Compressor Motor Preheating Control for Lower Power Use
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Solution Overview
Problem
Conventional motor driving apparatuses for compressors consume excessive power during preheating due to constant current application regardless of compressor temperature, leading to inefficient energy usage.
Innovation Solution
A motor driving apparatus equipped with a temperature sensing unit, an inverter, and a controller that adjusts the duration and level of motor preheating current based on sensed compressor temperature, reducing power consumption by increasing current application time or level as temperature decreases and decreasing it as temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant current is applied for motor preheating regardless of compressor temperature, then the motor preheating function is ensured, but power consumption increases excessively
Solution Approach 1:
The patent applies dynamics principle by transitioning from constant current preheating to variable current preheating. The controller dynamically adjusts the preheating current magnitude based on real-time compressor temperature feedback, making the preheating process adaptive rather than static. This resolves the contradiction by maintaining preheating effectiveness while optimizing energy consumption according to actual temperature conditions.
Solution Approach 2:
The patent implements parameter changes by modifying the preheating current parameter based on temperature conditions. When compressor temperature is low, higher current is applied; when temperature is already elevated, lower current or extended timing is used. This parameter adjustment strategy maintains reliable preheating while significantly reducing unnecessary power consumption during warm conditions.
2Reliability
If preheating current application time is extended to ensure adequate preheating, then motor preheating effectiveness is improved, but energy waste increases
Solution Approach 1:
The patent applies feedback principle by continuously monitoring compressor temperature during the preheating period and using this information to adjust preheating current magnitude and timing. The temperature sensor provides real-time feedback to the controller, which modulates the preheating parameters accordingly. This feedback mechanism ensures adequate preheating effectiveness while preventing energy waste by stopping or reducing current when temperature targets are achieved.
Solution Approach 2:
The patent implements periodic action through multi-stage preheating with pauses. Instead of continuous constant current application, the system uses intermittent preheating cycles with varying current levels and timing intervals. This periodic approach maintains preheating effectiveness while reducing cumulative energy consumption compared to continuous preheating.
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 reduces power consumption during compressor preheating by dynamically adjusting the preheating current in response to temperature changes, enhancing energy efficiency.
Implementation Method 1
an inverter including a plurality of switching elements to convert a direct current (DC) voltage into an alternating current (AC) voltage by switching operation of the switching elements
Implementation Method 2
apply motor preheating current for preheating of the motor during a first period before startup of the motor
Data Source
AI summary
A motor driving apparatus and a home appliance including the same. The motor driving apparatus includes a temperature sensing unit to sense a compressor temperature, an inverter including a plurality of switching elements to convert a direct current (DC) voltage into an alternating current (AC) voltage and to supply AC voltage to a motor used to drive the compressor, and a controller to control the inverter. The controller performs control to apply motor preheating current for preheating of the motor during a first period before startup of the motor, and varies depending on the sensed temperature a time during which the motor preheating current is applied or a current application level. A reduction in power consumption during the preheating of the compressor is achieved.