High-Speed Blower Brushless Motor Layout for Return Air and Noise
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Solution Overview
Problem
In existing brushless motor designs, air discharged from the motor shell blows towards the circuit board, causing return air and noise, which affects the air output of the motor. Additionally, the integrally formed bearing support bracket and motor shell result in a cumbersome assembly process, leading to low assembly efficiency.
Innovation Solution
A modular design for a high-speed brushless motor is introduced, featuring a casing with an outer shell and a fix cylinder, a stator component with a stator rear bracket and coil, a rotor component with a rotor shaft and permanent magnet, an impeller, a circuit board for electrical connection, and a protective sleeve for heat dissipation and noise reduction. This design separates the assembly of the stator, rotor, and casing components, improving assembly efficiency and reducing noise and heat dissipation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board is installed on the bearing support bracket to achieve electrical connection, then electrical connection is achieved, but air discharged from the motor shell blows towards the circuit board forming return air and noise
Solution Approach 1:
The bearing support bracket is divided into two separate components: the outer shell and the circuit board support bracket. This segmentation allows the circuit board to be mounted on a dedicated support structure that directs discharged air away from it, eliminating return air and noise while maintaining electrical connection functionality.
2Strength
If the bearing support bracket and motor shell are integrally formed, then structural integrity is improved, but the assembly process becomes cumbersome and assembly efficiency decreases
Solution Approach 1:
The bearing support bracket is separated from the motor shell into distinct components. The outer shell maintains structural integrity, while the circuit board support bracket is a separate piece that can be independently assembled. This segmentation significantly improves assembly efficiency by allowing parallel assembly of different components before final integration.
3Productivity
If modular design is implemented to improve assembly efficiency, then assembly efficiency is improved, but device complexity increases
Solution Approach 1:
The bearing support bracket is divided into two functional parts: the outer shell and the circuit board support bracket. This segmentation creates modular components that can be assembled independently, improving assembly efficiency without significantly increasing overall device complexity.
Solution Approach 2:
The outer shell serves multiple functions: it provides structural support, houses the circuit board support bracket, and directs air flow. This multi-functionality reduces the need for additional separate components, thereby improving assembly efficiency without proportionally increasing device complexity.
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 modular design enhances air output by preventing return air and noise, while optimizing the assembly process to improve efficiency and facilitate mass production. Effective heat dissipation is achieved through the integration of ventilation grooves and heat dissipation slots, ensuring stable motor performance.
Implementation Method 1
a circuit board provided on the stator rear bearing seat and electrically connected to the stator coil for supplying power to the stator coil and causing the stator coil to generate a magnetic field
Implementation Method 2
one end of the rotor shaft passes through the first bearing and is fixedly connected to the impeller to drive the impeller to rotate
Implementation Method 3
a ventilation chamber is formed between the outer shell and the fix cylinder... two sides of one end of the stator rear bracket close to the stator rear bearing seat are respectively provide with a heat dissipation port
Data Source
AI summary
A blower exhaust brushless motor includes: a casing including an outer shell and a fix cylinder, two ends of the outer shell are respectively provided with an air inlet and a ventilation outlet; a stator component including a stator rear bracket coaxial arranged with the fix cylinder, a stator coil provided in the stator rear bracket, and a stator rear bearing seat integrated with the stator rear bracket; a rotor component including a rotor shaft, a permanent magnet sleeved in a middle of the rotor shaft, a first bearing and a second bearing that are arranged at two ends of the rotor shaft; an impeller, an end of the rotor shaft passes through the first bearing and is fixedly connected to the impeller to drive the impeller to rotate; a circuit board electrically connected to the stator coil; and a protective sleeve.