Compressor Control System for Friction Loss Reduction
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Solution Overview
Problem
Compressors in refrigerators face efficiency deterioration due to varying cooling power requirements, leading to mechanical resonance and friction losses, which affect their maximum efficiency across a wide range of temperatures.
Innovation Solution
A compressor control system that adjusts the AC voltage supplied to the motor, implementing quick turn-on and turn-off operations to utilize inertial and elastic energy, reducing friction loss and maintaining maximum efficiency by varying the ratio of motor turn-on and turn-off time periods based on command cooling power and maximum-efficiency operation values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the compressor operates continuously to provide wide range cooling power variations, then the cooling power adaptability is improved, but the operation efficiency deteriorates due to mechanical resonance and friction losses
Solution Approach 1:
The compressor operates in periodic cycles of operation and suspension rather than continuous operation. The control method suspends the compressor during low cooling power demand periods and resumes operation when demand increases, thereby reducing cumulative friction losses while maintaining adequate cooling power adaptation across different operating conditions
2Use of energy by moving object
If the compressor operates at high cooling power to maintain maximum efficiency, then the energy efficiency ratio is improved, but the adaptability to low cooling power requirements deteriorates
Solution Approach 1:
The control method dynamically adjusts the compressor operation by switching between continuous operation mode (for high cooling power demand) and periodic suspension mode (for low cooling power demand). This dynamic control strategy allows the system to maintain high energy efficiency ratio when operating continuously while also adapting to low cooling power requirements through strategic suspension periods
Solution Approach 2:
By implementing periodic suspension and resumption of compressor operation, the system can operate at optimal efficiency points during active periods while meeting low cooling power demands during suspension periods, thereby achieving both high energy efficiency ratio and wide adaptability to different cooling power requirements
3Power
If the motor operates continuously to meet cooling demand, then the cooling power output is improved, but the friction loss and noise increase
Solution Approach 1:
The control method implements periodic suspension of motor operation during low cooling power demand periods, which eliminates noise generation during these times while still meeting cooling demands during active operation periods. This periodic on-off operation reduces overall noise exposure while maintaining adequate cooling power output when needed
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 ensures the compressor operates with maximum efficiency across a wide range of cooling power variations, reducing friction loss and noise while improving the power factor and maintaining optimal performance.
Implementation Method 1
the piston reciprocates using inertial energy in a turn-off time section of the motor
Implementation Method 2
reducing friction loss and noise while improving the power factor
Data Source
AI summary
An apparatus and a method may control a compressor. The apparatus may control a motor (included in a compressor) such that the motor quickly repeats turn-on and turn-off operations in a cooling power supply time period/section, thereby enabling the compressor to compress refrigerant in the cooling power supply time period/section. Thus, cooling power of a refrigerator may change while the compressor operates with maximum efficiency.