comelit electrical components Germany comelit model comelit price

comelit electrical components refer to the aggregate of service equipment provided to a specific group of traffic sources, such as trunk lines, switching devices, control systems, etc. The fundamental research content of traffic theory is to study the relationship between traffic volume, call loss, and bundle capacity. Therefore, the line bundle is an important basic concept in traffic theory. The traffic source is the service object of the line bundle, usually referring to user equipment; broadly speaking, the upper-level equipment is the traffic source for the lower-level equipment. In telephone communication, the traffic source is also called the call source. The number of service devices contained in the line bundle is called the bundle capacity. Figure 1 is a schematic diagram of the line bundle. The capacity of this line bundle is V, and it provides service to N traffic sources. Any traffic source initiating a call can occupy an idle service device in the line bundle.

comelit electrical components function

The starter solenoid switch is a key component of the starter motor, and the design quality of the solenoid switch directly affects the reliability of the starter motor. The starter solenoid switch has two functions: one is to connect the main circuit to rotate the starter motor, and the other is to push out the drive gear through the shift fork to engage with the engine flywheel ring gear. Therefore, the solenoid switch is required to have corresponding suction force, corresponding stroke, and contacts that can reliably switch high currents. In addition, it is required to minimize volume and weight as much as possible. Based on the above characteristics, the contact structure of the solenoid switch generally adopts a contact form, that is, the moving contact is made into a bridge piece or disc shape to provide a larger heat dissipation surface and heat capacity. The magnetic system mostly adopts a solenoid electromagnet structure to meet the requirements of corresponding stroke, corresponding suction force, small volume, and light weight. The moving iron core of the solenoid switch can move smoothly in the brass bushing equipped with a solenoid coil. The moving iron core pull rod is connected to the shift fork unidirectional coupler. Under the action of the return spring, the moving iron core normally remains in the initial non-working position. When starting, the starter drive gear needs to move forward by approximately 12-28mm. Therefore, when the solenoid switch begins to close, a large magnetomotive force is required to generate the necessary initial suction force. After being pulled in, the air gap decreases, and the electromagnetic suction force increases sharply, greatly exceeding the force required to maintain the closed state. For this reason, the solenoid switch adopts two coils (attraction coil and holding coil). At the beginning, the attraction coil and the holding coil jointly generate electromagnetic suction force. After the switch contacts are closed, the attraction coil automatically disengages from the working state, and the holding coil alone maintains the switch in the closed state. The holding coil current is relatively small, and thinner wires can be used for winding. This not only reduces the volume of the solenoid switch but also achieves reasonable suction force matching. To ensure the reliability of the starter motor, it is necessary to focus on controlling the design quality of the solenoid switch.

comelit electrical components principle

Photoelectric sensors generally consist of 2 parts: processing channels and processing elements. Its 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 irradiates an object, which can be regarded as a series of photons with certain energy bombarding the object. At this time, the photon energy is transferred to electrons, and the entire energy of one photon is absorbed by one electron at once. After the electron receives the energy transmitted by the photon, its state changes, thereby generating corresponding electrical effects in the object exposed to light. The photoelectric effect is usually divided into 11 categories: ① The phenomenon where electrons overflow from the object surface under the action of light is called the external photoelectric effect, such as 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 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 photocells. Photoelectric detection methods have advantages such as high precision, fast response, and non-contact operation, and can measure many parameters. The sensor structure is simple and flexible in form. Therefore, photoelectric sensors are widely used in detection and control. Photoelectric sensors are key components for realizing 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 quantity, such as light intensity, illuminance, radiation temperature measurement, gas composition analysis, etc.; they can also be used to detect other non-electrical quantities that can be converted into changes in light quantity, such as part diameter, surface roughness, strain, displacement, vibration, speed, 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.

comelit electrical components classification

In different application scenarios, the purpose of applying varistors varies, and the voltage/current stress acting on the varistors is not the same, so the requirements for varistors are also different. Paying attention to distinguishing these differences is very important for correct use. According to different purposes, varistors can be divided into two categories: protection varistors and circuit function varistors. ① Protection varistors: 1. Distinguish between power supply protection varistors and signal line/data line protection varistors, as they must meet different technical standard requirements. 2. According to the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into AC type or DC type. The aging characteristics of varistors under these two voltage stresses are different. 11. According to the different abnormal overvoltage characteristics withstanded by the varistor, varistors can be divided into three types: surge suppression type, high power type, and high energy type. ② Surge suppression type: Refers to varistors used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage. The occurrence of this transient overvoltage is random and non-periodic, and the peak current and voltage may be very high. The vast majority of varistors belong to this category. ③ High power type: Refers to varistors used to absorb continuous pulse groups that appear periodically, such as varistors connected in parallel to switching power supply converters. Here, the impact voltage appears periodically, and the period is known. The energy value can generally be calculated. The voltage peak is not large, but due to the high frequency of occurrence, the average power is quite large. ④ High energy type: Refers to varistors used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For these applications, the main technical indicator is energy absorption capacity. The protection function of varistors can be used repeatedly in most application scenarios, but sometimes they are made into one-time protection devices like current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

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