(57) ABSTRACT A motor drive for driving a permanent magnet electrical machine includes
an inverter having switches that are selec tively operated to control current flow and terminal
voltages in the electrical machine and a controller operatively con nected to the inverter to
control switching of the switches to control the current flow and terminal voltages in the elec
trical machine. The controller receives inputs regarding at least one of currents and voltages
provided to the electrical machine on one or more phases, analyzes the voltages and …