Electric machines: a new formulation for the power-mass-efficiency-speed relationship

Author

Van Niekerk, Hendrik R. ; Van Wyk, Jacobus D.

Author_Institution

Pretoria Univ., South Africa

fYear

1992

fDate

4-9 Oct 1992

Firstpage

86

Abstract

A novel approach to the classical analysis of the performance of electrical machines is presented. Analysis of an elementary machine model comprising a conductor moving in a magnetic field results in fundamental equations uniquely relating the power-to-mass and torque-to-mass ratios of the elementary machine to operating speed, flux density, efficiency, and the conductor material constants. Allowance is made for nonactive (overhang) conductor material and the remainder of the structural mass of a machine. The approach is applicable to conventional and permanent magnet DC machines, squirrel cage and wound rotor AC machines, and wound rotor and permanent-magnet double cylindrical synchronous machines. Comparison of theoretical and actual specific power values of a few different AC and Dc machines showed very close agreement. The new formulae allow the absolute limits of performance of these machines to be calculated easily

Keywords

AC machines; DC machines; electromagnetic fields; machine theory; rotors; conductor material; electrical machines; elementary machine model; machine theory; magnetic field; performance; permanent magnet DC machines; power-mass-efficiency-speed relationship; squirrel cage motors; synchronous machines; wound rotor; Conducting materials; DC machines; Electric machines; Equations; Magnetic analysis; Magnetic fields; Magnetic materials; Performance analysis; Permanent magnets; Wounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1992., Conference Record of the 1992 IEEE

Conference_Location

Houston, TX

Print_ISBN

0-7803-0635-X

Type

conf

DOI

10.1109/IAS.1992.244460

Filename

244460