Stirring Device Vibration Detection and Motor Control
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Solution Overview
Problem
Laboratory stirrers with long shafts often experience vibrations and imbalances, which can lead to damage, especially when immersed in glass jars, due to manufacturing tolerances and material properties, posing a risk of destruction.
Innovation Solution
Incorporating a vibration sensor, such as an acceleration sensor, connected to the drive motor's control circuit, which can alert the user and adjust or stop the motor to prevent damage from imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a long shaft is used for the stirring tool, then the stirring device can reach deeper into glass jars and stir larger volumes, but vibrations and imbalances occur more frequently leading to potential damage
Solution Approach 1:
The patent applies preliminary action by detecting vibrations and imbalances before they cause damage. The sensor system continuously monitors the stirring shaft during operation and triggers warnings or shutdowns proactively, preventing catastrophic failures of the glass jar or stirring tool before they occur.
2Ease of manufacture
If manufacturing tolerances are relaxed to reduce costs, then production becomes easier and cheaper, but vibrations and imbalances increase due to higher variability in shaft and stirring tool dimensions
Solution Approach 1:
The patent implements feedback by using sensors to detect vibrations and imbalances generated by the stirring tool and shaft. This feedback loop allows the system to monitor the actual performance, identify when manufacturing tolerances result in problematic variations, and respond by warning the user or shutting down to prevent damage.
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 solution effectively detects and mitigates vibrations and imbalances in real-time, preventing potential damage to the stirring device and its surroundings.
Implementation Method 1
the sensor that responds to imbalance is an acceleration sensor
Implementation Method 2
An expedient embodiment of the sensor in particular can provide for it to be piezo-based
Implementation Method 3
inductive with a plunger coil
Implementation Method 4
by means of strain gauges
Data Source
Figure 1~4
AI summary
The invention relates to a stirring device (1) that comprises a stirring tool which can be introduced into a mass or liquid that is to be stirred, a drive motor (4) that drives said stirring tool, a housing (5) enclosing said drive motor (4) and a fastening point (6) for securing said stirring device in a working position. The stirring device (1) has at least one sensor (11) for detecting imbalances which preferably is linked or connected to the open- and closed-loop control systems of the drive motor (4), and which can switch off said drive motor (4) or change the speed thereof in the event of undesired or dangerous oscillations or vibrations.