Counter electromotive force detection device and method of motor

Abstract

The invention relates to the technical field of motor back electromotive force measuring equipment, and discloses motor back electromotive force detection equipment which comprises a rack, and a contrast motor assembly and a to-be-detected motor assembly are oppositely arranged on the rack. A clamping transmission assembly used for being connected with the contrast motor assembly and the motor assembly to be measured in a clamping mode is arranged between the contrast motor assembly and the motor assembly to be measured, and the clamping transmission assembly is connected with a load mechanism used for providing loads through belt transmission. The detection instrument module automatically controls the load adjusting mechanism to change the pressure on the load mechanism, the mature pressure tester monitors the pressure, the motor load during measurement can be accurately changed, automatic measurement is achieved through the detection instrument module, the tedious degree of manual operation is greatly reduced, and the working efficiency is improved. Through comparison of multiple groups of detection data, more accurate back electromotive force data of the to-be-detected motor can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of motor back electromotive force measurement equipment, and in particular to a motor back electromotive force detection device and method. Background Art

[0002] The detection of motor back EMF is an important part of motor performance testing and control. It helps to understand the operation of the motor and the performance parameters of the motor. The commonly used methods for detecting motor back EMF are direct method, indirect method and comparison method. The direct method is accurate and simple to operate, but the high-precision instrument required is expensive. The principle of the indirect method is mainly to calculate the size of the motor back EMF through the relationship between the motor torque and the motor speed. Therefore, its measurement accuracy is low and it is greatly affected by environmental factors and the operating status of the motor during measurement. The comparison method is to put a motor with a known back EMF and the motor under test under the same load, and then measure the input current of the two motors. The ratio of the input current of the two motors is equal to the ratio of the back EMF of the two motors.

[0003] When the comparison method is used to measure the back electromotive force of a motor, in order to obtain accurate measurement data, it is usually necessary to change a variable to perform multiple sets of measurements, thereby obtaining multiple sets of data, and selecting stable data for analysis to reduce measurement errors. The existing equipment is cumbersome to operate when performing this process, and it is difficult for operators to control various variables during manual operation, which usually wastes a long time. Therefore, it is necessary to invent a motor back electromotive force detection device that can quickly measure multiple sets of comparison data. Summary of the invention

[0004] The purpose of the present invention is to provide a motor back electromotive force detection device and method in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: a motor back electromotive force detection device, including a frame, on which a reference motor assembly and a motor assembly to be tested are relatively arranged, a locking transmission assembly for locking and connecting the reference motor assembly and the motor assembly to be tested is arranged between the reference motor assembly and the motor assembly to be tested, the locking transmission assembly is connected to a load mechanism for providing a load through a belt drive, and also includes a load adjustment mechanism, which cooperates with the load mechanism and applies pressure to the load mechanism by clamping and squeezing to change the motor load; a bidirectional screw rod assembly, which cooperates with the load adjustment mechanism and has a servo motor at one end, and the servo motor is used to adjust the pressure applied by the load adjustment mechanism to the load mechanism; a detection instrument module, whose control is integrated and arranged on one side of the frame, and which is used to detect the pressure applied by the load adjustment mechanism to the load mechanism, the motor speed and the motor input current.

[0006] Further: the locking transmission assembly includes a locking support seat fixed on the frame, an axial hole is opened at the center position of the locking support seat, and mounting flanges are respectively provided at the front and rear ends, a transmission bearing is mounted on the rear end flange of the locking support seat, and a synchronous sleeve is matched with the outer side of the transmission bearing, and synchronous teeth are provided on the outer wall of the synchronous sleeve, an auxiliary bearing is mounted on the front end flange of the locking support seat, and a connecting shaft is matched with one end of the synchronous sleeve on the inner side of the auxiliary bearing, a locking fixing plate is fixed in the connecting shaft, and the two ends of the locking fixing plate are respectively fixedly connected with a reference motor locking seat and a motor to be tested locking seat for keying the reference and tested end motors.

[0007] Further: the load mechanism includes a rotating support seat, in which a main shaft is rotatably matched, a synchronous wheel for synchronous transmission is fixed on the main shaft, and the synchronous wheel is connected to the synchronous sleeve through a synchronous belt, a turntable is fixed on the output end of the main shaft, and the turntable and the load adjustment mechanism are a matching mechanism.

[0008] Further: the load adjustment mechanism includes two opposing extrusion plates for clamping the turntable, and the two opposing extrusion plates are slidably matched with a guide support rod for supporting the load adjustment mechanism, and a sliding pressure plate for pushing the opposing extrusion plates is slidably matched on the outer side of the opposing extrusion plates and the outer wall of the guide support rod, and a pressure tester for measuring the pushing pressure is provided between the sliding pressure plate and the opposing extrusion plate, and a sliding connecting plate for pushing the sliding pressure plate is slidably matched on the outer side of the sliding pressure plate and the outer wall of the guide support rod, and the sliding connecting plate and the bidirectional screw rod assembly are a matching mechanism, a plurality of compression springs are provided between the sliding connecting plate and the sliding pressure plate, and an adjusting nut is provided at the end of the sliding connecting plate away from the sliding pressure plate.

[0009] Further: the bidirectional screw assembly includes two screws arranged in opposite directions of thread rotation, a coupling is connected between the two screws, the moving parts of the two screws are respectively fixedly connected to the two sliding connecting plates of the load adjustment mechanism, and a screw mounting seat for supporting the screws is fixed under the two screws, and a servo motor for driving the screw to rotate is provided at one end of one of the screws.

[0010] Further: an anti-skid groove is arranged on the upper side of the turntable to increase the friction between the turntable and the opposite extrusion plate.

[0011] Furthermore: a plurality of flexible rollers distributed in a fan shape are arranged on the opposing extrusion plate, which are used to change the original sliding friction between the opposing extrusion plate and the turntable into rolling friction.

[0012] Further: the control motor assembly includes a control motor, the control motor and the control motor snap-fit ​​seat are a matching mechanism, and also includes a motor fixing seat for fixing the control motor, and a slide cylinder for moving the control motor is provided under the motor fixing seat.

[0013] Further: the motor assembly to be tested includes the motor to be tested, and also includes a motor clamping plate to be tested for clamping the motor to be tested, a linear slide rail for moving the motor to be tested, and a driving component push cylinder are installed at the bottom of the motor clamping plate to be tested, a limit cylinder for limiting the motor to be tested is provided above the push cylinder, and an auxiliary support plate for auxiliary supporting the motor to be tested is installed on the motor clamping plate to be tested.

[0014] A method for detecting back electromotive force of a motor comprises the following steps:

[0015] S1: Adjust the load adjustment mechanism and the load mechanism to the initial state, and match the known back electromotive force motor with the engaging transmission assembly;

[0016] S2: Start the motor with known back electromotive force, measure the motor speed n, measure the motor input current A, and measure the push pressure N of the load adjustment mechanism on the load mechanism;

[0017] S3: Adjust the bidirectional screw assembly to change the push pressure N of the load adjustment mechanism on the load mechanism. After the operation is stable, obtain the push pressure value N1, adjust the motor input current A to stabilize the motor speed, and obtain the motor speed data n1. When the motor speed stabilizes to n1, record the motor input current value A1;

[0018] S4: Adjust the bidirectional screw assembly to change the push pressure N1 of the load adjustment mechanism and the load mechanism. After the operation is stable, obtain the push pressure value N2, adjust the motor input current A, stabilize the motor speed to n1, and record the motor input current value A2;

[0019] S5: Control n1 unchanged in the same way as S4, input multiple groups of push pressures N3, N4, N5, and obtain corresponding A3, A4, A5;

[0020] S6: Separate the motor with known back electromotive force from the engaging transmission assembly, and match the motor assembly to be tested with the engaging transmission assembly;

[0021] S7: The detection instrument module controls the bidirectional screw assembly to adjust the push pressure of the load adjustment mechanism on the load mechanism to N1, adjusts the motor input current to stabilize the motor speed to n1, and records the motor input current A1';

[0022] S8: Adjust the push pressure to N2, N3, N4, and N5 respectively in the manner of S7, and stabilize the speed to n1, and obtain the input current values: A2', A3', A4', and A5';

[0023] S9: Compare the measured data sets A and A' to obtain the back electromotive force of the measured motor.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a motor back-electromotive force detection device, which measures the motor back-electromotive force by a comparison method. The detection instrument module automatically controls the load adjustment mechanism to change the pressure on the load mechanism, and a mature pressure tester is used to monitor the pressure. The motor load during measurement can be accurately changed. Automatic measurement is achieved through the detection instrument module, which greatly reduces the tediousness of manual work. By comparing multiple groups of detection data, more accurate back-electromotive force data of the motor to be tested can be obtained.

[0026] 2. The load mechanism and load adjustment mechanism provided in the present invention set rolling friction between the load mechanism and the load adjustment mechanism, and an anti-skid groove is provided on the friction surface of the turntable to reduce the occurrence of slipping and loss of load when the turntable is squeezed by the flexible roller, so that multiple sets of data can be quickly and stably measured, thereby improving the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 It is a structural schematic diagram of a back electromotive force detection device of a motor according to the present invention;

[0029] Figure 2 is a top view of a back electromotive force detection device of a motor according to the present invention;

[0030] Figure 3 The present invention Figure 2 Sectional view along AA;

[0031] Figure 4 The present invention Figure 3 Magnified view of area B;

[0032] Figure 5 It is a schematic diagram of the assembly of some components of the present invention;

[0033] Figure 6 The present invention Figure 5 Enlarged view of area C in the middle;

[0034] Figure 7 It is a schematic diagram of the assembly of the load adjustment mechanism of the present invention;

[0035] Figure 8 The present invention Figure 7 Magnified view of area D in the middle;

[0036] Fig. 9 It is a flow chart of the motor back electromotive force detection method of the present invention.

[0037] The following are the descriptions of the reference numerals:

[0038] 1. Reference motor assembly; 2. Snap-on transmission assembly; 3. Load mechanism; 4. Motor assembly to be tested; 5. Load adjustment mechanism; 6. Bidirectional screw assembly; 7. Testing instrument module; 8. Rack; 11. Slide cylinder; 12. Motor fixing seat; 13. Reference motor; 21. Snap-on support seat; 22. Transmission bearing; 23. Synchronous shaft sleeve; 24. Connecting shaft; 25. Auxiliary bearing; 26. Snap-on fixing plate; 27. Reference motor snap-on seat; 28. Snap-on seat of motor to be tested; 31. Rotating Support seat; 32, synchronous wheel; 33, turntable; 41, linear slide rail; 42, push cylinder; 43, clamping plate of motor to be tested; 44, motor to be tested; 45, limit cylinder; 46, auxiliary support plate; 51, opposite extrusion plate; 52, guide support rod; 53, pressure tester; 54, sliding pressure plate; 55, compression spring; 56, sliding connecting plate; 57, adjusting nut; 511, flexible roller; 61, screw mounting seat; 62, screw; 63, coupling; 64, servo motor. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0041] The present invention will be further described below in conjunction with the accompanying drawings:

[0042] like Figure 1-Figure 8 As shown, a back electromotive force detection device of a motor includes a frame 8, on which a reference motor component 1 and a motor component to be tested 4 are relatively arranged, a locking transmission component 2 for locking and connecting the reference motor component 1 and the motor component to be tested 4 is arranged between the reference motor component 1 and the motor component to be tested 4, the locking transmission component 2 is connected to a load mechanism 3 for providing a load through a belt drive, the reference motor component 1 and the motor component to be tested 4 are relatively arranged with respect to the locking transmission component 2, and during detection, they are alternately locked and connected with the locking transmission component 2 to measure data, and then the measured data are compared to obtain the back electromotive force of the motor to be tested; the frame also includes a load adjustment mechanism 5, which cooperates with the load mechanism 3 to apply pressure to the load mechanism 3 by clamping and squeezing to change the motor load; when the locking transmission component 2 is locked with the reference motor component 1 or the motor component to be tested 4, the load adjustment mechanism 5 is used to adjust the load mechanism 3 to apply load to the motor to obtain multiple groups of measurement data, and the measurement error is reduced by analysis and comparison.

[0043] The bidirectional screw assembly 6 cooperates with the load adjustment mechanism 5, and a servo motor 64 is provided at one end of the bidirectional screw assembly 6. The servo motor 64 is used to adjust the pressure applied by the load adjustment mechanism 5 to the load mechanism 3; the load adjustment mechanism 5 clamps the load mechanism 3, and the bidirectional screw assembly 6 includes two screw devices with opposite thread rotation directions. The two devices are connected and rotate synchronously, and are driven by a servo motor 64 to perform synchronous clamping or opposite opening.

[0044] The detection instrument module 7, whose control is integrated on one side of the frame 8, is used to detect the pressure applied by the load adjustment mechanism 5 to the load mechanism 3, the motor speed and the motor input current. The precision measuring instruments required for this equipment mainly detect the extrusion pressure applied by the load adjustment mechanism 5 to the three, the input current of the motor and the speed of the motor. The corresponding measuring instruments are existing instruments and equipment that have developed relatively maturely in the market and are relatively low in price.

[0045] As an embodiment of the present invention, Figure 1-4As shown: the engaging transmission assembly 2 includes an engaging support seat 21 fixed on the frame 8, an axial hole is opened at the center of the engaging support seat 21, and mounting flanges are respectively provided at the front and rear ends. A transmission bearing 22 is mounted on the rear end flange of the engaging support seat 21, and a synchronous sleeve 23 is matched with the outer side of the transmission bearing 22. Synchronous teeth are arranged on the outer wall of the synchronous sleeve 23. The synchronous sleeve 23 is connected to the load mechanism 3 through a synchronous belt. An auxiliary bearing 25 is mounted on the front end flange of the engaging support seat 21, and the inner side of the auxiliary bearing 25 cooperates with one end of the synchronous sleeve 23. The connecting shaft 24 is a transmission connection device, which is used to connect the motor and the synchronous sleeve 23. The auxiliary bearing 25 plays a supporting role when the connecting shaft 24 rotates. A locking plate 26 is fixed in the connecting shaft 24. The two ends of the locking plate 26 are respectively fixedly connected with a reference motor locking seat 27 and a motor to be tested locking seat 28 for keying the reference and test end motors. The reference motor locking seat 27 and the motor to be tested locking seat 28 are clearance fits with the motor output end, which can meet the needs of automated matching and meet the locking requirements of motor testing.

[0046] As an embodiment of the present invention, Figure 2 Figure 5 As shown: the load mechanism 3 includes a rotating support seat 31, in which a main shaft is rotatably matched, a synchronous wheel 32 for synchronous transmission is fixed on the main shaft, and the synchronous wheel 32 is connected to the synchronous shaft sleeve 23 through a synchronous belt, and a turntable 33 is fixed to the output end of the main shaft, and the turntable 33 and the load adjustment mechanism 5 are a matching mechanism.

[0047] During specific operation, when the reference motor assembly 1 or the motor assembly to be tested 4 is engaged with the engaging transmission assembly 2, the motor drives the synchronous sleeve 23 to rotate, and the synchronous sleeve 23 pulls the main shaft and the turntable 33 to rotate through the synchronous belt and the synchronous wheel 32. The load adjustment mechanism 5 increases the load of the motor by clamping the turntable 33 to increase the rotational resistance of the turntable 33 and the main shaft.

[0048] As an embodiment of the present invention, Figure 5-8As shown in the figure, the load adjustment mechanism 5 includes two opposing extrusion plates 51 for clamping the rotating disk 33, and the two opposing extrusion plates 51 are slidably matched with a guide support rod 52 for supporting the load adjustment mechanism 5. The two opposing extrusion plates 51 are respectively arranged at the two sides of the rotating disk 33, and the guide support rod 52 plays the role of limiting support, so that the opposing extrusion plates 51 are always kept at a uniform height position during the movement process. The outer side of the opposing extrusion plates 51 and the outer wall of the guide support rod 52 are slidably matched with a sliding pressure plate 54 for pushing the opposing extrusion plates 51, and a sliding pressure plate 54 is set between the sliding pressure plate 54 and the opposing extrusion plates 51. There is a pressure tester 53 for measuring the pushing pressure, and the sliding pressure plate 54 serves as the intermediate component of the pushing opposing extrusion plate 51. The pressure applied to the pressure tester 53 is the pressure applied by the pushing opposing extrusion plate 51 to the turntable 33. A sliding connecting plate 56 for pushing the sliding pressure plate 54 is slidably matched on the outer side of the sliding pressure plate 54 and the outer wall of the guide support rod 52, and the sliding connecting plate 56 and the bidirectional screw assembly 6 are a matching mechanism. A plurality of compression springs 55 are arranged between the sliding connecting plate 56 and the sliding pressure plate 54, and an adjusting nut 57 is arranged at the end of the sliding connecting plate 56 away from the sliding pressure plate 54. The sliding connecting plate 56 serves as a pushing connecting component, and its function is to connect the bidirectional screw assembly 6, push multiple compression springs 55, compress the multiple compression springs 55, push the sliding pressure plate 54, and provide stable pressure for the sliding pressure plate 54. The adjusting nut 57 serves as a limit adjustment component. During the installation and use of the equipment, the adjusting nut 57 is adjusted to make the pushing pressure of the opposing extrusion plates 51 on the two sides of the turntable 33 on the turntable 33 equal in the initial state.

[0049] As an embodiment of the present invention, Figure 5-8 As shown: the bidirectional screw assembly 6 includes two screws 62 arranged in opposite directions of rotation. The screw 62 described in the present invention is an existing complete set of products, which includes a base slide groove, a screw is rotatably matched in the base slide groove, and a moving part is matched on the screw. The moving part can only slide forward and backward under the limit of the slide groove. A coupling 63 is connected between the two screws 62, and the moving parts of the two screws 62 are respectively fixedly connected to the two sliding connecting plates 56 of the load adjustment mechanism 5. A screw mounting seat 61 for supporting the screws 62 is fixed below the two screws 62, and a servo motor 64 for driving the screw 62 to rotate is provided at one end of one of the screws 62. The two screws 62 are connected by a coupling 63 and rotate synchronously under the drive of a servo motor 64. The rotating wires in opposite directions set by them, when rotating synchronously, make the sliding connecting plates 56 fixed to the two screws 62 respectively converge or disperse to open.

[0050] During specific operation, the control system in the detection instrument module 7 controls the servo motor 64 to move the two sliding connecting plates 56 toward the center to clamp the turntable 33. By changing the displacement of the sliding connecting plates 56, the squeezing force on the turntable 33 is changed, thereby changing the load of the motor during the test.

[0051] As an embodiment of the present invention, Figure 8 As shown: an anti-skid groove is provided on the upper side of the rotating disk 33 to increase the friction between the rotating disk 33 and the opposite extrusion plate 51. When the rotating disk 33 rotates, when slipping occurs between it and the opposite extrusion plate 51, the load of the motor will change suddenly, thereby affecting the measurement.

[0052] As an embodiment of the present invention, Figure 8 As shown: the opposing extrusion plate 51 is provided with a plurality of fan-shaped flexible rollers 511, which are used to change the original sliding friction between the opposing extrusion plate 51 and the rotating disk 33 into rolling friction. Compared with sliding friction, when providing load, the rolling friction is more stable throughout the process, and can provide a stable and continuous load without instantaneous slippage, making the measurement result more accurate.

[0053] As an embodiment of the present invention, Figure 3 As shown: the control motor assembly 1 includes a control motor 13, the control motor 13 and the control motor engaging seat 27 are a matching mechanism, and also includes a motor fixing seat 12 for fixing the control motor 13, and a slide cylinder 11 for moving the control motor 13 is provided below the motor fixing seat 12.

[0054] During specific operation, the detection instrument module 7 controls the slide cylinder 11 to make the control motor 13 engage with the control motor engagement seat 27 for transmission, wherein the motor fixing seat 12 and the mounting seat of the slide cylinder 11 are equipped with a limit block for adjusting the moving distance of the control motor 13.

[0055] As an embodiment of the present invention, Figure 2-4As shown in the figure, the motor assembly 4 to be tested includes a motor 44 to be tested, and also includes a motor clamping plate 43 to be tested for clamping the motor 44 to be tested. A linear slide rail 41 for moving the motor 44 to be tested is installed at the bottom of the motor clamping plate 43 to be tested, and a driving component push cylinder 42. The push cylinder 42 pushes the motor clamping plate 43 to be tested to move on the linear slide rail 41 to make it cooperate with or separate from the motor clamping seat 28 to be tested. A limiter for limiting the motor 44 to be tested is provided above the push cylinder 42. The motor 44 to be tested is placed in a clamping limit position, which is convenient for replacing different motors 44 to be tested. A plurality of limit pins are provided on the motor clamping plate 43 corresponding to the mounting holes of the motor 44 to be tested. After the motor 44 to be tested is installed and clamped into the motor clamping plate 43, the limit cylinder 45 pushes and clamps the motor 44 to be tested, so that the cooperation with the motor clamping seat 28 to be tested is more stable. The motor clamping plate 43 to be tested is equipped with an auxiliary support plate 46 for auxiliary support of the motor 44 to be tested. The auxiliary support plate 46 is an elastic telescopic rod assembly, which provides a supporting force for the motor 44 to be tested when the motor 44 to be tested is installed and clamped into the motor clamping plate 43 to be tested, so that it is more stable when working.

[0056] like Fig. 9 As shown, the detection method:

[0057] S1: Adjust the load adjustment mechanism 5 and the load mechanism 3 to the initial state, and match the known back electromotive force motor with the engaging transmission component 2;

[0058] Specifically: the two pressure testers 53 set in the load adjustment mechanism 5 adjust the adjustment nut 57 to make the opposite extrusion plates 51 at both ends of the turntable 33 have equal pressure on it, and the detection instrument module 7 controls the slide cylinder 11 to push the control motor 13 to cooperate with the engaging transmission assembly 2.

[0059] S2: Start the motor with known back electromotive force, measure the motor speed n, measure the motor input current A, and measure the push pressure N of the load adjustment mechanism 5 on the load mechanism 3;

[0060] Specifically: the detection instrument module 7 measures the data of the control motor 13 through the existing measuring instrument.

[0061] S3: Adjust the bidirectional screw assembly 6 to change the push pressure N of the load adjustment mechanism 5 on the load mechanism 3. After the operation is stable, obtain the push pressure value N1, adjust the motor input current A to stabilize the motor speed, and obtain the motor speed data n1. When the motor speed stabilizes to n1, record the motor input current value A1;

[0062] Specifically: N is set by setting the feed amount of the servo motor 64. The servo motor 64 is adjusted through the digital display data of the pressure tester 53 so that N reaches the specific value to be set. The motor speed n1 is achieved by controlling the voltage of the reference motor 13. n1 is a set value, which can be selected within a reasonable range according to the motor model. In this scheme, the selected n1 is used as the quantitative reference measurement. When the speed is stable, the specific value A1 of the input current is obtained by the current detection instrument.

[0063] S4: Adjust the bidirectional screw assembly 6 to change the push pressure N1 of the load adjustment mechanism 5 and the load mechanism 3. After the operation is stable, obtain the push pressure value N2, adjust the motor input current A, stabilize the motor speed to n1, and record the motor input current value A2;

[0064] S5: Control n1 unchanged in the same way as S4, input multiple groups of push pressures N3, N4, N5, and obtain corresponding A3, A4, A5;

[0065] Specifically: Take n1 as the quantity and N as the variable, and use S4 method to obtain the input current of the motor with known electromotive force when it reaches the speed n1 under various loads.

[0066] S6: Separate the known back electromotive force motor from the engaging transmission assembly 2, and match the motor assembly 4 to be tested with the engaging transmission assembly 2;

[0067] S7: The detection instrument module controls the bidirectional screw assembly to adjust the push pressure of the load adjustment mechanism on the load mechanism to N1, adjusts the motor input current to stabilize the motor speed to n1, and records the motor input current A1';

[0068] S8: Adjust the push pressure to N2, N3, N4, and N5 respectively in the manner of S7, and stabilize the speed to n1, and obtain the input current values: A2', A3', A4', and A5';

[0069] S9: Compare the measured data sets A and A to obtain the back electromotive force of the measured motor.

[0070] Specifically: by making the measured motor 44 and the reference motor 13 reach a certain speed under various load conditions, the measured input current data are compared, the values ​​with large errors are eliminated, and an accurate comparison value is obtained, thereby calculating the back electromotive force of the measured motor 44.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A motor back electromotive force detection device, comprising a frame (8), on which a reference motor assembly (1) and a motor assembly to be tested (4) are arranged relative to each other, a locking transmission assembly (2) for locking and connecting the reference motor assembly (1) and the motor assembly to be tested (4) is arranged between the reference motor assembly (1) and the motor assembly to be tested (4), the locking transmission assembly (2) being connected to a load mechanism (3) for providing a load through a belt drive, characterized in that: It also includes a load adjustment mechanism (5), which cooperates with the load mechanism (3) to apply pressure to the load mechanism (3) by clamping and squeezing, thereby changing the motor load; A bidirectional screw rod assembly (6) cooperates with the load adjustment mechanism (5), and a servo motor (64) is provided at one end thereof, and the servo motor (64) is used to adjust the pressure applied by the load adjustment mechanism (5) to the load mechanism (3); The detection instrument module (7) is integrated with a control unit and arranged on one side of the frame (8), and is used to detect the pressure applied by the load adjustment mechanism (5) to the load mechanism (3), the motor speed and the motor input current.

2. The back electromotive force detection device of a motor according to claim 1, characterized in that: The engaging transmission assembly (2) comprises an engaging support seat (21) fixed on the frame (8), an axial hole is provided at the center of the engaging support seat (21), and mounting flanges are provided at the front and rear ends respectively, a transmission bearing (22) is mounted on the rear end flange of the engaging support seat (21), and a synchronous shaft sleeve (23) is matched with the outer side of the transmission bearing (22), and the outer wall of the synchronous shaft sleeve (23) is provided with synchronous teeth, an auxiliary bearing (25) is mounted on the front end flange of the engaging support seat (21), and a connecting shaft (24) is matched with one end of the synchronous shaft sleeve (23) on the inner side of the auxiliary bearing (25), and a engaging fixing plate (26) is fixed in the connecting shaft (24), and a reference motor engaging seat (27) and a motor to be tested engaging seat (28) for keying the reference and tested end motors are respectively fixedly connected at both ends of the engaging fixing plate (26).

3. The back electromotive force detection device of a motor according to claim 2, characterized in that: The load mechanism (3) comprises a rotating support seat (31), a main shaft is rotatably matched in the rotating support seat (31), a synchronous wheel (32) for synchronous transmission is fixed on the main shaft, and the synchronous wheel (32) is connected to the synchronous shaft sleeve (23) through a synchronous belt, a rotating disk (33) is fixed on the output end of the main shaft, and the rotating disk (33) and the load adjustment mechanism (5) are a matching mechanism.

4. The back electromotive force detection device of a motor according to claim 3, characterized in that: The load adjustment mechanism (5) comprises two opposing extrusion plates (51) for clamping the rotating disk (33); the two opposing extrusion plates (51) are slidably matched with a guide support rod (52) for supporting the load adjustment mechanism (5); a sliding pressure plate (54) for pushing the opposing extrusion plates (51) is slidably matched on the outer side of the opposing extrusion plates (51) and the outer wall of the guide support rod (52); a pressure tester (53) for measuring the pushing pressure is provided between the sliding pressure plate (54) and the opposing extrusion plates (51); a sliding connecting plate (56) for pushing the sliding pressure plate (54) is slidably matched on the outer side of the sliding pressure plate (54) and the outer wall of the guide support rod (52); the sliding connecting plate (56) and the bidirectional screw rod assembly (6) form a matching mechanism; a plurality of compression springs (55) are provided between the sliding connecting plate (56) and the sliding pressure plate (54); and an adjusting nut (57) is provided at one end of the sliding connecting plate (56) away from the sliding pressure plate (54).

5. The back electromotive force detection device of a motor according to claim 4, characterized in that: The bidirectional screw assembly (6) comprises two screws (62) arranged in opposite directions of thread rotation, a coupling (63) being connected between the two screws (62), moving parts of the two screws (62) being fixedly connected to two sliding connecting plates (56) of the load adjustment mechanism (5), a screw mounting seat (61) for supporting the screws (62) being fixed below the two screws (62), and a servo motor (64) for driving the screw (62) to rotate being provided at one end of one of the screws (62).

6. The back electromotive force detection device of a motor according to claim 4, characterized in that: An anti-skid groove is provided on the upper side of the rotating disk (33) to increase the friction between the rotating disk (33) and the opposite extrusion plate (51).

7. The back electromotive force detection device of a motor according to claim 6, characterized in that: The opposing extrusion plate (51) is provided with a plurality of flexible rollers (511) distributed in a fan shape, which are used to change the original sliding friction between the opposing extrusion plate (51) and the rotating disk (33) into rolling friction.

8. The back electromotive force detection device of a motor according to claim 1, characterized in that: The control motor assembly (1) comprises a control motor (13), wherein the control motor (13) and the control motor engaging seat (27) form a matching mechanism, and further comprises a motor fixing seat (12) for fixing the control motor (13), and a slide cylinder (11) for moving the control motor (13) is provided below the motor fixing seat (12).

9. The back electromotive force detection device of a motor according to claim 1, characterized in that: The motor assembly (4) to be tested comprises a motor to be tested (44), and also comprises a motor clamping plate (43) to be tested for clamping the motor to be tested (44), a linear slide rail (41) for moving the motor to be tested (44) and a driving component pushing cylinder (42) are installed at the bottom of the motor clamping plate (43), a limiting cylinder (45) for limiting the motor to be tested (44) is arranged above the pushing cylinder (42), and an auxiliary support plate (46) for auxiliary support of the motor to be tested (44) is installed on the motor clamping plate (43).

10. The detection method of the motor back electromotive force detection device according to any one of claims 1 to 9, comprising the following steps, characterized in that: S1: adjusting the load adjustment mechanism (5) and the load mechanism (3) to an initial state, and matching the known back electromotive force motor with the engaging transmission assembly (2); S2: Start the motor with known back electromotive force, measure the motor speed n, measure the motor input current A, and measure the push pressure N of the load adjustment mechanism (5) on the load mechanism (3); S3: adjusting the bidirectional screw assembly (6) to change the push pressure N of the load adjustment mechanism (5) on the load mechanism (3); after the operation is stable, obtaining the push pressure value N1, adjusting the motor input current A to stabilize the motor speed, obtaining the motor speed data n1; when the motor speed stabilizes to n1, recording the motor input current value A1; S4: adjusting the bidirectional screw assembly (6) to change the push pressure N1 of the load adjustment mechanism (5) and the load mechanism (3); after the operation is stable, obtaining the push pressure value N2, adjusting the motor input current A, stabilizing the motor speed to n1, and recording the motor input current value A2; S5: Control n1 unchanged in the same way as S4, input multiple groups of push pressures N3, N4, N5, and obtain corresponding A3, A4, A5; S6: Separate the known back electromotive force motor from the engaging transmission assembly (2), and match the motor assembly to be tested (4) with the engaging transmission assembly (2); S7: the detection instrument module (7) controls the bidirectional screw assembly (6) to adjust the push pressure of the load adjustment mechanism (5) on the load mechanism (3) to N1, adjusts the motor input current to stabilize the motor speed to n1, and records the motor input current A1'; S8: Adjust the push pressure to N2, N3, N4, and N5 respectively in the manner of S7, and stabilize the speed to n1, and obtain the input current values: A2', A3', A4', and A5'; S9: Compare the measured data sets A and A' to obtain the back electromotive force of the measured motor.

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