摘要:
A welding electric current is suppled to a tiltable resistance welding gun having a pair of electrodes which grip a workpiece while effecting resistance welding thereon. A power receiver terminal on the resistance welding gun and a power supply unit are connected to each other when the electrodes grip the workpiece therebetween, and the welding current is supplied from the power supply unit to the power receiver terminal. When the electrodes are separated from the workpiece, the power receiver terminal and the power supply unit are disconnected from each other.
摘要:
A fluid diverging system provides a passageway for supplying a fluid from a single supply source to a plurality of sections requiring the use of the fluid and for discharging the fluid from these sections to a single discharge portion. The fluid diverging system includes a plurality of fluid diverging blocks separably connected to one another longitudinally in a row. Each of the blocks has a through-hole longitudinally passed therethrough, and a communication passage communicating with the through-hole and capable of being connected to external fluid transfer means. Joint means connecting these blocks enable a fluid-tight communication of these blocks with one another. This makes it possible to use the fluid diverging system in an optical form only by increasing or decreasing the number of the fluid diverging blocks in accordance with an increase or decrease in number of the section requiring the use of the fluid.
摘要:
An integrated circuit device has a substrate, a plurality of circuit elements or units arranged on the substrate and having terminals, a plurality of signal lines connected between the terminals of the circuit elements or units, or between the terminals and external connection terminals, and an alternating current ground line provided close to the signal lines to determine a transmission characteristic of the signal lines, the alternating current ground line including a high-potential direct current power source line and a low-potential direct current power source line, the high-potential direct current power source line and the low-potential direct current power source line being vertically separated by a dielectric layer.
摘要:
There is provided a technique that can increase sensitivity of a resonator. A ratio Rb/Ra between an inner diameter Rb and an outer diameter Ra of the resonator 20 is appropriately selected, and thus there may be a fixed point where an r component (U(Ra) or U(Rb)) of displacement in a radial direction and an r component (V(Ra) or V(Rb)) of displacement in a tangential direction are 0 on an outer diameter portion or an inner diameter portion of the resonator 20. In this case, the resonator 20 is supported by a holding member 22 constituted by a single-span beam set so that a boundary condition on a side of the resonator 20 is pinned and a boundary condition on a side of an anchor that supports the resonator 20 is clamped at the fixed point, and this prevents vibration energy of the resonator 20 from being lost through the holding member 22, avoids a state to disturb a vibration mode, and achieves a sensor having high sensitivity.
摘要:
It is an object of the present invention to provide a technique that can realize improvement of sensitivity of a vibrator. A platform 50 to which a substance adheres or sticks is provided to be mechanically coupled to a vibrator 20 of a sensor via bridges 51. Sensitivity of the sensor is improved by causing the mass of a substance adhering or sticking onto the platform 50 as if the substance concentratedly adheres or sticks to places where the platform 50 is connected to the vibrator 20. It is preferable to connect, via the bridges 51, the platform 50 to places where the platform 50 vibrates integrally with the vibrator 20. For this purpose, it is preferable to mechanically couple, via the bridges 51, the platform 50 to regions where vibration occurs only in one of an r direction or a θ direction in the vibrator 20.
摘要:
By using a disc type resonator, a sensor detects a substance having a mass and the mass with high sensitivity. Moreover, it is preferable to detect a change in vibrations of a substance attached or adsorbed to an area having a vibration amplitude equal to or larger than a constant value. This disc type resonator can be fabricated by the MEMS technique by using single-crystal or polycrystalline Si as a structural material. To improve the attachment efficiency of molecules and the like to be detected, irregularity or a groove is preferably provided on the surface of the disc type resonator.
摘要:
A drive circuit for a brushless DC fan motor for rotating a rotor (permanent magnet) by a rotating magnetic field produced by turning on/off the flow of electric current to field coils by a signal to control terminals of switch elements in which switch sections are each connected in series with the field coils. When connecting capacitors for absorbing a current spike in parallel with the switch sections of the switch elements, resistors are each connected between the field coil and switch section, through which the capacitors are connected in parallel with the switch sections. A discharge current of the capacitors which absorbed a current spike when turning on the switch elements is passed via the resistors, thereby eliminating a current spike.
摘要:
The invention enhances a joined portion between a bearing holder and a stator core in a blower. In the blower including a stator core attached to the outer circumference of a bearing holder, a setscrew for impeding the stator core from being pulled out is interposed between the bearing holder and the stator core. The setscrew is used for fixing in place of adhesives which is used in conventional art, ensuring the joining between the bearing holder and the stator core as well as facilitating the disassembling work.
摘要:
A brushless direct current motor drive circuit having a serially connected motor coil energizing circuit, a serially connected feedback circuit, a pre-drive circuit, a position sensor, and a duty ratio controller. This circuit can decrease the heat generation from the switching elements on the power source side, perform absorption of the current flowing back in the direction of the switching elements on the power source side when the duty ratio is set to less than 100% without using an electrolytic capacitor group that causes a shortening of the motor lifetime, and solve various problems caused by the use of an electrolytic capacitor group.
摘要:
To facilitate the assembling work of a motor and to enhance the reliability without limiting the structure of the motor, the iron core 12 of a stator 14 is insulated by insulators 15 and 16, a high heat-resistant resin is applied to a press-fitting portion of each terminal 17 to the insulator 16, and the terminal 17 is inserted into a boss 16a through the high heat-resistant resin so that a transfer of heat from the terminal 17 to the insulator 16 is suppressed. Accordingly, when an end portion of a conductive wire is wound around the terminal 17 and is subjected to the soldering work, even if the terminal 17 receives the heat and is heated, there is no generation of softening in the insulator 16 due to the heat. Accordingly, it is possible to prevent the “removal” or “tilt” of the terminal 17 caused by the heat.