A system comprising: a motor system comprising a plurality of motor stacks (304 1 to 304 4) connected in series, wherein each motor stack comprises a first motor (M 1A to M 4A) and a second motor (M 1b to M 4B), wherein the motor system is configured to (i) exhibit a plurality of stack voltages (V1 to V4), wherein each stack voltage corresponds to a respective motor stack in the plurality of motor stacks and (ii) exhibit a plurality of differential powers, characterized in that each differential power corresponds to a respective motor stack in the plurality of motor stacks and wherein each differential power is given by one half of a power difference between the first motor and the second motor in the respective motor stack; and the system further comprises a control system comprising: (i) an averager configured to average the stack voltages to generate an average stack voltage, (ii) a first circuit configured to generate, based at least in part on the average stack voltage, a nominal stack power corresponding to each stack voltage, and (iii) a second circuit configured, for each motor stack, to combine the corresponding differential power and the corresponding nominal stack power to generate both: (a) a first motor power corresponding to the first motor in the motor stack and (b) a second motor power corresponding to the second motor in the motor stack; wherein, for each motor stack, the control system is configured to control the first and the second motors in the motor stack based on the first and second motor powers for the motor stack. a motor system comprising a plurality of motor stacks (304 1 to 304 4) connected in series, wherein each motor stack comprises a first motor (M 1A to M 4A) and a second motor (M 1b to M 4B), wherein the motor system is configured to (i) exhibit a plurality of stack voltages (V1 to V4), wherein each stack voltage corresponds to a respective motor stack in the plurality of motor stacks and (ii) exhibit a plurality of differential powers, characterized in that each differential power corresponds to a respective motor stack in the plurality of motor stacks and wherein each differential power is given by one half of a power difference between the first motor and the second motor in the respective motor stack; and the system further comprises a control system comprising: (i) an averager configured to average the stack voltages to generate an average stack voltage, (ii) a first circuit configured to generate, based at least in part on the average stack voltage, a nominal stack power corresponding to each stack voltage, and (iii) a second circuit configured, for each motor stack, to combine the corresponding differential power and the corresponding nominal stack power to generate both: (a) a first motor power corresponding to the first motor in the motor stack and (b) a second motor power corresponding to the second motor in the motor stack; wherein, for each motor stack, the control system is configured to control the first and the second motors in the motor stack based on the first and second motor powers for the motor stack. (i) an averager configured to average the stack voltages to generate an average stack voltage, (ii) a first circuit configured to generate, based at least in part on the average stack voltage, a nominal stack power corresponding to each stack voltage, and (iii) a second circuit configured, for each motor stack, to combine the corresponding differential power and the corresponding nominal stack power to generate both: (a) a first motor power corresponding to the first motor in the motor stack and (b) a second motor power corresponding to the second motor in the motor stack;