Actively Cooled Bearing Shield for Synchronous Machine Heat Dissipation
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Solution Overview
Problem
High-performance synchronous machines face challenges with heat dissipation, particularly in electrically active components like the energy transmitter and power electronics, leading to increased structural complexity and susceptibility to failure.
Innovation Solution
The design incorporates an actively cooled bearing shield with a coolant duct system that effectively dissipates heat generated during energy transmission, utilizing a ferrite core to enhance electromagnetic coupling and heat transfer to the coolant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods (cooling jacket in stator housing) are used, then heat dissipation is provided, but structural complexity increases and installation space requirement increases
Solution Approach 1:
The patent combines the bearing shield with cooling functionality by integrating a coolant duct directly into the bearing shield structure. This merging of the bearing function and cooling function eliminates the need for separate cooling components, thereby reducing structural complexity while maintaining effective heat dissipation for the energy transmitter.
Solution Approach 2:
The patent utilizes the axial dimension of the bearing shield to incorporate the coolant duct, allowing cooling functionality to be added without increasing the radial or circumferential footprint. This dimensional approach enables effective cooling while minimizing installation space requirements.
2Temperature
If cooling systems are added to dissipate heat, then heat dissipation improves, but device complexity increases
Solution Approach 1:
The cooling system is merged with the bearing shield structure, making the bearing shield itself the cooling component. This integration eliminates the need for separate cooling system components, thereby reducing overall device complexity while providing effective heat dissipation for the energy transmitter.
Solution Approach 2:
The bearing shield serves dual functions: mechanical support (bearing) and thermal management (cooling). By making the bearing shield self-sufficient for both functions, the patent eliminates the need for additional dedicated cooling components, reducing system complexity.
3Temperature
If vulnerable components are relocated to reduce heat transmission, then heat dissipation improves, but structural complexity increases and installation space increases
Solution Approach 1:
The patent merges the energy transmitter with the cooled bearing shield structure, allowing the energy transmitter to be positioned in thermal contact with the coolant duct. This integration enables effective heat dissipation without requiring separate mounting structures or complex thermal management arrangements.
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 approach improves heat dissipation efficiency, reduces the complexity of cooling systems, and increases power density, thereby enhancing the reliability and performance of synchronous machines.
Implementation Method 1
The bearing shield (6) is equipped with at least one coolant duct (23), comprising a coolant inlet (24) and comprising a coolant outlet (25), so that the bearing shield (6) can be actively cooled by means of a, preferably liquid, coolant, which is guided through the coolant duct (23)
Implementation Method 2
The rotor (3) has a rotor shaft (9) rotatably mounted at least on the bearing shield (6) about an axis of rotation (10) and a coil (11) for generating a magnetic rotor field
Implementation Method 3
The synchronous machine is preferably designed as traction motor for a motor vehicle
Data Source
AI summary
An electrically excited synchronous machine, comprising a stator having a stator housing with at least one axial end-face bearing shield and a stator coil for generating a magnetic stator field, a rotor having a rotor shaft rotatably supported at least on the bearing shield about a rotational axis and a rotor coil for generating a magnetic rotor field, and an energy transmission system having an energy transmitter for transmitting electric energy to the rotor coil, wherein the bearing shield contains at least one coolant channel and has a coolant inlet and a coolant outlet such that the bearing shield is actively cooled by a coolant conducted through the coolant channel, and the energy transmitter has at least one component fixed to the stator and arranged in or on the bearing shield so as to transfer heat.