Segmented Rotor Cooling Plate for Motor Core Strength
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Solution Overview
Problem
Conventional motor cooling systems face challenges in providing sufficient cooling to rotor and stator components without compromising the strength of the rotor core and electromagnetic performance, particularly due to the need for complex cooling flow paths with numerous holes.
Innovation Solution
A motor design featuring a rotor core divided into two core portions with a cooling plate inserted between them, distributing cooling fluid through distribution flow paths and core flow paths, which minimizes the number of penetrating holes and maintains strength while effectively cooling both the rotor and stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If many holes are formed to penetrate through the rotor core to form a cooling flow path, then the cooling fluid supply is sufficient, but the strength of the rotor core is greatly reduced
Solution Approach 1:
The rotor core is divided into two separate rotor cores that are coupled together, with the cooling flow path formed between them rather than through penetrating holes. This segmentation allows the cooling path to be created in the gap between components rather than compromising the integrity of the rotor core itself.
Solution Approach 2:
A coupling member is introduced as an intermediary component between the two rotor cores to form the cooling flow path. The cooling fluid flows through the gap between the rotor cores and coupling member, providing adequate cooling without requiring holes through the rotor core structure.
2Strength
If the thickness of rotor core is increased to secure necessary strength, then the strength is improved, but torque leakage performance deteriorates
Solution Approach 1:
Dividing the rotor core into two separate cores coupled together allows the design to achieve necessary strength through the coupling structure rather than increasing the thickness of individual rotor cores. This maintains optimal torque transmission characteristics while providing sufficient mechanical strength.
3Temperature
If a complex cooling flow path extending axially and radially is formed, then the cooling coverage is sufficient, but the device complexity increases
Solution Approach 1:
The cooling flow path is simplified by utilizing the natural gap between the two segmented rotor cores and the coupling member. This eliminates the need for complex axial and radial extensions, as the cooling fluid can flow effectively through the inter-component space.
Solution Approach 2:
The coupling member serves multiple functions: it mechanically couples the two rotor cores together to maintain structural integrity, provides a surface to form the cooling flow path, and contributes to the overall rotational balance. This multi-functionality reduces the need for separate dedicated cooling structures.
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 ensures efficient cooling of both the rotor and stator without strength reduction, maintaining electromagnetic performance and stability, thus enhancing the motor's operational efficiency and preventing demagnetization.
Implementation Method 1
a cooling flow path, disposed in the rotor, through which a cooling fluid passes to cool both the rotor and the stator
Implementation Method 2
the oil supplied to the motor may cool the rotor core while passing through the cooling flow path
Data Source
AI summary
A motor includes a rotor and a stator, in which the rotor includes: a rotor core including a plurality of core portions disposed on a rotation shaft along an axial direction of the rotor, wherein the rotor core includes a core flow path through which a cooling fluid passes through each core portion; and a cooling plate which is inserted between the two divided core portions so that both surfaces are joined to the two neighboring core portions, and a distribution flow path that distributes the cooling fluid supplied from a cooling flow path of the rotation shaft into the core flow path of the two neighboring core portions is provided between at least one of the two neighboring core portions and the cooling plate.