On-load tap changer emergency drive mechanism
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Solution Overview
Problem
Existing on-load tap changers lack a simple, reliable, and ergonomic method for setting a defined switching position during manual emergency operation, which can be damaging and inefficient.
Innovation Solution
The on-load tap changer incorporates a transmission shaft with formed teeth, an extension for tool attachment, and a protective cap that acts as a safety cutoff switch, allowing manual emergency operation without disassembling the electric motor, with adjustable rotary-speed changing means to optimize torque and revolutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual emergency drive is implemented by disassembling the electric motor, then access to the transmission shaft is achieved, but device complexity and ease of operation are worsened due to disassembly requirements
Solution Approach 1:
The invention extracts the transmission shaft from the electric motor assembly by providing a separate drive interface on the motor housing that directly accesses the transmission shaft. This allows the transmission shaft to be operated independently without disassembling the electric motor, resolving the contradiction between accessibility and device complexity
Solution Approach 2:
The invention introduces an intermediary coupling mechanism between the electric motor and transmission shaft, where a drive interface on the motor housing serves as a mediator that allows external tools to transmit torque to the transmission shaft without requiring motor disassembly. This intermediary structure enables independent access while maintaining system integrity
2Ease of operation
If the transmission shaft is directly exposed for manual operation, then ease of operation is improved, but reliability is worsened due to risk of damage and safety hazards
Solution Approach 1:
The invention provides beforehand protection by enclosing the transmission shaft in a protective housing with a specifically designed drive interface. This pre-established protective structure prevents direct exposure to damaging elements while maintaining controlled accessibility through the designed interface, resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The protective housing serves as an intermediary structure that mediates between the external environment and the transmission shaft. It provides a controlled interface for manual operation while protecting the transmission shaft from damage, thus maintaining both ease of operation and reliability
3Reliability
If the transmission shaft is enclosed in a protective housing, then reliability is improved by preventing damage, but ease of operation is worsened due to reduced accessibility
Solution Approach 1:
The invention applies local quality by providing a protective housing that encloses the transmission shaft while creating a localized drive interface with specific geometric features (such as hexagonal recesses or splines). This localized interface provides targeted accessibility for manual operation while maintaining overall protective enclosure, resolving the contradiction between reliability and ease of operation
Solution Approach 2:
The drive interface structure acts as an intermediary element that bridges the protective housing and the transmission shaft. It provides a controlled access point within the protective enclosure, allowing manual operation while maintaining the protective function, thus resolving the contradiction between protection and accessibility
4Manufacturing precision
If fixed rotary-speed changing means are used in the transmission, then manufacturing precision is improved, but adaptability is worsened due to inability to adjust torque and revolutions
Solution Approach 1:
The invention transforms the fixed rotary-speed changing means into a dynamic, adjustable system. The transmission includes variable gear ratios or adjustable speed-changing mechanisms that can be modified during operation to adapt to different torque and revolution requirements, resolving the contradiction between manufacturing precision and adaptability
Solution Approach 2:
The invention enables parameter changes in the transmission system by providing adjustable gear ratios or variable speed-changing mechanisms. This allows the rotary-speed changing means to be adapted to different operational requirements while maintaining precise control, resolving the contradiction between fixed manufacturing precision and operational adaptability
Data Source
AI summary
The invention relates to an electric motor-operated on-load tap changer (1) comprising an emergency drive. An electric motor (3) and a power store (13) of said on-load tap changer (1) are mechanically coupled by means of a gear (5) that is provided with a gear housing (90). The gear (5) comprises a gear shaft (61) on which a toothing (55) is designed. For manual emergency operation, the claimed gear shaft (61) has an extension (62) which comprises a free end (65) for attaching a tool (95). The invention also relates to a method for adjusting a defined switching position of an on-load tap changer (1) when in an emergency operation mode.