Energy Efficiency and Performance Optimized Control of a Hybrid Feed Drive

2015 ◽  
Author(s):  
Molong Duan ◽  
Chinedum E. Okwudire
Keyword(s):  
Energy Efficiency ◽  
Machine Tools ◽  
High Speed ◽  
Control Strategies ◽  
Electrical Energy ◽  
Motor Drives ◽  
Precise Positioning ◽  
Feed Drive ◽  
And Performance ◽  
Precision Machine Tools

Linear motor drives (LMDs) are well known to provide significant advantages in terms of positioning speed and precision over traditional screw drives (SDs), making them better suited for high-speed, high-precision machine tools. However, their use in such machine tools is limited by their tendency to consume a lot of electrical energy and cause thermal issues that help drive up costs. A hybrid feed drive (HFD) has been proposed as a possible solution to this dilemma. The HFD combines LMD and SD actuation to achieve speeds and accuracies similar to LMDs while consuming much less energy. This paper explores control strategies to further improve the performance of the HFD without unduly sacrificing its efficiency. First, it highlights two performance limitations of the controller proposed for the HFD in prior work, namely, imperfect tracking and suboptimal feedback gains. Then it compares two approaches for achieving perfect tracking with regard to performance and energy efficiency. Finally, it presents an approach for optimizing the feedback gains of the HFD to achieve the best positioning performance. Simulations and experiments are used to demonstrate significant gains in precise positioning using the methods proposed in this paper, while maintaining superb energy efficiency relative to an equivalent LMD.

Study on High Speed Feed Drive System for Machine Tools -Improvement of PID Control Parameter-

1993 ◽  
Vol 5 (4) ◽  
pp. 357-362
Author(s):  
Toshitake Tateno ◽  
◽  
Hiromu Nakazawa ◽  
Keyword(s):  
Pid Control ◽  
Machine Tools ◽  
High Speed ◽  
Drive System ◽  
Control Parameters ◽  
Hydraulic Actuator ◽  
Feed Drive ◽  
Large Size ◽  
Cutting Operation ◽  
Feed Drive System

In order to realize feed rate of 20m/min for cutting operation of medium and large size machine tools, a new high speed and high accuracy feed drive system which has a servomotor and ballscrew combined with a hydraulic actuator has been developed. As stated in a previous paper this system can drive ten times faster than conventional rate with considerable accuracy. This paper describes a method for determining optimal PI control parameters of the electric servomotor and PD control parameters of the hydraulic actuator. In order to make the best use of the hydraulic actuator a new function which compares the force of electric servomotor with that of hydraulic actuator is proposed. The experimental results show that the controlling parameters determined by this method reduce motor power and the method is proved to be effective.

scholarly journals Geometric Method for Estimating Shading Degree of Objects in Solar Industry

2021 ◽  
Author(s):  
Leonid Markin ◽  
Lyudmila Bobrik
Keyword(s):  
Energy Efficiency ◽  
High Speed ◽  
Life Support ◽  
Geometric Model ◽  
Clean Energy ◽  
Effective Area ◽  
Solar Panels ◽  
Processor Time ◽  
And Performance ◽  
Problem Setting

The paper presents a geometric model for evaluating the effective area of photovoltaic solar panels, taking into account their shading cast upon the object when it is exposed to a solar flux directed as it has been set. The relevance of such research is due to the fact that solar energy is a source of ecologically clean energy on earth, in space - it is often the only source of life support for inhabited space stations and future extraterrestrial settlements. It describes problem setting, namely physical and mathematical approaches to evaluating energy efficiency of pho- tovoltaic solar panels. To estimate energy efficiency, we have chosen a voxel geometric model which samples the normal working area. The developed voxel geometric model differs from others significantly, namely it employs 4-digit code instead of 2-digit. Such multi-digit feature allows the solving algorithm to “trace” the shade source quickly when calculating the total effective area of photovoltaic solar panels. The paper presents the software implementation of the described geometric model, the graphical shell, and the results of verification of the afore- said geometric model. The results of its testing (estimates of accuracy and performance) are given. This results showing sufficient accuracy for practice and high speed of calculations (less than 10 seconds of processor time).

scholarly journals Minimization of the Energy Consumption in Industrial Robots through Regenerative Drives and Optimally Designed Compliant Elements

2020 ◽  
Vol 10 (21) ◽  
pp. 7475
Author(s):  
Ilaria Palomba ◽  
Erich Wehrle ◽  
Giovanni Carabin ◽  
Renato Vidoni
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Design Method ◽  
Electrical Energy ◽  
Motor Drives ◽  
Industrial Robots ◽  
Test Cases ◽  
Electrically Actuated ◽  
System Energy ◽  
The Relationship

This paper describes a method for reducing the energy consumption of industrial robots and electrically actuated mechanisms performing cyclic tasks. The energy required by the system is reduced by outfitting it with additional devices able to store and recuperate energy, namely, compliant elements coupled in parallel with axles and regenerative motor drives. Starting from the electromechanical model of the modified system moving following a predefined periodic path, the relationship between the electrical energy and the stiffness and preload of the compliant elements is analyzed. The conditions for the compliant elements to be optimal are analytically derived. It is demonstrated that under these conditions the compliant elements are always beneficial for reducing the energy consumption. The effectiveness of the design method is verified by applying it to two test cases: a five-bar mechanism and a SCARA robot. The numerical validations show that the system energy consumption can be reduced up to the 77.8% while performing a high-speed, standard, not-optimized trajectory.

scholarly journals Evaluation of control strategies using an oxidation ditch benchmark

2002 ◽  
Vol 45 (4-5) ◽  
pp. 151-158 ◽  
Author(s):  
A. Abusam ◽  
K.J. Keesman ◽  
H. Spanjers ◽  
G. van Straten ◽  
K. Meinema
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Control Strategies ◽  
Treatment Plant ◽  
Electrical Energy ◽  
Performance Criteria ◽  
Oxidation Ditch ◽  
Flow Splitting ◽  
And Performance ◽  
Specific Oxidation

This paper presents validation and implementation results of a benchmark developed for a specific full-scale oxidation ditch wastewater treatment plant. A benchmark is a standard simulation procedure that can be used as a tool in evaluating various control strategies proposed for wastewater treatment plants. It is based on model and performance criteria development. Testing of this benchmark, by comparing benchmark predictions to real measurements of the electrical energy consumptions and amounts of disposed sludge for a specific oxidation ditch WWTP, has shown that it can (reasonably) be used for evaluating the performance of this WWTP. Subsequently, the validated benchmark was then used in evaluating some basic and advanced control strategies. Some of the interesting results obtained are the following: (i) influent flow splitting ratio, between the first and the fourth aerated compartments of the ditch, has no significant effect on the TN concentrations in the effluent, and (ii) for evaluation of long-term control strategies, future benchmarks need to be able to assess settlers' performance.

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