Air purifier motor EMC (Electro Magnetic Compatibility) test board and auxiliary jig thereof

Abstract

The invention relates to the technical field of electromagnetic compatibility testing, in particular to an air purifier motor EMC (Electro Magnetic Compatibility) test board and an auxiliary jig thereof, and solves the problems that when an electromagnetic compatibility test is carried out on an air purifier motor, a worker needs to manually connect a motor output shaft with an input shaft of test equipment, and the work efficiency is high. And different parts need to be used for connection for motors of different models, and the operation preparation time is long. The invention discloses an air purifier motor EMC test bench and an auxiliary jig thereof, the air purifier motor EMC test bench comprises a test bench surface, a motor data detection assembly and a control terminal, four end corners of the test bench surface are fixedly provided with support frames, the middle position of the upper surface of the test bench surface is fixedly provided with a motor placing base plate, and a fixed plate is fixed among the top ends of the four support frames. Electromagnetic interference is applied to the running motor, and the ratio of the rotating speed of the motor to the rotating speed of the test coupler under different electromagnetic interference degrees is calculated, so that the electromagnetic compatibility strength of the motor is determined.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic compatibility testing, and in particular to an air purifier motor EMC test bench and an auxiliary fixture thereof. Background Art

[0002] Air purifiers, also known as "air cleaners", air fresheners, and purifiers, refer to products that can absorb, decompose or transform various air pollutants (generally including PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.), effectively improving air cleanliness. They are mainly divided into household, commercial, industrial, and building. The main core of air purification includes purification components and drive motors. Air purifier motors need to undergo EMC testing before use. The main purpose of EMC testing of motors is to ensure that they can operate normally in an electromagnetic environment and will not interfere with other equipment or systems. EMC testing, also known as electromagnetic compatibility (EMC) testing, refers to the comprehensive assessment of the electromagnetic interference (EMI) and anti-interference ability (EMS) of electronic products. It is one of the most important indicators of product quality. The electromagnetic compatibility measurement system consists of a test site and test instruments.

[0003] However, when performing electromagnetic compatibility testing on air purifier motors, workers are required to manually connect the motor output shaft to the input shaft of the test equipment. Different types of motors require different parts for connection, and the operation preparation takes a long time. Therefore, it does not meet the existing needs. In this regard, we propose an air purifier motor EMC test bench and its auxiliary fixture. Summary of the invention

[0004] The purpose of the present invention is to provide an air purifier motor EMC test bench and its auxiliary fixture to solve the problems raised in the above background technology that when performing electromagnetic compatibility testing on the air purifier motor, the staff needs to manually connect the motor output shaft with the input shaft of the test equipment, different parts need to be used for connection of different models of motors, and the operation preparation takes a long time.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air purifier motor EMC test bench, comprising a test table, a motor data detection component, and a control terminal, wherein support frames are fixed at the four end corners of the test table, a motor placement pad is fixed at the middle position of the upper surface of the test table, a fixing plate is fixed between the top ends of the four support frames, a coupling fixture is fixed at the middle of the top end of the fixing plate, a test coupling is rotatably installed at the bottom end of the coupling fixture, the test coupling passes through the fixing plate and the axis coincides with the axis of the motor placement pad, and a test component is also installed on the upper surface of the fixing plate; The motor data monitoring component includes a motor temperature sensor and a motor speed sensor, the motor temperature sensor and the motor speed sensor are directly connected to the motor, and the test component, the motor temperature sensor and the motor speed sensor are electrically connected to the control terminal.

[0006] Preferably, the test component includes an adjustable load, a coupling rotation test chip, a temperature test chip, a motor speed test chip and a main control chip, and the adjustable load, coupling rotation test chip, temperature test chip, motor speed test chip and main control chip are detachably mounted on the surface of a fixed plate, and the adjustable load, coupling rotation test chip, temperature test chip, motor speed test chip and main control chip are distributed in an equiangular circle around the axis of the test coupling, and transmission data lines are fixed between the adjustable load, coupling rotation test chip, temperature test chip, motor speed test chip and main control chip, and test data lines are fixed to the upper surfaces of the adjustable load and the coupling rotation test chip, and one end of the test data line is fixed to the coupling fixture.

[0007] An auxiliary fixture of an air purifier motor EMC test bench comprises a test fixture body, the upper surface of the test bench is also fixed with four symmetrically positioned fixing seats, the top of the fixing seats is provided with a strip groove, and the test fixture body is located between the four fixing seats.

[0008] Preferably, the test fixture body includes four symmetrically distributed positioning electric telescopic rods, and the four positioning electric telescopic rods are respectively fixedly connected in the strip grooves on the top of four fixed seats, and the movable ends of the positioning electric telescopic rods point to the axis of the motor placement pad, and the movable ends of the positioning electric telescopic rods are fixed with shielding shells.

[0009] Preferably, the four shielding shells are all arc-shaped, and reserved holes are formed between the top and bottom ends of the four shielding shells after the sides thereof contact each other.

[0010] Preferably, a rubber sheet is bonded to the inner side of the shielding shell, and an electromagnetic interference harness is provided on the surface of the rubber sheet.

[0011] Preferably, the top and bottom of the shielding shell are penetrated by harness through holes, the electromagnetic interference harness is distributed in a serpentine shape on the surface of the rubber plate, and the two ends of the electromagnetic interference harness pass through the two harness through holes to be connected to the power supply.

[0012] Preferably, both ends of the shielding shell are bent 90 degrees toward the axis direction of the motor placement pad, and motor positioning parts are fixed on the inner sides of the top and bottom ends of the shielding shell, and the two motor positioning parts connected to the same shielding shell are symmetrically positioned up and down.

[0013] Preferably, the motor positioning member includes a fixing plate, which is fixed to the shielding shell and the upper surface of the fixing plate is flush with the upper surface of the motor placement pad, a guide plate is fixed to the upper surface of the fixing plate, a supporting plate is fixed to the top of the guide plate, and a limiting plate is fixed to the upper surface of the supporting plate.

[0014] Preferably, the support piece is kept parallel to the adjustable load, and the guide piece has an inclination angle of forty-five degrees, and the connection between the bottom end of the guide piece and the adjustable load is an arc surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention applies electromagnetic interference to a running motor, calculates the rotational speed of the motor and the rotational speed ratio of the test coupling under different electromagnetic interference levels, thereby determining the electromagnetic compatibility strength of the motor, and simultaneously records the temperature changes during the motor test to determine the influence of temperature on the electromagnetic compatibility of the motor.

[0016] 2. The present invention positions and clamps the motor by placing four shielding shells close to each other and utilizing the motor positioning members on the inner side of the shielding shells. During the positioning and clamping, the axis of the motor is ensured to coincide with the axis of the test coupling, and the motor and the test coupling are docked during the positioning and clamping process, thereby shortening the motor installation operation time during the test and improving the operating efficiency of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the test table of the present invention; Figure 3 It is a structural schematic diagram of the test assembly of the present invention; Figure 4 It is a structural schematic diagram of the main body of the test fixture of the present invention; Figure 5 It is a schematic diagram of the structure of the electromagnetic interference harness of the present invention; Figure 6 It is a structural schematic diagram of the motor positioning member of the present invention; Figure 7 It is a schematic structural diagram of the shielding shell of the present invention.

[0018] In the figure: 1. Test table; 2. Support frame; 3. Fixing plate; 4. Test fixture body; 41. Positioning electric telescopic rod; 42. Shielding shell; 43. Electromagnetic interference harness; 44. Reserved hole; 45. Rubber plate; 46. Motor positioning piece; 461. Fixing plate; 462. Guide plate; 463. Support plate; 464. Limiting plate; 47. Harness perforation; 5. Coupling holder; 6. Test assembly; 61. Adjustable load; 62. Coupling rotation test chip; 63. Temperature test chip; 64. Motor speed test chip; 65. Main control chip; 66. Transmission data line; 67. Test data line; 68.; 7. Fixing seat; 8. Motor placement pad; 9. Test coupling. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] like Figures 1 to 3 As shown, an air purifier motor EMC test bench includes a test table 1, a motor data detection component, and a control terminal. Support frames 2 are fixed at the four end corners of the test table 1, a motor placement pad 8 is fixed at the middle position of the upper surface of the test table 1, a fixing plate 3 is fixed between the top ends of the four support frames 2, a coupling fixture 5 is fixed in the middle of the top end of the fixing plate 3, a test coupling 9 is rotatably installed at the bottom end of the coupling fixture 5, the test coupling 9 passes through the fixing plate 3 and its axis coincides with the axis of the motor placement pad 8, and a test component 6 is also installed on the upper surface of the fixing plate 3.

[0021] The motor data monitoring component includes a motor temperature sensor and a motor speed sensor, the motor temperature sensor and the motor speed sensor are directly connected to the motor, and the test component 6, the motor temperature sensor and the motor speed sensor are electrically connected to the control terminal.

[0022] The test assembly 6 includes an adjustable load 61, a coupling rotation test chip 62, a temperature test chip 63, a motor speed test chip 64 and a main control chip 65. The adjustable load 61, the coupling rotation test chip 62, the temperature test chip 63, the motor speed test chip 64 and the main control chip 65 are detachably mounted on the surface of the fixed plate 3, and the adjustable load 61, the coupling rotation test chip 62, the temperature test chip 63, the motor speed test chip 64 and the main control chip 65 are distributed in an equiangular circle around the axis of the test coupling 9. The chip 63, the motor speed test chip 64 and the main control chip 65 are fixed with a transmission data line 66. The upper surface of the adjustable load 61 and the coupling test chip 62 is fixed with a test data line 67. One end of the test data line 67 is fixed to the coupling fixture 5. The motor speed and temperature are monitored by the motor data monitoring component. The speed of the test coupling 9 is detected by using the coupling test chip 62. The speed ratio of the motor speed and the test coupling 9 is calculated to determine the working efficiency of the motor under the current electromagnetic intensity. The electromagnetic compatibility of the motor is determined by comparing the motor efficiency under interference of different electromagnetic intensities.

[0023] like Figure 1 , Figures 4 to 7 As shown, an auxiliary fixture of an air purifier motor EMC test bench includes a test fixture body 4. Four symmetrically positioned fixing seats 7 are also fixed on the upper surface of the test table 1. A strip groove is provided on the top of the fixing seat 7. The test fixture body 4 is located between the four fixing seats 7. The test fixture body 4 includes four symmetrically distributed positioning electric telescopic rods 41. The four positioning electric telescopic rods 41 are respectively fixedly connected in the strip grooves on the tops of the four fixing seats 7. The movable end of the positioning electric telescopic rod 41 points to the axis of the motor placement pad 8, and a shielding shell 42 is fixed to the movable end of the positioning electric telescopic rod 41. The positioning electric telescopic rod 41 is used to push the shielding shell 42 to move, so that the four shielding shells 42 are closed to each other and wrap the motor being tested, so as to shield external electromagnetic interference and ensure the accuracy of the test results.

[0024] The four shielding shells 42 are all arc-shaped, and after the sides of the four shielding shells 42 contact each other, reserved holes 44 are formed between the top and bottom ends. The existence of the reserved holes 44 prevents the four shielding shells 42 from contacting the motor after closing, thereby ensuring that the operation of the motor will not be disturbed.

[0025] A rubber sheet 45 is bonded to the inner side of the shielding shell 42, and an electromagnetic interference harness 43 is provided on the surface of the rubber sheet 45. Harness through-holes 47 are provided on the top and bottom of the shielding shell 42. The electromagnetic interference harness 43 is distributed in a serpentine shape on the surface of the rubber sheet 45, and the two ends of the electromagnetic interference harness 43 pass through two harness through-holes 47 to be connected to a power supply. The electromagnetic interference harness 43 distributed in a serpentine shape on the inner side of the shielding shell 42 is used to perform electromagnetic interference on the running motor, thereby testing the electromagnetic compatibility strength of the motor.

[0026] Both ends of the shielding shell 42 are bent ninety degrees toward the axis direction of the motor placement pad 8. Motor positioning members 46 are fixed to the inner sides of the top and bottom ends of the shielding shell 42. The two motor positioning members 46 connected to the same shielding shell 42 are symmetrical in position up and down. The motor positioning member 46 includes a fixing plate 461, which is fixed to the shielding shell 42 and the upper surface of the fixing plate 461 is flush with the upper surface of the motor placement pad 8. A guide plate 462 is fixed to the upper surface of the fixing plate 461, a support plate 463 is fixed to the top of the guide plate 462, and a limit plate 464 is fixed to the upper surface of the support plate 463. The support plate 463 is kept flush with the adjustable load 61. The guide piece 462 is tilted at an angle of forty-five degrees, and the connection between the bottom end of the guide piece 462 and the adjustable load 61 is an arc surface. When the shielding shell 42 moves toward the direction of the motor placement pad 8, the bottom end of the guide piece 462 contacts the bottom of the motor. At this time, the guide piece 462 pushes the motor upward. During the pushing process, the axis of the motor gradually coincides with the axis of the motor placement pad 8 and the test coupling 9, and the motor keeps rising slowly until the support piece 463 reaches the bottom of the motor and the four limit pieces 464 contact the side of the motor. At this time, the output shaft of the motor is inserted into the bottom end of the test coupling 9 and connected to the test coupling 9, thereby realizing the rapid positioning and installation connection of the motor.

[0027] Working principle: First, the staff places the motor to be tested for electromagnetic compatibility on the surface of the motor placement pad 8, then turns on the power of the device and starts it. After the device is started, the four positioning electric telescopic rods 41 are started at the same time and push the shielding shell 42, so that the four shielding shells 42 are simultaneously close to the motor placement pad 8. When the shielding shell 42 is close to the motor placement pad 8, the motor positioning members 46 at the top and bottom of the shielding shell 42 will contact the motor before the shielding shell 42, and the guide piece 462 at the bottom of the shielding shell 42 will contact the bottom edge of the motor. The guide piece 462 in contact with the motor squeezes the motor, so that the motor moves on the surface of the motor placement pad 8; Until the four guide pieces 462 at the bottom ends of the four shielding shells 42 are in contact with the motor, at this time the four guide pieces 462 squeeze the motor and make the motor move upward along the axis of the motor placement pad 8, the axis of the moving motor coincides with the axis of the motor placement pad 8 and the test coupling 9, the motor moves upward until the bottom surface of the motor contacts the upper surface of the support piece 463, at this time the top of the motor shell contacts the four support pieces 463 at the top end of the shielding shell 42, at the same time the output shaft of the motor is plugged into the bottom end of the test coupling 9 and connected to the test coupling 9, pushing the four shielding shells 42 until the sides of the four shielding shells 42 contact each other, the eight motor positioning members 46 fix the position of the motor from the top and bottom of the motor, realize the rapid positioning and installation connection of the motor, shorten the installation operation time of the motor during the electromagnetic compatibility test, and improve the work efficiency of the staff; The motor is fixed with a motor temperature sensor and a motor speed sensor connected to the motor, and the device power is turned on. After the power is turned on, the motor is powered on and started. After the motor is powered on and started, the test coupling 9 is driven to rotate. At this time, the coupling test chip 62 monitors the real-time speed of the test coupling 9. At the same time, the motor temperature sensor and the motor speed sensor record the temperature and speed of the motor at this time, and transmit the records to the temperature test chip 63 and the motor speed test chip 64 respectively. After receiving the data, the coupling test chip 62, the temperature test chip 63, and the motor speed test chip 64 transmit the data to the main control chip 65. The main control chip 65 compares and analyzes the finally received data to determine the motor At this time, the power is input into the electromagnetic interference harness 43 with currents of different current ratings during the operation of the motor. After the electromagnetic interference harness 43 is energized, it emits electromagnetic interference to the running motor. After being subjected to the electromagnetic interference of the electromagnetic interference harness 43, the speed and temperature of the motor change. The motor temperature sensor and the motor speed sensor record the changing data and transmit them to the temperature test chip 63 and the motor speed test chip 64. At the same time, the speed of the test coupling 9 changes with the output speed of the motor. By determining the speed ratio between the motor and the test coupling 9 at this time, the electromagnetic compatibility of the motor at this time is determined, and the electromagnetic compatibility strength of the motor is determined by the speed ratio between the motor and the test coupling 9 under different electromagnetic intensities.

[0028] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An air purifier motor EMC test bench, comprising a test bench (1), a motor data detection component, and a control terminal, characterized in that: Support frames (2) are fixed at the four end corners of the test table (1); a motor placement pad (8) is fixed at the middle position of the upper surface of the test table (1); a fixing plate (3) is fixed between the top ends of the four support frames (2); a coupling fixture (5) is fixed in the middle of the top end of the fixing plate (3); a test coupling (9) is rotatably mounted at the bottom end of the coupling fixture (5); the test coupling (9) passes through the fixing plate (3) and its axis coincides with the axis of the motor placement pad (8); a test assembly (6) is also mounted on the upper surface of the fixing plate (3); The motor data monitoring component comprises a motor temperature sensor and a motor speed sensor, wherein the motor temperature sensor and the motor speed sensor are directly connected to the motor, and the test component (6), the motor temperature sensor and the motor speed sensor are electrically connected to the control terminal.

2. The air purifier motor EMC test bench according to claim 1, characterized in that: The test assembly (6) comprises an adjustable load (61), a coupling rotation test chip (62), a temperature test chip (63), a motor speed test chip (64) and a main control chip (65); the adjustable load (61), the coupling rotation test chip (62), the temperature test chip (63), the motor speed test chip (64) and the main control chip (65) are detachably mounted on the surface of the fixed plate (3); and the adjustable load (61), the coupling rotation test chip (62), the temperature test chip (63), the motor speed test chip (64) and the main control chip (65) are detachably mounted on the surface of the fixed plate (3). The test chip (64) and the main control chip (65) are distributed in an equiangular circle around the axis of the test coupling (9); transmission data lines (66) are fixed between the adjustable load (61), the coupling test chip (62), the temperature test chip (63), the motor speed test chip (64) and the main control chip (65); test data lines (67) are fixed on the upper surfaces of the adjustable load (61) and the coupling test chip (62); one end of the test data line (67) is fixed to the coupling fixture (5).

3. The auxiliary fixture of the air purifier motor EMC test bench according to claim 1, comprising a test fixture body (4), characterized in that: Four symmetrically positioned fixing seats (7) are also fixed to the upper surface of the test table (1), a strip-shaped groove is provided on the top of the fixing seat (7), and the test fixture body (4) is located between the four fixing seats (7).

4. The auxiliary fixture of the air purifier motor EMC test bench according to claim 3 is characterized by: The test fixture body (4) comprises four symmetrically distributed positioning electric telescopic rods (41), the four positioning electric telescopic rods (41) being fixedly clamped in the strip grooves at the tops of four fixing seats (7), respectively, the movable ends of the positioning electric telescopic rods (41) pointing to the axis of the motor placement pad (8), and the movable ends of the positioning electric telescopic rods (41) being fixed with shielding shells (42).

5. The auxiliary fixture of the air purifier motor EMC test bench according to claim 4, characterized in that: The four shielding shells (42) are all arc-shaped, and after the sides of the four shielding shells (42) contact each other, a reserved hole (44) is formed between the top and bottom ends.

6. The auxiliary fixture of the air purifier motor EMC test bench according to claim 5, characterized in that: A rubber sheet (45) is bonded to the inner side of the shielding shell (42), and an electromagnetic interference harness (43) is provided on the surface of the rubber sheet (45).

7. The auxiliary fixture of the air purifier motor EMC test bench according to claim 6, characterized in that: The top and bottom of the shielding shell (42) are both penetrated by wire harness through holes (47), the electromagnetic interference wire harness (43) is distributed in a serpentine shape on the surface of the rubber plate (45), and the two ends of the electromagnetic interference wire harness (43) pass through the two wire harness through holes (47) to be connected to a power source.

8. The auxiliary fixture of the air purifier motor EMC test bench according to claim 7, characterized in that: Both ends of the shielding shell (42) are bent at ninety degrees toward the axis direction of the motor placement pad (8), and motor positioning members (46) are fixed to the inner sides of the top and bottom ends of the shielding shell (42), and the two motor positioning members (46) connected to the same shielding shell (42) are symmetrically positioned up and down.

9. The auxiliary fixture of the air purifier motor EMC test bench according to claim 8, characterized in that: The motor positioning member (46) comprises a fixing plate (461), wherein the fixing plate (461) is fixed to the shielding shell (42) and the upper surface of the fixing plate (461) is flush with the upper surface of the motor placement pad (8), a guide plate (462) is fixed to the upper surface of the fixing plate (461), a support plate (463) is fixed to the top end of the guide plate (462), and a limiting plate (464) is fixed to the upper surface of the support plate (463).

10. The auxiliary fixture of the air purifier motor EMC test bench according to claim 9, characterized in that: The support piece (463) is kept parallel to the adjustable load (61), and the guide piece (462) is inclined at an angle of forty-five degrees, and the connection between the bottom end of the guide piece (462) and the adjustable load (61) is an arc surface.

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