Variable Inductance Coil Model for Circuit Simulator
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Solution Overview
Problem
Conventional circuit simulators for electric motors and generators struggle with accurately modeling variable inductance and nonlinear electrical characteristics, leading to inaccuracies in simulation results and limited applicability, especially when handling coils with changing inductance values and complex configurations like Y- or delta configurations.
Innovation Solution
An equivalent circuit model for a coil is introduced, incorporating a current source, voltage extractor, current generator, and resistance elements, allowing for variable inductance and nonlinear characteristic handling, along with a current-carrying path for regenerative currents, which enables accurate simulation of electric motors and generators by stabilizing the system and separating current sources during non-current carrying states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional circuit simulators use constant electrical characteristics based on lumped constants, then the device complexity is low and ease of operation is high, but the measurement precision and reliability of simulation results deteriorate because the values cannot change with each instant as in actual electric motors
Solution Approach 1:
The patent applies dynamics by transforming the static lumped constant model into a dynamic equivalent circuit where electrical characteristics (inductance, resistance) vary with instantaneous operating conditions. The equivalent circuit includes time-varying parameters that adapt to changing motor states, enabling accurate representation of real-world behavior while maintaining circuit simulator compatibility.
Solution Approach 2:
The patent implements parameter changes by allowing electrical characteristics in the equivalent circuit to vary dynamically based on operating conditions. Instead of fixed lumped constants, the circuit uses variable parameters that change with instantaneous current, voltage, and magnetic flux conditions, thereby improving measurement precision without requiring complete redesign of the simulation architecture.
2Productivity
If conventional circuit simulators use constant electrical characteristics, then the ease of operation is high and setup is simple, but the productivity is reduced due to separation between calculation results and actual measured values requiring manual verification
Solution Approach 1:
The patent applies self-service by enabling the equivalent circuit to automatically adapt its electrical characteristics based on instantaneous operating conditions without requiring manual intervention. The circuit self-adjusts parameters to match actual motor behavior, eliminating the need for operators to manually verify results against measured values and thereby improving productivity while maintaining ease of use.
3Measurement precision
If the equivalent circuit uses variable inductance to match actual coil characteristics, then the measurement precision improves, but the device complexity increases due to the need for current sources, voltage extractors, and current generators
Solution Approach 1:
The patent applies segmentation by dividing the equivalent circuit into distinct functional modules: current sources for generating excitation currents, voltage extractors for obtaining terminal voltages, and current generators for calculating coil currents based on inductance values. This modular segmentation allows each component to handle a specific function, improving measurement precision while organizing complexity into manageable, reusable units.
4Reliability
If the circuit simulator handles nonlinear electrical characteristics of coils, then the reliability of simulation results improves, but the device complexity increases due to the need for iterative calculations and specialized algorithms
Solution Approach 1:
The patent uses an intermediary approach by introducing an equivalent circuit as a mediator between the nonlinear physical characteristics of actual coils and the linear calculation framework of conventional circuit simulators. The equivalent circuit translates nonlinear magnetic circuit behavior into equivalent electrical parameters that can be processed by standard circuit simulation algorithms, thereby improving reliability without requiring complex iterative calculation systems.
Data Source
AI summary
An equivalent circuit for a coil incorporated in a circuit simulator is a model of an equivalent circuit for a coil included in a circuit simulator for analysis of an electrical device including a coil forming a magnetic circuit. The equivalent circuit of a coil included in an electric motor or other electrical device is preferably comprised of a resistance component (R), induced voltage component (−dΦ/dt), and inductance component (L). The equivalent circuit of the inductance component is provided with a current source, a voltage extractor for extracting the voltage across the terminals of this current source, a current generator for determining the value of the current of the current source based on the value of the voltage output by this voltage extractor, and a current-carrying path connected in parallel to the current source and carrying a regenerative current at the time of off operation. By the above configuration, an electrical device including a coil can be analyzed and the iterative calculation at the time of handling nonlinear characteristic data becomes unnecessary. An actual model can be realized with variable values of the inductance element.