kelectric electrical components German kelectric models kelectric prices

kelectric electrical components are instruments used to transform voltage. However, the purpose of a transformer in transforming voltage is to facilitate power transmission, so its capacity is large, generally calculated in kilovolt-amperes or megavolt-amperes; whereas the purpose of a voltage transformer in transforming voltage is mainly to supply power to measuring instruments and relay protection devices, to measure line voltage, power, and energy, or to protect valuable equipment, motors, and transformers in the line when a fault occurs. Therefore, the capacity of a voltage transformer is very small, generally only a few volt-amperes or tens of volt-amperes, with the maximum not exceeding one thousand volt-amperes.

kelectric electrical component classification

Depending on the motor's operating power supply, motors can be classified into DC motors and AC motors. Among these, AC motors are further divided into single-phase motors and three-phase motors. Based on structure and operating principle, motors can be classified into DC motors, asynchronous motors, and synchronous motors. Synchronous motors can be further divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors. Asynchronous motors can be divided into induction motors and AC commutator motors. Induction motors are further divided into three-phase asynchronous motors, etc. single-phase asynchronous motors and shaded-pole asynchronous motors, etc. AC commutator motors are further divided into single-phase series-wound motors, universal AC/DC motors, and repulsion motors. Based on starting and running methods, motors can be classified into capacitor-start single-phase asynchronous motors, capacitor-run single-phase asynchronous motors, capacitor-start-run single-phase asynchronous motors, and split-phase single-phase asynchronous motors. Based on application, motors can be classified into drive motors and control motors. Drive motors are further divided into motors for power tools, motors for home appliances, and motors for other general small mechanical equipment. Control motors are further divided into stepper motors and servo motors, etc. Based on rotor structure, motors can be classified into squirrel-cage induction motors and wound-rotor induction motors. Based on operating speed, motors can be classified into high-speed motors, low-speed motors, constant-speed motors, and variable-speed motors.

kelectric electrical component principles

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 surface. 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, thus forming a barrier whose electric field direction is B → A. However, under the action of this electric field, electrons in A also produce a drift movement from A → B, thereby weakening the electric field formed by the diffusion movement. After a space charge region of a certain width is established, the electron drift movement caused by the electric field and the electron diffusion movement 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, increasing the withstand voltage of the tube. The N-type substrate has a very small on-state resistance, and its doping concentration is 101% 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.

kelectric electrical component parameters

(1) Rated operating voltage: refers to the voltage required by the coil for the relay to work normally. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured with a multimeter. (3) Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal use, the given current must be slightly greater than the pull-in current so that the relay can work stably. For the operating voltage applied to the coil, it generally should not exceed the rated operating voltage; otherwise, a large current will be generated, burning out the coil. (4) Release current: refers to the maximum current at which the relay performs the release action. When the current in the pull-in state of the relay decreases to a certain level, the relay will return to the de-energized release state, at which point the current is much smaller than the pull-in current. (5) Contact switching voltage and current: refer to the voltage and current that the relay is allowed to load. It determines the magnitude of voltage and current that the relay can control. This value must not be exceeded during use; otherwise, the relay contacts are easily damaged.

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