Abstract
The heavy electric forklift adopts a high-voltage system with fast charging speed and a large amount of recoverable potential energy. Energy recovery can prolong the operation time and improve the overall efficiency of the machine significantly. The energy recovery system has a large flow range, and the system of a single hydraulic motor-permanent magnet synchronous motor cannot meet the actual working needs of the heavy electric forklift. This paper proposes a new energy recovery system with dual hydraulic motors and permanent magnet synchronous motors. The system has two work modes, single and dual modes. The system operates in the single mode for a low flow rate and the dual mode for a high flow rate. Experimental research on energy recovery efficiency and dynamic characteristics is carried out. The experimental results show that power generation efficiency is above 50% within a certain speed range.
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