White Paper-4 August, 2010 Significant Improvement with Optimum Brush Design Situation: A global atmospheric sciences company complained about short brush life on OEM Servo motor brush. Helwig Carbon was called on to find a replacement for the original brush that was dusting away rapidly within few hours. Environment around motor is dusty and hot most of the time. Application: Two motors are used to turn the Radar Antenna which is 15 feet in diameter. The motor turns continuously in clockwise direction. Servo Motor Specs: 4 pole motor, 19.5 v, 1.9 Amps, 3150 RPM Analysis: Helwig engineers analyzed the situation and found the root cause for brush wear. New brush was designed with Helwig grade H670 with a new spring. Results: ? The OEM brushes lasted only 40 h

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