AMAKO electrical components, German AMAKO models, AMAKO prices

AMAKO electrical components are devices that convert electrical energy into mechanical energy. They utilize energized coils (i.e., stator windings) to generate a rotating magnetic field that acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors based on the power supply used. Most motors in power systems are AC motors, which can be synchronous motors or asynchronous motors (where the speed of the stator magnetic field does not remain synchronized with the rotor rotation speed). A motor mainly consists of a stator and a rotor. The direction of motion of a current-carrying conductor under force in a magnetic field is related to the direction of the current and the direction of the magnetic field lines (magnetic field direction). The working principle of a motor is the force exerted by the magnetic field on the current, causing the motor to rotate.

AMAKO electrical component classification

Plug-in fuses are commonly used at the end of lines for short-circuit protection of distribution branch circuits or electrical equipment. The upper cap of the fuse element in a screw-type fuse has a fuse indicator; once the fuse element melts, the indicator pops out immediately and can be observed through the glass hole on the ceramic cap. It is commonly used in machine tool electrical control equipment. Screw-type fuses. Enclosed fuses are divided into two types: filled fuses and non-filled fuses. Filled fuses generally use square ceramic tubes containing quartz sand and the fuse element, offering high breaking capacity. Non-filled enclosed fuses enclose the fuse element in a sealed cylinder, resulting in slightly lower breaking capacity. Fast-acting fuses are mainly used for short-circuit protection of semiconductor rectifier elements or rectifier devices. Due to the low overload capacity of semiconductor components, they can only withstand large overload currents for extremely short periods, requiring short-circuit protection with fast-acting fusing capabilities. The structure of fast-acting fuses is basically the same as that of filled enclosed fuses, but the fuse element material and shape differ; it uses a silver sheet stamped into a variable cross-section fuse element with V-shaped deep grooves. Fast-acting fuses are commonly referred to as "fast fuses," characterized by fast fusing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small size. Self-resetting fuses use sodium metal as the fuse element, which has high electrical conductivity at room temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates high temperatures that rapidly vaporize the sodium; the gaseous sodium presents a high-resistance state, thereby limiting the short-circuit current. After the short-circuit current disappears and the temperature drops, the sodium metal restores its original good conductivity. Self-resetting fuses can only limit short-circuit current and cannot truly disconnect the circuit. Their advantage is that the fuse element does not need to be replaced, allowing for repeated use.

AMAKO electrical component types

(1) Electron tubes can be classified into voltage amplifier tubes, power amplifier tubes, gas-filled tubes, thyratrons, ignitrons, frequency converter tubes, rectifier tubes, detector tubes, tuning indicator tubes (magic eye), voltage regulator tubes, etc., according to their different applications. (2) Electron tubes can be classified into voltage amplifier tubes, triodes, tetrodes, pentodes, hexodes, heptodes, octodes, nonodes, and composite tubes, etc., according to the different number of electrodes. Tubes with more than three electrodes are also called multi-electrode tubes or multi-grid tubes. (3) Electron tubes can be classified into various types according to their shape and envelope material, such as bottle-shaped glass tubes (ST tubes), "acorn" tubes, cylindrical glass tubes (GT tubes), large glass tubes (G type tubes), metal-ceramic tubes, miniature tubes (also known as peanut tubes or finger tubes, MT tubes), lighthouse tubes (lighthouse tubes), and sub-miniature tubes (pencil tubes). (4) Electron tubes can be classified into single diodes, diodes, double-diode triodes, double diodes, single triodes, power pentodes, beam tetrodes, beam pentodes, dual diodes, diode-pentode composite tubes, beam tetrodes, triode-pentode composite tubes, triode-hexode composite tubes, triode-heptode composite tubes, and beam power tubes, etc., according to their internal structure. (5) Electron tubes can be classified into directly heated cathode electron tubes (current passes directly through the cathode to bring it to thermionic emission state) and indirectly heated cathode electron tubes (the cathode is heated by a filament next to it), according to the heating method of the cathode. (6) Electron tubes can be classified into sharp-cutoff shielded electron tubes and remote-cutoff shielded electron tubes, according to the shielding method. (7) Electron tubes can be classified into water-cooled electron tubes, air-cooled electron tubes, and natural convection-cooled electron tubes, according to the cooling method.

AMAKO electrical component structure

A bipolar junction transistor consists of three differently doped semiconductor regions: the emitter region, the base region, and the collector region. In an NPN type transistor, these regions are N-type, P-type, and N-type semiconductors, respectively, whereas in an PNP type transistor, they are P-type, N-type, and P-type semiconductors, respectively. Each semiconductor region has a lead terminal, usually denoted by the letters E, B, and C for the emitter, base, and collector, respectively. The base is physically located between the emitter and the collector; it is made of lightly doped, high-resistivity material. The collector surrounds the base region. Since the collector-base junction is reverse-biased, it is difficult for electrons to be injected from here into the base region, resulting in a common-base current gain of approximately 12, while the common-emitter current gain achieves a larger value. From the cross-sectional diagram of this typical NPN type bipolar junction transistor on the right, it can be seen that the area of the collector junction is larger than that of the emitter junction. In addition, the emitter has a relatively high doping concentration. Under normal circumstances, the several regions of a bipolar junction transistor are not symmetric in physical properties and geometric dimensions. Assuming the transistor connected in the circuit is in the forward active region, if the connections of the collector and emitter in the circuit are swapped at this time, the transistor will leave the forward active region and enter the reverse active region. The internal structure of the transistor determines that it is suitable for operation in the forward active region, so the common-base current gain and common-emitter current gain in the reverse active region are much smaller than when the transistor is in the forward active region. This functional asymmetry is fundamentally due to the different doping levels of the emitter and the collector. Therefore, in an NPN type transistor, although both the collector and the emitter are N-type doped, their electrical properties and functions are completely interchangeable. The emitter region has the highest doping level, the collector region is next, and the base region has the lowest doping level. In addition, the physical dimensions of the three regions are also different; the base region is very thin, and the collector area is larger than the emitter area. Due to such material structure of the bipolar junction transistor, a reverse bias can be provided for the collector-base junction, provided that this reverse bias is not so large as to damage the transistor. The purpose of heavy doping of the emitter is to increase the efficiency of electron injection from the emitter into the base region, thereby achieving the highest possible current gain. In the common-emitter configuration of a bipolar junction transistor, small changes in the voltage applied across the base and emitter will cause significant changes in the current between the emitter and the collector. Utilizing this property, input current or voltage can be amplified. By treating the base of the bipolar junction transistor as the input terminal and the collector as the output terminal, this two-port network can be analyzed using Thevenin's theorem. Using the principle of equivalence, the bipolar junction transistor can be regarded as a voltage-controlled current source, or it can be viewed as a current-controlled voltage source. In addition, looking into the left side of the two-port network, the input impedance at the base is reduced to the base resistance, thus reducing the requirement for the load capacity of the previous stage circuit.

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