The evolution of elemental motor technology for eliica

Takahisa Yashiro, Osamu Shimizu, Tadashi Takano, Manabu Omae, Hiroshi Shimizu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Motors used in electric vehicles have a very unique and harsh running condition and environment-High efficiency is especially demanded in these two conditions; the acceleration needed upon start, and upon riding the expressway, which is about lOOkm/h to 120km/h in Japan. In order to increase the efficiency in these two conditions, shape and volume of the motor should be well thought out because of the limited space. The conditions are different with every vehicle but there is a need to find the best ratio of the diameter and stack length. In-wheel motors have the best transmission efficiency while having many other advantages because every wheel is independent. However, in-wheel motors are very much restricted in terms of shape and volume. Interior permanent magnet (TPM) outer rotor motors with different diameter and shaft length and numbers of slots and poles were simulated to sec the characteristics torque and efficiency of the motor. By optimizing the size and shape and also the electromagnet structure of an outer rotor motor, the driving range for electric vehicles increases. By increasing the diameter, maximum torque increased at a parabolic curve while by increasing the stack length the maximum torque linearly increased. By this, the maximum torque of the motor is approximately decided by the volume, diameter squared multiplied by the stack length. However, while a thin motor has a short torque constant area of the NT curve while, a thick motor has a long torque constant area. This results in a change in efficiency at different driving pattern.

Original languageEnglish
Title of host publicationElectric Drive Transportation Association - 23rd Int. Electric Vehicle Symposium and Exposition 2007, EVS 2007 (Battery, Hybrid, Fuel Cell) Conf. Proc. - Sustainability
Subtitle of host publicationThe Future of Transportation
Pages724-735
Number of pages12
Publication statusPublished - 2007 Dec 1
Event23rd International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exposition 2007 - Sustainability: The Future of Transportation, EVS 2007 - Anaheim, CA, United States
Duration: 2007 Dec 22007 Dec 5

Publication series

NameElectric Drive Transportation Association - 23rd Int. Electric Vehicle Symposium and Exposition 2007, EVS 2007 (Battery, Hybrid, Fuel Cell) Conf. Proc. - Sustainability: The Future of Transportation
Volume2

Other

Other23rd International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium and Exposition 2007 - Sustainability: The Future of Transportation, EVS 2007
CountryUnited States
CityAnaheim, CA
Period07/12/207/12/5

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Keywords

  • 1pm
  • Direct drive
  • In-wheel motor
  • Outer rotor
  • Rliica

ASJC Scopus subject areas

  • Fuel Technology

Cite this

Yashiro, T., Shimizu, O., Takano, T., Omae, M., & Shimizu, H. (2007). The evolution of elemental motor technology for eliica. In Electric Drive Transportation Association - 23rd Int. Electric Vehicle Symposium and Exposition 2007, EVS 2007 (Battery, Hybrid, Fuel Cell) Conf. Proc. - Sustainability: The Future of Transportation (pp. 724-735). (Electric Drive Transportation Association - 23rd Int. Electric Vehicle Symposium and Exposition 2007, EVS 2007 (Battery, Hybrid, Fuel Cell) Conf. Proc. - Sustainability: The Future of Transportation; Vol. 2).