Inductive Angle Sensor With Sector Coils and Iron Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inductive angle measurement methods in the automotive industry face challenges in accuracy, power consumption, and robustness against external influences such as temperature and magnetic fields.
Innovation Solution
The method employs multiple transmitter coils distributed around a rotational axis and a sector-shaped iron core element, where the iron core element covers a portion of the coils varying from 0% to 100% depending on the angle, allowing for precise angle determination by analyzing secondary voltage pulses induced in the coils, and using a microprocessor for calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional inductive angle measurement methods are used, then the system is simple in structure, but the measurement accuracy is insufficient and power consumption is high
Solution Approach 1:
The stator is divided into multiple transmitter coils arranged in different sectors around the rotational axis. Each transmitter coil independently measures the angle in its specific sector by detecting the iron core element's position, enabling full 360-degree measurement coverage through segmentation of the measurement space.
2Reliability
If traditional inductive angle measurement methods are used, then the device structure is simple, but the system shows reduced robustness against external influences such as temperature and magnetic fields
Solution Approach 1:
Each transmitter coil is configured with specific sector-shaped winding patterns optimized for its measurement sector. The iron core element features corresponding sector-shaped protrusions that interact with individual transmitter coils, creating localized measurement zones with optimized magnetic field characteristics resistant to external interference.
3Measurement precision
If traditional inductive angle measurement methods are used, then power consumption is high, but measurement accuracy is insufficient
Solution Approach 1:
The measurement system activates transmitter coils periodically in a sequential manner according to the rotating angle position, rather than keeping all coils continuously active. This periodic activation reduces overall power consumption while maintaining accurate angle measurement through timed detection cycles.
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 enhances the accuracy and robustness of angle measurement while reducing power consumption, allowing for reliable operation in the automotive industry by focusing on the central, homogeneous magnetic field area and optimizing coil coverage.
Implementation Method 1
electrical primary voltage pulses are applied to the individual transmitter coils. The primary voltage pulses each induce a secondary voltage pulse in at least one of the other coils
Implementation Method 2
An iron core element is rotationally locked with the second machine element. The iron core element is opposite the transmitter coils in the form of a sector about the rotational axis
Data Source
AI summary
A method and an angle sensor for contactless measurement of an angle between a first machine element and a second machine element rotatable with respect thereto. A plurality of coils are non-rotatably connected to the first machine element and include transmitter coils—distributed around the rotational axis. Each of the transmitter coils is arranged in a sector about the rotational axis. An iron-core element non-rotatably connected to the second machine element is disposed in a sector opposite the transmitter coils. Based on applying voltage pulses, a determination of the angle to be measured is effected starting from a ratio formation between the amplitude of a secondary voltage pulse associated with a selected transmitter coil and a peak amplitude.