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This paper presents the study and implementation of a different field-oriented control strategy using a generalized predictive control (GPC) technique applied to the mechanic position loop aiming to obtain a system that acts in the fractional horsepower motor driver running at near zero frequency. The position and speed loops were identified to verify the system behavior and, from the model found design the GPC controller. Simulation and experimental results are shown and discussed to demonstrate the merit of the proposed approach and the performance and robustness of the algorithms have been evaluated.

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In material handling applications where high precision, very long tracks and closed paths are required, short primary linear drives are proposed. The short primary type uses an active vehicle (moving winding) on a passive track (stationary magnets or induction rail). To implement this topology, this paper presents a combined operation of a short permanent magnet linear synchronous motor (PMLSM) and a linear induction motor (LIM). The costs can be reduced considerably by using a simple induction rail, instead of permanent magnets on the track. The control unit and converters are mounted on board of the active vehicle. A contactless energy transmission provides the average power and an ultracapacitor bank provides the peak power demanded by the active vehicle via a bidirectional DC-DC converter. The field oriented control, the drive control, the machine model and the control structure are based on field oriented control (FOC) using the rotating ABreference frame. The transition control strategy is described and experimental results demonstrate the transition between sections with permanent magnets and induction rail.

This paper presents a CAD software which uses a methodology to resize the induction motor (IM) winding, by increasing the number of parallel conductors as a means of increasing the efficiency. Such winding resize does not change the shape of the core and slots. Here, parallel conductors with smaller diameters are utilized in the chorded coils. As result, the efficiency and the cost for the resized IM are presented and discussed.

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The potential for very long tracks, multiple vehicles travelling at high speed, high positioning repeatability and rapid acceleration turns the short primary linear drive into a good candidate for use in material transfer and processing lines. To implement this system, the linear motor was designed for synchronous and induction operation, since the costs can be considerably reduced by using a simple induction rail at the long transporting sections, instead of permanent magnets. This study is focused on the vehicle motion control strategy of a short primary linear drive, in order to regulate the speed without jerks. The implemented control algorithm for both the operations is based on a field oriented control, which uses a moving AB-reference frame. The position information was obtained by using a magneto-resistive incremental encoder, which was mounted on the vehicle, and a magnetic linear scale, which was installed along the passive track. Furthermore, force generation which depends on the vehicle's position will be discussed. Finally, experimental tests are performed to demonstrate the feasibility of the employed control strategy.

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