Blood Pump Rotor Positioning via Non-Symmetrical Magnetization
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Solution Overview
Problem
Conventional implantable blood pumps with magnetic bearings face challenges in precisely setting the rotor position due to manufacturing tolerances of permanent magnets, leading to complex and wasteful processes.
Innovation Solution
A method for producing a bearing arrangement for implantable blood pumps involves driving the rotor in rotation and correcting its deflection through non-rotationally symmetrical application, removal, magnetization, or demagnetization of magnetically active material on the stator or rotor, allowing for precise positioning and balancing, thus reducing waste and simplifying production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If permanent magnets are used for the magnetic bearing, then the rotor position can be set, but the manufacturing tolerance of permanent magnets causes imprecision in rotor position
Solution Approach 1:
The patent applies preliminary action by determining the rotor position and magnetic properties during the production process itself, rather than relying solely on pre-manufactured permanent magnet tolerances. The rotor is driven in rotation during production, and its deflection is measured and corrected proactively, ensuring precise rotor position is achieved before the device leaves the factory.
Solution Approach 2:
The patent changes the magnetic properties of the stator and/or rotor by non-rotationally symmetrical application, removal, magnetization, and/or demagnetization of magnetically active material. This parameter change allows correction of rotor deflection and positioning errors that arise from permanent magnet manufacturing tolerances, achieving the desired rotor position precision.
2Manufacturing precision
If multiple permanent magnets are incorporated and tested to achieve desired magnetic properties, then rotor position precision is improved, but the production process becomes complex and waste increases
Solution Approach 1:
The patent extracts the correction function from the permanent magnets themselves and applies it separately through controlled application/removal of magnetically active material on the stator and/or rotor. This separation allows the permanent magnets to serve their primary function while the correction process independently adjusts magnetic properties, simplifying the overall production process.
Solution Approach 2:
Instead of selecting and swapping multiple permanent magnets to achieve desired properties, the patent changes the magnetic properties of existing components through controlled magnetization and demagnetization processes. This approach reduces production complexity by eliminating the need for extensive testing and swapping of permanent magnets.
3Ease of manufacture
If conventional production methods are used, then manufacturing is simpler, but rotor position cannot be precisely set leading to operational issues
Solution Approach 1:
The patent incorporates preliminary measurement and correction actions during the production process. The rotor is driven in rotation, its deflection is determined, and magnetic corrections are applied proactively. This ensures precise rotor position is achieved as part of normal production, maintaining production simplicity while improving precision.
Solution Approach 2:
The production process itself serves the dual purpose of manufacturing and precision adjustment. By driving the rotor during production and measuring its deflection, the system uses its own operation to identify and correct positioning errors, eliminating the need for separate complex adjustment procedures.
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 method enables the production of blood pumps with precisely set magnetic properties and rotor positions, resulting in smooth, durable, and energy-efficient operation with reduced material usage and simplified assembly, allowing for broader working ranges and minimizing the need for subsequent adjustments.
Implementation Method 1
The rotor is driven in rotation, in particular by generation of a flow of current in the stator windings
Implementation Method 2
the deflection of the rotor is corrected by non-rotationally symmetrical application, removal, magnetization and/or demagnetization of magnetically active material on the stator and/or on the rotor
Data Source
AI summary
A method is provided for producing a bearing arrangement for an implantable blood pump. A bearing arrangement and an implantable blood pump are also provided. In the method, a rotor may be provided having one or more drive magnets. The rotor has a conveying element. In addition, a stator having stator windings is provided. Furthermore, the rotor is arranged in a flow channel formed by an inside wall of the stator. A rotor rotation is then driven. While the rotor rotation is driven, a deflection of the rotor is determined. In addition, the deflection of the rotor may be corrected by applying, removing, magnetizing and/or demagnetizing magnetically active material on the stator and/or on the rotor in a non-rotationally symmetrical manner.