Rotor Lamination Airflow Structure for Self-Starting Motor Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self-starting synchronous reluctance motors face challenges with heat dissipation due to their structure of multiple magnetic barrier layers, which hinders efficient operation.
Innovation Solution
The design includes a rotor core with specific lamination structures, such as first and second rotor laminations, end rings, and strategically placed filling slots and magnetic barrier layers, allowing for increased air contact and circulation, thereby enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple magnetic barrier layers are arranged in the rotor core, then the synchronous reluctance motor achieves self-starting capability and improved efficiency, but the heat dissipation performance deteriorates due to blocked air circulation paths
Solution Approach 1:
The rotor core employs a porous lamination structure where the stacked laminations create inherent air gaps and circulation channels. These porous-like spaces between laminations allow air to flow through the rotor core, enabling effective heat dissipation while maintaining the magnetic barrier layers needed for self-starting capability.
Solution Approach 2:
The patent introduces axial air circulation paths by arranging laminations with offset slot positions between adjacent layers. This creates three-dimensional heat dissipation channels that extend in the axial direction, allowing air to flow through the rotor core from one end to the other, thus solving the heat dissipation problem without compromising the magnetic barrier structure.
2Productivity
If multiple magnetic barrier layers are arranged in the rotor core, then the motor efficiency is improved, but the air circulation area is reduced hindering heat dissipation
Solution Approach 1:
The rotor core is segmented into multiple thin laminations stacked together, with each lamination containing magnetic barrier layers. The segmentation creates numerous small air gaps between laminations that collectively form extensive air circulation paths, maintaining large total air circulation area while preserving motor efficiency through the segmented magnetic structure.
Solution Approach 2:
The patent implements a nested structure where multiple laminations are stacked to form the rotor core, with each lamination containing rotor slots and magnetic barriers. The air circulation paths are nested within the spaces between these nested laminations, allowing air to flow through the entire rotor core volume while maintaining the compact nested structure needed for high motor efficiency.
3Power
If rotor slots are filled with conductive material, then asynchronous torque is generated for self-starting, but copper loss and aluminum loss increase due to heat accumulation
Solution Approach 1:
The patent utilizes air flow (pneumatics) through the rotor core to remove heat generated by copper loss and aluminum loss in the conductive material filling the rotor slots. The air circulation paths allow continuous removal of heat, enabling the conductive material to generate asynchronous torque for self-starting without excessive heat accumulation and energy loss.
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 design improves heat dissipation by ensuring that portions of the rotor slots are in direct contact with air, reducing temperature rises, copper loss, and aluminum loss, and enhancing motor efficiency.
Implementation Method 1
portions of the rotor slots are in direct contact with air, thereby increasing the heat dissipation of the rotor
Data Source
AI summary
A motor rotor, a self-starting synchronous reluctance motor including the same, and a compressor. The motor rotor includes a rotor core, and the rotor core includes a first rotor lamination, an end ring, and a second rotor lamination. Filling slots, rotor slots, and a shaft hole are formed in the first rotor lamination. The filling slots include first filling slots and two second filling slots. The second rotor lamination is arranged between the end ring and the first rotor lamination. Through slots are formed in the second rotor lamination at positions corresponding to the filling slots of the first rotor lamination respectively. A total cross-sectional area of first portions of the rotor slots on the first rotor lamination between an edge of an inner hole and an outer circle of the second rotor lamination is less than a total cross-sectional area of the rotor slots on the first rotor lamination.