![]() The NUMBER ONE reason for increased brush wear that we see is from low spring pressure! Inadequate spring pressure can cause rapid electrical brush wear. However, we’ve seen that, more often than not, the brush grade is not the culprit. A natural answer to this question that many will quickly jump to is the carbon brush grade. There isn’t one easy answer to this question, as each situation can be different. Rapid brush wear is a problem that can be caused by a multitude of factors. Lastly, for final wear in operate the DC machine at no load.įor specifics to your application, please contact Helwig Engineering to diagnose your brush wear problem.Now, seat the brush with commutator garnet paper.Connect the terminals, make sure your connections are tight and secure.This makes sure the brush moves freely in the holder. After applying the spring, pull up on the brush and release gently. #Brush pilot installInstall new brushes into the holders, paying attention to the orientation of angle holder designs.Use a dry untreated canvas or rubber abrasive. If the replacement brushes are made from a different grade of material, you will need to remove any old film from the brush tracks.Check the spring force of current springs with a Helwig Digi-Scale and make sure they are within the recommended range.Now, secure holders to the mount by checking for tightness, proper alignment.Check the inside of the holder cavity for dust, dirt, carbon build-up or burned areas.Inspect the commutator for any unusual conditions as described in the Helwig Carbon Commutator Condition Guide.Remove the old brushes and inspect (take note of unusual conditions of the brush or brush holders).Start by disconnecting the power of the machine with the approved lockout procedures.The proper way to install a brush in a DC electric motor is: The added conductivity and lower voltage drop of the metals allows metal graphite brushes to perform well at very high current densities and low voltages. Copper graphites have material contents of 15-95% copper or copper alloy.Helwig’s electrical brushes are made from low friction, conductive carbon materials that include natural graphite, carbon graphite, silver graphite, copper graphite, and electro graphite. The added conductivity and lower voltage drop of the metals allow metal graphite brushes to perform well at very high current densities and low voltages.įor more information about materials and brush grades, please visit our Grade Information page. 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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