Magnetic field measurement system and method of use thereof

Abstract

The invention provides a magnetic field measuring system which can be applied to the technical field of magnetic field performance measurement, the magnetic field measuring system comprises a rotating coil measuring system and an articulated arm measuring machine, the rotating coil measuring system comprises a first fixed base, a second fixed base, a standard measuring base and a coil clamping device, the positions of the coil clamping device and the articulated arm measuring machine are relatively fixed; the coil clamping device is used for fixing the rotating coil; the standard measuring base is used for supporting and fixing the rotating coil and serves as a reference surface of the measuring system. And the articulated arm measuring machine is used for establishing a coordinate system and a measurement control network of the to-be-measured magnet and the rotating coil. A traditional rotating coil measurement system is combined with an articulated arm collimation system, and during measurement, collimation positioning of a magnet and a coil can be completed without an additional space measurement system, so that a large number of test resources are saved. The invention also provides a use method of the magnetic field measurement system.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic field performance measurement, and in particular to a magnetic field measurement system and a use method thereof. Background Art

[0002] At present, the alignment method of the rotating coil measurement system in the process of measuring magnet performance is as follows: when the magnet and the rotating coil are installed, the laser tracker is used to measure the coil diameter coordinate values ​​at the front and rear ends of the rotating coil, and the cylinder is fitted. The central axis of the rotating coil is obtained by software analysis, and the central axis is used as a reference coordinate axis of the magnet measurement coordinate system. Since the direction of the magnet coordinate system is consistent with the direction of the rotating coil coordinate system, the rotating coil coordinate system is determined, and the calibration value of the magnet is brought in. The magnetic field performance measurement can be performed only after the rotating coil coordinate system and the magnet mechanical center coordinate system are coincident by adjusting the magnet.

[0003] With the increase of test laboratories, test systems and test tasks, the frequency of using laser trackers has increased significantly. Each time it is used, it has to be manually moved back and forth, which is very inconvenient. It not only increases the risk of equipment damage, but also reduces the test efficiency. Especially when measuring batches of magnets of the same specification, the measurement coordinate system and measurement control network must be re-established before testing. This method wastes a lot of manpower and material resources. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to solve at least one of the above-mentioned technical problems that occur in the process of measuring magnet performance by the rotating coil measurement system in the prior art, an embodiment of the present invention provides a magnetic field measurement system and a method of using the same. The system for measuring the rotating coil using an articulated arm is a new test system that combines the traditional rotating coil measurement system with the articulated arm alignment system. During measurement, the alignment and positioning of the magnet and the coil can be completed without an additional spatial measurement system, saving a large amount of test resources. The coordinate system and measurement control network of the magnet to be tested and the rotating coil are established simultaneously using the articulated arm, greatly improving the test efficiency. At the same time, the measurement accuracy of the articulated arm measuring machine is within 0.03 mm, which meets the requirements of most magnet alignment and positioning.

[0006] (II) Technical solution

[0007] In view of the above technical problems, an embodiment of the present invention provides a magnetic field measurement system and a method for using the same.

[0008] According to a first aspect of the present invention, a magnetic field measurement system is provided, comprising: a rotating coil measurement system and an articulated arm measuring machine, wherein the rotating coil measurement system comprises a first fixed base, a second fixed base, a standard measurement base and a coil clamping device, the positions of the first fixed base and the second fixed base are relatively fixed, the first fixed base is used to fix the coil clamping device, and the second fixed base is used to fix the articulated arm measuring machine; the coil clamping device is used to fix the rotating coil; the standard measurement base is used to support and fix the rotating coil, and at the same time serves as a reference surface of the measurement system; the articulated arm measuring machine is used to establish a coordinate system and a measurement control network for the magnet to be measured and the rotating coil. In some exemplary embodiments, the articulated arm measuring machine is driven by a motor for rotation.

[0009] In some exemplary embodiments, the rotating coil measurement system further includes a height adjustment knob, and the height adjustment knob is used to adjust the height of the rotating coil so that the central axis of the rotating coil coincides with a preset central axis.

[0010] In some exemplary embodiments, the measurement repeatability of the articulated arm measuring machine is within 0.03 mm.

[0011] In some exemplary embodiments, the rotating coil measurement system further includes a measurement reference block, wherein a positioning reference hole is provided on the measurement reference block, and the coordinate value of the positioning reference hole is used as a reference for testing and adjusting the coil height.

[0012] According to a second aspect of the present invention, there is provided a method for using the magnetic field testing system, comprising: installing a magnet and a test rotating coil; clamping a standard measuring base at the front and rear ends of the rotating coil; using an articulated arm to collect measuring points on the standard measuring base, fit a cylinder, construct a preset rotation center axis, and create a measuring system coordinate system; based on the measuring system coordinate system, measuring the coordinate values ​​of the reference positioning holes on the reference block; using the calibrated magnet target value, adjusting the magnet so that the magnet mechanical coordinate system coincides with the measuring system coordinate system; calibrating all test rotating coils and recording the coil heights.

[0013] In some exemplary embodiments, the method further includes: after replacing a new coil, adjusting the height of the rotating coil by means of a height adjustment knob so that the height of the coil center axis is consistent with the preset height of the rotation center axis.

[0014] In some exemplary embodiments, using the articulated arm to collect measurement points on a standard measurement base includes collecting at least 18 measurement points on each of the measurement bases at both ends of the coil using the articulated arm by rotating the arm with a motor.

[0015] In some exemplary embodiments, the test rotating coil uses the smallest specification A rotating coil as a reference.

[0016] In some exemplary embodiments, adjusting the height of the rotating coil includes adjusting the height of the rotating coil based on the coordinate value of the reference positioning hole.

[0017] (III) Beneficial effects

[0018] It can be seen from the above technical solutions that a magnetic field measurement system and a method of using the same provided by the embodiments of the present invention have at least the following beneficial effects:

[0019] (1) The measurement system using an articulated arm to rotate the coil is a new test system that combines the traditional rotating coil measurement system with the articulated arm alignment system. During measurement, the alignment and positioning of the magnet and coil can be completed without the need for an additional spatial measurement system, saving a lot of test resources.

[0020] (2) The joint arm is used to simultaneously establish the coordinate system and measurement control network of the magnet to be tested and the rotating coil, greatly improving the test efficiency. At the same time, the measurement repeatability of the joint arm measuring machine is within 0.03mm, which meets the requirements of most magnet alignment and positioning.

[0021] (3) The positions of the articulated arm measuring machine and the coil clamping device are relatively fixed. Once the spatial coordinate system is established, it can be reused for a long time. The test can be started after only adjusting the height direction of the magnet to be tested. There is no need to re-establish the measurement coordinate system and control network each time, which improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above contents and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0023] Figure 1 A schematic diagram of the structure of a magnetic field measurement system according to an embodiment of the present invention is shown; and

[0024] Figure 2 The following is a schematic flow chart of a method for using a magnetic field measurement system according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] 1-rotating coil measuring system; 11-first fixed base; 12-coil clamping device; 13-height adjustment knob; 14-measuring reference block; 141-positioning reference hole; 15-second fixed base; 2-articular arm measuring machine. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Figure 1 A schematic structural diagram of a magnetic field measurement system according to an embodiment of the present invention is shown schematically.

[0029] Depend on Figure 1 It can be seen that a magnetic field measurement system according to an embodiment of the present invention includes: a rotating coil measurement system 1 and an articulated arm measuring machine 2, wherein the rotating coil measurement system 1 includes a first fixed base 11, a second fixed base 15, a standard measurement base and a coil clamping device 12, the positions of the first fixed base 11 and the second fixed base 15 are relatively fixed, the first fixed base 11 is used to fix the coil clamping device 12, and the second fixed base 15 is used to fix the articulated arm measuring machine 2; the coil clamping device 12 is used to fix the rotating coil; the standard measurement base is used to support and fix the rotating coil, and at the same time serves as a reference plane for the measurement system; and the articulated arm measuring machine 2 is used to establish a coordinate system and a measurement control network for the magnet to be measured and the rotating coil.

[0030] In the embodiment of the present invention, the positions of the articulated arm measuring machine 2 and the coil clamping device 12 are relatively fixed. After the spatial coordinate system is established, it can be reused for a long time. It is only necessary to adjust the height direction of the magnet to be measured before starting the test. It is not necessary to re-establish the measurement coordinate system and control network each time, thereby improving the test efficiency. The measurement system that uses the articulated arm to perform online positioning and alignment of the rotating coil realizes seamless connection between the device and the system, and can complete the alignment and positioning of the magnet and the coil without an additional spatial measurement system, thereby saving a large amount of test resources.

[0031] In an embodiment of the present invention, the articulated arm measuring machine 2 is driven by a motor. The measurement repeatability of the articulated arm measuring machine 2 is within 0.03 mm. The articulated arm measuring machine 2 first needs to identify the target object through vision or other sensors. This can be achieved through a camera, a laser sensor or other sensing device. Once the target object is identified, the articulated arm measuring machine 2 needs to estimate its posture based on the position and direction of the target object. This can be achieved by calculating the rotation angle and position of the object. Based on the estimated posture of the target object, the articulated arm measuring machine 2 calculates the movement and position of each joint. It uses a driver or motor to control the rotation of the joint to position the measuring device to the correct position. Once the articulated arm measuring machine 2 is positioned in the correct position, it uses built-in sensors to measure the position, shape or other characteristics of the target object. These sensors can be laser rangefinders, cameras or other measuring devices. At the same time, when the device rotates in space, it will obtain angle data from multiple angle encoders. Since the arm length of the device is a certain value, the computer can convert the current position of the probe according to the trigonometric function, thereby converting it into XYZ form.

[0032] Optionally, the rotating coil measurement system 1 further comprises a height adjustment knob 13, and the height adjustment knob 13 is used to adjust the height of the rotating coil so that the central axis of the rotating coil coincides with a preset central axis.

[0033] Optionally, the rotating coil measurement system 1 further comprises a measurement reference block 14 , wherein a positioning reference hole 141 is provided on the measurement reference block 14 , and the coordinate value of the positioning reference hole 141 is used as a reference for testing and adjusting the coil height.

[0034] Figure 2 The following is a schematic flow chart of a method for using a magnetic field measurement system according to an embodiment of the present invention.

[0035] like Figure 2 As shown, a method for using a magnetic field measurement system according to an embodiment of the present invention includes steps S110 to S160.

[0036] In step S110 , the magnet and the test rotating coil are installed.

[0037] The magnet plays a role in determining the reference direction and providing the magnetic field in the measurement system, while the rotating coil is used to detect the change of the magnetic field to obtain information such as the rotation angle. The cooperation between the magnet and the rotating coil is the key to achieving accurate measurement.

[0038] For example, the minimum specification A rotating coil is selected as the benchmark for the test rotating coil. The minimum specification A rotating coil has a small size and weight, which is easy to install and debug. At the same time, it is selected as the benchmark because of its sophisticated design, high measurement accuracy and stability. During the installation process, it is necessary to ensure that the relative position of the magnet and the rotating coil is accurate. Usually, high-precision installation tools and measuring equipment, such as laser rangefinders, microscopes, etc., are required to ensure that the installation accuracy meets the requirements.

[0039] In step S120, a standard measuring base is clamped at the front and rear ends of the rotating coil. The standard measuring base is fixed on both sides of the rotating coil and serves as a reference for the measuring coordinate system of the measuring system.

[0040] The standard measuring base has precise size and shape, which can ensure the stability and accuracy of the rotating coil during the measurement process. By clamping the standard measuring base, a stable measuring platform can be established, providing a reliable benchmark for subsequent data acquisition and fitting.

[0041] In step S130, the articulated arm is used to collect measurement points on the standard measurement base, fit the cylinder, construct the preset rotation center axis, and create a measurement system coordinate system. Preferably, at least 18 measurement points are collected on the measurement bases at both ends of the coil by rotating the motor and using the articulated arm. These points are distributed on the surface and both ends of the cylinder, and can fully reflect the shape and position information of the cylinder. By fitting these points, we can obtain an accurate cylinder model and construct a measurement system coordinate system based on it.

[0042] In step S140, based on the measurement system coordinate system, the coordinate values ​​of the reference positioning holes on the reference block 14 are measured. By measuring the coordinate values ​​of these holes, the relative position relationship between the measurement system coordinate system and the reference block can be determined.

[0043] In step S150, the magnet is adjusted using the calibrated magnet target value so that the magnet mechanical coordinate system coincides with the measurement system coordinate system.

[0044] The magnet target value refers to the position and orientation information of the magnet under a specific magnetic field. By calibrating the magnet target value, the relative position relationship between the magnet mechanical coordinate system and the measurement system coordinate system can be determined. Then, by adjusting the position and orientation of the magnet, the two coordinate systems can be made to coincide, thereby achieving accurate calibration of the measurement system.

[0045] In step S160, all test rotating coils are calibrated and the coil heights are recorded.

[0046] The calibration of the test rotating coil refers to determining the coil's sensitivity, linearity and other performance indicators by measuring the coil's response characteristics under different magnetic fields. At the same time, recording the coil's height information can help us better understand the coil's geometric characteristics and positional relationship.

[0047] In the embodiment of the present invention, the articulated arm can be used to measure multiple measurement points of each test rotating coil, and these points can be used to fit the shape and position information of the coil. Then, the height value of the coil is obtained by calculation and recorded in the coordinate system of the measurement system. At the same time, the coil is tested for sensitivity and linearity to ensure that its performance indicators meet the requirements.

[0048] In the embodiment of the present invention, after replacing the new coil, the height of the rotating coil is adjusted by the height adjustment knob 13 so that the height of the coil center axis is consistent with the preset rotation center axis height. Adjusting the height of the rotating coil includes adjusting the height of the rotating coil based on the coordinate value of the reference positioning hole.

[0049] When the new coil is installed in place, its height may deviate from the preset rotation center axis. This deviation will affect the accuracy and stability of the measurement system. Therefore, it is necessary to fine-tune the coil height using the height adjustment knob 13. During the adjustment process, the coordinate values ​​of the reference positioning hole are used as a reference, and these coordinate values ​​are accurately measured and recorded in the previous steps. By comparing the current height of the coil with the height indicated by the coordinate values ​​of the reference positioning hole, the required height adjustment amount can be accurately calculated. Subsequently, operate the height adjustment knob 13 to gradually adjust the coil height until the center axis of the coil completely coincides with the preset rotation center axis.

[0050] For example, suppose that after replacing a new coil, preliminary measurements reveal that the height of the coil center axis is 2 mm lower than the preset rotation center axis. At this point, we activate the fine-tuning function of the height adjustment knob 13. First, refer to the previously recorded coordinate values ​​of the reference positioning holes to find the reference data related to the coil height. Then, based on these data, calculate the exact height to which the coil needs to be raised, which is 2 mm. Next, slowly rotate the height adjustment knob 13, fine-tuning a small distance each time, and use a precision measuring tool to check the change in coil height after each adjustment. After several fine-tunings, the height of the coil center axis is completely consistent with the preset rotation center axis height, thus ensuring the accuracy and stability of the measurement system.

[0051] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are 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 magnetic field measurement system, characterized in that: include: Rotating coil measuring systems and articulated arm measuring machines, The rotating coil measuring system comprises a first fixed base, a second fixed base, a standard measuring base and a coil clamping device, the positions of the first fixed base and the second fixed base are relatively fixed, the first fixed base is used to fix the coil clamping device, and the second fixed base is used to fix the articulated arm measuring machine; The coil clamping device is used to fix the rotating coil; The standard measuring base is used to support and fix the rotating coil and serves as a reference surface of the measuring system; and The articulated arm measuring machine is used to establish a coordinate system and a measuring control network for the magnet to be measured and the rotating coil.

2. The magnetic field measurement system according to claim 1, characterized in that: The articulated arm measuring machine is rotationally driven by a motor.

3. The magnetic field measurement system according to claim 1, characterized in that: The rotating coil measurement system further comprises a height adjustment knob, and the height adjustment knob is used to adjust the height of the rotating coil so that the central axis of the rotating coil coincides with a preset central axis.

4. The magnetic field measurement system according to claim 1, characterized in that: The measurement repeatability of the articulated arm measuring machine is within 0.03 mm.

5. The magnetic field measurement system according to claim 1, characterized in that: The rotating coil measurement system further comprises a measurement reference block, wherein a positioning reference hole is provided on the measurement reference block, and the coordinate value of the positioning reference hole is used as a reference for testing and adjusting the coil height.

6. A method for using the magnetic field testing system according to any one of claims 1 to 5, characterized in that: The method comprises: Install magnets and test rotating coils; Clamp the standard measuring base at the front and rear ends of the rotating coil; Use the articulated arm to collect measurement points on the standard measurement base, fit the cylinder, build the preset rotation center axis, and create the measurement system coordinate system; Based on the measurement system coordinate system, measure the coordinate value of the reference positioning hole on the reference block; Using the calibrated magnet target value, adjust the magnet so that the magnet mechanical coordinate system coincides with the measurement system coordinate system; Calibrate all test rotating coils and record the coil height.

7. The method of use according to claim 6, characterized in that: The method further comprises: After replacing the new coil, adjust the height of the rotating coil using the height adjustment knob to make the height of the coil center axis consistent with the preset rotation center axis height.

8. The method of use according to claim 6, characterized in that: The method of using the articulated arm to collect measurement points on the standard measurement base includes: using the articulated arm to collect at least 18 measurement points on the measurement bases at both ends of the coil by rotating the motor.

9. The method of use according to claim 6, characterized in that: The test rotating coil uses the smallest specification A rotating coil as a reference.

10. The method of use according to claim 7, characterized in that: The adjusting the height of the rotating coil includes adjusting the height of the rotating coil based on the coordinate value of the reference positioning hole.

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