| CPC H02P 27/085 (2013.01) [H02P 29/028 (2013.01)] | 8 Claims |
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1. 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 that are 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 another-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,
the first inverter and the second inverter can be controlled independently of each other,
when an open-circuit failure in which one switching element is always in an open-circuit state has occurred in either one of inverters, the first inverter or the second inverter, each of alternating currents of a plurality of phases is added up to compute current integrated values for the respective phases, and occurrence of the open-circuit failure is detected based on positive and negative polarities of each of the current integrated values, and a location where the open-circuit failure has occurred is determined, and
when occurrence of the open-circuit failure has been detected upon controlling both of the inverters, the first inverter and the second inverter, by mixed pulse width modulation control in which control is performed such that a plurality of pulses with different patterns are outputted during a first period and an inactive state continues during a second period, the first period being a ½ cycle of electrical angle and the second period being another ½ cycle,
it is determined which one of a first failure pattern and a second failure pattern is a failure pattern, based on positive and negative polarities of each of the current integrated values in a first control state, the first failure pattern being a pattern in which one of a set of upper-stage-side arms of the first inverter and a set of lower-stage-side arms of the second inverter is failure-side arms in which the open-circuit failure has occurred, and the second failure pattern being a pattern in which one of a set of lower-stage-side arms of the first inverter and a set of upper-stage-side arms of the second inverter is the failure-side arms,
it is determined which one of a first lower-stage-side failure pattern and a second lower-stage-side failure pattern is a lower-stage-side failure pattern, based on each of the current integrated values in a second control state different from the first control state, the first lower-stage-side failure pattern being a pattern in which the lower-stage-side arms of the second inverter are the failure-side arms, and the second lower-stage-side failure pattern being a pattern in which the lower-stage-side arms of the first inverter are the failure-side arms, and
it is determined which one of a set of the upper-stage-side arms of the first inverter, a set of the lower-stage-side arms of the first inverter, a set of the upper-stage-side arms of the second inverter, and a set of the lower-stage-side arms of the second inverter is the failure-side arms, based on a result of the determination in the first control state and a result of the determination in the second control state.
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