Vernier Resolver Coil Layout for Magnetic Noise Immunity
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Solution Overview
Problem
Conventional resolvers face challenges in detecting the angle of rotation due to susceptibility to external magnetic fields and optimal air gap differences between coils with different multiplication factors, affecting detection capability and magnetic field distribution.
Innovation Solution
A resolver design featuring a first coil group with a multiplication factor of n× and a second coil group with a multiplication factor of (n−1)×, both with ring-shaped coils placed coaxially and at different radial positions, utilizing the vernier principle to enhance angle detection accuracy and immunity to magnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a coil with multiplication factor of 1× is used, then the coil area is relatively large which facilitates absolute angle determination, but the coil becomes susceptible to external magnetic fields reducing detection capability
Solution Approach 1:
The invention divides the detection system into multiple coil groups with different multiplication factors (1×, n×, and (n−1)×). Each coil group handles specific detection tasks, allowing the system to determine absolute angle using the 1× coil while using n× and (n−1)× coils for high-resolution relative angle detection, thereby reducing the impact of external magnetic fields on overall detection capability.
Solution Approach 2:
The invention changes the multiplication factor parameter of different coil groups to optimize their respective functions. The 1× coil is optimized for absolute angle determination, while n× and (n−1)× coils are optimized for high-resolution relative angle detection. This parameter differentiation allows each coil to operate in its optimal performance range.
2Measurement precision
If coils with different multiplication factors are used, then angular resolution increases, but optimal air gap values differ making it difficult to set appropriate air gaps for each coil
Solution Approach 1:
The invention applies different multiplication factors to different radial positions of coil groups, creating local optimization at each position. The 1× coil group operates optimally at its designated radial position, while n× and (n−1)× coil groups operate optimally at their respective radial positions. This local quality differentiation allows each coil group to have its own optimal air gap without requiring complex global optimization.
Solution Approach 2:
The invention resolves the air gap conflict by introducing a radial dimension differentiation. Instead of trying to optimize all coils at a single air gap distance, the system places coil groups at different radial positions where each can achieve its optimal air gap. This transforms the problem from a one-dimensional air gap optimization to a two-dimensional solution involving both radial positioning and air gap settings.
3Measurement precision
If multiple coil groups with different multiplication factors are used, then angle detection capability improves, but the configuration becomes more complex
Solution Approach 1:
The invention merges multiple coil groups with different multiplication factors (1×, n×, and (n−1)×) into a unified detection system. By combining the absolute angle determination capability of the 1× coil with the high-resolution relative angle detection of the n× and (n−1)× coils, the system achieves comprehensive angle detection capability while maintaining a relatively integrated structure.
Solution Approach 2:
The resolver system achieves multi-functionality by enabling both absolute angle determination and high-resolution relative angle detection within a single device. The different coil groups serve different detection purposes, making the system universal in handling various angle detection requirements without needing separate systems.
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 improves angle detection capability, reduces magnetic noise interference, and optimizes magnetic field distribution with a simple setup, increasing detection accuracy and reducing the complexity of air gap settings.
Implementation Method 1
A resolver that detects the angle of rotation of a rotor relative to a stator
Data Source
AI summary
A resolver includes a first coil group and a second coil group. The first coil group has a first exciting coil and a first detecting coil that have a multiplication factor of angle of nX (where n is a natural number equal to or greater than three), are placed coaxially with the axis of rotation of the rotor, and each have a ring shape. The second coil group has a second exciting coil and a second detecting coil that have a multiplication factor of angle of (n−1)×, are placed coaxially with the axis of rotation of the rotor, and each have a ring shape. Furthermore, the first coil group and the second coil group are provided at positions different in a radial direction from each other.