I think Torque Actuator block is a part of First Generation SimDriveline Models, support for them ended in R2017a, you can find this in the release notes.
To convert an existing model or custom library that contains Simscape Driveline First-Generation blocks, open your model or library in either:
- Simscape Driveline — R2016a or R2016b
- SimDriveline — R2011a–R2015b
Convert your model or library automatically using the sdl_update function, or manually through block replacement. For more, information, see Migrate to Second Generation.
Hope this helps!
