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This paper investigates the effect of an induction machine (IM) drive on the efficiency of an electric energy recovery system of a hydraulic forklift. The control of the hydraulic system is implemented directly with a motor drive without control valves. The paper provides accurate evaluation of the hydraulic system and a detailed analysis of electric part of the working machine. A theoretical analysis...
The solid rotor end effects have been discussed widely in the literature decades ago. The end effect calculation has become important again, as large purely solid-rotor machines (8 MW at 12000 rpm) have been designed for gas compression applications. The paper introduces new ideas for applying a two-dimensional finite-element-method-based analysis and traditional analytic calculation techniques particularly...
Usually skin effect is neglected in the design of medium speed machines when using random wound windings. That is because it is thought that parallel strands mix enough so that the skin effect can be neglected. In medium speed machines operating in the frequency range of 100 - 300 Hz the skin effect problem may come up in cases where the slots have only one or a couple of turns despite the fact that...
The purpose of this research is to find possibilities to recover electric energy in a hydraulic forklift system. The drive consists of a DTC controlled electric servo motor directly running a reversible hydraulic pump. A real system was built and tested, especially, from the energy recovery point of view. Results of the system were analyzed and compared and according to them, energy can be recovered...
The paper provides a short overview of the main principles of teaching the history of electrical engineering at LETI and at LUT. At both universities the teaching of the history of electrical engineering has been actively promoted. Recently, the cooperation and exchange of experience in the field of lecturing "History of electrical engineering" has been developed. The history of electrical...
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