I need to speed control small ( 0.25 HP ) 3 phase 2800 rpm motor to achieve speed in the range of 6000-7000 rpm. I know basic stuffs. ( have created soft starter etc ... which is good enough for achieving slower speed than rated speed...) but How would I increase speed ? another problem is, I have 1 phase input.
I can work out the micro controller ( mostly AVR and ARM ) stuff but have no idea about power electronics
I have read to use pwm to create sine wave form which in turn can be smooth out by motor coil itself. I can generate the frequency and wave forms in microcontroller.
1) How do I create DC from 1 phase AC that can be good enough for 0.25 HP 3 phase motor. ( for at least 10 hour continuous running. ) 2) What do I need to convert my pwm waveform to actual ac using dc source. I know theory, but I am concerned about chip selection and detail circuitry.