Rotating electrical machine control device

A rotating electrical machine control device that controls, through a first inverter and a second inverter, drive of a rotating electrical machine having open-end windings of a plurality of phases, the open-end windings being independent of each other,

• wherein
• the first inverter is connected to a one-end side of the open-end windings of a plurality of phases to convert electric power between direct current and alternating currents of a plurality of phases,
• the second inverter is connected to an other-end side of the open-end windings of a plurality of phases to convert electric power between direct current and alternating currents of a plurality of phases,
• in the first inverter and the second inverter, each arm for one alternating current phase includes a series circuit of an upper-stage-side switching element and a lower-stage-side switching element,
• control schemes for the first inverter and the second inverter include at least pulse width modulation control in which a plurality of pulses with different patterns are outputted in one cycle of electrical angle;
• and active short-circuit control in which the upper-stage-side switching elements in the arms for all of a plurality of phases are brought into on state or the lower-stage-side switching elements in the arms for all of a plurality of phases are brought into on state, and the pulse width modulation control includes, as the control schemes, continuous pulse width modulation control in which pulse width modulation is continuously performed for all of the arms for a plurality of phases;
• and discontinuous pulse width modulation control in which pulse width modulation is performed including a period during which switching elements in one of the arms for one of a plurality of phases are fixed to on state or off state,
• the first inverter and the second inverter can be controlled using the control schemes that are independent of each other,
• as control regions of the rotating electrical machine, a first speed region, a second speed region in which rotational speed of the rotating electrical machine is higher than in the first speed region for same torque, and a third speed region in which rotational speed of the rotating electrical machine is higher than in the second speed region for same torque are set, and
• target control is performed in which
• in the first speed region, one of inverters, the first inverter or the second inverter, is controlled by the active short-circuit control, and an other one of the inverters is controlled by the continuous pulse width modulation control,
• in the second speed region, one of the inverters, the first inverter or the second inverter, is controlled by the active short-circuit control, and an other one of the inverters is controlled by the discontinuous pulse width modulation control, and
• in the third speed region, both of the inverters, the first inverter and the second inverter, are controlled by the discontinuous pulse width modulation control.