. The interiors of the shielding cover 105 and the shielding box 106 are filled with shielding material. The shielding cover 105 and the shielding box 106 can effectively provide electromagnetic shielding for the motor body 4, thereby improving the testing accuracy of the motor body 4.

[0034] Please see Figures 1 to 7 The inner side of the test protection mechanism 1 is equipped with a synchronous deceleration mechanism 2. The synchronous deceleration mechanism 2 includes a guide slide plate 201, which is fixedly connected to the test mounting box 101. Two connecting sliders 202 are slidably connected to the upper end surface of the guide slide plate 201. An elastic column 211 is provided between the two connecting sliders 202. The upper end surface of the guide slide plate 201 is provided with a groove. The bottom end of the connecting slider 202 is inserted into the inner side of the groove. Both ends of the elastic column 211 are bonded and fixed to the two connecting sliders 202. The two connecting sliders 202 slide in opposite directions along the axis of the elastic column 211. The elastic column 211 can provide elastic support when the tightening push block 206 is separated from the two friction deceleration rings 203, thereby facilitating the automatic separation and reset of the two magnet strips 213 from the friction plate 212.

[0035] A friction deceleration ring 203 is fixedly installed on the upper end of the connecting slider 202. A tightening push block 206 is slidably connected to the rear end of the two friction deceleration rings 203. An electric push rod 205 is installed on the rear end of the tightening push block 206. The electric push rod 205 is fixedly connected to the test mounting box 101. The output end of the electric push rod 205 is fixedly connected to the tightening push block 206. The front end of the tightening push block 206 is provided with two guide slopes. Both friction deceleration rings 203 are in contact with the tightening push block 206 through the guide slopes, so that the electric push rod 205 drives the tightening push block 206 to move horizontally and pushes the two friction deceleration rings 203. Then, the two friction deceleration rings 203 can move towards each other under the guidance of the guide slide plate 201 through the connecting slider 202.

[0036] Multiple friction plates 212 are rotatably connected between two friction reduction rings 203. A transmission seat 204 is fixedly mounted on the inner side of the friction plates 212. The friction plates 212 are arranged circumferentially relative to the axis of the transmission seat 204. Multiple heat dissipation grooves are provided on the outer surface of the friction plates 212. Wear-resistant grooves are provided on the side of the two friction reduction rings 203 that are close to each other. The frictional contact between the two friction reduction rings 203 and the multiple friction plates 212 can reduce the speed of the transmission seat 204, thereby applying a load to the motor body 4 through the coupling 309. The load amount can be adjusted by adjusting the distance between the two friction reduction rings 203. The motor body 4 can be precisely tested by controlling the motor body 4. A magnet mounting sleeve 214 is installed on the inner side of the transmission seat 204. Multiple magnet strips 213 are provided between the transmission seat 204 and the magnet mounting sleeve 214. The magnet mounting sleeve 214 and the transmission seat 204 are fixedly connected by screws. The multiple magnet strips 213 are arranged in a circle relative to the axis of the transmission seat 204. The magnetic poles of the multiple magnet strips 213 are consistent. The iron core winding 209 can apply a load in the opposite direction to the magnet mounting sleeve 214 and the transmission seat 204 through the magnet strips 213, which is relative to the rotation of the transmission seat 204 driven by the motor body 4. This allows the motor body 4 to be tested.

[0037] A power connection mounting plate 207 is installed on the left end of the transmission base 204. An iron core winding 209 is fixedly installed in the middle of the power connection mounting plate 207. An angle sensor 210 is installed on the right end of the iron core winding 209. A connecting seat 208 is installed on the left side of the power connection mounting plate 207. The transmission base 204 is rotatably connected to the power connection mounting plate 207. The power connection mounting plate 207 is fixedly connected to the test mounting box 101 through the connecting seat 208. The iron core winding 209 is fixedly connected to the angle sensor 210. The right side of the angle sensor 210 is in close contact with the transmission base 204. The angle sensor 210 can monitor the speed of the motor body 4 under different loads.

[0038] Please see Figures 1 to 7A coupling transmission mechanism 3 is installed at the right end of the synchronous reduction mechanism 2. The coupling transmission mechanism 3 includes a mounting sleeve 301, which is fixedly connected to the shielding box 106. A connecting plate 302 is fixedly installed on the right side of the mounting sleeve 301. A coupling 309 is rotatably connected between the mounting sleeve 301 and the connecting plate 302. The left end of the coupling 309 passes through the shielding box 106 and is fixedly connected to the transmission seat 204. Four adjusting sliders 304 are slidably connected to the right side of the connecting plate 302. A first adjusting rod is rotatably connected to the inner side of one end of each adjusting slider 304. 303, a retaining column 305 is installed on the inner side of the other end of the adjusting slider 304. The motor body 4 is installed on the right end of the coupling transmission mechanism 3. The motor body 4 and the four retaining columns 305 are all locked together by nuts. One end of the first adjusting rod 303 passes through the connecting plate 302 and is connected to the adjusting slider 304 by a thread. The four adjusting sliders 304 slide linearly back and forth along the radial direction of the connecting plate 302. The left end of the retaining column 305 passes through the motor body 4 and is connected to the adjusting slider 304 by a thread. The axes of the four retaining columns 305 are parallel.

[0039] A first clamping block 307 and a second clamping block 308 are installed between four adjusting sliders 304. The first clamping block 307 is located directly above the second clamping block 308. Two second adjusting rods 306 are installed on the inner sides of both ends of the first clamping block 307 and the second clamping block 308. The motor body 4 is electrically connected to the electrical connector 103. The output end of the motor body 4 is inserted into the inner side of the right end of the coupling 309 and is in contact with the middle of the first clamping block 307 and the second clamping block 308. Both the first clamping block 307 and the second clamping block 308 are rotatably connected to the connecting plate 302. The two ends of the second adjusting rod 306 are provided with external threads with opposite directions of rotation. Both ends of the second adjusting rod 306 are threadedly connected to the first clamping block 307 and the second clamping block 308. The first clamping block 307 and the second clamping block 308 slide linearly back and forth along the axis of the second adjusting rod 306.

[0040] A method for testing the EMC margin of an air purifier motor, comprising the following steps:

[0041] S1: The positions of the four retaining posts 305 are adjusted according to the size of the motor body 4 to be tested. Specifically, one end of the first adjusting rod 303 passes through the connecting plate 302 and is connected to the adjusting slider 304 by a thread. By rotating the first adjusting rod 303, the adjusting slider 304 and the retaining posts 305 can be slidably adjusted along the radial direction of the connecting plate 302. Thus, the four retaining posts 305 can be inserted and installed on the motor body 4 to be tested and locked and fixed by nuts. At the same time, the two second adjusting rods 306 are rotated, so that the second adjusting rods 306 drive the first clamping block 307 and the second clamping block 308 to slide towards each other. Thus, the first clamping block 307 and the second clamping block 308 can lock the output end of the motor body 4 to the right end of the coupling 309, thereby satisfying the fixed installation and testing of motor bodies 4 of different sizes.

[0042] S2: Connect the power supply and start the motor body 4. The output end of the motor body 4 drives the coupling 309 to rotate inside the mounting sleeve 301 and the connecting plate 302 through the first clamping block 307 and the second clamping block 308. Then, the coupling 309 drives the friction plate 212, the magnet strip 213 and the magnet mounting sleeve 214 to rotate synchronously through the transmission seat 204. Start the electric push rod 205. Under the support of the test mounting box 101, the electric push rod 205 drives the tightening push block 206 to move horizontally and push the two friction deceleration rings 203. The bottom end of the friction deceleration ring 203 is slidably connected to the test mounting box 101 through the connecting slider 202.

[0043] S3: Subsequently, the two friction reduction rings 203 can move towards each other and come into contact with the sides of the multiple friction plates 212 under the guidance of the guide slide plate 201 through the connecting slider 202. At this time, the friction contact between the two friction reduction rings 203 and the multiple friction plates 212 can reduce the speed of the transmission seat 204, and then apply a load to the motor body 4 through the coupling 309. By adjusting the distance between the two friction reduction rings 203, the load applied to the motor body 4 can be controlled, and the motor body 4 can be accurately tested.

[0044] S4: The elastic column 211 can provide elastic support when the tightening push block 206 is separated from the two friction deceleration rings 203, which facilitates the automatic separation and reset of the two magnet strips 213 from the friction plate 212. At this time, the shielding cover 105 is closed on the upper end of the shielding box 106, and the iron core winding 209 is energized.

[0045] S5: Furthermore, the iron core winding 209 can apply a load in the opposite direction to the magnet mounting sleeve 214 and the transmission seat 204 during the rotation of the transmission seat 204 driven by the motor body 4 through the magnet strip 213, thereby enabling the motor body 4 to be tested. The shielding cover 105 and the shielding box 106 are filled with shielding material, thereby effectively shielding the motor body 4 electromagnetically, thereby improving the test accuracy of the motor body 4 and realizing the EMC margin test of the motor body 4.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An EMC margin testing system for an air purifier motor, comprising a test protection mechanism (1), a synchronous reduction mechanism (2), and a coupling transmission mechanism (3), characterized in that: The test protection mechanism (1) is equipped with a synchronous deceleration mechanism (2) on its inner side. The synchronous deceleration mechanism (2) is equipped with a coupling transmission mechanism (3) on its right end. The coupling transmission mechanism (3) is equipped with a motor body (4) on its right end. The test protection mechanism (1) includes a test mounting box (101). A shielding box (106) is fixedly installed on the inner side of the right end of the test mounting box (101). A shielding cover (105) is rotatably connected to the upper end of the shielding box (106). The synchronous deceleration mechanism (2) includes a guide slide plate (201), which is fixedly connected to the test mounting box (101). Two connecting sliders (202) are slidably connected to the upper end face of the guide slide plate (201). An elastic column (211) is provided between the two connecting sliders (202). Friction deceleration rings (203) are fixedly installed on the upper end of the connecting sliders (202). A tightening push block (206) is slidably connected to the rear end of the two friction deceleration rings (203). An electric push rod (205) is installed at the rear end of the tightening push block (206). The two friction deceleration rings (203) rotate between each other. A plurality of friction plates (212) are connected, and a transmission seat (204) is fixedly installed on the inner side of the plurality of friction plates (212). A magnet mounting sleeve (214) is installed on the inner side of the transmission seat (204). A plurality of magnet strips (213) are provided between the transmission seat (204) and the magnet mounting sleeve (214). A power connection mounting plate (207) is installed on the left end of the transmission seat (204). An iron core winding (209) is fixedly installed in the middle of the power connection mounting plate (207). An angle sensor (210) is installed on the right end of the iron core winding (209). A connecting seat (208) is installed on the left side of the power connection mounting plate (207). The coupling transmission mechanism (3) includes a mounting sleeve (301), which is fixedly connected to the shielding box (106). A connecting plate (302) is fixedly installed on the right side of the mounting sleeve (301). A coupling (309) is rotatably connected between the mounting sleeve (301) and the connecting plate (302). Four adjusting sliders (304) are slidably connected to the right side of the connecting plate (302). A first adjusting rod (303) is rotatably connected to the inner side of one end of the adjusting slider (304). A retaining column (305) is installed on the inner side of the other end of the adjusting slider (304). A first pressing block (307) and a second pressing block (308) are installed between the four adjusting sliders (304). The first pressing block (307) is located directly above the second pressing block (308). Two second adjusting rods (306) are installed on the inner sides of both ends of the first pressing block (307) and the second pressing block (308).

2. The EMC margin testing system for an air purifier motor according to claim 1, characterized in that: The test protection mechanism (1) also includes a power connector (103) fixedly connected to the right end of the test installation box (101). A control panel (102) is fixedly installed on the upper surface of the test installation box (101). The left end of the power connector (103) passes through the test installation box (101) and is fixed to the inner side of the right end of the shielding box (106). A protective cover (104) is rotatably connected to the upper surface of the test installation box (101) via a hinge. The protective cover (104) and the shielding cover (105) are both made of acrylic. The shielding cover (105) and the shielding box (106) are both filled with shielding material.

3. The EMC margin testing system for an air purifier motor according to claim 2, characterized in that: The motor body (4) and four retaining columns (305) are all locked and installed by nuts. The motor body (4) is electrically connected to the electrical connector (103). The output end of the motor body (4) is inserted into the inner side of the right end of the coupling (309) and is in contact with the middle of the first clamping block (307) and the second clamping block (308). The first clamping block (307) and the second clamping block (308) are rotatably connected to the connecting plate (302). The two ends of the second adjusting rod (306) are provided with external threads with opposite directions of rotation. The two ends of the second adjusting rod (306) are threadedly connected to the first clamping block (307) and the second clamping block (308). The first clamping block (307) and the second clamping block (308) slide linearly back and forth along the axis of the second adjusting rod (306).

4. The EMC margin testing system for an air purifier motor according to claim 3, characterized in that: One end of the first adjusting rod (303) passes through the connecting plate (302) and is connected to the adjusting slider (304) by a thread. All four adjusting sliders (304) slide linearly back and forth along the radial direction of the connecting plate (302). The left end of the retaining column (305) passes through the motor body (4) and is connected to the adjusting slider (304) by a thread. The axes of the four retaining columns (305) are parallel.

5. The EMC margin testing system for an air purifier motor according to claim 4, characterized in that: The left end of the coupling (309) passes through the shielding box (106) and is fixedly connected to the transmission seat (204). The transmission seat (204) is rotatably connected to the power connection mounting plate (207). The power connection mounting plate (207) is fixedly connected to the test mounting box (101) through the connecting seat (208). The iron core winding (209) is fixedly connected to the angle sensor (210). The right side of the angle sensor (210) is in contact with the transmission seat (204).

6. The EMC margin testing system for an air purifier motor according to claim 5, characterized in that: The magnet mounting sleeve (214) is fixedly connected to the transmission seat (204) by screws. The multiple magnet strips (213) are arranged in a circle relative to the axis of the transmission seat (204), and the magnetic poles of the multiple magnet strips (213) are consistent.

7. The EMC margin testing system for an air purifier motor according to claim 6, characterized in that: Multiple friction plates (212) are arranged circumferentially relative to the axis of the transmission seat (204). Multiple heat dissipation grooves are provided on the outer surface of the friction plates (212). Wear-resistant textures are provided on the side of the two friction deceleration rings (203) that are close to each other. The electric push rod (205) is fixedly connected to the test installation box (101). The output end of the electric push rod (205) is fixedly connected to the tightening push block (206). The front end of the tightening push block (206) is provided with two guide slopes. Both friction deceleration rings (203) are in contact with the tightening push block (206) through the guide slopes.

8. The EMC margin testing system for an air purifier motor according to claim 7, characterized in that: The upper surface of the guide slide plate (201) is provided with a groove, the bottom end of the connecting slider (202) is inserted into the inner side of the groove, and both ends of the elastic column (211) are bonded and fixed to the two connecting sliders (202). The two connecting sliders (202) slide in opposite directions along the axis of the elastic column (211).

9. A method for testing the EMC margin of an air purifier motor, characterized in that: Includes the following steps: S1: Adjust the position of the four retaining columns (305) according to the size of the motor body (4) to be tested. Specifically, one end of the first adjusting rod (303) passes through the connecting plate (302) and is connected to the adjusting slider (304) by thread. By rotating the first adjusting rod (303), the adjusting slider (304) and retaining column (305) can be slidably adjusted along the radial direction of the connecting plate (302). Thus, the four retaining columns (305) can be plugged into the motor body (4) to be tested and locked with nuts. At the same time, rotate the two second adjusting rods (306) so that the second adjusting rods (306) drive the first clamping block (307) and the second clamping block (308) to slide towards each other. Thus, the first clamping block (307) and the second clamping block (308) can lock the output end of the motor body (4) and the right end of the coupling (309). Thus, the fixed installation and testing of motor bodies (4) of different sizes can be satisfied. S2: Connect the power supply and start the motor body (4). The output end of the motor body (4) drives the coupling (309) to rotate inside the mounting sleeve (301) and connecting plate (302) through the first clamping block (307) and the second clamping block (308). Then the coupling (309) drives the friction plate (212), magnet strip (213) and magnet mounting sleeve (214) to rotate synchronously through the transmission seat (204). Start the electric push rod (205). Under the support of the test mounting box (101), the electric push rod (205) drives the tightening push block (206) to move horizontally and push the two friction deceleration rings (203). The bottom end of the friction deceleration ring (203) is slidably connected to the test mounting box (101) through the connecting slider (202). S3: The two friction reduction rings (203) can move towards each other and come into contact with the sides of the multiple friction plates (212) under the guidance of the guide slide plate (201) through the connecting slider (202). At this time, the friction contact between the two friction reduction rings (203) and the multiple friction plates (212) can reduce the speed of the transmission seat (204), and then apply a load to the motor body (4) through the coupling (309). By adjusting the distance between the two friction reduction rings (203), the load applied to the motor body (4) can be controlled, and the motor body (4) can be accurately tested. S4: The elastic column (211) can provide elastic support when the tightening push block (206) is separated from the two friction deceleration rings (203), which facilitates the automatic separation and reset of the two magnet strips (213) from the friction plate (212). At this time, the shielding cover (105) is closed on the upper end of the shielding box (106) and the iron core winding (209) is energized. S5: Furthermore, the iron core winding (209) can apply a load in the opposite direction to the magnet mounting sleeve (214) and the transmission seat (204) through the magnet strip (213) during the rotation of the transmission seat (204) driven by the motor body (4), thereby enabling the motor body (4) to be tested. The shielding cover (105) and the shielding box (106) are filled with shielding material, thereby effectively shielding the motor body (4) electromagnetically, thereby improving the test accuracy of the motor body (4) and realizing the EMC margin test of the motor body (4).

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