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Description of the magnetic distribution measurement diagram of the multipole magnetic ring surface
Release time:
2020-11-04
Source:
Www.fe2100.com Hunan Yongyi Technology Co., Ltd.
The FE-2100R-type surface magnetic distribution measuring device series equipment is an indispensable tool for correct evaluation of magnet magnetizing accuracy and magnetic ring quality inspection. The following is an explanation of Ding Jiaquan of Hunan Yongyi Science and Technology Co., Ltd. for the surface magnetic distribution measurement chart of multi-pole magnetic ring. It is convenient for customers to use our FE-2100R type table magnetic distribution measurement series products more portable.
FE-2100R typeTable Magnetic Distribution MeasurementThe device series equipment is an indispensable tool for the correct evaluation of the magnetizing accuracy of the magnet and the quality inspection of the magnetic ring. The following is the aim of Ding Jiaquan of Hunan Yongyi Technology Co., Ltd. for multipolar magnetic ringsTable Magnetic Distribution Measurement ChartThe description of. Convenient for customers to use our FE-2100R model more portableTable Magnetic Distribution MeasurementSeries of products.
multipole magnetic ringTable Magnetic Distribution MeasurementGraphs include Cartesian plots, polar plots, and harmonic analysis. The following is an example of a multi-pole magnetic ring.
The Cartesian diagram is shown below:
The magnetic force area refers to the area enclosed between the magnetic induction waveform of each magnetic pole and the angular coordinate. The unit is T * deg (tesla x angle). The physical meaning is expressed as the integral of the magnetic induction over the angle.
Half width (deg) refers to the number of degrees between the 50% peak pointing of each pole.
The angle refers to the degree of the vertex of each pole relative to the starting zero point of the pole.
The pole width (deg) refers to the number of degrees between the start zero and the end zero of each pole.
The duty cycle refers to the ratio of the full width at half maximum to the average extreme width.
Average, Maximum, Minimum, Standard Deviation Peak Difference: Calculated separately for all N and S poles in the test report.
Cumulative error is calculated for each parameter based on its maximum and minimum values, cumulative error = 100 x (maximum-minimum)/minimum value.
The polar chart is shown below:
Polar coordinates refer to taking a fixed point O in the plane, called the pole, leading a ray Ox, called the polar axis, and then selecting a length unit and the positive direction of the angle (usually counterclockwise). For any point m in the plane, ρ is used to represent the length of the line segment OM (sometimes also R),θ is used to represent the angle from Ox to OM, ρ is called the polar diameter of the point m, θ is called the polar angle of the point m, and the ordered number pair (ρ,θ) is called the polar coordinate of the point m. the coordinate system thus established is called the polar coordinate system. In general, the polar diameter coordinate unit of M is 1 (length unit), and the polar angle coordinate unit is rad (or °).
The polar coordinate diagram can be obtained by the following transformation of the rectangular coordinate diagram.
The polar plot is closer to the shape of a multipolar magnetic ring, with petals representing each pole, and N,S spaced apart. Just N,S does not distinguish.
The harmonic analysis is shown in the following figure:
The harmonic analysis diagram is obtained from the sine function or cosine function diagram of the rectangular coordinate diagram.
According to the principle of Fourier series, a periodic function can be expanded as the sum of a constant and a set of sine and cosine functions with a common period.
In its expansion, the part expressed by the constant is called the DC component, the part with the minimum positive period equal to the period of the original function is called the fundamental wave or the first harmonic, and the part with several times of the minimum positive period equal to the period of the original function is called the higher harmonic.
Therefore, the frequency of higher harmonics must also be equal to several times the frequency of the fundamental wave. Waves with 3 times the frequency of the fundamental wave are called third harmonics, waves with 5 times the frequency of the fundamental wave are called fifth harmonics, and so on. No matter how many harmonics, they are sine waves.
The first harmonic is also called the fundamental wave, and more than 2 times are high harmonics. For the motor, higher harmonics will make the motor run unevenly, noise, more heat and so on.
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