Hi,
I have not used Proteus so far, is the green bar in the left of the motor the RPM sensor?
In my opinion this approach does not emulate a bike ride correct. I would expect e.g. a current sensor which gives feedback about the current sourced by the motor.
For example, two rides with the same RPM:
(i) a slow ride without an altitude change
(ii) an exhausting ascent
Althoug both rides may result in the same RPM, ride (ii) will definitively result in a higher heart rate, and for your case, the motor will source a higher current.
greets