57results about How to "Rotational speed" patented technology

A friction stir tool is provided to perform friction stir riveting using a partially consumable pin, wherein the pin includes a cutting edge on a bottom surface thereof, wherein the tool is rotated at a first speed to enable cutting by the pin into a first material that is overlapping a second material, wherein after the pin has cut to a sufficient depth, the rotational speed of the tool is increased to thereby enable plasticization of the consumable pin, the first material, and the second material, wherein the tool is then rapidly decelerated until stopped, enabling diffusion bonding between the pin, the first material and the second material.

The present invention provides, in a vehicular power transmitting apparatus including a differential portion electrically controlled, a control device which can quickly decrease the engine rotation speed, even if the operational state of an electric motor is limited. An engine-stop controlling means (112) includes limiting means for limiting the differential state of a differential portion (11) by a switching brake (B0) and a switching clutch (C0) when the operational state of a first electric motor (M1) is limited. Therefore, a torque in a direction for decreasing a rotation speed (NE) of an engine (8) is applied by limiting the differential state of the differential portion (11), for example, in a vehicle stopped state. As a result, the rotation speed (NE) of the engine (8) is quickly decreased to pass through a resonance point in a short time, whereby occurrence of resonance phenomena can be prevented.

A brake system includes an electric brake force generator which brakes a wheel using a driving force of an electric motor and an electric motor controller that performs a field-weakening control of the electric motor. The electric motor controller performs the field-weakening control of the electric motor which then operates the electric brake force generator. Thus, the rotational speed of the electric motor is increased when the field weakening control is performed by the electric motor controller thereby quickly activating the electric braking force generator to enhance response of brake force generation.

A self-propelled crushing machine comprises a crushing device 20; a hydraulic drive system including a crushing device hydraulic motor 21 for driving the crushing device 20, a first hydraulic pump 62 for driving the crushing device hydraulic motor 21, and an engine 61 for driving the first hydraulic pump 62; a pressure sensor 151 for detecting a load condition of the crushing device 20; and a controller 84″ for executing control to increase a revolution speed of the engine61 in accordance with a detected signal from the pressure sensor 151. Accordingly, even when a heavy load is imposed on the crushing device, a reduction of crushing efficiency can be prevented.

An object of the present invention is to provide a method of polishing semiconductor wafer by using a double-sided polisher which prevents a polish-sagging in an outer periphery of the wafer and thereby improves a degree of flatness of the semiconductor wafer. During polishing of the semiconductor wafer by using a double-sided polisher, a larger difference as compared to the prior art is created between a frictional resistance acting on a front surface of a silicon wafer W from an upper surface plate 12 side and a frictional resistance acting on a back surface of the silicon wafer W from a lower surface plate 13 side. This is because the present invention has employed a hard expanded urethane foam pad 14 and a soft non-woven fabric pad 15, which have different friction coefficients to the silicon wafer W from each other. Thereby, respective wafers W can be rotated at such a high speed as 0.1-1.0 rpm within corresponding wafer holding holes 11a. Accordingly, the rotation of the wafer would not be suspended even if there were any defective condition induced during polishing. Further, partial variation or deviation in polishing volume particular in the outer periphery of the wafer would be hard to occur. Therefore, the polish-sagging is suppressed and thus the improved degree of flatness of the wafer W could be obtained. Further, during this polishing, the semiconductor wafer is polished in a state in which a part of the outer periphery of the semiconductor wafer is protruded by 3-15 mm beyond said respective polishing cloths. During polishing, the outer periphery of the wafer is polished while passing through its non-polishing region at each time when the semiconductor wafer is rotated by a predetermined angle. Therefore, a contact area per unit time of the outer periphery of the wafer with the polishing cloths is reduced as compared to the central region of the wafer. As a result, the polish-sagging in the outer periphery of the wafer is suppressed and the degree of flatness of the wafer is improved.

In a microsensor with a micro-electromechanical sensor element and an integrated circuit for measuring, calibration and compensation electronics, whereby the sensor is connected electrically to the integrated circuit (IC), the micro-electromechanical sensor element is arranged directly on the integrated circuit with accurate positioning, and is connected with electric conductivity via a circulating soldered joint.

A friction stir tool is provided to perform friction stir riveting using a partially consumable pin, wherein the pin includes a cutting edge on a bottom surface thereof, wherein the tool is rotated at a first speed to enable cutting by the pin into a first material that is overlapping a second material, wherein after the pin has cut to a sufficient depth, the rotational speed of the tool is increased to thereby enable plasticization of the consumable pin, the first material, and the second material, wherein the tool is then rapidly decelerated until stopped, enabling diffusion bonding between the pin, the first material and the second material.

An axial fan wheel, in particular for the radiator of a motor vehicle engine, is described. The axial fan wheel includes a crown ring having a multiplicity of rotor blades, a hub having an inner ring which is connected or connectable to a drive shaft, and having, for the purpose of torque transmission, connection surfaces along an outer periphery of the hub which are connected to the inner ring and to the crown ring. The hub has through-passages between the inner ring and the outer periphery. At least one element, arranged rotationally fixedly on the axial fan wheel inside the crown ring, is designed to maintain a pressure difference in the axial direction when the axial fan wheel rotates.

A fan control system includes first and second adjacent fans, first and second motors configured to rotate the first and second fans, and a control unit configured to control rotational speeds of the first and second motors in order to control rotational speeds of the first and second fans. The first and second motors are energized such that the rotational speeds of the first and second fans reach target rotational speeds prior to increasing the rotational speeds of the first and second fans to required rotational speeds. The target rotational speeds are lower than the required rotational speeds. The first and second motors are energized such that the rotational speeds of the first and second fans reach the required rotational speeds after the rotational speeds of the first and second fans reach the target rotational speeds.

By driving a first electromagnetic solenoid and a second electromagnetic solenoid, if first cams of a first thrust force amplification mechanism and a second thrust force amplification mechanism are connected to non-rotary members, since second cams are rotated at rotating speeds that are proportional to a vehicle speed V, the relative rotations between the first cam and the second cam increase. Therefore, the first thrust force amplification mechanism and the second thrust force amplification mechanism can be actuated quickly, to thereby switch connection/disconnection states of the first connection/disconnection mechanism and the second connection/disconnection mechanism quickly.

A device having a directly driven rotating body (1), its circumference (11) being radially seated on radial bearings (4, 4′) in relation to the stationary body (2), and its at least one first face side (10) being axially seated in relation to the stationary body (2), wherein aerostatic bearings (5, 5′, 5″) are provided for the axial support mounting, characterized in that the first face side (10) has an annular magnet arrangement (32), which is configured coaxially to the axis of rotation (X) of the rotating body (1), and that the stationary body (2) has at least one electric coil arrangement (30), which is located opposite the annular magnet arrangement (32) in the axial direction and which forms together with the annular magnet arrangement (32) the components of an electrical direct drive (3) for the rotating body (1).

A BBW type brake system which operates fluid pressure generators having electric motors as drive sources based on an electrical signal to brake a wheel, field weakening control of the electric motors is performed in the initial stage of operation of the fluid pressure generators to increase the rotational speed of the electric motors. Therefore, it is possible to reduce a time lag before the braking force actually generates after the electrical signal for operating the fluid pressure generators is outputted, thereby improving operational responsiveness. After the braking force actually generates, the field weakening control is cancelled to secure a required braking force with a sufficient torque.

A rotation sensor includes a magnetic sensor array (5) including magnetic sensor elements (19) in line, a rotatable magnet (4) confronting the magnetic sensor array (5), a signal readout circuit (11) for reading out a signal from the magnetic sensor array (5), a repeating section (13) for causing the signal readout circuit (11) to repeat reading out the signal from the magnetic sensor array (5) several number of times, and calculating a summation or an average of several readout signals, and an angle calculating circuit (14) for detecting an angle of rotation of the magnet (4) from the summation or the average of the signals calculated by the repeating section (13).

A sheet takeout mechanism has a takeout roller that rotates in contact with a sheet located at a takeout position, and a motor that intermittently rotates the takeout roller. A triangular suction port is formed on a suction surface of the takeout roller and has a vertex located downstream in a rotation direction of the takeout roller. When a negative pressure is exerted on the sheet via the suction port, the suction force is weak at the beginning of suction and then increases gradually.

A device for conveying a bulk material comprises a base with a bearing suit to provide a bearing for the device so that it rotates about a rotation axis, a conveyor unit projecting out from the base, a roof for the base and the conveyor unit, and a drive. The conveyor unit forms at least a transverse conveyor for conveying the bulk material transversely to the rotation axis or at least one feeding conveyor for feeding the bulk material to a transverse conveyor of this type. The roof is joined to the base so as to rotatable about the rotation axis. The invention also includes a drive, so that the roof can be driven in rotation relative to the base.

An internal teeth oscillating inner gearing planetary gear system, wherein installation space for piping, wiring, etc. can be easily secured in the central portion of the system according to a particular application. The gear system is configured such that rotation of an input shaft is reduced by internal teeth oscillating bodies oscillatingly rotating with respect to an external gear. Eccentric shafts are plurally provided. Eccentric shaft gears are provided for the plurality of eccentric shafts, respectively. A transmitting external gear with which the eccentric shaft gears and a driving source-end pinion concurrently mesh is also provided.

An image forming apparatus to form an image electro-photographically is provided. The image forming apparatus includes a housing formed to have an opening; a cover being movable between an open position and an exposing position and having a ventilation port, through which air is allowed to flow; a cartridge having a developer roller and being detachably attached to a body of the image forming apparatus through the opening; a discharging fan arranged on an opposite side from the opening across the cartridge; a handle arranged on the cartridge to extend from the cartridge in a direction toward the opening in an upper position with respect to the ventilation port, when the cartridge is attached to the body and the opening is covered by the cover; and a facing part arranged on the cover to face the handle in a vertically displaced position with respect to the handle.

In an automatic transmission control device, multiple electromagnetic valves control fluid pressure of working fluid to be applied to multiple friction elements of an automatic transmission device, so that a transmission gear is changed by engaging some of the friction gears and/or disengaging the other of the friction elements. The electromagnetic valve controls its output pressure in such a manner that the output pressure is temporally increased when starting the transmission gear change. A maximum fluid pressure is selected from the output pressures of the multiple electromagnetic valves and is applied to a pressure control valve, which controls a fluid control pressure applied to a capacity varying device for changing a discharge amount of a pump. As a result, the fluid pressure applied to the friction elements can be rapidly increased at proper timings.

A discharge tray apparatus according to one embodiment of the present invention is a discharge tray apparatus wherein a plurality of sheets of recording paper that have been successively transported at a fixed speed and a fixed interval, discharged from a discharge opening, and have landed on a discharge tray, are received and placed onto the discharge tray, the discharge tray apparatus being provided with a discharge tray moving means that performs a tray shift operation that moves the discharge tray in a horizontal direction approximately perpendicular to the discharge direction, such that after a preceding paper successively transported earlier has been placed on the discharge tray, a succeeding paper succeedingly transported after the preceding paper is placed at a position different from the placement position of the preceding paper on the discharge tray. This discharge tray moving means performs the tray shift operation with a decelerating movement that reduces the movement speed of the discharge tray just before movement of the discharge tray stops.

A closed-loop control device of a mechanical sewing machine includes an isolated switch-mode power supply module, a DC motor, a speed control module, a processor, an electronic switch, a current detection module and a voltage detection module. The isolated switch-mode power supply module rectifies an AC power to a DC power and supplies the DC power to the DC motor. The speed control module sends a speed signal to the processor. The processor adjusts an output voltage to the DC motor according to the speed signal. The current detection module and the voltage detection module further detect an operating current signal and an operating voltage signal of the DC motor for the processor to control a turn-on time of the electronic switch to adjust an average operating voltage of the DC motor according to the operating current signal, the operating voltage signal and the speed signal.