A back emf checking device
By designing a back EMF checking device, the automatic detection of rotor magnetization parameters was realized, solving the problems of low efficiency and low accuracy of existing detection methods. It achieved high-precision and fast back EMF measurement, which is suitable for industrial applications in complex electromagnetic environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI VELLE AUTOMOBILE AIR CONDITIONER CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-14
AI Technical Summary
Existing rotor magnetization detection methods are inefficient, prone to large human error, and produce inaccurate results. Back EMF measurement devices are not precise, have slow response speeds, and poor anti-interference capabilities, making them unable to effectively cope with complex electromagnetic environments and highly dynamic changes.
A back EMF testing device was designed, including a worktable, a rotating shaft drive device, and a motor energizing device. Through automated feeding, detection, and discharging, combined with a rotary drive motor, a lifting cylinder, and a cylinder-driven displacement device, the device achieves automated detection of the motor and measures the PK-PK value of the motor's back EMF.
It achieves high-precision and rapid back EMF measurement, improves the stability and reliability of detection, and can work stably in complex electromagnetic environments to meet the needs of industrial applications.
Smart Images
Figure CN224500861U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automated detection, specifically a back EMF checking device. Background Technology
[0002] Currently, rotor magnetization mainly relies on automatic magnetizers. However, factors such as magnetization angle errors lead to variations in magnetization parameters, necessitating manual sampling and identification using a teslameter. Existing detection methods are inefficient, and human error contributes to inaccurate results. Furthermore, current back EMF measurement devices on the market generally suffer from low accuracy, slow response speed, and poor anti-interference capabilities. These problems primarily stem from the inability of existing measurement technologies and equipment to effectively handle complex electromagnetic environments and highly dynamic changes. This patent aims to address these issues by providing a high-precision, fast-speed back EMF measurement device with strong anti-interference capabilities. Summary of the Invention
[0003] To address the above problems, this invention provides a back potential detection device.
[0004] The technical solution of this utility model is: a back EMF testing device, including a worktable, a shaft drive device, and a motor energizing device. The worktable is located above the conveying mechanism of the motor under test. A window is provided on the worktable, and a lifting shaft seat is provided on the rear side of the worktable. The shaft drive device includes a rotary drive motor mounted on the lifting shaft seat. The output end of the rotary drive motor is connected to the main shaft of the motor under test to drive the main shaft to rotate. The motor energizing device is located on the side of the worktable to energize the motor under test.
[0005] Preferably, the output end of the rotary drive motor is provided with a rotating shaft sleeve, which is located above the window.
[0006] As a further preferred embodiment, the inside of the rotating shaft sleeve is provided with a spindle hole to accommodate the spindle of the motor under test, and an eccentric hole is provided at the upper bottom of the spindle hole, the position of which corresponds to the position of the eccentric pin at the upper end of the spindle of the motor under test.
[0007] As a further preferred embodiment, the output end of the rotary drive motor is provided with a coupling, the lower end of the coupling is provided with a spring shaft, the outside of the spring shaft is provided with a spring, the rotating shaft sleeve is sleeved on the outside of the lower end of the spring shaft, and the upper end of the spring abuts against the coupling, the lower end abuts against the upper end of the rotating shaft sleeve, driving the rotating shaft sleeve to stay in the downward abutment position.
[0008] Preferably, the lifting pivot seat includes a lifting base and a pivot seat. The lifting base is fixedly connected to a column located at the rear end of the worktable. The pivot seat is located at the front end of the lifting base, and a slider is provided on the back of the pivot seat. A slide rail is provided on the front side of the lifting base, and the slider is located on the slide rail. The pivot seat is driven to move up and down along the slide rail by a lifting base cylinder located at the front end of the lifting base.
[0009] Preferably, the motor energizing device includes a motor energizing plug and a displacement driving device that drives the motor energizing plug to approach or move away from the motor under test.
[0010] As a further preferred embodiment, the displacement driving device includes a first translation cylinder and a first lifting cylinder. The cylinder body of the first lifting cylinder is fixed to the right side of the worktable. The output end of the first lifting cylinder is oriented downwards, and the output end of the first lifting cylinder is provided with a translation seat. The cylinder body of the first translation cylinder is fixed to the lower surface of the translation seat. The output end of the first translation cylinder faces the center of the worktable, and the motor power plug is fixed to the output end of the first translation cylinder.
[0011] Preferably, the motor under test conveying mechanism is provided with a motor under test fixing fixture.
[0012] The beneficial effects of this invention are as follows: This invention has a simple and reliable structure, realizing an automated detection method for automatic feeding, inspection, and discharging. It not only significantly improves the accuracy and stability of the measurement but also substantially enhances the system's detection speed and reliability. Attached Figure Description
[0013] Figure 1 This is the front view of the present invention.
[0014] Figure 2 This is the right view of the present invention.
[0015] Figure 3 This diagram shows the structural relationship between the rotating shaft sleeve and the eccentric pin of the motor under test in the retracted state of the lifting base cylinder of this utility model.
[0016] Figure 4 This is one of the three-dimensional views of the motor to be tested according to this utility model.
[0017] Figure 5 This diagram shows the structural relationship between the rotating shaft sleeve and the eccentric pin of the motor under test in the extended state of the lifting base cylinder of this utility model.
[0018] Figure 6 This is a schematic diagram of the socket position of the motor to be tested according to this utility model.
[0019] Label Explanation
[0020] 1: Motor under test conveying mechanism; 2: Motor under test; 3: Worktable; 4: Eccentric hole; 5: Rotary shaft sleeve; 6: Rotary shaft seat; 7: Lifting base cylinder; 8: Rotary drive motor; 9: Coupling; 10: Spring shaft; 11: First lifting cylinder; 12: Translation seat; 13: First translation cylinder; 14: Motor power plug; 15: Motor under test fixing fixture; 16: Column; 17: Slider; 18: Lifting base; 19: Slide rail; 21: Main shaft; 22: Eccentric pin; 23: Socket position. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] like Figure 1-4 As shown, a back EMF testing device includes a worktable 3, a shaft drive device, and a motor energizing device. The worktable 3 is located above the motor conveying mechanism 1 under test. A window is provided on the worktable 3. A lifting shaft seat is provided on the rear side of the worktable 3. The shaft drive device includes a rotary drive motor 8 located on the lifting shaft seat. The output end of the rotary drive motor 8 is connected to the main shaft 21 of the motor under test 2, driving the main shaft 21 to rotate. The motor energizing device is located on the side of the worktable 3 to energize the motor under test 2.
[0023] In this embodiment, the output end of the rotary drive motor 8 is provided with a rotating shaft sleeve 5, which is located above the window.
[0024] In this embodiment, the inside of the rotating shaft sleeve 5 is provided with a spindle hole to accommodate the spindle 21 of the motor under test 2. An eccentric hole 4 is provided at the upper bottom of the spindle hole. The position of the eccentric hole 4 corresponds to the position of the eccentric pin 22 at the upper end of the spindle 21 of the motor under test 2. The position of the eccentric pin 22 is as follows: Figure 4 As shown.
[0025] In this embodiment, the output end of the rotary drive motor 8 is provided with a coupling 9, the lower end of the coupling 9 is provided with a spring shaft 10, the outside of the spring shaft 10 is provided with a spring, the rotating shaft sleeve 5 is sleeved on the outside of the lower end of the spring shaft 10, and the upper end of the spring abuts against the coupling 9, and the lower end abuts against the upper end of the rotating shaft sleeve 5, driving the rotating shaft sleeve 5 to stay in the downward abutment position.
[0026] In this embodiment, the lifting pivot seat includes a lifting base 18 and a pivot seat 6. The lifting base 18 is fixedly connected to the column 16 located at the rear end of the worktable 3. The pivot seat 6 is located at the front end of the lifting base 18, and a slider 17 is provided on the back of the pivot seat 6. A slide rail 19 is provided on the front side of the lifting base 18, and the slider 17 is located on the slide rail 19. The pivot seat 6 is driven to move up and down along the slide rail 19 by the lifting base cylinder 7 located at the front end of the lifting base 18.
[0027] In this embodiment, the motor power supply device includes a motor power supply plug 14 and a displacement drive device that drives the motor power supply plug 14 to approach or move away from the motor 2 under test.
[0028] In this embodiment, the displacement driving device includes a first translation cylinder 13 and a first lifting cylinder 11. The cylinder body of the first lifting cylinder 11 is fixed to the right side of the workbench 3. The output end of the first lifting cylinder 11 is set downward, and the output end of the first lifting cylinder 11 is provided with a translation seat 12. The cylinder body of the first translation cylinder 13 is fixed to the lower surface of the translation seat 12. The output end of the first translation cylinder 13 faces the center of the workbench 3. The motor power plug 14 is fixed to the output end of the first translation cylinder 13.
[0029] In this embodiment, the motor under test conveying mechanism 1 is provided with a motor under test fixing fixture 15. Preferably, the motor under test conveying mechanism 1 is provided with a lifting mechanism that can drive the motor under test fixing fixture 15 to rise and fall. The lifting mechanism can use a hydraulic lifting cylinder to drive the motor under test fixing fixture 15 to rise and fall. The motor under test conveying mechanism 1 can be a conveying mechanism in the form of a conveying chain, a conveying guide rail, etc. The conveying mechanism and the lifting mechanism are both existing technologies and are not within the scope of protection of this application.
[0030] Working principle: This invention is used to test the back EMF of a motor 2 under test. When the motor is running, the conductor cuts the magnetic field lines, generating an electromotive force (EMF) in the opposite direction to the applied voltage. The magnitude of the back EMF is proportional to the rotational speed and magnetic flux, and its peak value (PK-PK value) reflects the amplitude of the back EMF at a specific rotational speed. This device can work stably in complex electromagnetic environments and meet the needs of various industrial applications.
[0031] In this embodiment, the motor under test 2 is fixed in the motor under test fixing fixture 15 on the motor under test conveying mechanism 1 to maintain the stable position of the motor under test 2. When the motor under test 2 is conveyed to the window directly below the workbench 3, the conveying stops, the lifting base cylinder 7 extends, the rotating shaft seat 6 descends, the rotating shaft sleeve 5 is fitted onto the main shaft 21 of the motor under test 2, and the eccentric pin 22 falls into the eccentric hole 4 of the rotating shaft sleeve 5. If the height is insufficient, the lifting mechanism can raise the motor under test 2 so that the rotating shaft sleeve 5 can connect with the eccentric pin 22. If the height is sufficient, the lifting mechanism is not needed, and the specific arrangement depends on the actual production situation. The first lifting cylinder 11 extends, the drive motor power plug 14 descends, the first translation cylinder 13 extends, and the drive motor power plug 14 is inserted into the socket position 23 of the motor under test 2. Figure 6As shown. The rotary drive motor 8 rotates, driving the shaft sleeve 5 to rotate the main shaft 21 of the motor under test 2. With the assistance of a spring, the eccentric hole 4 of the shaft sleeve 5 is aligned with the eccentric pin 22 of the motor under test 2, and the equipment begins to operate normally at the set speed for testing. The rotary drive motor 8 rotates at low speed to generate torque. When the eccentric pin 22 rotates, it drives the entire rotor to rotate, forming a magnetic field area. The three-phase coils cut the magnetic lines of force to generate alternating current, thereby measuring the PK-PK value of each phase. The difference between the maximum and minimum values of the induced electromotive force in the three-phase coils, i.e., the peak voltage, PK-PK is the peak voltage, calculated by measuring the AC voltage signal across the motor coils and determining the difference between its maximum and minimum values.
[0032] The three pins at the output terminal of the three-phase coil on the socket 23 of the motor under test are connected at one end to the three-phase coil inside the motor and at the other end to the motor power plug 14. When the motor power plug 14 is plugged into the socket 23 of the motor under test, voltage is applied to the motor, and the motor under test 2 rotates under the drive of the rotary drive motor 8, generating back electromotive force. AC voltage signal data is acquired from the three pins at the output terminal of the three-phase coil using a sensor with test voltage. This data is converted into a digital signal by a digital-to-analog converter, and then processed to obtain the peak voltage PK-PK value. Obtaining the PK-PK value from the AC voltage signal value is a standard data processing procedure in the industry and will not be elaborated here. The PK-PK value range is determined based on the motor's design parameters, specifying the nominal PK-PK value range at a specific speed. If the measured value falls within this range, it indicates that the motor is successfully magnetized.
[0033] In the description of this utility model, it should be understood that the terms "upper end", "lower end", "above", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] In this utility model, unless otherwise explicitly specified and limited, the term "connection" and other such terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A back EMF detection device, characterized in that... The device includes a worktable (3), a shaft drive device, and a motor power supply device. The worktable (3) is located above the motor conveying mechanism (1) under test. A window is provided on the worktable (3). A lifting shaft seat is provided on the rear side of the worktable (3). The shaft drive device includes a rotary drive motor (8) located on the lifting shaft seat. The output end of the rotary drive motor (8) is connected to the main shaft (21) of the motor under test (2) to drive the main shaft (21) to rotate. The motor power supply device is located on the side of the worktable (3) to power the motor under test (2).
2. The back potential detection device according to claim 1, characterized in that... The output end of the rotary drive motor (8) is provided with a rotating shaft sleeve (5), which is located above the window.
3. The back potential detection device according to claim 2, characterized in that... The inside of the rotating shaft sleeve (5) is provided with a spindle hole for accommodating the spindle (21) of the motor under test (2). An eccentric hole (4) is provided at the bottom of the spindle hole. The position of the eccentric hole (4) corresponds to the position of the eccentric pin (22) at the upper end of the spindle (21) of the motor under test (2).
4. The back potential detection device according to claim 2, characterized in that... The output end of the rotary drive motor (8) is provided with a coupling (9), and the lower end of the coupling (9) is provided with a spring shaft (10). A spring is provided on the outside of the spring shaft (10). The rotating shaft sleeve (5) is sleeved on the outside of the lower end of the spring shaft (10), and the upper end of the spring abuts against the coupling (9), and the lower end abuts against the upper end of the rotating shaft sleeve (5), driving the rotating shaft sleeve (5) to stay in the downward abutment position.
5. A back potential detection device according to any one of claims 1-4, characterized in that... The lifting pivot seat includes a lifting base (18) and a pivot seat (6). The lifting base (18) is fixedly connected to the column (16) located at the rear end of the worktable (3). The pivot seat (6) is located at the front end of the lifting base (18), and a slider (17) is provided on the back of the pivot seat (6). A slide rail (19) is provided on the front side of the lifting base (18), and the slider (17) is located on the slide rail (19). The pivot seat (6) is driven to move up and down along the slide rail (19) by the lifting base cylinder (7) located at the front end of the lifting base (18).
6. The back potential detection device according to claim 1, characterized in that... The motor power supply device includes a motor power supply plug (14) and a displacement drive device that drives the motor power supply plug (14) to approach or move away from the motor under test (2).
7. A back potential detection device according to claim 5, characterized in that... The displacement driving device includes a first translation cylinder (13) and a first lifting cylinder (11). The cylinder body of the first lifting cylinder (11) is fixed to the right side of the workbench (3). The output end of the first lifting cylinder (11) is set downward, and the output end of the first lifting cylinder (11) is provided with a translation seat (12). The cylinder body of the first translation cylinder (13) is fixed to the lower surface of the translation seat (12). The output end of the first translation cylinder (13) faces the center of the workbench (3). The motor power plug (14) is fixed to the output end of the first translation cylinder (13).
8. The back potential detection device according to claim 1, characterized in that... The motor under test conveying mechanism (1) is provided with a motor under test fixing fixture (15).