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Systematic Synthesis And Analysis Of Multi-DOF Toggle Mechanisms For Electrical Switches

Electronic Theses of Indian Institute of Science

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Title Systematic Synthesis And Analysis Of Multi-DOF Toggle Mechanisms For Electrical Switches
 
Creator Deb, Manan
 
Subject Electric Switches
Toggle Switches
Double Toggle Switching Mechanisms
Electric Switch Gear
Multiple Toggle System
Novel Double Toggle Switch
Electrical Switching Performance Improvement
Multi-DOF Toggle Mechanisms
Switching Performance Improvements
Electromechanical Switch
Switching Mechanisms
Electrical Engineering
 
Description Electrical switches are ubiquitous. Performance requirement for a switch is stringent. The operating mechanism mostly decides the performance of an electromechanical switch. However, design of such mechanisms, which involve discontinuous motions, is not much addressed in literature. The present work proposes a systematic procedure to design and analyze toggle based switching mechanisms.
The work defined the toggle phenomenon rigorously, and, based on the behaviour of the toggles, provided a classification scheme for the switch mechanisms. The existing switches fall in two major categories viz., single-toggle and double-toggle switches. The double toggle mechanism is more suitable for high power breaking as it can isolate the system’s behaviour from the operator’s behaviour. The kinematic and geometric attributes of the operating mechanism which affect the toggle sequence and timings have been identified. A systematic simulation based study has been performed to identify the influence of different kinematic and dynamic parameters on the functionality of a double toggle switching mechanism. The influence of the variable moment of inertia and mechanism singularities arising out of introduction of the four bar sub chain on the performance of the system have been studied in detail. It is observed that the performance of the double toggle systems is less susceptible, though not immune to the user behaviour; in extreme scenarios the switching performance could become erratic. The use of an additional spring in an existing system enhanced the system performance; but, connecting the main spring with the coupler link altered the system performance more dramatically. Thus it established that the influence of the kinematic configuration on the performance of a switching mechanism is more pronounced than the dynamic characteristics of a comparable system.
For the ab initio design of double toggle switching mechanisms, necessary structural criteria for a mechanism to exhibit double toggle phenomenon have been identified and verified with various 2 d.o.f. systems. It is also established that any double toggle mechanism cannot be used directly as a switching mechanism; the link dimensions, link arrangements and the stopper locations have to be chosen properly. Towards that end, three necessary kinematic criteria for a switching mechanism are identified. A few mechanisms which satisfy all structural and kinematic criteria are identified; the switching and toggle behaviour of these mechanisms are examined through simulations using Pro/Mechanism. Finally, considering all the conditions a
is constructed with consideration of mass and geometric shape of the links. Thus, it established that the proposed methodology can systematically generate novel, structurally distinct electrical switches.
 
Contributor Sen, Dibakar
 
Date 2015-12-07T11:31:11Z
2015-12-07T11:31:11Z
2015-12-07
2012-01
 
Type Thesis
 
Identifier http://etd.iisc.ernet.in/handle/2005/2494
http://etd.ncsi.iisc.ernet.in/abstracts/3221/G25442-Abs.pdf
 
Language en_US
 
Relation G25442