Linear Electric Machine Design for an Off-Highway Vehicle Hydraulic Charge Pump

Significant reductions in US energy consumption and greenhouse gas emissions can be obtained through electrifying heavy-duty agriculture, construction, and mining vehicles. The extreme power transients and power density of these vehicles are fundamentally different from passenger vehicles, requiring that new electrification paradigms be developed. This paper proposes the electrification of a hydraulic charge pump by using a linear oscillatory machine integrated with a piston pump. The charge pump application is described, suitable linear machine technology for the application is reviewed, and a multi-objective optimization is performed on two potential machine topologies based around a tubular permanent magnet linear machine. A scaling procedure is investigated to allow the machine's power rating to be scaled while preserving the design performance.