Laminated Stator Core Pin Assembly for Cooling and EMC Contact
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Solution Overview
Problem
Existing electric machines, such as electric motors for fans, face challenges in efficiently cooling the stator and rotor due to heat generation, which can impair operation and lead to electromagnetic interference issues.
Innovation Solution
The implementation of guiding pins fixed to a carrier that pass through associated guides of a laminated core, where the lamination openings have projecting teeth for reliable thermal and electrical contact, allowing for effective heat dissipation and electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator is fixed to the carrier using screw connections, then the positioning is reliable, but the manufacturing process is complex and time-consuming
Solution Approach 1:
The invention extracts the fastening function from the screw connections and integrates it into the pin-guide system. The pins are inserted through guides in the laminated core into recesses in the carrier, eliminating the need for separate screw fasteners and simplifying the assembly process while maintaining reliable positioning.
Solution Approach 2:
The invention merges the positioning and fastening functions into a single integrated system. The guides in the laminated core and pins work together as a unified mechanism that both positions the stator relative to the carrier and secures it in place, replacing the separate positioning and screw fastening operations.
2Temperature
If the pins are in continuous contact with the laminated core, then the thermal dissipation is improved, but the risk of damage to the laminated core increases
Solution Approach 1:
The invention segments the contact between the pin and laminated core into discrete contact points through the teeth on the pin. Instead of continuous contact along the entire pin length, the teeth provide localized contact zones that distribute mechanical stress while maintaining thermal conduction paths from the laminated core to the pin.
Solution Approach 2:
The invention applies local quality by creating zones of high contact (teeth areas) and zones of reduced contact (clearance segments) along the pin length. The teeth provide localized thermal conduction and electrical contact, while the clearance segments reduce overall mechanical stress on the laminated core, protecting it from damage.
3Reliability
If the teeth project radially inward to contact the pin, then the thermal and electrical contact is reliable, but the manufacturing precision requirements increase
Solution Approach 1:
The invention incorporates clearance segments between the teeth and along the pin-guide interface that act as mechanical cushions. These clearances allow for minor manufacturing variations and assembly tolerances without compromising the reliability of contact at the tooth-pin interface, reducing the stringency of manufacturing precision requirements.
4Temperature
If the laminated core is pressed onto the pins to establish contact, then the thermal dissipation is improved, but the forces required increase
Solution Approach 1:
The invention uses partial action by applying pressing force only in the regions where teeth contact the pin, rather than requiring uniform pressure along the entire pin length. The clearance segments allow the laminated core to be positioned without excessive force, while the tooth contact zones provide sufficient thermal and electrical connection.
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 solution ensures reliable thermal dissipation and electromagnetic compensation, improving the operation and compatibility of the electric machine while reducing the risk of damage to the laminated core and simplifying the manufacturing process.
Implementation Method 1
The projecting teeth result in reliable thermal and electrical contact between the laminated core and the respective pin, so that heat is reliably transported away from the laminated core and thus from the rotor via the pins, and the rotor is thus reliably cooled.
Implementation Method 2
The reliable contact between the laminated core and the pins further results in the laminated core and the pins being electrically equipotential. As a result, there is improved compensation of unwanted electromagnetic interference.
Data Source
AI summary
An electric machine may include a rotor rotatable about a motor axial direction, a stator including a laminated core with axially successive laminations, a carrier to which the stator is fixed, and at least two pins disposed spaced apart in a motor circumferential direction. The pins may be fixed to the carrier. The laminated core may include, for a respective pin, an associated guide through which the respective pin passes. The associated guide may have an associated lamination opening in at least a part of the laminations. The respective pin may be in contact with at least some of the laminations in an axial contact section. In the contact section, at least some of the lamination openings may have at least one tooth projecting radially inwardly. A respective tooth may extend circumferentially over a tooth segment such that an adjoining gap segment is free of teeth.