People who bought a mobile phone like to study the parameters of the new mobile phone, although they have seen it before buying it.
Most of the above parameters can be understood, but some are half-baked. For example, the old monster sees the word "Hall sensor" is a bit aggressive, what is this ghost? What is the use?
What is a Hall sensor?The Hall sensor is a magnetic field sensor fabricated according to the Hall effect. The Hall effect is a kind of magnetoelectric effect. This phenomenon was discovered when the cattle named Hall were studying the conductive mechanism of metal in 1879.
Well, as an non-science student, not a schoolmaster, please allow me to simply understand the Hall effect as the interaction of "magnetic field" and "electricity."
Is the Hall sensor useful on mobile phones?It doesn't matter if we don't understand the principle. We just need to know that it works. Just like Qian Zhongshu said: "The egg is delicious, but there is no need to know the old hen who lays the egg."
Its role is the Hall switch, which can make our mobile phone case smart, the specific effect is to open the bright screen and close the black screen.
In fact, this is not a new thing, because the clamshell machine used this feature frequently, and of course it is also available on tablets.
In short, if the mobile phone has a Hall sensor, as long as a magnet is built in the holster, the above functions can be achieved, and most of the smart machines currently have Hall sensors.
There are a lot of reasons. First of all, we only need to tell the user that there is a "smart sleep" function. It is not necessary to introduce it in a special and professional way. It will be confusing to the user when it is not well introduced, and it is not as important as the CPU and camera. So I am not willing to promote this.
In addition, is it worried that the media/netizens are worried about radiation, harmful to health, and so on?
In fact, the main role of the Hall sensor (also called the magnetic field sensor) is to detect the geomagnetic field and realize the compass function. The Hall switch is only a supplementary function.
Mine general transformer
It is used in the mine where there is coal dust and methane but no explosion danger, for electric drive and lighting. This transformer is oil immersed. Its internal structure and working principle are the same as those of ordinary oil immersed power transformer. The main difference is the housing and the inlet and outlet devices.
The mining general transformer has a firm structure and low appearance. There is no oil conservator on the upper part of the transformer, and proper space is left on the oil level in the oil tank to prevent excessive pressure in the oil tank when the vent on the tank cover is blocked. The mechanical strength of the oil tank can withstand the pressure of 0.1 MPa without permanent deformation. The high and low voltage incoming and outgoing lines of the mining transformer are all cable junction boxes filled with insulating glue.
The capacity of mining general transformers is 50, 100, 180, 320 KVA, etc. Non excitation voltage regulation is set at the primary side of the transformer, and the voltage regulation range is ± 5%; Six terminals are led out from the secondary side coil, which can be Y/△ connected to obtain 690/400V or 1200/690V.
Mine flameproof transformer
It is used in places with explosion risk in mines. This type of transformer is mostly made of dry type, and its main structural feature is that all the joint surfaces of the box shell are made according to the requirements of explosion-proof, and can withstand the internal pressure of 0.8 MPa.
The capacity of dry-type transformer for mining is generally 4 KVA and 2.5 KVA, which are specially used to supply power for electric drill, lighting, signal and other equipment. Its incoming and outgoing lines are led out by cables through outlet sleeves. There are 380 V and 660 V voltages on the primary side; The secondary side voltage is generally 133 V.
Satons flameproof transformer with a capacity of more than 100 KVA is often combined with flameproof switch box to form a complete set of flameproof mobile substation. Its output voltages are 400V, 690V and 1200V to meet the needs of mine electrical equipment. In order to adapt to tunnel transportation, the transformer structure height should be low. In this way, the iron column diameter can be larger, and cold rolled silicon steel sheets are generally used. 100 KVA and above are usually Class H insulation.
Mining transformers,Explosion-proof transformer,Mine general transformer
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