Results 21 to 30 of about 4,058 (217)
Journal of the Textile Machinary Society, 1951 研究目的ラーヂパッケージ、ことにポツト使用の際の動力消費推定の基礎となるゥインデージロスについて、数種の回転体による実験から実験式を導き、これを図式に表示して、ラージパッケージ計画の一資料に供しようとするものである。研究結果実験の結果から、ウインデージ・ロスWwattは、回転体の外径Dm, 高さhm, 回転数Nrev/minとしてW=7.42×10-6D3.8(h+D/10)N2.8なる式で与えられるものとした。この式から計算すると、リング精紡から出発するラージパッケージではウインデージロスのために動力消費がいくぶん増す程度ですむが、大型高回転のポットではウインデージロスだけですでにその経済的価値を失つてしまうことがわかる。ウインデージロスの低下には適当なカバーを附することが有効でふつう30 ...
Sumiji Fujii +2 more
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Renewable Energy and Sustainable Development, 2023 This paper investigates the effect of rotor flux screens (conducting screens) on the performance of switched reluctance motors with a higher number of rotor poles than stator poles.
Ali A. Abdelaziz +3 more
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ISO efficiency curves of a two-phase hybrid stepping motor [PDF]
, 2010 Stepping motors are used in numerous applications because of their low manufacturing cost and simple speed control. It is well known that their energetic efficiency is low but actual values are typically not available.
Cottyn, Johannes +8 more
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Design and Optimization of a High-Speed Switched Reluctance Motor
Energies, 2021 Currently, one of the most used motor types for high-speed applications is the permanent-magnet synchronous motor. However, this type of machine has high costs and rare earth elements are needed for its production.
Stefan Kocan +4 more
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Hydraulic Analysis of a Reversible Fluid Coupling [PDF]
, 2000 This paper presents a hydraulic analysis of a fluid coupling which is designed to operate either in a forward or reverse mode when a set of turning vanes are respectively withdrawn or inserted into the flow between the driving and driven rotors.
Brennen, Christopher E. +2 more
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Power loss analysis in altered tooth-sum spur gearing
MATEC Web of Conferences, 2018 The main cause of power loss or dissipation of heat in case of meshed gears is due to friction existing between gear tooth mesh and is a major concern in low rotational speed gears, whereas in case of high operating speed the power loss taking place due ...
Sachidananda H. K. +2 more
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Research on Windage Power Loss of High-speed Arc Tooth Cylindrical Gear
Jixie chuandong, 2021 For gears running at high speeds， windage power loss is one of the main factors for low transmission efficiency. Computational fluid dynamics（CFD） technology is used to establish the air flow field model around the arc tooth cylindrical gear. The digital
Shuai Mo +5 more
doaj
Nihon Kikai Gakkai ronbunshu, 2015 Windage loss may become more than 10% of all losses when large sized gearing runs fast. In order to reduce the windage loss, it needs to vacuum a gear box because it is proportional to the density of ambient air. The study proposes a helical gearing unit
Shigeki MATSUMURA +4 more
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ENP Engineering Science Journal, 2021 This paper presents two-dimensional (2-D) thermal resistances network (TRNM), exact analytical (AM) and hybrid (HM) methods for calculating steady-state temperature and heat flux distribution in rotating electrical machines considering materials ...
Kamel Boughrara, Frédéric Dubas
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Lubricants, 2014 Efficiency improvement is one of the main challenges in all fields of design. The reduction of power losses is becoming a great concern also in the design of power transmissions.
Franco Concli +3 more
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