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abb schweiz electrical components refer to electronic components that generate resonant frequencies, commonly divided into quartz crystal resonators and ceramic resonators. They function to generate frequencies and feature stability and good anti-interference performance, making them widely used in various electronic products. The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but their cost is also higher. Resonators primarily serve a frequency control function; all electronic products involving frequency transmission and reception require resonators. Based on their physical form, resonators can be classified into two types: through-hole and surface-mount.

abb schweiz electrical component classification

Thyristors have multiple classification methods: (1) Classification by turn-off, conduction, and control methods: Thyristors can be divided into conventional thyristors, bidirectional thyristors, reverse-conducting thyristors, gate turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors, among others. (2) Classification by pins and polarity: Thyristors can be divided into two-pin thyristors, three-pin thyristors, and four-pin thyristors based on their pins and polarity. (3) Classification by package type: Thyristors can be divided into three types based on their package: metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors. Among these, metal-packaged thyristors are further divided into bolt-type, flat-type, and round-case types, among others; plastic-packaged thyristors are divided into two types: with heat sink and without heat sink. (4) Classification by current capacity: Thyristors can be divided into three types based on current capacity: high-power thyristors, medium-power thyristors, and low-power thyristors. Typically, high-power thyristors mostly use metal casing packages, while medium- and low-power thyristors mostly use plastic or ceramic packages. (5) Classification by turn-off speed: Thyristors can be divided into conventional thyristors and high-frequency (fast) thyristors based on their turn-off speed. (6) Zero-crossing triggering - generally for power regulation, i.e., triggering occurs when the phase of the sinusoidal AC voltage crosses zero; the thyristor conducts only upon zero-crossing. (7) Non-zero-crossing triggering - the thyristor can be triggered to conduct regardless of the AC voltage phase; common examples include phase-shift triggering, which changes the output percentage by altering the conduction angle (phase angle) of the sinusoidal AC.

abb schweiz electrical component functions

When the distance between an observer or system and a wave source changes, the frequency of the approaching waves shifts; this phenomenon is called the Doppler effect. Sonar and radar are developed based on the principle of this effect. The Doppler effect can be utilized to manufacture ultrasonic proximity switches, microwave proximity switches, etc. When an object approaches, the reflected signal received by the proximity switch undergoes a Doppler frequency shift, thereby allowing identification of whether an object is approaching. Proximity switches are widely used in aviation, aerospace technology, and industrial production. In daily life, they are applied in automatic doors at hotels, restaurants, and garages, as well as in automatic hot air blowers. For security and anti-theft purposes, important locations such as archives, accounting departments, financial institutions, museums, and vaults are typically equipped with anti-theft devices composed of various proximity switches. In measurement technology, such as for length and position measurements; and in control technology, such as for the measurement and control of displacement, speed, and acceleration, a large number of proximity switches are also used.

abb schweiz electrical component composition

1. Wiring harnesses are designed to facilitate installation and maintenance, ensuring that electrical equipment can operate under the harshest conditions. Wires of different specifications and colors used by various electrical equipment in the entire vehicle are reasonably arranged and combined into a single unit, with the wires bundled together using insulating materials, making the assembly both complete and reliable. 2. Proper selection of wire cross-sectional area and color codes: (1) Correct selection of wire cross-sectional area: Electrical equipment in vehicles selects the wire cross-sectional area based on the magnitude of the load current. For electrical equipment operating for long durations, wires with an actual current carrying capacity of 60% may be selected; for electrical equipment operating for short durations, wires with an actual current carrying capacity of 60% to 106% may be used. (2) Selection of wire color codes: To facilitate identification and maintenance, wires in wiring harnesses use different colors. For ease of annotation in circuit diagrams, wire colors are represented by letters, with the corresponding colors noted in each circuit diagram.

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