Month: July 2017

Performance Characteristics of an Electric Motor

Balancing is the process that seeks to improve the mass distribution of a body so that it rotates in its bearings without unbalancing forces.

All electric motors are manufactured with anti-friction bearings. Some motors have bearings with permanent lubrication. Other, relubrication devices. There are also those that have grease regulator that automatically prevents over-lubrication.

The first lubrication is sufficient for 1 to 2 years of operation, depending on engine type and speed, considering a continuous operation of approximately 8 hours / day. In general, normal bearings are also used for vertical constructive forms, ie, high speeds and heavy couplings are not used.

The vibration of an electric motor CBL061SF-A is closely related to its assembly and therefore it is generally desirable to perform vibration measurements under the actual installation and operating conditions.

When the manufacturer designs an engine it communicates to the customer, on the nameplate of the engine, this information: characteristics of the mains power supply to the motor and the load to be driven and conditions in which the engine will run. All these values ​​constitute the “Nominal Characteristics” of the engine.

Phenomenon of Electricity

If a coil is placed between two fixed magnets without touching them, the coil will point its north pole to the south pole of the magnet and vice versa. However, since the coil poles are determined by the direction of the current passing through the wire, when it is inverted, the poles are also reversed, which causes the coil to move again.

If this current reversal is constant, it will not stop spinning. When Faraday carried out his experiments, since the only source of electric power available was that of the direct current stack, the change of direction of the current happened by means of a system called a switch, used until now in small motors. This is considered the principle of electric motor operation.

Thus, for the motion to be performed, there must be an interaction between the magnetic fields of a stator, a fixed part of the system, and a rotor, which is the moving part. After Faraday, several other scientists came to speculate about the phenomenon of electricity. Belgian engineer-inventor and inventor Zénobe Théophile Gramme designed an electric motor that behaved like a generator. When connected to an electric current, it produced motor energy. And if moved by a motor force, it produced electrical energy.

Degradation of Thermal Insulators

The life of an insulator can be disastrously reduced if there is a significant overheating of the motor. The main causes of insulation degradation that should be highlighted are line overvoltage, current overhead, dust accumulation that may form conductive bridges, contact with acid vapors or gases displaced by ventilation.

Some important measures for the prevention of the degradation of these insulators are recommended, such as equipping the power boards with preservation devices and appropriate controls, frequently checking their operation. It is also recommended to take advantage of the stopping periods of the motors to clean the coils of the windings. If necessary, you can invest in the installation of filters in the ventilation systems of the motors acme PL112600, providing proper maintenance.

It is also necessary to ensure that the motors are not kept in salubrious places and always carry out the verification of any smoke release, as well as the insulation conditions. The motors must be equipped with alarm and short-circuit protection devices. Periodic observation of untimely noise and vibrations and possible overheating signals is necessary, always recording temperatures during operation.