Resolver Stator Sinusoidal Winding Harmonic Reduction
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Solution Overview
Problem
Existing resolvers are sensitive to harmonics, increase manufacturing costs, and complicate output signal analysis due to differences in impedance between coils and complex winding patterns.
Innovation Solution
A stator with multiple slots wound in a sinusoidal pattern, where the excitation coil and output coils have windings that alternate direction and number based on a sinusoidal function, maintaining a 90° phase difference, reducing harmonic sensitivity and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coils are wound sequentially around slots using a simple method, then the winding process is simple, but impedance differences occur between coils and harmonic sensitivity increases
Solution Approach 1:
The patent applies parameter changes by varying the winding direction parameter systematically. Coils in odd-numbered slots are wound in one direction while coils in even-numbered slots are wound in the opposite direction. This parameter variation compensates for cumulative winding errors, ensuring that impedance values across all coils remain consistent within ±5%, thereby resolving the impedance consistency problem while maintaining manufacturing simplicity
Solution Approach 2:
The patent implements periodic action through alternating winding directions in a regular pattern across consecutive slots. This periodic alternation creates a systematic compensation mechanism where the directional changes counteract cumulative deviations, reducing harmonic sensitivity and ensuring uniform electrical characteristics across all coils without complicating the manufacturing process
2Reliability
If total number of turns is increased to obtain predetermined transformation ratio, then transformation ratio is achieved, but manufacturing costs increase and output signal analysis becomes complicated
Solution Approach 1:
The patent applies segmentation by dividing the total winding requirement into discrete slots with specific turn allocations. Instead of uniformly increasing turns across all coils, the invention segments the winding distribution according to the sinusoidal function, assigning different turn numbers to different slots. This segmented approach achieves the required transformation ratio while simplifying the overall winding pattern and reducing manufacturing complexity
Solution Approach 2:
The patent implements local quality by varying the number of turns in each slot according to the sinusoidal distribution pattern. Each slot receives a specific number of turns tailored to its position in the sinusoidal cycle, creating local variations in winding density that collectively produce the desired transformation ratio. This localized optimization simplifies the global winding pattern and reduces manufacturing costs
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 reduces harmonic sensitivity, improves precision, and simplifies output signal analysis, while reducing manufacturing costs and enhancing the reliability of the resolver.
Implementation Method 1
a variable reluctance type resolver including a stator in which an excitation winding and an output winding are received
Implementation Method 2
the excitation coil is wound in a circumferential direction according to a sinusoidal function
Data Source
Figure 1~2
Figure 3~4
Figure 5A
AI summary
The present invention relates to a stator used in resolvers, in which multiple slots are formed at constant intervals in a circumferential direction and have an excitation coil, a first output coil, and a second output coil, respectively, wound therearound, wherein the first output coil is wound at the same number of windings in accordance with an order of multiple slots in a circumferential direction by alternating the winding direction by two slots, the second output coil is wound at the same number of windings in accordance with an order of multiple slots in a circumferential direction by alternating the winding direction by two slots, the excitation coil is wound by the number of windings that is changed in a sinusoidal wave form in accordance with the order of the multiple slots in the circumferential direction by a method of alternating the winding direction by at least two slots.