- Electric Motor & Generator Brushes
- Slip - Ring Brushes
- Shaft Grounding Brush Holders & Lightning Protection
- Constant Force Spring Assemblies

Electrical Data

DETERMINING THE BEST GRADE
The greatest challenge in carbon brushes is to supply a grade which will offer the best performance for the manner in which the motor or generator is operating. Consideration must be given to the actual running loads, the duty cycle, the voltage, the peripheral speeds and the environment. The SEW technical staff select the proper grade as required for your equipments.

The many different grades in use today are derived through variation in manufacturing process including raw materials, molding pressures, temperature and duration of the baking process, and after-treatments. All brush grades fall within the five categories of Carbon Graphite, Graphite, Electro graphite, Copper Graphite, and Silver Graphite Each material has been designed and developed to perform under certain operating conditions. There will be a best grade for each application, although several grades with similar characteristics may offer satisfactory performance.

Electrical Carbon Grade Detail & Application

Resin Bonded Carbon Graphite offer cleaning action for use at slow speeds, low current densities and medium to low voltages. 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. Grade Detail & its application

Natural Graphite is for use in special applications requiring the low friction characteristics of this material. When brushes must operate at very low current densities or very high peripheral speeds, a graphite grade should be used. Grade Detail & its application

Electro Graphite is the most common grades used on modern equipment with good performance at high voltages, high current densities and high speeds. There is a wide range of characteristics within this category. Most electro graphite grades are capable of handling overloads well. Grade Detail & its application

Copper Graphite has material contents of 15–95% copper or copper alloy. 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. Grade Detail & its application

Silver Graphite has material contents of 15–95% silver. 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. Grade Detail & its application

Style of carbon Brush (identification form)
The configuration of the carbon along with the method and location of the shunt connection determines the brush style. Due to the difficulty in describing the many different styles, refer to the style numbers located under each photograph. Form

Quick identification of Carbon Brush Form

Techical Support on Slip Rings

Technical Support on commutators

Technical Support on Commutator Patina

 

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