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Ralph Mowery

In article ,
says...

Well, actually it does.
It has the inertia of both grinding wheel to get up to speed.

The motor could certainly get it up to speed fast with a high torque,
but the user of a grinder can wait a few seconds before applying his
workpiece... so "low startup torque" :== "low startup load" is acceptable in this application.

I doubt the grinder really has that much inertia to prevent starting.
It may tke some time to get up to full speed. Most hard starting is
like air compompressors and refrigeration compressors unless they have
some sort of unloader.