Electric Machine Electrodynamic Compensation for Tilting Stability
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Solution Overview
Problem
Existing electrical machines with magnetic bearings face challenges in tilting stability due to weak damping of magnetically stabilized degrees of freedom, leading to precession and nutation movements, and require additional magnetic fields for compensation, increasing installation space and manufacturing costs.
Innovation Solution
The use of an electrodynamic compensation means utilizing the excitation magnetic field without concatenation, where the conductor loop is designed to interact with the excitation magnetic field only when the axis of rotation tilts, eliminating additional magnetic fields and ohmic losses, and using a structurally simple, compact design with multiple windings and ferromagnetic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If passive magnetic bearings are used to reduce installation space and manufacturing costs, then installation space and costs are reduced, but damping of precession and nutation movements becomes weak leading to tilting resonances
Solution Approach 1:
The patent combines the excitation magnetic field (already present for motor operation) with the magnetic bearing function, merging two functions into one system. This eliminates the need for separate active magnetic bearing components while providing both support and damping functions through the interaction of the excitation field with conductor loops on the rotor.
Solution Approach 2:
The excitation magnetic field serves multiple functions: it generates torque for motor operation and simultaneously provides damping for precession and nutation suppression. The conductor loops on the rotor interact with this multi-functional field to provide passive damping without requiring additional active control systems.
2Reliability
If active magnetic bearings are used to improve damping of precession and nutation, then damping performance is improved, but installation space and manufacturing costs increase
Solution Approach 1:
The patent combines the excitation magnetic field (already present for motor operation) with the magnetic bearing function, merging two functions into one system. This eliminates the need for separate active magnetic bearing components while providing both support and damping functions through the interaction of the excitation field with conductor loops on the rotor.
Solution Approach 2:
The system uses the excitation magnetic field that is already necessary for motor operation to simultaneously provide bearing and damping functions. The conductor loops on the rotor automatically interact with the excitation field to generate damping forces without requiring external control systems or additional energy input.
3Reliability
If additional magnetic field-generating means are added to counteract tilting, then tilting compensation is improved, but installation space and production costs increase
Solution Approach 1:
The excitation magnetic field serves multiple functions: it generates torque for motor operation and simultaneously provides damping for precession and nutation suppression. The conductor loops on the rotor interact with this multi-functional field to provide passive damping without requiring additional active control systems.
Solution Approach 2:
The system uses the excitation magnetic field that is already necessary for motor operation to simultaneously provide bearing and damping functions. The conductor loops on the rotor automatically interact with the excitation field to generate damping forces without requiring external control systems or additional energy input.
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 approach effectively counteracts tilting without additional magnetic fields, reducing production costs and installation space, enhancing the stability and reliability of the electrical machine by leveraging the excitation magnetic field for electrodynamic effects.
Implementation Method 1
compensation means based on electrodynamic effects resulting from the interaction of electrical conductor loops, magnetic fields and their relative movement to one another
Implementation Method 2
passive magnetic bearings with permanent magnets in an attractive or repulsive arrangement
Data Source
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AI summary
An electric machine (100, 101, 102, 103) is shown, with bearing means for the magnetic support of at least one body (2) rotatable about an axis of rotation (4) relative to at least one non-rotatable body (1), wherein at least one rotatable body (2) has at least one means (13) to provide the excitation magnetic field (12) of the electric machine (100, 101, 102, 103), with at least one winding (10) which interacts with the excitation magnetic field (12) to generate a torque about the axis of rotation (4) and/or a load-bearing force for magnetic support.To make the electrical machine more reliable, it is proposed that the electrical machine (100, 101, 102, 103) additionally has at least one compensation means (16) with at least one electrical conductor loop (3, 7, 8, 9) separate from the winding (10), which on the one hand is unlinked with the excitation magnetic field (12) in a reference position (70) of the rotation axis (4) and on the other hand is linked with the excitation magnetic field (12) in at least one actual position (80) of the rotation axis (4) tilted relative to the reference position (70) in order to counteract the tilting (20).