Title :
Effect of driving electric machine type on the system efficiency of an industrial forklift
Author :
Minav, T.A. ; Laurila, L.I.E. ; Pyrhönen, J.J.
Author_Institution :
Dept. of Electr. Eng., Lappeenranta Univ. of Technol., Lappeenranta, Finland
Abstract :
Electric drives offer effective means of directly controlling working machine hydraulic movements instead of using traditional valve control. This paper takes a step further and investigates the effect of the electric machine type applied in a direct electro hydraulic drive on the system efficiency of the electric energy recovery system of a hydraulic forklift. The control of the system is implemented directly with an electric motor drive without any control valves. A theoretical model is made and the model is verified by practical results. Permanent magnet motor and squirrel cage induction motor drives are compared. Finally, possible improvements of the efficiency in the suggested system are estimated.
Keywords :
electrohydraulic control equipment; fork lift trucks; hydraulic drives; induction motor drives; permanent magnet motors; squirrel cage motors; valves; direct electro hydraulic drive; driving electric machine type effect; electric drive; electric energy recovery system; electric motor drive; industrial forklift; permanent magnet motor; squirrel cage induction motor drive; valve control; working machine hydraulic movement; Batteries; Induction motors; Payloads; Permanent magnet motors; Pumps; Synchronous motors; Valves; Electric drive; Induction Machine (IM); Permanent Magnet Synchronous Machine (PMSM); energy efficiency; hydraulics; mobile machine; potential energy recovery; system efficiency forklift;
Conference_Titel :
Electrical Machines (ICEM), 2012 XXth International Conference on
Conference_Location :
Marseille
Print_ISBN :
978-1-4673-0143-5
Electronic_ISBN :
978-1-4673-0141-1
DOI :
10.1109/ICElMach.2012.6350150
