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Searching for Optimal Solutions for Motor Performance Design

Honda R&D Co.,Ltd.-Yuko Miyabe, Masahito Kakema, Toshihiro Saito
  • Technical Paper
  • 2020-01-0460
To be published on 2020-04-14 by SAE International in United States
This paper relates a method for seeking Pareto solutions for strength, torque-rotational speed characteristics, losses, and exciting force in the preliminary design of interior permanent magnet synchronous motors (IPMSM) and carrying out optimal design in an integrated manner. As to the constraint on strength, it was determined that the von Mises stress on the rotor core with respect to the load of the centrifugal force at 1.2 times the maximum rotational speed should not exceed the breaking strength of common electrical steel sheet material. As to the torque-rotational speed characteristic, this was determined to be the maximum torque for each rotational speed, taking into account the maximum voltage and current input when maximum torque per ampere control and field weakening control are applied. The maximum torque at low rotational speed and the maximum power at maximum rotational speed were taken as evaluation parameters. Losses were defined as the total value of DC copper loss occurring in the coil and iron loss occurring in the stator and rotor core. As to the exciting force, the 6th…
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Elucidation of the Sulfide Corrosion Mechanism in Piston Pin Bushings

Honda R&D Co., Ltd.-Ryuta Motani, Kazuki Maeyama, Kenta Yoshii, Shinji Oshida, Hiroki Masuda, Tomohiro Ikeda, Tatsuya Okayama, Shinichi Takahashi
  • Technical Paper
  • 2020-01-1079
To be published on 2020-04-14 by SAE International in United States
Recent trends to downsize engines have resulted in lighter weight and greater compactness. At the same time, however, power density has increased due to the addition of turbocharger and other such means to supplement engine power and torque, and this has increased the thermal and mechanical load. In this kind of environment, corrosion of the copper alloy bushing (piston pin bushing) that is press-fitted in the small end of the connecting rod becomes an issue. The material used in automobile bearings, of which the bushing is a typical example, is known to undergo sulfidation corrosion through reaction with an extreme-pressure additive Zinc Dialkyldithiophosphate (ZnDTP) in the lubricating oil. However, that reaction path has not been clarified. The purpose of the present research, therefore, is to clarify the reaction path of ZnDTP and copper in an actual engine environment. In order to ascertain the effects of the heat, copper content, and state of deterioration of the oil on corrosion, component corrosion tests were conducted. The results of the component corrosion tests suggested that the main factor…
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Investigation on Tribological Performance of Nano Zno and Mixed Oxide of Cu – Zn as Additives in Engine Oil.

Hindustan Institute of Technology & Science-Bharadwaj Ramakrishnan, Sangeethkumar Elumalai, Jaikumar Mayakrishnan, Induja Saravanan, S Jenoris Muthiya
  • Technical Paper
  • 2020-01-1095
To be published on 2020-04-14 by SAE International in United States
Lubrication plays an essential role in wear reduction of various mechanisms, eliminating surface to surface contact of components. In the automotive field the lubricants, in the form of oils or greases, are presented in motors, gearboxes, distributors, differentials, pumps, bearings etc. The quality and the condition of lubricants influence the performance through the properties as high pressure resistance, viscosity and viscosity index, anti-wear and anti-corrosion resistance etc. The Proper lubrication augments the efficiency and the reliability of engines and protects against corrosion and wear. In an internal combustion engine, almost 33% of the energy produced by the fuel during combustion was wasted due to very high friction between the moving parts in the engine because the engine oil could not play a effective role during in different operating condition. Nanoparticles used as additives in the engine oil can exhibit good friction reduction and anti-wear behavior. The present study aims to enhance the tribological performance of engine oil SAE(20W-40) by employing nano zinc oxide and mixed oxides of copper and zinc as additives. The zinc oxide…
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TERMINALS, LUG AND SPLICES, CONDUCTOR, CRIMP STYLE, COPPER TERMINAL, LUG, INSULATED, TIN WHISKER RESISTANT, RING TONGUE, BELL-MOUTHED, TYPE II, CLASS 1 (FOR 150 °C TOTAL CONDUCTOR TEMPERATURE)

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS7928/13C
  • Current
Published 2020-03-24 by SAE International in United States

SCOPE IS UNAVAILABLE.

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Steel, Sheet, Strip, and Plate 0.95Cr - 0.20Mo - (0.30 - 0.35C) (4132)

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS6356J
  • Current
Published 2020-03-18 by SAE International in United States
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
This content contains downloadable datasets
Annotation ability available
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Copper Strengthens 3D-Printed Titanium

  • Magazine Article
  • TBMG-36190
Published 2020-03-01 by Tech Briefs Media Group in United States

Titanium alloys used in additive manufacturing often cool and bond together in column-shaped crystals during the 3D printing process, making them prone to cracking or distortion. And unlike aluminum or other commonly used metals, there is no commercial grain refiner for titanium that manufacturers can use to effectively refine the microstructure to avoid these issues.

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Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 74Ni - 7.0Cr - 16.5Mo Solution Heat Treated

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5771G
  • Current
Published 2020-02-25 by SAE International in United States
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, flash welded rings, and stock for forging or flash welded rings.
This content contains downloadable datasets
Annotation ability available
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Steel Sheet, Strip, and Plate 0.80Cr - 1.8Ni - 0.25Mo (0.49 - 0.55C) Annealed

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS6396G
  • Current
Published 2020-02-18 by SAE International in United States
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
This content contains downloadable datasets
Annotation ability available
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Weyl Semimetals (WSM) for Electronics Applications

Aerospace & Defense Technology: February 2020

  • Magazine Article
  • 20AERP02_11
Published 2020-02-01 by SAE International in United States

New synthesized materials open the way to govern the density of helicity, axial charge, and its flow, axial current.

The major factor determining transport properties of solids is the number of electron states in a vicinity of Fermi level. In equilibrium, no macroscopic flow of electrons exists and, therefore, in order to create such flow, electrons must be excited over their equilibrium distribution. However, electrons with energies well below the Fermi level (compared to the characteristic energy scale kBT, where kB is the Boltzmann constant and T is the temperature), cannot acquire small excitation energy. Indeed, in this case, they would have energy corresponding to already occupied states, which is prohibited by the Pauli principle. In turn, well above the Fermi level, where excitation of electrons is not constrained by the Pauli principle, the electron states are not populated, thus making their contribution to the response negligible.

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DC Resistivity vs RF Impedance of EMI Gaskets

AE-4 Electromagnetic Compatibility (EMC) Committee
  • Aerospace Standard
  • AIR1404
  • Current
Published 2020-01-30 by SAE International in United States
This AIR discusses the DC resistivity property of EMI gaskets.
Annotation ability available