Pump Rotor Magnet With Axial Grooves for Reduced Stator Distance
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Solution Overview
Problem
The existing pump designs, such as those described in Patent Literature 1, face performance degradation due to a large distance between the stator and the magnet, which affects the motor's efficiency and can lead to abnormal heating and demagnetization.
Innovation Solution
A pump design that integrates a rotor with a magnet and sleeve bearing using thermoplastic resin, featuring groove portions on the magnet's outer periphery, which reduces the distance between the stator and the magnet, enhancing motor performance and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer peripheral portion of the magnet is coated with resin to fix the magnet, then the magnet is securely held, but the distance between the stator and the magnet increases, degrading motor performance
Solution Approach 1:
The magnet and sleeve bearing are merged into a single integrated component through integral molding with thermoplastic resin. This eliminates the need for separate resin coating on the magnet's outer periphery, as the magnet is held by the resin at its central portion only, thereby reducing the distance between the stator and magnet while maintaining secure magnet fixation.
2Stability of the object's composition
If the magnet is held securely by resin coating, then the magnet position is stable, but the motor efficiency decreases due to increased stator-magnet distance
Solution Approach 1:
The magnet and sleeve bearing are combined into one integrated structure where the magnet is held by thermoplastic resin at its central portion. This merging allows the magnet to be securely positioned without requiring outer peripheral resin coating, thus maintaining magnet position stability while reducing the stator-magnet distance to improve motor efficiency.
3Ease of manufacture
If groove portions are provided on the magnet outer periphery, then the magnet can be held by resin without outer coating, but the magnet structure becomes more complex
Solution Approach 1:
The groove portions are formed directly on the magnet during its manufacturing process, and the sleeve bearing is integrated with the magnet through integral molding. This merging approach simplifies the overall structure by eliminating separate components and assembly steps, making the magnet easier to manufacture despite the presence of groove portions.
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 integrated design with thermoplastic resin securely holds the magnet, reducing the stator-magnet distance, improving pump performance and preventing thermal shock-induced cracking, thereby enhancing the overall quality and efficiency of the refrigeration cycle apparatus.
Implementation Method 1
a magnet and a sleeve bearing disposed inside the magnet are integrally assembled together by using a thermoplastic resin at a same time
Implementation Method 2
a magnet having groove portions, which have a substantially angular shape and are arranged radially in an outer peripheral portion of the magnet
Data Source
AI summary
In a pump, a resin magnet included in a rotor portion has a plurality of groove portions in an outer peripheral portion thereof, the groove portions extending in an axial direction.