Title :
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
fDate :
4/1/1996 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
