E-T-A electrical components German E-T-A models E-T-A prices

E-T-A electrical components are devices that convert electrical energy into mechanical energy. They utilize energized coils (i.e., stator windings) to generate a rotating magnetic field, which acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors based on the power supply used. Most motors in power systems are AC motors, which can be synchronous or asynchronous (the stator magnetic field speed and rotor rotation speed do not remain synchronized). A motor mainly consists of a stator and a rotor. The direction of motion of current-carrying conductors under force in a magnetic field is related to the direction of the current and the magnetic field lines (magnetic field direction). The working principle of a motor is that the magnetic field exerts force on the current, causing the motor to rotate.

E-T-A electrical component classification

Inductor coils commonly used in circuits are roughly classified as follows: By inductance form: fixed inductors, variable inductors. By magnetic core material: air-core coils, ferrite coils, iron-core coils, copper-core coils. By function: antenna coils, oscillator coils, choke coils, trap coils, deflection coils. By winding structure: single-layer coils, multi-layer coils, honeycomb coils, close-wound coils, spaced-wound coils, self-supporting coils, honeycomb coils, random-wound coils.

E-T-A electrical component parameters

(1) Rated operating voltage: refers to the voltage required by the coil for normal relay operation. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: refers to the DC resistance of the relay coil, which can be measured with a multimeter. (3) Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal use, the supplied current must be slightly greater than the pull-in current to ensure stable relay operation. The operating voltage applied to the coil should generally not exceed the rated operating voltage; otherwise, excessive current may burn out the coil. (4) Release current: refers to the maximum current at which the relay performs the release action. When the current in the pulled-in state decreases to a certain level, the relay returns to the de-energized released state. This current is much lower than the pull-in current. (5) Contact switching voltage and current: refer to the voltage and current loads allowed for the relay. These values determine the magnitude of voltage and current the relay can control. Do not exceed these values during use, as doing so can easily damage the relay contacts.

E-T-A electrical component applications

Metal waveguides and metal resonant cavities are widely used in decimeter, centimeter, and longer millimeter wave bands. Since the cross-section of waveguides and the dimensions of resonant cavities are comparable to the wavelength, metal waveguides and resonant cavities are too small and difficult to manufacture. It is even more impossible to apply metal waveguides or resonant cavities in the infrared or visible light bands, where wavelengths are on the micrometer scale. For this reason, dielectric waveguides and dielectric resonators have developed rapidly and gained widespread application. Although the dimensions of dielectric waveguides and dielectric resonators are also on the scale comparable to the wavelength, they can be easily fabricated into tiny sizes using microfabrication techniques. For example, optical fibers and optical waveguides with cross-sectional dimensions on the micrometer scale belong to dielectric waveguides. The fields in metal waveguides can be viewed as resulting from plane waves reflecting back and forth between conductor surfaces; similarly, the fields in dielectric waveguides can be viewed as resulting from total reflection of electromagnetic waves at dielectric interfaces. Therefore, a dense medium surrounded by a sparse medium forms a dielectric waveguide. In an ideal metal waveguide, the electromagnetic field forms a standing wave transversely, and outside the waveguide boundary, it approximates an ideal conductor with no electromagnetic field. In a dielectric waveguide, the electromagnetic field forms a standing wave transversely, but electromagnetic fields still exist outside the dielectric waveguide, decaying exponentially in the transverse direction, known as evanescent fields. In metal waveguides filled with a homogeneous medium, TE modes and TM modes can independently satisfy the short-circuit boundary conditions of the waveguide walls. Therefore, TE modes and TM modes can always be separated, and both can propagate in metal waveguides. When a metal waveguide is filled with two or more media, or partially filled with dielectric, the electromagnetic field must satisfy not only the boundary conditions on the conductor walls but also the continuity conditions at the media interfaces. In the case of uniform filling with two or more media, only hybrid TE and TM modes, i.e., HEM modes, can exist. With the above understanding, we can further explore dielectric resonators. As early as 1939, the concept and theory of dielectric resonators were proposed, but due to the lack of suitable dielectric materials, this theory remained dormant for over 20 years without practical development. It was not until the 20th century, in the 60s, that the successful development of high-permittivity ceramics such as rutile ceramic (ε≈80100) brought dielectric resonators back into attention. However, the high temperature coefficient of rutile ceramic limited its practical application. In the 20th century, during the 70s, barium titanate and zirconium titanate ceramics were developed. Their high permittivity, low loss, and low temperature coefficient made dielectric resonators practical. Dielectric resonators offer advantages such as small size, light weight, high quality factor, and good stability. They are particularly suitable for application in microstrip circuits, microwave integrated circuits, and millimeter-wave bands, receiving significant attention and rapid development. When the permittivity is very high, the interface between the dielectric and air approximates an open circuit, and the reflection coefficient of electromagnetic waves at the interface approaches 7. At this point, the surface of the dielectric resonator can be regarded as an open-circuit wall, i.e., a magnetic wall. Thus, the dielectric resonator becomes a closed system with homogeneous boundary conditions, equivalent to an open-circuit wall (magnetic wall) resonant cavity.

Weidou Intelligent Technology specializes in selling German E-T-A connectors, E-T-A switches, E-T-A relays, E-T-A controllers, E-T-A plugs, E-T-A sensors, E-T-A resistors, E-T-A capacitors, E-T-A buses, E-T-A modules, E-T-A cables, E-T-A power supplies, E-T-A interfaces, E-T-A gateways, E-T-A circuit breakers. E-T-A products are original imports from Germany. Customers are welcome to inquire and order.