Patent ID: 7592766

Claim:
A method of operating a permanent magnet axial flux motor, comprising: obtaining from an optimized current command table, commanded d-and q-axis currents nominally sufficient to provide the requested torque and motor speed consistent with the available DC voltage; combining at least one of the commanded d- and q-axis currents with a field weakening correction term to provide a corrected output to a current controller, wherein the combining step comprises for M*index<Mlow, omitting the field weakening correction, and for Mlow<M*index<Mhigh, setting Mref=M*index, and for M*index>Mhigh, setting Mref=Mhigh; converting the corrected output from synchronous to stationary current frame of reference; and operating an inverter based on the stationary frame output to provide current to coils of the motor, thereby causing the motor to operate substantially at the requested torque and motor speed.