Multi-Sensor Current Measurement for Opposing Nearby Conductors
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Solution Overview
Problem
Current measurement devices struggle to accurately measure currents flowing through conductors arranged in proximity with opposite directions due to mutual magnetic field interference, especially in confined spaces where installing traditional magnetic cores or sensors is challenging.
Innovation Solution
A current measurement device employing four or more triaxial magnetic sensors arranged with predefined positional relationships, coupled with a calculator to determine current flow based on detection results and positional relationships, allowing flexible arrangement and accurate non-contact measurement of currents flowing in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional magnetic core or single sensor methods are used, then measurement simplicity is maintained, but measurement precision deteriorates due to mutual magnetic field interference from conductors in proximity
Solution Approach 1:
The measurement system is segmented into multiple triaxial magnetic sensors (at least four) positioned at different locations around the conductors. Each sensor measures the magnetic field at its specific position, and the calculator processes these segmented measurements to compute the current, thereby eliminating the need for a single complex magnetic core while improving accuracy despite proximity interference.
Solution Approach 2:
A calculator acts as an intermediary that receives magnetic field detection results from multiple sensors and processes them according to a specific calculation formula. This intermediary component transforms the raw sensor data into accurate current measurements by compensating for the mutual magnetic field interference through mathematical processing.
2Ease of operation
If magnetic core is installed near conductor to be measured, then measurement capability is achieved, but ease of operation deteriorates due to space constraints in narrow installations
Solution Approach 1:
The system transitions from a single-point measurement approach to a multi-dimensional measurement approach by positioning at least four triaxial sensors at different spatial locations around the conductors. This dimensional expansion allows the system to capture magnetic field information from multiple perspectives, enabling accurate current measurement without requiring the sensors to be in direct proximity to the conductors, thus improving installation flexibility.
3Measurement precision
If multiple sensors are used to overcome magnetic field interference, then measurement precision improves, but device complexity increases
Solution Approach 1:
Each triaxial magnetic sensor serves multiple functions: it measures magnetic field components in three orthogonal directions (X, Y, Z axes) simultaneously, and collectively the sensors provide both magnitude and directional information about the magnetic field. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity despite using multiple sensors.
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
Enables flexible and accurate non-contact measurement of currents flowing in opposite directions, overcoming interference from mutual magnetic fields and space constraints, suitable for hybrid and electric vehicles with narrow installations.
Implementation Method 1
four or more triaxial magnetic sensors arranged to have predefined positional relationships such that magnetism-sensing directions thereof are parallel to each other
Implementation Method 2
a calculator configured to calculate currents flowing through a pair of conductors to be measured based on detection results of the four or more triaxial magnetic sensors
Data Source
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AI summary
A current measurement device includes: four or more triaxial magnetic sensors arranged to have predefined positional relationships such that magnetism-sensing directions thereof are parallel to each other; and a calculator configured to calculate currents flowing through a pair of conductors to be measured, which are arranged in proximity to each other, based on detection results of the four or more triaxial magnetic sensors and the positional relationships between the four or more triaxial magnetic sensors, the currents flowing in mutually opposite directions.