Inverter Lower Frame Local Quality Non-Magnetic Material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing inverter devices with stainless steel lower frames are costly due to the use of non-magnetic materials to prevent heating and vibration from overcurrents, leading to increased manufacturing expenses.
Innovation Solution
The inverter device incorporates a lower frame with frame members forming a cuboid structure, where only the edge frame members through which the output relay bar passes are made of non-magnetic materials, such as stainless steel, while the rest are made of sheet metal, reducing material costs without compromising heat management and vibration control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all frame members of the lower frame are made of non-magnetic body (stainless steel), then heating and vibration due to overcurrent are prevented, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by making only the frame members that directly contact or are close to the output relay bar (which carries high current) from non-magnetic material, while other frame members can be made from magnetic material. This localized application of non-magnetic material prevents heating and vibration at the critical location without requiring the entire lower frame to be expensive non-magnetic material, thus resolving the contradiction between reliability and manufacturing cost.
2Reliability
If non-magnetic materials are used for the lower frame, then overcurrent protection is achieved, but material cost increases
Solution Approach 1:
The patent reduces the quantity of non-magnetic material by applying it only where overcurrent protection is critically needed - specifically to frame members in close proximity to the output relay bar - while allowing magnetic materials to be used for other frame members. This selective material application maintains overcurrent protection functionality while significantly reducing the total amount of expensive non-magnetic material required.
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 effectively prevents heating and vibration due to overcurrents while significantly reducing manufacturing costs by using less expensive materials for the frame members.
Implementation Method 1
a frame member of the plurality of frame members that is configuring one edge of a four-peripheral frame, wherein the output relay bar passes through the four-peripheral frame, is formed of a non-magnetic body
Implementation Method 2
preventing heating and vibration due to the occurrence of an overcurrent
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An inverter device includes an inverter stack 10 having casters 10a on a bottom portion thereof and a switchboard 50 in which the inverter stack 10 is housed by being entered from the front, the inverter stack 10 having an output relay bar 73 linking an output terminal of the inverter stack and an output relay terminal 53 that configures a switchboard 50, and to which an output wire 55 connected to a load is attached, and a lower frame 20 configuring a bottom portion and formed of a plurality of frame members 21 linked so as to form the sides of a cuboid, wherein the lower frame 20 is such that frame members 21 configuring one side of a four-sided frame through which the output relay bar 73 passes are formed of a non-magnetic body.