Electrical Contacts, 2nd Edition

20

Sliding Electrical Contacts (Graphitic Type Lubrication)

Kiochiro Sawa and Erle I. Shobert II

Let the world slide, let the world go

Be Merry Friends, John Heywood

CONTENTS

20.1    Introduction

20.2    Mechanical Aspects

20.2.1    Hardness

20.2.2    Friction and Wear

20.2.3    Tunnel Resistance and Vibration

20.3    Chemical Aspects

20.3.1    Oxidation

20.3.2    Moisture Film

20.4    Electrical Effects

20.4.1    Constriction Resistance

20.4.2    Film Resistance

20.4.3    Fundamental Aspects of Commutation

20.4.4    Equivalent Commutation Circuit and DC Motor Driving Automotive Fuel Pump

20.4.5    Arc Duration and Residual Current

20.5    Thermal Effects

20.5.1    Steady State

20.5.2    Actual Temperature

20.5.3    Thermal Mound

20.6    Brush ...