Centrifugal Pump Axial-Flux Motor Integration
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Solution Overview
Problem
Existing centrifugal pump systems are large, heavy, and complex due to the need for separate motors and driveshafts, which limits their efficiency and compactness in fluid handling applications.
Innovation Solution
A centrifugal pump system integrated with an axial-flux permanent magnet motor, where the impeller fins serve as both permanent magnets and ferromagnetic pole shoes, sharing a common housing and bearing assembly, and an electric stator is used to drive the rotor via axial flux impingement, eliminating the need for a separate motor and driveshaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate motor and driveshaft are used to drive the centrifugal pump impeller, then the pump can achieve reliable fluid pumping, but the system becomes large, heavy, and complex with many moving parts
Solution Approach 1:
The motor and pump are merged into a single integrated unit where the motor rotor and pump impeller share the same rotating assembly. The permanent magnet rotor serves dual function as both the motor rotor and the pump impeller, eliminating the driveshaft and reducing the number of moving parts while maintaining reliable pumping operation
Solution Approach 2:
The permanent magnet rotor performs multiple functions simultaneously: it acts as the motor rotor to generate rotational motion, serves as the pump impeller to move fluid, and provides magnetic coupling with the stator. This multi-functionality reduces system complexity while maintaining reliability
2Reliability
If a separate motor and driveshaft are used to drive the centrifugal pump impeller, then the pump can achieve reliable fluid pumping, but the system weight increases
Solution Approach 1:
The motor and pump are combined into a single rotating assembly where the permanent magnet rotor serves as both motor rotor and pump impeller. This eliminates the driveshaft and reduces redundant components, significantly decreasing system weight while maintaining reliable pumping function
Solution Approach 2:
The permanent magnet rotor performs dual functions as both the motor rotor and pump impeller, eliminating the need for separate driving components. This multi-functionality reduces the total mass of moving parts while ensuring reliable pump operation
3Reliability
If a separate motor and driveshaft are used to drive the centrifugal pump impeller, then the pump can achieve reliable fluid pumping, but the system size increases
Solution Approach 1:
The motor and pump are integrated into a compact single unit where the permanent magnet rotor and pump impeller are combined. This eliminates the driveshaft and reduces the spatial footprint, creating a compact system that maintains reliable pumping capability
Solution Approach 2:
The motor stator is positioned within the pump housing, and the permanent magnet rotor is nested within the stator. This nested arrangement allows the motor and pump to occupy overlapping spatial volumes, significantly reducing the overall system size while maintaining reliable operation
4Device complexity
If an axial-flux permanent magnet motor is integrated with the centrifugal pump, then the system becomes compact and lightweight, but the motor and pump must share a common housing and bearing assembly
Solution Approach 1:
The motor and pump share a common housing and bearing assembly, with the permanent magnet rotor serving dual function. This integration reduces the number of separate components and simplifies the overall structure, achieving compactness while the shared components facilitate easier manufacturing and assembly
5Power
If the impeller fins serve as both permanent magnets and ferromagnetic pole shoes, then the system achieves high power density, but the magnetic material must perform dual functions
Solution Approach 1:
The impeller fins are made of ferromagnetic material that serves dual function: as permanent magnets to generate magnetic flux for motor operation, and as ferromagnetic pole shoes to guide and concentrate the magnetic flux. This multi-functionality enables high power density in the axial-flux motor configuration
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 results in a compact, lightweight, and efficient pump system with high power density, reducing system weight, complexity, and size while maintaining efficient fluid pumping capabilities.
Implementation Method 1
energizing field poles of a stator with alternating current, and driving a permanent magnet rotor via axial flux impingement from the energized stator
Implementation Method 2
permanent magnet rotor... When energized, the ferromagnetic fluid impeller fins draw fluid axially through apertures in the stator
Implementation Method 3
Centrifugal pumps typically include a rotary impeller with a plurality of vanes or paddles that force fluid centrifugally outward and in a flow direction
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A pump system (10a) comprises a fluid housing (12), a permanent magnet rotor (18a), and an electric stator (20). The fluid housing (12) has an axis, an axial inlet (14), and a radially outer outlet (16). The permanent magnet rotor (18a) is disposed on the axis, within the fluid housing (12), and has a plurality of perimetrically distributed fins (28) that extend at least partly radially outward. The electric stator (20) is disposed on the axis and within the fluid housing (18), and is situated adjacent the impeller fins (28) of the permanent magnet rotor (18a), separated from the impeller fins (28) by an axial gap.