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The realization of electromagnetic devices may implies the presence of local losses caused by material defects or by magnetic anomalies caused by mechanical processing. The problem of such defects location is the object of the present work; the aim of obtaining information about imperfections or defects with a non invasive inspection has been pursued. The adopted approach is based on the observation...
In the recent past the authors dedicated much work to small PM motor adopting permanent bonded magnets, and to the magnetization problems. Now it is largely proposed the so-called Halbach magnetization, presenting the directions of the magnetic induction variable along the magnet; its constitutes a tentative of sinusoidality for the magnetic induction component orthogonal to the magnet surface. It...
The recent activity of the authors, concerning different types of small PM machines, brought to the necessity to measure the respective cogging torques. Normally such a measure (including the hysteresis and bearing torque components), is realized with a prime motor to drag the machine under exam at very low speed and adopting a very good gearbox (classical method). During the activity a new method...
The Authors operate in the field regarding the development and realization of small electromagnetic and electromechanical devices, and the study of the required magnetic materials; for that purpose the availability of a method for evaluating with discrete accuracy the distribution of the iron losses in such devices should be very useful. At that aim a methodology is here proposed based on the use...
Several applications adopt electromagnetic sensors, that base their principle on the presence of magnets realized with specific magnetic materials that show a rather high remanence, but low coercivity. This work concerns the production, analysis and characterization of hybrid composite materials, with the use of metal powders, which aim to reach those specific properties. In order to obtain the best...
With regard to small DC brushless motors the problem of the cogging torques amplitude is considered. At the aim a special motor prototype, obtained by the substitution of the original ferrite magnets with bonded magnets prepared in the own laboratories, has been realized; such a prototype assumes the role of "reference motor" as regards some quantities introduced as "quality factors"...
Bonded magnets are giving promising results when adopted to replace expensive rare earth magnets. The possibility to “modulate” the magnetic characteristics by varying the binder percentage allows the opening of new lines of investigation and to face the problem of rare earths cost. In the paper a small power generator prototype has been equipped with bonded magnets realized in the Authors' Laboratories;...
The problem of evaluating the impact on the efficiency consequent to the adoption of bonded magnets in substitution of ferrites in small permanent-magnet machines is faced. That is necessary for the development of the main object of this paper: The evaluation of the obtainable performances of a specific brushless dc motor fractional motor through simple substitution of bonded magnets proposed by the...
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