Electric Motor Stator Bar and Fill Channels for Uniform Potting
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Solution Overview
Problem
Existing electric motors, particularly transverse flux motors, face challenges in efficiently connecting electrical coils and routing potting compound, leading to potential gas pocket formation and uneven potting matrices, which can affect mechanical output and motor efficiency.
Innovation Solution
The design incorporates a stator bar with terminals, tabs, and a panel for electrical connections, and a potting compound routing system within the rotor and stator to ensure uniform potting and prevent gas pocket formation, using a stator fill channel and rotor fill channel to direct the potting compound effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coil connection methods are used, then electrical connectivity is achieved, but gas pocket formation occurs and potting matrix uniformity deteriorates
Solution Approach 1:
The patent introduces a stator bar as an intermediary component that consolidates multiple coil connections to a single terminal point. This mediator structure eliminates scattered wire ends and connection points that trap air, enabling uniform potting compound flow and preventing gas pocket formation while maintaining reliable electrical connectivity.
Solution Approach 2:
The patent segments the stator structure by separating the coil windings from the connection terminal through the stator bar. This segmentation allows the coil assembly to be potted as a unified structure without exposed wire ends, while the stator bar provides the necessary electrical connection interface, thus resolving the conflict between connectivity and potting uniformity.
2Reliability
If multiple connection points are used for coils, then electrical connectivity is improved, but device complexity and gas pocket risk increase
Solution Approach 1:
The patent merges multiple coil connection points into a single consolidated terminal through the stator bar. Multiple tabs on the stator bar connect to multiple coils, but all connections converge to one external terminal, simplifying the overall structure and eliminating the complexity of multiple exposed connection points while maintaining full electrical connectivity.
3Ease of manufacture
If potting compound is applied without routing channels, then application is simpler, but gas pocket formation and uneven distribution occur
Solution Approach 1:
The patent incorporates fill channels into the stator bar structure before the potting process. These pre-integrated channels provide designated pathways for potting compound flow, ensuring uniform distribution throughout the stator assembly and preventing gas pocket formation, while the channels themselves are formed as part of the stator bar manufacturing process.
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 design enhances electrical connectivity, reduces motor weight and cost, and ensures a uniform potting matrix, improving mechanical output and efficiency by preventing gas pockets and optimizing the distribution of potting compound.
Implementation Method 1
a stator bar extending along the axis and including a plurality of terminals, the stator bar electrically connecting the plurality of coils with the plurality of terminals
Implementation Method 2
Potting compound that embeds the stator at least partially fills the stator fill channel
Data Source
AI summary
An electric motor includes a rotor and a stator that includes a plurality of coils arrayed along a rotational axis of the rotor. The rotor is potted with potting compound. The stator is potted with potting compound. Each coil of the stator is electrically connected to a power source to receive operating power from the power source. The coils are powered to cause the stator to electromagnetically drive rotation of the rotor on the rotational axis.