Stator Winding Split Ratio for Rotation Detector Accuracy
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Solution Overview
Problem
Conventional stator winding methods for rotation detectors face limitations in reducing flux linkage imbalance between output windings, leading to variations in output signals due to sinusoidal variation in the number of turns around slots, making it difficult to achieve high detection accuracy.
Innovation Solution
A stator winding method where the first output winding is divided into lower-layer and upper-layer windings with varying turns, and the split ratio is adjusted sinusoidally to balance the flux linkage contribution between the two windings, ensuring consistent output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of turns of output windings is varied sinusoidally to achieve sine wave magnetic flux distribution, then the magnetic flux distribution follows a sine wave pattern, but the contribution to flux linkage becomes imbalanced between output windings, leading to variation in output signals
Solution Approach 1:
The first output winding is divided into two separate windings: a lower-layer first output winding and an upper-layer first output winding. This segmentation allows independent control of turns for each winding, enabling precise adjustment of flux linkage contribution from each layer to achieve balanced total contribution while maintaining sinusoidal variation pattern
Solution Approach 2:
The split ratio between lower-layer and upper-layer windings is adjusted locally in specific slots where detection accuracy is insufficient. By applying different split ratios to different slots, the invention achieves local optimization of flux linkage balance without disrupting the overall sinusoidal distribution pattern across all slots
2Measurement precision
If the order of winding output windings is alternated from one slot to the next, then flux linkage contribution can be equalized when number of turns is constant, but this method becomes ineffective when number of turns varies sinusoidally, failing to reduce output signal variation
Solution Approach 1:
Instead of alternating the order of complete output windings, the invention segments the first output winding into lower-layer and upper-layer windings. The lower-layer winding is wound in all slots first, then the upper-layer winding is wound in all slots, creating a systematic layered structure that simplifies the winding process while achieving flux linkage balance through controlled split ratios
Solution Approach 2:
The invention changes the parameter of split ratio (the proportion of turns between lower-layer and upper-layer windings) to achieve flux linkage balance. By adjusting this parameter in specific slots, the invention compensates for the sinusoidal variation in total turns while maintaining a consistent and systematic winding structure
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 approach reduces signal variations, enhancing the detection accuracy of rotation angles by equalizing the flux linkage contribution between output windings, thereby improving the overall performance of the rotation detector.
Implementation Method 1
the stator includes a stator core that is ring shaped and has a plurality of magnetic poles... The stator core has a first output winding and a second output winding... each of the N1(s) turns and the N2(s) turns being varied sinusoidally through the slots
Data Source
AI summary
The N1(s) turns of a first output winding is divided by a split ratio α into N1a(s) turns of a lower-layer first output winding and N1b(s) of an upper-layer first output winding. The lower-layer first output winding is continuously wound around all slots as the undermost layer. A second output winding is continuously wound around all slots over the lower-layer first output winding. An upper-layer first output winding is continuously wound around all slots over the second output winding. The split ratio α is adjusted only in the slots where the detection accuracy decreases. This equalize the contribution of the first output windings and the second output winding to the flux linkage, thereby achieving high angle detection accuracy.