Example for horizontal travel drive
The task
A travel drive is to be accelerated and decelerated twice within a total cycle time of 50 s. Calculate the brake resistor to be used for an AX5112 servo drive.
Default values
- Speed 3000 rpm
- Acceleration and braking time 0.5 s
- Moment of inertia reduced to the motor shaft 0.02 kgm²
- Motor moment of inertia 0.0024 kgm²
Procedure
- Calculation of the angular velocity
- Calculation of the required braking torque
- Calculation of the mean braking power for each braking process
- Calculation of the required continuous power
![Example for horizontal travel drive 1:](Images/png/5500071819__Web.png)
![Example for horizontal travel drive 2:](Images/png/5500074379__Web.png)
![Example for horizontal travel drive 3:](Images/png/5500076939__Web.png)
![Example for horizontal travel drive 4:](Images/png/5500284299__Web.png)
Since the internal brake resistor already offers a continuous power of 90 W, it is sufficient for this application.
If the result is calculated for ten braking operations, it corrects itself as follows:
Required continuous power for ten braking operations
![Example for horizontal travel drive 5:](Images/png/5500286859__Web.png)
For this value it is recommended to use an external brake resistor AX2090-BW50-0300 with 300 W continuous power.