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This is probable. Renault guys officially confirmed they will use wound rotor synchronous motors in their cars. So Nissan would.

Is the control side any easier than an ACIM?
Generally - a bit. With separately controlled field, you can operate this motor at PF 1.0 all the time and avoid some calculation steps in control algorithm. But hardware is more complicated (field controller and its power stage) and costs more. This is offset to some extent by greater power density of a synchronous motor when compared to an IM.

Just thinking of reasons Nissan might have chosen it over ACIM.
I don't think that control difficulties have played any role. AC IM control is well established and widespread.
 
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