Brushless Motor Position Ascertainment via Back-EMF
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Solution Overview
Problem
Existing systems for position ascertainment in movable components, such as lift cabin doors, are inefficient during power failures, requiring time-consuming initialization movements and additional sensors, leading to delayed system readiness.
Innovation Solution
A magnetic flow-regulated brushless permanent magnet motor is used as a generator to generate electrical energy through magnetic attraction and repelling reactions, eliminating the need for additional sensors and enabling precise position ascertainment without mechanical wear, by utilizing the motor's inherent magnetic fields to accelerate the rotor and increase electrical energy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are used for position ascertainment, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the position ascertainment function with the existing motor system by utilizing the motor's back-EMF signal. The evaluation unit processes the voltage signal generated by the motor's rotor movement to determine position, merging two functions (motoring and sensing) into a single integrated system, thereby eliminating additional sensors while maintaining measurement precision.
Solution Approach 2:
The motor serves multiple functions: it acts as both the actuator for moving the component and as a sensor for position detection. The back-EMF signal generated during motor operation is evaluated to ascertain position, making the motor a multi-functional element that reduces overall system complexity while providing precise position information.
2Ease of operation
If manual movement of the component is very slow, then ease of operation is improved, but use of energy by moving object decreases
Solution Approach 1:
The system dynamically adapts to varying manual movement speeds by continuously evaluating the back-EMF signal. Even at very slow movement speeds, the evaluation unit processes the generated voltage signal to determine position, ensuring operational ease while maintaining sufficient energy utilization for position ascertainment without requiring a minimum movement speed threshold.
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 solution allows for immediate and precise position ascertainment and storage of the door's position during power failures, reducing time needed for system reinitialization and eliminating the need for additional sensors, thus enhancing operational readiness and reducing costs and wear.
Implementation Method 1
the electrical machine is used, in the event of a manual movement of the component, as a generator for generating electrical energy
Implementation Method 2
a magnetic attraction reaction and/or repelling reaction between magnetic and/or magnetized parts of a rotor and of a stator
Implementation Method 3
a magnetic attraction reaction and/or repelling reaction between magnetic and/or magnetized parts of a rotor and of a stator
Data Source
AI summary
The position of a moveable component which is coupled to an electric machine is ascertained, where the electric machine serves, in the event of manual movement of the component, as a generator for generating electric energy for a position ascertainment arrangement. The coupling of the electric machine with the component is configured such that a magnetic attraction reaction and/or repelling reaction between magnetic and/or magnetized parts of a rotor and of a stator of the electric machine results in a short-term acceleration of the rotor, which is unhindered by the coupling, and in a resulting short-term increase of the electric energy generated.