AC drive motor construction

AC drive motor control is organized in the following way: personal computer interface, the engine, the process path and the electrical supply. The electrical supply conducts electricity to the drive, one criterion for selection for the drive is the supply electrical voltage and its frequency.
The variable frequency drive transfers the converted frequency and voltage to the engine. The process of conversion is controlled by means of the user and process interfaces. The user interface displays the work of the AC drive and various process information. This function helps the drive to integrate with other blocking  process control systems and process control equipment.

The engine’s  bearable load curves with a variable frequency drive

The bearable load curves cannot be modified, if there is no frequency converter in the motor. It will produce a driving moment at some speed and max driving moment cannot be surpassed. According to  frequency converter drive, there exist various loading options. Curve 1 in the picture, which is named the standard curve,  can be used for a protracted period of time. Other curves can be used for some time only, as the engine’s cooling system is not account for heavy use. The higher bearable load might be needed, for instance, during the ignition of the engine. In some cases, the greater amount of  driving moment is required when starting up. So engine can be dimensioned in accordance with to its standard use with the help of frequency converter. This minimizes capital commitment. The load, the engine and  the variable frequency drive must easily  integrate in order to be able to use  the abovementioned functions. Alternatively the converter or the engine will overheat and as a result will fail to function.

AC drive features for more efficient process control

AC drives also have other characteristics and features which are generally required for more efficient  process control. With input and output parameters  various types of process information can be conducted to the drive and it therefore will control the engine accordingly.  Otherwise, the load will fail to prevent  errors and to protect the whole  drive system.

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