71results about How to "Unstable operation" patented technology

A technology, wherein unstable operation of the ultrasonic motor is prevented, when the ultrasonic motor is driven at the lower speed out of at least two types of speeds, and life extension is attempted, is disclosed, and according to this invention, when the ultrasonic motor 3 is driven at a comparatively low-speed during normal driving, unstable operation due to driving at a comparatively low-speed can be prevented and life extension can be attempted by driving the ultrasonic motor at a comparatively high-speed every predetermined period of time.

According to an aspect of the present invention, there is provided a power tool including: a motor; a driving circuit that supplies an electric power from a power supply to the motor; a control part that sets a target rotation number for the motor in accordance with a mode selected from a plurality of modes, each mode having a corresponding target rotation number; and a voltage detecting circuit that detects a voltage of the power supply, wherein the target rotation number is varied based on the detected voltage.

A dual video decoder of a digital broadcasting receiver is provided. The decoder includes: a first PES decoder for decoding a first video PES outputted from a first system decoder, into a first video ES; a second PES decoder for decoding a second video PES outputted from a second system decoder, into a second video ES; a VBV (Video Buffer Verifier) buffer memory divided into a first video ES region and a second video ES region; a decoding controller for outputting a control signal to determine a to-be-decoded video ES among the first and second video ESs, and independently decode the first and second video ESs in a single decoding unit; and the single decoding unit for reading the to-be-decoded video ES from the corresponding region of the VBV buffer memory.

An inverted pendulum type moving body according to the present invention includes: first actuators that rotationally drive wheels each disposed on an axle; and a turning motion control portion that controls the first actuators when the inverted pendulum type moving body comes into contact with an obstacle so as to allow the inverted pendulum type moving body to perform a turning motion.

A dedicated power supply apparatus includes a regulator that receives power from an external power source, two signal lines to which the regulator is connected, and two resistors, each placed between the regulator and an associated one of the two signal lines.

A constant voltage circuit is disclosed that includes an output control transistor and an overcurrent protection circuit. The overcurrent protection circuit includes a proportional current generation circuit part, a current division circuit part, a division ratio control circuit part, a current-voltage conversion circuit part, and an output current control circuit part. When the output voltage of the current-voltage conversion circuit part reaches a predetermined voltage, the output current control circuit part prevents an increase in the output current of the output control transistor so as to reduce a voltage output from an output terminal. When the voltage output from the output terminal is reduced to a predetermined limit voltage, the division ratio control circuit part changes the division ratio of the current division circuit part so that a current supplied to the current-voltage conversion circuit part increases so as to reduce the output current of the output control transistor.

A temperature fuse protection device uses a hot melt metal to rivet for connecting two terminals in the circuit that are separated for making the two terminals electrically-connected and the circuit complete. There is a spacing in between the two free ends of the two terminals when no external force is being imposed. When an electric overloading or high circuit temperature event occurs, the hot melt metal would be heated to melt and break, which would then make the free ends of the two terminals to be disconnected, and therefore, the circuit will be at “OFF” status.

A communication operation is suitably performed with application of Space Division Multiple Access in which wireless resources on a space axis are shared by a plurality of users.

If a frequency width is narrowed to 20 MHz when the communication quality is high, the amount of transmittable data can be about half, and the frame length can be doubled. If the frame length is rather excessively long, switching is performed to a modulation scheme with the greater number of states to shorten the frame length. On the other hand, when the communication quality is low, switching is performed to a modulation scheme with the smaller number of states to lengthen the frame length. When the frame length is still insufficient, switching is performed to a narrow frequency width to lengthen the frame length.

An inverter control device for driving a motor with small size, light weight and low cost is provided. The inverter control device includes a first motor voltage command corrector that corrects a voltage command of each phase by multiplying the each phase voltage command by a PN voltage correction coefficient, and a second motor voltage command corrector that corrects again the each phase voltage command once corrected by the first motor voltage command corrector, only when any one of the phase voltage commands corrected by the first motor voltage command corrector is larger than the inverter DC voltage, by multiplying the voltage command of each phase corrected by the first motor voltage command corrector by the inverter DC voltage value, and dividing the product of the multiplication by the maximum value of the phase voltage commands corrected by the first motor voltage command corrector.

A method for blending at least two hydrocarbon liquids, the method comprising: (a) determining the critical solvent power for each hydrocarbon liquid by (i) mixing each hydrocarbon liquid with predetermined amounts of a paraffin; (ii) centrifuging each resulting mixture; (iii) recovering and weighing any resulting precipitated insolubles from step (ii); and (iv) correlating the weight of the insolubles in step (iii) to the solvent power at which asphaltenes begin to precipitate out of the hydrocarbon; (b) determining the solvent power for each hydrocarbon liquid by: (i) determining the distillation curve and density of each hydrocarbon liquid; (ii) numerically integrating the distillation curve of each hydrocarbon liquid, producing the volume average boiling point for each hydrocarbon liquid; (iii) calculating the characterization K factor for each hydrocarbon liquid using the volume average boiling point in step (ii); and (iv) determining the solvent power of each hydrocarbon liquid using the characterization K factor in step (iii), wherein heptane and toluene are used as solvent power references wherein heptane has a solvent power of zero and toluene has a solvent power of 100; and (c) blending the each crude oil into each other producing a crude oil blend wherein the solvent power of the crude oil blend is greater than the critical solvent power of the crude oil having the highest critical solvent power in the blend.

Disclosed is a method and an apparatus for exchanging heat in a column by passing a first vapor phase through a heat exchanger in the column to exchange heat with a first stream and produce a second vapor phase in the column. The second vapor phase is passed through a shielding device located above the heat exchanger and the shielding device prevents descending liquid from contacting the heat exchanger. The shielding device may be interposed between two heat exchangers in the column.

An exhaust gas recirculation apparatus of an engine with a supercharger, which prevents retention of a large amount of condensed water at the downstream side of an EGR valve, with the condensed water being generated by EGR gas leaked to the downstream side of the EGR valve during full closing of the EGR valve, is provided by the invention. The engine (1) is provided with the supercharger (7) and a low pressure loop EGR apparatus, wherein an electronic control unit (ECU) (50) controls the EGR valve (18) to be fully closed when a detected operating condition is a predetermined operating condition. An outlet (17a) of an EGR passage (17) is located at a higher position than an inlet (17b) in a vertical direction to allow condensed water to flow downward from downstream to upstream of the EGR valve (18) and flow downward through the EGR passage (17) to an exhaust passage (3). When the EGR valve (18) has to be controlled to be fully closed, to discharge the condensed water from a downstream side of the EGR valve (18), the ECU (50) forcibly opens the EGR valve (18) when a predetermined discharge condition is established.

A vacuum cleaner and a control method thereof, wherein the vacuum cleaner includes a vacuum cleaner body, a floor brush assembly, and an extension tube connecting the two together. The floor brush assembly comprises a plurality of different floor brushes for performing different cleaning work. The vacuum cleaner is further provided with a control unit and a detection unit. The detection unit comprises a floor brush current detection module for detecting current passing through an electric motor in a floor brush. The floor brush current detection module sends detection signals to the control unit, and the control unit controls the electric motor to maintain an operating state or stop the operating state according to the detection signals.

An object of the present invention is to provide a DC test apparatus capable of reducing wasteful standby power consumption. The DC test apparatus has a power amplifier circuit 130 for supplying a current to a DUT during a test. The power amplifier circuit 130 is provided with transistors 18 and 20 for generating an output current appropriate for an input voltage during current supply, resistors 54 and 56, and a variable resistance circuit 40 for setting a standby current flowing through these transistors 18 and 20 and the like during current supply to a smaller value at any time other than during current supply.

A heat exchange apparatus for circulating fluidized bed boilers is disclosed. The heat exchange apparatus for circulating fluidized bed boilers includes a particle separator configured to separate an exhaust gas and a flow medium discharged from a combustion furnace, an external heat exchanger into which the flow medium collected in the particle separator flows and which is configured to heat a heat transfer medium by heat exchange with the flow medium, and a flow control unit installed at the external heat exchanger and configured to supply air to a flow path of the flow medium and to regulate an internal temperature of the external heat exchanger under the control of a flow direction and a flow quantity of the flow medium.

A magnetoresistance effect element includes a recording layer containing a ferromagnetic body, and including a first fixed and second magnetization regions having magnetization components fixed substantially in a direction antiparallel to the in-plane direction to each other, and a free magnetization region disposed between the first and second fixed magnetization regions and having a magnetization component invertible in the in-plane direction, a domain wall disposed between the first fixed magnetization region and the free magnetization region, and being movable within the free magnetization region, and a magnetic nanowire having a width of 40 nm or less. The thickness of the recording layer is 40 nm or less and at least half but no more than twofold the width of the magnetic nanowire. The element further includes a barrier layer disposed on the recording layer, and a reference layer disposed on the barrier layer and containing a ferromagnetic body.

As an apparatus to prevent the excess adsorption of oxygen molecules caused by excess supply of raw material air and the reduction in the level of generated oxygen caused by concentration of argon, which occur when a predetermined value of an oxygen supply flow rate is in a low flow rate zone, to suppress the electric power consumption and to stably drive a compressor, the present invention provides an oxygen concentrator that is a pressure swing adsorption-type oxygen concentrator equipped with; at least one adsorption bed filled with an adsorbent capable of selectively adsorbing nitrogen relative to oxygen, an air supply device to supply compressed air to the adsorption bed, a flow channel switching device to repeat at a predetermined timing an adsorption step to supply air from the air supply device to the adsorption bed to isolate concentrated oxygen and a desorption step to depressurize the adsorption bed to regenerate the adsorbent therein, and a flow rate setting device to set a volume of concentrated oxygen supplied to a user; comprising an exhaust pipe channel equipped with a leak valve in a flow channel between the air supply device and the adsorption bed to release a part of compressed air that is to be supplied to the adsorption bed into atmosphere.