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Permanent Magnet Synchronous Machine Sizing: Effect on the Energy Efficiency of an Electro-Hydraulic Forklift

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3 Author(s)
Minav, T.A. ; Dept. of Electr. Eng., Lappeenranta Univ. of Technol. (LUT), Lappeenranta, Finland ; Pyrhonen, J.J. ; Laurila, L.I.E.

The energy efficiency of an electro-hydraulic forklift is significantly improved by using a permanent-magnet-synchronous-motor-servo-drive-based direct pump control to control the position of the fork without control valves. This paper provides a short evaluation of the hydraulic system and a more detailed analysis of the losses of the electric machine drive system. A theoretical approach is taken and the results are verified by practical measurements. Finally, possible improvements of the energy efficiency in the suggested system are discussed.

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Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 6 )