Information on the limit value assessment of braking distances
During dimensioning for motors with a brake, limit analyses of the stopping distance or the braking deceleration occurring are frequently required. This is driven, for example, by the desire to determine the maximum stopping distance so that it can be used in the context of safety analyses.
In practice, such an assessment involves a high level of effort due to the large number of influencing factors that must be taken into account, or it is often not satisfactorily feasible due to missing/uncertain boundary conditions.
The following shows some example of such influencing factors to be taken into account:
- Time profile of the braking torque
- Actual inertia present in the system
- Friction losses currently occurring in the drive train and the application
- Actual loading condition of the application at the time of braking
- Maintenance condition of the brake or conditioning of the friction system
- Vibration susceptibility of the system
To determine the required brake size, dimensioning usually does not take all operating states and configurations of the application into account; instead, only selected idealized states are considered that appear suitable to represent the most unfavorable load combination.
The calculations presented in the formulas therefore lead to "typical" minimum and maximum values for a discrete model state, which result from statistical assumptions regarding the scattering of the dynamic braking torque. However, the calculated values do not represent absolute maximum and minimum values. These values can be exceeded or undershot.
