These situations have motivated the development of alternative methods for parameter values determination, ranging from analytical calculations based on nameplate data to frequency response analysis. Finally, the knowledge of the circuit parameter values may be desired prior to acquisition for simulation of even didactic purposes. Second, the necessary interruption in the operation of the motor is undesired in critical industrial processes. First, the necessary instrumentation is not often available where the motor is operating, thus demanding the transference of the machine to a testing site or laboratory. Although such procedures provide reliable results, their requisites may be impractical in some places or situations. 1 - 87.], such as no load and locked rotor tests. The circuit parameter values are traditionally determined through tests described on IEEE Standard 112 IEEE Standard 112, “IEEE standard procedure for polyphase induction motors and generators,” IEEE Nov. Three-phase induction motors (TIM) operating under steady-state regime are commonly modeled using a per phase equivalent circuit, which enables the calculation of quantities such as line current, power factor, input and output power and efficiency simply as a function of supply voltage, frequency and slip.
The combination of methods has improved the accuracy of calculations for the studied motors.Įquivalent circuit Parameter value estimation Manufacturer data Three-phase induction motor The assessment is based on the closeness of the resulting parameter values to reference values and on the inexistence of absurd results, such as negative electrical resistances. Six analytical methodologies used in the context of efficiency estimation at steady-state operation are assessed, compared and then combined in order to improve results. Special focus is given to methods which employ only data usually provided by manufacturers on catalogs and nameplates. This paper presents initially a survey on the determination of circuit parameters from alternative methods, i.e., non-standard tests. However, the determination of the circuit parameters through standard methods, such as those described in IEEE Standard 112, may not be possible in many situations given the lack of the necessary resources.
Depending on the desired application, the circuit may or may not represent core losses, a double cage or even the variation of parameters due to skin effect and saturation. The single phase equivalent circuit is largely used to model the three-phase induction motors in steady-state operation and under sinusoidal balanced voltages.