Harmonic Balancing Signals for Linear Motor Vibration
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Solution Overview
Problem
Existing vibration balancing technologies, both passive and active, are ineffective in canceling vibrations at harmonics of the fundamental operating frequency of a machine, and they often require additional mechanical structures or are costly.
Innovation Solution
A method that uses a digital processor to generate harmonic balancing signals by processing sensed vibration signals with an adaptive filter algorithm, which are then summed with the principal control signal to drive a linear motor/alternator, effectively canceling vibrations at harmonics of the operating frequency without additional mechanical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive vibration balancers are used, then cost is reduced, but they can only respond to vibrations at one resonant frequency and cannot balance harmonics
Solution Approach 1:
The patent replaces the mechanical passive balancer system with an electronic control system that uses adaptive filtering algorithms to generate balancing signals. This substitution allows the system to respond to multiple frequencies including harmonics without the physical constraints of mechanical resonant systems, resolving the contradiction between cost-effectiveness and frequency versatility.
Solution Approach 2:
The patent implements a dynamic control system that continuously adapts to varying vibration conditions through real-time signal processing. The adaptive filter dynamically adjusts its parameters to track and cancel vibrations at the fundamental frequency and its harmonics, providing the versatility needed to handle multiple frequencies while maintaining cost-effectiveness through software-based control rather than multiple mechanical balancers.
2Adaptability or versatility
If active vibration balancers are used, then frequency response capability is improved, but cost increases and additional mechanical structures are required
Solution Approach 1:
The patent replaces additional mechanical balancing structures with an electronic signal processing system. The adaptive filter algorithm processes vibration signals and generates balancing forces through the existing motor/alternator control system, eliminating the need for separate mechanical balancers while maintaining the ability to cancel vibrations at multiple frequencies including harmonics.
Solution Approach 2:
The patent makes the existing motor/alternator control system multi-functional by using it both for primary control and for vibration balancing. The same power stage and control infrastructure are used to generate both the principal control signal and the harmonic balancing signals, eliminating the need for separate dedicated balancing mechanisms and reducing overall system complexity.
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 minimizes vibrations at harmonics of the operating frequency, providing a more comprehensive solution than traditional methods by continuously adapting to sensed vibrations and applying compensating forces, thus reducing machine vibrations effectively.
Implementation Method 1
an electromagnetic linear motor or alternator
Implementation Method 2
A vibration balancer generates forces that oppose the vibration; that is, it generates forces that are equal or nearly equal in amplitude but opposite in phase to, and thereby cancel or nearly cancel, the forces produced by the vibration
Data Source
AI summary
Vibrations at harmonic frequencies are reduced by injecting harmonic balancing signals into the armature of a linear motor/alternator coupled to a Stirling machine. The vibrations are sensed to provide a signal representing the mechanical vibrations. A harmonic balancing signal is generated for selected harmonics of the operating frequency by processing the sensed vibration signal with adaptive filter algorithms of adaptive filters for each harmonic. Reference inputs for each harmonic are applied to the adaptive filter algorithms at the frequency of the selected harmonic. The harmonic balancing signals for all of the harmonics are summed with a principal control signal. The harmonic balancing signals modify the principal electrical drive voltage and drive the motor/alternator with a drive voltage component in opposition to the vibration at each harmonic.