DSP based implementation of piecewise linear control scheme for wide air-gap control of an electromagnetic levitation system

There has been wide interest in the control scheme of the electromagnetic levitation system due to its disadvantages of nonlinearity and open-loop uncertainty. A typical coil-ball levitation system is used in research. The forces of the ball are analyzed and a dynamic model of the whole electromagnetic levitation system is established. Based on the nonlinear state-space model, the coil-ball system is linearized and then a LQR control approach is proposed. Simulation results show that, compared with conventional pole assignment scheme, the electromagnetic levitation system under the proposed control approach gets a better performance, including smaller overshot and faster response.

Download Full-text

Extension of operating air-gap in electromagnetic levitation system by using intelligent controllers

International Journal of Automation and Control ◽

10.1504/ijaac.2018.095102 ◽

2018 ◽

Vol 12 (4) ◽

pp. 526

Author(s):

Subrata Banerjee

Keyword(s):

Electromagnetic Levitation ◽

Air Gap ◽

Levitation System ◽

Intelligent Controllers

Download Full-text

Genetic Algorithm Based Optimization of Controller Parameters for an Electromagnetic Levitation System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.3900 ◽

2011 ◽

Vol 403-408 ◽

pp. 3900-3908

Author(s):

Rupam Bhaduri ◽

Subrata Banerjee ◽

Mrinal Kanti Sarkar

Keyword(s):

Genetic Algorithm ◽

Small Variation ◽

Electromagnetic Levitation ◽

Air Gap ◽

Track Record ◽

Wide Range ◽

Control Schemes ◽

Levitation System ◽

Controller Performance ◽

Different Types

Electromagnetic levitation system (EMLS) is inherently unstable and strongly non-linear in nature. Controllers based on linear model and designed by classical approach for any EMLS have restricted zone of operation. For a small variation of operating air-gap there is sharp degradation of controller performance. But it is essential to design an optimized controller that will stabilize unstable EMLS and will provide satisfactory performance for a wide range of operating air-gap. In this paper a Genetic Algorithm (GA) based optimisation technique for controllers of two actuator based levitation system has been discussed. GA has a highly proven track record of optimisation of parameters for different types of control schemes. Here the work focuses mainly on an optimal control of a proposed two actuator based EMLS scheme, which is composed of a stochastic technique based on Genetic Algorithm (GA).

Download Full-text

Influence of Adaptive Gap Control Mechanism and Tool Electrodes on Machining Titanium (Ti-6Al-4V) Alloy in EDM Process

Materials ◽

10.3390/ma15020513 ◽

2022 ◽

Vol 15 (2) ◽

pp. 513

Author(s):

Shoufa Liu ◽

Muthuramalingam Thangaraj ◽

Khaja Moiduddin ◽

Abdulrahman M. Al-Ahmari

Keyword(s):

Titanium Alloy ◽

Tungsten Carbide ◽

Control Mechanism ◽

Air Gap ◽

Tool Electrode ◽

Discharge Energy ◽

Linear Action ◽

Control Scheme ◽

Gap Control ◽

Edm Process

Titanium alloy is widely used for orthodontic technology and easily machined using the EDM process. In the EDM process, the workpiece and tool electrode must be separated by a continuous air gap during the machining operation to generate discharge energy in this method. In the present study, an endeavor was made to analyze the effects of a servo feed air gap control and tool electrode in the EDM process. The developed mechanical setup consists of a linear action movement with zero backlash along the X-axis, which can be controlled up to 0.03 mm. It was observed that the suggested air gap control scheme can enhance the servo feed mechanism on a machining titanium alloy. A tungsten carbide electrode can enhance the surface measures owing to its ability to produce tiny craters with uniform distribution. Since it produces a little crater and has a higher melting point, a tungsten carbide electrode can create lesser surface roughness than a copper tool and brass tool electrode.

Download Full-text