Electric Blower Bearing Layout for High-Speed Alignment and Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric blowers face challenges in maintaining accurate center alignment of the rotation shaft, stator, and bearings at high speeds, leading to whirling, and require enhanced heat dissipation as motor rotation speed increases.
Innovation Solution
The electric blower design features a rotation shaft supported by bearings disposed between the moving blade and stator, with a second air path for heat dissipation within the frame, ensuring accurate center alignment and efficient heat dissipation through airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotation speed of the motor is increased to achieve downsizing, then the motor size is reduced, but whirling is caused by centrifugal force due to misalignment of centers
Solution Approach 1:
The patent merges the bearing support function into the stator structure itself, making the stator serve dual purposes: electromagnetic function and bearing support. This integration ensures that the centers of the rotation shaft, stator, and bearings are accurately matched, preventing whirling even at high rotation speeds achieved through downsizing.
Solution Approach 2:
The patent introduces a bearing support portion as an intermediary structure within the stator that specifically addresses the center alignment issue. This intermediary component provides precise positioning for the bearings, ensuring accurate center matching between the rotation shaft, stator, and bearings, thereby eliminating whirling caused by centrifugal force during high-speed rotation.
2Power
If the rotation speed of the motor is increased, then the motor power is improved, but heat generation increases requiring enhanced heat dissipation
Solution Approach 1:
The patent makes the stator multi-functional by integrating both electromagnetic function and heat dissipation function. The stator not only generates electromagnetic force but also serves as a heat sink with built-in heat dissipation fins, allowing it to dissipate the increased heat generated by high-speed rotation effectively.
Solution Approach 2:
The stator structure serves itself by incorporating heat dissipation fins directly into its body. The same stator that generates electromagnetic force also provides its own cooling through the heat dissipation fins, eliminating the need for separate cooling systems and efficiently managing the heat generated by high-power 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
This configuration prevents whirling due to centrifugal force and enhances heat dissipation efficiency, maintaining stability and performance at higher rotation speeds.
Implementation Method 1
the rotation shaft is rotatably supported by a bearing portion
Implementation Method 2
heat generated by the motor is efficiently dissipated by air flowing through the second air path provided inside the frame
Implementation Method 3
heat generated by the motor is efficiently dissipated by air flowing through the second air path
Implementation Method 4
a centrifugal force acting on a rotating portion of the motor increases. Thus, if a center of a rotation shaft of the motor, a center of a stator, and centers of bearings supporting the rotation shaft are not accurately matched with each other, whirling may be caused by the centrifugal force
Data Source
Figure 1~2
Figure 3~4
Figure 5(A)~5(C)
AI summary
An electric blower includes a motor including a rotor having a rotation shaft, and a stator provided to surround the rotor, a moving blade mounted at one end side of the rotation shaft in the axial direction of the rotation shaft, a bearing portion provided between the moving blade and the stator in the axial direction and rotatably supporting the rotation shaft, and a frame. The frame includes a motor housing portion housing the stator, a bearing housing portion housing the bearing portion, a wall formed between the motor housing portion and the bearing housing portion and facing the moving blade, and a hole passing through the wall. The electric blower further includes a first air path outside the frame, and a second air path inside the frame. An air volume in the first air path is larger than an air volume in the second air path.