Braking torque definition
The braking torques of the BE.. brakes are defined on the basis of DIN VDE 0580. A distinction is made between the following braking torques here:
Abbreviation according to DIN VDE 0580 | Designation | Description |
|---|---|---|
M1 | Dynamic braking torque | Torque acting upon the motor shaft with a slipping brake (brake safely disconnected). The torque depends on the current operating temperature and the current friction speed/motor speed. |
M2 | Virtually static braking torque (= nominal braking torque MB) | Braking torque with slowly slipping brake (relative speed between the friction components: 1 m/s) at 20 °C |
M4 | Static braking torque | Breakaway torque that is necessary to rotate the motor shaft from an idle state with the brake closed. |
The nominal braking torque MB of the brakes is subjected to final testing in the factory at SEW‑EURODRIVE within the scope of quality inspection and is within a tolerance range of -10% and +50% in the delivery state.
MB is used both during brake selection and project planning for the brake. The differences between M1 (dynamic braking torque) and M4 (static braking torque) and the nominal braking torque are taken into consideration by SEW‑EURODRIVE with the formulas and the calculation coefficients that are used when doing this.
That is why the characteristic values M1 and M4 are not relevant during project planning and the selection process of the brake.
Note: The characteristic values M1 and M4 can differ significantly from the nominal braking torque MB depending on the wear and operating state of the brake in some cases, and can particularly be outside the above-mentioned tolerance range of MB.
Should specific requirements of the application require more precise knowledge, please contact SEW-EURODRIVE.
