PROJECT TITLE :

Optimum Design of a Moving Coil Actuator for Fast-Switching Valves in Digital Hydraulic Pumps and Motors

ABSTRACT:

Fast-switching seat valves suitable for digital hydraulic pumps and motors utilize direct electromagnetic actuators, which must exhibit superior transient performance to allow economical operation of the fluid power pump/motor. A moving coil actuator resulting during a minimum valve switching time is designed for such valves using transient finite-part analysis of the electromagnetic circuit. The valve dynamics are coupled to the fluid restrictive forces, which considerably influence the effective actuator force. Fluid forces are modeled based on transient computational fluid dynamics models. The electromagnetic finite-component model is verified against experimental measurement, and used to style an optimum moving coil actuator for the applying considering totally different voltage-current ratios of the ability provide. Results show that the optimum style depends on the provision voltage-current ratio, however, the minimum switching time obtained is nearly freelance on this voltage-current ratio. Selecting a suitable power offer primarily based on thermal issues yields a switching time simply higher than one millisecond for a travel length of 3.five mm while submerged in oil. The proposed valve includes a pressure drop below zero.5 bar at 600 L/min flow rate, enabling economical operation of digital hydraulic pumps and motors.