Tatiana A. Minav

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

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.

Electric energy recovery system efficiency in a hydraulic forklift

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 efficiently from the hydraulic forklift system. Also new ideas and directions of further research were obtained during the research.

A New Passive Hybrid Air-Core Foil Filter for Modern Power Drives

This paper introduces an alternative implementation of the traditional LC filter, called hybrid LC filter (HLCF). The construction described in this paper contains two foil windings that integrate inductance and capacitance into one unit. The main aspects of the HLCF design are considered. The experimental data show that the device proposed here can be used, instead of traditional LC filters, as an alternative solution for the mitigation of the adverse effects of the pulse-width modulation (PWM).

Energy recovery efficiency comparison in an electro-hydraulic forklift and in a diesel hybrid heavy forwarder

Electro-hydraulic systems of heavy machines operating at different potential energy levels, using e.g. a lifting boom are evaluated. Practical results are found by using a light electro hydraulic forklift in measurements. A heavier diesel hydraulic forwarder is studied theoretically using the experimental results of the forklift as base data. An analysis of the efficiency of the energy recovery from a lifting boom of a forwarder is done.

Effect of PMSM sizing on the energy efficiency of an electro-hydraulic forklift

This paper investigates the effect of a permanent magnet synchronous machine (PMSM) drive on the efficiency of an electric energy recovery system of a hydraulic forklift. The control of the system is implemented directly with a permanent magnet AC servo motor drive without control valves. The paper provides accurate evaluation of the hydraulic system and the electric part of the working machine. An analysis of the theoretical model is made and the model is verified by practical results. Finally, possible improvements of the efficiency in the suggested system are estimated.

Effect of an Electric Motor on the Energy Efficiency of an Electro-Hydraulic Forklift

Mobile working machines can be classified as light mobile machines that operate by battery power and heavy machines that work using a diesel engine. Both of these types include mechanical structures, which are driven by hydraulics. With the rising concern in global scale environmental issues, energy saving in vehicles and mobile machines is an important subject and reduction of fuel consumption is strongly required (Petrone, 2010 ; Saber, 2010 ; Bhattacharya, 2009 ; Montazeri-Gh, 2010 ; Mapelli, 2010, Liu, 2010). Hybrid propulsion concepts in working machines are emerging to improve their fuel economy and reduce CO2 emissions (Fakham, 2011; Hui, 2010, Paulides, 2008). In addition, now there are government mandated Tier IV reduction regulations for harmful exhaust gases for diesel powered

Induction machine drive in energy efficient industrial forklift

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 is made and the model is verified by practical results. Finally, possible improvements of the efficiency in the suggested system are considered.

Oil flow control system based on gradient heat flux sensors for industrial application as industrial forklift

Paper researches application of the gradient heat flux sensor (GHFS) as oil flow control unit for industrial application. The results as presented here show that the usage of GHFSs for fluid flow indication in comparison with the available temperature devices is quite competitive.