Motor Switch

It presents the coiled rotor, supplied with switch and brushes. There are two types of electric motor commutator: the motor series and the motor of repulsion. In the repulsion motor the brushes are short-circuited. Thus, by the action of electromagnetic induction, the field of the stator forms a current in the winding of the rotor, which, in turn, forms a magnetic field whose poles need the position of the brushes.
The interaction of the fields entails the manifestation of the magnetic force, causing the rotor to rotate. As this engine model features high starting torque and high speeds with light loads, it is used in heavy load starting applications.
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The AC series motors are similar to DC, but have different behavior. For example, if a DC-series motor were to be connected to an AC source, there would be great sparking on the brushes and low current consumption, due to the high impedance of the series winding, without specifying the decrease in power factor output and drop.
The AC series motors feature high efficiency in applications that have low frequency, especially in electric locomotives, elevators cranes.

Motors Installed in Risk Areas

Electric motors prepared to operate in hazardous areas have additional safety features, which have specific standards for each type of risk area, according to their classification.

Before installing, operating or servicing electric motors in hazardous areas, the following precautions must be taken:
– The standards that are applied for engines operating in an area of risk must be studied and understood;
– All requirements required in the standards must be met.
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In addition to all the basic care and compliance with the standards for the installation and operation of these types of electric motors, we must take extra care that is applied in hazardous areas. The care is:
– Desennen the engine and wait until it is completely stopped, in order to carry out the process of maintenance, inspection or repair in the engines;
– All existing protections must be installed and properly adjusted before starting up;
– Ensure that the motors are properly grounded;
– The connection terminals must be properly connected in such a way as to avoid any type of bad contact that could generate heat or spark.