Electromagnetic suspension apparatus

An electromagnetic suspension apparatus comprising:

• an electromagnetic actuator that is provided in parallel with a spring member provided between a vehicle body and a wheel of a vehicle and generates a driving force related to vibration damping of the vehicle body;
• an information acquisition unit that acquires information on a stroke position of the electromagnetic actuator;
• a spring control force calculation unit that calculates a spring control force generated by the electromagnetic actuator based on the stroke position acquired by the information acquisition unit;
• a relative speed correlation value calculation unit included in the information acquisition unit that calculates a relative speed correlation value between a sprung member and an unsprung member with respect to the spring member in the vehicle body;
• and
• a driving force control unit that calculates a target driving force of the electromagnetic actuator based on the relative speed correlation value calculated by the relative speed correlation value calculation unit and the spring control force calculated by the spring control force calculation unit, and controls a driving force of the electromagnetic actuator using the calculated target driving force;
• wherein
• when the stroke position acquired by the information acquisition unit is in a neutral range including a neutral position, the driving force control unit corrects the target driving force so as to reduce a spring force related to the spring member as compared with when the stroke position is in a non-neutral range.