Braking torque definition

Project planning of brakes and safety brakes is to be carried out based on the braking torque defined by SEW‑EURODRIVE.

The nominal braking torque M_B is used. By definition, the brake moment is the quasi-static braking torque M₂ according to DIN VDE0580, i.e. the braking torque with a slowly slipping brake (brake closed, relative velocity between the friction components: 1 m/s) at 20 °C.

The nominal value M_B is used both during brake selection and also during planning. The differences between M₁ (dynamic braking torque) and M₄ (static braking torque) and the nominal braking torque are taken into account by SEW‑EURODRIVE with the formulas and the calculation coefficients that are used when doing this.

The characteristic values M₁ and M₄ are therefore not relevant within the scope of the project planning and selection of the brake. For more extensive applicative requirements of the brake, such as carrying out a brake test, the characteristic values M₁ and M₄ may need to be examined and evaluated separately.

In the application, the nominal value MB is combined to enable various test and calculation steps:

• Application factor f_A for combined test of the holding and braking function
• Output factor f_brake,output for checking the output load during emergency stop
• Reduction factor f_Mmin and transmission element factor f_Mmax for determining the braking time, stopping distance, and braking deceleration