evn lichttechnik electrical components Germany evn lichttechnik model evn lichttechnik price

evn lichttechnik electrical components are electronic devices made from semiconductor materials (silicon, selenium, germanium, etc.). A diode has two electrodes: the positive electrode, also called the anode; and the negative electrode, also called the cathode. When a forward voltage is applied across the two poles of the diode, the diode conducts; when a reverse voltage is applied, the diode cuts off. The conduction and cutoff of the diode are equivalent to the closing and opening of a switch. The diode has unidirectional conductivity, and when conducting, the current flows from the anode through the tube to the cathode. The diode is one of the earliest semiconductor devices, and its applications are very extensive. Especially in various electronic circuits, by reasonably connecting diodes with resistors, capacitors, inductors and other components to form circuits with different functions, it is possible to achieve functions such as rectification of AC power, demodulation of modulated signals, limiting and clamping, and voltage stabilization of power supply voltage.

evn lichttechnik electrical component classification

Based on the power supply used for operation, motors can be classified into DC motors and AC motors. Among them, AC motors are further divided into single-phase motors and three-phase motors. According to their structure and working principles, motors can be categorized into DC motors, asynchronous motors, and synchronous motors. Synchronous motors can also be subdivided 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 classified into three-phase asynchronous motors, split-phase asynchronous motors, and shaded-pole asynchronous motors. AC commutator motors include single-phase series-wound motors, universal motors (AC/DC), and repulsion motors. Based on starting and operating methods, motors can be classified as capacitor-start single-phase asynchronous motors, capacitor-run single-phase asynchronous motors, capacitor start-and-run single-phase asynchronous motors, and split-phase single-phase asynchronous motors. Motors can also be categorized by application into drive motors and control motors. Drive motors are further divided into motors for electric tools, household appliances, and other general small mechanical equipment. Control motors include stepper motors and servo motors, among others. Based on rotor structure, motors can be classified as squirrel-cage induction motors and wound-rotor induction motors. Finally, based on operating speed, motors can be categorized as high-speed motors, low-speed motors, constant-speed motors, and variable-speed motors.

evn lichttechnik electrical component parameters

1. Nominal varistor voltage: refers to the voltage value across the varistor when a pulse current of specified duration passes through. 2. Voltage ratio: refers to the ratio of the voltage value generated by the current of the varistor to the voltage value generated by the current of the varistor. 3. Maximum limiting voltage: the peak voltage across the varistor under the maximum pulse peak current Ip that the varistor can withstand and under the specified waveform. 4. Residual voltage ratio: when the current passing through the varistor is a certain value, the voltage generated across it is called the residual voltage of this current value. The residual voltage ratio is the ratio of the residual voltage to the nominal voltage. 5. Current handling capacity: Current handling capacity, also known as current flow, refers to the maximum pulse current value allowed to pass through the varistor under specified conditions. 6. Leakage current: Leakage current, also known as standby current, refers to the current flowing through the varistor at the specified temperature and maximum DC voltage. 7. Voltage temperature coefficient: refers to the rate of change of the nominal voltage of the varistor within the specified temperature range, that is, the relative change in the voltage across the varistor when the temperature changes while the current passing through the varistor remains constant. 8. Current temperature coefficient: refers to the relative change in the current flowing through the varistor when the temperature changes while the voltage across the varistor remains constant. 9. Voltage nonlinearity coefficient: refers to the ratio of the static resistance value to the dynamic resistance value of the varistor under a given applied voltage. 10. Insulation resistance: refers to the resistance value between the lead wires of the varistor and the insulating surface of the resistor body. 11. Static capacitance: refers to the inherent capacitance of the varistor itself. 12. Rated power: the maximum power that causes the varistor voltage to change when operating at a specific ambient temperature. 23. Maximum surge current: the maximum surge current that causes the varistor voltage to change when the varistor is impacted by a specific pulse current once or twice.

evn lichttechnik electrical component principle

Photoelectric sensors achieve control by converting changes in light intensity into changes in electrical signals. Generally, photoelectric sensors consist of three parts: transmitter, receiver and detection circuit. The transmitter emits a light beam towards the target. The emitted light beam generally comes from semiconductor light sources, such as light-emitting diodes (LED), laser diodes and infrared emitting diodes. The light beam is emitted continuously, or the pulse width is changed. The receiver consists of photodiodes, phototransistors and photocells. Optical components such as lenses and apertures are installed in front of the receiver. Behind it is the detection circuit, which can filter out effective signals and apply these signals.

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