Braking torque definition
The braking torques of the brakes for servomotors from SEW‑EURODRIVE are defined on the basis of DIN VDE 0580. The following braking torques are distinguished:
Abbreviation according to DIN VDE 0580 | Designation | Description | Characteristic value definition |
|---|---|---|---|
M1 | Dynamic Braking torque | Torque acting upon the motor shaft with a slipping brake (brake closed) | Statistically lowest occurring value of the dynamic braking torque during emergency-stop braking |
M2 | Quasi-static Braking torque | Braking torque with a slowly slipping brake | Temporal average value of the braking torque at a frictional speed of 1 m × s-1 |
M4,100°C | Static Braking torque | The torque that has to be overcome in order to rotate the motor shaft from an idle state with the brake closed | Statistically lowest occurring value of the static braking torque during holding brake operation, based on a friction surface temperature of +100 °C |
The use of the specified characteristic values as nominal values and as nameplate data is defined as follows for the various brake series:
Brake | Nominal braking torque Mbr (information on nameplate) | Additionally defined characteristic values |
|---|---|---|
BP.. | M2 | M1 and M4,100 °C |
BR.. | M2 | M1 and M4,100 °C |
BY.. | M2 | M1 and M4,100 °C |
BK.. | M4,100°C | M1 |
BKB.. | M4,100°C | M1 |
BZ.. | M4,100°C | M1 |
The selection tables contain all of the defined characteristic values.
As part of quality control, SEW‑EURODRIVE verifies the braking torque of all BR.., BY.., and BZ.. spring‑loaded brakes delivered by means of a full final inspection at the factory.
The behavior of the friction systems is subject to physical fluctuations and changes continuously. The value recorded during final inspection is a snapshot that SEW‑EURODRIVE uses to ensure correct and error-free production.
For mechanical dimensioning, the characteristic values M1 and M4,100 °C are used. For more details, refer to Braking torques.
