Linear Compressor Capacity Modulation Without Voltage Shocks
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Solution Overview
Problem
Conventional linear compressors face reliability issues due to continuous voltage modulations for cooling capacity control, leading to power shocks and increased complexity, and they often require multiple controls for voltage adjustments, which complicates the cooling process and reduces component reliability.
Innovation Solution
A linear compressor design that performs natural cooling capacity modulation based on load changes and selectively uses power control for forcible modulation, utilizing a motor control unit that maintains constant voltage and frequency, and senses voltage rather than current to accurately control counter EMF, thereby simplifying the cooling process and reducing power shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuous voltage modulations are performed for cooling capacity control, then cooling capacity adjustment is achieved, but component reliability deteriorates due to power shocks
Solution Approach 1:
The patent applies periodic action by using natural cooling capacity modulation through reciprocation of the movable member instead of continuous voltage modulation. The system leverages the periodic reciprocating motion of the compressor to achieve cooling capacity control, thereby avoiding continuous voltage changes that cause power shocks and reliability issues.
Solution Approach 2:
The patent replaces the electrical control system (voltage modulation) with a mechanical approach (natural cooling capacity modulation through reciprocation). By controlling the reciprocating motion parameters rather than continuously modulating voltage, the system achieves cooling capacity adjustment without the harmful effects of continuous electrical modulation.
2Measurement precision
If multiple controls are used for voltage adjustments, then cooling capacity control precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex multiple voltage control systems from the conventional design. Instead of using multiple controls for voltage adjustment, the invention relies on the natural cooling capacity modulation through reciprocation, thereby simplifying the control system while maintaining cooling capacity control precision.
Solution Approach 2:
The system utilizes the inherent reciprocating motion of the compressor to achieve natural cooling capacity modulation. This self-service approach eliminates the need for complex external control systems, as the reciprocation itself provides the necessary cooling capacity adjustment without requiring multiple control mechanisms.
3Measurement precision
If current sensing is used for control, then control accuracy is achieved, but power shocks occur during voltage modulations
Solution Approach 1:
The patent replaces current sensing and voltage modulation with mechanical reciprocation-based control. By controlling the reciprocating motion parameters instead of sensing current and modulating voltage, the system achieves control accuracy without generating power shocks during operation.
Solution Approach 2:
The patent converts the potential harm of voltage modulation and current sensing into benefit by using natural cooling capacity modulation through reciprocation. The system leverages the existing reciprocating motion to achieve control objectives without the harmful side effects of electrical modulation, effectively turning the mechanical operation into a beneficial control mechanism.
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
The solution enables stable and efficient cooling capacity modulation with reduced power shocks and component complexity, improving reliability by using voltage-based control and maintaining constant voltage and frequency, even with varying external power inputs.
Implementation Method 1
a motor control unit which performs a natural cooling capacity modulation according to a load by reciprocation of the movable member
Implementation Method 2
a motor unit which includes a motor and a capacitor connected in series to the motor so as to make the movable member linearly reciprocate
Implementation Method 3
one or more springs which are installed to elastically support the movable member in a motion direction of the movable member
Data Source
AI summary
The present invention relates to a linear compressor, and more particularly, to a linear compressor which supplies a necessary cooling capacity through a natural cooling capacity modulation and a forcible cooling capacity modulation, and a cooling system using the same. The linear compressor according to the present invention includes a compression space into which refrigerant is sucked, a movable member which linearly reciprocates to compress the refrigerant sucked into the compression space, one or more springs which are installed to elastically support the movable member in a motion direction of the movable member, a motor unit which includes a motor and a capacitor connected in series to the motor so as to make the movable member linearly reciprocate, and a motor control unit which performs a natural cooling capacity modulation according to a load by reciprocation of the movable member.