Sealed Choke Assembly for Motor Drive Environmental Protection
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Solution Overview
Problem
Power electronic devices, such as motor drives, face challenges in protecting chokes from environmental factors like dust and water, which can lead to electrical failure due to exposure during cooling processes.
Innovation Solution
A choke configuration is developed with a sealed container holding the inductor coil, allowing it to be disposed around a magnetic core while preventing external environmental exposure, using a container made from non-conductive materials like polyethylene terephthalate, and filled with potting material for additional protection and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the choke is deployed within the cooling channel to make efficient use of space, then the space utilization is improved, but the choke becomes exposed to dust and water in harsh environments
Solution Approach 1:
The inductor coil is disposed about the magnetic core in a nested configuration where the coil surrounds the core. This nesting arrangement allows the choke to be compact and efficiently utilize the cooling channel space while the entire assembly can be protected by the container structure from environmental factors.
Solution Approach 2:
A container made from non-conductive material is introduced as an intermediary structure that holds both the magnetic core and inductor coil. This container acts as a mediator that provides mechanical support and environmental protection while allowing the choke to maintain its compact nested configuration within the cooling channel.
2Temperature
If the cooling channel is exposed outside the equipment cabinet for heat dissipation, then the cooling efficiency is improved, but the choke becomes subject to environmental damage
Solution Approach 1:
A flexible or rigid container structure is used to enclose the choke components (magnetic core and inductor coil). This shell provides a protective barrier that allows the cooling channel to be exposed for efficient heat dissipation while the container protects the choke from dust, water, and other environmental factors that could cause electrical failure.
3Device complexity
If the inductor coil is disposed about the magnetic core for compact configuration, then the device complexity is reduced, but the assembly becomes difficult to manufacture
Solution Approach 1:
The magnetic core is prepared in advance with protrusions that extend beyond the ends of the container. The inductor coil is then disposed about this pre-positioned core, and the container is formed around the assembly. This preliminary positioning of the core simplifies the subsequent coil winding and container formation processes, making the overall assembly more manufacturable despite the nested configuration.
Solution Approach 2:
The choke assembly is segmented into distinct components: the magnetic core, the inductor coil, and the container. The core is formed separately with specific protrusions, the coil is wound around it, and then the container is formed to enclose the assembly. This segmentation allows each component to be manufactured and prepared independently before final assembly, reducing the difficulty of manufacturing the compact nested configuration.
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
The solution effectively protects the choke from dust and water, reducing the risk of electrical failure, enhancing the safety and durability of the motor drive unit, and allowing for efficient heat dissipation, thus enabling the motor drive unit to be mounted with the cooling channel exposed to harsh environments.
Implementation Method 1
The container is filled with a potting material
Implementation Method 2
filled with potting material for additional protection and thermal conductivity
Data Source
AI summary
An improved choke assembly for a power electronics device is provided. More specifically, a choke assembly with improved protection from environmental conditions such as dirt and water is provided. An improved choke assembly may include an insulative housing for an inductor coil that seals the inductor coil from the environment.