Coil output test system using three force sensors for measurement

Abstract

The invention relates to a coil output testing system using three force sensors for measurement, and belongs to the technical field of coil quality detection and current testing. Comprising a coil, a permanent magnet, a three-dimensional sliding table and a force sensor, a coil and a force sensor are arranged on the three-dimensional sliding table; the coil is located above the permanent magnet, and more than three force sensors are arranged in the circumferential direction of the coil. The device is used for the output test of the coil, and can directly calculate the forces and moments of the to-be-tested coil in the X, Y and Z directions after the measurement result of the force sensor is obtained. Front-back pulling type assembly instead of interference type assembly is adopted, damage to the coil and the measuring device in the measuring process is reduced, the measuring efficiency is improved, and more convenience and rapidness are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a coil force test system measured by three force sensors, and belongs to the technical field of coil quality detection and current test. BACKGROUND

[0002] In engineering practice, it is often necessary to test the coil force to ensure the quality of the coil or measure the state of the current passing through the coil. Measuring the coil force generally requires two experiments. One is to measure the coil force coefficient, at which time the current phase can be changed by 2 or the coil is moved to exceed one period of the magnetic field, and the other is to measure the coil force fluctuation, at which time the current needs to change the phase with the distance of the coil passing through the magnetic field. The coil force test system in the prior art uses one or two force sensors. Using one force sensor cannot measure the size of the torque perpendicular to the plane of the coil, and using two force sensors cannot measure the size of the coil torque in the direction of the connecting line of the two sensors.

[0003] Therefore, it is urgent to provide a coil force test system measured by three force sensors to solve the above technical problems. SUMMARY

[0004] To solve the problem of coil torque measurement, a coil force test system measured by three force sensors is provided. In the following, a brief summary of the present application is given to provide a basic understanding of some aspects of the present application. It should be understood that this summary is not an exhaustive summary of the present application. It is not intended to determine the key or important parts of the present application, nor to limit the scope of the present application.

[0005] Technical scheme of the present application: A coil force test system measured by three force sensors, comprising: a coil, a permanent magnet, a three-dimensional slide and a force sensor; The three-dimensional slide is provided with a coil and a force sensor; The coil is located above the permanent magnet, and the coil is arranged with more than three force sensors in the circumferential direction.

[0006] Preferably, the coil is a three-phase coil, the long side of the coil is arranged along the Z direction of the three-dimensional slide, the short side of the coil is arranged along the X direction of the three-dimensional slide, and the Y direction of the three-dimensional slide adjusts the distance between the coil and the permanent magnet.

[0007] Preferably, the permanent magnet is arranged in a 2D Halbach array.

[0008] Preferably, the number of force sensors is three, the three force sensors form an equilateral triangle, and the center of the coil is coaxial with the geometric center of the triangle.

[0009] Preferably, the clamps, the object table and the mounting frame are further included, the object table is in sliding connection with the mounting frame, the object table is provided with clamps for clamping the coil, and the bottom surface of the mounting frame is fixedly provided with a force sensor.

[0010] Preferably, the coil is arranged in parallel with the permanent magnet.

[0011] Preferably, the object table is made of a non-magnetic material.

[0012] Preferably, current is passed into the three-phase coil to measure the horizontal and vertical forces; then a fixed current is passed into the middle coil of the coil alone, the coil is moved left and right, and the forces in three directions of the coil are detected through the force sensor; subsequently, the current value passed into the middle coil is doubled, and the forces of the coil are detected again.

[0013] Preferably, the forces and moments of the coil are solved by three force sensors through a solving method, each force sensor can measure six quantities, which are x-direction force , y-direction force . In order to distinguish the data measured by different force sensors, 1, 2 and 3 are marked at the lower right corner of the variable to represent different force sensors; eighteen quantities measured by the force sensor are directly used to solve six quantities of the coil; the distance of the connecting line between the force sensors is measured first, and the distance is set as 3a, then the quantities to be solved of the coil are solved according to the force system simplification. ; ; ; ; ; .

[0014] The present application has the following beneficial effects: The present application is used for testing the output of the coil, and the size of the forces and moments of the coil in X, Y and Z directions can be directly calculated after the result measured by the force sensor is obtained; The coil assembly of the present application adopts a front and rear pulling type instead of an interference type, so that the damage to the coil and the measuring device during measurement is reduced, the measurement efficiency is improved, and the measurement is more convenient and fast. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure diagram of a coil output test system measured by three force sensors.

[0016] Figure 2 It is a bottom view of a coil output test system measured by three force sensors.

[0017] Figure 3 It is a force sensor layout of a coil output test system measured by three force sensors.

[0018] Figure 4 It is a force sensor simplified diagram of a coil output test system measured by three force sensors. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described below in detail through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0020] DETAILED DESCRIPTION Figures 1-3 In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described below in detail through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application. The three-dimensional slide 5 is provided with the coil 1 and the force sensor 6; since the coil needs to move frequently during the coil output test, a three-dimensional slide is used to carry three coils, and the position of the coil is changed through the guide rails in x, y and z directions The coil 1 is located above the permanent magnet 4, and the coil 1 is circumferentially provided with three or more force sensors 6. The present application is used for the output test of the coil, and the test object is a three-phase coil. After the measurement result of the force sensor is obtained, the size of the force and the torque of the coil to be measured in X, Y and Z directions can be directly calculated. The coil assembly of the present application adopts a front and rear pulling type rather than an interference type assembly, which reduces the damage to the coil and the measuring device during measurement, improves the measurement efficiency, and is more convenient and fast.

[0021] DETAILED DESCRIPTION Figures 1-3The embodiment is described, and the coil output test system measured by three force sensors in the embodiment is a three-phase coil, the coil 1 is composed of three copper coils arranged side by side along the X direction, the long side of the coil 1 is arranged along the Z direction of the three-dimensional sliding table 5, the short side of the coil 1 is arranged along the X direction of the three-dimensional sliding table 5, the three-dimensional sliding table 5 and the permanent magnet 4 can be fixedly arranged on the platform, the Y direction of the three-dimensional sliding table 5 can adjust the vertical distance between the coil 1 and the permanent magnet 4; the output end of the moving mechanism in the Z direction of the three-dimensional sliding table 5 is connected with and drives the moving structure in the X direction, the output end of the moving structure in the X direction is connected with and drives the moving structure in the Y direction, the moving mechanisms are all lead nut and screw rod structures, the lead nut (output end) realizes linear motion through the slide rod, and finally the lead nut outputs the motion of the three coordinates through the moving structure in the Y direction, so that the coil 1 mounted thereon realizes three-dimensional adjustment relative to the permanent magnet 4 fixed below the coil; the long side of the coil 1 is useful for output, but the short side (arc segment) is an interference force in the magnetic field, and in an ideal case, the short side force can be offset under the condition that the coil length is appropriate; but in practice, most of the generated force can be offset, but the torque generated by the short side force cannot be offset; the coil short side force test is performed; the force sensor is fixed with a set of three-phase coils, star connection is adopted, and a direct current power supply is used for power supply; the force sensor is connected with a computer, and the measured value of the sensor can be obtained through the matching software; then the coil is moved along the long side direction of the coil, and the force sensor reading is observed, so that the maximum short side force can be measured.

[0022] Specific implementation method three: in combination Figures 1-3 The embodiment is described, and the coil output test system measured by three force sensors in the embodiment is a three-phase coil, the coil 1 is composed of three copper coils arranged side by side along the X direction, the long side of the coil 1 is arranged along the Z direction of the three-dimensional sliding table 5, the short side of the coil 1 is arranged along the X direction of the three-dimensional sliding table 5, the three-dimensional sliding table 5 and the permanent magnet 4 can be fixedly arranged on the platform, the Y direction of the three-dimensional sliding table 5 can adjust the vertical distance between the coil 1 and the permanent magnet 4; the output end of the moving mechanism in the Z direction of the three-dimensional sliding table 5 is connected with and drives the moving structure in the X direction, the output end of the moving structure in the X direction is connected with and drives the moving structure in the Y direction, the moving mechanisms are all lead nut and screw rod structures, the lead nut (output end) realizes linear motion through the slide rod, and finally the lead nut outputs the motion of the three coordinates through the moving structure in the Y direction, so that the coil 1 mounted thereon realizes three-dimensional adjustment relative to the permanent magnet 4 fixed below the coil; the long side of the coil 1 is useful for output, but the short side (arc segment) is an interference force in the magnetic field, and in an ideal case, the short side force can be offset under the condition that the coil length is appropriate; but in practice, most of the generated force can be offset, but the torque generated by the short side force cannot be offset; the coil short side force test is performed; the force sensor is fixed with a set of three-phase coils, star connection is adopted, and a direct current power supply is used for power supply; the force sensor is connected with a computer, and the measured value of the sensor can be obtained through the matching software; then the coil is moved along the long side direction of the coil, and the force sensor reading is observed, so that the maximum short side force can be measured.

[0023] Specific implementation method four: in combination Figures 1-3The present embodiment will be described. A coil output test system is provided in which three force sensors are used for measurement. Three force sensors 6 are used. Using only one sensor does not allow measurement of torque perpendicular to the coil plane. Using only two sensors does not allow measurement of coil torque in the direction of the line connecting the two sensors. However, using three sensors allows direct measurement of the forces and moments in the X, Y, and Z directions of the coil. The three force sensors 6 form an equilateral triangle with their respective centers. The center of the coil 1 is coaxial with the geometric center of the triangle. One sensor is located in the middle of the coil 1 in the -Z direction, and the other two sensors are symmetrically located on either side of the coil 1 in the +Z direction, such that the line connecting the other two sensors is parallel to the X direction. To address the problem in conventional coil output test methods where the torque in certain directions of the coil cannot be directly determined using one or two force sensors, three sensors are used for measurement. The three force sensors should be of the same model and have similar service lives to ensure more accurate measurement results. The centers of the three sensors form an equilateral triangle, which is fixed to the z-axis extension platform (stage 3) of the three-dimensional slide.

[0024] Specific implementation method five: Combination Figures 1-3 Describing this embodiment, this embodiment is a coil output test system that is measured by three force sensors, and also includes a fixture 2, a stage 3 and a mounting frame 7. The bottom of the mounting frame 7 is a concave structure, and there are sliders on both sides of the X direction of the stage 3. The side of the concave structure of the mounting frame 7 is processed with a slide along the Z direction. The slider of the stage 3 is arranged in the slide of the mounting frame 7 to form a drawer structure, so that the stage 3 is slidably connected to the mounting frame 7. A fixture 2 for clamping the coil 1 is provided on the stage 3. The fixture 2 may include two L-shaped elastic sheets fixed to the stage 3, and the L-shaped elastic sheets are located on both sides of the coil 1 to clamp the coil 1, or the fixture 2 adopts spring chucks respectively arranged on both sides of the coil, and a force sensor 6 is fixed on the bottom surface of the groove of the mounting frame 7; the drawer structure is adopted to facilitate the replacement and position adjustment of the coil 1; the coil assembly of the present invention adopts a front and back pulling type rather than an interference type assembly, which reduces damage to the coil and the measuring device during measurement, improves the measurement efficiency, and is more convenient and quick.

[0025] Specific implementation method six: combination Figures 1-3 The present embodiment is described as a coil output test system that is measured by three force sensors. The coil 1 is arranged in parallel with the permanent magnet 4, and a 2D Halbach array is used to achieve the purpose of generating the strongest magnetic field with the least magnets. When it is installed on the bottom surface of the entire device, the magnetic field can fill the entire space where the coil moves, so that the coil can be made to cut the magnetic lines of force during measurement.

[0026] Specific implementation method seven: combination Figures 1-3In this embodiment, the coil output test system measured by three force sensors uses a non-magnetic material (carbon fiber composite material) for the object table 3 to reduce interference.

[0027] Specific embodiment eight: combination Figures 1-3 In this embodiment, the coil output test system measured by three force sensors applies a set current to a set of three-phase coils to measure the horizontal and vertical forces. Next, a fixed current is applied to the middle coil of the coil 1, and the coil 1 is moved left and right (X). The forces in three directions of the coil 1 are detected by the force sensor 6. Then, the current value applied to the middle coil is doubled, and the coil 1 is moved left and right again to detect the forces. The force sensor 6 can be connected to a computer to display the readings on the screen for easy observation.

[0028] Specific embodiment nine: combination Figures 1-4 In this embodiment, the coil output test system measured by three force sensors measures the coil placed on the object table, which is clamped by spring chucks on both sides. The object table can be slid into the z-axis platform (groove). When the coil is installed, the object table can be pulled out, the spring chucks are opened, the coil is placed inside, and then the spring chucks are clamped. Then, the object table is pushed back into the z-axis platform. After the test, the object table is pulled out, and the spring chucks are opened to remove the coil. Compared with the traditional method of directly installing the coil in the middle of the force sensor, the transition of the object table reduces the damage to the coil and the force measuring device during installation and removal. After use, it is also convenient to remove and facilitate the output test of multiple coils. After the measurement, the force and torque measured by the sensor are combined with the solving method to determine the output of the coil. Compared with other coil output test schemes, this method can directly obtain the forces in three directions and the torques in three directions through the solving method in one step, which is more convenient for coil output test. In addition, the drawer-type object table can reduce the damage to the coil and the measuring device during each installation and removal of the coil, and it is also convenient to install and remove the coil. Before the coil output test, the coil and array surface are leveled and the air gap height is adjusted. A set of three-phase coils is applied with a set current to measure the horizontal and vertical forces. Next, a fixed current is applied to the middle single coil, and the coil is moved left and right to observe the forces in three directions. Then, the current value is doubled, and the coil is moved left and right again to observe the forces. The long side of the coil is useful for output, but the short side arc segment is a disturbing force in the magnetic field. In an ideal case, the short side force can be offset with proper coil length. However, in practice, most of the force can be offset, but the torque generated by the short side force cannot be offset. The short side force of the coil is tested. The force sensor is fixed with a set of three-phase coils, star connection is adopted, and a direct current power supply is used. The force sensor is connected with a computer, and the measured value of the sensor can be obtained through the matching software. Then the coil is moved along the long side direction, and the force sensor reading is observed. The maximum force of the short side can be measured. To solve the problem that one or two force sensors in the traditional coil output test method cannot directly obtain the torque in some directions, three sensors are used for measurement. The three force sensors should have the same type and similar service life to make the measurement result more accurate. The centers of the three sensors form an equilateral triangle and are fixed on the extension platform of the three-dimensional sliding table z-axis. The force and torque of the coil 1 can be directly solved by three force sensors 6 through solving method. Now the solving method is analyzed in combination with Figure 4 a simple model: The positive directions of x and y axes are shown in the figure, and the positive direction of z axis is perpendicular to the paper and outward. The three force sensors form an equilateral triangle, and the center of the coil to be measured is located at the geometric center of the triangle. Each force sensor can measure six quantities, which are the x direction force , y direction force . To distinguish the data measured by different force sensors, 1, 2 and 3 are marked at the lower right corner of the variable to represent different force sensors, such as , which represents the size of the x direction force measured by sensor 1. The eighteen quantities measured by the force sensors can be used to directly solve the six quantities of the coil 1 to be solved. The distance between force sensor 1 and force sensor 2, 3 is measured in advance, which is set as 3a. According to force system simplification, the quantities to be solved of the coil are: ; ; ; ; ; ; The positive and negative of each quantity in the above formula are defined as positive if they are consistent with the positive direction of the xyz coordinate system, and negative otherwise. The positive and negative are taken into account when substituting the formula; Only the results measured by the three force sensors are substituted into the method, and the output test results of the coil can be obtained. The measurement, calculation and operation are very convenient, and the results are accurate.

[0029] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, the technical solutions can be arranged and combined, and a person skilled in the art can exhaust all possibilities according to the mathematical knowledge of arrangement and combination, so the technical solutions after arrangement and combination will not be described one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present application.

[0030] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A coil output test system using three force sensors for measurement, characterized by: include: Coil (1), permanent magnet (4), three-dimensional slide (5) and force sensor (6); A coil (1) and a force sensor (6) are provided on the three-dimensional slide (5); The coil (1) is located above the permanent magnet (4), and more than three force sensors (6) are arranged circumferentially around the coil (1).

2. The coil output test system using three force sensors for measurement according to claim 1, characterized in that: The coil (1) is a three-phase coil, the long side of the coil (1) is arranged along the Z direction of the three-dimensional slide (5), the short side of the coil (1) is arranged along the X direction of the three-dimensional slide (5), and the Y direction of the three-dimensional slide (5) adjusts the distance between the coil (1) and the permanent magnet (4).

3. A coil output test system using three force sensors for measurement according to claim 1 or 2, characterized in that: The permanent magnets (4) are arranged in a 2DHalbach array.

4. A coil output test system using three force sensors for measurement according to claim 1 or 2, characterized in that: The number of the force sensors (6) is three, and the three force sensors (6) form an equilateral triangle, and the center of the coil (1) is coaxial with the geometric center of the triangle.

5. The coil output test system using three force sensors for measurement according to claim 4, characterized in that: The device further comprises a clamp (2), a loading platform (3) and a mounting frame (7), wherein the loading platform (3) is slidably connected to the mounting frame (7), a clamp (2) for clamping the coil (1) is provided on the loading platform (3), and a force sensor (6) is fixedly provided on the bottom surface of the mounting frame (7).

6. The coil output test system using three force sensors for measurement according to claim 5, characterized in that: The coil (1) and the permanent magnet (4) are arranged in parallel.

7. The coil output test system using three force sensors for measurement according to claim 6, characterized in that: The stage (3) is made of non-magnetic material.

8. The coil output test system using three force sensors for measurement according to claim 6, characterized in that: Current is passed through the three-phase coils to measure the horizontal and vertical forces. Next, a fixed current is passed through the middle coil of the coil (1) alone, and the coil (1) is moved left and right. The forces in the three directions of the coil (1) are detected by the force sensor (6). Then, the current value passed through the middle coil is doubled, and the coil (1) is moved left and right again to detect the forces.

9. The coil output test system using three force sensors for measurement according to claim 8, characterized in that: The force and torque on the coil (1) are solved by three force sensors (6). Each force sensor can measure six quantities, namely: , force in y direction To distinguish the data measured by different force sensors, 1, 2, and 3 are marked in the lower right corner of the variable to represent different force sensors; the six quantities to be calculated for coil (1) are directly calculated from the eighteen quantities measured by the force sensors; first measure the distance between the force sensors and set this distance to 3a. Then, by simplifying the force system, we can know that the quantities to be calculated for the coil are: ; ; ; ; ; 。

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