Motor Excitation Waveform Tuning for Vibration and Torque Ripple
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Solution Overview
Problem
Existing methods for suppressing motor vibrations in synchronous motors, such as those described in Non Patent Literature 1 and Patent Literature 1, are insufficient as they rely on pre-specified harmonic components that do not effectively reduce vibrations, particularly torque ripples and electromagnetic forces.
Innovation Solution
An excitation waveform determination device that sets and optimizes candidate solutions for excitation waveforms through electromagnetic field analysis, allowing for dynamic adjustment of harmonic superimposition on the fundamental wave to minimize vibrations and electromagnetic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a pre-specified harmonic component is superimposed on the fundamental wave current, then the torque ripple of a synchronous motor is reduced, but the vibration suppression is insufficient
Solution Approach 1:
The patent applies dynamics by making the harmonic order dynamic rather than fixed. The control device dynamically determines the optimal harmonic order based on real-time motor operating conditions (rotation frequency and torque), allowing the excitation waveform to adapt to changing conditions. This resolves the contradiction by enabling effective vibration suppression across varying operating points while maintaining torque ripple reduction.
Solution Approach 2:
The patent changes the parameter of harmonic order from a pre-specified fixed value to a dynamically adjustable parameter. By varying the harmonic order according to operating conditions, the system achieves both torque ripple reduction and effective vibration suppression. The control device calculates optimal harmonic orders based on electromagnetic force characteristics at different operating points.
2Force
If an excitation current with a specified harmonic order is used, then the electromagnetic force in the radial direction is reduced, but overall vibration suppression remains insufficient
Solution Approach 1:
The system dynamically adjusts the harmonic order based on operating conditions to simultaneously reduce radial electromagnetic force and suppress vibration. The control device determines optimal harmonic orders that address both concerns by analyzing electromagnetic force characteristics at different rotation frequencies and torque levels.
Solution Approach 2:
The patent changes the harmonic order parameter dynamically to achieve both reduction in radial electromagnetic force and suppression of motor vibration. By adjusting this parameter according to operating conditions, the system resolves the contradiction between force reduction and vibration suppression.
3Ease of manufacture
If the harmonic order is fixed based on theoretical or phenomenological consideration, then the excitation waveform is simple to generate, but it cannot sufficiently suppress motor vibration across different operating conditions
Solution Approach 1:
The system transitions from a static fixed harmonic order to a dynamic determination approach. The control device calculates optimal harmonic orders based on real-time operating conditions (rotation frequency and torque), maintaining ease of waveform generation through automated calculation while achieving effective vibration suppression across all operating points.
Solution Approach 2:
The system implements feedback by using detected rotation frequency and torque information to determine the optimal harmonic order. This feedback mechanism allows the excitation waveform to adapt to changing operating conditions, achieving effective vibration suppression while maintaining simple generation through automated control.
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
Effectively suppresses motor vibrations and electromagnetic forces by determining optimal excitation waveforms that balance noise reduction with torque output, enhancing motor performance.
Implementation Method 1
an electromagnetic field analyzing part configured to calculate an electromagnetic force generated in a stator of the motor when the one or more candidate solution included in the candidate solution group is supplied to the motor, through execution of an electromagnetic field analysis
Data Source
AI summary
An excitation waveform determination device (100) sets an initial candidate solution group (IS) and a new candidate solution group (US) as one or a plurality of candidate groups of an excitation waveform based on a harmonic superimposition condition (HC) being information that specifies a harmonic to be superimposed on a fundamental wave included in the excitation waveform, executes an electromagnetic field analysis to calculate respective electromagnetic forces generated in a stator (320) when making the candidate solutions included in the one or plurality of set candidate solution groups of the excitation waveform flow through a motor (M), and determines the excitation waveform based on a result of the execution of the electromagnetic field analysis.