Resolver With Multiplication Factor Angle Signal Processing
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Solution Overview
Problem
Conventional resolvers face challenges in reducing size and complexity while increasing angular resolution, often requiring multiple coils and excitation circuits, which complicates the apparatus and increases its size.
Innovation Solution
A resolver design that includes sine and cosine exciting coils on the stator and detecting coils on the rotor, with a closed circuit configuration, allowing for alternating current signals 90 degrees apart in phase, and separate coil groups with different multiplication factors for enhanced angular resolution and simplified configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna coils are placed in the resolver to transmit signals from rotor to stator, then signal transmission is achieved, but the placement becomes an obstacle to reduction in resolver size
Solution Approach 1:
The patent removes the antenna coils from the resolver structure entirely. Instead of using antenna coils for signal transmission, the invention uses the detecting coil signals directly through a signal processing circuit that calculates the multiplication factor of angle, thereby eliminating the space-consuming antenna coil components while maintaining signal transmission capability.
Solution Approach 2:
The detecting coil serves multiple functions: it detects the rotor position and provides signals that are processed to determine the multiplication factor of angle. This multi-functional approach eliminates the need for separate antenna coils, reducing the overall resolver size while maintaining full signal transmission and detection capabilities.
2Measurement precision
If resolvers with different multiplication factors are combined to increase angular resolution, then angular resolution increases, but the number of coils and excitation circuits increases making the apparatus larger and more complicated
Solution Approach 1:
The patent segments the signal processing into distinct stages: first obtaining signals from the detecting coil, then calculating the multiplication factor of angle through sequential mathematical operations (obtaining first signal, second signal, third signal, and finally the multiplication factor). This segmentation allows high angular resolution to be achieved through software/mathematical processing rather than through multiple physical coil systems.
Solution Approach 2:
The invention replaces the mechanical approach of using multiple physical coil systems with different multiplication factors with a mathematical/signaling approach. A single detecting coil system is used, and the different multiplication factors are achieved through signal processing and calculation, thereby reducing device complexity while maintaining high angular resolution.
3Measurement precision
If multiple exciting coils and detecting coils are used to increase angular resolution, then angular resolution increases, but the apparatus size increases
Solution Approach 1:
The patent transitions from a spatial dimension solution (adding more physical coils in different locations) to a mathematical dimension solution (processing signals through multiple calculation stages). The angular resolution is enhanced by introducing the multiplication factor of angle through mathematical operations on the detecting coil signals, rather than by physically expanding the apparatus with more coils.
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 enables increased angular resolution with a simpler configuration, reducing the size and complexity of the resolver, and eliminates the need for antenna coils, thereby facilitating effective space use and reducing manufacturing costs.
Implementation Method 1
alternating current voltages that are 90 electrical degrees apart in phase are applied to two exciting coils placed in the stator and a detecting coil placed in the rotor acquires a signal obtained by adding the two alternating current voltages
Implementation Method 2
a detecting coil placed in the rotor acquires a signal obtained by adding the two alternating current voltages. Such a resolver is called a two-phase excitation/single-phase output resolver
Data Source
AI summary
A resolver includes: a sine exciting coil and a cosine exciting coil; a detecting coil that is provided to a rotor and is placed facing the sine exciting coil and the cosine exciting coil; an exciting coil forming a closed circuit, together with the detecting coil, in the rotor; and a sine detecting coil and a cosine detecting coil that are provided to a stator, are placed facing the exciting coil, and transmit alternating current signals that are 90 electrical degrees apart in phase. The multiplication factor of angle of the sine detecting coil, the cosine detecting coil, and the exciting coil is different from the multiplication factor of angle of the sine exciting coil, the cosine exciting coil, and the detecting coil.