ebm-papst electrical components Germany ebm-papst model ebm-papst price

ebm-papst electrical components are resistive elements with three terminals, whose resistance can be adjusted according to a specific variation law. A potentiometer typically consists of a resistive element and a movable wiper. When the wiper moves along the resistive element, a resistance value or voltage related to the displacement is obtained at the output terminal. Potentiometers can be used as three-terminal components or as two-terminal components. The latter can be regarded as a variable resistor; since its role in the circuit is to obtain an output voltage that has a certain relationship with the input voltage (applied voltage), it is called a potentiometer. A potentiometer is a type of variable resistor. It usually consists of a resistive element and a rotating or sliding system, i.e., a moving contact moves on the resistive element to obtain a partial voltage output. The function of a potentiometer is to adjust voltage (including DC voltage and signal voltage) and current magnitude. Structural features of potentiometers: The resistive element of a potentiometer has two fixed terminals. By manually adjusting the shaft or slider, the position of the moving contact on the resistive element is changed, thereby changing the resistance value between the moving contact and any fixed terminal, thus changing the magnitude of voltage and current. A potentiometer is an adjustable electronic component. It consists of a resistive element and a rotating or sliding system. When a voltage is applied across the two fixed contacts of the resistive element, changing the position of the contact on the resistive element via the rotating or sliding system yields a voltage between the moving contact and the fixed contact that is related to the position of the moving contact. It is mostly used as a voltage divider, in which case the potentiometer is a four-terminal component. A potentiometer is essentially a sliding rheostat, available in several styles, generally used for speaker volume control and laser head power adjustment. A potentiometer is an adjustable electronic component. It is a variable resistor used for voltage division. On the exposed resistive element, one or two movable metal contacts are pressed firmly. The contact position determines the resistance between either end of the resistive element and the contact. Classified by material: wire-wound, carbon film, and solid-core potentiometers; classified by the relationship between output-to-input voltage ratio and rotation angle: linear potentiometers (linear relationship) and functional potentiometers (curvilinear relationship). Main parameters include resistance value, tolerance, and rated power. Widely used in electronic equipment, such as for volume control in audio systems and receivers.

ebm-papst electrical component principle

When two different conductors or semiconductors A and B form a loop with their ends connected, as long as the temperatures at the two junctions are different, with one junction at temperature T (called the working end or hot end) and the other at temperature T0 (called the free end or cold end), an electromotive force (EMF) is generated in the loop. The direction and magnitude of this EMF depend on the materials of the conductors and the temperatures of the two junctions. This phenomenon is called the "thermoelectric effect," the loop formed by the two conductors is called a "thermocouple," the two conductors are called "thermoelectrodes," and the generated EMF is called "thermoelectric EMF." Thermoelectric EMF consists of two parts: the contact EMF between the two conductors and the temperature difference EMF within a single conductor. The magnitude of the thermoelectric EMF in a thermocouple loop depends only on the conductor materials forming the thermocouple and the temperatures of the two junctions, and is independent of the shape and dimensions of the thermocouple. Once the materials of the two thermocouple electrodes are fixed, the thermoelectric EMF is a function of the difference between the junction temperatures t and t0. This relationship is widely used in practical temperature measurement. Since the cold end t0 is constant, the thermoelectric EMF generated by the thermocouple changes only with the temperature of the hot end (measurement end), meaning a specific thermoelectric EMF corresponds to a specific temperature. We can achieve temperature measurement by measuring the thermoelectric EMF. The basic principle of thermocouple temperature measurement is that a closed loop formed by two conductors of different compositions generates a current when there is a temperature gradient between the ends, resulting in an EMF—thermoelectric EMF—between the ends, known as the Seebeck effect. Two homogeneous conductors of different compositions serve as thermoelectrodes; the higher-temperature end is the working end, and the lower-temperature end is the free end, which is usually maintained at a constant temperature. Based on the functional relationship between thermoelectric EMF and temperature, thermocouple reference tables are created; these tables are derived under the condition that the free end temperature is 6°C, and different thermocouples have different reference tables. When a third metal material is introduced into the thermocouple loop, as long as the temperatures at the two junctions of this material are the same, the thermoelectric potential generated by the thermocouple remains unchanged, i.e., it is unaffected by the introduction of the third metal. Therefore, during thermocouple temperature measurement, a measuring instrument can be connected; after measuring the thermoelectric EMF, the temperature of the measured medium can be determined. Thermocouple temperature measurement requires the cold end temperature (the end connected to the measurement circuit via lead wires, while the measurement end is the hot end) to remain constant, so that the thermoelectric potential is proportional to the measured temperature. If the cold end (ambient) temperature changes during measurement, it will seriously affect measurement accuracy. Taking measures at the cold end to compensate for the effects of cold end temperature changes is called thermocouple cold junction compensation. Dedicated compensation cables are used to connect to the measuring instrument. Thermocouple cold junction compensation calculation methods: (1) From millivolts to temperature: Measure the cold end temperature, convert it to the corresponding millivolt value, add it to the thermocouple's millivolt value, and convert to temperature; (2) From temperature to millivolts: Measure the actual temperature and the cold end temperature, convert both to millivolt values, subtract them to obtain the millivolt value, and thus determine the temperature.

ebm-papst electrical component principle

A varactor diode is a special type of diode. When forward bias is applied, a large current flows, the depletion region of the PN (positive-negative) junction narrows, capacitance increases, producing a diffusion capacitance effect; when reverse bias is applied, a transition capacitance effect occurs. However, since leakage current occurs under forward bias, reverse bias is generally applied in applications. A varactor diode, also known as a voltage-controlled variable capacitor, is a semiconductor whose junction capacitance changes according to the applied voltage. In other words, as a variable capacitor, it can be applied in resonant circuits such as FM tuners and TV tuners, and in FM modulation circuits. We can view it as a PN junction. If a reverse voltage V is applied to the PN junction (varactor diodes are used in reverse), electrons in the N-type semiconductor are drawn toward the positive electrode, and holes in the P-type semiconductor are drawn toward the negative electrode, forming a depletion layer with neither electrons nor holes. Let the width of this depletion layer be d, which varies with the reverse voltage V. Thus, as the reverse voltage V increases, the depletion layer d widens, and the diode's capacitance C decreases (according to C=kS/d); conversely, as the reverse voltage decreases, the depletion layer width d narrows, and the diode's capacitance increases. Changes in reverse voltage V cause changes in the depletion layer, thereby altering the junction capacitance C of the voltage-controlled variable capacitor, achieving the desired effect. Varactor diodes are semiconductor devices made based on the principle of variable capacitance across the PN junction, used as variable capacitors in high-frequency tuning, communication, and other circuits. Varactor diodes come in various package forms, including glass encapsulation (glass-sealed), plastic encapsulation (plastic-sealed), metal casing encapsulation (metal-sealed), and leadless surface mount packages. Typically, low-to-medium power varactor diodes use glass, plastic, or surface mount packages, while higher-power varactor diodes mostly use metal-sealed packages. Common varactor diode parameters.

ebm-papst electrical component structure

1. Liquid crystal panel: The liquid crystal panel includes a polarizing film, glass substrates, black matrix, color filters, protective film, common electrodes, alignment layer, liquid crystal layer (liquid crystal, spacers, sealant), capacitors, display electrodes, prism layer, and light-diffusing layer. The polarizing film is also known as a polarizer; polarizers are divided into upper and lower polarizers. The polarization functions of the upper and lower polarizers are perpendicular to each other. They act like a fence, blocking light wave components as required; for example, they block light wave components perpendicular to the polarizer fence and only allow light wave components parallel to the fence to pass through. 2. Glass substrate: In liquid crystal displays, glass substrates are divided into an upper substrate and a lower substrate. Their main function is to hold the liquid crystal material in the space between the two substrates. The material for glass substrates is generally alkali-free borosilicate glass with excellent mechanical properties, heat resistance, and chemical corrosion resistance. For TFT-LCD, one glass substrate is distributed with TFT, while the other glass substrate is deposited with color filters. 3. Black matrix: The black matrix uses materials with high light-shielding performance to separate the three primary colors (red, green, and blue) in the color filters (to prevent color mixing) and to prevent light leakage, thereby helping to improve the contrast of each color block. In addition, in TFT-LCD, the black matrix can also conceal internal electrode wiring or thin-film transistors. Color filters, also known as color filter films, function to generate 3 primary colors of light (red, green, and blue), enabling full-color display on the liquid crystal display. 4. Alignment film: The alignment film, also known as an orientation film or alignment layer, functions to enable uniform arrangement and orientation of liquid crystal molecules at the microscopic level. 5. Transparent electrodes: Transparent electrodes are divided into common electrodes and pixel electrodes. The input signal voltage is applied between the pixel electrode and the common electrode. Transparent electrodes are typically formed by depositing indium tin oxide (ITO) material on the glass substrate to create a transparent conductive layer. 6. Liquid crystal material: In LCD, the liquid crystal material acts like a light valve, controlling the brightness of transmitted light to achieve information display. 7. Driver IC: The driver IC is essentially a set of integrated circuit chip devices used to adjust and control the phase, peak value, frequency, and other parameters of the potential signals on the transparent electrodes, establishing a driving electric field to ultimately realize information display on the liquid crystal panel. In liquid crystal panels, active-matrix liquid crystal displays are constructed by sealing twisted nematic (TN) liquid crystal material between two glass substrates. The upper glass substrate (closer to the display screen) is deposited with red, green, and blue (RGB) tricolor color filters (also known as color filter films), a black matrix, and a common transparent electrode. The lower glass substrate (the substrate farther from the display screen) is equipped with thin-film transistor (TFT) devices, transparent pixel electrodes, storage capacitors, gate lines, signal lines, etc. Alignment films (or alignment layers) are prepared on the inner sides of the two glass substrates to orient the liquid crystal molecules. Liquid crystal material is injected between the two glass substrates, and spacers are dispersed to ensure uniform gap thickness. The periphery is bonded with frame sealant for sealing purposes; the common electrodes of the upper and lower glass substrates are connected using silver dot adhesive processes. Polarizers (or polarizing films) are attached to the outer sides of the upper and lower glass substrates, respectively. When a voltage is applied between the pixel transparent electrode and the common transparent electrode, the alignment state of the liquid crystal molecules changes. At this time, the intensity of incident light passing through the liquid crystal also changes. Liquid crystal displays utilize the optical rotation property of the liquid crystal material, combined with electric field control, to achieve information display. 8. Backlight module: LCD products are non-emissive electronic devices that do not possess inherent light-emitting characteristics. They must rely on light emission from the source in the backlight module to achieve display performance; therefore, the brightness of LCD is determined by its backlight module. Thus, the performance of the backlight module directly affects the display quality of the liquid crystal panel. The backlight module includes illumination light sources, reflectors, light guide plates, diffusion sheets, brightness enhancement films (prism sheets), and frames. Backlight modules used in LCD can be mainly divided into two categories: edge-lit backlight modules and direct-lit backlight modules. Mobile phones, laptops, and monitors (15 inches) mainly use edge-lit backlight modules, while LCD TVs mostly use direct-lit backlight module light sources. Cold cathode fluorescent lamps and light-emitting diodes are the primary backlights for LCD. 9. Reflector: The reflector, also known as a reflection cover, mainly functions to direct all light emitted by the light source into the light guide plate, minimizing unnecessary loss as much as possible. 1. Light guide plate: The main function of the light guide plate is to guide light from the side light source to the front of the panel. 11. Prism sheet: The prism sheet, also known as a brightness enhancement film, mainly functions to concentrate scattered light through refraction and total reflection within the film layer, emitting it from the backlight source at specific angles to achieve a screen brightening effect.15. Diffuser Sheet: The main function of the diffuser sheet is to correct the edge-lit light from the backlight module into a uniform surface light source, achieving optical diffusion. Diffuser sheets are categorized into upper and lower diffuser sheets. The upper diffuser sheet is located between the prism sheet and the LCD assembly, closer to the display panel. The lower diffuser sheet is located between the light guide plate and the prism sheet, closer to the backlight source.

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