boehmer electrical components Germany boehmer model boehmer price

boehmer 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 according to a predetermined position or travel. In electrical control systems, the role of limit 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 pre-arranged positions. When a module mounted on the moving parts 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.

boehmer electrical component characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If there is a linear relationship between the sensor's output and input, then the sensitivity S is a constant. Otherwise, it will vary with changes in the input. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity can yield higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and often the poorer the stability.

boehmer electrical component characteristics

Under normal circumstances, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical work, to enable instruments to have uniformly scaled readings, a fitted straight line is commonly used to approximately represent the actual characteristic curve. Linearity (non-linear error) is a performance indicator of this degree of approximation. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero-input and full-scale output points can be used as the fitted straight line; or the theoretical straight line that minimizes the sum of squared deviations from each point on the characteristic curve can be used as the fitted straight line, which is called the least squares fitted straight line.

boehmer electrical component classification

Plug-in fuses are often used at the end of lines for short-circuit protection of distribution branch circuits or electrical equipment. Spiral fuses have a fuse indicator on the upper cap of the fusible element. Once the fusible element melts, the indicator pops out immediately and can be observed through the glass hole on the ceramic cap. They are often used in machine tool electrical control equipment. Spiral fuses. Enclosed fuses are divided into filled fuses and non-filled fuses. Filled fuses generally use square ceramic tubes containing quartz sand and the fusible element, offering high breaking capacity. Non-filled enclosed fuses enclose the fusible element in a sealed cylinder, having slightly lower breaking capacity. Fast-acting fuses are mainly used for short-circuit protection of semiconductor rectifier elements or rectifier devices. Since semiconductor components have very low overload capacity and can only withstand large overload currents for extremely short periods, short-circuit protection requires fast-acting fusing capability. The structure of fast-acting fuses is basically the same as that of filled enclosed fuses, but the material and shape of the fusible element differ. It uses a variable cross-section fusible element stamped from silver sheets with V shaped deep grooves. Fast-acting fuses are commonly referred to as "fast fuses," characterized by fast fusing speed, high rated current, strong breaking capacity, stable current-limiting characteristics, and small size. Self-resetting fuses use sodium metal as the fusible element, which has high electrical conductivity at room temperature. When a short-circuit fault occurs in the circuit, the short-circuit current generates high temperatures that rapidly vaporize the sodium. The gaseous sodium presents a high-resistance state, thereby limiting the short-circuit current. After the short-circuit current disappears and the temperature drops, the sodium metal restores its original good conductive performance. Self-resetting fuses can only limit short-circuit current and cannot truly break the circuit. Their advantage is that the fusible element does not need to be replaced, allowing for repeated use.

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