60/4/5 in stock German 60/4/5 electrical components 60/4/5 inventory

60/4/5 Electrical components refer to mechanical equipment that converts mechanical energy into electrical energy. They are driven by hydraulic turbines, steam turbines, diesel engines, or other prime movers, converting the energy from water flow, air flow, fuel combustion, or nuclear fission into mechanical energy transmitted to the generator, which then converts it into electrical energy. Generators are widely used in industrial and agricultural production, national defense, science and technology, and daily life. There are many types of generators, but their operating principles are all based on the laws of electromagnetic induction and electromagnetic force. Therefore, the general principle of their construction is to use appropriate magnetic and conductive materials to form magnetic circuits and circuits that mutually induce electromagnetism, thereby generating electromagnetic power to achieve energy conversion.

60/4/5 Electrical component principle

A Schottky diode is a metal-semiconductor device made using noble metals (gold, silver, aluminum, platinum, etc.) A as the anode and N-type semiconductor B as the cathode, utilizing the rectifying characteristics of the barrier formed at their contact interface. Because there are a large number of electrons in the N-type semiconductor and only a very small number of free electrons in the noble metal, electrons diffuse from the high-concentration B to the low-concentration A. Obviously, there are no holes in the metal A, so there is no diffusion movement of holes from A to B. As electrons continuously diffuse from B to A, the electron concentration on the surface of B gradually decreases, destroying surface electrical neutrality and forming a barrier with an electric field direction of B → A. However, under the influence of this electric field, electrons in A also produce a drift motion from A → B, thereby weakening the electric field formed by the diffusion motion. When a space charge region of a certain width is established, the electron drift motion caused by the electric field and the electron diffusion motion caused by the concentration difference reach a relative balance, forming a Schottky barrier. The internal circuit structure of a typical Schottky rectifier uses N-type semiconductor as the substrate, on which an N-epitaxial layer doped with arsenic is formed. The anode uses materials such as molybdenum or aluminum to form a barrier layer. Silicon dioxide is used to eliminate the electric field in the edge region and increase the voltage resistance of the diode. The N-type substrate has a very small on-state resistance, and its doping concentration is 110% times higher than that of the H-layer. An N+ cathode layer is formed under the substrate to reduce the contact resistance of the cathode. By adjusting structural parameters, a Schottky barrier is formed between the N-type substrate and the anode metal.

60/4/5 Electrical component characteristics

Operating characteristics: The main characteristics characterizing the performance of a synchronous generator are the no-load characteristic and the load operating characteristic. These characteristics are an important basis for users to select generators. No-load characteristic: When the generator is not connected to a load, the armature current is zero, which is called no-load operation. Armature reaction: When the generator is connected to a symmetrical load, the three-phase current in the armature winding produces another rotating magnetic field, called the armature reaction magnetic field. Its speed is exactly equal to the rotor speed, and both rotate synchronously. The armature reaction magnetic field of a synchronous generator and the rotor excitation magnetic field can both be approximately considered to be distributed according to a sinusoidal law. The spatial phase difference between them depends on the time phase difference between the no-load electromotive force E4 and the armature current I. The armature reaction magnetic field is also related to the load condition. When the generator load is inductive, the armature reaction magnetic field has a demagnetizing effect, causing the generator voltage to decrease; when the load is capacitive, the armature reaction magnetic field has a magnetizing effect, causing the generator output voltage to increase. Load operating characteristics: Mainly refer to external characteristics and adjustment characteristics. The external characteristic is the relationship between the generator terminal voltage U and the load current I when the speed is at the rated value, and the excitation current and load power factor are constant. The adjustment characteristic is the relationship between the excitation current If and the load current I when the speed and terminal voltage are at rated values, and the load power factor is constant.

60/4/5 Electrical component structure

The simplest switch has two pieces of metal called "contacts." When the two contacts touch, they complete the current circuit; when they do not touch, the current circuit is open. When selecting contact metal, its resistance to corrosion must be considered, because most metals form insulating oxides after oxidation, preventing the contacts from working properly. When selecting contact metal, factors such as electrical conductivity, hardness, mechanical strength, cost, and toxicity must also be considered. Sometimes, corrosion-resistant metals are plated onto the contacts. This plating is generally applied to the contact surfaces to avoid performance degradation due to oxides. Sometimes, non-metallic conductive materials, such as conductive plastics, are also used for the contact surfaces. In addition to contacts, switches have movable parts that make or break the contact. Switches can be classified into lever switches, push-button switches, rocker switches, etc., based on the different movable parts, and the movable parts can also be other types of mechanical linkages.

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