The transformer core is not a single iron core, but a thin silicon steel sheet laminated. The purpose of this is to increase the resistance in the iron core, reduce the eddy current in the iron core, improve the efficiency of the transformer, use a whole iron core, generate eddy current, burn the winding, so that the transformer can not work.
The transformer core will produce eddy currents, that is, annular currents are generated inside the core, which both loses electrical energy and causes the transformer to heat up causing inconvenience and affecting performance safety, so the smaller the eddy current, the better. One of the ways to reduce eddy current is to change the whole iron core into lamination, which can effectively reduce eddy current. Refer to the diagram, the entire iron core has the shortest eddy path, so the resistance is minimal and the current is maximum. The total vortex path of the wafer core is longer, so the current is reduced.
C In order to increase the magnetic induction intensity, an iron core is used in the transformer, and the iron core will be generated when the alternating current passes through the coil of the transformerLarge eddy currents not only lose a lot of energy but may even burn these devices. In order to reduce the eddy current and its loss, the whole iron core is usually replaced by a laminated silicon steel sheet, and the silicon steel sheet plane is parallel to the magnetic induction line.
Silicon is a semiconductor and, yes, none of its semiconductor properties are used here. However, the addition of this element can improve the magnetic conductivity, coated with insulation material, and stacked together in order to make the entire core from a macro point of view is an insulator, to avoid the induction of eddy current consumption of electric energy.
Silicon steel has high permeability, and using silicon steel as transformer core can greatly reduce the production of transformer excitationThe resulting hysteresis loss. The lamination is used because the lamination can reduce the eddy current loss caused by excitation. 3. If it is not painted and the sheets are stacked together to form a whole, there will be no effect of 2. So...
First of all, because the magnetic permeability of silicon steel is good, so the choice of silicon steel. It is stacked one piece at a time to reduce the eddy current loss of the core. Because there are some more complex calculation formulas, and involve some professional knowledge, so directly say the two purposes of doing so. Generally speaking, knowing these two purposes is enough to use.
Because talc can carve white marks on the rough ground, talc is also made into a talc pencil, which can write on the cement floor. Use of talc pencil: steel plate marking, known as dust-free chalk. Talc pencil features: fire does not fade, clear lines. Scope of use: machinery manufacturing, vehicle manufacturing, shipping, steelIron works, etc.
In the field of cosmetics, talc is used to make products such as skin powders, beauty powders and talcum powders. In medicine, it is used in tablets, powder, sugar coating, anti-stick agent, etc., but also used in food additives. In the coating industry, talc is an important part of white pigment and coating. It is used as a filler in the paper and plastics industries. In the rubber and cable industries, talc is used as an additive and isolator.
hobby UK [hbi] US [h alpha bi]]. n. Hobbies. Angling is his main hobby. Angling is his main hobby. flower. English [fla (r)] American [flar]. n. flowers; Flowering plants; Essence; Heyday. v. blossom; Mature; Decorate with flowers.
New Target English eighth grade Volume 1 Word list Word List: abandon ability able about above abroad absent abuse access accident 1achieve …… abandon - means to give up or abandon. This is an important verb, often used to express a decision or necessity.
Unit 1 to 5 I will answer 1 answer # Hot topic # As a woman, have you ever felt "insecure" in your life? tailuowang recommended on 2017-11-22 · Know partner education expert tailuowang know partner education expert number of adoption: 36339 Number of likes: 276352 Graduated from the English Department of Jiangxi Ji 'an Normal College (Jinggangshan University).
Memory of the eighth grade volume of English words, for many junior high school students is a headache, the following is my collated content, for your reference.
Impurity pressure Impurities also affect the electrical conductivity of a substance. Adding a small amount of impurities to a pure semiconductor material can significantly improve its electrical conductivity. Although pressure has little effect on the electrical conductivity of gases and liquids, it can change the electrical conductivity of metals. At high pressure, the electrical conductivity of the metal is reduced because high pressure compresses the lattice structure and reduces the number of free electrons.
is affected by other factors such as temperature, concentration, the addition of other ions such as,When the concentration is equal, the degree of ionization of acetic acid is greater than that of carbonic acid, which is mainly due to its own factors. Dilute acetic acid is more ionized than concentrated acetic acid, which is the concentration. If you increase the temperature, promote ionization, because ionization is heat-absorbing, and if you add hydrochloric acid to acetic acid, it will inhibit the ionization of acetic acid.
In addition to superconductivity, the most conductive metal element is silver. Conductivity is also temperature-dependent. Silver is one of the transition metals. The chemical symbol Ag. Silver is one of the metals known and used in ancient times, and is an important precious metal.The electrical conductivity of various metals varies, usually silver is the best, followed by copper and gold.
Junior high school requirements to master the factors affecting resistance: conductor length, material is the same, the larger the cross-sectional area, the smaller the resistance; When the cross-sectional area and material of conductor are the same, the longer the conductor length, the greater the resistance; When the cross-sectional area and length of the conductor are the same, the material of the conductor is different, and the resistance is different. The resistance of most metals increases with increasing temperature.
Therefore, the conductivity is much lower than that of water containing impurity ions such as tap water. The pH of water: The pH of water will directly affect the concentration and concentration of ions in waterThe type, thus affecting the conductivity of water. Water pressure: The faster the water flows, the faster the ions move with the water flow, resulting in an increase in the conductivity of the water. In short, the conductivity of water is affected by a variety of factors, if you need to measure the conductivity of water, you need to consider the above factors.
1. Panasonic. The Ningde era. Byd. China Innovation Aviation. Guo Xuan Gao Ke. 100 million latitude lithium energy. Shinwanda. Funeng Technology. LG Chem. Samsung SDI.
2, what are the brands of carbon batteries:Shuanglu brand carbon battery in our lives is not unfamiliar, not only good quality, and the price is not expensive, a 5 or 7 of the double deer battery, the price is only 6 yuan, Shuanglu battery is a mercury-free carbon battery, and also has an explosion-proof structure.
3, lithium battery ranking recommended brands are: Ningde times, BYD, LG Chemical, Panasonic, Guoxun High-tech. Ningde Times: is the world's leading new energy innovative technology company, power battery usage for many years in the world's top. The brand focuses on the research and development, production and sales of new energy vehicle power battery systems, energy storage systems, and lithium battery technologyThere is a profound accumulation of.
4, ranked seventh lithium battery manufacturer - Shenzhen Waterma Battery Co., Ltd. was founded in 2002, located in Pingshan New District, Shenzhen, China. Shenzhen Watma Battery Co., Ltd. is one of the first lithium iron phosphate battery enterprises in China to successfully develop lithium iron phosphate new energy vehicle power battery, automotive starting power supply, energy storage system solutions and take the lead in realizing large-scale production and batch application.
1, the cardboard zinc-manganese battery due to the difference in formula composition caused by different electrical properties, and is divided into C-type cardboard battery (carbon-zinc battery), also known as high-capacity battery; P-type cardboard battery (zinc chloride battery), also known as high power battery. The dry batteries in the general supermarket or retail market are such batteries, which are marked as Super Heavy Duty. 2, the physical and chemical characteristics of lithium-ion batteries are mainly high energy density and high voltage, widely used in variousIndustry, and gradually increase production. Lithium-ion batteries are divided into polymer electrolytes and liquid electrolytes, which are higher in energy, lighter in weight, and less polluting than other batteries. Nickel-metal hydride batteries have the advantage of safety and reliability, but they also have the problem of low energy density, which is mainly used in hybrid models.
3, it is also a mature electric vehicle battery, it has good reliability, easy access to raw materials, cheap price; The specific power can basically meet the power requirements of electric vehicles. But it has two big drawbacks; First, the specific energy is low, the mass and volume accounted for are too large, and the driving distance of a single charge is short; Another is short service lifeThe use cost is too high.
4, nickel-metal hydride battery: nickel-metal hydride battery is alkaline battery, nickel-metal hydride battery cycle life is long, no memory effect, but the price is higher. Lithium-ion battery: Lithium-ion secondary battery as a new type of high voltage, high energy density rechargeable battery, its unique physical and electrochemical properties, has a wide range of civil and defense applications in the future.