Electronic Water Pump Rotor Assembly With Sealed Iron Core
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Solution Overview
Problem
Rotor iron cores in electronic water pumps corrode easily when exposed to cooling liquids due to their silicon laminations.
Innovation Solution
A rotor assembly design that includes a mounting recess on the impeller base, a sleeve, and two end plates to seal the rotor iron core, preventing exposure to cooling liquid, and a structure that integrates the rotor iron core, sleeve, and end plates to enhance sealing and support, using metal end plates and a plastic impeller base for improved protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing elements and static seals are used in rotor assemblies, then assembly simplicity is maintained, but fluid leakage occurs and sealing reliability deteriorates
Solution Approach 1:
The patent combines multiple sealing functions into a single dynamic sealing element that integrates both radial and axial sealing capabilities. This dynamic sealing element merges the functions of conventional separate sealing components, achieving reliable fluid sealing while simplifying the overall assembly structure and eliminating the need for multiple static seals and sealing elements.
Solution Approach 2:
The dynamic sealing element performs multiple sealing functions simultaneously - it provides both radial sealing between the rotor and stator and axial sealing at the end faces. This multi-functional design eliminates the need for separate sealing components for different sealing directions, improving reliability while reducing assembly complexity.
2Reliability
If magnetic coupling strength is increased to prevent rotor detachment, then reliability improves, but magnetic flux loss increases and efficiency deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the magnetic coupling function at specific locations - the permanent magnets are positioned only at the axial ends of the rotor where they are needed for both rotor retention and flux transmission. This localized magnetic coupling design ensures reliable rotor retention while minimizing unnecessary magnetic flux loss in other areas of the rotor assembly.
Solution Approach 2:
The dynamic sealing element works in conjunction with the magnetic coupling system to create a balanced force field that enhances rotor retention through hydrodynamic pressure during operation, allowing the magnetic coupling strength to be optimized for flux transmission rather than bearing the full retention load during rotation.
3Power
If rotor diameter is increased to transmit sufficient magnetic flux, then power transmission improves, but pump housing space requirements increase and miniaturization is hindered
Solution Approach 1:
The patent changes key parameters by using high-strength permanent magnets with optimized magnetic properties and arranging them in a concentrated configuration at the rotor ends. This parameter optimization allows sufficient magnetic flux transmission and power transmission without requiring a large rotor diameter, enabling miniaturization while maintaining power transmission capability.
Solution Approach 2:
Instead of increasing power transmission capacity by increasing rotor diameter (two-dimensional expansion), the patent transitions to a three-dimensional optimization by concentrating magnetic flux density at the axial ends of the rotor. This dimensional shift allows high power transmission in a compact volume by exploiting the axial dimension for magnetic flux concentration.
4Reliability
If dynamic sealing elements are implemented to eliminate fluid leakage, then sealing reliability improves, but manufacturing complexity increases
Solution Approach 1:
The dynamic sealing element is designed as an integrated component that combines radial and axial sealing surfaces in a single manufactured part. This merging of sealing functions into one component simplifies manufacturing compared to assembling multiple separate sealing elements, while achieving complete fluid leakage prevention through the coordinated action of the integrated sealing surfaces.
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
Prevents corrosion of the rotor iron core and permanent magnets by sealing them from cooling liquid, simplifies assembly, reduces material and weight, and enhances structural stability and magnetic performance.
Implementation Method 1
the rotor (20) is magnetically coupled to the stator (12)
Implementation Method 2
At least one dynamic sealing element (33) is arranged between the rotor (20) and the housing (11)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A rotor assembly and an electronic water pump are provided, and the rotor assembly includes an impeller cover, an impeller base and a rotor. One end of the impeller base is connected to the impeller cover, an outer wall of the other end of the impeller base is provided with a ring-shaped mounting recess, and the rotor is mounted in the mounting recess. The rotor comprises a rotor iron core, a sleeve and at least two end plates, the rotor iron core is sleeved on an outside of the impeller base and located in the mounting recess, the sleeve is sleeved on an outside of the rotor iron core to seal the rotor iron core in the mounting recess, the at least two end plates are located on both ends of the rotor iron core, respectively. And the at least two end plates are connected to the sleeve and partly in contact with an inner wall of the sleeve.