Linear Motor Compressor Self-Adjusting Phase Difference Control
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Solution Overview
Problem
Compressors in refrigerators without a cycle matching function or controller face challenges in controlling the driving of linear motors, leading to inefficiencies and difficulties in varying cooling capacity.
Innovation Solution
A compressor system with a built-in controller that senses motor current and calculates phase differences to adjust the stroke and power of the linear motor, allowing it to operate independently and maintain efficient driving based on detected load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a compressor is installed in a refrigerator without a controller or cycle matching function, then the refrigerator can be manufactured at lower cost, but the compressor cannot be properly controlled and its driving efficiency cannot be optimized
Solution Approach 1:
The compressor controller performs self-diagnosis and self-adjustment by detecting motor current phase differences. It automatically determines load conditions and adjusts driving parameters without requiring external controller intervention, enabling the compressor to optimize its own driving efficiency independently.
Solution Approach 2:
The system uses feedback from motor current phase difference detection to continuously monitor and adjust compressor operation. By measuring the phase difference between motor current and stroke position, the controller receives real-time feedback on compressor load and performance, enabling automatic optimization of driving parameters.
2Productivity
If a compressor uses a built-in controller to detect load and control driving independently, then driving efficiency is optimized, but the device complexity increases
Solution Approach 1:
The compressor controller performs multiple functions using a single integrated unit: it detects motor current, calculates phase differences, determines load conditions, and adjusts driving parameters. This multi-functional design consolidates what could be separate complex subsystems into one unified controller.
Solution Approach 2:
The system replaces complex mechanical control mechanisms with electrical sensing and electronic control. By using motor current phase difference detection instead of mechanical sensors or complex mechanical feedback systems, the controller achieves intelligent control with simpler physical components.
3Adaptability or versatility
If the compressor controller detects load information separately from the refrigerator controller, then the compressor can operate independently, but the system requires additional sensing and control capabilities
Solution Approach 1:
The motor current serves as an intermediary that carries information about compressor load. By analyzing the phase difference in motor current, the controller indirectly measures load conditions without requiring direct mechanical or thermal sensors, simplifying the detection process while enabling independent operation.
Solution Approach 2:
The system monitors changes in motor current phase difference as a parameter that directly reflects load conditions. By tracking this electrical parameter variation, the controller can determine load state and adjust operation without complex multi-parameter sensing systems.
Data Source
Figure 1A~1B
Figure 2
Figure 3A
AI summary
Disclosed are a compressor applied to a refrigerator not having a cycle matching function or a refrigerator not including a controller, and capable of controlling a driving of a linear motor by the compressor itself, and a method for controlling the same. The compressor installed at an apparatus including a refrigeration cycle includes: a piston which reciprocates in a cylinder; a linear motor configured to provide a driving force to move the piston; a sensor configured to sense a motor current of the linear motor; and a compressor controller configured to detect information related to a load of the apparatus, in a separated manner from a controller which controls a body of the apparatus, wherein the compressor controller calculates a phase difference between a stroke of the piston and the sensed motor current, and wherein the compressor controller controls a driving of the linear motor in correspondence to the detected load, such that the calculated phase difference is within a range of a reference phase difference.