One or more multiphase power converters are connected to a power supply via a high potential line and a low potential line, convert DC power of the power supply into multiphase alternate current power by operations of inverter switching elements, and apply a voltage to each of phase windings of the multiphase winding set. A DC rotating machine switch are made up of two or more legs, each of which is 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. The DC rotating machine switch makes a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

One or more multiphase power converters 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, and apply a voltage to each of phase windings of a multiphase winding set. A DC rotating machine switch including 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 a first terminal. The DC rotating machine switch generates a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

One or more multiphase power converters 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, and apply a voltage to each of phase windings of a multiphase winding set. A DC rotating machine switch including 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 a first terminal. The DC rotating machine switch generates a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

One or more multiphase power converters 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, and apply a voltage to each of phase windings of a multiphase winding set. A DC rotating machine switch including 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 a first terminal. The DC rotating machine switch generates a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

One or more multiphase power converters 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, and apply a voltage to each of phase windings of a multiphase winding set. A DC rotating machine switch including 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 a first terminal. The DC rotating machine switch generates a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

One or more multiphase power converters are connected to a power supply via a high potential line and a low potential line, convert DC power of the power supply into multiphase alternate current power by operations of inverter switching elements, and apply a voltage to each of phase windings of the multiphase winding set. A DC rotating machine switch are made up of two or more legs, each of which is 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. The DC rotating machine switch makes a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

One or more multiphase power converters are connected to a power supply via a high potential line and a low potential line, convert DC power of the power supply into multiphase alternate current power by operations of inverter switching elements, and apply a voltage to each of phase windings of the multiphase winding set. A DC rotating machine switch are made up of two or more legs, each of which is 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. The DC rotating machine switch makes a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.

A line interface filter apparatus to couple a drive or group of drives to a shared multiphase AC bus, including individual phase circuits having an inductor coupled between a respective bus and drive phase lines, a tapped resistor coupled to the respective drive phase line, and a capacitor coupled between the resistor and a common connection of the capacitors of the individual phase circuits, where the capacitance of the capacitors is 5 to 15 times a per-phase equivalent capacitance of the drive or group of drives, and the resistance of the resistors is two times a damping ratio times a square root of a ratio of the filter inductance to the filter capacitance, where the damping ratio ζ is greater than or equal to 1.0 and less than or equal to 2.0.

A motor driving circuit includes a first motor driving circuit that controls driving of a first motor is disposed, a second motor driving circuit that controls driving of a second motor is disposed, and a constant current generation circuit that generates a constant current is disposed, and the constant current generation circuit is disposed at a position deviating from between the first motor driving circuit and the second motor driving circuit.

A method and line interface filter apparatus to couple a drive or group of drives to a shared multiphase AC bus, including individual phase circuits having an inductor coupled between a respective bus and drive phase lines, a resistor coupled to the respective drive phase line, and a capacitor coupled between the resistor and a common connection of the capacitors of the individual phase circuits, where the capacitance of the capacitors is 5 to 15 times a per-phase equivalent capacitance of the drive or group of drives, and the resistance of the resistors is two times a damping ratio times a square root of a ratio of the filter inductance to the filter capacitance, where the damping ratio is greater than or equal to 1.0 and less than or equal to 2.0.