The electric motors are commanded by means of starters and the most applied are the direct, reversing starter, which works in the drive of small motors; Star triangle starter, which acts on the drive of large motors that have no load; compensating start-up that drives the big engines with load; and starting with frequency inverter, which acts in the drive of FD84000 OLP small and large motors.
Starters include protection devices such as fuse, thermal relay, circuit breaker, control devices such as buttons, contactors and timers. And there are also signaling devices, such as signal, voltmeter and ammeter.
All of these starting switches have a main circuit and a control circuit, where the main or power circuit, as it is also called, acts on the motor supply, in this way it ends up having the function of connecting the terminals and wires of the motor the power grid. In turn, the control circuit, as its name says, has the function of controlling the power circuit, thus determining when the motor can be turned on or off.
The magnetic cores of electric motors, which are stators and rotors, with rare exceptions, are constructed from thin metal sheets (low carbon steel plates) with a thickness of less than 1 mm, grouped in sheet metal packages. Magnetic nuclei surrounded by coils (windings), where alternating currents circulate, cause a magnetic flux also alternating and for that reason, these nuclei are subject to the action of parasitic currents. These currents are known as Foucault currents, which are responsible for appreciable loss of power in these nuclei.
Some higher performance motors are designed with silicon steel plates, with a percentage of approximately 3% silicon. The total process for making these cores consists essentially of lamination, stamping, a treatment for electrical insulation, packaging and fixing. With regard to low carbon steel plates, the process for insulation is based on a heat treatment, where the packages of plates are placed in kilns for a certain time, there being oxidation of the surface of the plates, and as a consequence, the formation of an insulating layer of iron oxide between the adjacent sheets. Some types of silicon steel sheets are provided by manufacturers with a paint based oxide on one of the surfaces.
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