32results about How to "Increase rotor speed" patented technology

A system and method are provided for variable speed operation of a screw compressor to obtain increased capacity and efficiency. The screw compressor is connected to an induction motor driven by a variable speed drive, wherein the screw compressor has a variable output capacity that is dependent on the output speed of the motor. To obtain increased capacity and efficiency, the screw compressor is operated at a speed greater than the screw compressor's rated speed and does not include a slide valve. The maximum operating speed of the screw compressor, which speed is greater than the rated speed, is related to the maximum operating speed of the motor when operated at a voltage and frequency provided by the variable speed drive that is greater than the motor's rated voltage and frequency in a constant flux or constant volts/Hz mode.

A self-power magnetic current changing intelligent vibration damping system consists of electromagnetic adjustable magnetic current changing damper, rack gear accelerator and permanent magnet DC generator, the piston rod of said damper is fixed and connected with the racks of accelerator, and the final pinion of accelerator is installed on said DC generator axle, the outlet end of the DC generator is connected with the electromagnetic coil receiving terminal of said damper, and controller is installed between the outlet end of said DC generator and the electromagnetic coil receiving terminal of the damper. The kernel technology of the invention is: it integrates the sensor of structure vibration and the power-supply source of magnetic current changing damper on small-sized permanent magnet DC generator. The invention applies to the vibration damping of civil engineering structure, it can realize semi-active real-time control without extraneous power source, reduce the system cost, and it is reliable, stable, simple and practical and has obvious self-adaptive characteristics.

Disclosed is a method of controlling the power input to a HVDC transmission link, which HVDC transmission link is connected to an AC power plant via a first voltage source converter and to AC grid via a second voltage source converter, which method includes using the second voltage source converter to perform voltage control of the HVDC transmission link during a no-fault mode of operation of the grid; monitoring a HVDC transmission link parameter to detect an unbalanced fault; and using the first voltage source converter to regulate the output of the AC power plant on the basis of the monitored HVDC transmission link parameter in the event of an unbalanced fault. Also described are a control module for controlling the power input to a HVDC transmission link; a voltage source converter for a power plant; and a power generation and transmission arrangement.

A system and method for efficiently maneuvering a multirotor drone having a control system, an electrical power source, a plurality of rotor assemblies each having a rotor boom, a rotor mast, at least one rotor blade, a rotor assembly adjustment apparatus, a plurality of electric motors, wherein each electric motor is connected to a rotor boom positioned in a substantially horizontal direction and drives a rotor mast positioned in a substantially vertical direction and connected to at least one rotor blade, with the position of said rotor boom automatically adjustable in a substantially horizontal direction by the adjustment apparatus and the control system.

A means for using body energy to generate electrical current to power the electronics, sensors, actuators and other electronic components in microprocessor-controlled prosthetic or orthotic joints. Furthermore, a means for using the generator to provide swing-phase damping is disclosed whereby the damping level can be controlled and adjusted electronically.

A washing machine comprises an outer tub, an inner tub, a pulsator and a driving means having two rotors, a stator and a deceleration mechanism. One rotor drives the pulsator, and the other rotor drives the inner tub. During washing, the two rotors drive the pulsator and the inner tub to rotate in the same or opposite directions, and during dehydration, the pulsator and the inner tub rotate in the same direction and at the same speed. The automatic washing machine saves on energy consumption, has stable output and has high transmission efficiency.

The invention relates to a production method of superfine high count yarn. According to the technology, fiber sequentially goes the procedure of cotton grabbing, dedusting, heavy article impurity removing, cotton opening, cotton condensing, cotton combing, strip combining and rotor spinning yarn. The quality of superfine high count yarn reaches the quality of ring spinning. The production method of superfine high count yarn has the characteristics of high speed, high yield, large coiling block, short technology of rotary spinning, ensures spinning quality and improves the spinning speed at the same time.

The invention discloses a suppression method for subsynchronous resonance of an asynchronous wind power generator system by a UPFC (Unified Power Flow Controller). The suppression method is used for monitoring a current passing through the UPFC, the current is adjusted by a feedback stage to control corresponding reactive power, a voltage of a machine end is adjusted to a normal level, so that a certain damping torque is generated in a power generator, and the subsynchronous resonance is suppressed; and meanwhile, at a series connection side of the UPFC, the reactive power of a circuit is changed by changing a voltage of the series connection side, a reactive current in the asynchronous wind power generator system is affected by change of the reactive power of the circuit, a mechanical torque is considered to be constant in an electromagnetic transient condition, the rotational speed of a rotor of the asynchronous power generator is increased due to increase of an inductance current, the damping torque under a subsynchronous frequency is generated, and the subsynchronous resonance is suppressed. By the suppression method, the stability of a wind power plant system is improved, meanwhile, subsynchronous damping in the system can also be increased, and the subsynchronous resonance of the wind power generator can also be suppressed.

A method and apparatus for optimized crossing of natural frequencies of a rotorcraft rotor are disclosed. The method may include flying a rotorcraft comprising an airframe, a rotor, a mast extending to connect the rotor to the airframe, a tilt mechanism, and a computer system. The computer system may identify during the flying, an impending crossing of a natural frequency of the rotor. In preparation for the crossing, the computer system may issue at least one command to the tilt mechanism. In response to the command, the tilt mechanism may reorient the mast with respect to the airframe. That reorientation quickly results in a change to the rotational speed of the rotor, moving it quickly across the natural frequency. The reorientation may also prevent the rotor from experiencing any significantly deleterious flapping loads during the crossing of the natural frequency.

A direct orientation vector rotor (DOVER) for use on rotary wing aircraft includes a gear set for multidirectional rotor orientation based on the spherical coordinate system; an inclination mechanism, wherein the rotor is moved from the 0° horizontal position to an inclined position; a rotational turret, wherein the rotor is moved along the azimuth and wherein the inclination mechanism is housed; and a motion-adapted gear lubrication housing.

A method and apparatus for reducing flapping loads imposed on a rotor are disclosed. The method may include flying a rotorcraft comprising an airframe, a rotor, a mast extending to connect the rotor to the airframe, a tilt mechanism, at least one sensor, and a computer system. The computer system may obtain in real time, from the at least one sensor, data characterizing at least one flapping load experienced by the rotor during the flying. Using the data, the computer system may issue at least one command to the tilt mechanism. In response to the command, the tilt mechanism may reorient the mast with respect to the airframe. This reorienting may lower the flapping load experienced by the rotor.

The invention discloses a small wind driven generator. The small wind driven generator comprises a fan, a motor, a case, a rotary body and a vertical rod, a driving bevel gear and a driven bevel gear are adopted to transmit the torque of the fan to the motor so as to generate electricity, and the two bevel gears have a certain gear ratio, so that the rotating speed of a rotor of the motor can be increased, and even if the rotating speed of wind wheel blades of the fan is low under the condition of low wind speed, the rotating speed of the rotor of the motor is increased through the two bevel gears, and the power generation efficiency of the motor in a breeze state is also ensured; and by optimizing the structural arrangement of each component, the overall weight of the motor is close to the center of the vertical rod, so that the whole fan can reach a better balance state, and meanwhile, the mounting position of a tail vane is optimized, the overall size of the generator can be reduced, the weight is reduced, the tail vane is connected with a mounting seat in a new connecting mode, the connecting mode is simplified, and later adjustment and maintenance are facilitated.

The invention relates to a rotor spinning unit capable of eliminating a vortex. The rotor spinning unit comprises a vortex eliminating channel, the vortex eliminating channel comprises a fiber transmission channel and a bypass channel communicating with the atmosphere; the central axis of the bypass channel and the central axis of the fiber transmission channel are on the same straight line, the bypass channel is located in the opposite direction of the fiber transmission direction of the fiber transmission channel; and a fiber transmission channel inlet for separating the fiber transmission channel from the bypass channel is formed in one side of the vortex eliminating channel, the vortex eliminating channel is connected with a corresponding gap of a carding roller shell through the fiber transmission channel inlet, then the vortex eliminating channel communicates with a rotor in the rotor spinning unit, the other side of the vortex eliminating channel is a straight side without a gap, the area A of a bypass channel hole of the bypass channel, an increment delta Q of air flow flowing in the rotor, an actual negative pressure Pin in the rotor and a set negative pressure P in the rotor meet the numerical relationship as follows: A=-52.72+7.6 deltaQ-0.0039 Pin and delta Q=5.8-0.0006 P, the bypass channel is additionally arranged to directly supplement air, the vortex of the spinning unit is eliminated, and the fiber straightness is improved.

The invention discloses an efficient hydroelectric generator. The efficient hydroelectric generator comprises a driving device, a main shaft and an electricity generation device. The driving device is connected with the electricity generation device through the main shaft. The main shaft penetrates the electricity generation device. The driving device comprises a three-fork body. The three-fork body is provided with a water inlet and two water outlets. The two water outlets are each provided with a water turbine. A rotating shaft is arranged on each water turbine. A gearbox is arranged on each rotating shaft. A flow guiding cylinder is arranged on the electricity generation device. A gradual expansion water outlet and a gradual contraction water catchment opening are formed in the flow guiding cylinder. A gradual contraction water inlet is formed in the gradual expansion water outlet. The efficient hydroelectric generator is simple in design and high in water energy utilization rate and electricity production quantity.

A method for operating a wind turbine connected to a power grid in response to one or more grid events occurring in the power grid includes monitoring, via one or more sensors, the power grid (such as a frequency thereof) so as to detect one or more grid events occurring in the power grid. In response to detecting one or more grid events occurring in the power grid, the method includes increasing mechanical inertia of a rotor of the wind turbine during a first time frame after one or more grid events occurs in the power grid. After the first time frame, the method includes providing a required additional power output to the power grid during a subsequent, second time frame so as to stabilize the power grid after one or more grid events occurs in the power grid.