Magnetic Clutch Single Sensor Torque Detection
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Solution Overview
Problem
Magnetic clutches require two sensors to determine working parameters, increasing manufacturing costs and calibration expenses, which is inefficient.
Innovation Solution
A single sensor measures the magnetic field or its temporal differentiation resulting from the interference between the input and output magnets, with an evaluation unit processing the signal to determine working parameters, such as torque, by analyzing the shape and harmonics of the resulting magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two sensors are arranged to ascertain magnetic fields of input and output parts, then working parameters can be determined, but manufacturing costs and calibration expenses increase
Solution Approach 1:
The patent combines the functions of two separate sensors into a single sensor that measures the interference magnetic field resulting from the interaction between input and output parts. This single sensor captures sufficient information to determine working parameters like torque, thereby reducing manufacturing costs and calibration complexity while maintaining measurement capability
Solution Approach 2:
The single sensor is positioned to detect the interference magnetic field that contains information about both input and output parts simultaneously. This multi-functional approach allows one sensor to perform what previously required two separate sensors, reducing system complexity and cost
2Measurement precision
If two sensors are arranged to measure magnetic fields, then working parameters can be determined, but calibration complexity and expenses increase
Solution Approach 1:
The patent merges two separate measurement chains into one, using a single sensor to detect the interference magnetic field. This eliminates the need to calibrate two separate sensors and their respective signal processing chains, significantly reducing calibration complexity and expense
3Ease of manufacture
If a single sensor measures interference magnetic field, then manufacturing and calibration costs are reduced, but measurement capability must be sufficient
Solution Approach 1:
The interference magnetic field acts as an intermediary that carries information about both input and output parts. By measuring this intermediate phenomenon, the single sensor can determine working parameters without directly measuring each part separately, maintaining measurement precision while reducing system complexity
Solution Approach 2:
The patent changes the measurement parameter from measuring individual magnetic fields to measuring the interference magnetic field. This parameter change allows a single sensor to capture combined information from both parts, achieving the same measurement objective with reduced hardware
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 instrumental and calibration costs while providing a reliable and economical method to determine working parameters, including torque, by leveraging the change in magnetic field characteristics due to angular offset between the input and output parts.
Implementation Method 1
measuring the temporal shape of a magnetic field resulting from an interference of a magnetic field of the input part with a magnetic field of the output part or its temporal differentiation
Data Source
AI summary
A magnetic clutch has a rotatable input part with first magnets and a rotatable output part with second magnets, the output part being magnetically coupled to the input part. At least one sensor measures a magnetic field or its temporal differentiation and is positioned to measure the magnetic field or its temporal differentiation resulting from the interference of the magnetic field of the first magnets of the input part with the magnetic field of the second magnets of the output part. The output of the sensor is processed by an evaluation unit operative to determine at least one working parameter.