field weakening in sepex ac motor

[D@F]

hi all,
i do some search on internet, but i don't realy find somthing interresting.
i'm working on an old renault kangoo that have a sepex ac motor ( some zoe have same type)
if i manage field weakening by lowering the power on the rotor, it will be more simple than with the 3 phases ?
is there some math that could help me to start some experimentation anywhere ?

[johu]

Yes it's certainly more effective to reduce rotor current. I wonder if it can be achieved with the inverters aux PWM output. It can be proportional to speed with programmable offset and gain (negative also possible). It runs at fixed 17.6kHz.

[Jack Bauer]

Could be a good use for a prius inverter. I also have a Fluence motor that will need a similar setup.

[D@F]

Yes it's certainly more effective to reduce rotor current. I wonder if it can be achieved with the inverters aux PWM output. It can be proportional to speed with programmable offset and gain (negative also possible). It runs at fixed 17.6kHz.

that's i was thinking about, but i'm not an expert in programming processor.
i do some search in the source if i can find where the pwm outpout line are , but i don't find anything.
may be if you show me i can try something with a friend.

[D@F]

Could be a good use for a prius inverter. I also have a Fluence motor that will need a similar setup.

yes fluence and kangoo next generation.
for the zoé there is some continental but i don't know if they work like the renault one.

[D@F]

I use à DC motor controller to drive the power in the rotor.
It need a pwm but, as i understand i need to lower the power at high rpm.
I don’t have a reverse command on it.
Power is propotional to the pwm %.
Is it possible to have a reverse pmw output ?