Variable characteristic permanent magnet motor for automobile application

Takashi Kato, Takashi Fukushige, Kan Akatsu, Robert Lorenz

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

9 Citations (Scopus)

Abstract

This paper describes a variable magnetomotive force interior permanent magnet (IPM) machine for use as a traction motor on automobiles in order to reduce total energy consumption during duty cycles and cut costs by using Dy-free magnets. First, the principle of a variable magnetomotive force flux-intensifying IPM (VFI-IPM) machine is explained. A theoretical operating point analysis of the magnets using a simplified model with nonlinear B-H characteristics is presented and the results are confirmed by nonlinear finite element analysis. Four types of magnet layouts were investigated for the magnetic circuit design. It was found that a radial magnetization direction with a single magnet is suitable for the VFI-IPM machine. Magnetization controllability was investigated with respect to the magnet thickness, width and coercive force for the prototype design. The estimated variable motor speed and torque characteristics are presented. Following the explanation of the design process, the experimental results obtained for the prototype machine are described. The torque characteristic and the transient torque behavior during magnetization state (MS) control were confirmed experimentally. Based on the experimental results, the total loss in a typical duty cycle was calculated. Since too frequent manipulation of the magnetization state results in larger loss due to the loss caused by the MS control current, hysteresis control was implemented to reduce the number of MS changes. Using the proposed control algorithm, the total energy consumption was calculated in comparison with that of a conventional motor. It was found that the VFI-IPM motor reduces the total energy consumption significantly.

Original languageEnglish
Title of host publicationSAE Technical Papers
PublisherSAE International
Volume1
DOIs
Publication statusPublished - 2014
EventSAE 2014 World Congress and Exhibition - Detroit, MI
Duration: 2014 Apr 82014 Apr 10

Other

OtherSAE 2014 World Congress and Exhibition
CityDetroit, MI
Period14/4/814/4/10

Fingerprint

Permanent magnets
Automobiles
Magnetization
Magnets
Energy utilization
Torque
Fluxes
Traction motors
Magnetic circuits
Electric current control
Coercive force
Controllability
Hysteresis
Finite element method
Costs

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering
  • Automotive Engineering

Cite this

Kato, T., Fukushige, T., Akatsu, K., & Lorenz, R. (2014). Variable characteristic permanent magnet motor for automobile application. In SAE Technical Papers (Vol. 1). SAE International. https://doi.org/10.4271/2014-01-1869

Variable characteristic permanent magnet motor for automobile application. / Kato, Takashi; Fukushige, Takashi; Akatsu, Kan; Lorenz, Robert.

SAE Technical Papers. Vol. 1 SAE International, 2014.

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

Kato, T, Fukushige, T, Akatsu, K & Lorenz, R 2014, Variable characteristic permanent magnet motor for automobile application. in SAE Technical Papers. vol. 1, SAE International, SAE 2014 World Congress and Exhibition, Detroit, MI, 14/4/8. https://doi.org/10.4271/2014-01-1869
Kato T, Fukushige T, Akatsu K, Lorenz R. Variable characteristic permanent magnet motor for automobile application. In SAE Technical Papers. Vol. 1. SAE International. 2014 https://doi.org/10.4271/2014-01-1869
Kato, Takashi ; Fukushige, Takashi ; Akatsu, Kan ; Lorenz, Robert. / Variable characteristic permanent magnet motor for automobile application. SAE Technical Papers. Vol. 1 SAE International, 2014.
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