Rotating machine control device

A rotating machine control device configured to drive one or more multiphase rotating machines including one or more multiphase winding sets and one or more DC rotating machines in which a first terminal that is one end is connected to a phase current path of one or more phases of at least one of the multiphase winding sets, the device comprising:

• one or more multiphase power converters that are connected to a positive electrode and a negative electrode of a power supply via a high potential line and a low potential line, respectively, convert DC power of the power supply into multiphase alternate current power by operations of a plurality of inverter switching elements connected in a bridge configuration, and apply a voltage to each of phase windings of the multiphase winding set;
• a DC rotating machine switch made up of switches on a high potential side and a low potential side connected in series via a DC motor terminal connected to a second terminal that is an end of the DC rotating machine on an opposite side to the first terminal, the DC rotating machine switch making a voltage of the DC motor terminal variable by switching;
• a control unit that controls operations of the inverter switching elements and the DC rotating machine switch;
• and
• a plurality of current sensors that detect currents flowing through the respective phases of the multiphase power converter, wherein
• when one of the one or more DC rotating machines selected as an energization target is defined as a specific DC rotating machine, and when a phase to which the specific DC rotating machine is connected is defined as a specific phase, and a phase except for the specific phase is defined as a non-specific phase, at a time of energization of the specific DC rotating machine, the control unit computes, as an estimated current value, a value of a current flowing through the specific phase from a value of a current detected by the current sensor of the non-specific phase according to Kirchhoff's law, and computes a current flowing through the specific DC rotating machine from the estimated current value and a value of a current detected by the current sensor of the specific phase.

A rotating machine control device configured to drive one or more multiphase rotating machines including one or more multiphase winding sets and one or more DC rotating machines in which a first terminal that is one end is connected to a phase current path of one or more phases of at least one of the multiphase winding sets, the device comprising:

• one or more multiphase power converters that are connected to a positive electrode and a negative electrode of a power supply via a high potential line and a low potential line, respectively, convert DC power of the power supply into multiphase alternate current power by operations of a plurality of inverter switching elements connected in a bridge configuration, and apply a voltage to each of phase windings of the multiphase winding set;
• a DC rotating machine switch made up of switches on a high potential side and a low potential side connected in series via a DC motor terminal connected to a second terminal that is an end of the DC rotating machine on an opposite side to the first terminal, the DC rotating machine switch making a voltage of the DC motor terminal variable by switching;
• and
• a control unit that controls operations of the inverter switching elements and the DC rotating machine switch, wherein
• the control unit performs abnormality detection of the multiphase power converter or the multiphase rotating machine and switches a fail-safe threshold in the abnormality detection between a drive time and a non-drive time of the DC rotating machine.