Rotation Angle Detector Winding Optimization
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Solution Overview
Problem
Conventional rotation angle detectors have limited options for adjusting the number of windings to reduce detection errors in the rotation angle of a rotor, making it difficult to effectively minimize the shaft angle multiplier component of the detection error.
Innovation Solution
A rotation angle detector design featuring a detecting stator with excitation coils and two types of output coils of different phases, where the number of windings can be adjusted to optimize the spatial distribution of windings based on sine wave functions, allowing for multiple configurations to reduce detection errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of windings of output coils is fixed at a single value N, then the structure is simple, but the detection error cannot be effectively reduced
Solution Approach 1:
The output coils are divided into multiple groups (first output coils and second output coils) with different winding numbers. Each group is assigned to specific teeth based on the spatial distribution pattern, allowing independent optimization of winding counts for different coil groups to reduce detection errors.
Solution Approach 2:
Different teeth are assigned different winding numbers for output coils based on their spatial position. The winding number varies locally according to the spatial distribution function, optimizing the magnetic flux distribution and reducing detection errors at specific locations.
2Measurement precision
If the number of windings is adjusted to N±m, then detection error reduction options increase, but the manufacturing complexity increases
Solution Approach 1:
The winding number parameter is varied systematically according to a spatial distribution function. By changing the winding number parameter across different coils based on their spatial position, the invention achieves error reduction while maintaining a structured approach to manufacturing.
3Measurement precision
If multiple output coils with different winding numbers are used, then detection accuracy improves, but the device structure becomes more complex
Solution Approach 1:
The output coils serve multiple functions: they generate detection signals and their varying winding numbers simultaneously reduce different components of detection error. The same coil structure achieves both signal generation and error compensation functions.
Solution Approach 2:
The winding number is made variable across different coils rather than fixed, allowing the system to dynamically adapt to different spatial positions and error characteristics, thereby improving overall detection accuracy.
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 design increases the options for adjusting the number of windings, effectively reducing the shaft angle multiplier component of the detection error, thereby improving the accuracy of the rotation angle detection.
Implementation Method 1
the excitation coils are wound respectively about the teeth; the first output coils and the second output coils are wound about mutually different teeth
Data Source
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AI summary
In a reference state of a rotation angle detector, a plurality of first output coils include first output coils having the number of windings of Ai and first output coils having the number of windings Aj that is smaller than Ai, and a plurality of second output coils include second output coils having the number of windings Bk and second output coils having the number of windings Bm that is smaller than Bk. The rotation angle detector is provided with at least one configuration from among: a configuration in which the numbers of windings of the first and second output coils are the same numbers of windings as in the reference state, with the exception that the number of windings Ai of the first output coils is the number of windings Ai±a or the number of windings Aj of the first output coils is the number of windings Aj±a; and a configuration in which the number of windings Bk of the second output coils is the number of windings Bk±b or the number of windings Bm of the second output coil is the number of windings Bm±b.