Electric Motor Parameter Measurement Using Torque Ramp Curve Fitting
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Solution Overview
Problem
Establishing mechanical system parameters of electric motor systems, such as moment of inertia and friction effects, is typically done manually, leading to potential human errors and operational complexities.
Innovation Solution
A method involving a linear ramp of electrical torque applied to the motor system, measuring velocity responses, and using curve fitting algorithms to determine mechanical system parameters without prior assumptions, allowing for autonomous or automatic parameter establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual parameter establishment is used, then human operation flexibility is maintained, but human errors and operational complexities increase
Solution Approach 1:
The system performs self-measurement of mechanical parameters by automatically applying torque ramps, measuring velocity responses, and calculating parameters through curve fitting algorithms, eliminating the need for manual operator intervention and thereby reducing human errors while maintaining operational simplicity
Solution Approach 2:
The patent replaces manual mechanical measurement methods with an automated electrical measurement system that uses torque ramps and velocity sensing, substituting human-operated mechanical procedures with an automated electromechanical system that improves reliability without increasing operational complexity
2Measurement precision
If automated parameter measurement is implemented, then measurement precision and efficiency are improved, but system complexity increases
Solution Approach 1:
The frequency converter is designed to perform multiple functions: it serves as both the drive controller and the measurement instrument by generating torque ramps, measuring velocity responses, executing curve fitting algorithms, and calculating mechanical parameters, thereby improving measurement precision without requiring separate dedicated measurement equipment that would increase system complexity
Solution Approach 2:
The patent merges the measurement functions into the existing frequency converter control system, combining torque generation, velocity measurement, data processing, and parameter calculation into a single integrated system, which achieves high measurement precision while avoiding the complexity increase that would result from adding separate measurement devices
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables precise and efficient measurement of mechanical characteristics like moment of inertia and friction effects with high accuracy, reducing human error and improving the operation of electric motor systems, thereby enhancing energy efficiency and digitalization in various technical fields.
Implementation Method 1
The electric torque of an electric motor is proportional to the applied current
Implementation Method 2
measuring data representative of the velocity response of the system
Data Source
AI summary
A method for measuring mechanical system parameters, in particular the moment of inertia and friction effects, describing an electric motor system, includes the steps of applying a linear ramp of electrical torque corresponding to a current slope h to the system; measuring data representative of the velocity response of the system; fitting the measured data with a model function by applying a curve fitting algorithm, wherein a number of fitting parameters coincides with the mechanical system parameters of the system. An electric motor system is further disclosed having an electric motor and a frequency converter or drive, wherein the electric motor system is provided for carrying out a corresponding method.