Rotating Piece Balancing With Magnetic Brakes and Eccentric Masses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing balancing devices for rotating machinery are complex, prone to wear, and difficult to miniaturize, making them unsuitable for high-speed applications like grinding wheels for internal cavities, where they cannot support the forces and speeds involved without compromising machining quality.
Innovation Solution
A balancing device using magnetic brakes to move eccentric masses around a central axis, eliminating imbalances by adjusting the position of these masses via a magnetic field, which induces eddy currents to oppose movement and allow precise balancing without the need for complex motors or large mechanical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional motors and mechanical connections are used to move balancing masses, then the balancing device can effectively counteract unbalance forces, but the device becomes very complex and subject to wear
Solution Approach 1:
The patent replaces traditional motors and mechanical connections with a magnetic field-based system. Electromagnets mounted on the rotating piece interact with ferromagnetic masses to move them without physical contact, eliminating mechanical wear and reducing system complexity while maintaining balancing effectiveness.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the control system and the balancing masses. The electromagnets create magnetic fields that attract or repel ferromagnetic masses, enabling contactless movement and positioning of the masses to counteract unbalance forces.
2Measurement precision
If complex balancing systems are used, then balancing precision can be achieved, but the system cannot be miniaturized for small grinding wheels
Solution Approach 1:
By replacing bulky mechanical motors with compact electromagnets and ferromagnetic masses, the system achieves high precision balancing in a miniaturized form factor suitable for small grinding wheels for internal cavities.
Solution Approach 2:
The balancing system is segmented into independent electromagnet-mass pairs that can be distributed around the rotating piece. This allows precise local control of mass positions while keeping each component small, enabling miniaturization without sacrificing precision.
3Reliability
If traditional balancing devices are used on high-speed rotating pieces, then unbalance can be corrected, but the devices are very subject to wear from constant revision
Solution Approach 1:
The patent eliminates mechanical contact between the balancing mechanism and rotating piece by using magnetic fields. Electromagnets mounted on the rotating piece interact with ferromagnetic masses without physical connection, eliminating wear and extending device lifespan while maintaining high-speed operation capability.
Solution Approach 2:
The system uses the rotating piece's own magnetic field (generated by electromagnets) to move and position the ferromagnetic masses, making the rotating piece itself part of the balancing mechanism. This self-contained approach reduces external mechanical connections and wear points.
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 provides a simple, robust, and cost-effective balancing mechanism capable of handling high-speed applications, ensuring precise balancing and extending the lifespan of machinery by reducing wear and complexity, making it suitable for small-scale grinding wheels and other high-speed tools.
Implementation Method 1
The magnetic brake 40 preferably comprises at least one conductive portion 41, made of conductive material, and at least one magnetic portion 42 capable of creating a magnetic field acting on the conductive portion 41
Implementation Method 2
The variable magnetic field generates the circulation of electrons in the conductor, in accordance with Faraday's law
Implementation Method 3
These electrons, therefore this moving electric current, in turn generate a magnetic field in the opposite direction to the variation of the applied magnetic field which opposes said reciprocal movement between the magnetic field and the conductor
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
It is provided a balancing device (1) for each rotating piece (10), the rotating piece (10) defining an axis of rotation (10a), the balancing device (1) comprising: a fixed portion (2), a mobile portion (3) defining a central axis (3a), being constrained to the rotating piece (10) so that the central axis (3a) substantially coincides with the rotation axis (10a), and comprising at least one eccentric mass (30), rotatable around the central axis (3a) and not balanced with respect to the central axis (3a), the balancing device (1) further comprising movement means (4) the eccentric masses (30), comprising a magnetic brake (40) and being able to rotate the eccentric masses (30), with respect to the rotating piece (10) around the central axis (3a).