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spring even if the brush flexible becomes disconnected, it is preferable to insulate the spring from the brush. This is achieved by fitting a non-conducting insert to the top of the brush where the spring bears upon it. Alternatively, Morgan Advanced Materials can provide fully-insulated spring assemblies. 7 TECHNICAL HANDBOOK} OPTIMUM FORCE C ...
The most important factors are: 1) maximum stability of the carbon in the holder, 2) proper positioning of the brush on the contact surface, and 3) minimum resistance through the brush and holder portion of the electrical circuit.
attention. The standard procedure for the adjustable force holders was to reduce the force until arcing was noticed and then adjust up to the next notch. Checking of spring force usually involved only the feel of the index finger under the spring arm. Literature suggested spring pressure of 2.0 to 2.5 PSI (140 to 175 g/cm2) for industrial machines.
Mersen recommends: For stationary electrical machines: 180 - 250 g/cm2 (2.56 - 3.56 psi) For electrical machines under heavy vibration (e.g. traction motors): 350 - 500 g/cm2 (5.00 - 7.11 psi) Equal spring pressure must be maintained for all carbon brushes to ensure a good current distribution.
The Optimus V-Type is a brush holder designed to attain balanced spring pressure, even current distribution between all brushes, and reduce carbon brush wear and tear by up to as much as 25%.
The Carbon Brush is fitted in a brush holder which is designed to hold it in the correct 2 position and allow the brush to run on the surface of the commutator or slip ring (collector) to transfer that currrent at optimum performance.
• Make sure that the brush-holder is in working condition and check the interior surface condition. • Adjust the distance between the brush-holder and commutator to range from 2.5 to 3 mm (Fig. 4). • Align the carbon brushes parallel to the commutator bars.
