Resolver Coil Configuration for Uniform Magnetic Flux
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Solution Overview
Problem
Conventional resolvers face challenges in accurately detecting rotation angles due to uneven magnetic flux distribution between excitation and detection coils, leading to decreased peak signal intensity and increased angle errors.
Innovation Solution
A resolver design featuring sheet-like excitation and detection coils with alternating sine and cosine coils, where the coils have identical circumferential intervals and magnetic pole configurations, ensuring uniform magnetic flux distribution and improved signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the excitation coil is disposed in a region divided into fewer sections than the detection coil, then the magnetic flux distribution becomes uneven, but the device complexity is reduced
Solution Approach 1:
The invention applies asymmetry by deliberately creating a mismatch between the number of sections in the excitation coil region and the detection coil region. Specifically, the excitation coil is disposed in a region divided into a first number of sections, while the detection coil is disposed in a region divided into a second number of sections that is different from the first number. This asymmetric configuration allows the magnetic flux from the excitation coil to be distributed across multiple detection coil sections, creating a more robust signal that is less sensitive to positioning errors and improves angle detection accuracy without overly complicating the device structure.
2Area of stationary object
If the magnetic flux from the excitation coil is distributed over a wider range than the detection coil effective region, then the peak signal intensity decreases, but the magnetic field coverage is improved
Solution Approach 1:
The invention applies local quality by optimizing the spatial distribution of magnetic flux density across different regions. By dividing the excitation coil region into a specific number of sections and the detection coil region into a different number of sections, the magnetic flux is distributed in a controlled manner. This creates regions of varying flux density that are optimized for their specific functions: the excitation region provides broad coverage while the detection region concentrates flux in effective zones, thereby maintaining signal peak intensity without sacrificing overall magnetic field coverage.
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 configuration enhances the detection performance of rotation angles by equalizing signal intensity and reducing angle errors, thereby improving the accuracy and robustness of angle detection.
Implementation Method 1
one of the excitation coil and the detection coil includes a plurality of sine coils and a plurality of cosine coils that transmit AC signals having phases of an electrical angle different from each other by 90 degrees. The other of the excitation coil and the detection coil has an annular magnetic pole group in which a plurality of magnetic poles is disposed adjacent to each other
Data Source
AI summary
A resolver includes excitation coils and a detection coil. One of the excitation coils and the detection coil includes a sine coil and a cosine coil that transmit AC signals having phases of the electrical angle different from each other by 90 degrees. Further, the other coil is provided with an annular magnetic pole group in which a plurality of magnetic poles is disposed adjacent to each other in the circumferential direction at a facing face at which the rotor and the stator face each other. The plurality of sine coils and the plurality of the cosine coils are alternately disposed adjacent to each other in the circumferential direction at the facing face. The circumferential intervals between the magnetic poles included in the excitation coils and the detection coil are identical.