induction motor soft starter

manelyh =E5=86=99=E9=81=93=EF=BC=9A

you need diagram of main circuit or control part?

'soft-starter' could mean a few different things.

Some work by applying a reduced voltage by simply 'chopping' the AC with a phase-controlled thyristor network. Others are full-blown variable frequency/ variable-voltage starters (VFVV).

Simulating the internals in matlab would be a project in and of itself. Perhaps all you need is something to behave 'like' a soft-starter so you can use matlab to study the motor/load or something? A simple 'ramp' up of applied voltage at a fixed rate would be easy to simulate. Or one that limits motor current to some maximum and controls applied voltage accordingly?

daestrom

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No, no such thing as a variable frequency variable voltage "starter", that is a DRIVE. Some people like to part with their hard earned money too easilly and BUY VFDs when they could have used a soft starter, but that doesn't mean that VFds should be considered the same thing for this purpose.