SELECTING THE TYPE OF ELECTRIC DRIVE FOR A MECHANISM WITH SYSTEMATIC UNDERLOADING
DOI:
https://doi.org/10.32718/agroengineering2025.29.117-121Keywords:
electric drive, grinder, frequency converter, model, graphical dependenceAbstract
The paper discusses the design and operation of a feed grinder and the control scheme of an automated electric drive system. In modern operational conditions, many enterprises face power outages and utilize backup power sources with limited capacity. Given the livestock industry's constant need for feed availability, it sometimes becomes necessary to perform grinding operations while relying on these backup power sources. To facilitate the operation of the backup power source, it is possible to reduce the load on the grinder. The paper also analyzes other types of grinders, along with their structures and control schemes for automated electric drive systems. A proposal is made to upgrade the electric drive by replacing the on-off control of the asynchronous motor with smooth load control, achieved through frequency control of the motor's rotation speed. Additionally, to ensure the grinder operates effectively with a backup power source, it is recommended to connect the main motor to a reduced voltage by configuring the windings in a "star" circuit.
The work describes a developed model of the proposed automated electric drive system for a grinder, which includes an automated feeding mechanism based on a frequency converter. Research was conducted to evaluate its performance in both nominal operating mode and when supplied with reduced voltage according to the "star" configuration and a lower task signal. The graphical representations of transient processes during load changes demonstrated a high response speed of the automated electric drive system, which enables efficient performance.
The technological benefits of increased grinder productivity in nominal mode are attributed to this rapid response, allowing the electric drive to handle its nominal load effectively, as the automatic control system can quickly manage overload situations. Furthermore, the system ensures the grinder operates smoothly despite contemporary power supply challenges, particularly when running off a limited power source.
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