Tooth Head Ring and Wall Element for Coolant-Sealed Electric Machines
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Solution Overview
Problem
Existing electric machines face challenges in efficiently operating with high performance coefficients due to coolant leakage and magnetic flux losses, particularly in varying load conditions.
Innovation Solution
The introduction of a tooth head ring in the annular gap between the stator and rotor, combined with a wall element, seals the stator against the rotor, optimally guides magnetic flux, and allows adjustable relative positions to enhance efficiency in both full-load and partial-load operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sleeve-like wall element is arranged in the annular gap to prevent coolant leakage, then coolant sealing is improved, but device complexity increases due to the additional component
Solution Approach 1:
The wall element is integrated with the tooth head ring to form a single combined component. The tooth head ring serves dual purposes: guiding magnetic flux and providing structural support for the wall element that prevents coolant leakage. This merging eliminates the need for separate components while maintaining both functions.
Solution Approach 2:
The tooth head ring is designed to perform multiple functions simultaneously: it guides magnetic flux in the air gap and serves as a mounting structure for the wall element that seals coolant. This multi-functionality reduces the overall number of components needed in the electric machine.
2Reliability
If the wall element is positioned between the tooth head ring and stator laminated core, then coolant leakage prevention is improved, but manufacturing precision requirements increase
Solution Approach 1:
The wall element is designed as a thin, flexible component that can adapt to slight variations in manufacturing tolerances. This flexibility allows it to maintain effective sealing even when there are minor deviations in the positioning of the tooth head ring or stator laminated core, thereby reducing the stringency of manufacturing precision requirements.
3Loss of energy
If the tooth head ring is used to guide magnetic flux, then magnetic flux losses are reduced, but device complexity increases due to additional structural components
Solution Approach 1:
The tooth head ring is merged with the wall element structure, creating a single component that performs both magnetic flux guidance and coolant sealing support functions. This integration reduces the number of separate parts while achieving both objectives of reducing energy loss and maintaining simple device architecture.
Solution Approach 2:
The tooth head ring is designed as a multi-functional component that simultaneously guides magnetic flux to minimize energy losses and provides structural support for the coolant sealing wall element, thereby reducing overall device complexity despite its enhanced functionality.
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 configuration enables efficient operation with high performance coefficients by preventing coolant leakage and minimizing magnetic flux losses, allowing optimal torque generation and reduced intrinsic losses across different load conditions.
Implementation Method 1
the wall element seals the stator against the rotor such that, proceeding from the stator via the annular gap and the tooth head ring, no coolant moves towards the rotor
Implementation Method 2
a tooth head ring arranged in the annular gap, a respective recess of the tooth head ring being arranged between two tooth heads of the tooth head ring that are arranged adjacent to one another in a circumferential direction of the tooth head ring
Implementation Method 3
a stator laminated core, wherein grooves are introduced into the stator lamination, in which stator windings are accommodated. The grooves of the stator laminated core are open radially inwardly, facing the rotor
Data Source
AI summary
An electric machine includes a housing, a rotor including a rotor shaft and a rotor laminated core, and a stator including a stator laminated core with grooves in which stator windings are received, through which a coolant can flow, and wherein a respective tooth of the stator laminated core is arranged between two respective grooves arranged adjacent to one another in a circumferential direction. An annular gap is included between the rotor and stator laminated cores and a tooth head ring arranged in the annular gap, a respective recess of the tooth head ring arranged between two tooth heads of the tooth head ring arranged adjacent to one another in a circumferential direction of the tooth head ring. A wall element is arranged in the annular gap and seals the stator against the rotor such that, from the stator via the annular gap, no coolant moves towards the rotor.