Abstract:The hydraulic energy of the traditional ball-borne electro-hydraulic servo system uses a brushed DC motor to drive a constant pressure variable pump. The pump source pressure is set constant during the missile flight. The low demand results in low overall energy utilization of the bomb. Therefore, a brushless DC motor driven small displacement hydraulic pump for pressure control is proposed to reduce the system pressure appropriately during low aerodynamic load phases, thereby reducing throttling losses and Leakage and improve energy efficiency. The flow-pressure characteristic curve of variable-speed fixed-quantity pumps is analyzed. By establishing a mathematical model and simulation model of the position electro-hydraulic servo system based on variable-speed pressure-controlled pump sources, the position tracking and system of the variable-speed fixed-rate pumps under typical operating conditions are analyzed. The pressure change and energy utilization efficiency verify that the system can effectively improve the system's efficiency under the premise that the missile's level flight segment can ensure that the position servo system can effectively track it, and proves the effectiveness and feasibility of the variable speed quantitative pump pressure control system.