Implementation of a Field-Oriented Control Strategy for Electromagnetic Shock Absorbers

Abstract

Chassis electrification is paramount in the automotive transition towards emission reduction and automated driving. In this context, electromagnetic shock absorbers are regarded as a promising technology for chassis control. They enhance the suspension with active and passive forces by means of a suitably interfaced and controlled electric machine. To this end, Field-Oriented Control is commonly adopted for brushless permanent-magnet machines. However, the suspension experiences impulsive forces at high speed, when the vehicle undergoes through bumps or potholes. Thus, a field-weakening strategy must be included to guarantee stable and efficient operation in the aforementioned conditions. This paper presents the implementation of a field-oriented control strategy with field weakening. Laboratory testing is carried out on a three-phase permanent-magnet synchronous motor of an electro-hydrostatic shock absorber.