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In commercial medium-voltage vacuum contactors, widely used for grid management, the linear motion required for the actuation of contacts is often generated by a linear actuator. Aiming to investigate alternatives from an industrial point of view, a rotary actuation system based on a switched reluctance motor and a suited coupling mechanism was developed. The design process, based on a mechatronic...
This paper illustrates the development, up to prototype stage, of an electromechanical actuation system for a medium-voltage vacuum contactor. Such development is carried out using a multi-domain simulation-based mechatronic approach, i.e. developing coordinated sub-models for the mechanism linking the actuator to the movable parts of the interrupter, the rotational electromagnetic actuator, and the...
An improved predictive current controller for active shunt power filters is proposed in this work. The algorithm is based on the conventional deadbeat control and introduces a modified approach to compensate for delays incurred through digital implementation of the control, by predicting a system behaviour one and two sample instants in advance with respect to the measurement instant. Compared with...
Rotary-linear motors, able to provide both force and torque along the same axis, represent an interesting solution for managing combined linear and rotary motions along the same direction, as alternative to the usual employ of 2 separated normal motors. Anyway, rotary-linear machines are often either relatively expensive to manufacture or rather complicated to control. A novel type of brushless permanent...
Permanent magnets synchronous machines are used in many different applications. While the popular surface magnets isotropic variant is the simplest to manufacture and control, its relatively low airgap flux density limits the specific performances that are further reduced when a bandage is used to retain magnets. The different buried magnets variants may be tailored to improve the most relevant aspects,...
This paper investigates the application of an improved dead beat digital control strategy to a 3-phase shunt active filter used for compensation of load harmonics in aircraft power systems. Due to the high rated frequency (400 Hz) such applications result particularly demanding for both power and control devices. To compensate the inherent delay of digital control systems, a simple method for predicting...
Wind generators represent a very interesting means for renewable energy harvesting, both grouped in large grid-connected farms and as small units contributing to supply isolated loads such as farms or villages located in remote regions. This paper describes the structure and control of a small-size self-orienting fixed-pitch wind genset using a 3-phase permanent magnets synchronous machine connected...
The combination of a rotary and linear motion along the same axis is used in several applications, including tooling machines, robotics, automation etc. It may be also used to conveniently manage pairs of basic functions of active wheels in electric and hybrid vehicles. In such cases, rotary-linear machines may represent an interesting alternative to the usual employ of a separated actuator per each...
Utilities often provide power supply via standard 1-phase low-voltage AC feeders, at least in the range up to several kVA. In rural areas and developing countries, even MV 1-phase distribution grids are sometimes used. Nevertheless, 3-phase load appliances are often preferable: in such case, apparatuses able to effectively convert 1-phase feeders into standard 3-phase supplies are then required. After...
With the advance of digital control hardware the simple but effective proportional-integral-derivative (PID) control technology is moving towards a higher level of performance and robustness. A more general class of variable structure (VS) PID has derived from original PIDs to improve their performances and capabilities. This paper revises the main properties of VS regulators and proposes a novel...
Mainly due to historical and convenience reasons, for power levels up to several kVA electric utilities provide power distribution typically uses 1-phase a.c. feeders, despite a 3-phase supply would be technically preferable permitting for instance to use more efficient and compact induction motors, 3-phase rectifiers providing lower output ripple etc. This paper deals with a simple converter able...
Due to historical reasons, the most diffused solution for electric energy transmission is via fixed voltage and frequency a.c. grids. A 3-phase symmetric supply results typically preferable; anyway, due to practical reasons 1-phase feeders are mostly used for low-power final distribution up to several kVA. This paper deals with a low-complexity converter that was recently proposed to provide a high...
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