Stator Ventilation Cooling via Staggered Wedges
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Solution Overview
Problem
Large-sized permanent magnet machines experience excessive temperature rises due to increased internal losses, affecting safe operation and requiring inefficient ventilation and cooling methods that increase weight and cost.
Innovation Solution
A stator with concentrated windings and staggered wedges forming extended ventilation paths, separating the electric machine into high and low pressure areas to facilitate effective cooling, reducing material consumption and preventing winding movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If radial ventilation duct is added to meet heat dissipating capability requirements, then heat dissipation is improved, but effective material utilization rate decreases and weight and cost increase
Solution Approach 1:
The invention merges the ventilation path function with the existing slot structure by using wedges to form ventilation paths within the slot gaps. This combines the cooling function with the structural support function, eliminating the need for separate radial ventilation ducts and reducing overall machine weight while maintaining heat dissipation capability.
Solution Approach 2:
The invention transitions from traditional radial ventilation to axial ventilation by arranging wedges to create ventilation paths along the axial direction. This dimensional change allows cooling air to flow through the concentrated windings more effectively without requiring additional radial space or ventilation ducts.
2Temperature
If radial ventilation duct is added to meet heat dissipating capability requirements, then heat dissipation is improved, but effective material utilization rate decreases
Solution Approach 1:
The ventilation path is merged with the slot structure using wedges, combining the cooling function with the structural support function. This eliminates the need for separate radial ventilation ducts that would occupy valuable space, thereby maintaining high effective material utilization rate while achieving adequate heat dissipation.
3Temperature
If conventional ventilation cooling is used, then cooling is provided, but concentrated windings are not effectively cooled and power density cannot be improved
Solution Approach 1:
The invention applies local quality by placing multiple wedges at specific positions within the slot to create targeted ventilation paths that directly cool the concentrated windings. This localized approach ensures effective cooling where heat generation is highest, enabling improved power density without compromising thermal management.
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
Enhances heat dissipation, improves power density, reduces weight and cost, and prolongs the service life of the electric machine by effectively cooling the concentrated windings and constraining the windings to prevent insulation damage.
Implementation Method 1
entering cold air into the high pressure area via pipelines, cooling the electric machine via the first ventilation path formed by a gap between the at least two wedges
Implementation Method 2
entering cold air into the high pressure area via pipelines, cooling the electric machine via the first ventilation path
Data Source
AI summary
A stator used for a motor, the motor and a ventilation cooling method for the motor. The stator includes concentrated windings, and at least two wedge blocks are arranged at the gaps between the adjacent concentrated windings. The at least two wedge blocks are distributed on the concentrated windings in a staggered manner to form a first ventilation path. Therefore, the concentrated windings can be cooled effectively, the concentrated windings are effectively constrained in the circumferential direction by means of the at least two wedge blocks, the service life of the motor is further prolonged, and the reliability of the motor is improved.