Rotary Machine Control Device for Vibration Suppression
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Solution Overview
Problem
Rotary electric machines with manufacturing errors leading to stator or rotor eccentricity or circularity deviations cause magnetic flux density variations during rotation, resulting in vibration and noise, which existing control methods fail to correct.
Innovation Solution
A multigroup, multiphase rotary electric machine control device that calculates and applies correction coefficients to current command values based on magnetic flux density variations, ensuring consistent magnetic flux density across phases and reducing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control methods are used, then the control system is simple, but magnetic flux density variation cannot be corrected and vibration and noise occur
Solution Approach 1:
The patent applies preliminary action by pre-calculating correction coefficients based on the spatial mode M of electromagnetic force before actual operation. The correction coefficient calculation unit computes these coefficients in advance to compensate for magnetic flux density variations caused by manufacturing errors, allowing the system to proactively correct issues before they manifest as vibration and noise during rotation.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting current command values based on calculated correction coefficients. The current command value correction unit modifies the initial current command values by applying group-specific correction coefficients, thereby changing the electrical parameters to compensate for magnetic flux density variations and eliminate vibration and noise without requiring physical modifications to the machine structure.
2Reliability
If manufacturing precision is improved to eliminate eccentricity, then magnetic flux density variation is reduced, but manufacturing cost and complexity increase
Solution Approach 1:
The patent applies mechanics substitution by replacing the need for high-precision mechanical manufacturing with an electrical control solution. Instead of requiring precise manufacturing to eliminate eccentricity and circularity deviations, the system uses calculation and correction of current command values based on detected spatial modes, substituting mechanical precision requirements with computational compensation methods.
Solution Approach 2:
The patent implements self-service by enabling the control system to automatically detect and correct its own performance issues. The correction coefficient calculation unit analyzes the spatial mode M of electromagnetic force and automatically generates correction coefficients that compensate for magnetic flux density variations, allowing the system to self-diagnose and self-correct vibration and noise problems without external intervention or manual adjustment.
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
The control device effectively corrects magnetic flux density variations due to eccentricity or circularity deviations, suppressing vibration and noise in rotary electric machines by adjusting current command values using calculated correction coefficients.
Implementation Method 1
magnetic flux density variation with respect to a rotational periodicity at the time of rotation of the multigroup, multiphase rotary electric machine
Implementation Method 2
spatial mode M (M is 0 or a positive integer) of an electromagnetic force caused by magnetic flux density variation
Data Source
AI summary
A multigroup, multiphase rotary electric machine control device including: a control target calculator to calculate an initial current command value of each phase based on a torque command value; a correction coefficient calculator to calculate a per-group correction coefficient corresponding to each group from a spatial mode M (M is 0 or a positive integer) of an electromagnetic force caused by magnetic flux density variation with respect to a rotational periodicity at the time of rotation of the multigroup, multiphase rotary electric machine; and a current command value corrector to calculate a current command value of the each phase, which is corrected based on the initial current command value and the per-group correction coefficient.