Q: Which microcontroller is used in this project?
A: A 40 pin microcontroller from 8051 family is used in this project.
Q: What is SVPWM?
A: SPWM or sine pulse width modulation is a type of pulse modulation wherein the triangular carrier signal is compared with the sinusoidal reference signal to generate the pulse modulated signals.
Q: What is the rating of motor to be used in this project?
A: 3 phase, ¼HP motor is used in this project.
Q: What is the switching frequency?
A: 3.5KHz is the switching frequency.
Q: What is the function of MOSFET in this project? Can we use BJT instead of MOSFET?
A: Here, MOSFET is used as a switch. BJT can be used, but that needs drive current and not voltage as required for MOSFET.
Q: What is the formula for calculating smoothing capacitor value?
A: There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
Q: How frequency and phase shift is maintained in the program?
A: Switching at 3.5 KHz as frequency has been taken with 120 degree phase shift, all in the program for 6 stage switching as per SVPWM norms.