Battery charging algorithm using the PMSM Windings
Electrical vehicles have a dedicated converter for the charging of the battery which increases the cost and weight of the machine. Charging could be done using the motor windings as grid side inductors and controlling the inverter to operate as an active boost rectifier. The challenge in this approach is the unequal phase inductances which depend on the rotor position and another problem appears when the battery gets discharged below the peak of the grid voltage, typically if the vehicle has not been used for a longer period of time. An algorithm to compensate the unequal inductances and temporary charge almost depleated batteries was developed and tested in the laboratory. A paper was also published for the Vehicle Power and Propulsion Conference (VPPC), 2014 IEEE.