Abstract: A reactor core includes an inner core region that extends in a vertical direction, and has a plurality of first fuel pins accommodating an inner core fuel; an outer core region that extends in the vertical direction, is arranged to surround the inner core region from an outer peripheral side, and has a plurality of second fuel pins accommodating an outer core fuel; and a sodium plenum provided above the inner core region and the outer core region, in which a dimension of the outer core fuel in the vertical direction is larger than a dimension of the inner core fuel in the vertical direction, and the position of a center of the outer core fuel in the vertical direction is higher than the position of a center of the inner core fuel in the vertical direction.

Abstract: In an outer rotor type spindle motor in which a shaft 2 and a stator 3 are supported by and fixed to a flange 1, damping members 4 and 5 are interposed between the flange 1 and the stator 3 and between the flange 1 and the shaft 2, or the flange 1 itself is formed of a damping material. Thus, electromagnetic vibration from the stator 3 or rotating vibration from the shaft 2 are damped and absorbed by the damping members 4 and 5. Accordingly, the generation of vibration or noise in the flange can be prevented which is caused by the transmission of the electromagnetic vibration generated on the stator due to an alternating current supplied to a stator coil or by the transmission of the rotating vibration of a rotor received by the shaft to the flange.

Abstract: An electric power conversion apparatus is provided which can protect the electric power conversion circuit against an overcurrent even when the interrupting circuit for preventing an inflow of an overcurrent into the input side caused by phase deviations between an input voltage and an output voltage uses switching means with a slow responsiveness. The switching means used in the interrupting circuit 2 have a slower response speed than those of semiconductor switching elements. The overcurrent detection circuit 3 checks whether the input current is an overcurrent. For as long as an overcurrent is detected by the overcurrent detection circuit 3, the command input blocking circuit 4 blocks the instantaneous current control signal and the instantaneous voltage control signals from being fed into the drive signal generation circuit 5. As the duration of overcurrent increases, the interrupting circuit 2 is activated to interrupt the current inflow.

Abstract: A controlled rectifier equipment with sinusoidal waveform supply current is provided, in which equipment an inexpensive AC current transformer can be used as an AC current detector. The AC current transformer is used as an AC current detector. A DC component eliminating circuit including a low pass filter which cuts off the frequency component of commercial AC power supply is arranged on the line between an current controller in a current control system and a modulation circuit in the conduction control signal generating circuit. The circuit is formed so that a DC offset component which is generated in a controlled rectifier equipment may be eliminated.

Abstract: A controlled rectifier equipment with sinusoidal waveform supply current is provided, in which equipment an inexpensive AC current transformer can be used as an AC current detector. The AC current transformer is used as an AC current detector. A DC component eliminating circuit including a low pass filter which cuts off the frequency component of commercial AC power supply is arranged on the line between an current controller in a current control system and a modulation circuit in the conduction control signal generating circuit. The circuit is formed so that a DC offset component which is generated in a controlled rectifier equipment may be eliminated.

Abstract: An electric power conversion apparatus is provided which can protect the electric power conversion circuit against an overcurrent even when the interrupting circuit for preventing an inflow of an overcurrent into the input side caused by phase deviations between an input voltage and an output voltage uses switching means with a slow responsiveness. The switching means used in the interrupting circuit 2 have a slower response speed than those of semiconductor switching elements. The overcurrent detection circuit 3 checks whether the input current is an overcurrent. For as long as an overcurrent is detected by the overcurrent detection circuit 3, the command input blocking circuit 4 blocks the instantaneous current control signal and the instantaneous voltage control signals from being fed into the drive signal generation circuit 5. As the duration of overcurrent increases, the interrupting circuit 2 is activated to interrupt the current inflow.

Abstract: In an outer rotor type spindle motor in which a shaft 2 and a stator 3 are supported by and fixed to a flange 1, damping members 4 and 5 are interposed between the flange 1 and the stator 3 and between the flange 1 and the shaft 2, or the flange 1 itself is formed of a damping material. Thus, electromagnetic vibration from the stator 3 or rotating vibration from the shaft 2 are damped and absorbed by the damping members 4 and 5. Accordingly, the generation of vibration or noise in the flange can be prevented which is caused by the transmission of the electromagnetic vibration generated on the stator due to an alternating current supplied to a stator coil or by the transmission of the rotating vibration of a rotor received by the shaft to the flange.