motor starter question- any electrical types out there?

that part......
The starter motor is a high torque low speed device to spin the main motor up to sufficient RPM to operate on its own on a single phase circuit.

It needs to be shut off so that the main motor drops below its operational RPM in order to disengage, hence the hold time to disengage and allow the main motor to wind down.

What part are you confused on?
What I'm calling a motor starter is a separate box with solenoids in it which are triggered by low current 110v circuit so you don't have 26 amps going thru your on/off switch. What you are saying is there is something inside the housing of this 5hp motor to spin it up to running speed, like a commercial jetliner using APU gases to spin the turbines? Never heard of that.