Identifying Three Phase Induction Motor Equivalent Circuit Parameters from Nameplate Data by Different Analytical Methods

Abstract

The induction motor equivalent circuit parameters are required for many performance and planning studies involving induction motors. These parameters are typically calculated from standardized motor performance tests, such as the no load, full load, and locked rotor tests. However, standardized test data is not typically available to the end user. Alternatively, the equivalent circuit parameters may be estimated based on published performance data for the motor. Methodologies for obtaining the parameters of the equivalent circuit for an induction motor from the information on the nameplate and an analysis is presented so that the typical parameters of an equivalent circuit can be readily estimated.

Simplified algorithm for assessment equivalent circuit parameters of induction motors

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“…In scientific literature, various methods and different software have been described to determine AC motor parameters [1–39]. However, a universal solution to this problem is not achieved yet.…”

“…The second group of methods is based on a rigorous analytical approach involving a composing and solution of the system of algebraic equations. Wherein nominals of elements in the equivalent circuit represent unknown variables and rated motor parameters represent the coefficients in these equations [4–12]. The rigorous non‐linearity is the main hurdle to solve such equations, which causes mathematical difficulties to overcome instability and inaccuracy of results.…”

“…The rigorous non‐linearity is the main hurdle to solve such equations, which causes mathematical difficulties to overcome instability and inaccuracy of results. Detailed investigation of analytical methods based on motor's template represented in [4, 5] where these math obstacles to obtaining accurate and stable results were emphasised. Owing to this circumstance, different approaches were proposed to improve the situation.…”