Optimal Regulation of Electric Drives With Constant Load Torque

2006 ◽  
Vol 53 (6) ◽  
pp. 1762-1769 ◽  
Author(s):  
Carlos Mario Vega Gonzalez ◽  
Jaime Rodriguez Arribas ◽  
Dionisio Ramirez Prieto
Keyword(s):  
Constant Load ◽  
Load Torque ◽  
Optimal Regulation ◽  
Electric Drives

scholarly journals Dynamic Torque Limitation Principle in the Main Line of a Mill Stand: Explanation and Rationale for Use

Machines ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 76 ◽  
Author(s):  
V.R. Gasiyarov ◽  
V.R. Khramshin ◽  
S.S. Voronin ◽  
T.A. Lisovskaya ◽  
O.A. Gasiyarova
Keyword(s):  
Research Team ◽  
Elastic Collision ◽  
Dynamic Loads ◽  
Load Torque ◽  
Electric Drives ◽  
Drive Control ◽  
Negative Acceleration ◽  
Before And After ◽  
Mill Stand ◽  
Case Basis

This paper substantiates why it is necessary to limit the dynamic loads in stand shafts when closing angular gaps. The paper is a feasibility study of a concept developed specifically to limit each of the factors that affect amplitude of the dynamic torque; limitations applied are determined on a case-by-case basis. The research team studied the components of elastic torque in a dual-mass electromechanical system of Mill 5000 caused by vibrations arising from the elasticity of transmission as well as from the vibrations caused by elastic collision itself. It is shown that the lowest possible pre-acceleration is necessary for decreasing the dynamic coefficient at a near-nominal load torque. A principle of limiting dynamic loads when closing an angular gap is proposed, which implies collecting tachograms of an electric drive subjected to positive or negative acceleration before and after the fed metal is captured. The research team has developed drive control principles to implement this approach. The recommendation is to upgrade the electric drives of the reversing stand in Mill 5000.

The Influence of Forces in the Cutting Zone on the Feed Drive Movement of a Milling Machine

2020 ◽  
pp. 13-25
Author(s):  
A.I. Ermolaev ◽  
V.I. Erofeev ◽  
A.S. Plekhov
Keyword(s):  
Degrees Of Freedom ◽  
Milling Process ◽  
Milling Machine ◽  
Review Of Literature ◽  
Load Torque ◽  
Electric Drives ◽  
Average Value ◽  
Milling Parameters ◽  
Feed Drive ◽  
Cutting Zone

An analysis of the influence of mechanical processes of metal milling on the accuracy of machining by a working body (a table with a workpiece) when the feed is controlled by a software program through a series of electric drives is an important problem. A review of literature revealed a lack of works on the estimation of force pulsations in the cutting zone during milling and their effect on the feed drive movement. To solve this problem, the authors of the article developed a mathematical model of the milling process that took into account two degrees of freedom, using which a simulation model was obtained to study pulsations of the force in the cutting zone in magnitude and direction. The study showed that during milling, especially with cylindrical and face mills, the amplitude of force pulsations in the cutting zone can reach 50% relative to the average value. The study of the influence of the milling parameters on the relative movement of the working body and the cutter made it possible to establish a relationship between the rotational speed of the cutter, feed per tooth and positioning error, as well as the error due to the characteristics of the feed drive. Expressions of the load torque fluctuations of the output shafts of the electric drives and the fluctuations of their rotation speeds caused by force pulsations were obtained.

A Method for the Estimation of the Constant Load Torque by Using the Steady-State Electrical Torque Signal

2021 ◽  
Author(s):  
Renato Ortega ◽  
Mariela Cerrada ◽  
Diego Cabrera ◽  
Rene-Vinicio Sanchez
Keyword(s):  
Steady State ◽  
Constant Load ◽  
Load Torque
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