Measuring equipment for the electric quantities at the terminals of an inverter-fed induction motor

Author

Cristaldi, Loredana ; Ferrero, Alessandro ; Ottoboni, Roberto

Author_Institution

Dept. of Electr. Eng., Politecnico di Milano, Italy

Volume

45

Issue

2

fYear

1996

fDate

4/1/1996 12:00:00 AM

Firstpage

449

Lastpage

452

Abstract

The electric quantities at the terminals of an inverter-fed induction motor are difficult to measure because of the large distortion on both the voltage and current signals. Special care must be taken in evaluating the rms values and power. A measuring device is proposed for the measurement of voltage and current rms values, their frequency, their frequency-domain components and the active power consumed by the motor. The measuring instrument is based on digital signal-processing techniques and is organized as a Virtual Instrument. The results of some experimental work done on a 3 kW induction motor supplied by a six-step inverter are reported

Keywords

analogue-digital conversion; current transformers; data acquisition; digital instrumentation; digital phase locked loops; electric current measurement; frequency measurement; frequency multipliers; induction motor drives; invertors; potential transformers; power measurement; signal sampling; virtual machines; voltage measurement; 3 kW; ADC boards; active power; current rms values; current transducer; data acquisition system; digital PLL; digital signal-processing; electric quantities measuring equipment; frequency measurement; frequency-domain components; inverter-fed induction motor terminals; large distortion; sampling theorem; six-step inverter; synchronous sampling clock generator; virtual instrument; voltage rms values; voltage transducer; Bandwidth; Current measurement; Distortion measurement; Electric variables measurement; Frequency measurement; Induction motors; Power measurement; Sampling methods; Traction motors; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.492765

Filename

492765