A coaxial connection fixture for motor testing

Abstract

This application discloses a coaxial connection fixture for motor testing, including a base plate, a motor testing device, a bracket, and a sleeve. The bracket has a motor mounting hole into which the sleeve can be inserted. A through hole for mounting the drive shaft of the motor testing device is formed at the center of the outer end face of the sleeve. A dial indicator is mounted on the drive shaft, with its needle abutting against the inner surface of the motor mounting hole. A mandrel with an inner hole is fitted onto the drive shaft, and a coupling is fitted onto the mandrel. Through coarse and fine calibration, the concentricity of the shaft holes of the separated motor shaft and the drive shaft of the motor testing device can be achieved. This improves the problems of excessive radial force on the extended end of the stepper motor test shaft, which causes excessive shaft diameter deviation and reduced motor life. After sequential adjustment and installation, this connection device can be used to test multiple batches of motors. Furthermore, by installing different annular transition plates in the bracket holes, testing of different motor models can be achieved. The installation is simple and quick, and it has high engineering application value.

Description

Technical Field

[0001] This application relates to the field of ultra-precision assembly and manufacturing technology for aerospace products, and in particular to a coaxial connection tooling for motor testing. Background Technology

[0002] A stepper motor (hereinafter referred to as a motor) is an open-loop control element that converts electrical pulse signals into angular or linear displacement. When a stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle (i.e., the step angle) in a set direction. The amount of angular displacement can be controlled by controlling the number of pulses, thereby achieving accurate positioning.

[0003] Stepper motors are mainly used in satellite antenna servo mechanisms to drive the antenna to the target position. They are key actuators in satellite antenna drive mechanisms, offering advantages such as high reliability, light weight, and high control precision. After assembly, stepper motors undergo multiple tests. Due to upgrades in motor testing equipment, new testing methods require ensuring the concentricity of the testing equipment shaft and the motor shaft within 0.005mm. This ensures that the radial force on the motor shaft is minimized after the two shafts are connected by a coupling, preventing bearing damage and shaft deformation. Such issues can shorten motor life, cause excessive radial runout at the shaft output end, and result in batch scrapping. Summary of the Invention

[0004] To address the aforementioned problems, this application aims to provide a coaxial connection fixture for motor testing, which ensures that the concentricity between the center of the motor mounting hole and the center of the output shaft of the testing equipment is within 0.005mm, thus overcoming the technical challenge of the inability of separate shaft-hole concentricity assembly to meet the requirements.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a coaxial connection fixture for motor testing, comprising a base plate, a motor testing device, a bracket and a sleeve, wherein the bracket is provided with a motor mounting hole, the sleeve can be inserted into the motor mounting hole, and the center of the outer end face of the sleeve is provided with a through hole for mounting the drive shaft of the motor testing device. The motor testing equipment is installed on one side of the base plate, and the bracket is positioned on the other side of the base plate. The sleeve is inserted into the motor mounting hole and the hole is fitted onto the drive shaft. The height difference between the upper semicircle of the sleeve and the outer circle of the drive shaft in three directions is measured using a height measuring ruler and is within the required tolerance value. The position of the bracket on the base plate is marked, and the position of the bracket on the base plate is roughly adjusted so that the center of the sleeve is basically concentric with the drive shaft. The bracket is then roughly tightened to the base plate before the sleeve is removed. A dial indicator is mounted on the drive shaft. The dial indicator needle is aligned with the inner circular surface of the motor mounting hole. The drive shaft drives the dial indicator to rotate. The concentricity of the motor mounting hole and the drive shaft is tested using the dial indicator. The position of the bracket on the base plate is then finely adjusted and tightened. A mandrel with an inner hole is fitted onto the drive shaft, and a coupling is fitted onto the mandrel. The test motor is assembled into the motor mounting hole, and the main shaft of the test motor extends into the inner hole of the mandrel. By tightening the coupling, the main shaft of the test motor is coaxially connected with the drive shaft.

[0006] Preferably, the base plate has a cross-shaped hole, and the bottom of the bracket is connected to the base plate through the cross-shaped hole.

[0007] Preferably, the bracket has an L-shaped structure, including a horizontal connecting plate at the bottom and a vertical mounting plate at the top, the motor mounting hole is opened on the vertical mounting plate, and the horizontal connecting plate is connected to the cross-shaped hole.

[0008] Preferably, the motor mounting hole is a stepped hole structure with a smaller inner end and a larger outer end, and a stepped annular transition plate is fitted and fixed inside it. One end of the main shaft of the test motor is nested on the larger end of the stepped annular transition plate, and the main shaft of the test motor passes through the smaller end of the stepped annular transition plate and extends into the inner hole of the mandrel.

[0009] The beneficial effects of this application are: (1) Through the coarse and fine calibration of the connection device, the concentricity of the shaft holes of the separated motor shaft and the drive shaft of the motor test equipment can be achieved.

[0010] (2) Improved the problem that the radial force on the test shaft extension end of the stepper motor is too large, causing the shaft diameter to jump out of tolerance and the motor life to be reduced.

[0011] (3) After the connection device is adjusted and installed in sequence, multiple batches of motors can be installed and tested. At the same time, by installing different annular transition plates in the bracket holes, different models of motors can be tested. The installation is simple and quick, and it has high engineering application value.

[0012] (4) The installation and adjustment of the connecting device provide a method for ensuring the concentricity of the shaft and hole of the split structure. Attached Figure Description

[0013] Figure 1 This is a breakdown diagram of the base plate, motor testing equipment, bracket, and sleeve of this application.

[0014] Figure 2 This application provides a coarse adjustment diagram of the motor mounting hole and drive shaft of the bracket using a sleeve and a dial indicator needle.

[0015] Figure 3 This application uses a dial indicator to finely adjust the concentricity of the motor mounting hole and the drive shaft.

[0016] Figure 4 This application shows a diagram of the concentric connection of the drive shaft and the motor shaft using a mandrel and coupling.

[0017] Figure 5 This is a cross-sectional view of the bracket in this application.

[0018] Figure 6 This is a cross-sectional view of the annular transition plate in this application.

[0019] Figure 7 This is a side view of the assembly drawing of the motor and the annular transition plate in this application.

[0020] Figure 8 This is a diagram showing the assembly of the test motor into the motor mounting hole of the bracket via an annular transition plate, as per this application.

[0021] In the diagram: 1-Motor testing equipment; 11-Drive shaft; 2-Test motor; 21-Motor spindle; 3-Base plate; 4-Bracket; 41-Vertical mounting plate; 42-Horizontal connecting plate; 4a-Motor mounting hole; 5-Sleeve; 6-Indicator needle; 7-Mandrel; 8-Coupling; 9-Stepped annular transition plate; 10-Height measuring ruler. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] See attached document Figures 1-8 The coaxial connection fixture for motor testing shown includes a base plate 3, a motor testing device 1, a bracket 4, and a sleeve 5. The bracket 4 has a motor mounting hole 4a, into which the sleeve 5 can pass. The outer end face of the sleeve 5 has a through hole (not shown) for mounting the drive shaft 11 of the motor testing device 1. The base plate 3 is preferably made of 2Cr13. Its function is to provide an initial mounting reference for the testing device and the bracket 4, ensuring the reliability of the connection between the two separate mechanisms. The bracket 4, as a component ensuring the coaxiality of the test motor 2 and the motor testing device 1, is also preferably made of 2Cr13. The bracket 4's function is to perform rough and fine adjustments between the motor mounting hole 4a and the drive shaft 11 of the testing device, ensuring that the motor spindle 21 is coaxial with the drive shaft 11 of the testing device when the test motor 2 is mounted on the bracket 4. The sleeve 5, also preferably made of 2Cr13, is used for rough positioning of the bracket 4, providing support for subsequent fine positioning.

[0024] like Figure 1As shown, the motor testing device 1 (the radial runout of the selected motor testing device 1 is required to be ≤0.003mm) is mounted on one side of the base plate 3 (preferably, a connecting hole is opened on the base plate 3, and the motor testing device 1 is fixed to the base plate 3 with screws), and the bracket 4 is arranged opposite on the other side of the base plate 3. Then as... Figure 2 As shown, the sleeve 5 is inserted into the motor mounting hole 4a and the through hole of the sleeve 5 is slidably fitted onto the drive shaft 11, so that the center of the sleeve 5 is basically concentric with the drive shaft 11 of the test equipment. Then, the height difference between the sleeve 5 and the outer circle of the drive shaft 11 in three directions is measured with a height measuring ruler 10 on the upper semicircular surface of the sleeve 5. The difference is within 0.005 mm. The position of the bracket 4 on the base plate 3 is marked. After the bracket 4 is roughly tightened according to the marked position, the sleeve 5 is removed to roughly position the concentricity of the motor mounting hole 4a and the drive shaft 11.

[0025] like Figure 3 As shown, the sleeve 5 is removed, and a dial indicator is mounted on the drive shaft 11. The dial indicator needle 6 abuts against the inner circular surface of the motor mounting hole 4a. The motor testing equipment 1 is started, and the drive shaft 11 drives the dial indicator to rotate. The dial indicator needle 6 performs a runout test within the motor mounting hole 4a of the bracket 4. The bracket 4 is finely adjusted in the X, Y, and Z directions to ensure that the dial indicator runout is within 0.003mm. Then, preferably by repairing the base plate 3 or adding shims, the bracket 4 is tightened on the base plate 3. After tightening, the dial indicator runout is measured again. The above work is repeated to ensure that after the bracket 4 is tightened, the hole of the motor bracket 4 is concentric with the testing equipment within 0.005mm, achieving fine adjustment of the motor mounting hole 4a and the drive shaft 11. The bracket 4 is then fixed on the base plate 3.

[0026] like Figure 4 As shown, a mandrel 7 with an inner hole is sleeved on the drive shaft 11. The mandrel 7 is preferably made of H62 material. The function of this structure is to cooperate with the motor shaft to drive the motor main shaft 21 to rotate. A coupling 8 is sleeved on the mandrel 7, and the test motor 2 is assembled in the motor mounting hole 4a, driving the motor main shaft 21 to extend into the inner hole of the mandrel 7. By fastening the coupling 8, the test motor main shaft 21 is coaxially connected with the drive shaft.

[0027] After measuring the inner circular surface of the motor mounting hole 4a using the dial indicator needle 6, a cross-shaped hole (not shown in the figure) is provided on the base plate 3 to facilitate the fine adjustment and fixation of the bracket 4. The position of the bracket 4 after measurement can be finely adjusted from different directions through the cross-shaped hole so that the motor mounting hole 4a is concentric with the drive shaft 11. Then the bracket 4 is fixed on the base plate 3.

[0028] To facilitate fine-tuning of the bracket 4 based on the measurement difference of the pointer 6, and to ensure the connection and fixation of the bracket 4 to the base plate 3 after fine-tuning, such as... Figure 5As shown, the bracket 4 has an L-shaped structure, including a horizontal connecting plate 42 at the bottom and a vertical mounting plate 41 at the top. The motor mounting hole 4a is formed on the vertical mounting plate 41, and the horizontal connecting plate 42 is connected to the cross-shaped hole. Figure 5 As shown, the horizontal connecting plate 42 has a through hole for connecting to the cross-shaped hole. During operation, the horizontal connecting plate 42 can be driven to fine-tune the motor mounting hole 4a. After fine-tuning, the horizontal connecting plate 42 can be connected to the cross-shaped hole on the base plate 3 from the top. Compared with opening a connection hole on the bottom surface of the vertical mounting plate 41 (which requires connection to the bracket 4 from the bottom of the base plate 3 via screws), the connection hole on the horizontal connecting plate 42 makes it easier to connect the bracket 4 to the base plate 3 after fine-tuning, without affecting the position of the bracket 4 after fine-tuning.

[0029] To accommodate testing operations for motors of different specifications, such as Figure 5-8 As shown, the motor mounting hole 4a is a stepped hole structure with a smaller inner end and a larger outer end. A stepped annular transition plate 9 is fitted and fixed inside it. One end (mounting surface) of the test motor 2 is nested on the larger end of the stepped annular transition plate 9. (The mounting surface has threaded connection holes circumferentially open, and the mounting surface is connected and fixed to the stepped annular transition plate 9 by screws.) Figure 7 (As shown). Then as... Figure 8 As shown, the motor spindle 21 passes through the small end of the stepped annular transition plate 9 and extends into the inner hole of the spindle 7. The stepped annular transition plate 9 is then embedded into the motor mounting hole 4a through corresponding holes, thus assembling and fixing the test motor 2. For motors of different specifications, a stepped annular transition plate 9 with an adaptable structure can be selected, thereby improving the applicability of this connection device. The preferred material for the stepped annular transition plate 9 is 2Cr13.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope of protection, and all such changes and modifications fall within the scope of protection claimed by this utility model.

Claims

1. A coaxial connection tool for motor testing, characterized in that, The device includes a base plate, a motor testing device, a bracket, and a sleeve. The bracket has a motor mounting hole, and the sleeve can be inserted into the motor mounting hole. The outer end face of the sleeve has a through hole for mounting the drive shaft of the motor testing device. The motor testing equipment is installed on one side of the base plate, and the bracket is positioned on the other side of the base plate. The sleeve is inserted into the motor mounting hole and the hole is fitted onto the drive shaft. The height difference between the upper semicircle of the sleeve and the outer circle of the drive shaft in three directions is measured using a height measuring ruler and is within the required tolerance value. The position of the bracket on the base plate is marked, and the position of the bracket on the base plate is roughly adjusted so that the center of the sleeve is basically concentric with the drive shaft. The bracket is then roughly tightened to the base plate before the sleeve is removed. A dial indicator is mounted on the drive shaft. The dial indicator needle is aligned with the inner circular surface of the motor mounting hole. The drive shaft drives the dial indicator to rotate. The concentricity of the motor mounting hole and the drive shaft is tested using the dial indicator. The position of the bracket on the base plate is then finely adjusted and tightened. A mandrel with an inner hole is fitted onto the drive shaft, and a coupling is fitted onto the mandrel. The test motor is assembled into the motor mounting hole, and the main shaft of the test motor extends into the inner hole of the mandrel. By tightening the coupling, the main shaft of the test motor is coaxially connected with the drive shaft.

2. The coaxial connection tool of claim 1, wherein: The base plate has a cross-shaped hole, and the bottom of the bracket is connected to the base plate through the cross-shaped hole.

3. The coaxial connection tool of claim 2, wherein: The bracket has an L-shaped structure, including a horizontal connecting plate at the bottom and a vertical mounting plate at the top. The motor mounting hole is opened on the vertical mounting plate, and the horizontal connecting plate is connected to the cross-shaped hole.

4. The coaxial connection tool according to claim 1 or 2 or 3, characterized in that: The motor mounting hole is a stepped hole structure with a smaller inner end and a larger outer end, and a stepped annular transition plate is fitted and fixed inside it. One end of the test motor spindle is nested on the larger end of the stepped annular transition plate, and the test motor spindle passes through the smaller end of the stepped annular transition plate and extends into the inner hole of the mandrel.

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