Development and key technologies of pure electric construction machinery

Abstract With global warming and the energy crisis becoming more serious, the emission regulations for construction machinery (CM) are increasingly strict. The pure electric drive system is an inevitable trend for CMs. Although the pure electric drive system is widely used in the industry field and some technologies have been successfully transplanted to the mobile machines, it's not easy for CMs to realize the electrification. Types of pure electric CM (PECM) are discussed firstly to give a glance at PECM. Then the characteristics of a pure electric system for CMs are introduced. Key technologies, like variable speed control of the electric motor (EM), hydroelectric EM driving, new hydroelectric actuator, power supply, and energy recovery, are analyzed in depth. The difficulties of CMs to realize the electrification by comparing the difference between the pure electric power used in CM and the pure electric power used in the other fields. Moreover, the researches and developments in the pure electric drive systems for CMs are introduced. Finally, the challenges that researchers and the CM manufacturers will face are forecasted.