Dual-Diffuser Motor Assembly for Bearing Cooling and Airflow
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Solution Overview
Problem
Reduced sizes of stator and rotor in motor assemblies lead to increased temperature, air flow resistance, bearing wear, and reduced bearing strength, which degrade power and efficiency.
Innovation Solution
A motor assembly design with a first and second diffuser configuration, where the second diffuser has a hub with a bearing accommodating portion, thermal conductivity superior to the first diffuser, and a communicating portion for air discharge, promoting cooling and reducing vibration and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sizes of the stator and rotor are reduced, then the motor size is decreased, but the air volume is reduced and temperature increases
Solution Approach 1:
The diffuser is divided into a first diffuser and a second diffuser with different functions. The first diffuser promotes air movement and cooling, while the second diffuser optimizes airflow to the impeller. This segmentation allows each component to be optimized for its specific function, enabling effective cooling in a compact motor design.
Solution Approach 2:
The first diffuser acts as an intermediary component between the motor and the second diffuser. It receives air from the motor, promotes its movement through the diffuser passage, and delivers it to the second diffuser. This intermediary structure enables efficient heat transfer and airflow management in the compact design.
2Productivity
If the number of rotations of the rotor is increased to maintain air volume, then the air volume is maintained, but the temperature of the stator and rotor increases excessively
Solution Approach 1:
The patent utilizes pneumatic principles by designing a diffuser passage that efficiently moves air from the motor to the impeller. The first diffuser promotes air movement through its specific geometry, creating effective cooling airflow without requiring excessive rotational speed. This pneumatic optimization allows maintaining productivity while controlling temperature.
Solution Approach 2:
The patent changes the physical parameters of the diffuser structure, including the shape and dimensions of the diffuser passage, to optimize airflow characteristics. By adjusting these parameters, the system achieves efficient cooling and air movement, allowing the motor to operate at lower temperatures while maintaining required air volume and productivity.
3Productivity
If the number of rotations of the impeller and rotor is increased, then the air volume is maintained, but the displacement of the bearing increases and the life of the bearing shortens
Solution Approach 1:
The patent converts the harmful effect of high-speed rotation into a beneficial cooling effect. By designing the diffuser to efficiently utilize the airflow generated at high speeds, the system achieves the required air volume while the airflow itself provides cooling that protects the bearing from excessive temperature and wear, thereby extending bearing life despite high rotational speeds.
4Productivity
If the number of rotations of the impeller and rotor is increased, then the air volume is maintained, but the bearing strength is reduced and wear of the bearing increases
Solution Approach 1:
The diffuser passage design utilizes pneumatic principles to create controlled airflow that provides cooling to the bearing. The first diffuser promotes air movement that directs cooled air toward the bearing area, compensating for the reduced bearing strength and increased wear that would normally result from high-speed operation. This pneumatic cooling system allows maintaining productivity while protecting bearing integrity.
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
Maintains low motor temperature, reduces electrical resistance, enhances power output, and improves bearing strength and durability by facilitating efficient cooling and structural integrity.
Implementation Method 1
the second diffuser may be made of a material having a thermal conductivity superior to the first diffuser. Accordingly, heat dissipation of the second diffuser may be promoted, and cooling of the bearing may be further promoted.
Implementation Method 2
an air flow path having a relatively low pressure is provided between the inside of the impeller cover and the outside of the hub of the second diffuser. As a result, the air inside the hub of the second diffuser, which has a relatively high pressure, is quickly moved to the air flow path through the communicating portion and contacts the motor inside the hub to form an air current moved toward the communicating portion, thereby accelerating cooling of the motor.
Data Source
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AI summary
A motor assembly includes an impeller, a first diffuser at a downstream side of the impeller, a second diffuser at a downstream side of the first diffuser, an impeller cover coupled to the second diffuser and accommodating the impeller and the first diffuser, and a motor provided at the downstream side of the second diffuser to drive the impeller. The second diffuser includes a hub, an outer wall concentrically disposed outside the hub, and a plurality of blades having one side connected to the hub and the other side connected to the outer wall. The impeller cover is coupled to the outer wall of the second diffuser. A communicating portion for allowing fluid communication between inside and outside of the hub of the second diffuser is provided at the hub of the second diffuser.