Refrigerator compressor system and use
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Solution Overview
Problem
Existing ultra-low temperature refrigeration systems face inefficiencies in energy consumption, mechanical issues, and complexity due to constant compressor operation and voltage adaptation challenges, particularly in varying mains voltage and frequency environments.
Innovation Solution
A control device for a two-phase AC asynchronous motor compressor system using voltage converters to adapt to different input voltages and frequencies, with temperature sensors to adjust motor supply voltage, reducing energy consumption and avoiding excessive current, by activating motors only as needed and reducing voltage after temperature threshold is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If motors are switched on and off for load reduction after reaching target temperature, then energy consumption is reduced, but mechanical problems and vibration increase
Solution Approach 1:
The patent applies dynamic voltage control to the compressor motor during steady-state operation. Instead of switching motors on and off, the system continuously adjusts the supply voltage below nominal levels while maintaining constant motor speed, thereby reducing energy consumption without causing mechanical stress or vibration associated with frequent switching.
2Use of energy by moving object
If variable speed control is implemented for load reduction, then energy efficiency is improved, but control and motor complexity increases
Solution Approach 1:
The patent changes the voltage parameter of the motor supply while maintaining constant frequency and speed. By adjusting only the voltage level below nominal values during steady-state operation, the system achieves energy efficiency improvements without requiring complex variable speed control mechanisms, frequency converters, or additional sensors.
3Productivity
If compressor motors are designed for maximum load, then cooling performance is improved, but energy consumption during steady-state operation increases
Solution Approach 1:
The patent applies partial action by supplying the compressor motor with voltage below nominal levels during steady-state operation. The motor operates at reduced voltage (and thus reduced power) while maintaining sufficient cooling performance and constant speed, avoiding the excessive energy consumption that would result from continuous maximum load operation.
4Power
If frequent motor switching is used for load adaptation, then power consumption is reduced, but vibration and noise generation increase
Solution Approach 1:
The patent implements dynamic voltage adjustment during steady-state operation to reduce power consumption. By continuously controlling the voltage level below nominal values while maintaining constant motor speed and continuous operation, the system avoids the vibration and noise generated by frequent motor switching and startup/stopping cycles.
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 solution achieves significant energy savings (up to 15% over extended periods) and universal compatibility with various mains voltage environments without complex speed control or additional sensors, ensuring efficient operation and reduced mechanical stress.
Implementation Method 1
a first voltage converter 14, 16-1, 16-2 for supplying the at least one two-phase AC asynchronous motor K1, K2 with an AC voltage as output signal
Implementation Method 2
a refrigeration compressor system with a control device for a refrigeration compressor comprising at least one two-phase AC asynchronous motor
Implementation Method 3
Such refrigeration units, typically used for industrial or research purposes, can maintain a usable cooling range at a temperature below -40°C, typically even below -60°C down to -80°C and below
Data Source
Figure 1~2
AI summary
The invention relates to a control apparatus for a refrigerator compressor having at least one two-phase AC asynchronous motor (K1, K2), having mains connection means (10) for connection to a preferably public voltage supply network which nominally provides a mains AC voltage of between 85 V and 264 V, in particular between 100 V and 230 V, first voltage converter means (14) which are connected downstream of the mains connection means and are intended to generate an intermediate voltage, in particular an intermediate DC voltage, from the mains AC voltage, second voltage converter means (16-1, 16-2) which are connected downstream of the first voltage converter means and are intended to generate an output signal which is independent of a level and a mains frequency of the mains AC voltage, in particular has a constant voltage and/or frequency in periods, and is intended to control the refrigerator compressor with an AC voltage of a plurality of differently predefinable voltage levels, wherein the mains connection means are assigned voltage detector means (12) for capturing the mains AC voltage, the detector output signal from which can be evaluated by the second voltage converter means or control means (24) assigned to the latter for the purpose of generating a mains-voltage-dependent maximum value for a current of the output signal.