A methodology for the design of passive or semi-active electromechanical dampers has been presented in this article. The study is motivated by the fact that similar devices proposed in the literature are characterized by an excessive weight. The large weight constitutes one of the strongest reasons against their application in the automotive field. The aim of the design methodology described in the present paper is to obtain a considerable reduction of the weight. To this end a configuration of the damper based on a rotational electric motor with NdFeB permanent magnets has been considered due to the high torque and power density that characterizes these electric machines. The rotation of the motor is then transformed into linear motion by means of a mechanical transmission e.g. of a ball screw or a lever. The methodology is based on the study of the behavior of the electromechanical damper including its mechanical and electrical dynamics. It evidences that the design is driven by a few number of parameters involving the mechanical and the electrical variables. The application of the design methodology to a segment C vehicle suspension leads to a solution of a 21% heavier mass than a continuously variable hydraulic damper. This is posed in the literature for similar specifications lead to devices whose mass is usually several times heavier. A dynamic model of the suspension including the electromechanical damper demonstrates that the effects of the added masses and inertia is not large and produces a small shift of the natural frequencies considered.
Electromagnetic shock absorbers for automotive suspensions: electromechanical design
Elektromagnetische Stoßdämpfer für Fahrzeugaufhängungen: elektromechanischer Entwurf
2006
10 Seiten, 8 Bilder, 2 Tabellen, 13 Quellen
Aufsatz (Konferenz)
Englisch
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