The Effect of Various Operating Conditions Upon Electrical Brush Wear and Contact Drop PDF Download
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Author: Victor Peter Hessler Publisher: ISBN: Category : Brushes, Electric Languages : en Pages : 576
Book Description
The results of previous investigations of electrical brush wear and contact drop are presented and the theories of the sliding contact are checked against these early investigations. There are practically no quantitative data concerning electrical brush wear in the literature, and no theories of the mechanism of electrical brush wear were found. Apparatus and a method of procedure were developed for obtaining reasonably consistent electrical brush wear measurements. All measurements were made upon sliprings sine it was desired to eliminate as many variables as possible. Humidity and temperature conditions were held constant at all times except when varied purposely to determine their effects upon brush wear. Direct current was used for all except one brief series of tests. The effects of humidity, brush pressure, ring speed, brush circuit potential and current density upon electrical brush wear were investigated. Tentative conclusions are drawn concerning the effect of each of the above factors upon electrical brush wear and contact drop. A new theory of the sliding contact based on the negative temperature coefficient of resistancy of copper oxide is proposed. A bibliography is included for the convenience of those who wish to consult the original articles from which citations have been made.
Author: Victor Peter Hessler Publisher: ISBN: Category : Brushes, Electric Languages : en Pages : 576
Book Description
The results of previous investigations of electrical brush wear and contact drop are presented and the theories of the sliding contact are checked against these early investigations. There are practically no quantitative data concerning electrical brush wear in the literature, and no theories of the mechanism of electrical brush wear were found. Apparatus and a method of procedure were developed for obtaining reasonably consistent electrical brush wear measurements. All measurements were made upon sliprings sine it was desired to eliminate as many variables as possible. Humidity and temperature conditions were held constant at all times except when varied purposely to determine their effects upon brush wear. Direct current was used for all except one brief series of tests. The effects of humidity, brush pressure, ring speed, brush circuit potential and current density upon electrical brush wear were investigated. Tentative conclusions are drawn concerning the effect of each of the above factors upon electrical brush wear and contact drop. A new theory of the sliding contact based on the negative temperature coefficient of resistancy of copper oxide is proposed. A bibliography is included for the convenience of those who wish to consult the original articles from which citations have been made.
Author: Ragnar Holm Publisher: Springer Science & Business Media ISBN: 3662066882 Category : Technology & Engineering Languages : en Pages : 503
Book Description
This book is a completely revised and rewritten edition of "Electric Contacts Handbook" published in 1958. A large number of new in vestigations are considered, and many of the basic theories are revised in detail and even in general. The body of information had to be limited as it was not advisable to increase the volume of the book. In particular, no attempt was made to cover all of the practical applications. They appear as examples following concentrated explanations of basic phenomena. As in several branches of technology, the solutions of problems ari sing in the field of electric contacts involve insight into various disci plines of physics. It is feit that reviews of some of those topics, especi ally adapted to electric contact phenomena, are welcome to many readers. For example, chapters have been devoted to the structure of carbon, the band theory of electric conduction in solids, certain pro blems in statistics, and the theory of the electric arc. As regards arc problems, new ideas have been introduced. In order to make the main text less cumbersome, such reviews are presented as appendices. Throughout this edition, the mksa-unit system is used in accord with the latest recommendation for standardization of units in scientific and technical writings. The chapter "History of Early Investigations on Contacts" forming Part IV in the preceding edition of 1958 has not been repeated in this book.
Author: Victor Peter Hessler
Author: Victor Peter Hessler
Author: Victor Peter Hessler
Author: Victor Peter Hessler
Author: Permanent International Association of Road Congresses
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Author: United States. Bureau of Mines. Technical Library, Pittsburgh
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Author: Ragnar Holm
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Author: