Motor torque measuring device

Abstract

The utility model relates to a motor torque measuring device. The motor torque measuring device comprises a fixing jig, a loading module and a control module, the fixing jig is provided with a limiting groove used for containing a motor to be measured, the central axis of the limiting groove extends in the first horizontal direction, and the loading module comprises a driving source and a load assembly. The driving source is arranged beside the fixing jig in the second horizontal direction perpendicular to the first horizontal direction, the load assembly is connected to the driving source, and the control module is in communication connection with the load assembly and can obtain the torque of the to-be-tested motor based on the load force value applied by the load assembly in the second horizontal direction. The load value can be changed only by changing the output speed of the driving source, so that a weight does not need to be used for applying a load, the weight does not need to be frequently replaced, the operation is simple, the operation time can be shortened, and the measurement efficiency can be greatly improved.

Description

Technical Field

[0001] This application relates to the field of motor testing technology, and in particular to a motor torque measuring device. Background Technology

[0002] As an energy conversion device, electric motors are ubiquitous in various 3C products (i.e., products in the fields of computers, communications, and consumer electronics). To ensure the quality of products entering the market, their performance needs to be tested before they leave the factory. The most important aspect of this testing is measuring various performance parameters of the motor (such as torque, maximum starting speed, inductance, resistance, and temperature).

[0003] Currently, most 3C products are trending towards miniaturization and intelligence. Consequently, many 3C products also use micro stepper motors. When testing these motors, such as measuring their torque, the traditional method involves applying a load by suspending weights with a brake cable. Since the load needs to be frequently changed, the weights need to be manually added or removed frequently, resulting in low measurement efficiency. Furthermore, due to the small size of micro stepper motors and the small diameter and length of their output shafts, it is inconvenient to directly install torque sensors on them for measurement. Therefore, a new torque measurement device is needed to measure the torque of motors, especially micro motors. Utility Model Content

[0004] Therefore, it is necessary to provide a motor torque measurement device that can solve the technical problem that existing traditional motor torque measurement methods are inconvenient for measuring the torque of motors, especially micro motors.

[0005] According to one aspect of this application, a motor torque measuring device is provided, comprising:

[0006] A fixing fixture for fixing a motor under test, the fixing fixture having a limiting groove for accommodating the motor under test, the central axis of the limiting groove extending along a first horizontal direction;

[0007] The loading module includes a drive source and a load component. The load component is used to connect to the output shaft of the motor under test. The drive source is located next to the fixing fixture in a second horizontal direction perpendicular to the first horizontal direction, and the drive source is connected to the load component. The drive source can drive the load component to apply a load to the motor under test along the second horizontal direction.

[0008] The control module is communicatively connected to the load component, and the control module is able to obtain the torque of the motor under test based on the load force applied by the load component along the second horizontal direction.

[0009] In one embodiment, there are two drive sources, which are respectively disposed on both sides of the fixing fixture in the second horizontal direction. The load component is connected to one of the drive sources at opposite ends along the second horizontal direction. The two drive sources can drive the load component to apply load to the motor under test simultaneously in two opposite directions in the second horizontal direction, so that the control module obtains the torque of the motor under test based on the difference of the load force applied by the load component in the two opposite directions in the second horizontal direction.

[0010] In one embodiment, the load assembly includes a brake cable and a tension / compression sensor. The brake cable is used to connect to the output shaft of the motor under test, and the brake cable is connected to the tension / compression sensor, which is connected to the drive source.

[0011] In one embodiment, the load assembly further includes a coupling for coaxial connection with the output shaft of the motor under test, and the brake cable is wound around the coupling.

[0012] In one embodiment, the brake line is connected to the tension / compression sensor via a first elastic element.

[0013] In one embodiment, the fixing fixture is connected to a first position adjustment mechanism, which is used to adjust the height position of the fixing fixture;

[0014] And / or, the drive source is connected to a second position adjustment mechanism, which is used to adjust the position of the drive source along the first horizontal direction.

[0015] In one embodiment, the motor torque measuring device further includes a bracket with a pressure display gauge communicatively connected to the load assembly; the bracket has a horizontal bearing surface, and the loading module and the fixing fixture are disposed on the bearing surface.

[0016] In one embodiment, the motor torque measuring device further includes a chassis, the bracket is mounted on the chassis, and the control module is mounted inside the chassis.

[0017] In one embodiment, the fixing fixture includes:

[0018] Base;

[0019] A fixing seat is disposed on the base, and the fixing seat has an upward-facing first limiting groove;

[0020] A cover plate is movably connected to the base to cover or open the fixed seat. The cover plate has a second limiting groove. When the cover plate covers the fixed seat, the openings of the first limiting groove and the second limiting groove are vertically opposite each other, and the first limiting groove and the second limiting groove together form the limiting groove.

[0021] In one embodiment, the cover plate is movably connected to the base by a second elastic member, and the fixing seat is movably provided with a buckle for engaging with the cover plate when the cover plate closes the fixing seat. The second elastic member is configured to provide the elastic force required to switch the cover plate from a state of closing the base to a state of opening the base when the buckle disengages from the cover plate.

[0022] The aforementioned motor torque measuring device, by setting a drive source in the loading module, with the drive source positioned next to the fixed fixture in the second horizontal direction and the load component connected to the drive source, enables the drive source to drive the load component to apply a load to the motor under test along the second horizontal direction. Furthermore, the control module can obtain the torque of the motor under test based on the load force applied by the load component along the second horizontal direction. Thus, simply changing the output speed of the drive source changes the load value, eliminating the need for applying weights and frequent weight replacements. This allows operators to conveniently measure the torque of the motor under test using the aforementioned motor torque measuring device. It is not only simple to operate but also reduces operation time, enabling batch automatic measurement of the torque of motors, especially micro motors, and greatly improving measurement efficiency. Attached Figure Description

[0023] Figure 1 This is an axonal view of a motor torque measuring device provided in an embodiment of this application.

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of region A in the middle.

[0025] Figure 3 A shaft-side view of a motor torque measuring device provided in another embodiment of this application.

[0026] Figure 4 This is an axonometric view of the cover plate of the fixing fixture in an embodiment of the present application when it is in the closed state.

[0027] Figure 5 This is an axonometric view of the cover plate of the fixing fixture in an embodiment of the motor torque measuring device provided in this application when it is in the open state.

[0028] Figure 6 This is a torque-frequency curve diagram of a stepper motor.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10. Motor torque measuring device; 100. Fixture; 101. Limiting groove; 110. Base; 120. Fixing seat; 121. First limiting groove; 130. Cover plate; 131. Second limiting groove; 140. Buckle; 150. Second elastic element; 160. Rear baffle; 170. Third elastic element; 200. Loading module; 210. Drive source; 211. Fixing part; 212. Output part; 220. Load assembly; 221. Coupling wheel; 222. Brake cable; 223. Tension / compression sensor; 224. First elastic element; 300. First position adjustment mechanism; 400. Second position adjustment mechanism; 500. Pressure display gauge; 600. Bracket; 700. Chassis. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] As described in the background section, motors, as energy conversion devices, are ubiquitous in various 3C products. To ensure the quality of products entering the market, their performance needs to be measured before they leave the factory. The most important aspect of this measurement is the measurement of various performance parameters of the motor (such as torque, maximum starting speed, inductance, resistance, and temperature). Currently, most 3C products are trending towards miniaturization and intelligence, and therefore, many 3C products use micro stepper motors. When measuring these motors, such as torque, the traditional method involves applying a load by suspending weights with a brake cable. Because the load needs frequent adjustment, this requires manual addition or removal of weights, resulting in low measurement efficiency. Furthermore, micro stepper motors are small in size, with small output shaft diameters and lengths. Not only are there no suitable small-size torque sensors for direct torque measurement, but even if such sensors existed, it would be inconvenient to directly install them on the micro stepper motor for measurement.

[0038] Therefore, this application provides a motor torque measuring device that can simply, directly, accurately and scientifically measure and obtain the torque parameters of the motor under test, especially the micro stepper motor.

[0039] The structure of the motor torque measuring device in this application will be described below using the example of measuring the torque of a micro stepper motor. It is understood that in other embodiments, the motor torque measuring device and motor measuring method of this application are not limited to measuring the torque of a micro stepper motor, but can also be used to measure the torque of any motor; this is not limited here.

[0040] See Figure 1 , Figure 1 A schematic diagram of a motor torque measuring device 10 according to an embodiment of this application is shown. The motor torque measuring device 10 provided in an embodiment of this application includes a fixing fixture 100, a loading module 200 and a control module (not shown in the figure). The fixing fixture 100 is used to fix the motor under test, the loading module 200 is used to apply a load to the motor under test, and the control module is used to control the start and stop and speed change of the motor under test, and to obtain the torque parameters of the motor under test based on the load force applied to the motor under test by the loading module 200.

[0041] Specifically, in one embodiment, the fixing fixture 100 has a limiting groove 101 for accommodating the motor under test (see...). Figure 4At least a portion of the motor under test can be confined in the limiting groove 101, the central axis of which extends along a first horizontal direction (the X direction shown in the figure). The loading module 200 includes a drive source 210 and a load component 220. The control module is communicatively connected to the load component 220. The drive source 210 can drive the load component 220 to apply a load to the motor under test, and the control module can obtain the torque of the motor under test based on the load force applied to the motor under test by the load component 220.

[0042] Furthermore, such as Figure 1 As shown, there are two drive sources 210. The two drive sources 210 are respectively disposed on both sides of the fixed fixture 100 along a second horizontal direction (Y direction shown in the figure) perpendicular to the first horizontal direction. The two drive sources 210 can drive the load component 220 to apply load to the motor under test simultaneously in two opposite directions in the second horizontal direction, so that the control module can obtain the torque of the motor under test based on the difference of the load force values ​​applied by the load component 220 in the two opposite directions in the second horizontal direction.

[0043] It is understandable that there can be only one drive source 210. When there is only one drive source 210, the drive source 210 is located next to the fixed fixture in the second horizontal direction. At this time, the drive source 210 drives the load assembly 220 to apply a load force to the motor under test in one direction of the second horizontal direction.

[0044] More specifically, in the structure of load component 220, in one embodiment, as... Figure 2 As shown, the load assembly 220 includes a coupling wheel 221, a brake cable 222, and two tension / compression sensors 223. The coupling wheel 221 is used to be coaxially and fixedly connected to the output shaft of the motor under test. The brake cable 222 is wound around the coupling wheel 221, and a tension / compression sensor 223 is connected to each of the opposite ends of the brake cable 222 along the second horizontal direction. Each tension / compression sensor 223 is connected to a drive source 210, and each tension / compression sensor 223 is communicatively connected to the control module.

[0045] Alternatively, please continue reading Figure 1 The drive source 210 is a linear motor, which includes a fixed part 211 and an output part 212. The output part 212 can move linearly relative to the fixed part 211 in a second horizontal direction under the drive of the fixed part 211. The tension and compression sensor 223 is mounted on the output part 212. The output part 212 and the tension and compression sensor 223 can move linearly together relative to the fixed part 211 in a second horizontal direction.

[0046] Thus, combined Figure 1 and Figure 2As shown, the two ends of the brake line 222 are respectively connected to a drive source 210 through a tension sensor 223. The two drive sources 210 can simultaneously pull the opposite ends of the brake line 222 to apply tension to the output shaft of the motor under test in two opposite directions along the second horizontal direction. The tension sensor 223 located at the corresponding end of the brake line 222 can measure the tension value applied by the brake line 222 to the output shaft of the motor under test when the drive source 210 pulls the brake line 222. The difference in tension applied at the two ends of the brake line 222 is the load force applied to the motor under test. The control module can calculate the torque value of the motor under test based on the formula (F1-F2)×(D1+D2) / 2.

[0047] Wherein: F1 is the tension applied to one end of the brake line 222, F2 is the tension applied to the other end of the brake line 222, D1 is the diameter of the coupling wheel 221, and D2 is the diameter of the brake line 222.

[0048] Of course, it is understandable that in some other embodiments, the load component 220 may not have the coupling wheel 221, and the brake line 222 may be directly wound around the output shaft of the device under test. However, it is obvious that when the device under test is a micro motor, since the output shaft diameter of the micro motor is small, only about 8mm, it is not convenient to wind the brake line 222 directly around the output shaft. Therefore, setting the coupling wheel 221 makes it easier to wind the brake line 222, which is obviously a better embodiment.

[0049] As can be seen, by setting two drive sources 210 to drive the load component 220 to simultaneously apply load to the motor under test in two opposite directions in the second horizontal direction, the load value can be changed simply by changing the output speed of the drive source 210. Therefore, it is not necessary to use weights to apply the load, nor is it necessary to frequently change the weights. This allows the operator to conveniently measure the torque of the motor under test using the motor torque measuring device 10. Not only is the operation simple, but the operation time can also be reduced. It can realize batch automatic measurement of the torque of motors, especially micro motors, and greatly improve the measurement efficiency.

[0050] It is worth noting that when both drive sources 210 simultaneously pull the brake cable 222, the brake cable 222 will become taut, making it inconvenient to disassemble the brake cable 222 when replacing it. To solve this problem, in a preferred embodiment, such as... Figure 1As shown, the two ends of the brake line 222 are respectively connected to a first elastic element 224. For example, the first elastic element 224 can be a spring or a tension spring, so that the two ends of the brake line 222 are respectively connected to the tension sensor 223 through the first elastic element 224. By setting the first elastic element 224, even when the brake line 222 is taut, the first elastic element 224 can be compressed and elastically deformed, so the brake line 222 can be easily disassembled.

[0051] Furthermore, to improve measurement accuracy, the tension applied at both ends of the brake line 222 must be perpendicular to the central axis of the motor output shaft. To achieve this, the fixture 100 is connected to a first position adjustment mechanism 300, which adjusts the height of the fixture 100 in the vertical direction (Z direction shown in the figure), thereby adjusting the coupling wheel 221 to be at the same height as the two drive sources 210. At this time, when viewed from a direction perpendicular to the paper, the brake line 222 is also horizontally positioned. Optionally, each drive source 210 is also connected to a second position adjustment mechanism 400, which adjusts the position of the drive source 210 along the first horizontal direction, so that when viewed from above, the two drive sources 210 and the coupling wheel 221 are aligned on the same straight line in the second horizontal direction.

[0052] Thus, through the above settings, it can be ensured that the direction of the tension applied at both ends of the brake cable 222 is perpendicular to the central axis of the motor output shaft, thereby ensuring that the tension measured by the tension sensor 223 is the actual tension fully applied to the motor output shaft. Of course, only the first position adjustment mechanism 300 or only the second position adjustment mechanism 400 can be set, but setting both the first position adjustment mechanism 300 and the second position adjustment mechanism 400 is obviously the best embodiment.

[0053] It should be noted that the structure of the load assembly 220 is not limited to the structure of the coupling wheel 221 and the brake line 222. It can also be other structures, such as the structure of the coupling wheel 221 and the brake block, as long as the load can be applied to the output shaft of the motor so that the output shaft of the motor can be resisted when rotating. There is no limitation here.

[0054] Furthermore, in order to enable the operator to intuitively understand the magnitude of the load value, the motor torque measuring device 10 provided in this application also includes a pressure display 500 that is communicatively connected to the tension / compression sensor 223. In order to provide a suitable position for the pressure display 500, the motor torque measuring device 10 also includes a bracket 600, on which the pressure display 500 is mounted. The bracket 600 has a horizontal bearing surface, and the drive source 210 and the fixing fixture 100 are both mounted on the bearing surface, thereby making the overall structure of the motor torque measuring device more compact.

[0055] And further still, such as Figure 3 As shown, a chassis 700 can also be provided, with the control module housed inside the chassis 700 and the bracket 600 mounted on the chassis 700. In this way, the chassis 700, the bracket 600, the fixing fixture 100 mounted on the frame, and the loading module 200 are stacked vertically, which can make full use of the vertical space and further increase the overall structural compactness of the motor torque measuring device.

[0056] Additionally, regarding the structure of the fixing fixture 100, please refer to... Figure 4 and Figure 5 In one embodiment, the fixing fixture 100 includes a base 110, a fixing seat 120, and a cover plate 130. The fixing seat 120 is disposed on the base 110 and has an upward-facing first limiting groove 121. The cover plate 130 is movably connected to the fixing seat 120, for example, rotatably connected to the fixing seat 120, so as to close or open the fixing seat 120. The cover plate 130 has a second limiting groove 131. When the cover plate 130 closes to the fixing seat 120, the opening of the first limiting groove 121 and the opening of the second limiting groove 131 are vertically opposite to each other, so that the first limiting groove 121 and the second limiting groove 131 together form a limiting groove 101. When the motor under test is limited in the limiting groove 101, the degree of freedom of the motor under test in the vertical direction is restricted. In the embodiment shown in the figure, both the first limiting groove 121 and the second limiting groove 131 are V-shaped grooves, that is, the openings of the first limiting groove 121 and the second limiting groove 131 are both V-shaped openings. By designing them as V-shaped grooves, the cylindrical motor under test can be fixed better, and the motor can be prevented from slipping.

[0057] When the cover plate 130 is closed on the fixing base 120, in order to prevent the cover plate 130 from opening automatically, the fixing base 120 is movably provided with a buckle 140. The buckle 140 is used to engage with the cover plate 130 when the cover plate 130 is closed on the fixing base 120, thereby fixing the cover plate 130 and preventing the cover plate 130 from moving relative to the fixing base 120. Preferably, the cover plate 130 is movably connected to the base 110 through a second elastic member 150. The second elastic member 150 can be a torsion spring, a tension spring, etc., and its function is to provide the elastic force required to switch the cover plate 130 from the state of closing the base 110 to the state of opening the base 110 when the buckle 140 is disengaged from the cover plate 130. Thus, when it is necessary to open the fixed seat 120, the operator only needs to press the buckle 140 to make the buckle 140 rotate and disengage from the cover plate 130. The cover plate 130 can then automatically spring up under the elastic force provided by the second elastic element 150 to open the fixed seat 120.

[0058] In a preferred embodiment, such as Figure 5As shown, the fixing fixture 100 also includes a rear baffle 160, which is disposed adjacent to the fixing seat 120 in the first horizontal direction, and the rear baffle 160 is movably connected to the base 110 via a third elastic member 170. The purpose of setting the rear baffle 160 is to limit the motor under test in the first horizontal direction together with the fixing seat 120. When the motor under test is accommodated in the limiting groove 101, it can prevent the motor under test from moving in the first horizontal direction. The third elastic member 170 is used to provide an elastic force to reset the rear baffle 160 and move it closer to the fixing seat 120 when the rear baffle 160 moves away from the fixing seat 120. The elastic force provided by the third elastic member 170 can clamp the limiting seat together with the fixing seat 120 to achieve a better fixing effect.

[0059] The following section will take a micro stepper motor as an example to describe the steps for measuring the pull-in torque and pull-out torque of a stepper motor using the motor torque measuring device 10 described in the above embodiment.

[0060] like Figure 6 The figure shown is a torque-frequency curve of a stepper motor. Figure 6 The horizontal axis represents the frequency of the motor drive pulses, and the vertical axis represents the torque value of the motor at that frequency. The torque value includes the pull-in torque value and the pull-out torque value. The pull-in torque is defined as the acceleration torque that the stepper motor can provide to ensure starting at a given step frequency without losing steps, while overcoming rotor inertia, load and friction. The pull-out torque is defined as the maximum torque that the shaft end can provide when the stepper motor can run continuously at a constant speed without losing steps. Figure 6 In the diagram, the pull-in torque values ​​at different frequencies are connected together to form the pull-in torque curve, while the pull-out torque values ​​at different frequencies are connected together to form the pull-out torque curve. The left side of the pull-in torque curve represents the self-starting region. When the torque value corresponding to the motor's frequency is within this region, the motor can start, stop, and reverse directly without worrying about losing steps. Between the pull-in and pull-out torque curves lies the stepper motor's continuous operation region under load. Within this region, the motor can also run continuously without losing steps. However, if the load or step frequency increases further, the stepper motor will be unable to provide the corresponding torque and will enter the step-out region. This is because at higher step frequencies or heavier loads, the actual rotation frequency of the stepper motor rotor cannot keep up with the frequency of the stator magnetic field changes. If the load is further increased at this time, in severe cases, it will cause the rotor to stall.

[0061] It can be seen that among the performance parameters of a stepper motor, pull-in torque and pull-out torque are very important mechanical performance parameters. By measuring the pull-in torque and pull-out torque and plotting the torque-frequency curve based on the measured values, it is helpful to understand the characteristics of the stepper motor itself, so as to better select the appropriate motor for the product.

[0062] During measurement, the pull-out torque of the motor can be measured first at a lower frequency, and then the pull-in torque of the motor can be measured at the same frequency. Specifically, based on the definitions of pull-in torque and pull-out torque, when measuring the pull-out torque, the motor is first accelerated to the measurement frequency, the output part 212 of the drive source 210 moves away from the motor under test along the second horizontal direction, the brake cable 222 is tightened, and the load gradually increases. When the load reaches a certain value, the output shaft of the motor is locked and cannot rotate. At this time, the motor is in a stepless state, and the torque value measured before the motor loses its steps is the pull-out torque.

[0063] When measuring the pull-in torque, gradually reduce the load applied to the motor under test, check whether the motor under test can restart from the holding state without losing steps, and adjust the load size (increase or decrease the load) according to the result. Repeat this process until the maximum load torque when the motor rotates synchronously is determined. This load torque is the pull-in torque.

[0064] After completing the pull-out and pull-in torque measurements at the first frequency, repeat the above steps at the next higher frequency to measure the pull-in and pull-out torque, thereby finally obtaining the complete torque-frequency curve of the motor under test.

[0065] Therefore, when measuring the torque of the motor under test using the motor torque measuring device provided in this application, compared with the traditional measurement method that requires the use of steel wire ropes to suspend weights for measurement, the degree of automation is higher and the measurement results are more accurate. Furthermore, when the load needs to be changed, there is no need to replace the weights, thus improving measurement efficiency. This is especially convenient for measuring micro motors, overcoming the problem of the lack of corresponding small-scale torque sensors for measuring the torque of micro motors.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A motor torque measuring device, characterized in that, include: A fixing fixture (100) is used to fix the motor under test. The fixing fixture (100) has a limiting groove (101) for accommodating the motor under test. The central axis of the limiting groove (101) extends along a first horizontal direction. The loading module (200) includes a drive source (210) and a load component (220). The load component (220) is used to connect to the output shaft of the motor under test. The drive source (210) is disposed next to the fixing fixture (100) in a second horizontal direction perpendicular to the first horizontal direction, and the drive source (210) is connected to the load component (220). The drive source (210) can drive the load component (220) to apply a load to the motor under test along the second horizontal direction. The control module is communicatively connected to the load component (220), and the control module is able to obtain the torque of the motor under test based on the load force applied by the load component (220) along the second horizontal direction.

2. The motor torque measuring device according to claim 1, characterized in that, There are two drive sources (210), which are respectively disposed on both sides of the fixing fixture (100) in the second horizontal direction. The load assembly (220) is connected to one of the drive sources (210) at opposite ends along the second horizontal direction. The two drive sources (210) can drive the load assembly (220) to apply load to the motor under test simultaneously in two opposite directions in the second horizontal direction, so that the control module obtains the torque of the motor under test based on the difference of the load force applied by the load assembly (220) in the two opposite directions in the second horizontal direction.

3. The motor torque measuring device according to claim 1, characterized in that, The load assembly (220) includes a brake line (222) and a tension / compression sensor (223). The brake line (222) is used to connect to the output shaft of the motor under test, and the brake line (222) is connected to the tension / compression sensor (223), which is connected to the drive source (210).

4. The motor torque measuring device according to claim 3, characterized in that, The load assembly (220) also includes a coupling wheel (221) for coaxial connection with the output shaft of the motor under test, and the brake line (222) is wound around the coupling wheel (221).

5. The motor torque measuring device according to claim 3 or 4, characterized in that, The brake line (222) is connected to the tension / compression sensor (223) via the first elastic element (224).

6. The motor torque measuring device according to claim 1, characterized in that, The fixing fixture (100) is connected to a first position adjustment mechanism (300), which is used to adjust the height position of the fixing fixture (100); And / or, the drive source (210) is connected to a second position adjustment mechanism (400), which is used to adjust the position of the drive source (210) along the first horizontal direction.

7. The motor torque measuring device according to claim 1, characterized in that, The motor torque measuring device (10) further includes a bracket (600), on which a pressure display gauge (500) is provided, and the pressure display gauge (500) is communicatively connected to the load assembly (220); the bracket (600) has a horizontal bearing surface, and the loading module (200) and the fixing fixture (100) are disposed on the bearing surface.

8. The motor torque measuring device according to claim 7, characterized in that, The motor torque measuring device (10) also includes a chassis (700), the bracket (600) is mounted on the chassis (700), and the control module is mounted inside the chassis (700).

9. The motor torque measuring device according to claim 1, characterized in that, The fixing fixture (100) includes: Base (110); A fixing seat (120) is disposed on the base (110), and the fixing seat (120) has a first limiting groove (121) with the opening facing upward; A cover plate (130) is movably connected to the base (110) to cover or open the fixed seat (120). The cover plate (130) has a second limiting groove (131). When the cover plate (130) covers the fixed seat (120), the openings of the first limiting groove (121) and the second limiting groove (131) are vertically opposite to each other. The first limiting groove (121) and the second limiting groove (131) together form the limiting groove (101).

10. The motor torque measuring device according to claim 9, characterized in that, The cover plate (130) is movably connected to the base (110) via a second elastic element (150). The fixing seat (120) is movably provided with a buckle (140), which is used to engage with the cover plate (130) when the cover plate (130) closes the fixing seat (120). The second elastic element (150) is configured to provide the elastic force required to switch the cover plate (130) from the state of closing the base (110) to the state of opening the base (110) when the buckle (140) disengages from the cover plate (130).

Images