Thursday, February 25, 2010

Modeling of Magnetic Levitation System

Magnetic Levitation System Modelling
Figure 2 below shows the simplified diagram of Maglev
system (adapted from Feedback Instrument Ltd.

Figure 2. Simplified Maglev System Diagram
The photo-sensors measure the ball’s position. Corresponding
to the ball’s position from the electromagnet,
the sensor generates a voltage output (Vsensor) obeying
the following relation:

Magnetic Levitation System description and modelling
This work was concerned with the dynamics of the Feedback Magnetic Levitation System c° , which is depicted in Figure 1. Magnetic Levitation Circuit The infrared photo-sensor is assumed to be linear in the required range of operation, yielding a voltage y that is related to distance h as y = °h + y0, where the gain ° > 0 and the offset y0 are such that y 2 (−2V, +2V ). Current i is regulated by an inner control loop, and is linearly related to the input voltage u as i = ½u + i0 with ½ > 0 and i0 > 0.

The working excursion of u is limited between −3V (corresponding to a null coil current) and +5V (saturation value). Rates of change larger than 50V/s for u cannot be implemented by the current driver along its entire working range.


Abstract. The electromagnetic levitation system (MLS) is a mechatronic system already
acknowledged and accepted by the field experts. Due to a synergic integration of the sensorial elements, the control subsystem and the actuating subsystem, the mentioned levitation system becomes an especially recommended subject in the academic curricula for mechatronic study programmes. This paper intends to initiate the investigation of different modelling, simulation and control possibilities for a magnetic levitation system starting from a real, physical reference model.

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