Nonsinusoidal electrical measurement accuracy in adjustable-speed motors and drives

Journal Article · Sun Nov 01 04:00:00 EST 1998 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/28.738981· OSTI ID:316132

Domijan, A ^[1]; Czarkowski, D ^[2]; Johnson, J H ^[3]

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1. Univ. of Florida, Gainesville, FL (United States)
2. Polytechnic Univ., Brooklyn, NY (United States). Dept. of Electrical Engineering
3. J.H. Johnson Associates, Inc., Tipp City, OH (United States)

Accurate measurements of voltage, current, and power under nonsinusoidal conditions are essential for determining the efficiency of a drive system and performing separation of losses between an adjustable-speed drive (ASD) and an electric motor. That information is invaluable for equipment designers, manufacturers, and users. Three modern power meters and analyzers were tested to determine their accuracy with various nonsinusoidal waveforms applied. The meters were subjected to waveforms that are characteristic to the three most common fractional and integral horsepower ASD technologies, namely, pulsewidth modulation induction, brushless dc, and switched-reluctance drives. The tests were performed under field conditions and in a computer-controlled laboratory environment. The obtained results show that some meters are able to measure accurately electric power at the input to ASD`s. However, the output power of ASD`s for brushless dc and switched-reluctance technology was not measured with acceptable accuracy by any of the tested meters. Possible reasons of meters inaccuracies and suggestions for performance improvement are presented. Conclusions on the present state of ASD electric power measurements and recommendations for further research are given.

• OSTI ID: 316132
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 6 Vol. 34; ISSN 0093-9994; ISSN ITIACR
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ELECTRIC CURRENTS
ELECTRIC MOTORS
ELECTRIC POTENTIAL
ELECTRIC POWER
MEASURING METHODS