Methods, systems and apparatus for synchronous current regulation of a five-phase machine

A system, comprising:

• a five-phase AC machine having five phases;
• a five-phase inverter module, coupled to the five-phase AC machine, and being designed to generate five-phase stationary reference frame stator currents;
• a five-to-αβ phase transformation module designed to perform a five phase-to-αβ phase transformation, based on particular phases indicated in a fault signal as being faulting phases, wherein the five phase-to-αβ phase transformation transforms particular ones of the five-phase stationary reference frame stator currents that correspond to non-faulting phases to αβ-phase stationary reference frame stator currents, and wherein particular ones of the five-phase stationary reference frame stator currents that correspond to faulting phases that are experiencing fault condition(s) are excluded from the five phase-to-αβ phase transformation;
• a stationary-to-synchronous transformation module designed to receive the αβ-phase stationary reference frame feedback stator currents, and a rotor angular position and to generate synchronous reference frame feedback current signals;
• and
• a synchronous current regulator designed to:
• generate synchronous reference frame voltage command signals, based on the synchronous reference frame feedback current signals, and synchronous reference frame current commands.

A vector controlled motor drive system, comprising:

• a five-phase AC machine having five phases;
• a five-phase inverter module, coupled to the five-phase AC machine, and designed to generate five-phase stationary reference frame stator currents;
• a current measurement module designed to measure the five-phase stationary reference frame stator currents that are feedback from the five-phase AC machine;
• a fault detection module designed to:
• determine whether a phase fault condition exists with respect to one or more of the five phases based on the measured five-phase stationary reference frame stator currents;
• generate a fault signal when a phase fault condition is determined to exist with respect to one or more of the five phases, wherein the fault signal indicates that a fault condition has been detected with respect to one or more phase(s) and includes information that indicates which particular phases are presently experiencing the fault condition;
• and
• a five-to-αβ phase transformation module designed to:
• receive the fault signal and the five-phase stationary reference frame stator currents that are feedback from the five-phase AC machine, select, based on the particular phases that are identified as presently experiencing a fault condition in the fault signal, one of a plurality of five phase-to-αβ phase transformation equations that is to be used to transform particular ones of the five-phase stationary reference frame stator currents that correspond to non-faulting phases, modify the selected five phase-to-αβ phase transformation equation, based on the particular phases indicated in the fault signal that correspond to the non-faulting phases, to generate a modified five phase-to-αβ phase transformation equation;
• and transform, based on the modified five phase-to-αβ phase transformation equation, the particular ones of the five-phase stationary reference frame stator currents that correspond to generate non-faulting phases to αβ-phase stationary reference frame stator currents;
• a stationary-to-synchronous transformation module designed to receive the αβ-phase stationary reference frame feedback stator currents and a rotor angular position, and to generate a synchronous reference frame d-axis current signal and a synchronous reference frame q-axis current signal;
• and
• a synchronous current regulator designed to regulate current in a synchronous reference frame, wherein the synchronous current regulator is designed to:
• generate a synchronous reference frame d-axis voltage command signal and a synchronous reference frame q-axis voltage command signal based on the synchronous reference frame d-axis feedback current signal, the synchronous reference frame q-axis feedback current signal, a d-axis current command and a q-axis current command.