Electric Media-Flow Machine Rotor Deposit Removal via Periodic Winding De-Energization
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Solution Overview
Problem
Ferromagnetic particle deposits on the rotor or inner sleeve of electric media-flow machines in turbochargers cause turbulence and reduced airflow efficiency, as existing technologies lack effective methods to prevent or remove these deposits without requiring retrofitting.
Innovation Solution
Generating an opposing magnetic field, either constant or pulsating, relative to the rotor's magnetic field to cancel the holding force of deposited particles, ensuring they detach and are not attracted to the rotor or inner sleeve, using a control unit to manage the drive winding and adjust the opposing field strength based on airflow and rotor position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive winding is continuously energized to maintain rotor rotation, then the media-flow machine can overcome startup inertia and operate reliably, but ferromagnetic particles are continuously attracted to the rotor and inner sleeve, forming deposits that reduce airflow efficiency
Solution Approach 1:
The drive winding is energized periodically rather than continuously. During operation, the winding is energized for a predetermined time period to generate rotor rotation, then de-energized to allow ferromagnetic particles to fall away due to gravity. This periodic cycling prevents deposit accumulation while maintaining the ability to overcome startup inertia and sustain operation.
2Stability of the object's composition
If ferromagnetic particle deposits are allowed to accumulate on the rotor and inner sleeve, then the magnetic holding force maintains particle separation, but turbulence increases and airflow efficiency decreases
Solution Approach 1:
The system alternates between energizing the drive winding to maintain particle separation through magnetic holding force, and de-energizing it to allow particles to detach and fall away. This periodic action prevents the accumulation of deposits that would otherwise create turbulence and reduce airflow efficiency.
3Stability of the object's composition
If the media-flow machine operates without periodic de-energization, then continuous particle separation is maintained, but the machine requires physical modifications and retrofitting to prevent deposits
Solution Approach 1:
The control parameter of the drive winding energization is changed from continuous to periodic. By controlling the timing and duration of energization cycles, the system achieves both particle separation and deposit prevention without requiring any physical modifications to the media-flow machine structure, making it easy to manufacture and implement.
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
Prevents the formation and removal of ferromagnetic particle deposits, maintaining airflow efficiency and extending the operational life of media-flow machines without the need for physical modifications, allowing for easy integration through software upgrades.
Implementation Method 1
the drive winding of the stator is driven at least intermittently in such a way that it generates an opposing field rectified relative to a magnetic field of the rotor
Implementation Method 2
Due to the rectified opposing field, the holding force of deposited ferromagnetic particles is canceled at least locally, whereby particles already deposited on the rotor detach from it
Data Source
AI summary
A method is described for operating an electric media-flow machine for a compressor and/or a turbine, especially for an exhaust-gas turbocharger of an internal combustion engine, having a shaft rotationally mounted in a housing that has an inlet and an outlet for a medium to be conveyed, a rotor being disposed in rotatably fixed manner on the shaft, having a stator that is fixed in the housing and has at least one polyphase drive winding as well as a plurality of stator teeth projecting radially to the inside, having a covering cap that covers the rotor upstream and to which an inner sleeve is joined surrounding the rotor circumferentially. An outer sleeve is disposed coaxially relative to the inner sleeve, the inner sleeve and the outer sleeve being fixed in the housing, and the stator teeth extending through the outer sleeve at least up to the inner sleeve.