Measured efficiency improvements of induction motors with thyristor/triac controllers

Author

Fuchs, Ewald F. ; Hanna, William J.

Author_Institution

Dept. of Electr. Eng., Univ. of Colorado, Boulder, CO, USA

Volume

17

Issue

4

fYear

2002

fDate

12/1/2002 12:00:00 AM

Firstpage

437

Lastpage

444

Abstract

The deployment of inexpensive thyristor/triac controllers improves the efficiency and does not increase the power factor of induction motors (as measured at the input of pole transformer) operating under variable torque and constant speed constraints. Computer-aided testing yields detailed input/output powers for the drive. The improvement of the power factor does not increase the real-power capability (RPC) of a transformer supplying power to such drives due to current harmonics. Although the total harmonic current distortion (THD_i) may exceed IEEE 519 and IEC 555 recommendations, publications show that the impact on the apparent power derating of a 25 kVA pole transformer is small if THD_i<50%.

Keywords

IEC standards; harmonic distortion; induction motor drives; power factor; power measurement; power transformers; thyristor circuits; 25 kVA; IEC 555; IEEE 519; THD; apparent power derating; computer-aided testing; constant speed; current harmonics; drive power measurement; efficiency improvements; energy savings; induction motors; input/output powers; pole transformer; power factor; thyristor/triac controllers; total harmonic current distortion; variable torque; Induction motors; Power generation; Power measurement; Power system harmonics; Reactive power; Testing; Thyristors; Torque control; Torque measurement; Velocity measurement;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/TEC.2002.805180

Filename

1159193