Rotor Magnet Pocket Venting Channels for Bubble-Free Potting

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Solution Overview

Problem

The existing methods for potting magnets in electric machine rotors are complex and often result in undesirable hollow spaces or air bubbles, which impair the stability and balance of the rotor, especially at high rotational speeds.

Innovation Solution

The rotor design incorporates clearances delimited by magnets and the laminated core, with connection channels that allow for simultaneous potting of multiple clearances with a potting compound, ensuring secure adhesion and eliminating air bubbles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional potting methods are used to secure magnets in magnet pockets, then magnets are fixed in the laminated core, but the process becomes complex and hollow spaces or air bubbles remain in the laminated core

Engineering Contradiction:

Improvestability of magnet fixingVSAvoidpotting process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention segments the magnet pockets into multiple clearances (first clearance, second clearance, etc.) that are connected through connection channels. This segmentation allows the potting compound to be introduced through a single filling opening and distributed systematically throughout all clearances via the connection channels, simplifying the potting process while ensuring complete filling without air bubbles.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection channels act as intermediaries that connect the filling opening to multiple clearances. The potting compound flows through these intermediary channels to reach and fill all clearances uniformly, eliminating the need for multiple filling operations and ensuring complete infiltration without trapping air bubbles.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If multiple magnet pockets are potted separately to ensure complete filling, then each pocket is thoroughly filled with potting compound, but the potting process time increases significantly

Engineering Contradiction:

Improvecomplete filling of magnet pocketsVSAvoidpotting process time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The invention merges multiple separate potting operations into a single unified process. By connecting multiple clearances through connection channels that all lead to a common filling opening, the potting compound can be introduced once and simultaneously fill all clearances, dramatically reducing process time while maintaining complete filling of each magnet pocket.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connection channels enable continuous flow of potting compound from the filling opening through all clearances in a single uninterrupted operation. This continuous action ensures complete filling of all magnet pockets without stopping to reposition nozzles or perform multiple separate potting operations, thereby eliminating time loss while maintaining filling completeness.

Inventive Principle:

Principle #20Continuity of useful action

3Ease of manufacture

If air bubbles are trapped in the laminated core during potting, then the potting process is simplified, but the stability of magnet fixing is impaired and rotor imbalance occurs

Engineering Contradiction:

Improvesimplicity of potting processVSAvoidrotor balance and magnet stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention introduces a spatial dimension through connection channels that create a three-dimensional network connecting all clearances to a single filling opening. This dimensional arrangement allows potting compound to flow through multiple pathways simultaneously, ensuring complete infiltration of all clearances and evacuation of air bubbles, thereby maintaining rotor balance and magnet stability while keeping the process simple.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 simplifies and cost-effectively secures the magnets, maintaining the rotor's magnetic properties and preventing imbalance, ensuring stable and malfunction-free operation of the electric machine.

Implementation Method 1

The clearances can be potted with a potting compound, whereby the magnets are fixed in the laminated core, in particular adhesively bonded to the laminated core.

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20240413683A1Series connection of magnet pockets to improve and speed up the filling and ventilation process

Publication Date: 2024.12.12 VALEO EAUTOMOTIVE GERMANY GMBH

AI summary

A rotor for an electric machine includes a laminated core formed from stacked electrical laminations and having magnet pockets arranged therein, a plurality of magnets, of which at least one is inserted into each of the magnet pockets, and a plurality of clearances which are in each case delimited by the magnets inserted into one of the magnet pockets and by the laminated core. A first connection channel connects a first one of the clearances which is associated with a first one of the magnet pockets to a second one of the clearances which is associated with a second one of the magnet pockets. An electric machine may include such a rotor, and a vehicle may include such an electric machine.