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With field oriented control, you have i_field and i_torque. For an ACIM, you can just have i_field = i_torque. You have i_torque proportional to throttle. Then if you want regen, just have throttle be negative. Then you are basically regenning at whatever negative torque you want, as long as it's available. I don't know how to have that type of control without FOC though.
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