The time from the initial application of voltage , to full motor speed is known as ramp up . The 3 phase soft starts & VFD's I have been involved with , ramp up was adjustable / user set-able . Do not know about the small single phase units ?
I do not know but just a tiny bit about single phase submersible pumps . I know they have a " box " with a start capacitor and maybe a run capacitor ? And a relay that I think switches the start windings out of the circuit when the the motor reaches full speed .
Are the bearings or seals on submersible pumps " cooled " or " lubricated " by the water . When I worked maintenance , we had hot water pumps and chill water pumps in which the seals were water lubricated & maybe cooled ?
Where I am going with this line of question , is , would ramping up have a negative effect on the pump ? I doubt it would harm the electric motor .
Should you seriously consider this , I recommend you ask the vendor for recommendations as to your application .
God bless
Wyr
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