Electrically powered suspension system

An electrically powered suspension system mounted between a body and a wheel of a vehicle, comprising an electromagnetic actuator generating a driving force for vibration damping of the vehicle, wherein

• a linear motor of the electromagnetic actuator includes a cylindrical rod member and a hollow cylindrical housing surrounding the rod member and extending along an axis of the rod member;
• the rod member and the housing are arranged so as to freely move back and forth along the axis with respect to each other;
• the rod member is configured to include a cylindrical shaft and a hollow cylindrical pipe surrounding the cylindrical shaft;
• the cylindrical shaft and the hollow cylindrical pipe are arranged concentrically with each other;
• the cylindrical shaft is made of a conductive member and the hollow cylindrical pipe is made of a nonconductive member;
• a plurality of armature coils are provided in a stacked state along the axis in a circumferential gap defined by an outer peripheral wall of the cylindrical shaft and an inner peripheral wall of the hollow cylindrical pipe inside the rod member;
• the housing is provided with a magnet member that exerts electromagnetic induction with each of the plurality of armature coils provided on the rod member, and
• armature coils located on ends of the rod member among the plurality of the armature coils are provided with electromagnetic braking parts that restrict back and forth movements of the rod member and the housing with respect to each other along the axis;
• the electromagnetic braking part includes a short-circuit part in which a pair of terminals provided in each of the armature coils located on the ends of the rod member are short-circuited;
• the back-and-forth movements are suppressed by the electromagnetic induction caused between the short-circuit part and the magnet member provided in the housing;
• and
• the pair of terminals included by the armature coil on the ends of the rod member in the short-circuit part are isolated from a control power supply line for supplying control power to the plurality of the on-rod armature coils to be short-circuited therebetween.