An EMC testing device for loaded motors that is unaffected by external electromagnetic fields.

Abstract

This utility model relates to an EMC testing device for a loaded motor that is unaffected by external electromagnetic interference, belonging to the field of motor testing technology. It includes a base, a coupling mounted on the base, a reduction worm gear fixedly mounted on the output shaft of the coupling, a mounting bracket fixedly mounted on one side of the base, the reduction worm gear rotatably mounted on the mounting bracket, an adjusting bracket at the bottom of the mounting bracket, and a connecting shaft rotatably mounted on the adjusting bracket. A mechanical damper and a reduction worm gear are detachably mounted on the connecting shaft. The mechanical damper is detachably connected to the adjusting bracket, and the reduction worm gear meshes with the reduction worm gear. This application improves the accuracy of motor EMC testing.

Description

Technical Field

[0001] This utility model relates to the field of motor testing technology, and in particular to an EMC testing device for a loaded motor that is not affected by external electromagnetic fields. Background Technology

[0002] EMC testing, also known as electromagnetic compatibility testing, is a comprehensive evaluation of a device's resistance to electromagnetic interference and its ability to resist interference.

[0003] Currently, motor EMC load testing involves mechanically connecting the motor under test (MAT) to a magnetic powder brake via a coupling. The magnetic powder brake provides resistance to the operation of the MAT, simulating its operation under load, thereby detecting the motor compatibility performance of the MAT under load.

[0004] However, the magnetic powder brake needs to be energized to provide resistance to the operation of the motor under test. Changes in current and voltage within the magnetic powder brake can generate radiated interference, thereby affecting the accuracy of the electromagnetic compatibility performance data of the motor under test. Utility Model Content

[0005] To improve the accuracy of EMC testing for motors, this application provides a load-bearing motor EMC testing device that is unaffected by external electromagnetic fields.

[0006] The EMC testing equipment for a loaded motor that is unaffected by external electromagnetic fields provided in this application adopts the following technical solution: An EMC testing device for a loaded motor unaffected by external electromagnetic interference includes a base, a coupling mounted on the base, a reduction worm gear fixedly mounted on the output shaft of the coupling, a mounting bracket fixedly mounted on one side of the base, the reduction worm gear rotatably mounted on the mounting bracket, an adjusting bracket mounted at the bottom of the mounting bracket, a connecting shaft rotatably mounted on the adjusting bracket, a mechanical damper and a reduction worm gear detachably mounted on the connecting shaft, the mechanical damper being detachably connected to the adjusting bracket, and the reduction worm gear meshing with the reduction worm gear.

[0007] By adopting the above technical solution, when performing EMC testing on the motor under test, the motor under test is mounted on a base, and the output shaft of the motor under test is connected to the input shaft of the coupling. Based on the rated load torque and speed of the motor, the reduction worm gear and mechanical damper are replaced. When the motor under test is running, it drives the reduction worm gear to rotate, which in turn drives the reduction worm wheel to rotate. The rotation of the reduction worm wheel drives the connecting shaft to rotate. The mechanical damper provides resistance to the operation of the motor under test, simulating its operating state under load, thereby detecting the motor compatibility performance of the motor under test under load. Since the mechanical damper does not require power, it will not generate radiated interference that affects the accuracy of the EMC performance data of the motor under test, thus improving the accuracy of the motor EMC test.

[0008] Preferably, the mounting bracket has an adjustment circular hole on one side facing the adjustment bracket, and an adjustment screw is threaded into the adjustment circular hole. Several adjustment elongated holes are formed through the adjustment bracket, and the adjustment screw passes through the adjustment elongated holes. An adjustment end is fixedly provided at one end of the adjustment screw outside the adjustment circular hole, and the adjustment end is used to abut against the adjustment bracket.

[0009] By adopting the above technical solution, when adjusting the center distance between the reduction worm gear and the reduction worm, the adjusting screw is loosened, causing the adjusting bracket and the mounting bracket to move relative to each other along the adjusting elongated hole, thereby adjusting the center distance between the reduction worm gear and the reduction worm. When the center distance between the reduction worm gear and the reduction worm is adjusted to a suitable distance, the adjusting screw is rotated so that the adjusting end abuts against the adjusting bracket, achieving the effect of locking the adjusting bracket and the mounting bracket.

[0010] Preferably, a D-shaped worm gear hole is formed through the reduction worm gear, and a D-shaped worm gear shaft is inserted into the D-shaped worm gear hole. The inner wall of the D-shaped worm gear hole and the outer wall of the D-shaped worm gear shaft fit together. The bottom of the D-shaped worm gear shaft is fixedly connected to the top of the connecting shaft. A locking screw is fixedly installed on the top of the D-shaped worm gear shaft, and a locking nut is threaded onto the locking screw. The bottom of the locking nut abuts against the top of the reduction worm gear, and the bottom of the reduction worm gear abuts against the top of the connecting shaft.

[0011] By adopting the above technical solution, when replacing the reduction worm gear, first loosen the locking nut to remove it from the locking screw, then remove the old reduction worm gear, then put the new reduction worm gear on the D-type worm gear shaft, and finally thread the locking nut onto the locking screw so that the locking nut abuts against the reduction worm gear. Since the inner wall of the D-type worm gear hole and the outer wall of the D-type worm gear shaft fit together, when the reduction worm gear rotates, the worm gear drives the D-type worm gear shaft to rotate synchronously, and the D-type worm gear shaft drives the connecting shaft to rotate synchronously.

[0012] Preferably, a ring plate is fixedly installed at the top of the connecting shaft, the ring plate is fixedly connected to the connecting shaft, a bearing shaft is fixedly installed at the top of the ring plate, the top of the bearing shaft is fixedly connected to the bottom of the D-type worm gear shaft, a set of needle roller bearings and a bearing pressure plate are sleeved on the bearing shaft, the needle roller bearings abut against the ring plate and the reduction worm gear, the bearing pressure plate abuts against the needle roller bearings, and the bearing pressure plate is detachably connected to the adjusting bracket.

[0013] By adopting the above technical solution, when the reduction worm gear is installed on the D-type worm gear shaft, the needle roller bearing abuts between the ring plate and the reduction worm gear, and the needle roller bearing reduces the axial friction of the reduction worm gear.

[0014] Preferably, the bearing pressure plate has an upper threaded hole, and the adjusting bracket has a lower threaded hole. A connecting bolt is provided in both the upper and lower threaded holes. The connecting bolt passes through the upper threaded hole and is threadedly connected to the lower threaded hole.

[0015] By adopting the above technical solution, the bearing pressure plate and the adjusting bracket can be detachably connected by connecting bolts.

[0016] Preferably, a through hole is formed in the adjusting bracket, a deep groove ball bearing is installed in the through hole, the deep groove ball bearing is sleeved on the connecting shaft, the deep groove ball bearing is interference-fitted with the connecting shaft, and the inner ring of the deep groove ball bearing abuts against the bottom of the ring plate.

[0017] By adopting the above technical solution, deep groove ball bearings reduce the frictional resistance when the connecting shaft rotates.

[0018] Preferably, a damping square rod is fixedly installed at the bottom of the connecting shaft, and the mechanical damper is sleeved on the damping square rod, with the side wall of the damping square rod abutting against the mechanical damper.

[0019] By adopting the above technical solution, the mechanical damper is connected to the connecting shaft through the damping square rod. When the connecting shaft rotates and drives the damping square rod to rotate, the damping square rod causes the solid parts in contact with each other in the mechanical damper to move relative to each other, generating frictional resistance.

[0020] Preferably, the mechanical damper has several mounting plates fixedly installed on its sidewall, with mounting holes through the mounting plates and mounting bolts inserted into the mounting holes. The adjusting bracket has several mounting slots, and the mounting bolts are threadedly connected to the mounting slots.

[0021] By adopting the above technical solution, the mechanical damper and the adjustment bracket can be detachably connected by mounting bolts.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a base, coupling, reduction worm gear, mounting bracket, adjusting bracket, connecting shaft, mechanical damper, and reduction worm wheel, the mechanical damper provides resistance to the operation of the motor under test, simulating the operating state of the motor under test under load, thereby detecting the motor compatibility performance of the motor under test under load. Since the mechanical damper does not need to be energized, it will not generate radiated interference that affects the accuracy of the electromagnetic compatibility performance data of the motor under test, thus improving the accuracy of motor EMC testing. 2. By setting adjustment holes, adjustment screws, adjustment elongated holes, and adjustment ends, the center distance between the reduction worm gear and the reduction worm can be easily adjusted; 3. By setting a D-type worm gear hole, a D-type worm gear shaft, a locking screw, and a locking nut, the reduction worm gear and the connecting shaft can be detachably connected. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a load-bearing motor EMC testing device that is unaffected by external electromagnetic fields, as described in an embodiment of this application.

[0024] Figure 2 This is a cross-sectional view illustrating the positional relationship between the reduction worm gear and the mechanical damper in an embodiment of this application.

[0025] Figure 3 This is a cross-sectional view illustrating the connection relationship between the mounting bracket and the adjusting bracket in the embodiments of this application.

[0026] Figure 4 This is a cross-sectional view illustrating the positional relationship between the reduction worm gear and the D-type worm gear shaft in the embodiments of this application.

[0027] Figure 5 This is a cross-sectional view illustrating the connection between the bearing pressure plate and the adjusting bracket in the embodiments of this application.

[0028] Figure 6 This is a cross-sectional view illustrating the connection between the mechanical damper and the adjusting bracket in the embodiments of this application.

[0029] Figure 7 This is a cross-sectional view illustrating the positional relationship between the mechanical damper and the damping rod in the embodiments of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Base; 11. Mounting bracket; 12. Adjusting bracket; 2. Coupling; 21. Reduction worm gear; 22. Reduction worm wheel; 3. Connecting shaft; 31. Deep groove ball bearing; 32. Through hole; 4. Mechanical damper; 41. Damping square rod; 5. Adjusting screw; 51. Adjusting round hole; 52. Adjusting elongated hole; 53. Adjusting end; 6. D-type worm wheel shaft; 61. D-type worm wheel hole; 62. Locking screw; 63. Locking nut; 7. Bearing shaft; 71. Ring plate; 72. Needle roller bearing; 73. Bearing pressure plate; 8. Connecting bolt; 81. Upper threaded hole; 82. Lower threaded hole; 9. Mounting bolt; 91. Mounting hole; 92. Mounting groove; 93. Mounting plate. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0032] This application discloses an EMC testing device for a loaded motor that is unaffected by external electromagnetic fields. (Refer to...) Figure 1 and Figure 2 The system includes a base 1, with a mounting bracket 11 fixedly mounted on one side of the base 1. A reduction worm gear 21 is rotatably mounted on the mounting bracket 11, and a coupling 2 is mounted on the base 1, with the output shaft of the coupling 2 connected to the reduction worm gear 21. When performing EMC testing on the motor under test, the motor is mounted on the base 1, and its output shaft is connected to the input shaft of the coupling 2. An adjusting bracket 12 is mounted at the bottom of the mounting bracket 11, with a connecting shaft 3 rotatably mounted on the adjusting bracket 12. A mechanical damper 4 and a reduction worm gear 22 are detachably mounted on the connecting shaft 3. The mechanical damper 4 is detachably connected to the adjusting bracket 12, and the reduction worm gear 22 meshes with the reduction worm gear 21. The reduction worm gear 22 and the mechanical damper 4 are replaced according to the rated load torque and speed of the motor. When the motor under test (DUT) is running, it drives the reduction worm gear 21 to rotate, which in turn drives the reduction worm wheel 22. The rotation of the reduction worm wheel 22 then drives the connecting shaft 3 to rotate. The mechanical damper 4 provides resistance to the operation of the DUT, simulating its operation under load, thereby detecting the motor compatibility performance of the DUT under load. Since the mechanical damper 4 does not require power, it does not generate radiated interference that could affect the accuracy of the DUT's electromagnetic compatibility performance data, thus improving the accuracy of the motor's EMC testing.

[0033] Reference Figures 1 to 3An adjustment hole 51 is provided on the side of the mounting bracket 11 facing the adjustment bracket 12, and an adjustment screw 5 is internally threaded into the adjustment hole 51. Several elongated adjustment holes 52 are provided through the adjustment bracket 12, and the adjustment screw 5 passes through these holes. An adjustment end 53 is integrally formed at one end of the adjustment screw 5 outside the adjustment hole 51, and this end 53 abuts against the adjustment bracket 12. When adjusting the center distance between the reduction worm gear 22 and the reduction worm 21, the adjustment screw 5 is loosened, causing the adjustment bracket 12 and the mounting bracket 11 to move relative to each other along the elongated adjustment holes 52, thereby adjusting the center distance between the reduction worm gear 22 and the reduction worm 21. After the center distance between the reduction worm gear 22 and the reduction worm 21 is adjusted to a suitable distance, the adjustment screw 5 rotates, causing the adjustment end 53 to abut against the adjustment bracket 12, achieving a locking effect between the adjustment bracket 12 and the mounting bracket 11.

[0034] Reference Figure 2 and Figure 4 A D-shaped worm gear hole 61 is formed through the reduction worm gear 22, and a D-shaped worm gear shaft 6 is inserted into the D-shaped worm gear hole 61. The inner wall of the D-shaped worm gear hole 61 and the outer wall of the D-shaped worm gear shaft 6 are in close contact. Because the inner wall of the D-shaped worm gear hole 61 and the outer wall of the D-shaped worm gear shaft 6 are in close contact, when the reduction worm gear 22 rotates, the worm gear drives the D-shaped worm gear shaft 6 to rotate synchronously, and the D-shaped worm gear shaft 6 drives the connecting shaft 3 to rotate synchronously. The bottom of the D-shaped worm gear shaft 6 and the top of the connecting shaft 3 are integrally formed, and a locking screw 62 is installed on the top of the D-shaped worm gear shaft 6. A locking nut 63 is threaded onto the locking screw 62, and the reduction worm gear 22 abuts against the locking nut 63 and the connecting shaft 3. When replacing the reduction worm gear 22, first loosen the locking nut 63 to remove it from the locking screw 62, then remove the old reduction worm gear 22, then put the new reduction worm gear 22 onto the D-type worm gear shaft 6, and finally thread the locking nut 63 onto the locking screw 62 so that the locking nut 63 abuts against the reduction worm gear 22.

[0035] Reference Figures 2 to 5 A ring plate 71 is integrally formed at the top of the connecting shaft 3. A bearing shaft 7 is mounted on the top of the ring plate 71, and the top of the bearing shaft 7 is integrally formed with the bottom of the D-type worm gear shaft 6. A set of needle roller bearings 72 and a bearing pressure plate 73 are fitted on the bearing shaft 7. The needle roller bearings 72 abut against the ring plate 71 and the reduction worm gear 22, and the bearing pressure plate 73 abuts against the needle roller bearings 72. An upper threaded hole 81 is formed through the bearing pressure plate 73, and a lower threaded hole 82 is formed through the adjusting bracket 12. A connecting bolt 8 is arranged in the upper threaded hole 81 and the lower threaded hole 82. The connecting bolt 8 passes through the upper threaded hole 81 and is threadedly connected to the lower threaded hole 82. The bearing pressure plate 73 and the adjusting bracket 12 are detachably connected by the connecting bolt 8. When the reduction worm gear 22 is installed on the D-type worm gear shaft 6, the needle roller bearings 72 abut against the ring plate 71 and the reduction worm gear 22, and the needle roller bearings 72 reduce the axial friction of the reduction worm gear 22.

[0036] Reference Figures 2 to 6 A through hole 32 is formed in the adjusting bracket 12, and a deep groove ball bearing 31 is installed in the through hole 32. The inner ring of the deep groove ball bearing 31 abuts against the bottom of the ring plate 71. The deep groove ball bearing 31 is sleeved on the connecting shaft 3 and is interference-fitted with the connecting shaft 3. The deep groove ball bearing 31 reduces the frictional resistance when the connecting shaft 3 rotates.

[0037] Reference Figures 2 to 7 A damping square rod 41 is installed at the bottom of the connecting shaft 3, and a mechanical damper 4 is sleeved on the damping square rod 41. The side wall of the damping square rod 41 abuts against the mechanical damper 4. Several mounting plates 93 are installed on the side wall of the mechanical damper 4, and mounting holes 91 are opened through the mounting plates 93. Mounting bolts 9 are inserted into the mounting holes 91. Several mounting slots 92 are opened on the adjusting bracket 12, and the mounting bolts 9 are threaded to the mounting slots 92. The mechanical damper 4 and the adjusting bracket 12 are detachably connected by the mounting bolts 9. The mechanical damper 4 is connected to the connecting shaft 3 through the damping square rod 41. When the connecting shaft 3 rotates, it drives the damping square rod 41 to rotate. The damping square rod 41 causes the solid parts in contact with each other in the mechanical damper 4 to move relative to each other, generating frictional resistance.

[0038] The implementation principle of the EMC testing equipment for a loaded motor unaffected by external electromagnetic interference in this application embodiment is as follows: When performing EMC testing on the motor under test, the motor under test is mounted on the base 1, and the output shaft of the motor under test is connected to the input shaft of the coupling 2. The reduction worm gear 22 and the mechanical damper 4 are replaced according to the rated load torque and speed of the motor. When the motor under test is running, it drives the reduction worm gear 21 to rotate, which in turn drives the reduction worm gear 22 to rotate. The rotation of the reduction worm gear 22 drives the connecting shaft 3 to rotate. The mechanical damper 4 provides resistance to the operation of the motor under test, simulating the operating state of the motor under test under load, thereby detecting the motor compatibility performance of the motor under test under load. Since the mechanical damper 4 does not require power, it will not generate radiated interference that affects the accuracy of the EMC performance data of the motor under test, thus improving the accuracy of the motor EMC test.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A load-bearing motor EMC testing device unaffected by external electromagnetic interference, comprising a base, wherein a coupling is disposed on the base, characterized in that: A reduction worm gear is fixedly installed on the output shaft of the coupling. A mounting bracket is fixedly installed on one side of the base. The reduction worm gear is rotatably mounted on the mounting bracket. An adjustment bracket is installed at the bottom of the mounting bracket. A connecting shaft is rotatably mounted on the adjustment bracket. A mechanical damper and a reduction worm gear are detachably mounted on the connecting shaft. The mechanical damper is detachably connected to the adjustment bracket. The reduction worm gear and the reduction worm gear mesh with each other.

2. The EMC testing equipment for a loaded motor unaffected by external electromagnetic fields according to claim 1, characterized in that: The mounting bracket has an adjustment circular hole on one side facing the adjustment bracket. An adjustment screw is threaded into the adjustment circular hole. Several adjustment elongated holes are opened through the adjustment bracket. The adjustment screw passes through the adjustment elongated holes. An adjustment end is fixedly installed at one end of the adjustment screw outside the adjustment circular hole. The adjustment end is used to abut against the adjustment bracket.

3. The EMC test equipment for a load motor not affected by external electromagnetic according to claim 1, characterized in that: A D-shaped worm gear hole is formed through the reduction worm gear, and a D-shaped worm gear shaft is inserted into the D-shaped worm gear hole. The inner wall of the D-shaped worm gear hole and the outer wall of the D-shaped worm gear shaft fit together. The bottom of the D-shaped worm gear shaft is fixedly connected to the top of the connecting shaft. A locking screw is fixedly installed on the top of the D-shaped worm gear shaft, and a locking nut is threaded onto the locking screw. The bottom of the locking nut abuts against the top of the reduction worm gear, and the bottom of the reduction worm gear abuts against the top of the connecting shaft.

4. A EMC test equipment for electric machines with load, not affected by external electromagnetic influences, according to claim 3, characterized in that: A ring plate is fixedly installed at the top of the connecting shaft. The ring plate is fixedly connected to the connecting shaft. A bearing shaft is fixedly installed at the top of the ring plate. The top of the bearing shaft is fixedly connected to the bottom of the D-type worm gear shaft. A set of needle roller bearings and a bearing pressure plate are sleeved on the bearing shaft. The needle roller bearings abut against the ring plate and the reduction worm gear. The bearing pressure plate abuts against the needle roller bearings. The bearing pressure plate is detachably connected to the adjusting bracket.

5. A EMC test equipment for electric machines with load, not affected by external electromagnetic influences, according to claim 4, characterized in that: The bearing pressure plate has an upper threaded hole, and the adjusting bracket has a lower threaded hole. A connecting bolt is provided in both the upper and lower threaded holes. The connecting bolt passes through the upper threaded hole and is threadedly connected to the lower threaded hole.

6. A EMC test equipment for electric machines with load, not affected by external electromagnetic influences, according to claim 4, characterized in that: A through hole is formed in the adjusting bracket, and a deep groove ball bearing is installed in the through hole. The deep groove ball bearing is sleeved on the connecting shaft and is interference-fitted with the connecting shaft. The inner ring of the deep groove ball bearing abuts against the bottom of the ring plate.

7. The EMC testing equipment for a loaded motor unaffected by external electromagnetic fields according to claim 1, characterized in that: A damping square rod is fixedly installed at the bottom of the connecting shaft, and the mechanical damper is sleeved on the damping square rod, with the side wall of the damping square rod abutting against the mechanical damper.

8. The EMC testing equipment for a loaded motor unaffected by external electromagnetic fields according to claim 1, characterized in that: The mechanical damper has several mounting plates fixedly installed on its sidewall. Mounting holes are opened through the mounting plates, and mounting bolts are inserted into the mounting holes. Several mounting slots are opened on the adjusting bracket, and the mounting bolts are threadedly connected to the mounting slots.

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