Piston Compressor Vibration Compensation via Torque Synchronization
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Solution Overview
Problem
Piston-type compressors in transportation vehicles experience undesired rotational vibrations due to the mismatch between the torque produced by the driving motor and the load moment of the compressor, leading to increased vibration excitation, which existing solutions attempt to mitigate through flywheel masses that increase weight and material expenditure.
Innovation Solution
A method and apparatus that use a frequency converter to control a three-phase motor, synchronizing the torque with the load moment of the piston compressor, effectively reducing vibration excitation by compensating for the difference between motor torque and load moment, and optionally adjusting feed voltage and pulse width to smooth pulsating load moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flywheel masses are added between the motor and piston compressor to reduce vibration excitation, then vibration behavior is improved, but weight and material expenditure increase
Solution Approach 1:
The patent replaces the mechanical vibration reduction system (flywheel masses) with an electronic control system. The frequency converter electronically adjusts the motor torque to follow the load moment profile, eliminating the need for mechanical flywheels while achieving the same vibration reduction effect.
Solution Approach 2:
The patent changes the operational parameters of the motor by using a frequency converter to dynamically adjust the torque output. Instead of changing the physical structure (adding flywheels), the system modifies the torque parameter to match the load moment, thereby reducing vibration excitation without increasing weight.
2Object-affected harmful factors
If flywheel masses are added between the motor and piston compressor to reduce vibration excitation, then vibration behavior is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical vibration reduction system (flywheel masses) with an electronic control system. The frequency converter electronically adjusts the motor torque to follow the load moment profile, eliminating the need for mechanical flywheels while achieving the same vibration reduction effect.
3Object-affected harmful factors
If the motor torque follows the load moment of the piston compressor, then vibration excitation is reduced, but control precision requirements increase
Solution Approach 1:
The patent implements a feedback control mechanism where the frequency converter continuously monitors the load moment of the piston compressor and adjusts the motor torque accordingly. This closed-loop control ensures that the motor torque follows the load moment profile accurately, reducing vibration excitation while managing control precision requirements through systematic feedback.
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 achieves up to 70% improvement in vibration behavior reduction, particularly at low rotational speeds, by minimizing vibration displacements and eliminating first-order vibration excitations, without the need for additional flywheel masses, thus optimizing compressor operation.
Implementation Method 1
a three-phase motor or the like controlled by a frequency converter
Implementation Method 2
the current position of the crankshaft of the piston compressor is determined
Data Source
AI summary
The invention relates to a method and to an apparatus for vibration compensation in a piston compressor, the piston compressor of which is driven by means of a crankshaft by a three-phase motor controlled by a frequency converter, wherein the current position the crankshaft of the piston compressor is determined, and based on this the frequency converter, a torque (MM) for the three-phase motor is predetermined, which torque follows the load torque (ML) of the piston compressor in order to reduce the vibration stimulation of the entire piston compressor.