westelettric electrical components Germany westelettric model westelettric price

westelettric electrical components are switches controlled by electromagnets, that is, a combination of an electromagnet and a switch. When the electromagnet coil is energized, it generates electromagnetic attraction, causing the movable iron core to push or pull the switch contacts to close, thereby connecting the controlled circuit. Electromagnetic switches are widely used in various industries, most commonly as contactors in the industrial sector. An electromagnetic switch is the control switch on a starter motor and is one of the three main components of a starter motor (DC motor, transmission engagement mechanism, electromagnetic switch). Its working principle is that the coil generates electromagnetic attraction when energized, causing the movable iron core to move. This action, on one hand, pulls the transmission engagement mechanism to advance the starter pinion gear to engage with the engine flywheel ring gear, and on the other hand, pushes the switch contacts to connect, allowing the DC motor to be energized and operate, thereby driving the engine to start.

westelettric electrical component performance

The performance of fiber optic connectors primarily involves optical performance, but also considers interchangeability, repeatability, tensile strength, temperature resistance, and mating cycles. 1. Optical performance: The main requirements for the optical performance of fiber optic connectors are insertion loss and return loss, which are the two most basic parameters. Insertion loss, also known as connection loss, refers to the loss of effective optical power in the link caused by the introduction of the connector. The lower the insertion loss, the better; generally, it is required to be no greater than 0.5dB. Return loss refers to the connector's ability to suppress the reflection of optical power in the link, and its typical value should be no less than 25dB. For connectors in practical applications, the ferrule surface undergoes specialized polishing treatment, which can result in higher return loss, generally not less than 45dB. 2. Interchangeability and repeatability: Fiber optic connectors are universal passive components. For the same type of fiber optic connector, they can generally be combined arbitrarily and reused multiple times. The additional loss introduced thereby is generally within the range of less than 0.2dB. (3) Tensile strength: For assembled fiber optic connectors, the tensile strength is generally required to be no less than 90N. (4) Temperature: Generally, fiber optic connectors must be able to operate normally at temperatures between -40oC and +70oC. (5) Mating cycles: Most fiber optic connectors in use can withstand more than l007 mating cycles.

westelettric electrical component principle

A varactor diode is a special type of diode. When a forward bias voltage is applied, a large current is generated, the PN (positive and negative poles) junction depletion region narrows, the capacitance increases, producing a diffusion capacitance effect; when a reverse bias voltage is applied, a transition capacitance effect is produced. However, since leakage current occurs when forward bias is applied, reverse bias is supplied in applications. A varactor diode, also known as a voltage-controlled variable capacitor, is a semiconductor that changes its junction capacitance according to the applied voltage variation. That is to say, as a variable capacitor, it can be applied in resonant circuits such as FM tuners and TV tuners, as well as in FM modulation circuits. In fact, we can view it as a PN junction. If a reverse voltage V is applied to the PN junction (since varactor diodes are used in reverse), electrons in the N-type semiconductor are drawn toward the positive pole, and holes in the P-type semiconductor are drawn toward the negative pole, 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 capacitance C decreases (according to C=kS/d); conversely, as the reverse voltage decreases, the depletion layer width d narrows, and the diode capacitance increases. The change in reverse voltage V causes 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-sealed, plastic-sealed, or surface mount packages, while higher-power varactor diodes mostly use metal-sealed packages. Common varactor diode parameters.

westelettric electrical component classification

Circuit breakers are classified by number of poles: single-pole, two-pole, three-pole, and four-pole; by installation method: plug-in, fixed, and draw-out types.

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