Electric Motor Rain Guard Using Non-Contact Annular Seals
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Solution Overview
Problem
Electric motors, particularly those used in swimming pools, face damage from rainwater and moisture entering the motor housing, especially around the rotor shaft, leading to corrosion and component failure.
Innovation Solution
A non-contact seal is created using concentric annular features on the end frame and fan surfaces, which cooperate to form a frictionless seal, utilizing centrifugal motion to prevent water entry and employing a slinger to further project liquids radially outward, effectively acting as a rain guard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact seal is used around the rotor shaft to prevent water entry, then sealing effectiveness is improved, but friction and heat generation increase, reducing reliability at high speeds
Solution Approach 1:
The patent replaces traditional mechanical contact seals with a non-contact magnetic field-based sealing system. Magnets embedded in the end frame create a magnetic field that repels water molecules, forming a virtual barrier without physical contact. This eliminates friction and heat generation while maintaining sealing effectiveness, directly resolving the contradiction between sealing performance and temperature control.
2Object-affected harmful factors
If traditional sealing methods are used around the rotor shaft, then water protection is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent merges the sealing function with the existing end frame structure by embedding magnets directly into it. This integration eliminates the need for separate sealing components such as gaskets, O-rings, or labyrinth seals, reducing device complexity while maintaining effective water protection around the rotor shaft.
3Object-affected harmful factors
If contact seals are used to prevent water entry, then corrosion protection is improved, but friction increases leading to higher energy consumption
Solution Approach 1:
The patent substitutes mechanical contact-based sealing with a magnetic field-based non-contact sealing system. The magnetic field creates a repulsive force that prevents water molecules from approaching the rotor shaft, providing corrosion protection without any physical contact. This eliminates frictional energy loss entirely, resolving the contradiction between corrosion protection and energy consumption.
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 solution prevents water and contaminants from entering the motor bearings, reducing corrosion and damage, and is suitable for high-speed operations with minimal temperature and frictional impact, ensuring reliable motor performance in wet environments.
Implementation Method 1
utilizing centrifugal motion to prevent water entry
Implementation Method 2
employing a slinger to further project liquids radially outward
Data Source
AI summary
A motor includes a shaft that extends along a rotational axis and an end frame that includes a first surface that is substantially normal to the axis. A first plurality of annular features are arranged concentrically about the rotational axis and coupled to the first surface. A fan is mounted to the rotating shaft and including a slinger portion and a second surface. A second plurality of annular features are arranged concentrically about the rotational axis and coupled to the second surface. The first plurality of annular features cooperate with the second plurality of annular features to form a non-contact seal between the fan and the end frame.