Impeller Motor Assembly With Diffuser Hub Venting for Bearing Cooling
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Solution Overview
Problem
In motor assemblies with reduced stator and rotor sizes, increasing rotor speed leads to excessive temperature, bearing wear, and reduced bearing strength, causing decreased motor efficiency and shortened bearing life due to increased air flow resistance and displacement.
Innovation Solution
A motor assembly design featuring a first and second diffuser with a communicating portion at the hub, allowing heated air to be discharged externally and promoting cooling, while restricting vibration and displacement of the bearing through enhanced heat exchange and structural coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of rotations of the rotor is increased to maintain air volume when stator and rotor sizes are reduced, then the air volume is maintained, but the temperature of the stator and rotor is excessively increased
Solution Approach 1:
The patent segments the cooling function by providing separate cooling paths: one for the stator (through the stator coil cooling passage) and one for the rotor (through the rotor core cooling passage). This allows independent temperature control of each component while maintaining high rotation speeds necessary for air volume performance.
Solution Approach 2:
The patent introduces cooling passages as intermediary structures that facilitate heat removal. The stator coil cooling passage and rotor core cooling passage act as intermediaries between the heat-generating components and the cooling medium, enabling efficient heat transfer without compromising the high-speed rotation needed for air volume maintenance.
2Productivity
If the number of rotations of the impeller and rotor is increased, then the air volume is maintained, but the amount of displacement of the bearing increases, thereby shortening the life of the bearing
Solution Approach 1:
The bearing support structure is segmented into multiple bearing units distributed around the rotor periphery. This segmentation allows each bearing to handle smaller loads individually, reducing displacement and wear on each bearing unit while maintaining the overall high rotation capability needed for air volume performance.
Solution Approach 2:
The patent employs dynamic bearing support mechanisms that can adapt to the centrifugal forces generated at high rotation speeds. The bearing arrangement and structural design allow for dynamic load distribution that minimizes bearing displacement and extends bearing life under high-speed operating conditions.
3Productivity
If the number of rotations of the impeller and rotor is increased, then the air volume is maintained, but the bearing strength for supporting the rotating shaft is further reduced due to size reduction of the stator and rotor, thereby increasing the wear of the bearing
Solution Approach 1:
The bearing support system is segmented into multiple bearing units strategically positioned to distribute the load on the rotating shaft. This segmentation compensates for the reduced size of the stator and rotor by providing multiple points of support, thereby maintaining adequate bearing strength and reducing wear at each support point.
Solution Approach 2:
The patent incorporates preliminary strengthening measures in the bearing support structure design, such as optimized bearing preloading and structural reinforcement around bearing mounting locations. These preliminary actions prepare the bearing system to withstand the increased stresses from high-speed rotation despite the reduced overall motor size.
4Temperature
If a portion of the air passing through the impeller is moved toward the stator and rotor to cool them, then the temperature is reduced, but the air flow resistance increases, thereby degrading power and efficiency of the motor
Solution Approach 1:
The cooling system is segmented into dedicated cooling passages for the stator and rotor, separate from the main air flow path through the impeller. This segmentation allows cooling air to be extracted from the main flow with minimal disruption, reducing air flow resistance while still achieving effective cooling of both stator and rotor components.
Solution Approach 2:
The patent introduces cooling passages as intermediary channels that tap into the air flow system without creating significant resistance. These passages act as intermediaries that divert a controlled portion of air for cooling purposes while maintaining the overall air flow efficiency and motor power output.
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 design maintains a lower motor temperature, reduces electrical resistance, and enhances power output by efficiently cooling the motor and bearing, thereby improving bearing strength and extending its lifespan.
Implementation Method 1
air inside the hub of the second diffuser heated by the motor may be discharged to the outside of the second diffuser through the communicating portion... accelerating cooling of the motor
Implementation Method 2
A motor is a device that converts electrical energy into mechanical energy
Data Source
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.