Motor Brush / Twin Springs
Enhancing Motor Performance

Motor brush springs are Conforce springs that are specially constructed to provide the ideal method of ensuring consistent, dependable lubrication to electric motor commutators.

Because there are a number of different spring design possibilities for a given application it is suggested that you consult with a Vulcan engineer early in the design phase. The tables in this section are only a guide; they do not list stock springs.

The following parameters affect the spring design:
Material - Typically Type 301 stainless steel, but other materials are required if current is to be carried through the spring.

Force - The force of the spring should be equal to the spring force required to obtain the desired brush pressure. Normal tolerance is +/- 10%.

Available Space - for any given force there are several combinations of spring thickness and width. Select the one that best fits the available space.

Mounting Methods - select MOUNTING METHODS to view a selection of mounting recommendations.

Length - include two full turns extra when the spring is fully extended, based on the length of the brush when new.

Configuration -

• Straight extension spring/a single spring
• Laminated Springs/multiple interwound springs
• Twin coil springs/doubles the load of a single spring

Clearance - start with ten times the thickness of the spring.