Motor Control Device Resonance Filter for Compressor Vibration
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Solution Overview
Problem
Motor control systems face challenges in managing periodic variations in load torque, leading to vibration and noise in compressors and other motor-driven devices, while also seeking to reduce power consumption.
Innovation Solution
A motor control device employing vector control with a resonance filter and torque current corrector to adjust the emphasis on periodic variations in load torque, minimizing vibration and noise, and optimizing power consumption by adjusting the gain of the resonance filter based on the variation range and amplitude of the torque current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If torque control is used to compensate for load torque variations, then vibration and noise are reduced, but power consumption increases
Solution Approach 1:
The patent changes the parameter of torque current by superimposing a resonance component at the specific frequency of load torque variations onto the basic torque current. This parameter modification allows targeted compensation of periodic load variations without continuously increasing torque control strength, thereby reducing vibration and noise while optimizing power consumption.
Solution Approach 2:
The patent applies periodic action by introducing a resonance filter that generates a torque current component at the specific frequency of load torque variations. This periodic torque component synchronizes with the load variations to actively counteract them, reducing vibration and noise through frequency-targeted control rather than continuous broad-spectrum torque adjustment.
2Object-affected harmful factors
If the degree of emphasis on torque variation component is increased, then vibration and noise reduction improves, but power consumption increases
Solution Approach 1:
The patent optimizes the degree of emphasis (gain) of the resonance filter to achieve the minimum necessary torque correction for reducing vibration and noise. By precisely tuning this parameter rather than applying maximum emphasis, the system reduces harmful vibrations while minimizing the energy loss associated with excessive torque control.
3Object-affected harmful factors
If resonance filter emphasis is adjusted to reduce vibration, then vibration and noise are reduced, but control system complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the resonance filter's output is superimposed on the basic torque current, and the gain of the resonance filter is adjusted based on the variation range of the torque current. This feedback-based adaptive control reduces vibration and noise while maintaining reasonable system complexity through automated parameter adjustment rather than complex manual tuning.
Data Source
AI summary
A motor control device performing vector control for a motor that drives a load whose load torque varies periodically. The motor control device has: a motor speed deriving portion estimating or detecting a motor speed; a speed controller producing a specified torque current value such that the motor speed is made to follow a specified motor speed value fed from outside; a resonance filter producing a corrected torque current value by receiving a control value that varies with variations in the load torque and emphasizing a periodic variation component of the control value; a torque current corrector producing a specified superimposed torque current value by superimposing the corrected torque current value on the specified torque current value; and an adjusting portion adjusting, based on the specified superimposed torque current value, a degree of emphasis placed on the variation component by the resonance filter. The vector control is performed according to the specified superimposed torque current value.