![]() ![]() ![]() ![]() Copper graphites have material contents of 15-95% copper or copper alloy.The added conductivity and lower voltage drop of the metals allow metal graphite brushes to perform wellĪt very high current densities and low voltages. Silver graphites have material contents of 15–95% silver.Most electrographite grades are capable of handling overloads well. There is a wide range of characteristics within this category. Electrographites are the most common grades used on modern equipment with good performance at high voltages, high current densities and high speeds.These grades were developed early in the history of motors and generators and are therefore found most often on older equipment, particularly with flush mica commutators. Carbon Graphites offer cleaning action for use at slow speeds, low current densities and medium to low voltages.When brushes must operate at very low current densities or very high peripheral speeds, a graphite grade should be used. Graphites are for use in special applications requiring the low friction characteristics of this material.Manufacturers give each unique composition a designation called a brush “grade” See Helwig Gradesĭescriptions of the types of brush grades: The final composition of the raw material. ![]()
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