Micro-Cap Tutorial: MOSFET Inverter Three Phase (Motor Control)

Описание

Basics for understanding three phase MOSFET inverter topology. Here we discuss how current moves based on gate signals for the six MOSFETs in highside/lowside load switch.

I recommend using test resistor loads in "wye" formation when experimenting in the lab. This helps avoid common destructive problems with motor windings.

The spreadsheet feature of micro-cap is nice for developing a commutation table. Writing out each step of the way helps to develop a better understanding of how motor commutation control works.

Note: Avoid shoot through conditions by making certain highside and lowside MOSFETs are never ON at the same time.