Depending on the technical-economic study done by the companies, we can make it clear that the best solution would be another type of electric motor, such as a https://www.mrosupply.com/v-belts/cogged-v-belts/ax-section/181031_ax44_gates-rubber/ ring motor or frequency inverter-driven cage motor. The acceleration time must always be less than or equal to the locked rotor time of the electric motor. Dynamic power is the power required to accelerate the load to nominal speed in a time interval less than or equal to the locked rotor time.
As far as possible, this power must be equal to the rated motor power (not oversized), but depending on the load characteristics (inertia and torque), the dynamic power may adopt values greater than the nominal power or there will be a need to oversize the engine, the dynamic power to accelerate the engine is higher than the power required in the scheme, otherwise the electric motor and the drive may not be able to accelerate the load. In such cases a technical and economic study should be carried out to see if it is possible to use a hydraulic coupling, electromagnetic or clutch.