Resolver Angle Detection With First-Order Eccentricity Correction
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Solution Overview
Problem
Existing angle detection systems using resolvers face challenges in reducing detection errors due to eccentricity, particularly with high-order error components that are difficult to process accurately due to increased calculation load and sampling frequency restrictions.
Innovation Solution
An angle detection apparatus with a resolver having a stator and rotor design that includes first and second system excitation windings and output windings, employing first-order component reduction processing to minimize errors caused by eccentricity, using a controller to apply AC voltage and detect output signals, and perform reduction processing to calculate the rotor's angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-order error components are reduced through complex processing, then angle detection accuracy is improved, but calculation processing load increases
Solution Approach 1:
The patent extracts and removes only the dominant first-order error component from the output signals using simple subtraction processing, rather than attempting to process all high-order error components. This selective extraction achieves significant error reduction while keeping calculation load low.
Solution Approach 2:
The patent changes the approach from processing multiple high-order frequency components to focusing on the first-order component. By applying first-order component reduction processing specifically to the fundamental frequency component, the system achieves effective error reduction with minimal calculation overhead.
2Measurement precision
If sampling frequency is increased to reduce detection errors, then angle detection accuracy is improved, but system complexity and processing requirements increase
Solution Approach 1:
The patent extracts the first-order error component from the output signals and removes it through simple processing. This allows accurate angle detection without requiring high sampling frequencies, as the method targets and eliminates the dominant error source directly.
Solution Approach 2:
Instead of attempting to address all error components or using excessive sampling rates, the patent applies partial action by focusing specifically on the first-order component. This selective approach achieves sufficient accuracy without the complexity of high-frequency sampling systems.
3Measurement precision
If geometric arrangement of windings is modified to reduce eccentricity errors, then angle detection accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent converts the harmful effect of eccentricity into a detectable first-order error component in the output signals. By measuring and removing this component through signal processing, the system compensates for geometric imperfections without requiring precise manufacturing.
Solution Approach 2:
The patent replaces complex mechanical/geometric precision requirements with a simpler signal processing approach. Instead of requiring perfect winding arrangements, the system uses first-order component reduction processing to achieve accurate angle detection, substituting mechanical precision with computational correction.
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
The apparatus effectively reduces first-order mechanical angle errors caused by eccentricity, minimizing high-order components while maintaining low calculation processing load and sampling frequency, thereby improving accuracy.
Implementation Method 1
a resolver that is provided with a stator which is provided with a first system excitation winding and first system two output windings, and a rotor which is provided with a salient pole
Data Source
AI summary
To provide an angle detection apparatus which can reduce the error of the angle which is caused by the eccentricity, by performing the reduction processing about smallest possible number of frequency bands and the lowest possible order of frequency band. An angle detection apparatus performs a first-order component reduction processing which reduces a first-order component which is a component of one rotation period in a mechanical angle of the rotor, to each of the first system two output signals; and calculates a first angle of the rotor, based on the first system two output signals to which the first-order component reduction processing was performed.