Rotation Angle Sensor Radial Deviation Compensation
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Solution Overview
Problem
Existing rotation angle sensors fail to accurately compensate for radial deviations between the stator and rotor elements due to bearing play or production tolerances, leading to inaccuracies in measured angle detection.
Innovation Solution
Incorporating a compensation element with a compensation transmission coil and reception coils on the stator, which emits an electromagnetic compensation alternating field inductively coupled with a conductive section on the rotor, allowing for monitoring of relative radial arrangements and detection of tolerances through induced AC voltages, enabling accurate radial deviation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bearing play or manufacturing tolerances cause radial deviations between stator and rotor elements, then the structural simplicity is maintained, but the measurement precision deteriorates
Solution Approach 1:
The sensor is divided into two functionally independent systems: a compensation system with compensation transmitting and receiving coils for detecting radial deviations, and an angle detection system with angle-sensing coils for measuring rotation angles. This segmentation allows each subsystem to perform its specific function optimally without interfering with the other, resolving the contradiction between structural simplicity and measurement precision.
Solution Approach 2:
The compensation system acts as an intermediary that detects and compensates for radial deviations between stator and rotor elements. By introducing this intermediate detection mechanism, the system can maintain simple overall structure while achieving high measurement precision through active compensation of positioning errors.
2Measurement precision
If compensation systems are added to detect and compensate radial deviations, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The compensation system and angle detection system share common structural elements such as the stator and rotor elements, coils, and magnetic circuits. By merging these systems into a unified sensor structure rather than adding separate compensation devices, the patent achieves high measurement precision while minimizing the increase in device complexity.
Solution Approach 2:
The stator and rotor elements serve dual functions: they are structural components that support both the compensation system and the angle detection system, and they are measuring components that enable both radial deviation detection and rotation angle measurement. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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 solution enables precise measurement of radial deviations by interpreting compensation AC voltages as signals indicating deviations from the ideal radial arrangement, allowing for vectorial measurement of x and y tolerances without conversion, thus improving the accuracy and reliability of rotation angle detection.
Implementation Method 1
a compensation element (1) arranged on the stator element (12), the compensation element (1) comprising a compensation transmitting coil (28) for emitting an electromagnetic compensation alternating field and at least one compensation receiving coil (30, 31) for receiving electromagnetic alternating fields
Implementation Method 2
at least one angle-sensing transmitting coil (22) for emitting an electromagnetic angle-sensing alternating field and at least one angle-sensing receiving coil (20) for sensing electromagnetic alternating fields
Data Source
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AI summary
The invention relates to a rotation angle sensor (10) comprising a stator element (12) and a rotor element (14) which is mounted in a rotatable manner about an axis of rotation (A) with respect to the stator element (12), wherein the rotation angle can be captured by means of inductive coupling between the rotor element (14) and the stator element (12), wherein a compensation element (1) is arranged on the stator element (12), wherein the compensation element (1) has a compensation transmitting coil (28) for emitting an alternating electromagnetic compensation field and at least one compensation receiving coil (30, 31) for receiving alternating electromagnetic fields, wherein the rotor element (14) has a first electrically conductive section (32), wherein the first electrically conductive section (32) is arranged on the rotor element (14) and is inductively coupled to the compensation transmitting coil (28) and to the at least one compensation receiving coil (30, 31) of the compensation element (1) in such a manner that, when the compensation transmitting coil (28) emits the alternating electromagnetic compensation field, a compensation AC voltage induced in the at least one compensation receiving coil (30, 31) is predominantly dependent on a relative radial arrangement of the stator element (12) and of the rotor element (14) with respect to one another with regard to the axis of rotation (A), wherein the stator element (12) has at least one angle capture transmitting coil (22) for emitting an alternating electromagnetic angle capture field and at least one angle capture receiving coil (20) for capturing alternating electromagnetic fields, wherein the rotor element (14) has at least one second electrically conductive section (26), wherein the at least one second electrically conductive section (26) is inductively coupled to the at least one angle capture receiving coil (20) in such a manner that, when the at least one angle capture transmitting coil (22) emits the alternating electromagnetic angle capture field, at least one angle capture AC voltage is induced in the at least one angle capture receiving coil (20), wherein the at least one second electrically conductive section (26) is arranged on the rotor element (14) in such a manner that the angle capture AC voltage induced in the at least one angle capture receiving coil (20) is, in particular predominantly, dependent on a rotation angle between the stator element (12) and the rotor element (14), wherein the at least one second electrically conductive section (26), when considered in the radial direction with respect to the axis of rotation (A), is arranged outside the first electrically conductive section (32) on the rotor element (14), and wherein the at least one angle capture transmitting coil (22), when considered in the radial direction with respect to the axis of rotation (A), is arranged outside the compensation element (1) on the stator element (12).