Calculation of the torque-RPM characteristics of power-meters

Author

Bardi, I. ; Biro, O.

Author_Institution

Dept. of Electromagn. Theory, Tech. Univ. of Budapest, Hungary

Volume

24

Issue

1

fYear

1988

fDate

1/1/1988 12:00:00 AM

Firstpage

541

Lastpage

543

Abstract

A method based on variational principles has been developed for the computation of the eddy current distribution and hence the driving and the braking torque-RPM characteristics of single-phase power meters. The air-gap field due to the voltage and current coils and the permanent magnet in the absence of the disk is presumed to be given, and the resultant air-gap field, as well as the eddy currents induced by it, are determined. Motional induction is taken into account. Global approximation is used to obtain the field quantities as expansions in terms of suitable analytical functions. A comparison is made between computed and measured torques, showing a maximum relative error of 3.1%

Keywords

eddy currents; electromagnetic induction; power measurement; torque; watthour meters; air-gap field; braking; driving; eddy current distribution; error; induction; power meters; torque-RPM characteristics; watthour meters; Air gaps; Coils; Eddy currents; Electromagnetic measurements; Energy measurement; Magnetic field measurement; Magnetic flux; Permanent magnets; Power measurement; Rotation measurement; Steady-state; Torque; Torque measurement; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.43980

Filename

43980