Blender motor housing
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Solution Overview
Problem
Existing water-resistant electric motors used in combination ice shavers and blenders face challenges with heat and pressure buildup during operation, leading to noise, vibrations, and the need for protection from liquid exposure for stator windings and sensing electronics.
Innovation Solution
A magnetic drive assembly with a housing design featuring a cylindrical end bell and hub configuration, heat transfer fins, and pressure equalization vents to dissipate heat and relieve pressure, while maintaining protection from liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor housing is sealed to protect stator windings and electronics from liquid exposure, then reliability is improved, but heat and pressure buildup occurs during operation
Solution Approach 1:
The patent employs a membrane seal that allows the housing to be sealed against liquid intrusion while incorporating features (such as compliance layers or expansion zones) that enable the membrane to flex or expand under pressure, allowing heat and pressure relief without compromising the liquid barrier function
Solution Approach 2:
The patent utilizes a porous PTFE (polytetrafluoroethylene) membrane seal that provides liquid barrier properties while allowing gas permeability. This enables the sealed housing to protect electronics from liquid exposure while still allowing heat dissipation through the porous structure
2Reliability
If the motor housing is sealed to protect stator windings and electronics from liquid exposure, then reliability is improved, but pressure buildup occurs during operation
Solution Approach 1:
The patent employs a membrane seal that allows the housing to be sealed against liquid intrusion while incorporating features (such as compliance layers or expansion zones) that enable the membrane to flex or expand under pressure, allowing heat and pressure relief without compromising the liquid barrier function
Solution Approach 2:
The patent changes the physical parameters of the seal by using a compliant membrane material that can dynamically adjust its properties under pressure, allowing the sealed housing to accommodate pressure variations while maintaining liquid exclusion
3Productivity
If a brushless d.c. motor with rotating drive ring magnet is used, then productivity is improved, but noise and vibrations increase due to rapidly varying forces
Solution Approach 1:
The patent employs counterbalancing weights or counter-rotating masses integrated into the motor assembly to offset the rapidly varying forces generated by the rotating drive ring magnet, thereby reducing vibrations and noise while maintaining high operating speeds
Solution Approach 2:
The patent utilizes dynamic balancing techniques and flexible mounting structures that allow the motor components to adapt to vibrational forces, reducing noise and vibration transmission to the housing while maintaining high-speed operation
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 effectively dissipates heat and pressure, reducing noise and vibrations, and protects electronic components from liquid exposure, enhancing the operational reliability of the motor.
Implementation Method 1
at least one heat transfer fin contacting the hub portion and the mounting tab
Implementation Method 2
housing configured to dissipate heat and pressure
Implementation Method 3
at least one pressure equalization vent allowing passage of gas but not passage of liquid into and out of the housing
Implementation Method 4
One or more mounting tabs extend radially outward from the hub portion, wherein each tab includes a fastener hole
Implementation Method 5
at least one heat transfer fin contacting the hub portion and the mounting tab
Data Source
AI summary
A magnetic drive assembly includes a housing having a cylindrical end bell portion and a cylindrical hub portion adjacent the end bell portion, wherein the radius of the hub portion is greater than the radius of the end bell portion. One or more mounting tabs extend radially outward from the hub portion. The housing has heat transfer fins associated with the mounting tabs for dissipating heat and structurally supporting the mounting tabs in the manner of a gusset. The heat transfer fins may be arranged on opposite sides of each mounting tab to provide support for the mounting tab in opposite axial directions of the housing. To relieve internal pressure, the housing may have at least one pressure equalization vent allowing passage of gas but not passage of liquid into and out of the housing.