Rotor Oil Containers for Stator Coil End Cooling
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Solution Overview
Problem
Existing rotating electrical machines face challenges in accurately and efficiently cooling the coil end of the stator due to complex manufacturing processes and inefficient oil exhaustion methods, leading to increased costs and reduced cooling effectiveness.
Innovation Solution
The design incorporates oil containers with scoop-up and exhaust outlets on the rotor side plates, utilizing centrifugal force to compress air and oil, which are then expelled to the stator coil end, creating bubbles to reduce friction loss and ensure efficient cooling by spraying oil evenly across the coil end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional oil holes and oil exhaust holes are formed toward the coil end side, then cooling of the stator coil end is achieved, but the manufacturing process becomes complicated and manufacturing cost increases
Solution Approach 1:
The invention extracts the oil exhaustion function from the conventional complex hole structure and concentrates it into a single oil container with a scoop-up part and exhaust outlet. This simplifies the manufacturing process by eliminating the need to form multiple oil holes and exhaust holes toward the coil end side, while maintaining effective cooling of the stator coil end through the simplified oil supply path.
Solution Approach 2:
The oil container serves multiple functions: it stores oil, scoops up oil through rotation, compresses air, and exhausts oil to the coil end. This multi-functional design replaces the conventional separate oil holes and exhaust holes, simplifying the overall structure and manufacturing process while achieving effective cooling.
2Reliability
If conventional oil exhaust holes are positioned at a relatively long distance from the coil end, then oil can be exhausted, but the exhausted oil scatters and cannot be exhausted to a specific area with high accuracy
Solution Approach 1:
The oil container acts as an intermediary device between the oil supply and the coil end. It scoops up oil, stores it, and exhausts it through a controlled outlet positioned to deliver oil precisely to the coil end area. This intermediary structure prevents oil scattering and ensures accurate delivery to the target cooling zone.
Solution Approach 2:
The oil is preliminarily stored and prepared in the oil container before being exhausted to the coil end. The scoop-up part accumulates oil during rotation, and the exhaust outlet is positioned to deliver the oil precisely when needed, ensuring accurate and effective cooling without scattering.
3Temperature
If an oil supply pump is added to the conventional system, then oil can be supplied to the coil end, but manufacturing cost increases
Solution Approach 1:
The oil container system is self-service: it automatically scoops up oil through the rotation of the rotor, stores it, and exhausts it to the coil end without requiring an external oil supply pump. The rotation of the rotor itself provides the mechanism for oil pickup and delivery, eliminating the need for additional pumping equipment and reducing system complexity and manufacturing cost.
Solution Approach 2:
The system uses hydraulic principles where the rotation of the oil container creates centrifugal force to scoop up oil, and the compression of air inside the container provides pressure to exhaust the oil through the outlet. This pneumatic-hydraulic mechanism replaces the need for a mechanical oil supply pump, simplifying the system structure.
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 approach allows for precise and efficient oil exhaustion to the stator coil end, reducing friction loss and enhancing cooling efficiency while minimizing manufacturing costs through simplified design and improved oil distribution.
Implementation Method 1
When the rotor is rotating, the scoop-up part scoops up oil (as coolant) stored in the housing
Implementation Method 2
the oil and inside air in the oil container are compressed
Data Source
AI summary
A rotating electrical machine has a housing, a stator having a stator core and a rotor having a rotor core and rotor side plates rotatably supported by the housing. The rotor core is arranged to have a gap between the end surfaces of the rotor core and the stator. Oil containers are arranged on at least one surface of the rotor side plate. Each oil container has a scoop-up part and an exhaust outlet formed on end sections thereof. When the rotor is rotating, the scoop-up part scoops up an oil stored in the housing, the oil and inside air are compressed in the oil container, and the exhaust outlet exhausts the oil and compressed air to the coil end of the stator. The housing stores the oil at a lowermost side thereof so that the scoop-up part and the exhaust outlet are immersed in the oil.