Refrigerator Compressor Control Using Phase Currents for Piston Position

The patent replaces mechanical position detection systems with an electrical measurement approach. The measuring device determines piston position indirectly by measuring electrical phase currents of the three-phase synchronous motor and processing these signals to derive position information. This substitution eliminates complex mechanical sensors while achieving precise position detection through electrical signal analysis.

The patent introduces an intermediary measurement approach where electrical phase currents serve as the mediator between the motor operation and piston position. Instead of directly measuring mechanical position, the system measures electrical parameters (phase currents) and processes them to determine position, using the electrical domain as an intermediary to avoid direct mechanical measurement complexity.

The patent implements a feedback control system where the measured electrical phase currents are continuously processed to determine actual piston position. This position information feeds back to the control device, enabling real-time adjustment of compressor operation to optimize energy efficiency. The feedback loop ensures the compressor operates at optimal points by continuously monitoring and responding to actual piston position.

The patent replaces energy-intensive mechanical position sensing systems with an electrical measurement and processing approach. By using electrical phase current measurements and signal processing to determine position, the system achieves precise position detection with lower energy consumption compared to traditional mechanical sensors and actuators.

The patent replaces mechanical rotor position sensors with an electrical measurement system that determines angular position from phase currents. The three-phase synchronous motor's electrical parameters are measured and processed to derive rotor position information, substituting mechanical sensing with electrical signal analysis to achieve precise position detection without additional mechanical components.

The patent makes the motor's electrical system serve dual purposes: both driving the compressor and providing position detection. The same three-phase synchronous motor that drives the compressor also generates the electrical signals (phase currents) that are measured and processed to determine rotor position. This self-service approach eliminates the need for separate position sensing systems.

The patent implements feedback control where the control device receives actual speed and position information from the measuring device and adjusts motor operation accordingly. This feedback enables the compressor to operate at optimal points for maximum cooling efficiency, automatically adapting to changing conditions without manual intervention.

The patent performs preliminary determination of actual speed and position using the measuring device before making control adjustments. By continuously measuring and processing electrical phase currents to establish current operating conditions, the system prepares the necessary information in advance for optimal control decisions, enabling proactive optimization rather than reactive correction.