Compressor and method for controlling the same
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Solution Overview
Problem
Compressors in refrigerators without a controller or cycle matching function face challenges in controlling the driving cycle of linear motors, making it difficult to apply general compressors and maintain efficient cooling capacity.
Innovation Solution
A compressor system with a compressor controller that detects motor current and voltage, calculates a phase difference, and adjusts the driving frequency and power to optimize the cooling capacity based on detected load changes, allowing for independent control of the linear motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a general compressor is applied to a refrigerator without a controller or cycle matching function, then the compressor structure remains simple and cost-effective, but the driving cycle control of the linear motor becomes difficult and cooling efficiency deteriorates
Solution Approach 1:
The compressor controller independently detects motor current, calculates phase difference, and determines load conditions without requiring external refrigerator controller intervention. The system self-regulates the linear motor driving cycle by comparing phase difference against reference values and adjusting power input accordingly, enabling autonomous operation in refrigerators without cycle matching functions.
Solution Approach 2:
The controller continuously monitors motor current, calculates phase difference between current and voltage, and uses this feedback to determine load conditions. Based on the phase difference comparison with reference phase difference, the controller adjusts the driving cycle parameters to optimize cooling efficiency under varying load conditions.
2Productivity
If the compressor controller independently detects load and controls linear motor driving, then driving efficiency is optimized and unnecessary power input is prevented, but the device complexity increases
Solution Approach 1:
The controller replaces complex mechanical cycle matching mechanisms with electronic detection and control. By using electrical parameters (motor current, phase difference) to determine load conditions and control the linear motor, the system achieves precise efficiency optimization without requiring mechanical linkages or complex physical control structures.
Solution Approach 2:
The controller optimizes driving efficiency by dynamically changing electrical parameters including phase difference, motor current, and driving frequency. By adjusting these parameters based on detected load conditions, the system achieves efficient operation across varying conditions without adding mechanical complexity.
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 enables efficient and stable operation of the compressor even without a controller, optimizing driving efficiency and preventing unnecessary power input, thus enhancing user convenience and system stability.
Implementation Method 1
a linear motor configured to provide a driving force to move the piston
Data Source
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.