Busbar Current Sensor Alignment Using Stopper and Crush Rib
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Solution Overview
Problem
Busbar-separate-type current sensors face misalignment issues between the busbar and magnetic sensor due to difficulties in maintaining a stable positional relationship, which affects measurement accuracy, especially under conditions of heat or vibration.
Innovation Solution
A current sensor design featuring a magnetic sensor, an insertion hole with a stopper portion, and a crush rib that tightly fits with a protruding portion of the busbar, ensuring precise alignment and reducing misalignment through a combination of stopper and crush rib engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a busbar-separate-type current sensor is used, then standardization and cost reduction are achieved, but misalignment between the busbar and magnetic sensor occurs due to difficulty in maintaining stable positional relationship
Solution Approach 1:
The crush rib is pre-formed with a pressing portion that protrudes toward the busbar. When the busbar is inserted, this pre-positioned pressing portion automatically engages with the busbar surface, applying crushing force to create a recess that tightly fits the protruding portion of the busbar. This preliminary action ensures accurate alignment before final fastening occurs.
Solution Approach 2:
The crush rib acts as an intermediary element between the main body and the busbar. It mediates the connection by being crushed to form a tight-fit recess that receives the protruding portion of the busbar, thereby establishing a precise positional relationship without requiring direct rigid fixation mechanisms.
2Measurement precision
If pressing means are used to stabilize the distance between magnetic sensor and busbar, then alignment is improved, but sufficient pressing force cannot be applied and misalignment occurs during busbar insertion or fastening
Solution Approach 1:
The crush rib undergoes a parameter change from its initial state with a pressing portion protruding toward the busbar to its crushed state forming a tight-fit recess. This parameter change enables the structure to transition from a positioning element to a locking element, maintaining alignment through the formed recess rather than relying on continuous pressing force.
Solution Approach 2:
The crush rib performs self-service by being crushed during busbar insertion to automatically form a tight-fit recess that secures the busbar in the correct position. The structure uses the insertion process itself to create the alignment mechanism, eliminating the need for separate high-force pressing means.
3Measurement precision
If pressing means are used to maintain alignment, then initial alignment is achieved, but misalignment is likely to occur when pressing force decreases due to heat or vibration
Solution Approach 1:
The crush rib is designed to be crushed in advance during busbar insertion, creating a tight-fit recess that permanently locks the busbar position. This beforehand action cushions against future misalignment caused by heat or vibration, as the formed recess provides a mechanical constraint that maintains alignment regardless of subsequent environmental conditions.
Solution Approach 2:
The crush rib is a sacrificial element that is deliberately crushed during assembly to create the alignment feature. This disposable component performs its alignment function through controlled deformation, providing reliable positioning without requiring durable, complex pressing mechanisms that would be susceptible to heat and vibration.
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
The design effectively maintains alignment between the busbar and magnetic sensor, enhancing measurement accuracy and reducing misalignment due to environmental factors like heat or vibration.
Implementation Method 1
the first protruding portion formed in the plate surface is press-fitted while crushing the crush rib provided in the main body, thereby enabling the crush rib and the first protruding portion to be tightly fitted together
Implementation Method 2
a magnetic sensor configured to detect a magnetic field generated by a busbar when a current to be measured flows
Data Source
AI summary
A current sensor according to the invention to be attached to a busbar and used includes a magnetic sensor configured to detect a magnetic field generated by a busbar when a current to be measured flows, an insertion hole into which the busbar is insertable, and a main body accommodating the magnetic sensor. The main body includes a stopper portion configured to engage the busbar inserted into the insertion hole at a predetermined position in a Y direction, which is a longitudinal direction of the busbar, and a crush rib configured to fit tightly with a first protruding portion protruding from a plate surface of the busbar, in a state in which a second protruding portion of the busbar engages with the stopper portion. The occurrence of misalignment between the busbar and a magnetic detection element can be suppressed.