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**Topic under **Control Engineering

**Source:** ee.sharif.edu

**File size:** **753.48 KB**

**File type:** **pdf**

**Last download on:**
Thu Apr 12, 2018 03:34:52 AM

__Short Desciption__:

Magnetic
Levitation System 2EM
(MLS2EM)
User’s Manual, The Magnetic Levitation System with 2 Electromagnets (MLS2EM) is a complete (after
assembling and software installation) control laboratory system ready to experiments.

__Summary__:

Introduction
The Magnetic Levitation System with 2 Electromagnets (MLS2EM) is a complete (after
assembling and software installation) control laboratory system ready to experiments. The
is an ideal tool for demonstration of magnetic levitation phenomena. This is a classic
control problem used in many practical applications such as transportation - magnetic
levitated trains, using both analogue and digital solutions to maintain a metallic ball in an
electromagnetic field. MLS2EM consists of two electromagnets, the suspended hollow steel
sphere, the sphere position sensors, computer interface board and drivers, a signal
conditioning unit, connecting cables, real time control toolbox and a laboratory manual.
This is a single degree of freedom system for teaching of control systems; signal analysis,
real-time control applications such as MATLAB. MLS is a nonlinear, open-loop unstable
and time varying dynamical system. The basic principle of MLS operation is to apply the
voltage to an upper electromagnet to keep a ferromagnetic object levitated. The object
position is determined through a sensor. Additionally the coil current is measured to
explore identification and multi loop or nonlinear control strategies. To levitate the sphere
a real-time controller is required. The equilibrium stage of two forces (the gravitational and
electromagnetic) has to be maintained by this controller to keep the sphere in a desired
distance from the magnet. When two electromagnets are used the lower one can be used for
external excitation or as contraction unit. This feature extends the MLS application and is
useful in robust controllers design. The position of the sphere may be adjusted using the
set-point control and the stability may be varied using the gain control. Two different
diameter spheres are provided. The band-width of lead compensation may be changed and
the stability and response time investigated. User-defined controllers may be tested.

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