The design of hybrid electromechanical valve actuator: Effects of construction parameters

In this paper, a novel modified cylindrical core, axis symmetric, low-inductance, hybrid permanent magnet (PM)/electromagnet (EM) magnetomotive force (MMF) actuator is proposed for variable valve timing camless engine. The new design provides large magnetic force with low energy consumption (startup and holding force), permanent magnet demagnetization isolation and improved transient response. The design and construction parameter sensitivity simulation results confirm the force of approximately 200 N (in the presence of coil current) and 500 N (in the absence of coil current) at equilibrium position and armature seat, respectively. An improvement in transition time due to low coil inductance, flexible control with parallel coils and 41.96% low energy dissipation is observed.