Abstract: The present invention provides a heat source unit capable of being used in either an air conditioner for switchable cooling and heating operation or an air conditioner for simultaneous cooling and heating operation. An air conditioner principally includes one heat source unit, a plurality of utilization units, and a connecting unit provided for each utilization unit. The heat source unit uses water as the heat source, and principally includes a compressing means, a main heat exchanger, a first switching means, a main refrigerant switching means, an auxiliary heat exchanger connected in parallel with the main heat exchanger, a second switching means, an auxiliary refrigerant switching means, and a liquid receiver. The auxiliary heat exchanger is capable of switching between functioning as an evaporator and a condenser, by the second switching means.

Abstract: A print head driving circuit is provided whereby, even if the load changes, the accuracy of the driving voltage waveform supplied to the load can be maintained, and consequently, deterioration in printing quality can be prevented. Transistors Q3, Q4 connected in a push-pull configuration are connected to the upstream of a transistor Q1. If the base potential of the transistor Q1 rises above its normal level, then the emitter potential of the transistors Q3, Q4 will rise and the transistor Q3 will become non-conductive, and the transistor Q1 will also become non-conductive, but since the transistor Q4 is conductive, the current I2 will flow from the base terminal of the transistor Q1, to earth, via the transistor Q4, and hence the base potential of the transistor Q1 will fall to or below the prescribed value. As a result, it is possible to prevent the base potential of the transistor Q1 from rising up in excess of the prescribed value.

Abstract: An electric-machine rotor is composed of a field coil, a pair of pole cores having a plurality of claw poles to enclose the field coil, a plurality of auxiliary permanent magnets disposed between the claw poles, a shaft fixed to the pair of pole cores, and a pair of slip rings connected to the field coil. The rotor is provided with a pattern on a surface of the pole cores for indicating the polarity of the claw poles when the field coil is energized.

Abstract: A head drive circuit is adapted to selectively drive piezoelectric elements for ejecting liquid droplets from a liquid jetting head of a liquid jetting apparatus. A charger is adapted to apply a bias voltage to ground-side electrodes of the piezoelectric elements. An anomalous voltage detector outputs a detection signal when a charging voltage of the charger is a predetermined value or more.

Abstract: A stator winding includes at least two pairs of in-slot portions aligned in a depth direction of each of slots and first and second coil-ends that respectively extend from opposite axial ends of the slots. The first coil-end a includes a plurality of crossover wires, each of which connects one of the in-slot portions disposed in one layer of the one of the slots and another of the in-slot portions disposed in another layer of second one of the slots that is spaced apart from the first one of the slots by a narrower pitch than a pole-pitch between the N and S poles. The second coil-end includes a plurality of crossover wires, each of which connects one of the in-slot portions disposed in one layer of third one of the slots and another of the in-slot portions disposed in another layer of fourth one of the slots that is spaced apart from the third one of the slots by the pole-pitch between the N and S poles.

Abstract: A rotary electric machine having an armature winding that includes three first phase-windings that form a &Dgr;-connection winding having output ends and three second phase-windings that are respectively connected in series to the output ends to form a star-connection three-phase winding having output ends connected to a rectifier unit.

Abstract: A rotary electric machine having an armature winding that includes three first phase-windings that form a &Dgr;-connection winding having output ends and three second phase-windings that are respectively connected in series to the output ends to form a star-connection three-phase winding having output ends connected to a rectifier unit.

Abstract: In an ink jet printer, a print head is provided with a plurality of nozzles. Each of piezoelectric elements is associated with one of the nozzles, and is provided with a drive electrode and a common electrode. A head driver generates a drive signal for driving the piezoelectric elements, and selectively supplies the drive signal to at least one of the piezoelectric elements to eject an ink droplet from at least one associated nozzle. A bias power source applies a bias voltage having a predetermined potential to the common electrode of each piezoelectric element.

Abstract: A sequentially joined segment armature coil is provided which may be employed in an ac machine such as an ac motor or motor generator. The armature coil is equipped with three phase coils each of which is made up of a first and a second phase windings identical in number of turns. This structure permits the number of turns of the armature coil to be changed easily by changing a connection of the first and second phase winding between a series connection and a parallel connection or changing a connection of the phase coils between a star connection and a delta connection. The structure also enables terminal leads of the first and second phase windings of each of the phase coils to be collected and withdrawn outside the ac machine, thus facilitating ease of arrangement of the terminal leads.

Abstract: A rotor of an AC generator includes a field coil, a pole core having a plurality of claw poles disposed in the circumferential direction to enclose the field coil to provide a plurality of magnetic fields when the field coil is energized and a cylindrical permanent magnet disposed inside the plurality of claw poles to supplement the plurality of magnetic fields. The cylindrical permanent magnet is easy to orient magnetic character so that strong magnetic field can be provided at a low cost.

Abstract: A liquid-cooled vehicle generator-motor includes a frame having a liquid passage, a stator core fixedly fitted to the inner periphery of the frame, a multi-phase stator winding accommodated in the plurality of slots of the stator core, and a rotor disposed inside the stator core. The stator winding includes a plurality of insulated U-shaped conductor segments each of which has a pair of legs. Each leg is inserted in a slot from one end of the stator core and paired to another at a portion extending from the other end of the stator.

Abstract: A head driving device of a liquid jetting apparatus includes a driving element, respectively provided corresponding to plural nozzles from which a liquid droplet is jetted, a driving waveform generating circuit, generating a driving waveform to drive the driving element selectively at predetermined jetting timing, a current amplifying circuit, amplifying the driving waveform and a current amplifying element, connected in parallel with an amplifying element of the current amplifying circuit. The current amplifying element is operated when a current value of the current amplifying circuit exceeds a predetermined value.

Abstract: A head drive circuit is adapted to selectively drive piezoelectric elements for ejecting liquid droplets from a liquid jetting head of a liquid jetting apparatus. A charger is adapted to apply a bias voltage to ground-side electrodes of the piezoelectric elements. An anomalous voltage detector outputs a detection signal when a charging voltage of the charger is a predetermined value or more.

Abstract: A stator winding includes at least two pairs of in-slot portions aligned in a depth direction of each of slots and first and second coil-ends that respectively extend from opposite axial ends of the slots. The first coil-end a includes a plurality of crossover wires, each of which connects one of the in-slot portions disposed in one layer of the one of the slots and another of the in-slot portions disposed in another layer of second one of the slots that is spaced apart from the first one of the slots by a narrower pitch than a pole-pitch between the N and S poles. The second coil-end includes a plurality of crossover wires, each of which connects one of the in-slot portions disposed in one layer of third one of the slots and another of the in-slot portions disposed in another layer of fourth one of the slots that is spaced apart from the third one of the slots by the pole-pitch between the N and S poles.

Abstract: An axial length of an iron core of a stator is set larger than an axial length of a cylindrical part on which a field coils are wound. An axial thickness of a yoke part is set larger than a radial thickness of a claw-like magnetic pole part. The cylindrical part is separate from the yoke part and fixed to the yoke part with the cylindrical part in contact with the yoke part. Thus, the contact surface of the cylindrical part and that of the yoke part serve as a thermal resistance, respectively, thereby preventing heat from being transmitted from the yoke part to the cylindrical part.

Abstract: The present invention provides a variable optical dispersion compensating module comprised of (a) an optical dispersion compensating unit having an input optical switch, an optical dispersion compensating fiber, connected to the optical switch, having a predetermined optical dispersion amount, a bypass path for bypassing the optical dispersion compensating fiber, and an output optical switch connected to the optical dispersion compensating fiber and the bypass path, (b) an optical dispersion compensating circuit with at least one of the unit connected in series, and (c) an optical attenuator provided, in the direction of an optical path, after the input optical switch or before the output optical switch of the optical dispersion compensating circuit.

Abstract: A rotary electric machine has two sub-windings shifted by 30 degrees from each other. Each sub-winding is connected to an individual bridge which has MOS transistors on the ground sides. It is possible to supply a charging current even at a low rotational speed by switching the MOS transistors at a high-frequency. The basic components of magnetic force are canceled because of the shifted sub-windings. The switching components of the magnetic forces generated by the switching operation are canceled by switching two groups of the MOS transistors in opposite states. As a result, it is possible to decrease the magnetic noise significantly.

Abstract: In an ink jet printer, a print head is provided with a plurality of nozzles. Each of piezoelectric elements is associated with one of the nozzles, and is provided with a drive electrode and a common electrode. A head driver generates a drive signal for driving the piezoelectric elements, and selectively supplies the drive signal to at least one of the piezoelectric elements to eject an ink droplet from at least one associated nozzle. A bias power source applies a bias voltage having a predetermined potential to the common electrode of each piezoelectric element.

Abstract: An AC generator for a vehicle including a rotor with a fan, a stator disposed around the outer periphery of the rotor, and frame. The stator includes a laminated core having a plurality of slots, a plurality of electric conductors in the slots, and an insulator. There is a gap between the electric conductors and the insulator in a diametrical section of the slots, and an area ratio of the gap with respect to the sectional area of the slots is not more than 25%. A portion of the electric conductor positioned within the slot has a substantially rectangular shape along the shape of the slot.

Abstract: A vehicular alternator has a stator winding, in which a middle point of one phase winding is connected to a winding finish end of another phase winding in a cyclic manner among the three-phase windings. A &Dgr;-connection portion is formed by a portion between the middle points and the winding finish ends of the respective phase windings and a Y-connection portion is formed by a portion other than the &Dgr;-connection portion. The output characteristic of the vehicular alternator is variable depending on a position of the middle point.