Wound Rotor Motor Cooling via Axial Airflow Passages
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Solution Overview
Problem
Wound rotor synchronous motors face challenges in cooling the rotor coil efficiently due to copper loss from resistance, leading to heating issues and reduced performance, especially at high speeds, and the use of rare earth metals in permanent magnet synchronous motors is costly and limited.
Innovation Solution
The design incorporates an open structure with air movement passages and bobbins that support the rotor coil, allowing external air to flow axially and cool the rotor coil directly, eliminating the need for an end coil cover and molded resin, thereby reducing copper loss and enhancing cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an end coil cover with molded resin is used to fix the rotor coil, then the rotor coil is securely fixed, but the cooling performance deteriorates and the structure becomes complex
Solution Approach 1:
The invention removes the end coil cover and molded resin structure from the rotor assembly. Instead of using a closed enclosure with thermal insulation, the rotor coils are exposed to allow direct airflow cooling, extracting the harmful thermal insulation function while maintaining mechanical support through a simplified structure.
Solution Approach 2:
The invention introduces a forced convection cooling system using airflow through the rotor assembly. Air is supplied to the rotor coils to directly cool them, utilizing pneumatic cooling rather than relying on passive thermal conduction through molded resin, thereby significantly improving heat dissipation.
2Stability of the object's composition
If an end coil cover with molded resin is used to fix the rotor coil, then the rotor coil is securely fixed, but the device complexity increases
Solution Approach 1:
The invention eliminates the end coil cover and molded resin components entirely, removing unnecessary structural elements that complicated the rotor assembly. The rotor coils are supported and fixed using a simpler configuration without requiring separate covering components.
Solution Approach 2:
The invention integrates the support and fixation functions directly into the rotor structure itself, merging multiple functions into a unified design. The rotor structure simultaneously provides mechanical support, coil positioning, and cooling pathways, eliminating the need for separate end coil covers and molded resin components.
3Speed
If copper coils are wound in the rotor at high speed, then the motor operates efficiently, but the rotor coil separates due to centrifugal force
Solution Approach 1:
The invention employs dynamic support structures that can withstand centrifugal forces at high rotation speeds. The rotor coil support system is designed to maintain structural integrity under dynamic loading conditions, allowing the motor to operate efficiently at high speeds without coil separation.
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 solution reduces copper loss, increases motor efficiency, lowers energy consumption, and improves durability while reducing production costs by eliminating unnecessary components and simplifying the assembly process.
Implementation Method 1
a plurality of air movement passages which are formed in the rotor body and are opened to the outside in an axial direction
Implementation Method 2
copper loss occurs by resistance of a rotor coil, and which causes performance of a motor to deteriorate by causing heating of the rotor coil
Data Source
AI summary
A rotor of a wound rotor driving motor is provided. The rotor includes a rotor body that is rotatably installed with a predetermined air gap within a stator and in which a rotor coil is wound in a plurality of rotor teeth. A bobbin is fixed to the rotor body by the rotor coil disposed at opposing sides of an axial direction of the rotor body and supports the rotor coil. The rotor body forms a plurality of air movement passages that are opened to the exterior in an axial direction therein, and the bobbin forms a plurality of connection passage that are coupled to the air movement passages.