This paper discusses the development of position sensors for mechatronic applications. In particular, these sensors were developed for magnetic bearings which require position sensing of the rotor relative to the stator.
Magnetic beaings are open loop unstable, and therefore, require closed loop control of rotor position to centrally position the rotor relative to the circular bearing stator. Therefore, the position sensors are required to have high sensitivities and good resolution. In addition, electro magnetic interference (EMI) rejection and drift need to be taken into account in designing or selecting sensors for magnetic bearings, as often the magnetic bearing is operating in an environment of strong electro magnetic fields.
This paper discusses displacement measuring sensor system types and the performance of units developed for high speed rotating systems and micro-scale units for mm scale magnetic bearings. The reasons to choose a particular type of sensor are discussed and the performance of inductive sensors in particular are presented. The discussion will also focus on properties of sensing coils and signal conditioners for macro as well as micro magnetic bearings.
This paper presents a new method for accurate real time counting of passengers using discrete representation processing techniques. In order to minimize computational costs and problems with moving objects in the image overlapping each other, a specially designed discrete representation method is developed based on analyzing the objects in the discrete representation with an object center's line on the object trigger points sequence. It is planned to implement the algorithm on a personal computer to produce a real time working system.
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