Manual centering calibration device and calibration method for coupling motor

Abstract

The invention discloses a manual centering calibration device and calibration method for a coupling motor, and relates to the technical field of coupling motor calibration, and the calibration device comprises a test bench, a reference motor, a reference shaft, a tested motor, a shaft to be adjusted, a coupler, a laser emission unit, a light passing calibration unit, and an imaging unit. The reference shaft is connected with the reference motor, the to-be-adjusted shaft is connected with the tested motor, the reference shaft is connected with the to-be-adjusted shaft through a coupling, the laser emission unit is arranged on the reference shaft, and the light-passing calibration unit and the imaging unit are arranged on the to-be-adjusted shaft; n beams of laser emitted by the laser emitting unit form a plurality of light spots on the imaging unit through the light passing calibration unit, and whether centering is achieved or not is judged by manually adjusting the position of the tested motor and observing the number of the light spots on the imaging unit. The device and the method are based on a three-point measurement method, the laser emitting unit is arranged on the coupler, manual centering calibration is carried out in a visual mode, the structure is simple, operation is convenient, and precision is high.

Description

Technical Field

[0001] The invention relates to the technical field of coupling motor calibration, and in particular to a manual centering calibration device and a calibration method for a coupling motor. Background Art

[0002] During the motor test process, the motor test bench coupling plays a vital role, which is responsible for connecting the motor to be tested with the dynamometer motor. The alignment accuracy of the coupling has a direct impact on the vibration performance of the system. It must ensure the effective transmission of torque while minimizing the vibration and adverse effects caused by misalignment to ensure the accuracy and consistency of the test results. Therefore, when installing the motor, it is necessary to accurately calibrate the alignment of the motor shafts at both ends of the coupling, including radial and angular alignment.

[0003] At present, there are two main methods for calibrating the alignment of couplings: automatic calibration and manual calibration. Although automatic calibration is efficient and accurate, it relies on a complex set of automatic alignment diagnostic devices and execution systems, which makes the modification of the dynamometer system complicated, the factory debugging process cumbersome, and the cost is high, which is not conducive to large-scale rapid production. In contrast, manual calibration mainly relies on manual vision and manual operation. This method is time-consuming and laborious, with low accuracy and speed. In addition, due to the lack of a quantitative alignment diagnostic mechanism, the main error often comes from the instability of the manual visual process. Therefore, there is an urgent need for a simple and fast calibration device to assist manual visual alignment judgment to solve the calibration problem in the manual calibration process.

[0004] Among the existing calibration technologies, there are two patent technologies that disclose laser centering calibration devices and methods for motor coupling devices. The patent application with publication number CN116412841A proposes a multi-dimensional laser centering instrument calibration device, which adopts CCD laser sensing technology. It includes a portable host, two linear laser transmitters and two CCD receivers. The device determines whether the two ends of the motor coupling are on the same axis by calculating the center point of the laser beam in the irradiated area. Another patent application with publication number CN117685908A proposes a coupling laser centering calibration optical structure using an optical prism reflection structure. This structure solves the problem that the transmitting unit and the receiving unit are easily affected by the motor shaft during installation, and it is difficult to accurately place the tooling at the center of the axis of symmetry. This method uses an industrial camera system to collect the shape of the laser imaging light spot, and then calculates the eccentricity to achieve centering calibration.

[0005] Both of these electronic calibration systems for motor shaft alignment are based on the principle of laser imaging. By collecting the position of the imaging light spot and performing precise calculations, they can quantitatively calibrate the alignment of the coupling system, and have the advantages of high automation and high precision. However, the disadvantages of these systems are that the imaging device has a complex structure and needs to be equipped with a computer host or PLC controller as an operation unit, which involves additional technical links such as the operation processor, power supply system, interface system, and software control program, which significantly increases the complexity and cost of the system and is not conducive to the mass production of dynamometer bench auxiliary alignment devices. Summary of the invention

[0006] The purpose of the present invention is to provide a manual centering calibration device and calibration method for a coupling motor, so as to solve the above-mentioned technical problems existing in the prior art.

[0007] To achieve the above object, on the one hand, the present invention provides a manual centering and calibration device for a coupling motor, comprising: A test bench having a fixed end and a centering adjustment end, wherein the centering adjustment end can be adjusted in multiple directions and in angle relative to the fixed end; A reference motor is fixedly connected to the fixed end of the test bench, the reference motor is connected to a reference shaft, one end of the reference shaft is connected to the reference motor, and the other end is connected to the shaft to be adjusted through a coupling; A motor under test, the motor under test being fixed to the centering adjustment end of the test bench and connected to an end of the shaft to be adjusted away from the coupling; A laser emitting unit is sleeved on the outside of the coupling, and a plurality of laser emitters are connected to the laser emitting unit; A light-through calibration unit is sleeved on the axis to be adjusted on one side of the optical path of the laser emitter, and the light-through calibration unit includes two layers of light-through bodies, both of which are provided with arc-shaped light-through slits corresponding to the number and position of the laser emitters, and the arc center of each arc-shaped light-through slit coincides with the axis center of the axis to be adjusted; The imaging unit is located at a side of the light-through calibration unit away from the laser emitting unit, and is used for receiving the laser beam passing through the light-through calibration unit and displaying it as an image.

[0008] In an optional embodiment, three laser emitters are evenly installed circumferentially on the laser emitting unit, and the three laser emitters emit parallel laser beams in the direction of the axis to be adjusted.

[0009] In an optional embodiment, three arc-shaped light-transmitting slits are evenly arranged along the circumference of the light-transmitting body, and the radial distance between each arc-shaped light-transmitting slit and the axis of the axis to be adjusted is equal.

[0010] In an optional embodiment, the width of the arc-shaped light-transmitting slit is smaller than the diameter of the laser beam emitted by the laser emitter.

[0011] In an optional implementation, the width of the arc-shaped light-transmitting slit is 0.3 mm to 0.5 mm.

[0012] In an optional implementation, the distance between the two layers of light-transmitting bodies is 30 mm.

[0013] In an optional implementation, the imaging unit is made of a light-proof imaging material.

[0014] In an optional implementation, the imaging unit is fixed to the test bench via an imaging unit bracket, and the imaging unit is fixed to the imaging unit bracket in a pluggable and detachable manner.

[0015] In an optional embodiment, the centering adjustment end of the test bench adjusts the tested motor in translation, elevation and horizontal rotation through a hand-cranked wheel.

[0016] On the other hand, the present invention further provides a manual centering calibration method for a coupling motor, using any of the manual centering calibration devices for a coupling motor described above, comprising the following steps: S1, using a laser emitting unit to emit n parallel laser beams to the light calibration unit, and forming a light spot on the imaging unit, where n≥3; S2. Visually check the number of light spots on the molding unit: If there are less than n light spots, it means that the axis to be adjusted is not aligned, and it is necessary to proceed to step S3 for adjustment; If the number of light spots is equal to n, it means that the axis to be adjusted has been centered, and then the process goes to step S4; S3, manually adjust the centering adjustment end to change the spatial position of the motor under test and the axis to be adjusted until n light spots appear on the imaging unit; S4. If the axis to be adjusted is rotated arbitrarily and there are always n light spots on the imaging unit, it proves that the reference motor and the tested motor have been successfully aligned.

[0017] Compared with the prior art, the technical effects disclosed in the present invention are as follows: the device and method of the present invention are based on a three-point measurement method, a laser emitting unit is arranged on the coupling, and manual centering calibration is performed visually, with a simple structure, easy operation and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 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 work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the calibration device of the present invention; Figure 2 It is a structural schematic diagram of a light transmission calibration unit in the calibration device of the present invention; Figure 3 It is a front view of the laser emitting unit in the calibration device of the present invention; Figure 4 This is a diagram showing the light spot imaging of the imaging unit in the calibration device of the present invention; In the figure: 1. imaging unit; 2. light-through calibration unit; 21. light-through body 1; 22. light-through body 2; 23. hollow tube; 24. center mounting hole; 25. arc-shaped light-through slit; 3. laser emitting unit; 31. laser emitter 1; 32. laser emitter 2; 33. laser emitter 3; 4. reference axis; 5. imaging unit bracket; 6. axis to be adjusted; 7. coupling; 8. motor under test; 9. reference motor. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to solve the problem of complex structure of imaging device and operation system of electronic calibration system in the prior art, the present invention provides a low-cost manual centering and calibration device for coupling motors. According to the optical structure and three-point measurement principle of the device, through the calibration of laser calibration auxiliary mechanism and manual adjustment method, the 8-axis of the motor under test and the 9-axis of the reference motor at the dynamometer end are aligned, replacing the complex and expensive electronic calibration system, and realizing a convenient and fast centering and calibration process.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figures 1 to 4As shown, the present invention provides a manual centering calibration device for a coupling motor, including a test bench, a reference motor 9, a reference shaft 4, a test motor 8, a shaft to be adjusted 6, a coupling 7, a laser emitting unit 3, a light-through calibration unit 2, and an imaging unit 1. The test bench (not shown in the figure) has a horizontal test platform, including a fixed end and a centering adjustment end, the fixed end is used to fix and install the reference motor 9, the centering adjustment end is used to fix and install the test motor 8, and the centering adjustment end can perform multi-directional position adjustment and angle adjustment relative to the fixed end, specifically including translation, lifting, and horizontal rotation. The reference motor 9 is fixedly connected to the fixed end of the test bench, and its output end is connected to the reference shaft 4, one end of the reference shaft 4 is connected to the reference motor 9, and the other end is connected to the shaft to be adjusted 6 through the coupling 7. The test motor 8 is fixed to the centering adjustment end of the test bench, and its output shaft is connected to the shaft to be adjusted 6, the free ends of the shaft to be adjusted 6 and the reference shaft 4 are close, and the coupling 7 is sleeved on the outside of the shaft to be adjusted 6 and the reference shaft 4. The imaging unit 1 is arranged on the imaging unit bracket 5, and the imaging unit bracket 5 is fixedly mounted on the test bench. The imaging unit 1 is located at the periphery of the axis 6 to be adjusted and is perpendicular to the axis 6 to be adjusted but not in contact with it. The imaging unit 1 is away from the coupling 7 and is used to receive the laser beam emitted by the laser emitting unit 3 and form a light spot on its imaging surface. The laser emitting unit 3 is sleeved on the outside of the coupling 7 and is used to emit a calibration laser beam to the imaging unit 1. The laser emitting unit 3 is a circular cylindrical structure, and n laser emitters are evenly installed circumferentially on the end surface facing the imaging unit 1, wherein n is an integer greater than or equal to 3, and the spacing between each laser emitter is the same, and the distance from the axis of the axis 6 to be adjusted is also the same. The through-light calibration unit 2 is located between the laser emitting unit 3 and the imaging unit 1, and is sleeved on the axis 6 to be adjusted on one side of the optical path of the laser emitter, allowing the laser beam to pass through and be imaged on the imaging unit 1. The light-through calibration unit 2 is a double-ring target-shaped cylinder with a double-layer ring light-through structure, including two layers of light-through bodies and a hollow tube 23 connecting the two light-through bodies, and a central mounting hole 24 penetrating the light-through body 1 21, the hollow tube 23 and the light-through body 22 is opened in the center. The central mounting hole 24 is used for fixed sleeve connection with the shaft 6 to be adjusted. The shape and size of the light-through body 1 21 and the light-through body 22 are the same, and the two are arranged at a certain distance. One end of the hollow tube 23 is connected to the light-through body 1 2 The other end is connected to the second light-transmitting body 22. The two layers of light-transmitting bodies are provided with arc-shaped light-transmitting slits 25 for the laser to pass through. The number and position of the arc-shaped light-transmitting slits 25 correspond to the number and position of the laser emitters. The arc center of each arc-shaped light-transmitting slit 25 coincides with the axis of the axis to be adjusted 6, that is, the length and width of each arc-shaped light-transmitting slit 25 are equal, and the spacing between two adjacent arc-shaped light-transmitting slits 25 is the same, and the radial distance between the arc-shaped light-transmitting slit 25 and the axis of the axis to be adjusted 6 is strictly equal.

[0024] The calibration device of the above structure includes a laser emitting unit 3 arranged on the shaft of the reference motor 9, a through-light calibration unit 2 and an imaging unit 1 arranged on the shaft of the motor under test 8; the laser emitted by the laser emitting unit 3 forms a plurality of light spots on the imaging unit 1 through the through-light calibration unit 2, and the position of the motor under test 8 is manually adjusted and the number of light spots on the imaging unit 1 is observed to determine whether the alignment is achieved. The present invention is based on the three-point measurement method, the laser emitting unit 3 is arranged on the coupling 7, and manual alignment calibration is performed visually, with a simple structure, convenient operation and high precision.

[0025] As a preferred embodiment, three laser emitters are evenly installed on the laser emitting unit 3 in the circumferential direction. Figure 3 As shown, they are laser emitter 1 31, laser emitter 2 32, and laser emitter 3 33. The three laser emitters emit parallel laser beams in the direction of the axis to be adjusted 6. At the same time, three arc-shaped light-through slits 25 are evenly arranged along the circumference of the light-through body, and the radial distance between each arc-shaped light-through slit 25 and the axis of the axis to be adjusted 6 is equal.

[0026] In some embodiments, the structure of the light calibration unit 2 is as follows: Figure 2 As shown, Figure 2 (a) shows a front view of the light clearance calibration unit 2, Figure 2 (b) shows a side view of the light clearance calibration unit 2, Figure 2 (c) shows an axonometric view of the clearance calibration unit 2 .

[0027] In some embodiments, the distance between the two light-transmitting bodies is 30 mm. Each light-transmitting body is provided with three axially concentric arc-shaped light-transmitting slits 25, the width of which is smaller than the diameter of the laser beam emitted by the laser emitter, and the width of which is preferably 0.3 mm to 0.5 mm.

[0028] In the above embodiment, the imaging unit 1 is made of an opaque imaging material. Preferably, the imaging unit 1 can be made of a white acrylic material, which can intercept the light beam and form a clear and visible light spot.

[0029] In some embodiments, the imaging unit 1 is fixed to the test bench by an imaging unit bracket 5. The imaging unit bracket 5 can be installed on the test bench by bolts, and a slot is provided on the top of the imaging unit bracket 5, and the slot can accommodate the stable insertion of the imaging unit 1, and a pluggable connection method is adopted to facilitate the assembly and fixation of the imaging unit 1.

[0030] In some embodiments, the centering adjustment end of the test bench performs translation, lifting and horizontal rotation adjustment on the test motor 8 through a hand wheel, and the hand wheel is connected to an adjustment mechanism, and the position adjustment of the adjustment mechanism is achieved by rotating the hand wheel. Specifically, the selection of the adjustment mechanism can adopt mature technologies in this field, for example, a three-axis linkage device plus a rotating mechanism can be used. The three-axis linkage device is usually composed of three independent adjustment devices, which respectively control the movement in the three directions of X, Y, and Z. Each adjustment device includes components such as a fixed base, a locking device, an optical axis fixing plate, a guide shaft, an adjustment screw and a lifting and adjusting handle. By rotating the lifting and adjusting handle, the adjustment screw can be driven to perform precise linear motion, thereby achieving precise adjustment of components such as a work surface or a detection coil. The rotating mechanism is used to rotate the three-axis linkage device in an angular manner on a horizontal plane.

[0031] Working principle of the calibration device according to the embodiment of the present invention: like Figure 4 As shown, Figure 4 (a) shows a state diagram when it is not aligned. Figure 4 (b) shows another state diagram when it is not aligned. Figure 4 (c) shows the state diagram of the alignment. According to the principle of three points in one line, when the center of the laser emitter and the two layers of light slits of the calibration unit light pass are in the same straight line, the laser beam can form a light spot in the imaging unit 1, otherwise the laser beam is blocked by the light pass. Figure 4 As shown, during the specific implementation process, the laser emitters of the three laser emitting units 3 are turned on to emit three laser beams, which all pass through the arc-shaped light slit 25 to form three light spots on the imaging unit 1; if the number of light spots on the imaging unit 1 is less than 3, the three dimensions of translation, lifting, and horizontal rotation of the tested motor 8 are manually adjusted to change the relative position and relative angle between the axis to be adjusted 6 and the reference axis 4 until three light spots are formed on the imaging unit 1; further, the motor shaft is manually rotated to any other angle. If there are always three light spots on the imaging unit 1, it proves that the two axes of the reference motor 9 and the tested motor 8 are parallel and coincident at this time, and the two coupling motors have completed the axis alignment.

[0032] An embodiment of the present invention further provides a manual centering calibration method for a coupling motor, using the manual centering calibration device for a coupling motor described in any one of the above embodiments, comprising the following steps: S1. Use the laser emitting unit 3 to emit n parallel laser beams to the light calibration unit 2, and form a light spot on the imaging unit 1, where n≥3; pay attention to keeping the reference motor 9, the test motor 8, the reference axis 4 and the axis to be adjusted 6 stationary.

[0033] S2. Visually check the number of light spots on the molding unit: If the number of light spots is less than n, it means that the axis 6 to be adjusted is not aligned, and it is necessary to proceed to step S3 for adjustment; If the number of light spots is equal to n, it means that the axis 6 to be adjusted has been centered, and the process goes to step S4.

[0034] S3. Manually adjust the centering adjustment end to change the spatial position of the motor under test 8 and the axis to be adjusted 6 until n light spots appear on the imaging unit 1; specifically, manually shake the hand wheels in the translation direction and the lifting direction on the test bench to change the spatial position of the motor under test 8 and the adjustment axis until n laser beams pass through the light calibration unit 2 and are imaged on the imaging unit 1 to form n light spots.

[0035] S4. Rotate the axis 6 to be adjusted arbitrarily. If there are always n light spots on the imaging unit 1, it proves that the reference motor 9 and the motor under test 8 have been successfully aligned. Specifically, manually rotate the axis 6 to be adjusted to any other angle. If there are always n light spots on the imaging unit 1, it proves that the two axes of the reference motor 9 and the motor under test 8 are parallel and coincident, and the two coupling motors have completed the axis alignment.

[0036] Compared with the prior art, the calibration device and method of the embodiments of the present invention provide at least the following beneficial effects: The calibration device of the present invention has a simple structure. By using a combination of the laser emitting unit 3, the through-light calibration unit 2 and the imaging unit 1, the structure of the centering calibration device is simplified, and the manufacturing and maintenance costs are reduced.

[0037] The calibration device of the present invention is easy to operate, and can be adjusted in translation, lifting and horizontal rotation by a hand-cranked wheel, making the centering process faster and more convenient.

[0038] High-precision centering calibration is achieved by using the parallel laser beam emitted by the laser transmitter and the arc-shaped light slit 25 of the light calibration unit 2. Accurate centering calibration helps to ensure the accuracy and consistency of the test results, which is crucial for the evaluation of motor performance.

[0039] Whether the axis 6 to be adjusted is aligned is judged by the number of light spots on the imaging unit 1, which provides a quantitative alignment diagnosis mechanism and reduces human errors.

[0040] The device is suitable for the centering calibration of various coupling motors and has good versatility and adaptability.

[0041] Compared with complex automatic calibration systems, the present invention provides a more cost-effective solution suitable for large-scale rapid production. Through rapid centering and calibration, the time for motor installation and commissioning is shortened, and production efficiency is improved.

[0042] The details not described in detail in the present invention are all conventional technical means well known to those skilled in the art.

[0043] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A manual centering and calibration device for a coupling motor, characterized in that: include: A test bench having a fixed end and a centering adjustment end, wherein the centering adjustment end can be adjusted in multiple directions and in angle relative to the fixed end; A reference motor (9) is fixedly connected to the fixed end of the test bench, the reference motor (9) is connected to a reference shaft (4), one end of the reference shaft (4) is connected to the reference motor (9), and the other end is connected to the shaft to be adjusted (6) via a coupling (7); A motor under test (8), the motor under test (8) being fixed to the centering adjustment end of the test bench and connected to an end of the shaft to be adjusted (6) away from the coupling (7); A laser emitting unit (3) is sleeved on the outside of the coupling (7), and a plurality of laser emitters are connected to the laser emitting unit (3); A light-through calibration unit (2) is sleeved on the axis to be adjusted (6) on one side of the optical path of the laser emitter, the light-through calibration unit (2) comprising two layers of light-through bodies, both layers of light-through bodies being provided with arc-shaped light-through slits (25) corresponding to the number and position of the laser emitters, the arc center of each of the arc-shaped light-through slits (25) coinciding with the axis center of the axis to be adjusted (6); An imaging unit (1) is located on a side of the light-clearance calibration unit (2) away from the laser emitting unit (3) and is used for receiving the laser beam passing through the light-clearance calibration unit (2) and displaying it as an image.

2. The manual centering and calibration device for a coupling motor according to claim 1, characterized in that: The laser emitting unit (3) has three laser emitters evenly mounted on the circumference thereof, and the three laser emitters emit parallel laser beams in the direction of the axis (6) to be adjusted.

3. The manual centering and calibration device for a coupling motor according to claim 2, characterized in that: Three arc-shaped light-transmitting slits (25) are evenly arranged along the circumference of the light-transmitting body, and the radial distance between each arc-shaped light-transmitting slit (25) and the axis of the axis to be adjusted (6) is equal.

4. The manual centering and calibration device for a coupling motor according to claim 3, characterized in that: The width of the arc-shaped light-transmitting slit (25) is smaller than the diameter of the laser light beam emitted by the laser emitter.

5. The manual centering and calibration device for a coupling motor according to claim 4, characterized in that: The width of the arc-shaped light-transmitting slit (25) is 0.3 mm to 0.5 mm.

6. The manual centering and calibration device for a coupling motor according to claim 3, characterized in that: The distance between the two layers of light-transmitting bodies is 30 mm.

7. The manual centering and calibration device for a coupling motor according to claim 1, characterized in that: The imaging unit (1) is made of a light-proof imaging material.

8. The manual centering and calibration device for a coupling motor according to claim 5, characterized in that: The imaging unit (1) is fixed to the test bench via an imaging unit bracket (5); the imaging unit (1) is fixed to the imaging unit bracket (5) in a pluggable and detachable manner.

9. The manual centering and calibration device for a coupling motor according to claim 1, characterized in that: The centering adjustment end of the test bench is used to adjust the translation, lifting and horizontal rotation of the motor under test (8) through a hand-cranked wheel.

10. A manual centering and calibration method for a coupling motor, using the manual centering and calibration device for a coupling motor according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, using a laser emitting unit (3) to emit n parallel laser beams to the light calibration unit (2), and forming a light spot on the imaging unit (1), wherein n≥3; S2. Visually check the number of light spots on the molding unit: If the number of light spots is less than n, it means that the axis to be adjusted (6) is not aligned, and it is necessary to proceed to step S3 for adjustment; If the number of light spots is equal to n, it means that the axis to be adjusted (6) has been centered, and the process goes to step S4; S3, manually adjusting the centering adjustment end to change the spatial position of the motor under test (8) and the shaft to be adjusted (6) until n light spots appear on the imaging unit (1); S4. When the axis to be adjusted (6) is rotated arbitrarily, there are always n light spots on the imaging unit (1), which proves that the reference motor (9) and the motor to be tested (8) have been successfully aligned.

Images