Modular Motor Drive Cabinet for On-Load Tap-Changers
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Solution Overview
Problem
Electric motor drive units for on-load tap-changers are complex and costly, with high production and assembly costs due to custom design requirements, leading to long lead times and limited flexibility for late order changes.
Innovation Solution
A modular motor drive cabinet with a sealed environment for climate control, featuring a standard three-phase electric motor, gearbox, position transmitter, user interface, and control unit with CAN bus signaling, allowing for adaptable power supply and configuration, reducing production and testing time through configurable I/O ports and eliminating the need for contactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If custom-designed electric motor drive units are used for on-load tap-changers, then the drive unit can meet specific customer requirements, but the production and assembly costs increase significantly
Solution Approach 1:
The patent applies universality by designing a standardized motor drive unit platform that can serve multiple customer requirements through configurable components. The control unit can be programmed for different applications, I/O ports can be selected based on needs, and the basic mechanical structure remains the same. This allows a single standardized design to fulfill various custom requirements without requiring complete custom design for each order, thereby reducing production and assembly costs while maintaining adaptability.
Solution Approach 2:
The patent segments the motor drive unit into modular components: a standardized base structure, configurable control unit, selectable I/O ports, and optional accessories. This segmentation allows customers to configure only the necessary components for their specific application, reducing unnecessary customization costs. The modular approach enables standardized manufacturing of common parts while allowing customization only where required, resolving the contradiction between adaptability and manufacturing ease.
2Adaptability or versatility
If custom-designed electric motor drive units are used for on-load tap-changers, then the drive unit can be tailored to specific applications, but the lead time for production increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring standardized components and control unit software templates that can be quickly adapted to different customer requirements. The control unit comes with pre-programmed functions that can be modified for specific applications, and the mechanical components are pre-assembled in standardized configurations. This preliminary preparation of modular components and control logic significantly reduces the time required to customize and produce motor drive units for different on-load tap-changer applications.
3Manufacturing precision
If order-specific design is used for motor drive units, then customer requirements are met precisely, but flexibility for late order changes is reduced
Solution Approach 1:
The patent applies dynamics by designing a control unit with reconfigurable parameters and I/O ports that can be adjusted even after production has begun. The control software allows for parameter modification and reconfiguration based on late order changes, and the modular I/O port selection can be adapted without requiring complete redesign. This dynamic reconfigurability maintains precision in meeting customer requirements while providing flexibility to accommodate late order changes.
Data Source
Figure 1~2
AI summary
The present invention relates to a motor drive cabinet (2) in an on-load tap-changer, comprising an electric motor drive unit and a control unit (12). The electric motor drive unit comprises an electric motor (6), a gearbox (7) and a position transmitter (9), wherein said control unit (12) is arranged to control an outgoing axis (3) outgoing from said motor drive cabinet (2) by feeding said electric motor (6) through direct connection to drive said outgoing axis (3) through said gearbox (7), and wherein said position transmitter (9) is arranged to detect movement and position of said outgoing axis (3) and to provide indications thereof to said control unit (12), and wherein said motor drive cabinet (2) is sealed during use with said electric motor drive unit and control unit (12) within that sealing.