Abstract: An electrically driven compressor includes a rotating shaft, a pair of impellers mounted to the rotating shaft, an electric motor arranged between the individual impellers of the pair of impellers and configured to rotate the rotating shaft, primary bearings, one of which is arranged between one of the pair of impellers and the electric motor, the other of which is arranged between the other of the pair of impellers and the electric motor, the primary bearings being configured to rotatably support the rotating shaft, and a secondary bearing arranged on the side of an end of the rotating shaft relative to the primary bearing in a state where the secondary bearing has a gap with respect to a circumferential surface of the rotating shaft and is configured to be brought into contact with the rotating shaft and rotatably support the rotating shaft when whirling vibration occurs in the rotating shaft.

Abstract: An electric pump includes a housing 2 configured of a housing body 3 and a cover 4, a stator 6 having a plurality of coils 15, a rotor 7 configured of an inner side outer rotor 16 and an outer side rotor body 17, a pump part 8 disposed on the inner circumferential side of the rotor 7 of an electric motor 5, side plates 11 and 12 disposed on both side surfaces of the rotor 7, an inner rotor 9, and a plurality of connecting plates 10 interposed between the outer rotor 16 and the inner rotor 9. The side plate 12 of the side plates 11 and 12 is pressed to the rotor 7 by a compression coil spring 28.

Abstract: A low-voltage detection circuit detects a low voltage using a voltage follower type operational amplifier and an A/D converter instead of a conventional low-voltage detection circuit. That is, a reference voltage is applied from a reference voltage generating circuit to the A/D converter through the voltage follower type operational amplifier. The voltage follower type operational amplifier is used to reduce output impedance. The power supply voltage can be detected by a converted value (a digital value) from the A/D converter since the reference voltage is independent of the power supply voltage and the converted value varies depending on the power supply voltage. The converted value (the digital value) from the A/D converter is set in a register and statuses of a microcomputer are set as in the conventional art, using the converted value as a flag.

Abstract: A low-voltage detection circuit that is small in size and accurate in detecting a reduction in a power supply voltage is offered. The low-voltage detection circuit of an embodiment of this invention detects a low voltage using a voltage follower type operational amplifier and an A/D converter instead of a conventional low-voltage detection circuit. That is, a reference voltage Vref is applied from a reference voltage generating circuit to the A/D converter through the voltage follower type operational amplifier. The voltage follower type operational amplifier is used to reduce output impedance. The power supply voltage Vdd can be detected by a converted value (a digital value) from the A/D converter since the reference voltage Vref is independent of the power supply voltage Vdd and the converted value varies depending on the power supply voltage Vdd.