Split Motor Bearing Layout for Low-Noise Blower Operation
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Solution Overview
Problem
Existing blower motors face issues with noise, vibration, and production efficiency due to limitations in armature length, bearing alignment, and assembly complexity, leading to reduced power density and increased noise.
Innovation Solution
A split type motor design featuring a rotor assembly with bearings at both ends, an elastic component between the bearing and magnetic ring, and a simplified air channel structure with one-time clamping and machining, enhancing assembly convenience and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the armature is designed to be long to increase power density, then the power density is improved, but the motor vibrates more severely and generates more noise during high-speed rotation
Solution Approach 1:
The motor structure is divided into modular components: the armature module (containing stator, rotor, and PCB) is separated from the air channel assembly. This segmentation allows independent optimization of each module, enabling the armature to be designed with sufficient length for high power density while the air channel structure is optimized to reduce vibration and noise during operation.
2Stability of the object's composition
If bearings are arranged in separate locations (one in air channel, one on rear cap) to improve stability, then the bearing support is enhanced, but the straightness of bearing chambers deteriorates and assembly becomes difficult
Solution Approach 1:
Both bearing chambers are integrated into the same air channel structure rather than being distributed across separate components. This merging ensures that both bearings are supported by the same rigid structure, maintaining excellent straightness and alignment. The integrated design also simplifies assembly by eliminating the need to separately position and align bearings on different components.
3Stability of the object's composition
If the air channel is clamped and machined twice on a machine tool to accommodate bearing chambers, then the bearing support structure is improved, but the production efficiency deteriorates
Solution Approach 1:
The air channel is designed with bearing chambers that can be machined in a single clamping operation. The structure is preliminarily configured to allow both bearing chambers to be accessed and machined from the same setup, eliminating the need for re-clamping and re-positioning. This preliminary design consideration maintains excellent bearing chamber straightness while significantly improving production efficiency by reducing machining cycle time.
Data Source
AI summary
The present disclosure discloses a split type motor, including an air channel and an armature module, wherein the armature module includes a housing, a stator assembly, a rotor assembly, and a printed circuit board (PCB); the housing is cylindrical; the rotor assembly includes a rotating shaft, a magnetic ring, a first bearing, and a second bearing; the housing is provided with a first bearing chamber and a second bearing chamber; an elastic component is arranged between the first bearing and the magnetic ring; the air channel includes an inner ring and an outer ring concentrically arranged; the inner ring encloses and forms a circular through cavity matched with the housing; a ventilation cavity is formed between the inner ring and the outer ring; and several flow guide plates are arranged in the ventilation cavity.