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Bk mine is a Q also,am having the same problem let the engineers or cosumers help

but how is that economical? (maybe only the capital of instaling the drive?)

been finding out in some books and all i can come up with is either soft starters be used where we neen to start a motor(big)and after that no did to var the speed cos they work with a const load for a long period of time,

why should i use a softstarter in motors if using a frequency converter can have the same results (how economical and why) one more new engineer or pretend to be one.