The alternating current arose in 1832, when the Frenchman Hippolyte Pixxii made use of the principle of electromagnetic induction of Michael Faraday. Nikola Tesla and other scholars, years after the invention of alternating current, improved the AC distribution system as well as some innovations that made its application more practical.
In this way, the polyphase system came to dominate, thanks to the advantages of reduced cost, practicality and efficiency in relation to the direct current. The alternating current or alternating current consists of an electric current, in which its direction can vary in time, unlike the direct current, that its sense is constant in the course of all the time. H18005
The usual waveform in an alternating current power circuit is sinusoidal in the form of power transmission being considered more effective. However, in some specific applications, different waveforms are used, for example, triangular or square waves. While the source of direct current is made by the positive and negative poles, the alternating current is composed of phases, and in most cases, by the neutral wire.
The rotor of the electric motor requires a torque to start its rotation, and this torque is produced at first by magnetic forces developed between the magnetic rotor poles and those of the stator (fixed part). The attraction or repulsion forces, formed between stator and rotor, “pull” or “push” the movable rotor poles, causing torques, which cause the rotor to rotate faster and faster, until the frictions or loads attached to the axis decrease the torque resulting from the value ‘zero’. After that moment, the rotor rotates with intermittent angular velocity.
Both the rotor and the stator of the motor need to be ‘magnetic’, because these forces between poles are responsible for producing the torque needed to make the rotor rotate. The rotation of electric motors is the cornerstone of many home appliances.
This rotating movement is often obvious, as in fans or cakes, but often gets a little disguised, such as the washing machine shakers or the window “electric window” motors of certain motor vehicles. To understand the operation of the motor we need some prior knowledge about electromagnetism, such as magnets, magnetic forces between magnets, and the action of magnetic fields on currents.
The joining of insulation materials, which are usually used in an electrical equipment is called an insulation system. This joint in an electric motor unites numerous factors, such as groove closure insulation, insulation between phases, wire insulation enamel, groove bottom, varnish or impregnation resin, insulation of the connecting cable and welding.
Materials that have as main function to isolate are essentially responsible for limiting, directing and even preventing the flow of electric currents. Although it is one of the main functions of the insulation material, it acts to impede the current flow of a conductor to earth or even a lower potential, it can still offer a specific mechanical support, thus preserving the driver from any deterioration that may come to be triggered by external factors and pass external heat into the environment. 5600 OLS
Solid liquid components or gases can be used in the insulation of electrical equipment, varying according to the needs of the system. Insulation systems are able to intervene in the quality of equipment, as well as insulation, directly influencing the weight, cost, performance and durability of your system.