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Research and development process of magnetic field distribution on the surface of multi-pole magnetizing magnetic ring FE-2100R table magnetic distribution measuring instrument
Release time:
2019-07-18
Source:
Www.fe2100.com
In the permanent magnet motor industry, it is quite common to use permanent magnet materials to design the stator or rotor. The demand for accurate measurement of the surface magnetic field distribution of the designed permanent magnet stator or rotor is becoming more and more important, and accurate measurement and related analysis are also very important.
In the permanent magnet motor industry, it is quite common to design stators or rotors with permanent magnet materials. The demand for accurate measurement of the surface magnetic field distribution of the designed permanent magnet stator or rotor is becoming more and more important. Accurate measurement and related analysis are also very important. Relevant products have been designed and manufactured since the late 1990 s (the earliest product in China was Mr. Meng Xianhong).
Multi-pole magnetizing magnetic ring (including radial inner and outer magnetizing, plane axial magnetizing, etc.), accurate test magnetic field distribution waveform (specifically including magnetic pole amplitude, magnetic pole width, half-height width, duty ratio, etc.) is of great practical significance, deviation analysis, harmonic wave analysis, 3D magnetic field distribution visual magnetic field analysis is also becoming more and more important.
The test principle of the magnetic field distribution of the multi-pole magnetizing magnetic ring is quite simple. According to the description of the test process, it is often called rotation.GaussiometerIn the era of underdeveloped computer control, the manual record of rotating test by fixing the sample on a turntable with polar coordinates can be traced back to earlier (early Taiwan products). After 2000, electric rotating control platform products were launched one after another, improving the test efficiency and test accuracy.
It is a great pity that the production enterprises neglected in the production process of related products.Table magnetic distribution testInstrumentThe most critical technical index, namely rotational concentricity, has been in large quantities since 2001.Table Magnetic Distribution TesterThere are no less than 10 domestic manufacturing enterprises and more than 8 foreign enterprises (Japan, South Korea, Germany, etc.) I know. The neglect of concentricity index has doomed the price of the modified products to plummet. The first multi-pole magnetic ring magnetic field distribution tester (Dongfang Chenjing RMT-301 type) in China has been launched successively by Shandong Meng Teacher Simple Device, Xianda, Chinese Academy of Metrology, Tianyu, Lianzhong, Hirano, Xinglong and Jinda to meet the testing needs of users at home and abroad.
During this period, I also had the honor to repair the same type of products in Japan. In the process of calibrating and testing the probe, I found that Japanese equipment also had insufficient concentricity. Equipment calibration could only rely on the magnetic ring issued by them to approach the adjustment (perhaps the concentricity corresponding to their factory). In the late pairTable Magnetic distribution measuring instrumentDuring a large number of tests and debugging, it was found that a good magnetic field distribution measuring instrument is not a simple rotating gaussmeter. The problem that manufacturers should actively solve is how to continuously improve the rotation concentricity of products (including Japanese products), instead of requiring users to use flexible probes to cling to the tested magnetic rings. In the previous log, I have carried out the analysis and calculation of concentricity deviation, which will not be repeated here. In fact, it is well understood by everyone to think about it a little. The rotating concentricity is not good. The flexible probe is used to stick the magnetic ring. The Hall plate will move back and forth in the normal direction, which will directly affect the peak data (decrease) and the most fatal is the test deviation causing the magnetic pole width.
Contact with many magnetizing fixture design engineers in the same industry, they have been tired for only 10 years. The magnetizing fixture has been continuously adjusted according to the report of the surface magnetic distribution tester, requiring the processing industry to continuously improve the cutting accuracy and the winding process, but the result is still not ideal. In fact, if he tests the concentricity, these problems will be put forward to the equipment supply enterprises as soon as possible.
The equipment supplier will not tell the user about the defects of his equipment until the equipment problem is solved, but will only cater to the user to make the desired products. For example, if the user proposes to make the chuck with non-magnetic material, the chuck head will be changed to copper or aluminum alloy, or the chuck manufacturer will be asked to directly process aluminum alloy. And think of different ways to improve the rotation concentricity, as far as possible will do a good job of rotation concentricity. The actual effect is not satisfactory. The main problems are as follows:
1. The chuck is of low grade. The rotational concentricity index of the chuck itself around 300 yuan is not enough. No matter how people adjust it, it is of little significance. To do a good job in the product, at least the same chuck as the concentricity meter needs to be selected;...
2. What is more difficult is how to ensure the concentricity after connecting the shaft with the chuck. The concentricity meter manufacturer has a good method, but the price of the magnetic field test software configured with the concentricity meter will exceed the user's price acceptance (unless the military industry, I will recommend adopt this method, and the rotation concentricity can reach 0.01mm).
3. Since 2011, looking at foreign counterparts, there were really no relevant indicators except that German Margree products had a concentricity better than 0.05mm. However, Germany's Margree products provide a rotating platform with no chuck on it, which means that it has nothing to do with them whether you do well or not and whether you meet the concentricity.
FoundingHunan Yongyi Technology Co., Ltd.Is to lead a group of like-minded friends, will be engaged in their ownMagnetic measuring equipmentThe problems found in the manufacturing process can be solved and the domestic magnetic measurement technology level can be improved. At the same time, it is also expected that the enterprise will gradually improve the testing requirements, and the leading technology will establish the enterprise brand and image as soon as possible. At the beginning of 2012, Bosch electrician put forward the strict requirements in this respect, and carried out the assessment in this respect in China. The company took over the production and development of the required products. After nearly half a year's efforts, a platform with a rotational concentricity of less than 0.05mm was created in 2012. After vibration experiments and long-term experimental operation of users, it met the requirements of rotational concentricity. It became the first enterprise in the same industry to include the concentricity index in the table magnetic distribution test device, and was recognized by enterprises such as Magkun Magnetic, DJI Technology and Longci Technology. Since the product was sold in 2012, the Chinese and English versions of the software were completed in 2014, and the products were exported to Taiwan, Thailand, Iran, Russia, Singapore, the United States and other countries, becoming products participating in international competition.
User requirements for testing are constantly increasing,Measuring equipmentIt also needs continuous development and improvement,Test softwareAlso need to continue to add features, in order to ensure the advanced nature of the product. ForTesting of multipole magnetic ringsThe current requirements are far more than just the initial test waveform, amplitude and pole width. The meaning of the test waveform will be continuously transmitted to the user, so that the user can have a more comprehensive understanding of the motor design according to the waveform, which will be more meaningful.Hunan Yongyi Technology Co., Ltd.The first generation of test software carried out harmonic analysis on the magnetic field distribution waveform, which was used to provide help and guide the improvement of the motor manufactured by the magnetizing waveform in the later period. The second generation improved the 3D test to visual magnetic field (independent intellectual property rights), with any angle vision and azimuth rotation, which is convenient for users to find distribution defects.FE-2100R Series Surface Magnetic Field Distribution Measuring InstrumentCovers the multipolar torusTable Magnetic Distribution Measurement,Measurement of magnetic distribution on linear surface,planar surface magnetic distribution measurementandspatial magnetic field distribution measurementIt is an excellent product for accurate measurement of surface magnetic field distribution. It has become a high-quality product in surface magnetic field distribution test equipment such as multi-pole magnetic rings and magnets. It provides accurate magnetic field distribution data for motor design, and can completely correctly evaluate the magnetizing accuracy of magnets. It has been adopted by many well-known companies.
The following is a description of harmonic analysis, French mathematician J.-B.-J. Fourier in the study of boundary value problems for partial differential equations. Thus greatly promoted the development of the theory of partial differential equations. In China, Cheng Minde was the first to systematically study multivariate trigonometric series and multivariate Fourier series. He first proved the uniqueness theorem for spherical sums of multivariate trigonometric series and revealed many properties of the Reese-Bochner spherical average of multivariate Fourier series. Fourier series has greatly promoted the development of the theory of partial differential equations. It has important applications in mathematical physics and engineering.
Harmonic frequency is an integral multiple of the fundamental frequency, according to the French mathematician Fourier (M.Fourier) analysis principle proves that any repeated waveform can be decomposed into containing the fundamental frequency and a series of fundamental multiples of the harmonic sine wave component. At the same time, according to the different harmonic frequency, can be divided:
Odd: The rated frequency is an odd multiple of the fundamental frequency harmonics, known as "odd harmonics", such as 3, 5, 7 harmonics.
Even order: the harmonic whose rated frequency is an even multiple of the fundamental frequency is called "even harmonic", such as 2, 4, 6 and 8 harmonics.
In the multi-pole magnetic ring table magnetic distribution test device, we have introduced a harmonic analysis report. the mathematical transformation formula of Fourier transformation is: f(t)= a0 a1 sin(ω t θ 1) a2 sin(2 ω t θ 2) a3 sin(3 ω t θ 3) ... ansin(n ω t θ n)
In the formula, a0 represents the DC component, and for the multi-pole magnetically charged rotor, it is shown as an asymmetric total analysis of NS poles. a1 represents the amplitude of the fundamental wave, ωt represents the frequency of the fundamental wave, θ1 represents the phase angle of the fundamental wave, and an represents the fundamental wave.
At the same time, it can be seen that the harmonics are sine waves, and each harmonic has a different frequency (integer multiple of the fundamental wave), and the corresponding amplitude and phase angle.
Generally speaking, odd harmonics cause more harm than even harmonics. For rotating generators and motors, harmonic current or harmonic voltage generates additional losses in stator windings, rotor circuits and iron cores, thus reducing the efficiency of power generation, transmission and electrical equipment. What is more serious is that harmonic oscillation is easy to cause the turbine generator to generate oscillation torque, and the motor noise is correspondingly increased, which may even cause mechanical resonance, causing turbine blades to twist and fatigue cycle, resulting in equipment failure to work normally.
Note: The blue waveform is the actual test waveform; the red waveform is the ideal sine waveform; the upper limit and lower limit of the green double-line peak are judged to be qualified or not.
2. Hunan Yongyi Technology Complete Board XY Coordinate Test Report Sample
3. Complete Plate Polar Coordinate Test Report
4. Full Harmonic Test Report
5. single 3D report sample (angle of view 40 °, azimuth 18 °)
Attachment 1: Observe whether the magnetic pole is inclined (viewing angle 90 °, azimuth angle 0 °, which is equivalent to expanding the magnetic pole in the circumferential direction)
Appendix 2: Observation of radial magnetic field amplitude fluctuation (viewing angle 0 °, azimuth angle 0 °)
Annex 3: Observe any angle (FE-2100R multipole test softwareFor the self-developed 3D graphics software, users can arbitrarily control the viewing angle and azimuth angle, rotate the 3D waveform, observe any position of the magnetic field, and find the defect position. It is a holographic visual magnetic field test equipment, and the refresh speed is at the leading level in the same industry).
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