High-efficiency and high-speed vacuum cleaner motor
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Solution Overview
Problem
Vacuum cleaner motors are prone to bearing and stator damage due to exposure to water and large dust particles in the mopping environment, affecting their service life.
Innovation Solution
The vacuum cleaner motor design includes semi-closed bearing mounting cavities and a protected stator configuration, with the impeller and protection cover shielding the bearings and stator from direct air duct exposure, and a cooling system to manage heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the stator and rotor are exposed to the air duct for cooling, then the cooling effect is improved, but the bearings and stator core are easily damaged due to contact with water and large dust particles
Solution Approach 1:
The air duct is divided into a first air duct and a second air duct. The first air duct is used for cooling the stator, while the second air duct is used for discharging air generated by the impeller. This segmentation prevents water and large dust particles from entering the bearing mounting cavities while maintaining effective cooling of the stator.
Solution Approach 2:
Guide channels are introduced as intermediary structures to guide the airflow from the first air duct to cool the stator. The guide channels are positioned to avoid direct exposure of the bearings and stator core to the air duct, thus protecting them from water and large dust particles while maintaining cooling efficiency.
2Device complexity
If the bearings are exposed to the air duct, then the structure is simplified, but the bearings are easily damaged due to long-term contact with water and large dust particles
Solution Approach 1:
The air duct is segmented into first and second air ducts with distinct functions. The first air duct provides cooling without exposing bearings to contaminants, while the second air duct handles air discharge. This segmentation protects bearings while maintaining structural efficiency.
Solution Approach 2:
The harmful elements (water and large dust particles) are extracted from the cooling path by routing the cooling airflow through the first air duct and guide channels, separating it from the bearing mounting cavities. This extraction protects the bearings from contaminants while maintaining the overall structural simplicity.
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 prolongs the service life of the motor by protecting the bearings and stator from environmental contaminants and effectively dissipating heat, enhancing motor reliability and efficiency.
Implementation Method 1
at least one pre-compressed pre-tightening spring is arranged in the first bearing mounting cavity or the second bearing mounting cavity, and the pre-tightening spring abuts against the corresponding bearing on the rotor
Implementation Method 2
a stator is arranged in an air duct and cooled mainly by means of an air flow. Because a coil on the stator will generate heat when the stator operates
Data Source
AI summary
A high-efficiency and high-speed vacuum cleaner motor includes a fan housing, a motor housing and an impeller housing. A stator is fixedly arranged in the motor housing. A rotor extends through the middle of the stator. A protection cover is fixedly mounted at an end, opposite to the impeller housing, of the motor housing. The protection cover and the impeller housing are respectively provided with a first bearing mounting cavity and a second bearing mounting cavity. Air is prevented from passing through bearings, and the protection cover, the impeller housing and an impeller cover the bearing mounting cavities to prevent the bearings against direct contact with an air duct; moreover, the stator is not directly exposed to the air duct, such that a stator core and the bearings are effectively protected, thus prolonging the service life of the motor.