Abstract:
An upper portion of a second clad layer and a contact layer are provided with grooves so as to form a ridge therebetween. An electrode is formed on the ridge. An insulation film is formed to extent on side surfaces of the ridge, on the inside of the grooves, and those portions of the contact layer which are located on the outside of the grooves. The thickness of those portions of the insulation film which are located on the contact layer in the areas on the outside of the grooves is set to be greater than at least the thickness of the electrode. Besides, a pad electrode is formed to cover the electrode and to extend on the insulation film on the upper side of the areas on the outside of the grooves. The upper surfaces of those portions of the pad electrode which are located on the upper side of the areas on the outside of the grooves are set to be above the upper surface of that portion of the pad electrode which is located on the upper side of the ridge.
Abstract:
If the ambient temperature of a pressure volute measured by a temperature sensor exceeds 0° C., a compressor is instantly started at normal operation. If the temperature of the pressure volute measured by the temperature sensor is 0° C. or lower, there is a possibility that a rotary vane may be adhered to the pressure volute due to a congelation. Therefore, vibration along the axial direction is given to the rotary shaft by way of an axial magnetic bearing. If the vibration amplitude of the thus given vibration exceeds a predetermined value, the compressor is started at normal operation after idle operation. On the other hand, if the vibration amplitude is lower than a predetermined value, it is determined that the thus given vibration is unable to eliminate the adhesion of the rotary vane due to the congelation, and the heater is actuated to heat the pressure volute only for a predetermined time. Thereafter, the ambient temperature is detected again, and if the ambient temperature exceeds 0° C., the compressor is started,
Abstract:
A bearing device supporting a rotation shaft of a fuel cell compressor includes a pair of radial foil bearings and mounted in concentric relation to the rotation shaft and supporting the rotation shaft in a radial direction, and an axial magnetic bearing opposed to the rotation shaft in an axial direction and supporting the rotation shaft in the axial direction. A control device includes bearing life diagnostic unit for accumulating times during which a rotational speed of the rotation shaft has been below a predetermined value, so as to obtain a cumulative contact time, thereby judging a bearing lifetime.
Abstract:
A fuel-cell compressed-air supplying device 6 includes a compressor 12 including an impeller 15 provided on one side of a rotation shaft 13 and a turbine 16 provided on the other side of the rotation shaft 13 of the compressor 12. Compressed air is supplied to a fuel-cell stack 2 through the rotation of the impeller 15, and exhaust air exhausted from the fuel-cell stack 2 causes the turbine 16 to rotate.
Abstract:
A sensor-equipped rolling bearing assembly includes: a cylindrical fixed bearing ring fixed to a vehicle body; a rotary bearing ring rotatably inserted through the fixed bearing ring and having a wheel-mounting portion on an outboard side thereof; and plural rows of rolling elements rollably interposed between these bearing rings. The bearing assembly is provided with a case member having plural displacement sensors which are circumferentially arranged at predetermined space intervals and which detect gaps between themselves and an outside surface of an inboard end of the rotary bearing ring. The case member is mounted to the inboard end of the fixed bearing ring.
Abstract:
The magnetic bearing control device (1) has a motor drive circuit (13) provided with an inverter (13a) for driving the motor (4) capable of generating an electric power, the inverter being controlled by an inverter control circuit (14), and an over-speed detection circuit (17) for detecting the number of revolutions of the rotor (3) that is being rotated by the motor (4), the rotor being supported in non-contact manner by a magnetic bearing (5). When the over-speed detection circuit (17) detects that the rotor (3) is being rotated at a preset number of revolutions or more, the motor drive circuit (13) performs a switching operation of a switch portion 13c provided in the motor drive circuit (13) to separate the inverter (13a) from the motor (4) and connect the motor (4) to a regenerative circuit (13b), whereby the magnetic bearing (5) is driven and controlled, employing a regenerative electric power of the motor (4).
Abstract:
A machine tool comprises a spindle unit for raising a spindle on which a cutting tool is mounted by a magnetic force and supporting the spindle. The spindle unit carries out feedback control so as to maintain the spindle in its target position in the radial direction. A feeder for feeding the cutting tool to a work comprises a servo motor for moving the spindle unit relatively to the work. A feeding controller for controlling a feeding operation of the feeder controls the speed of rotation of the servo motor on the basis of feed speed data stored in a memory. The feed speed data comprises a first feed speed corresponding to the time when the cutting tool cuts through an end surface of the work crossing the direction of feeding and a second feed speed corresponding to the time of normal working and higher than the first feed speed.
Abstract:
A magnetic bearing spindle device for machine tools comprises a spindle for mounting a tool element as changeably attached to a forward end thereof, a plurality of controllable magnetic bearings for contactlessly supporting the spindle, an electric motor for rotating the spindle as contactlessly supported by the magnetic bearings, a draw bar inserted through the spindle and axially movable for unclamping and clamping the tool element, state sensor switches for detecting the axial position of the draw bar to detect a state of having no tool element, an unclamping state or a clamping state, and a control unit for controlling the support of the spindle by the magnetic bearings and the rotation of the spindle by the motor based on the result of detection by the switches.
Abstract:
An apparatus for editing a series of moving images recorded across a plurality of recording media including at least a first and second recording media, comprising: an editing unit which performs editing processing on a part of the series of moving images recorded on the first recording medium; a storage control unit which performs control such that the editing processing is stored; a determination unit which determines whether or not a detachable recording medium has been attached; and a control unit which, in a case where it has been determined that the second recording medium has been attached, performs control for applying the editing processing that has been performed on the part of the series of moving images recorded on the first recording medium and has been stored by the storage control unit, to a part of the series of moving images that is recorded on the second recording medium.
Abstract:
A first spacer, a second tubular member, and a second spacer are externally fitted and fixed to an outer peripheral surface of a nut. The second tubular member is formed by stacking a plurality of silicon steel plates without any gap, and is arranged between the first spacer and the second spacer axially. The outer diameter of an outer peripheral surface of the second tubular member is made larger than the outer diameter of an outer peripheral surface of the first spacer and the outer diameter of an outer peripheral surface of the second spacer. A detection surface of a first displacement detector is made to radially face a contact portion between the second spacer and the second tubular member, while a detection surface of a second displacement detector is made to radially face a contact portion between the first spacer and the second tubular member.