Off-Axis Motor Angle Sensing With Magnetic Amplitude Correction
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Solution Overview
Problem
Existing methods for determining the angular position of an electric motor in a clutch actuation system, particularly with off-axis sensor arrangements, suffer from significant errors exceeding 20° and dynamic tolerances due to tumbling magnetic rings, leading to inaccurate position detection.
Innovation Solution
The method involves evaluating the amplitude information of the magnetic field to determine a correction parameter, which corrects the angular error by considering the tangential and radial magnetic field directions, allowing for precise angular position determination without complex or costly magnet design changes, and adapts dynamically to compensate for errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an off-axis sensor arrangement is used to determine angular position, then the device complexity is reduced and manufacturing is simplified, but measurement precision deteriorates with errors exceeding 20°
Solution Approach 1:
The patent applies parameter changes by utilizing amplitude information of the magnetic field signal as an additional parameter for correction. By analyzing the amplitude variations of the magnetic field vector in different spatial directions, the system determines correction parameters that compensate for angular errors, thereby improving measurement precision while maintaining the simple off-axis sensor arrangement
Solution Approach 2:
The patent implements feedback by using the amplitude information from the magnetic field to generate correction parameters that are applied to correct the angular position determination. This feedback mechanism continuously compensates for errors caused by the off-axis sensor arrangement and magnetic ring tumbling, maintaining high measurement accuracy
2Device complexity
If a magnetic ring is fixed concentrically on the rotating component, then the device structure is simplified, but measurement precision deteriorates due to dynamic tolerances from tumbling
Solution Approach 1:
The patent uses feedback by continuously monitoring the amplitude information of the magnetic field signal and using it to determine correction parameters. These correction parameters compensate for dynamic errors caused by magnetic ring tumbling, allowing the system to maintain high measurement precision despite the simple concentric mounting structure
Solution Approach 2:
The patent applies parameter changes by utilizing the amplitude variations of the magnetic field signal as a correction parameter. This parameter is used to compensate for angular errors caused by magnetic ring tumbling, thereby maintaining measurement precision without requiring complex mounting structures
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 significantly reduces angular position errors, providing accurate and cost-effective determination of the electric motor's angular position, both statically and dynamically, by using a simple mathematical method based on amplitude information from the magnetic field.
Implementation Method 1
a magnetic ring that is fixed to and concentrically disposed on the rotating component builds up a magnetic field that changes relative to the sensor arrangement and that is detected by the sensor arrangement
Data Source
AI summary
A method for determining an angular position of a rotating component is disclosed. A sensor system is positioned at a radial distance from an axis of rotation of the rotating component. A magnetic ring is arranged fixedly and concentrically on the rotating component, generating a magnetic field that changes with respect to the sensor system. The sensor system detects the magnetic field in which a signal is captured and evaluated with respect to the angular position. Errors in the measurement of the angular position can be corrected. The signal captured by the sensor system is evaluated with respect to the amplitude information of the magnetic field. A correction parameter is determined from the amplitude information, and an angle error is of the angular position is determined based on the correction parameter. The angle error is used to correct the angular position.