Good remarks and ofcourse we have taken this in consideration. The simulator is protected by the invertors in two ways:
1. Should the motors overheat a thermal safety will open in the motor which will interrupt a signal to the invertors. The invertors are programmed to stop the motors once this signal has been interrupted.
2. Should the motorarms move beyond the extreme points the motorarms will hit a positionswitch (these are not installed yet). This positionswitch will interrupt another signal to the invertor. And again the invertor will stop the motor once the signal is interrupted.
The safeties above will also work when there aoccurs a cable-break.
The design looks a like the Thruxim but our motors are bigger because we want to have a pitch- and rollangle of 18°. But I don't think they use wormgearmotors for the Thruxim. I think they use a motor with an axial reduction which is better for the lifetime of the motor and the energy efficiency. But these type of motors are far more expensive. And SEW assured us the motors will last a lifetime since it is a simulator for private use. And energy efficiency is not really a big deal for a device that will be used maybe half an our each day.
At this moment anothers student has started working on adding a yaw-axis by placing the whole simulator on rotating point directly driven by a motor. But since it is a schoolproject it will take about a year to finish