Brake Torque Calculator

Size brakes for Hoist, Cross Travel, and Long Travel motions.

1. Hoist Parameters

Ton

kg

mm

: 1

%

2. Motor & Safety

kW

RPM

kg·m²

Calculation Result

HOIST BRAKE

Load Torque: 0.0 Nm
Motor Torque: 0.0 Nm
Required Braking Torque
0.0 Nm
Safety Factor: --
Includes efficiency & safety margins

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Understanding Brake Torque Calculation

Braking is one of the most critical safety aspects of an EOT crane. This calculator helps you determine the required braking torque for Hoist, Cross Travel (CT), and Long Travel (LT) motions to ensure safe operation and compliance with FEM/ISO standards.

Hoist Brake Parameters

  • SWL & Hook Weight: The total static load that the brake must hold against gravity.
  • Drum Diameter & Gear Ratio: These mechanical parameters determine how the load force translates to torque at the high-speed motor shaft where the brake is typically mounted.
  • Rope Reeving (Falls): The number of rope falls (e.g., 4 falls) reduces the force on the drum, which directly reduces the required holding torque.
  • Safety Factor: Standard industrial practice requires a factor of 1.5 to 2.5. A factor of 2.0 means the brake can hold twice the maximum rated load.

Travel Brake Parameters (CT/LT)

  • Total Moving Mass: The combined weight of the crane bridge, trolley, and the maximum lifted load.
  • Deceleration Time: Unlike hoists, travel brakes are designed to absorb kinetic energy. A shorter stopping time requires a much higher braking torque.
  • Rolling Friction & Gradient: The calculator accounts for the natural resistance of the wheels and any slope in the gantry to ensure a controlled stop.