> Starting from a stop causes a lot of stress on electric motors and commercial electric motors operating hours are usually guaranteed when the number of starts

> Starting from a stop causes a lot of stress on electric motors and commercial electric motors operating hours are usually guaranteed when the number of starts per hour are below some threshold. Do you have a source for this that would apply to AC or PMDC motors with variable frequency drives as are applied to vehicles? I think your claim might only apply to old-school designs with starting/running capacitors.