What is a purpose of a variable speed drive?

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Briefly, a VFD has the following important features: Over-current protection, especially useful while controlling motors with high inertia.Constant torque ensures wider range of speed control, enabling an energy efficient control throughout the range. The VFD acts as a barrier in between all input voltage disturbances like harmonics, ripples, sags, surges, etc., and obstructs them from entering the motor.

Author: https://www.brighthubengineering.com/power-generation-distribution/76956-controlling-ac-motor-speed-using-vfds-through-constant-vf-ratio/