Compressor and refrigeration device
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Solution Overview
Problem
Existing compressor designs for refrigeration devices often result in low comprehensive efficiency and a small expansion range due to inadequate motor parameter design, leading to poor user experience.
Innovation Solution
A compressor with a permanent magnet motor connected to a frequency converter, where the critical rotation speed and pole number are optimized to ensure high efficiency in both star and angle connections, allowing for smoother switching between connections and improved performance across the entire frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor parameters are not properly designed, then the device complexity is reduced, but the comprehensive efficiency of the motor decreases and the expansion range becomes small
Solution Approach 1:
The patent applies parameter changes by optimizing specific motor parameters including the no-load back-EMF coefficient E0, direct axis inductance Ld, and critical rotation speed n0. These parameters are carefully selected to satisfy specific mathematical relationships that enable the motor to maintain high efficiency across different operating conditions and winding configurations.
Solution Approach 2:
The patent implements dynamics through winding switching between star and triangle connections based on rotation speed. The motor transitions between different winding configurations depending on whether the rotation speed is below or above the critical speed n0, allowing the motor to adapt its characteristics to different operating ranges and maintain optimal efficiency.
2Ease of manufacture
If the motor parameters are not properly designed, then the manufacturing process is simplified, but the expansion range of the motor becomes small
Solution Approach 1:
The patent uses parameter changes to expand the motor's operational range by optimizing E0, Ld, and n0 to satisfy specific relationships. These parameter adjustments enable the motor to effectively operate across a broader spectrum of speeds and loads without complicating the fundamental manufacturing process.
Solution Approach 2:
The dynamic winding switching capability expands the motor's adaptability by allowing it to operate efficiently in both low-speed (star connection) and high-speed (triangle connection) ranges, effectively doubling its practical expansion range compared to a fixed-configuration motor.
3Speed
If the winding connection is switched between star and triangle, then the speed range is expanded, but the switching impact affects performance stability
Solution Approach 1:
The patent implements dynamic winding switching based on rotation speed thresholds. The motor automatically transitions between star and triangle connections depending on whether the speed is below or above the critical value n0, enabling efficient operation across a wide speed range while maintaining stability within each operating mode.
Solution Approach 2:
The patent uses carefully designed parameter relationships, particularly the critical rotation speed n0 and the inequality (E0-P×I1×Ld)×n1≥0.6 Udc, to ensure smooth transitions between winding configurations. These parameter optimizations minimize switching impacts and maintain performance stability during transitions.
4Speed
If the critical rotation speed n0 is increased, then the high-speed performance is improved, but the low-speed efficiency in star connection may decrease
Solution Approach 1:
The patent applies parameter changes by setting the critical rotation speed n0≥40 r/s and optimizing the relationship between E0, Ld, n0, and other parameters. This coordinated parameter design ensures that when switching to triangle connection at higher speeds, the motor maintains high efficiency, while the star connection remains efficient at lower speeds due to the optimized parameter relationships.
Solution Approach 2:
The dynamic switching strategy resolves this contradiction by operating in star connection at low speeds (below n0) where it is most efficient, and switching to triangle connection at high speeds (above n0) where it provides superior performance. The critical speed n0 serves as an optimized transition point that balances both low-speed and high-speed efficiency requirements.
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 enhances the compressor's efficiency and performance by maintaining high efficiency at low and high speeds, reducing the impact of connection switching, and improving energy efficiency and market competitiveness.
Implementation Method 1
a permanent magnet motor being set in the first shell and connected to the other end of the coupling assembly
Data Source
AI summary
This present disclosure provides a compressor and a refrigeration device having the compressor. The refrigeration device has a coupling assembly and a frequency converter connected to one end of the coupling assembly. The compressor has a first shell and a permanent magnet motor. The permanent magnet motor is set in the first shell and connected to the other end of the coupling assembly. By designing the relevant parameters of the motor of the compressor, the efficiency of the motor and the compressor can be improved.