Permanent Magnet Motor Ventilation Structure for Low Air-Gap Loss
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Solution Overview
Problem
Existing permanent magnet motors face inefficiencies in heat dissipation due to air gaps between the stator and rotor, leading to reduced cooling effectiveness and increased air friction loss.
Innovation Solution
A permanent magnet motor design featuring a case with separate inner cavities, axial ventilation holes in the stator teeth, and a partition between the rotor and rotor pressing rings that extends into the air gap, enhancing air resistance and directing heat-exchange fluid through the axial holes for improved cooling efficiency while minimizing air friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If circular ventilation holes are disposed in the teeth of the stator for cooling, then heat dissipation from the teeth is improved, but air friction loss increases due to heat-exchange fluid flowing through the air gap
Solution Approach 1:
The patent segments the inner cavity into a first inner cavity and a second inner cavity using the partition structure. This segmentation prevents heat-exchange fluid from flowing through the air gap while maintaining cooling channels in the teeth, thus resolving the contradiction between heat dissipation and air friction loss reduction
Solution Approach 2:
The partition acts as an intermediary structure between the rotor and rotor pressing rings. Its outer edge extending into the air gap creates a barrier that guides heat-exchange fluid through the axial ventilation holes without allowing it to enter the air gap, thereby achieving both effective cooling and reduced air friction 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 enhances heat exchange efficiency and reduces air friction loss by ensuring that heat-exchange fluid primarily flows through the axial ventilation holes, maintaining a uniform thermal field and preventing heat-exchange fluid from entering the air gap, thus optimizing cooling performance.
Implementation Method 1
the heat of the teeth is dissipated through the coolant flowing through the circular ventilation holes
Implementation Method 2
an outer edge of the partition extends into the air gap... the air resistance effect is enhanced
Data Source
AI summary
A stator and a rotor are mounted inside a case of a permanent magnet motor, and separate the inner cavity of the case into a first inner cavity and a second inner cavity. An air gap is formed between an inner circle surface of the stator and an outer circle surface of the rotor. Axial ventilation holes in communication with the first inner cavity and with the second inner cavity are disposed in teeth of a stator core. The rotor comprises a rotor core and rotor pressing rings disposed in an axial direction at both sides of the rotor core. A partition is disposed between the rotor core and at least one of the rotor pressing rings. An outer edge of the partition extends into the air gap, thus enhancing the air blocking effect and realizing a higher cooling efficiency.