A Lookup Table Based Loss Minimizing Control for FCEV Permanent Magnet Synchronous Motors

A loss minimizing control law is developed for a fuel cell electric vehicle (FCEV) permanent magnet synchronous motor (PMSM) which reflects the effects of field saturation and cross coupling. Inductances are modelled as functions of q-axis current based on the flux data obtained experimentally. For a given torque and a given speed, the loss minimizing current sets are searched from the experimental power loss data which are obtained for various d-axis current. The loss minimizing current sets are made into a lookup table, and it is utilized in the torque control loop. This controller guarantees high efficiency in every possible torque-speed operating point.