Rotor Refrigerant Flow Path to Prevent Magnet Demagnetization
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Solution Overview
Problem
Conventional electric compressors experience performance degradation and operational loss due to temperature rise and demagnetization of the rotor's magnet, leading to decreased magnetic force.
Innovation Solution
The electric compressor design includes a refrigerant flow path through the rotor's balance weights, covers, and core, with strategically positioned refrigerant and fastening holes to cool the magnet, preventing temperature rise and demagnetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor operates continuously to drive the compression mechanism, then the compressor maintains high productivity, but the magnet temperature rises causing demagnetization and performance degradation
Solution Approach 1:
The patent introduces refrigerant as an intermediary cooling medium that flows through the rotor structure (core, covers, balance weights) to directly cool the magnet. This intermediary substance transfers heat away from the magnet during motor operation, preventing demagnetization while maintaining continuous operation capability
Solution Approach 2:
The patent utilizes the refrigerant fluid circulation system to cool the motor rotor. The refrigerant flows through dedicated passages in the core, covers, and balance weights, using fluid dynamics to remove heat from the magnet and prevent temperature-induced demagnetization during continuous operation
2Device complexity
If the rotor structure is simplified without cooling features, then the device complexity is reduced, but the magnet experiences temperature rise and demagnetization
Solution Approach 1:
The patent makes the rotor components (core, covers, balance weights) serve dual functions: maintaining rotor mechanical integrity and providing cooling pathways for the magnet. The existing structural elements are designed with integrated refrigerant passages, eliminating the need for separate cooling devices while controlling magnet temperature
Solution Approach 2:
The patent merges the cooling function with the rotor structural components. The core, covers, and balance weights are designed to simultaneously provide mechanical support and serve as heat dissipation pathways through integrated refrigerant passages, combining structural and thermal management functions
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 design effectively suppresses performance degradation and operational loss by maintaining the magnet's magnetic force through efficient cooling of the rotor, thereby enhancing the compressor's operational capability.
Implementation Method 1
a refrigerant flow path through which the refrigerant sequentially flows through the balance weight, the cover, and the core
Implementation Method 2
The refrigerant flow path is configured to cool the magnet, preventing temperature rise and demagnetization
Data Source
AI summary
An electric compressor including: a housing; a compression mechanism which compresses refrigerant within the housing; and a motor which provides a driving force to the compression mechanism. The motor includes a stator supported on the housing and a rotor rotated by interaction with the stator. The rotor includes a core in which a magnet is installed, a balance weight installed at an end of the core to adjust the rotation balance of the rotor, a cover that covers the core between the core and the balance weight, and a refrigerant flow path through which the refrigerant sequentially flows through the balance weight, the cover, and the core. As a result, it is possible to suppress the performance degradation and the loss of operational capability of the motor by suppressing the temperature rise of the magnet provided in the rotor of the motor and the consequent demagnetization phenomenon.