Electric Motor Cooling Jacket With Vibration-Isolating Sealing
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Solution Overview
Problem
Existing cooling jackets for electric motors transfer vibrations from the stator core to the motor housing, leading to high levels of electromagnetic noise due to direct connections and friction welding between the cooling jacket and stator outer housing.
Innovation Solution
A cooling jacket configuration with a bearing housing cooling portion and stator cooling portion separated by O-rings, featuring a gap between the cooling jacket and stator outer housing, and non-contacting partition walls to reduce vibration transfer, along with a coolant guiding channel system that minimizes direct contact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling jacket is friction welded to the stator outer housing, then the coolant is sealed and does not leak, but the vibration from the stator core is transferred to the motor housing, causing high electromagnetic noise
Solution Approach 1:
The patent introduces an intermediary substance (sealing material or damping material) placed between the cooling jacket and stator outer housing. This intermediary prevents direct rigid contact, thereby blocking vibration transfer while maintaining coolant sealing. The sealing material acts as a mediator that decouples the mechanical vibration path while preserving the fluid seal function.
Solution Approach 2:
The patent employs flexible sealing elements (such as O-rings or elastic sealing rings) between the cooling jacket and stator outer housing. These flexible components provide sealing functionality while accommodating relative movements and reducing rigid mechanical coupling, thereby diminishing vibration transmission to the motor housing.
2Stability of the object's composition
If the cooling jacket is firmly connected to the stator outer housing, then structural stability is improved, but vibration transfer from stator core to motor housing increases
Solution Approach 1:
The patent uses flexible sealing and damping elements that provide sufficient structural stability while preventing rigid mechanical coupling. These flexible components maintain the positional stability of the cooling jacket relative to the stator outer housing but allow for vibration isolation through their elastic properties.
Solution Approach 2:
The patent employs composite structures combining rigid and flexible materials in the connection between cooling jacket and stator outer housing. The composite design provides both structural stability and vibration damping, where the rigid portion ensures stability while the flexible portion isolates vibrations.
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
Significantly reduces electromagnetic noise by damping and absorbing vibrations through O-rings and gaps, while maintaining effective coolant flow and sealing to prevent leakage.
Implementation Method 1
at least one O-ring is provided between the cooling jacket and the stator outer housing... for reducing transfer of vibration from the stator core to the stator outer housing
Implementation Method 2
Significantly reduces electromagnetic noise by damping and absorbing vibrations through O-rings and gaps
Implementation Method 3
a cooling jacket configuration with a bearing housing cooling portion and a stator cooling portion... featuring a coolant guiding channel system
Data Source
AI summary
A cooling jacket for an electric motor having a configuration for reducing electromagnetic noise comprises a stator outer housing substantially in the form of a hollow cylinder surrounding the cooling jacket which is also substantially in the form of a hollow cylinder; a stator core in the form of a hollow cylinder located inside the cooling jacket; and a rotor rotatably mounted inside the stator core. The stator outer housing has an end portion configured to form a bearing housing of the motor. The cooling jacket comprises a bearing housing cooling portion and a stator cooling portion; at least one O-ring between the cooling jacket and the stator outer housing, and at least one O-ring between the bearing housing cooling portion and the stator cooling portion; and a gap between the cooling jacket and the stator outer housing.