Thrust testing device of linear motor

Abstract

The utility model relates to the technical field of linear motor testing, in particular to a thrust testing device of a linear motor. The utility model provides a thrust testing device of a linear motor. The thrust testing device comprises a linear module assembly, a linear motor testing tool, a power supply assembly and a force sensor. The linear motor test tool is installed on the linear module assembly, so that a mandrel in the linear motor test tool is in a horizontal state; the power supply assembly is used for inputting current to a stator coil in the linear motor test tool; the linear module assembly comprises a sliding block, the force sensor is installed on the sliding block, and the sliding block is used for driving the force sensor to be close to or away from the mandrel. When the thrust testing device of the linear motor is used for carrying out specific thrust testing on the linear motor, the problem of poor thrust testing consistency caused by manual visual errors and measurement errors can be avoided, and the screening difficulty of a subsequent complete machine unit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of linear motor testing, in particular to a thrust testing device for a linear motor. Background Art

[0002] At present, a spring tension and compression tester is used to test the thrust ratio of linear motors to select a pair of linear motors with the closest performance. The specific thrust test is as follows: first assemble the motor stator, mover and test fixture as a whole, then place the motor horizontally so that the mover is in a natural static state. At this time, the mover is in a balanced position (the center of the mover and stator are aligned), and then use a marker to mark the intersection of the end face of the end cover of the test fixture and the cylindrical surface of the end of the core shaft on the end of the core shaft exposed from the test fixture; then place the motor vertically on the tray of the spring tension and compression tester, ensuring that the end of the core shaft marked with a marker is facing up, and then apply a direct current (about 0.3A). When applying direct current, pay attention to the direction of the current, and the mover should have a tendency to move upward. At this time, manually observe that the mark on the core shaft is coplanar with the upper surface of the test fixture, so that the mover is in a balanced position, and record the current I at this time 0， Then adjust the upper plate and mover of the spring tension and compression test machine to a critical contact state, so that the displacement and force of the spring tension and compression test machine are reset to zero; then apply currents of I0+1A and I0+2A respectively, and record the corresponding stress readings respectively. Finally, use the specific thrust calculation formula to calculate the specific thrust.

[0003] However, since the balance position mark in the above method is marked on the end of the core shaft with a marker pen, and when a small current is passed to find the balance position, there is a certain deviation between the marked curve and the upper end surface of the test fixture. It can be seen that when using a spring tension and compression testing machine to measure the specific thrust of a linear motor, it is necessary to manually observe whether the marked line and the upper end surface of the test fixture are coplanar when marking the balance position and passing a small current to find the balance position. Therefore, it is impossible to completely avoid the problem of poor consistency of test thrust due to manual visual errors, which increases the difficulty of subsequent screening of complete machine units. Utility Model Content

[0004] (I) The problem to be solved by the utility model is that when a spring tension and compression testing machine is used to measure the specific thrust of a linear motor, human eye observation is required when marking the equilibrium position and passing a small current to find the equilibrium position. Therefore, the problem of poor consistency of the test thrust due to artificial visual errors cannot be completely avoided, which increases the difficulty of subsequent screening of complete machine units.

[0005] (II) Technical solution

[0006] A thrust test device for a linear motor, comprising a linear module assembly, a linear motor test fixture, a power supply assembly and a force sensor;

[0007] The linear motor test fixture is installed on the linear module assembly so that the mandrel in the linear motor test fixture is in a horizontal state;

[0008] The power supply assembly is used to input current to the stator coil in the linear motor test fixture;

[0009] The linear module assembly includes a slider, the force sensor is mounted on the slider, the slider is used to drive the force sensor to approach or move away from the core shaft, and the axis of the force sensor is colinear with the axis of the core shaft.

[0010] According to one embodiment of the utility model, the thrust testing device of the linear motor also includes at least one displacement sensor, which is mounted on the linear module assembly and is arranged on a side of the linear motor testing tooling away from the force sensor, and is used to measure the distance between the end face of the core shaft close to the displacement sensor and the displacement sensor.

[0011] According to an embodiment of the utility model, two displacement sensors are provided, one of which is provided on a side of the linear motor test fixture away from the force sensor, and the other displacement sensor is installed on the slider.

[0012] According to one embodiment of the utility model, the thrust testing device of the linear motor comprises a support seat, the support seat is mounted on the linear module assembly, the support seat comprises two support plates, and the linear motor testing tooling is detachably mounted between the two support plates.

[0013] According to an embodiment of the utility model, the top of the support plate has an arc groove matching the linear motor test fixture, and a screw hole is opened on the support plate near the force sensor, and a ball spring screw is installed in the screw hole.

[0014] According to one embodiment of the utility model, the linear motor test fixture includes a first end cover, a second end cover, a core shaft, a mover and a stator, the stator is installed between the first end cover and the second end cover, a sealed cavity is formed between the first end cover, the stator and the second end cover, the mover is coaxially arranged with the stator, and the mover is located in the cavity, the core shaft is coaxially installed on the mover, and the two ends of the core shaft respectively pass through the first end cover and the second end cover.

[0015] According to one embodiment of the utility model, the linear motor test fixture includes at least one bolt, and the sides of the first end cover and the second end cover are provided with fixing rings, and the fixing rings are evenly provided with multiple U-shaped notches around their axes, and the U-shaped notches on the first end cover correspond one by one to the U-shaped notches on the second end cover, and the bolt passes through one of the U-shaped notches on the first end cover and comes out of one of the U-shaped notches on the second end cover, and a nut is installed on the end of the bolt.

[0016] According to an embodiment of the utility model, mounting holes are respectively opened at the centers of the first end cover and the second end cover, and linear motion ball bearings are arranged in the mounting holes.

[0017] According to an embodiment of the utility model, a vertically arranged column is provided on the top of the sliding block, the force sensor is detachably mounted on the column, and the force sensor is perpendicular to the column.

[0018] According to one embodiment of the utility model, the linear module assembly includes a housing, a stepper motor and a lead screw, the lead screw is rotatably installed in the housing, the output end of the stepper motor is connected to one end of the lead screw, the slider is slidably installed in the housing and the lead screw is threadedly connected.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a thrust testing device for a linear motor. When the thrust testing device for a linear motor is used to perform a relative thrust test on the linear motor, it is only necessary to observe whether the value of the force sensor falls within a set threshold value, which can indicate that the force sensor has just contacted the end of the core shaft. There is no need to manually mark the core shaft with a marker pen, and there is no need to manually observe whether the marked position is on the upper end surface of the test tooling. This can avoid the problem of poor consistency in test thrust due to manual visual errors, and reduces the difficulty of subsequent screening of complete machine units. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A structural diagram provided for an embodiment of the utility model;

[0023] Figure 2 A side view of a linear motor test fixture provided by an embodiment of the utility model;

[0024] Figure 3 The embodiment of the utility model provides Figure 2 Sectional view of AA in the middle;

[0025] Figure 4 A structural diagram of a support plate provided in an embodiment of the utility model.

[0026] Icons: 1. Housing; 2. Linear motor test fixture; 201. First end cover; 202. Second end cover; 203. Stator; 204. Mover; 205. Mandrel; 206. Linear motion ball bearing; 207. Bolt; 208. Spring; 209. Nut; 210. Fixing ring; 211. U-shaped notch; 3. Slider; 4. Stepper motor; 5. Column; 6. Force sensor; 7. First laser displacement sensor; 8. Support plate; 9. Ball spring screw; 10. Second laser displacement sensor. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-Figure 4 As shown, an embodiment of the utility model provides a thrust testing device for a linear motor, comprising a linear module assembly, a linear motor testing fixture 2, a power supply assembly and a force sensor 6; the linear motor testing fixture 2 is installed on the linear module assembly so that the core shaft 205 in the linear motor testing fixture 2 is in a horizontal state; the power supply assembly is used to input current to the stator coil in the linear motor testing fixture 2; the linear module assembly comprises a slider 3, the force sensor 6 is installed on the slider 3, the slider 3 is used to drive the force sensor 6 to move closer to or away from the core shaft 205, and the axis of the force sensor 6 is collinear with the axis of the core shaft 205.

[0029] In this embodiment, when the thrust test device of the linear motor is used to perform a thrust test on the linear motor, the following steps are included:

[0030] Step 1: Install the linear motor test fixture 2 onto the support base of the linear module assembly, ensuring that the core shaft 205 of the linear motor test fixture 2 is in a horizontal state.

[0031] Step 2: Control the linear module assembly with the force sensor 6 to move toward the linear motor test fixture 2 according to the set step distance, and read the value F of the force sensor 6 in real time, and determine the relationship between the value F of the force sensor 6 and the set value;

[0032] If the value F of the force sensor 6 is greater than or equal to the set value, it indicates that the force sensor 6 and the end of the core shaft 205 meet the contact condition;

[0033] If the value F of the force sensor 6 is less than the set value, the linear module assembly is controlled to continue to drive the force sensor 6 to move toward the linear motor test fixture 2 until the contact condition is met.

[0034] Step 3: When the force sensor 6 and the end of the mandrel 205 meet the contact condition, the linear module assembly is controlled to move the force sensor 6 in a direction away from the linear motor test fixture 2 by a set distance, and the value F1 of the force sensor 6 is read and the relationship between the value F1 of the force sensor 6 and the set threshold is determined;

[0035] If the value F1 of the force sensor 6 falls within the set threshold, it indicates that the force sensor 6 is just in contact with the end of the mandrel 205;

[0036] If the value F1 of the force sensor 6 exceeds the set threshold, the linear module assembly is controlled to move the force sensor 6 a set distance away from the linear motor test fixture 2, wherein the set distance is smaller than the set step size. The value of the force sensor 6 is then read and the relationship between the value of the force sensor 6 and the set threshold is determined again until the value of the force sensor 6 falls within the set threshold.

[0037] Step 4: The coil of the stator 203 is energized and current is input according to the set multiple sets of current values. Each time the current is input, the value of the force sensor 6 is recorded. Finally, the multiple sets of force sensor 6 values ​​obtained are inserted into the specific thrust calculation formula to obtain the specific thrust of the linear motor.

[0038] In the second step, the step distance is set to 0.2 mm-0.5 mm, and more preferably, the step distance is set to 0.2 mm. Furthermore, the value is set to 0.1 N.

[0039] Preferably, in the third step, the distance is set to 0.02 mm and the threshold is set to 0.02N-0.05N.

[0040] It should be noted that the specific steps of the fourth step are to energize the coil of the stator 203 and apply currents of 1A and 2A respectively, and record the values ​​F1 and F2 measured by the force sensor 6 respectively, and then insert F1 and F2 into the specific thrust calculation formula to obtain the specific thrust of the linear motor.

[0041] The specific thrust calculation formula is: Among them, 1, 2 and N are current values, F1, F2 and F N , which are the values ​​measured by the force sensor 6 when the current is 1A, 2A and NA respectively.

[0042] It can be seen that in this embodiment, when using the thrust testing device of the linear motor to perform a relative thrust test on the linear motor, it is only necessary to observe whether the value of the force sensor 6 falls within the set threshold value, which can indicate that the force sensor 6 has just contacted the end of the core shaft 205. There is no need to manually mark the core shaft 205 with a marker pen, and there is no need to observe with the human eye whether the marked part on the core shaft 205 is coplanar with the end face of the test tooling. This can avoid the problem of poor consistency of the test thrust due to artificial visual errors, and reduce the difficulty of subsequent screening of complete machine units.

[0043] Preferably, Figure 2 and Figure 3 As shown, the linear motor test fixture 2 includes a first end cover 201, a second end cover 202, a core shaft 205, a mover 204 and a stator 203, wherein the first end cover 201 and the second end cover 202 have the same structure, and the stator 203 is installed between the first end cover 201 and the second end cover 202. Specifically, Figure 3 From the perspective of , the outer wall of the end stop on the right side of the first end cover 201 is gapped with the inner wall of the left end of the stator 203 and is close to the left end face of the stator 203, and the outer wall of the left end stop of the second end cover 202 is gapped with the inner wall of the right end of the stator 203 and is close to the right end face of the stator 203. A cylindrical cavity is formed between the first end cover 201, the stator 203 and the second end cover 202. The mover 204 is located in the cylindrical cavity, and the mover 204 is coaxially arranged with the stator 203. When the stator 203 is energized, the mover 204 can move along the axis of the cylindrical cavity. A circular hole for the core shaft 205 to pass through is provided at the center of the first end cover 201 and the second end cover 202.

[0044] The core shaft 205 is installed in the stator 203 and is coaxial with the stator 203 . One end of the core shaft 205 passes through the circular hole of the first end cover 201 , and the other end of the core shaft 205 passes through the circular hole of the second end cover 202 .

[0045] It should be noted that when installing the core shaft 205, first insert the core shaft 205 into the center hole of the mover 204, the matching surface of the core shaft 205 is matched with the clearance of the inner hole of the mover 204, the step surface of the core shaft 205 is tightly attached to the step surface of the center hole of the mover 204, and the outside is locked with a locking nut.

[0046] Preferably, in order to reduce the friction between the core shaft 205 and the two end covers and reduce the influence of the friction on the thrust test results of the linear motor, linear motion ball bearings 206 are installed in the circular holes of the first end cover 201 and the second end cover 202 .

[0047] Preferably, Figure 2 and Figure 3As shown, a fixing ring 210 is provided on the outer wall of the first end cover 201 and the second end cover 202. The fixing ring 210 is a circular ring and is coaxially arranged with the end cover. A plurality of U-shaped notches 211 are evenly opened on the fixing ring 210 around its axis.

[0048] In this way, when assembling the linear motor test fixture 2, first assemble the core shaft 205 and the mover 204, then insert the mover 204 into the stator 203, and then put the first end cover 201 on the core shaft 205 from the left end and match with the left end stop of the stator 203, then put the second end cover 202 on the core shaft 205 from the right end and match with the right end stop of the stator 203, finally use the bolt 207 to pass through a U-shaped notch 211 of the first end cover 201, and the bolt 207 passes through the U-shaped notch 211 corresponding to the second end cover 202, and finally use the nut 209 to lock it.

[0049] Optionally, considering that after the first end cover 201 and the second end cover 202 are connected using the bolts 207 and the nuts 209, during subsequent disassembly, the nut 209 is disassembled too slowly, making the disassembly more troublesome.

[0050] Therefore, if Figure 3 As shown, the spring 208 is placed on the bolt 207, and the bolt 207 and the spring 208 are pressed at the U-shaped notch 211 of the first end cover 201, while the bolt 207 passes through the U-shaped notch 211 of the second end cover 202, and then the nut 209 is screwed on the bolt 207 so that the spring 208 has a suitable pre-tightening force. At this time, the nut 209 is welded or bonded to the end of the bolt 207.

[0051] During subsequent disassembly, the bolt 207 is first pushed to compress the spring 208, and the bolt 207 is moved to the right to disengage the nut 209 from the fixing ring 210 of the second end cover 202, and finally the bolt 207 can be directly taken out.

[0052] During subsequent assembly, first, insert the end of the bolt 207 with the spring obliquely into the U-shaped notch 211 of the first end cover 201, then push the bolt 207 to compress the spring 208, and finally insert the end of the bolt 207 with the nut 209 into the U-shaped notch 211 of the second end cover 202. Finally, loosen the bolt 207. Under the resetting action of the spring 208, the end of the bolt 207 with the nut 209 can be tightly against the U-shaped notch 211 of the second end cover 211, which can reduce the time for tightening the screws and greatly improve the assembly efficiency.

[0053] As a preferred embodiment, Figure 1As shown, the lead screw slide assembly includes a housing 1, a lead screw, a stepper motor 4 and a slider 3, wherein the lead screw is rotatably installed inside the housing 1, the output end of the stepper motor 4 is connected to one end of the lead screw, and long strip-shaped through holes are provided on the front and back sides of the housing 1. While the slider 3 is screwed to the lead screw, the ends of the slider 3 extend from the through holes on the front and back sides of the housing 1, and the upper surface of the slider 3 is higher than the upper surface of the housing 1.

[0054] Further, such as Figure 1 A vertically arranged column 5 is installed on the upper surface of the slider 3 , and the column 5 is in the shape of a rectangular plate. A horizontally arranged force sensor 6 is installed on the column 5 , and the force sensor 6 is perpendicular to the column 5 .

[0055] Preferably, Figure 1 and Figure 4 As shown, a support base is installed on the housing 1, and the support base is used to install the linear motor test fixture 2. Specifically, the support base includes two support plates 8, the bottom of the support plate 8 is in an inverted U shape, which is convenient for crossing the housing 1, and the support plate 8 is provided with an arc groove near the top, and the arc groove is used to place the linear motor test fixture 2. A plurality of screw holes for installing ball spring screws 9 are opened on the support plate 8 near the force sensor 6.

[0056] Further, such as Figure 1 As shown, only the left support plate 8 is installed with the ball-end spring screw 9, and the ball of the ball-end spring screw 9 exceeds the right end surface of the left support plate 8, so that the ball-end spring screw 9 will be compressed when the linear motor test fixture 2 is placed in, so that the linear motor test fixture 2 is pressed to the right, ensuring that the linear motor test fixture 2 will not be displaced during the test, and the subsequent disassembly of the linear motor test fixture 2 is also very convenient.

[0057] When installing the linear motor test fixture 2 onto the support seat, Figure 3 As shown, first place the linear motor test fixture 2 horizontally on the two support plates 8, and the left support plate 8 compresses the ball spring screw 9, and the ball spring screw 9 gives the linear motor test fixture 2 a rightward force, so that the linear motor test fixture 2 is fastened between the two support plates 8. Due to the pre-tightening of the ball spring screw 9, the linear motor test fixture 2 will not move left and right, and the ball spring screw 9 does not need to be tightened every time, and it does not need to be adjusted again after adjusting it once. In this way, the linear motor test fixture 2 can be firmly fixed on the support seat, the linear motor test fixture 2 will not shake, and it is also very convenient to disassemble the linear motor test fixture 2 later.

[0058] It should be noted that the distance between the left side surface of the fixing ring 210 of the first end cover 201 in the linear motor test fixture 2 and the right side surface of the fixing ring 210 on the second end cover 202 is slightly smaller than the distance between the two support plates 8. In this way, when the linear motor test fixture 2 is placed between the two support plates 8, the right fixing ring 210 in the linear motor test fixture 2 is tightly attached to the inner side surface of the right support plate 8.

[0059] In addition, the thrust testing device of the linear motor also includes a DC power supply, a stepper motor driver, a data acquisition card and a computer, wherein the DC power supply is connected to the coil on the stator 203, the driver of the stepper motor 4 is connected to the computer signal, and the computer is used to control the operation of the stepper motor 4. In addition, the force sensor 6 is connected to the data acquisition card, the data acquisition card communicates with the computer, and the data measured by the force sensor 6 is transmitted to the computer in real time and displayed on the display screen.

[0060] When the thrust test device of the linear motor is used to test the thrust of the linear motor, its specific working principle is as follows:

[0061] The first step is to assemble the linear motor test fixture 2, and then place the linear motor test fixture 2 horizontally on two support plates 8, and gently press it into the support plates 8.

[0062] In the second step, the computer drives the stepper motor 4 according to the set program so that the slider 3 moves with the force sensor 6 toward the linear motor test fixture 2. When the force sensor 6 moves to the end close to the core shaft 205, the computer controls the stepper motor 4 to pause.

[0063] In the third step, the stepper motor 4 drives the lead screw to rotate according to the instruction issued by the computer, and the force sensor 6 moves 0.2mm toward the linear motor test fixture 2. The controller reads the value F of the force sensor 6 in real time, and determines the relationship between the value F of the force sensor 6 and the set value, where the set value is 0.1N.

[0064] If the value F of the force sensor 6 is less than 0.1N, the stepper motor 4 drives the screw with the force sensor 6 to move 0.2mm toward the linear motor test fixture 2 again according to the instruction issued by the controller, and makes another judgment until the value F of the force sensor 6 is greater than or equal to 0.1N.

[0065] Step 4: When the stepper motor 4 drives the lead screw with the force sensor 6 to move 0.02 mm away from the linear motor test fixture 2 according to the instruction issued by the computer, the computer reads the value F1 of the force sensor 6 and determines the relationship between the value F1 of the force sensor 6 and the set threshold, where the set threshold is 0.02N-0.05N.

[0066] If the value F1 of the force sensor 6 falls within the set threshold, it indicates that the force sensor 6 is just in contact with the end of the mandrel 205;

[0067] If the value F1 of the force sensor 6 exceeds the set threshold, the stepper motor 4 drives the screw force sensor 6 to move another 0.02 mm in the direction away from the linear motor test fixture 2 according to the instructions issued by the controller. Then the controller reads the value of the force sensor 6 and again determines the relationship between the value of the force sensor 6 and the set threshold until the value of the force sensor 6 falls into the set threshold.

[0068] In the fifth step, the coil of the stator 203 is energized and currents of 1A and 2A are applied respectively, and the values ​​F1 and F2 measured by the force sensor 6 are recorded respectively. Then, F1 and F2 are inserted into the specific thrust calculation formula to obtain the specific thrust of the linear motor.

[0069] Preferably, Figure 1 As shown, a displacement sensor is installed on the top of the slider 3, and a displacement sensor is also installed on the right side of the housing 1. Both displacement sensors are laser displacement sensors. For the convenience of distinction, the laser displacement sensor installed on the slider 3 is named the second laser displacement sensor 10, and the laser displacement sensor set on the right side of the support seat is named the first laser displacement sensor 7. The height of the test light of the first laser displacement sensor 7 is the same as the height of the core shaft 205, and is reflected at the right end of the core shaft 205. The first laser displacement sensor 7 is used to measure the distance between the end face of the core shaft 205 close to the first laser displacement sensor 7 and the first laser displacement sensor 7.

[0070] It should be noted that, since the distance between the left end face of the core shaft 205 of the linear motor and the left end face of the left support plate is fixed, and the horizontal distance between the right end face of the force sensor 6 and the second laser displacement sensor 10 is also fixed, the force sensor 6 can be quickly moved to the left end of the core shaft 205 when used together with the second laser displacement sensor 10.

[0071] It should be noted that the method of using the thrust testing device of the linear motor to test the thrust of the linear motor also includes two other methods.

[0072] The first test method specifically includes: the first step is to install the linear motor test fixture 2 on the support seat to ensure that the core shaft 205 of the linear motor test fixture 2 is in a horizontal state;

[0073] Step 2: Use the first laser displacement sensor 7 to measure the distance between the end of the core shaft 205 close to the first laser displacement sensor 7 and the first laser displacement sensor 7, and the distance is recorded as D0;

[0074] Step 3: During the first operation, the controller drives the stepper motor 4 according to the set program so that the slider 3 moves the force sensor 6 toward the linear motor test fixture 2. When the distance between the force sensor 6 and the mandrel 205 falls into the set range, the controller controls the stepper motor 4 to pause, wherein the set range is 0.5mm-1mm. This process is used together with the second laser displacement sensor 10 to quickly move the force sensor 6 to 0.5mm-1mm near the left end of the mandrel 205.

[0075] Step 4: A forward current of 0.3 A is passed through the linear motor, so that the core shaft 205 moves toward the direction approaching the force sensor 6 and contacts the force sensor 6 .

[0076] Step 5: Use the first laser displacement sensor 7 to measure the distance between the end of the core shaft 205 close to the first laser displacement sensor 7 and the first laser displacement sensor 7, and the distance is recorded as D1;

[0077] Step 6: The controller drives the stepper motor 4 according to the set program so that the slider 3 and the force sensor 6 move toward the linear motor test fixture 2 by a distance |D1-D0|.

[0078] Step 7: The DC power supply inputs current according to the set multiple sets of current values. Each time the current is input, the value of the force sensor 6 is recorded. Finally, the multiple sets of force sensor 6 values ​​obtained are inserted into the specific thrust calculation formula to obtain the specific thrust of the linear motor.

[0079] Step 8: The motor is powered off, and the computer controls the force sensor 6 to move backward by 1 mm. Disassemble the linear motor test fixture 2. Repeat the first step, the second step, and the fourth step to the eighth step to test the next motor.

[0080] The second test method specifically includes: the first step: installing the linear motor test fixture 2 on the support seat of the linear motor thrust test system, ensuring that the core shaft 205 of the linear motor test fixture 2 is in a horizontal state;

[0081] Step 2: Use the first laser displacement sensor 7 to measure the distance between the end of the core shaft 205 close to the first laser displacement sensor 7 and the first laser displacement sensor 7, and the distance is recorded as D0;

[0082] Step 3: During the first test, the controller drives the stepper motor 4 according to the set program so that the slider 3 and the force sensor 6 move toward the linear motor test fixture 2. When the force sensor 6 moves to the end close to the mandrel 205, the controller controls the stepper motor 4 to pause. For example, the force sensor 6 stops when it moves to 5 mm from the left end face of the mandrel 205.

[0083] Then the controller drives the stepper motor 4 according to the set program so that the slider 3 and the power sensor 6 move toward the linear motor test fixture 2 according to the set step distance, and the first laser displacement sensor 7 is used to measure the distance between the end of the core shaft 205 close to the first laser displacement sensor 7 and the first laser displacement sensor 7, and the distance is recorded as D1, and the relationship between |D1-D0| and the set distance is determined;

[0084] If |D1-D0| is greater than or equal to the set distance, the contact condition is met;

[0085] If |D1-D0| is less than the set distance, repeat the third step until the contact condition is met. The set step size is 1.2mm and the set distance is 0.5mm.

[0086] Step 4: When the contact condition is met, the controller drives the stepper motor 4 according to the set program so that the slider 3 moves the force sensor 6 away from the linear motor test fixture 2 by a distance of |D1-D0|, and the mover 204 automatically drives the core shaft 205 to return to a balanced state under the action of the self-positioning force.

[0087] It should be noted that when the force sensor 6 moves a distance |D1-D0| in the direction away from the linear motor test fixture 2, the force sensor 6 is no longer in contact with the end of the core shaft 205. However, since the mover 204 in the linear motor can automatically drive the core shaft 205 to return to a balanced state under the action of the self-positioning force, the core shaft 205 will move a distance |D1-D0| in the direction close to the force sensor 6 and thus contact the force sensor 6.

[0088] Step 5: The stator 203 coil is energized and current is input according to the set multiple sets of current values. Each time the current is input, the value of the force sensor 6 is recorded. Finally, the multiple sets of force sensor 6 values ​​obtained are inserted into the specific thrust calculation formula to obtain the specific thrust of the linear motor.

[0089] Step 6: The motor is powered off, and the computer controls the force sensor 6 to move backward by 1 mm. Disassemble the linear motor test fixture 2. Repeat steps 1 to 6 to test the next motor.

[0090] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0091] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thrust test device for a linear motor, characterized in that: It includes a linear module assembly, a linear motor test fixture (2), a power supply assembly and a force sensor (6); The linear motor test fixture (2) is mounted on the linear module assembly so that the core shaft (205) in the linear motor test fixture (2) is in a horizontal state; The power supply assembly is used to input current to the stator coil in the linear motor test fixture (2); The linear module assembly includes a slider (3), the force sensor (6) is mounted on the slider (3), the slider (3) is used to drive the force sensor (6) to approach or move away from the core shaft (205), and the axis of the force sensor (6) is colinear with the axis of the core shaft (205).

2. A linear motor thrust test device according to claim 1, characterized in that: The thrust test device for the linear motor also includes at least one displacement sensor, which is mounted on the linear module assembly and arranged on a side of the linear motor test fixture (2) away from the force sensor (6), and is used to measure the distance between the end face of the core shaft (205) close to the displacement sensor and the displacement sensor.

3. A linear motor thrust test device according to claim 2, characterized in that: Two displacement sensors are provided, one of which is provided on a side of the linear motor test fixture (2) away from the force sensor (6), and the other of which is installed on the slider (3).

4. A linear motor thrust test device according to claim 3, characterized in that: The thrust test device of the linear motor comprises a support seat, the support seat is mounted on the linear module assembly, the support seat comprises two support plates (8), and the linear motor test fixture (2) is detachably mounted between the two support plates (8).

5. A linear motor thrust test device according to claim 4, characterized in that: The top of the support plate (8) has an arc groove matching the linear motor test fixture (2), and a screw hole is opened on the support plate (8) close to the force sensor (6), and a ball spring screw (9) is installed in the screw hole.

6. The thrust test device of a linear motor according to claim 1, characterized in that: The linear motor test fixture (2) comprises a first end cover (201), a second end cover (202), a core shaft (205), a mover (204) and a stator (203); the stator (203) is installed between the first end cover (201) and the second end cover (202); a sealed cavity is formed between the first end cover (201), the stator (203) and the second end cover (202); the mover (204) is coaxially arranged with the stator (203), and the mover (204) is located in the cavity; the core shaft (205) is coaxially installed on the mover (204), and two ends of the core shaft (205) respectively pass through the first end cover (201) and the second end cover (202).

7. A linear motor thrust test device according to claim 6, characterized in that: The linear motor test fixture (2) comprises at least one bolt (207); a fixing ring (210) is provided on the side of each of the first end cover (201) and the second end cover (202); a plurality of U-shaped notches (211) are evenly provided on the fixing ring (210) around its axis; the U-shaped notches (211) on the first end cover (201) correspond to the U-shaped notches (211) on the second end cover (202) in a one-to-one manner; the bolt (207) passes through one of the U-shaped notches (211) on the first end cover (201) and exits from one of the U-shaped notches (211) on the second end cover (202); and a nut (209) is installed at the end of the bolt (207).

8. The thrust test device of a linear motor according to claim 6, characterized in that: The first end cover (201) and the second end cover (202) are respectively provided with mounting holes at their centers, and linear motion ball bearings (206) are provided in the mounting holes.

9. The thrust test device of a linear motor according to claim 1, characterized in that: A vertically arranged column (5) is provided on the top of the sliding block (3), and the force sensor (6) is detachably mounted on the column (5), and the force sensor (6) is perpendicular to the column (5).

10. A linear motor thrust test device according to any one of claims 1 to 9, characterized in that: The linear module assembly comprises a housing (1), a stepper motor (4) and a lead screw, wherein the lead screw is rotatably mounted in the housing (1), an output end of the stepper motor (4) is connected to one end of the lead screw, the slider (3) is slidably mounted in the housing (1) and the lead screw is threadedly connected.

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