Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions
Direct driven hydraulic drives (DDH) have the advantages of compact high power density in hydraulic systems and flexible control of electric motors. These advantages can benefit non-road mobile machinery (NRMM) applications. However, maintaining high efficiency while working in sub-zero conditions w...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-01-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/12/2/219 |
| _version_ | 1817990000944349184 |
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| author | Tatiana Minav Jani Heikkinen Thomas Schimmel Matti Pietola |
| author_facet | Tatiana Minav Jani Heikkinen Thomas Schimmel Matti Pietola |
| author_sort | Tatiana Minav |
| collection | DOAJ |
| description | Direct driven hydraulic drives (DDH) have the advantages of compact high power density in hydraulic systems and flexible control of electric motors. These advantages can benefit non-road mobile machinery (NRMM) applications. However, maintaining high efficiency while working in sub-zero conditions with NRMM is challenging. Therefore, this paper investigates the effect of hydraulic oil on the efficiency of a DDH in a cold environment for an NRMM application. In the DDH setup, the speed and position control of a double-acting cylinder was implemented directly with an electric motor drive in a closed-loop system without the conventional control valves. Efficiency measurements of the DDH setup with two oils (conventional multi-grade and high-performance) were conducted under different operating conditions (speed and payload) and environmental conditions (temperature in °C). The paper provides an evaluation of the electro-hydraulic system and a discussion on the usage of hydraulic oil by non-road mobile working machines in sub-zero conditions. An experimental investigation demonstrated an improvement in efficiency of 5%-unit at 22 °C, from 2%-unit to 5%-unit at 3 °C, and of almost a 10%-unit at temperatures below zero (−10 °C) by changing oil. |
| first_indexed | 2024-04-14T00:53:33Z |
| format | Article |
| id | doaj.art-6129a5271cdf4794964c21da9be76b46 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-14T00:53:33Z |
| publishDate | 2019-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-6129a5271cdf4794964c21da9be76b462022-12-22T02:21:42ZengMDPI AGEnergies1996-10732019-01-0112221910.3390/en12020219en12020219Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero ConditionsTatiana Minav0Jani Heikkinen1Thomas Schimmel2Matti Pietola3School of Engineering, Department of Mechanical Engineering, Aalto University, P.O. Box 14400, 02150 Espoo, FinlandFaculty of Industrial Automation and Electrical Engineering, Saint Petersburg Electrotechnical University ETU “LETI”, 197376 St. Petersburg, RussiaEvonik Industries AG, Kirschenallee, 64293 Darmstadt, GermanySchool of Engineering, Department of Mechanical Engineering, Aalto University, P.O. Box 14400, 02150 Espoo, FinlandDirect driven hydraulic drives (DDH) have the advantages of compact high power density in hydraulic systems and flexible control of electric motors. These advantages can benefit non-road mobile machinery (NRMM) applications. However, maintaining high efficiency while working in sub-zero conditions with NRMM is challenging. Therefore, this paper investigates the effect of hydraulic oil on the efficiency of a DDH in a cold environment for an NRMM application. In the DDH setup, the speed and position control of a double-acting cylinder was implemented directly with an electric motor drive in a closed-loop system without the conventional control valves. Efficiency measurements of the DDH setup with two oils (conventional multi-grade and high-performance) were conducted under different operating conditions (speed and payload) and environmental conditions (temperature in °C). The paper provides an evaluation of the electro-hydraulic system and a discussion on the usage of hydraulic oil by non-road mobile working machines in sub-zero conditions. An experimental investigation demonstrated an improvement in efficiency of 5%-unit at 22 °C, from 2%-unit to 5%-unit at 3 °C, and of almost a 10%-unit at temperatures below zero (−10 °C) by changing oil.http://www.mdpi.com/1996-1073/12/2/219hydraulic actuatorhydraulic driveselectric drivesefficiencylosseszonal hydraulicsdirect driven hydraulicsnon-road mobile working machineslow temperaturehigh-performance oil |
| spellingShingle | Tatiana Minav Jani Heikkinen Thomas Schimmel Matti Pietola Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions Energies hydraulic actuator hydraulic drives electric drives efficiency losses zonal hydraulics direct driven hydraulics non-road mobile working machines low temperature high-performance oil |
| title | Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions |
| title_full | Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions |
| title_fullStr | Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions |
| title_full_unstemmed | Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions |
| title_short | Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions |
| title_sort | direct driven hydraulic drive effect of oil on efficiency in sub zero conditions |
| topic | hydraulic actuator hydraulic drives electric drives efficiency losses zonal hydraulics direct driven hydraulics non-road mobile working machines low temperature high-performance oil |
| url | http://www.mdpi.com/1996-1073/12/2/219 |
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