G. Gianolio

Novel axial flux machine for aircraft drive: design and modeling

A novel brushless ac permanent-magnet motor is described. This is intended for use as a highly efficient machine for a propeller-driven stratospheric aircraft. The machine is lightweight because of the use of plastics for the structural elements. A form of modeling is described in which the parameters for a decoupled equivalent circuit are calculated by three-dimensional finite-element analysis of a module of the machine. Matlab is then used to simulate the equivalent circuit action. It is shown that the fundamental component of the current waveforms agrees closely with a simple analysis approach.

Fuel cells for electric power generation: Peculiarities and dedicated solutions for power electronic conditioning systems

Abstract The Fuel Cells (FCs) output power is usually generated at low DC voltage. The output voltage is not constant and it depends on the operation conditions. Furthermore, the FC dynamic response is slower than the transients typically requested by loads; hence, in many applications, the FC generators must be interfaced with the loads and the other possible energy/power sources. For these reasons, the FC stack output power and/or the batteries/supercapacitors input/output power must be conditioned by means of an electronic power converter. The purpose of the paper is to present the main issues related to the conditioning of FC power output; in particular, considering the specific requirements of the interface electronic converters in the two most important applications: micro distributed generation (or cogeneration) and the transportation systems. The paper mainly discusses the basic circuit topologies of the DC/DC converters dedicated to the FC power conditioning, in particular considering the Proton Exchange Membrane FC technology

PM linear synchronous motors normal force calculation

The intent of this work is to calculate the normal force generated between the stator and the moving cursor of PM linear synchronous motors. The normal force, related to the airgap width and to the cursor position, for different motor configurations, is calculated by using two different methods: the finite element method; and the virtual displacement principle. The theoretical approach and the complete numerical results are shown in the paper.

Novel axial flux machine for aircraft propeller drive: design and modelling

Summary form only given. The objective of work. the work is part of the EU funded Helinet project for a telecommunications infrastructure based on unmanned stratospheric aircraft. The unconventional multi-disc axial flux brushless AC permanent magnet machine considered for the aircraft propeller drive system is described in this paper under the design and modeling point view.

Novel PM linear motor for industrial applications: magnetic circuit design procedure

Introduction Linear motor drive systems are becoming an alternative solution to standard rotational motor drives in several industrial applications. In practice. linear motors can be used to carry Out controlled l iear movements without using any mechanical interface. The principle of linear motors operation is the electromagnetic interaction between the stator and the cursor that origins the thrust jn the machine. On the other hand, the lateral force is the most important undesired effect generated by the same magnetic interaction To design a linear motor the traditional approach using design formula gives good results only in the preliminary design stage. the E M tools are required to compute the lateral force. In addition 2-D and 3-D finite element analyses can be performed to get the motor overall parameters and to verify the motor performance in any working conditions In industrial applications. synchronous linear motors seem to be the most attractive solution and this study is related to a contactless system based on a magnetic suspension Applications of these systems are in ultra clean and maintenance free rooms or where wear and maintenance would cause expensive plant out of Service In our study. because the motor has to work in an environment where the moving pan cannot be fed using a cable. this following innovative solution has been chosen the stator and not the cursor is supplied through a variable voltage, variable frequency supply As a consequence, a Double Side stator with and an internal IronLess cursor Motor @SUM) has been realised (Fig I): each stator side is composed by a three phase mil assembly encapsulated in the iron structure and the cursor is composed by an even number of permanent magnets (PM), mounted in alternated polarity and encapsulated in an amagnetic (ironless) structure [I] Peculiarity of this kind of structure is the reduced lateral force in comparison with other linear motor configurations [2].

Design and performance evaluation of a PM linear synchronous motor with magnetic guides for industrial applications

A new linear motor for industrial applications to be coupled with a magnetic levitation guidance system has been designed. The motor is a PM linear synchronous motor with the PM on the cursor: the moving part does not have to be supplied. Applications of these systems can be found in ultra clean and maintenance free rooms or where wear and maintenance would cause expensive plant stops. The motor is coupled with a magnetic system realised by coupling magnetic guides. This solution requires that the motor generates a low normal force and can work also with the cursor not exactly in the nominal position. The traditional motor design has been integrated with the finite elements method (FEM) in order to predict the motor behaviour from the electromagnetic point of view (magnetic field distribution, thrust, normal forces, equivalent parameters, etc.).

Parameters and forces of a PM linear synchronous motor with magnetic guides for industrial applications: computed and experimental results

A novel type of linear motor characterized by two stators and one ironless cursor, double side ironless motor (DSILM), has been designed. The motor has been designed to drive autonomous complete contactless transportation systems, equipped with a magnetic levitation system. Applications of these systems can be found in ultra clean and maintenance free rooms or where wear and maintenance would cause expensive plant stops, The design have been performed integrating traditional formulae and the 2D and 3D FEM simulations. In particular, the evaluation of the normal force generated by this kind of motor can only be done performing FEM analyses. A test bench with a linear motor prototype as been constructed and an experimental validation of the design results has been performed. The experimental tests have been performed in order to evaluate the model parameters, the field distribution and the propulsion force. In the paper, the design procedure and the comparisons between the design predictions and the experimental results are presented.