My primary choice is also <100, not only due to the mosfet, but also for the availability of other controller parts, like small size DC/DC converters from around 100V to low voltage and 100V ceramic capacitors. BMS is also smaller with lower number of cells in series. On the other hand, with the higher phase current of faster winding motors the power supply capacitors become a problem of choice, they should be larger and lower resistance or the signal integrity is challenged. So today if I wanted a >10kW durable system, I would choose 150V or more.
Faster motor winding or slower the eternal discussion!
- Thread starter Doctorbass
- Start date
crossbreak
1 MW
same here. 100V MosFETs have the least loss per conducted Watt.
75V -> IRFP4368 -> 1.46mOhm -> TO247 -> I_max = sqrt( Heat_max / Rds_on ) = sqrt (20 W/0.00146 Ohm) = 117A@75V = 8.8 kW
100V ->IRFP4468 -> 2.0 mOhm -> TO247 -> I_max = sqrt( Heat_max / Rds_on ) = sqrt (20 W/0.002 Ohm) = 100A@100V = 10 kW
150V ->IRFP4568 -> 4.8 mOhm -> TO247 -> I_max = sqrt( Heat_max / Rds_on ) = sqrt (20 W/0.0048 Ohm) = 65A@150V = 9.7 kW
20s feel bad if touching both poles, but it's not lethal. 24s feels much worse IMO
75V -> IRFP4368 -> 1.46mOhm -> TO247 -> I_max = sqrt( Heat_max / Rds_on ) = sqrt (20 W/0.00146 Ohm) = 117A@75V = 8.8 kW
100V ->IRFP4468 -> 2.0 mOhm -> TO247 -> I_max = sqrt( Heat_max / Rds_on ) = sqrt (20 W/0.002 Ohm) = 100A@100V = 10 kW
150V ->IRFP4568 -> 4.8 mOhm -> TO247 -> I_max = sqrt( Heat_max / Rds_on ) = sqrt (20 W/0.0048 Ohm) = 65A@150V = 9.7 kW
20s feel bad if touching both poles, but it's not lethal. 24s feels much worse IMO
