Abstract: A motor control device is configured to drive a first motor that rotates a first rotation body and a second motor that rotates a second rotation body. The motor control device includes a power supply unit, inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor, and a control unit configured to drive the second motor using rotor position sensorless control. The control unit may be configured to not start up the second motor during a predetermined operation in which a large current flowing through the first motor is being performed.

Abstract: A motor control device is configured to drive a first motor that rotates a first rotation body. and a second motor that rotates a second rotation body. The motor control device includes a power supply unit, inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor, and a control unit configured to drive the second motor using rotor position sensorless control. The control unit may be configured to not start up the second motor during a predetermined operation in which a large current flowing through the first motor is being performed.

Abstract: There is provided a compressor and an air conditioner capable of preventing a piston from being locked to a cylinder by iced matters. A compressor operation control section 18 of a control unit 20 stops the piston 2 in a high-temperature region HR of comparatively high temperatures where frost or ice of an inner circumferential surface of the cylinder 1 is less easily generated. As a result, generation of iced matters between the high-temperature region HR of the inner circumferential surface of the cylinder 1 and the piston 2 is prevented, so that a lock of the piston 2 due to iced matters can be prevented.

Abstract: A motor drive control device for controlling the driving of a brushless motor includes position detecting units (e.g. sensors or Hall elements), a drive signal determining unit and a drive signal outputting unit (an output circuit). The position detecting units are disposed in positions apart from each other by an electric angle of 120 degrees and output position detection signals representing the position of the rotor with respect to the stator. The drive signal determining unit determines drive signals for driving the 3-phase drive coils on the basis of the position detection signals. The drive signal outputting unit generates and outputs, to the 3-phase drive coils, the drive signals that have been determined by the drive signal determining unit.

Abstract: A motor drive control device for controlling the driving of a brushless motor includes position detecting units (e.g. sensors or Hall elements), a drive signal determining unit and a drive signal outputting unit (an output circuit). The position detecting units are disposed in positions apart from each other by an electric angle of 120 degrees and output position detection signals representing the position of the rotor with respect to the stator. The drive signal determining unit determines drive signals for driving the 3-phase drive coils on the basis of the position detection signals. The drive signal outputting unit generates and outputs, to the 3-phase drive coils, the drive signals that have been determined by the drive signal determining unit.

Abstract: There is provided a compressor and an air conditioner capable of preventing a piston from being locked to a cylinder by iced matters. A compressor operation control section 18 of a control unit 20 stops the piston 2 in a high-temperature region HR of comparatively high temperatures where frost or ice of an inner circumferential surface of the cylinder 1 is less easily generated. As a result, generation of iced matters between the high-temperature region HR of the inner circumferential surface of the cylinder 1 and the piston 2 is prevented, so that a lock of the piston 2 due to iced matters can be prevented.

Abstract: A seamless polyimide composite tube which includes a polyimide layer, a conductive primer layer on the surface of the polyimide layer and a fluororesin layer on the surface of the primer layer and a method of manufacturing the composite tube.

Abstract: A seamless polyimide composite tube which includes a polyimide layer, a conductive primer layer on the surface of the polyimide layer and a fluororesin layer on the surface of the primer layer and a method of manufacturing the composite tube.