Möbius Transformations and the Analytic--Geometric Reconstruction of the Induction--Machine Circle Diagram

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1. Verfasser: Gupta, Anubhav
Format: Preprint
Veröffentlicht: 2025
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author Gupta, Anubhav
author_facet Gupta, Anubhav
contents The Heyland circle diagram is a classical graphical method for representing the steady--state behavior of induction machines using no--load and blocked--rotor test data. Despite its long pedagogical history, the traditional geometric construction has not been formalized within a closed analytic framework. This note develops a complete Euclidean reconstruction of the diagram using only the two measured phasors and elementary geometric operations, yielding a unique circle, a torque chord, a slip scale, and a maximum--torque point. We prove that this constructed circle coincides precisely with the analytic steady--state current locus obtained from the per--phase equivalent circuit. A Möbius transformation interpretation reveals the complex--analytic origin of the diagram's circularity and offers a compact explanation of its geometric structure.
format Preprint
id arxiv_https___arxiv_org_abs_2512_08302
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Möbius Transformations and the Analytic--Geometric Reconstruction of the Induction--Machine Circle Diagram
Gupta, Anubhav
Dynamical Systems
Systems and Control
Complex Variables
The Heyland circle diagram is a classical graphical method for representing the steady--state behavior of induction machines using no--load and blocked--rotor test data. Despite its long pedagogical history, the traditional geometric construction has not been formalized within a closed analytic framework. This note develops a complete Euclidean reconstruction of the diagram using only the two measured phasors and elementary geometric operations, yielding a unique circle, a torque chord, a slip scale, and a maximum--torque point. We prove that this constructed circle coincides precisely with the analytic steady--state current locus obtained from the per--phase equivalent circuit. A Möbius transformation interpretation reveals the complex--analytic origin of the diagram's circularity and offers a compact explanation of its geometric structure.
title Möbius Transformations and the Analytic--Geometric Reconstruction of the Induction--Machine Circle Diagram
topic Dynamical Systems
Systems and Control
Complex Variables
url https://arxiv.org/abs/2512.08302