Electric Water Pump Separator Layout for Reduced Rotor-Stator Gap
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Solution Overview
Problem
Conventional electric water pumps have a design where the separator completely covers the upper surface of the stator, increasing the axial distance between the rotor and the stator, which decreases the motor's output and efficiency.
Innovation Solution
The electric water pump design incorporates a separator that is formed integrally with the upper portion of the stator, airtightly surrounding it without covering the upper surface, thereby reducing the axial distance between the rotor and the stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator completely covers the upper surface of the stator, then the stator is well protected from fluid, but the axial distance between the rotor and stator increases, reducing motor output and efficiency
Solution Approach 1:
The separator is segmented to cover only the side surfaces of the stator cores while leaving the upper surfaces exposed. This segmentation allows the separator to protect the stator from fluid infiltration through the gaps between cores without adding excessive axial thickness that would reduce motor output.
Solution Approach 2:
The separator design transitions from a conventional thick axial structure to a radial extension structure that protrudes from the side surfaces of the stator cores. This dimensional change allows the separator to provide fluid protection while minimizing axial distance between the rotor and stator.
2Reliability
If the separator completely covers the upper surface of the stator, then fluid isolation is improved, but the axial distance increases, reducing motor efficiency
Solution Approach 1:
The separator is divided into multiple segments, each covering the side surfaces of individual stator cores. This segmentation provides adequate fluid isolation between the stator and fluid while reducing the overall axial thickness compared to a complete cover design.
Solution Approach 2:
The separator is designed to provide protection only where fluid infiltration is most likely to occur (at the gaps between stator cores) rather than providing uniform coverage across the entire upper surface. This localized protection approach maintains fluid isolation while minimizing axial distance.
3Ease of manufacture
If the separator is made with minimum thickness for strength, then manufacturing cost is reduced, but the axial distance between rotor and stator increases, decreasing motor performance
Solution Approach 1:
The separator extends radially from the side surfaces of the stator cores rather than requiring significant axial thickness. This dimensional change allows the separator to maintain adequate strength for fluid isolation while minimizing axial distance between the rotor and stator, thereby preserving motor output.
Solution Approach 2:
The separator is segmented into multiple thin sections that can be manufactured independently and assembled. This segmentation allows each section to be made with minimum necessary thickness for strength, reducing overall material usage and manufacturing complexity while maintaining structural integrity.
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
This design enhancement increases the motor's output and efficiency by reducing the axial distance between the rotor and the stator, while also improving heat dissipation from the stator.
Implementation Method 1
a stator disposed beneath the rotor and configured to rotate the rotor by generating a magnetic field using an externally applied current
Implementation Method 2
The separator is formed integrally with an upper portion of the stator so as to airtightly surround the upper portion of the stator, without covering an upper surface of the stator
Data Source
AI summary
An electric water pump is configured to reduce an axial distance between a stator and a rotor. Since a separator of a stator casing is formed so as not to cover an upper surface of a stator, the axial thickness of the separator is reduced and the axial distance between the stator and the rotor is also reduced. The reduction in the axial distance allows a motor to have increased output and efficiency.