How to detect the magnetic core of high frequency transformer?
How to detect the magnetic core of high frequency transformer? Buy high frequency transformer core, are afraid to buy A cargo, so how to reduce
fall risk, it is need to understand some of the high-frequency transformer magnetic core detection method, the next king lai technology engineer
to introduce the high-frequency transformer under how to detect magnetic core:
To detect the magnetic core of high frequency transformers, it is necessary to understand: what are the common magnetic core materials of high
frequency transformers? If you are interested, you can go and have a look
There are many kinds of soft magnetic materials for magnetic measurement of soft magnetic materials. Because of the use of different occasions,
the parameters to be measured are very complex; There are many measurements and methods of the same parameter, which is the most important part
of magnetic energy measurement.
一、Measurement of dc magnetic properties
Tributary parameters of soft magnetic materials have different testing requirements according to the material. For electric pure iron and silicon
steel, there are mainly amplitude-value magnetic induction strength Bm under standard magnetic field strength, for exampleB5、B10、B20、B50、B100Such
measurements, as well as the maximum magnetic conductivity, can be obtained with respect to Hc, etc.
For permo alloy and amorphous, the initial magnetic conductivity is. For soft magnetic ferrite materials; Let's say I, let's say m, Bs, Br and so on
It is obvious that the use of materials can be well controlled as long as the magnetic characteristic parameters of materials can be measured under closed
circuit conditions (partial materials can be measured by open-circuit method). The most common methods:
1、Impact method: Epstein square ring, pure iron bar, weak magnetic material and amorphous strip can be used for the silicon steel, and other samples can
be tested as long as they can be processed into closed magnetic ring. The test sample requires strict demagnetization to neutral state.
Using reversing dc power and impact galvanometer to keep a record of each test point by calculating and Bi on the graph paper, Hi, get the corresponding
parameters of the magnetic properties, widely used before the 90 s, production equipment has:：CC1、CC2和CC4。
This kind of instrument test method is classic, the test is stable and reliable *, the price of the instrument is relatively cheap, and it is easy to repair.
The disadvantage is that the requirements for testers are quite high, and the point-by-point testing work is quite heavy. The slow speed and pulse non-instantaneous
time error are hard to overcome.
2. Coercivity meter method: it is a measurement method specially designed for pure iron bar, and it is only a parameter of Hcj of measuring material. The test market
magnetized the samples to saturation and then reversed the magnetic field. In a magnetic field, pull the cast coil or sample out of the solenoid
External impact galvanometer deflection, the corresponding Hcj reverse magnetic field is the sample, the measurement method can very good Hcj measuring of materials,
equipment investment is small, practical, and there is no requirement on the shape of the material.
3. Dc hysteresis loop meter method: the test principle is the same as that of permanent magnetic materials. It is mainly due to greater efforts in integrator. There
are many kinds of integrators, such as photoelectric amplification ct integral, resistance capacitance integral, v-f conversion integral and electronic sampling integral
In the form of. Domestic equipment has Shanghai four table factory: CL1, cl6-1, CL13; The foreign equipment includes yokogawa 3257, LDJ's AMH401 and so on. Compared with
the foreign integrator, the level is much higher than the domestic level, and the control accuracy of b-speed feedback is also very high. This method tests the speed
Fast, intuitive results, easy to use. The disadvantage is that the test data for both the I and the le is not correct, usually more than 20%.