Electric Motor Rotor Angle Determination via Signal Segmentation
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Solution Overview
Problem
Existing methods for determining the angle of an electric motor rotor lack precision, especially due to variable error terms from temperature and sensor age, affecting the efficient conversion of electrical energy into mechanical propulsion.
Innovation Solution
A method involving a control unit that processes rotor position signals from sensors to derive angular velocity and filter base signals, allowing for precise angle determination by separating sinusoidal contributions from error terms, using trigonometric functions and filter modules to enhance accuracy and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional rotor angle determination methods are used, then the system is simple, but the determination precision is insufficient due to variable error terms from temperature and sensor age
Solution Approach 1:
The rotor position signal is segmented into two distinct components: a sinusoidal contribution from rotational movement and an error term from temperature and sensor age. This segmentation allows each component to be processed separately, with the sinusoidal part used for accurate angle determination and the error part filtered out, thereby improving precision without proportionally increasing complexity
Solution Approach 2:
The error term is extracted and separated from the rotor position signal through signal processing. By identifying and isolating the error components related to temperature and sensor age, the system can exclude these from the angle calculation, improving measurement precision while managing complexity through targeted error removal rather than comprehensive signal reprocessing
2Measurement precision
If high-resolution sampling is used to improve angle determination, then measurement precision improves, but resource consumption increases
Solution Approach 1:
The method extracts only the essential sinusoidal component from the sampled rotor position signal to determine the rotor angle, while discarding the error term. This extraction approach allows accurate angle determination using moderate sampling rates without requiring excessive computational resources for processing high-resolution data that contains mostly error information
Solution Approach 2:
The system dynamically adjusts the processing parameters based on the separated signal components. By changing the processing focus from analyzing all signal details to specifically tracking the sinusoidal component's phase and amplitude, the system achieves high angular determination accuracy with reduced computational resource consumption
Data Source
AI summary
A method for determining the angle of the rotor of an electric motor includes receiving a first rotor position signal from a rotor position sensor by using a control unit, the first rotor position signal including a plurality of orders; determining the angular velocity of the electric motor at least by way of the first rotor position signal by using an angular velocity module of the control unit; determining a first base signal by way of the determined angular velocity and the first rotor position signal by using a first filter module of the control unit; and determining the angle of the rotor at least by way of the determined first base signal by using an angle module of the control unit.