Brush Density Calculator

Use this tool to calculate the brush current density on slip rings or a commutator.

Brush Density Calculator | Cutsforth

Use this complimentary tool to calculate the brush current density for your brush excitation main field rings.

Basic

Advanced

Total Number of Current-Carrying Brushes *

Include all brushes on both polarities combined.
Value must be an even number. Exclude any insulated voltage monitoring brushes.

Must be an even number greater than 0.

Brush Thickness (Inches) *

Dimension in the same direction as the shaft's rotation.

Must be a positive number.

Brush Width (Inches) *

Brush dimension parallel to the shaft's axis.

Must be a positive number.

Also called 'Excitation Amps'. This is the normal operational field amps, typically found in the control room during normal operation.

Normal Operating Field Amps

Amps Per Square Inch (Normal)

—

A/in²

Amps Per Brush (Normal)

—

A/brush

This is NOT nameplate field amps. Taken from control room historical data. This is the value that is rarely exceeded.

Maximum Operating Field Amps

Amps Per Square Inch (Max)

—

A/in²

Amps Per Brush (Max)

—

A/brush

Use this section to include notes about the values above and they will be included on the complimentary PDF report available to download below.

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The Advanced calculator is coming soon.

Please fill in all required brush detail fields (number of brushes, thickness, and width) before results can be calculated.

Please fill in all fields before downloading.