How to Choose Suitable Constant Force Spring for Carbon Brush

Twin Coil Type

1. Width of carbon brush (A)
2. height of carbo brush (B) : Spring width must smaller than brush height
3. Wearing lingth of carbon brush (C) : Stroke must bigger than brush wearing length
4. Pressure between commutator and carbon brush (L) : The load of the spring
5. Mounting room of brush holders (E) and (F) : O.D. of spring (D) must smaller than both

Single Coil Type

1. Width of carbon brush (A) : O.D. (D) must smaller than Spring width (A)
2. Height of carbon brush (B) : Spring width must smaller than brush height
3. Wearing length of carbon brush (C) : Stroke must bigger than brush wearing length
4. Pressure on commutator : The load of the spring (L)