An electric coil is a kind of inductive resistance for alternating current. If you introduce an element such as a steel core into the coil, you can significantly increase the inductance index. By themselves, electrical appliances do not connect, but if you still close them and connect the galvanometer, then its arrow will move.
Spiral Coil Flat Type
There is such a type of electric coil as a flat spiral. It is presented in the form of a primary winding of a transformer. The coil is usually placed on a disk of lead or zinc, which has a high electrical conductivity. Although you can use other material that will have the same quality. It is important that the material is able to maintain this quality at elevated temperatures. Such a disk is most often a secondary winding of the same transformer. If the temperature is within normal limits, then the conductivity value will be kept within normal limits for the particular raw material that is used.
Coil processing. Instrument Operation
Few people know that electric coils need to be impregnated. It is impregnated with different varnishes, and it is necessary in order to improve resistance to moisture, increase thermal conductivity. It is also possible to improve electrical and mechanical strength. There are classes of electric coils such as A, B or E. Classification is carried out by resistance to heat. Glossy and waterproof coatings must withstand temperatures up to 250 degrees Celsius.
When electric current is supplied to this device, the bracket is retracted along with the core. The bracket moves to a position where it begins to press on the stem, which moves with the rubber membrane. The movement of the rod entails a decrease in the internal volume of the sealed cavity to its minimum value. An increase in this plane is also possible. This can happen due to the action of the spring, as well as the own mass of the rod, which will begin to return to its original position when the current supply stops and the bracket returns to its original state.
Fluxgate
A flux gate is an electric coil with a core, which is presented in the form of a soft magnetic ferromagnet. It is powered by alternating current. This part is very sensitive to such parameters as the magnitude and direction of the magnetic field.
At the moment, coils in an electric circuit are used in engineering, instruments and devices, which may have a core, or can do without it. It is worth noting that to isolate the turns of such electrical equipment, paper is used that is pre-impregnated with varnish. The greatest distribution of such devices with electric current in the coil received in the field of electrical engineering. Most often they are built into measuring devices. In them, the coil is presented in the form of a winding, which is located on the frame of a certain shape. The base itself also has flanges, as well as a cover.
Types of Coils
To date, there are many different types of such devices.
For example, a device with a winding on the frame, flanges with protrusions. These protrusions have small chambers, which are made in the form of the letter T. In such grooves are the petals used to solder the ends, they are in the shape of the letter G. Among the shortcomings of such a coil, the complexity of its design and the complexity in the technological process stand out. In addition, for the stable operation of the electric field of the coil, it is necessary to solder the leads to the petals. This procedure is performed during winding. The downside was that due to this, the performance of all connected winding equipment is reduced.
Another well-known type of device is a frame with flanges on which protrusions are located, as well as contact holders. The protrusions in this case are performed with a recess. The holder for contact with the U-shaped groove is located in such recesses. For this type of device, the minus was that during the winding of the coil at high speed, there is a great chance of falling out of both the contacts and their holders.
Coil with terminal
An electric coil is used, the winding of which is located on a frame with flanges. On one of them is a terminal holder, as well as output contacts. The main difference from other devices of this type is that the holder is made in the form of a partition. There are two lateral protrusions that are located symmetrically, as well as a central one. It is mounted taking into account a small gap, which is set in relation to the side protrusions in such a way that as a result a U-shaped channel is obtained. Contacts will be placed in this channel in the future. It is also worth noting that each side protrusion has a through hole.