38results about How to "Increase operating speed" patented technology

The invention discloses a small-hydropower axial flow turbine device. The small-hydropower axial flow turbine device comprises an upper seat ring (1), a lower seat ring (3), sixteen movable guide vanes (2), a support cover (6), a bottom ring (7), a runner chamber (4), a hub (8), a runner cone (9), three blades (10) fixedly mounted on the hub and a straight-cone-shaped draft tube (5), wherein the upper seat ring (1) and the lower seat ring (3) are provided with the guide vanes. The center circle diameter of a water guide mechanism is large, the movable guide vanes and the upper and lower seat rings extend outwards by certain size from a guide vane inlet, the sixteen movable guide vanes which are large in opening are adopted, the runner is high in running speed, inlet and outlet water flow angles of the outer edges of the blades are large, the hub ratio of the runner chamber is low, excess flow is large, the shape contracts at an outlet of the runner and starts to spread again from the straight-cone-shaped draft tube, and numerical simulation shows that efficiency of a turbine can reach 85%. The small-hydropower axial flow turbine device is simple in structure, small in size, convenient to process, low in economic cost and high in efficiency, can be used for low-water-head and high-flow power stations for power generation and can also be used for small-hydropower synergistic expansion modification in the early stage.

The invention discloses a three-phase series winding topological open circuit fault fault tolerance method for balanced modulation wave amplitude. When an open circuit fault occurs and any phase of the three-phase current is zero, the negative sequence current component that appears in the system is extracted and suppressed. Fault-tolerant operation of the motor after a fault is realized. After the positive-sequence and negative-sequence modulation wave components required to control the motor are superimposed, they are redistributed with the constraints of equal amplitudes, and finally the new command values ​​of each bridge arm after the open circuit fault occurs are obtained. The invention proposes for the first time a fault-tolerant control method that can ensure the normal operation of the motor after the bridge arm or winding open circuit fault occurs in the three-phase series winding topology, and effectively improve the amplitude imbalance after the modulation wave is superimposed; Simulation verification is carried out on the motor, and the effect of motor fault tolerance and modulation wave equalization control is remarkable.

The invention relates to a hybrid wind power generation system which is characterized by comprising a wind wheel, wherein the wind wheel is connected with the input end of a gearbox with low speed increasing ratio; the output end of the gearbox with low speed increasing ratio is connected with a winding doubly-fed induction generator by a coupling; a rotor winding of the winding doubly-fed induction generator is connected with one end of a rotor current converter; a stator winding of the winding doubly-fed induction generator is connected with one end of a stator AC-DC-AC converter; the rotorcurrent converter and the other end of the stator AC-DC-AC converter are connected into a power grid. The invention transmits wind power to the power grid by AC-DC-AC conversion, has mature and reliable technology and can be widely applied in the power generation process of converting the wind power into power energy.

A high-precision dynamic gas transmission device for corrugating machinery, which comprises a shaft and a shaft sleeve, the shaft sleeve is provided with evenly distributed ventilation holes, and a gas flow control valve is installed on each row of the ventilation holes, and the shaft shoulder is provided with a gas flow control valve. A seal is installed, and the gap between the shaft and the shaft sleeve is filled with high-pressure gas injected from the vent hole; the end of the shaft enclosed in the shaft sleeve is provided with an annular groove, and at least three displacement sensors are installed on the shaft sleeve The displacement sensors are respectively electrically connected with the PLC central processing unit through the data acquisition system, and the PLC central processing unit is connected with the gas flow control valve installed on the vent hole. The invention can effectively reduce the running friction, save more than 20% of energy, effectively reduce the noise generated by running, prolong the service life of the machine, and increase the running speed by more than 40%.

An aero-engine direct-drive internal rotor starter-generator system, which is applied in the field of unmanned aerial vehicle hybrid electric power, installs and fixes the starter-generator outer stator assembly on the aero-engine through a stator bracket, so that the starter-generator system has a compact structure and Short length, high integration, and high power-to-weight ratio; the coaxiality between the starter generator stator and the engine is ensured through the support of the stator bracket, and the starter generator inner rotor assembly is directly installed on the aeroengine shaft, so that the starter generator system There is no need for bearing support near the engine side, and a single bearing support is used on the far engine side, which reduces the heat generation of the bearing and improves the reliability of the bearing; there is also a resolver at the end of the rotor assembly in the starter generator far away from the aeroengine, which can accurately Detect the position of the rotor, so that the starter generator system can output high-power direct current by means of controllable rectification, and the power generation efficiency is high.

The invention discloses a fan speed control method of an air conditioner, which comprises the following steps: in cooling mode, when ΔT≤T 1 When ΔD i ≤D 00 When , set the optimal noise value of the real-time noise of the environment in this time period to D s , the fan runs at the current speed; compare the real-time noise of the environment in real time D i with D s The difference in order to adjust the speed in time. According to the fan speed control method of the present invention, according to the temperature information and noise information within a certain period, the rotation speed of the fan of the air conditioner is controlled, and the wind speed adjustment level of the air conditioner can be increased. On the one hand, it can meet the user's wind speed requirements for the air conditioner. On the other hand, the air conditioner can also be operated in a low-noise state, so that the operating state of the air conditioner can be subdivided into multiple states, so that the air conditioner can satisfy multiple performances at the same time.

The invention is applicable to the technical field of direct current motor control, and relates to a phase change control method of a direct current brushless motor. The method includes the step of obtaining six Holzer position signals of a rotor of the direct current brushless motor within one cycle; when the last Holzer position signal of the rotor is obtained, starting to conducting timekeeping, stopping timekeeping when the current Holzer position signal is received, and recording the timekeeping time as t; when receiving the current Holzer position signal of the rotor, starting to conducting timekeeping, when the timekeeping time reaches the preset phase change time t / n, controlling a switching tube, corresponding to the next Holzer position signal, in an inverter bridge arm of the direct current brushless motor to open or close, wherein when the current Holzer position signal is the first Holzer position signal within the cycle, the last Holzer position signal is the sixth Holzer position signal of the rotor within the last cycle, and 1<n<=2. Under the condition of ensuring the voltage balance of the motor, the method effectively improves the rotation speed of the motor in running under the condition of constant power.

The invention provides an adaptive intelligent energy-saving control method for pumping units in an oil field, which includes identifying the working state of each stroke of the pumping unit, adjusting the voltage when the pumping unit is in the electric state, adjusting the frequency when the pumping unit is in the power generation state, and returning to normal Several steps such as VF curve, oilfield pumping unit self-adaptive intelligent energy-saving control system includes several modules such as controller voltage and frequency independent VF control module, voltage regulation module, frequency modulation module and return module, the present invention can realize the automatic control of pumping unit Adapt to intelligent energy-saving control, increase the running speed of the motor when the pumping unit is working in the power generation state, and return to the normal running speed when working in the electric state, so as to realize that the number of strokes is not lower than the normal number of strokes in the same time, and the unit time, The oil pumping rate per unit energy will only increase and not decrease. The original VF independent control method of the present invention can automatically reduce the output voltage and output current when no-load, and automatically store energy under power generation, so as to achieve the purpose of energy saving and can be widely used It is used in oil field pumping units, centrifuges, machine tools and other applications with two working modes of electric and power generation.