Simplified algorithm for assessment equivalent circuit parameters of induction motors

Abstract

Induction or asynchronous AC motors are widely used in the electromechanical industries. However, the selection of an appropriate motor for specific drive applications represents a non-trivial task. The most effective and universally accepted method is to use equivalent T-circuit for this purpose. Parameter determination of equivalent circuit should be done relatively fast and accurately. This article describes a novel and simplified method for the estimation of equivalent circuit parameters, which is exclusively based on the manufacturer's datasheet. The proposed method is based on the synergetic interaction between the numerical and analytical dimensionless approach using the Thevenin theorem. Initially, rated motor parameters and unknown variables of the equivalent circuit are combined into dimensionless expressions using the Thevenin approach. This method is simple, original, and useful to prevent instability in the numerical solution. Importantly, the high convergence of a solution and relatively fast calculation of parameters reveals the significant novelty of the proposed method. This method provides accurate and sustainable results for a wide range of low voltage asynchronous motors with different rotational velocities, torque, and power range from a few to hundreds of kilowatts. The proposed method is validated by the application of three types of asynchronous AC motors.

Extended Kalman filter based estimations for improving speed‐sensored control performance of induction motors

“…In an efficiently designed and manufactured IMs, the stator leakage inductance () and rotor leakage inductance referred to the stator side () are always small in terms of ; total leakage inductance () and thus and can be easily determined by the IEEE Standard 112‐1996 Test Procedure for Polyphase Induction Motors and Generators [28] or the other methods as in [29–31]. The load‐dependent variations about 20% [32] in , or are usually ignored in the estimation and control performances since they are less important on the performances than and [31].…”

An effective method for determination and characteristic analysis of induction motor parameters

“…Pedra J. and Sainz L. discussed in detail the shortcomings of four methods mentioned in [3] and proposed a set of methods combining non-load test, locked-rotor test and overload test [4], but ignored the effect of iron loss [5]. The nameplate data given by the manufacturer or empirical values provided by the National Electrical Manufacturers Association (NEMA) are used to estimate ECPs [6][7][8][9][10], but these values are difficult to guarantee parameter accuracies of the IM used. Based on the inverse-Γ equivalent circuit at standstill [11], Peretti L. and Zigliotto M. proposed to obtain parameter values with different test signals in the sequence, that is, the stator resistance is estimated by imposing DC current, the transient inductance is estimated by injecting a high-frequency sinusoidal test signal and the rotor resistance is obtained by the exciting system with a sinusoidal low-frequency and low-amplitude voltage.…”

Influence of Equivalent Circuit Resistances on Operating Parameters on Three-Phase Induction Motors with Powers up to 50 kW

“…The calculation procedure is based on the use of the equivalent circuit [4][5][6]. The resistors evaluate the different types of losses appear: Joule losses on the stator and the rotor, and the iron losses [7,8]: the stator resistance depending on the diameter of the conductor being used, the rotor resistance depends on the variation of the section of the rotor cage, as well as the iron losses resistance and how it is affected by the type of ferromagnetic steel selected and its specific iron losses.…”