Resolver Angle Detection Reducing Magnetic Interference
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Solution Overview
Problem
Redundant system resolvers experience magnetic interference, leading to increased harness cost and processing load due to the need for synchronous control between systems to accurately calculate rotational angles.
Innovation Solution
An angle detection apparatus with a resolver having separate excitation and output windings, where AC voltages of different cycles are applied to each system, and component removal processing is performed to isolate and remove interference components from output signals, allowing for accurate angle calculation without real-time synchronous control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronous control is implemented between first and second systems to calculate rotational angles, then measurement precision is improved, but device complexity and processing load increase
Solution Approach 1:
The patent extracts and removes the harmful second cycle component from the first system's output signals through component removal processing. By isolating and eliminating the interference signal, the system achieves accurate rotational angle calculation without requiring complex synchronous control between the two systems, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces an intermediary processing stage (component removal processing unit) that acts as a mediator between the first and second systems. This intermediary removes the magnetic interference component from the output signals, enabling independent operation of each system while maintaining measurement accuracy, thereby reducing the need for direct synchronous control
2Measurement precision
If synchronous control is implemented between systems, then measurement precision is improved, but processing load increases
Solution Approach 1:
The patent extracts and removes the harmful second cycle component from the first system's output signals through component removal processing. By isolating and eliminating the interference signal, the system achieves accurate rotational angle calculation without requiring complex synchronous control between the two systems, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent performs preliminary component removal processing to eliminate interference before the rotational angle calculation is performed. By preparing the output signals in advance by removing the second cycle component, the system reduces the processing load during real-time operation while maintaining measurement accuracy
3Device complexity
If magnetic interference occurs between systems, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent converts the harmful magnetic interference (second cycle component) into a beneficial feature by using it for identification and removal. The interference signal, though harmful to measurement precision, is characterized by its distinct second cycle frequency, which is then exploited to design the component removal processing that selectively eliminates the interference while preserving the useful first cycle signal
Solution Approach 2:
The patent changes the frequency parameter of the excitation signals, using the first system at a first cycle and the second system at a second cycle (longer than the first cycle). This parameter differentiation allows the component removal processing to distinguish and eliminate the second cycle interference from the first system's output, maintaining measurement precision while keeping the system structure simple
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 the impact of magnetic interference and enables accurate rotor angle calculation with reduced processing load and harness costs by eliminating the need for real-time synchronous control between systems.
Implementation Method 1
a resolver that is provided with a first system excitation winding, first system two output windings, a second system excitation winding, and second system two output windings
Implementation Method 2
magnetic interference occurs between a first system and a second system
Data Source
AI summary
Even using the redundant system resolver in which the magnetic interference between systems occurs, to provide an angle detection apparatus which can reduces the influence of the magnetic interference and can calculate the rotational angle with good accuracy, without performing synchronous control between systems in real time. An angle detection apparatus is provided with a resolver which has the first system windings and the second system windings in which magnetic interference occurs between systems; a first system removal processing unit that performs a second cycle component removal processing which removes component of the second cycle of the second system, to detection values of the first system winding output signals; and a first system angle calculation unit that calculates a first angle of rotor, based on the detection values of the first system winding output signals after the second cycle component removal processing.