Destructive Interference for Vibration Control in Electrical Machines
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Solution Overview
Problem
Electrical machines, such as generators and motors, experience high-frequency vibrations and noise due to Maxwell forces in air gaps, which existing noise reduction techniques fail to address effectively, particularly in terms of forced vibrations.
Innovation Solution
An electrical machine device comprising a converter electrically coupled to the machine, where the configuration of both generates vibration components that interfere destructively, specifically matching frequencies and phases to reduce noise levels by canceling out main vibration components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If PWM switching frequency is chosen to avoid resonance, then magnetic noise is reduced, but forced vibrations are not addressed
Solution Approach 1:
The patent applies preliminary anti-action by intentionally generating a counter-vibration component from the converter that opposes and cancels the forced vibration component from the electrical machine. The control unit is configured to generate a counter-vibration component with opposite phase and adjusted amplitude to achieve destructive interference, thereby reducing the total vibration and noise before they propagate through the system structure.
2Object-affected harmful factors
If converter generates vibration component to cancel machine vibration, then noise is reduced, but system complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls the converter for its primary power conversion function, generates the counter-vibration component, and adjusts its amplitude and phase. By integrating these functions into a single control unit, the patent avoids adding separate dedicated devices for vibration cancellation, thereby reducing overall system complexity while achieving noise reduction.
3Object-generated harmful factors
If destructive interference is achieved between vibration components, then vibration is reduced, but precise frequency and phase matching is required
Solution Approach 1:
The patent employs feedback mechanisms where the control unit continuously monitors the vibration components and dynamically adjusts the amplitude and phase of the counter-vibration component generated by the converter. This feedback control ensures precise frequency and phase matching is maintained even under varying operating conditions, achieving effective destructive interference without requiring extreme manufacturing precision.
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 reduces noise levels and vibrations by at least 20%, providing improved acoustic comfort and minimizing material fatigue through destructive interference between the machine's and converter's vibration components.
Implementation Method 1
the first vibration component and the second vibration component at least partially interfere destructively
Data Source
AI summary
An electrical machine device is disclosed, the electrical machine device including an electrical machine and a converter electrically coupled to the electrical machine. A configuration of the electrical machine generates a first vibration component in the electrical machine and the converter generates a second vibration component in the electrical machine. The electrical machine and the converter are adapted to each other such that the first vibration component and the second vibration component at least partially interfere destructively. Further, respective methods and computer programs for controlling a converter or operating a converter are disclosed.