Dynamo-Electric Machine Cooling via Speed-Adaptive Refrigerant Shielding
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Solution Overview
Problem
Conventional cooling structures for dynamo-electric machines require additional parts and complex assembly steps to efficiently switch refrigerant flow paths, increasing costs and complexity.
Innovation Solution
A cooling structure that uses a blocking wall with varying shielding characteristics to control the flow of refrigerant towards the coil ends based on rotational speed, allowing efficient cooling of both the rotor and stator by adjusting the refrigerant supply rate dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If flow path switching parts (spring, plate) are incorporated in the rotor to efficiently cool the motor, then cooling efficiency is improved, but the number of parts increases and assembling steps increase leading to increased cost
Solution Approach 1:
The invention extracts the flow path switching function from the rotor and relocates it to the stator. By providing a refrigerant supply path in the stator that communicates with the rotor through a partition wall, the system achieves flow path switching without incorporating complex switching parts (springs, plates) in the rotor, thereby reducing rotor complexity and part count while maintaining cooling efficiency
Solution Approach 2:
The partition wall acts as an intermediary element between the stator and rotor. It includes a refrigerant supply path that enables controlled communication between the stator refrigerant supply and the rotor, allowing efficient refrigerant distribution to cool both the coil ends and rotor core without requiring complex mechanical switching mechanisms
2Adaptability or versatility
If a blocking wall is provided in the refrigerant splash path to control refrigerant flow, then refrigerant distribution is optimized according to rotational speed, but device complexity increases
Solution Approach 1:
The blocking wall is provided locally at specific positions within the refrigerant splash path rather than throughout the entire system. This localized approach allows selective control of refrigerant flow to different areas (coil ends vs. rotor core) based on rotational speed, achieving adaptive cooling without adding excessive structural complexity
Solution Approach 2:
The blocking wall configuration enables dynamic refrigerant flow control that adapts to changing operational conditions. During high-speed rotation, the blocking wall directs refrigerant primarily to the rotor core; during low-speed rotation, it allows refrigerant to reach the coil ends, providing versatile cooling adaptation without complex control mechanisms
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 configuration enables efficient and cost-effective cooling of dynamo-electric machines by optimizing refrigerant distribution according to rotational speed, reducing heat in critical components and enhancing lubrication during high-speed operation.
Implementation Method 1
the refrigerant, which splashes in the refrigerant splash path from the refrigerant outlet toward the coil end due to centrifugal force
Implementation Method 2
the rate at which a blocking wall, provided in a refrigerant splash path between the refrigerant outlet and the coil ends, which shields the coil ends against the refrigerant, is low during low-speed rotation and high during high-speed rotation of the rotor
Data Source
AI summary
A cooling structure is provided for a dynamo-electric machine. The cooling structure has a refrigerant supply path for introducing a refrigerant into a rotor, and refrigerant outlets that are opened to the refrigerant supply path so that the refrigerant will be splashed onto the coil ends of a stator as the rotor rotates. Blocking wall members are provided in refrigerant splash paths between the refrigerant outlets and the coil ends for blocking a portion of the refrigerant, which splashes from the refrigerant outlets when the rotor rotates. The rate at which the blocking wall members shield the coil ends against the refrigerant is low when the rotor rotates at a low speed and is high when the rotor rotates at a high speed.