Motor Control Device Adaptive Compensation for Torque Ripple
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Solution Overview
Problem
Conventional motor control techniques face a trade-off in reducing both low-order and high-order noise, making it difficult to simultaneously minimize torque ripple and operational noise in motor systems.
Innovation Solution
A motor control device that includes an inverter and a control calculator, which calculates current and voltage command values based on actual angular velocity and target current command values, using adaptive control and compensation calculations to reduce torque ripple and noise by adding compensation values to the current or voltage command values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control with current command value is used, then motor control precision is improved, but torque ripple and operational noise increase
Solution Approach 1:
The patent converts the harmful torque ripple and noise generated by conventional feedback control into a compensatable signal by detecting the actual current and calculating the difference from the command value, then using this error signal to generate compensation currents that actively cancel out the torque ripple and operational noise while maintaining control precision
Data Source
AI summary
A motor control device includes an inverter to drive a motor, and a control calculator to calculate a current command value indicating a current to be supplied to the motor from the inverter. The control calculator includes a voltage control calculator to calculate a voltage command value indicating a voltage to be applied to the motor from the inverter based on a current deviation between the current command value and the actual current detection value, and a compensation calculator to add a compensation value to a signal value on at least one of an upstream side and a downstream side in a signal flow that passes through the voltage control calculator. The voltage control calculator calculates the voltage command value by adaptive control based on an actual angular velocity value indicating an angular velocity at which the motor rotates. The compensation calculator calculates the compensation value based on the actual angular velocity value and the target current command value.