Yamaichi electrical components German Yamaichi model Yamaichi price

Yamaichi electrical components are a common type of low-current master control device. They utilize the collision of moving parts of production machinery to actuate their contacts, thereby making or breaking control circuits to achieve specific control objectives. Typically, such switches are used to limit the position or travel of mechanical motion, causing the moving machinery to automatically stop, reverse, change speed, or perform automatic reciprocating motion at a specified position or travel. In electrical control systems, the role of position switches is to implement sequence control, positioning control, and detection of position status. They are used to control the travel of mechanical equipment and provide limit protection. Construction: Composed of an operating head, contact system, and housing. In actual production, limit switches are installed at predetermined positions. When a module mounted on the moving part of the production machinery strikes the limit switch, the contacts of the limit switch actuate, achieving circuit switching. Therefore, a limit switch is an electrical device that switches circuits based on the travel position of moving parts; its operating principle is similar to that of a pushbutton. Limit switches are widely used in various machine tools and lifting machinery to control their travel and provide terminal limit protection. In elevator control circuits, limit switches are also used to control the speed of opening and closing car doors, provide automatic door opening/closing limits, and provide upper and lower limit protection for the car.

Yamaichi electrical component principles

Photoelectric sensors generally consist of 2 parts: processing channels and processing elements. Their basic principle is based on the photoelectric effect, converting changes in the measured quantity into changes in optical signals, and then using photoelectric elements to further convert non-electrical signals into electrical signals. The photoelectric effect refers to the phenomenon where light irradiating an object can be viewed as a stream of photons with certain energy bombarding the object. At this time, photon energy is transferred to electrons, and the entire energy of one photon is absorbed by one electron at once. After gaining the energy transferred by the photon, the state of the electron changes, causing the corresponding electrical effect in the object exposed to light. The photoelectric effect is usually divided into 8 categories: (1) The phenomenon where electrons escape from the surface of an object under the action of light is called the external photoelectric effect, such as in phototubes and photomultiplier tubes; (2) The phenomenon where the resistivity of an object changes under the action of light is called the internal photoelectric effect, such as in photoresistors and phototransistors; (3) The phenomenon where an object generates an electromotive force in a certain direction under the action of light is called the photovoltaic effect, such as in photocells. Photoelectric detection methods have advantages such as high precision, fast response, and non-contact operation. Moreover, they can measure many parameters, and the sensor structure is simple and flexible. Therefore, photoelectric sensors are widely used in detection and control. Photoelectric sensors are key components for achieving photoelectric conversion in various photoelectric detection systems; they are devices that convert optical signals (visible and ultraviolet laser light) into electrical signals. Photoelectric sensors use photoelectric devices as conversion elements. They can be used to detect non-electrical physical quantities that directly cause changes in light intensity, such as light intensity, illuminance, radiation temperature measurement, and gas composition analysis. They can also be used to detect other non-electrical quantities that can be converted into changes in light intensity, such as part diameter, surface roughness, strain, displacement, vibration, velocity, acceleration, as well as object shape and working status recognition. Photoelectric sensors have characteristics such as non-contact operation, fast response, and reliable performance, so they are widely used in industrial automation devices and robots. The continuous emergence of new photoelectric devices, especially the birth of CCD image sensors, has opened a new chapter for the further application of photoelectric sensors.

Yamaichi electrical component classification

Thermosensitive materials are generally divided into three categories: semiconductor, metal, and alloy: 1. Semiconductor thermistor materials include single-crystal semiconductors, polycrystalline semiconductors, glass semiconductors, organic semiconductors, and metal oxides. They all have very large resistance temperature coefficients and high resistivity, resulting in high sensitivity for sensors made from them. Based on the resistance temperature coefficient, they can also be divided into negative temperature coefficient (NTC) materials and positive temperature coefficient (PTC) materials. For example, barium titanate ceramic is an ideal PTC semiconductor material. Both types of materials are widely used in temperature measurement, temperature control, temperature compensation, switching circuits, overload protection, and time delay applications, such as in the manufacture of thermistor thermometers, thermistor switches, and thermistor delay relays. Due to the exponential relationship between resistance and temperature, these materials have a narrow temperature measurement range and poor uniformity. 2. Metal thermistor materials are widely used as thermal resistors for temperature measurement, current limiters, and automatic constant-temperature heating elements. Examples include platinum resistance thermometers, nickel resistance thermometers, and copper resistance thermometers. Among them, platinum temperature sensors exhibit significantly high precision and stability in various media (including corrosive media). However, their widespread application is somewhat limited due to the scarcity and high price of platinum. Copper temperature sensors are cheaper, but long-term use in corrosive media can lead to significant changes in static characteristics and resistance values. Nickel temperature sensors are widely used abroad and are considered an ideal material because they offer high sensitivity, satisfactory reproducibility, and stability. 3. Alloy thermistor materials, also known as thermistor alloys. This type of alloy has relatively high resistivity, and its resistance value is sensitive to temperature changes, making it a good material for manufacturing temperature-sensitive sensors. The performance requirements for thermistor alloys as temperature-sensitive sensors are as follows: (1) Sufficiently high resistivity; (2) Relatively high resistance temperature coefficient; (3) Linear expansion coefficient close to that of the experimental material; (4) Low strain sensitivity coefficient; (14) Good repeatability of the resistance-temperature curve during heating and cooling within the operating temperature range.

Yamaichi electrical component characteristics

Common types include RC phase-shifting bridge trigger circuits, unijunction transistor trigger circuits, bipolar junction transistor trigger circuits, and trigger circuits that use small thyristors to trigger large thyristors, among others. The main parameters of thyristors are: 1, Rated on-state average current IT: The average value of the 50 Hz sinusoidal half-wave current that can continuously pass between the anode and cathode under specified conditions. 2, Forward blocking peak voltage VPF: The forward peak voltage that can be repeatedly applied across the thyristor when the gate is open without a trigger signal and the anode forward voltage has not exceeded the turn-on voltage. The forward peak voltage withstand by the thyristor must not exceed this parameter value given in the manual. 3, Reverse blocking peak voltage VPR: The reverse peak voltage that can be repeatedly applied across the thyristor when it is under reverse voltage and in the reverse blocking state. During use, this parameter value given in the manual must not be exceeded. 4, Trigger voltage VGT: The minimum gate current and voltage required to switch the thyristor from the off state to the on state when a certain voltage is applied between the anode and cathode at a specified ambient temperature. 8, Holding current IH: The minimum anode forward current required to maintain the thyristor in the conducting state at a specified temperature with the gate circuit open. Many new types of thyristor components have been introduced, such as fast thyristors suitable for high-frequency applications, bidirectional thyristors that can be controlled to conduct in both directions using positive or negative trigger signals, and thyristors that can be turned on by a positive trigger signal and turned off by a negative trigger signal.

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