Abstract: A rotary electric machine includes a rotor and a stator. A stator core has n in-phase slots provided in the circumferential direction and correspond to magnetic poles, and into each of which phase windings of the same phase are installed. Each of the phase windings is divided into 2n portions in an extending direction so that each of the phase windings is configured by a first partial winding, a second partial winding, . . . , and a 2n-th partial winding arranged from one end positioned in the extending direction in sequence. The first partial winding and the 2n-th partial winding are inserted into different in-phase slots of the stator core. Counted from one end positioned in the extending direction, the 2m-th (1?m?n) partial winding at an even-numbered position and the (2m?1)-th partial winding are inserted into different in-phase slots of the stator core.

Abstract: A DC voltage source, a switch, and an inductor are connected together in series. The inductor is also connected together with a switch, a piezoelectric element in series. Moreover, the switches are connected in parallel with capacitors. By the control circuit, a state in which either of the switches is turned on is repeated through a state in which both of the switches are turned off. Furthermore, in a state in which both switches are turned off, after turning the switch off to enter the state concerned, when the voltage across both terminals of the switch that will be turned on is reduced by the resonance of a resonance circuit composed of the capacitors and the inductor, the switch concerned is turned on.

Abstract: In a reversible buck-boost chopper circuit, a first half-bridge circuit has a first switching element with a high-side main electrode connected to a positive electrode of a DC power source, and a second switching element is connected to the first switching element at a first output terminal. A low-side main electrode of the second switching element is connected to a negative electrode of the DC power source. A second half-bridge circuit has a third switching element with a high-side main electrode connected to a high-side terminal of the load. A fourth switching element of the second half-bridge circuit is connected to the third switching element at a second output terminal. A low-side main electrode of the fourth switching element is connected to a low-side terminal of the load and the negative electrode. A reactor is connected between the first and second output terminals.

Abstract: A DC voltage source, a switch, and an inductor are connected together in series. The inductor is also connected together with a switch, a piezoelectric element in series. Moreover, the switches are connected in parallel with capacitors. By the control circuit, a state in which either of the switches is turned on is repeated through a state in which both of the switches 3, 4 are turned off. Furthermore, in a state in which both switches are turned off, after turning the switch off to enter the state concerned, when the voltage across both terminals of the switch that will be turned on is reduced by the resonance of a resonance circuit composed of the capacitors and the inductor, the switch concerned is turned on.

Abstract: In a reversible buck-boost chopper circuit, a first half-bridge circuit has a first switching element with a high-side main electrode connected to a positive electrode of a DC power source, and a second switching element is connected to the first switching element at a first output terminal. A low-side main electrode of the second switching element is connected to a negative electrode of the DC power source. A second half-bridge circuit has a third switching element with a high-side main electrode connected to a high-side terminal of the load. A fourth switching element of the second half-bridge circuit is connected to the third switching element at a second output terminal. A low-side main electrode of the fourth switching element is connected to a low-side terminal of the load and the negative electrode. A reactor is connected between the first and second output terminals.