GIS Switch Driver with Cam Spline Feedback
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Solution Overview
Problem
In GIS switchgear, drivers struggle to precisely control moving contacts due to play and skewness in components, leading to inefficient power transfer and operational inconvenience, including safety risks for workers who must access distant drivers.
Innovation Solution
A driver system incorporating a motor, shaft, gear, cam spline, and micro-switch, where the motor is remotely connected to the gear, and the cam spline measures rotation angles to control the motor operation, minimizing the impact of component play and skewness, with an auxiliary switch for additional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver is located far from the switch, then the structure is more flexible and easier to install, but the moving contact control precision deteriorates due to play and skewness in components
Solution Approach 1:
The micro-switch provides feedback control by detecting the position of the cam spline and controlling the motor operation accordingly. This closed-loop control system compensates for play and skewness in the power transfer components, maintaining precise control of the moving contact even when the driver is located far from the switch.
Solution Approach 2:
The cam spline acts as an intermediary element between the gear and the micro-switch. It translates the rotational motion into a position-detectable form that the micro-switch can sense, enabling precise control without requiring direct coupling between the driver and switch.
2Area of stationary object
If the driver is mounted on the upper portion of the GIS, then the space utilization is improved, but the ease of operation deteriorates as workers must access the driver via ladder
Solution Approach 1:
The patent replaces manual mechanical operation with an automated motor-driven system. The motor automatically operates the switch mechanism based on micro-switch feedback, eliminating the need for workers to physically access and manually operate the driver located in hard-to-reach upper portions of the GIS.
3Device complexity
If play and skewness in components are present, then the device complexity is reduced, but the power transfer efficiency deteriorates
Solution Approach 1:
The micro-switch creates a feedback control system that monitors the actual position of the cam spline and adjusts the motor operation accordingly. This compensates for play and skewness in the power transfer components, ensuring efficient power transfer without requiring excessively tight tolerances in the mechanical components.
Data Source
AI summary
A driver for a switch in a GIS (Gas Insulation Switchgear) includes a motor, a shaft connected with a moving contact of the switch, a gear connected with one terminal of the shaft and configured to transfer power of the motor to cause the shaft to reciprocate the moving contact through the shaft, a cam spline combined with the shaft and spaced apart from the gear, and a micro-switch connected with the cam spline and configured to control an operation of the motor.