OMG we are going automotive...Rb, see prandevou's reply . Its really just an experiment to see if it can be done. Eventually it would be put into an electric vehicle.
no, he's helping me with my go cartOMG we are going automotive...
You mean 2 for each leg?only need 2 IGBTs instead of 6,
oh yeah. DOH! I was imagining 2 low side switches, one for each winding, like 2 DC motors. Somehow it escaped me that is this is AC.You mean 2 for each leg?
If we have two separated coils we will need 4 IGBTs for each coil in case of a fullbridge.( that's 8 in total). If it was a halfbridge it will be 2 IGBTs for each coil (don't know how well or if a halfbridge would work). If we somehow are able to join the coils on one end it will still be 6 IGBTs.
That means unipolar PWM?Rb, I have IGBT switching modules for that. http://www.datasheetarchive.com/2mb1200*-datasheet.html I'm rewinding the motor for 100V, so the DC bus will be ~140V.
It is the way that I think all of the EVs will eventually be made. The Remy motors in the GM Volt and from what I can find out the Tesla are using 2phase now. Ac motors will eventually be what will win in Ev's.shortbus, I am curious; why have you chosen 2 phase? is it just to be different, or have you realized some advantage to it over 3 phase? The only advantage I can think of is less parts in the VFD. only need 2 IGBTs instead of 6, but does that make up the difference of the increased price of the oddball motor? I'm thinking from a production standpoint, if you were going to market this. If it's just for your own little one time project and you do the rewinding yourself, I can see how you would save.
Another thing I was wondering about is the actual rewinding of the 3 phase motor. are the stator slots going to line up properly for the different amount of phases and poles? what will you need to do to the rotor?
EDIT: just thought of the fact that not only do you only need 2 IGBTs, but they can both be low side switches, which makes things much simpler. I guess you're on to something here.
If the stator slots divide evenly by 4 (like if there are 24 stator slots) then it should be possible to rewind as 2 phase....
Another thing I was wondering about is the actual rewinding of the 3 phase motor. are the stator slots going to line up properly for the different amount of phases and poles? what will you need to do to the rotor?
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As long as you rewind the motor as the same number of poles the phase number makes no difference. A four pole motor is still a four pole motor.If the stator slots divide evenly by 4 (like if there are 24 stator slots) then it should be possible to rewind as 2 phase.
But the rotor is bugging me too! What type of rotor does it have and how many poles does the rotor have? Depending on rotor type it may be totally unsuitable for 2 phase operation...
I've been down that road of questioning and all I found was availability and cost (to an extent)What's the advantage of having an AC motor instead of a BLDC motor in an EV?
Cost? Robustness? Efficiency?
Are you sure it will work like that? How will you go from 3 phase stator to 2 phase stator and keep the number of poles (the stator pole angle) the same?As long as you rewind the motor as the same number of poles the phase number makes no difference. A four pole motor is still a four pole motor.
by Aaron Carman
by Duane Benson
by Duane Benson
by Aaron Carman