33results about How to "Acceleration time is short" patented technology

The invention discloses a quasi-close loop starting method of a brushless direct current motor free of a position sensor, namely a quasi-close loop three-stage starting method with rotor initial position accurate pre-positioning and optimization positioning in the acceleration process combined. Short-time pulse voltage vectors are exerted in a motor winding, the rotor position can be locked in a range within 60-degree electrical angles by detecting direct-current bus current, and rotor accurate pre-positioning is completed by electrifying a designated winding, detecting current and comparing the current on the basis of rotor position locking. After rotor position pre-positioning, rotors enter the optimization positioning and acceleration stage, current differentials serve as the phase change conditions in the threshold range so that the rotors are ensured to change phase accurately in the acceleration process, and a system is switched into a counter electromotive force operation state. Experimental results show that the quasi-close loop three-stage starting method is low in cost and high in reliability, and can ensure that the system is in the quasi-close loop working state in the whole starting process and cannot have step-out and starting failure.

The invention relates to a mixed power vehicle power storage device and an energy adjusting method by virtue of the device, thus leading the mixed power vehicle energy storage device to have great power density and long service life. The technical proposal is that the invention is provided with an accumulator group and a capacitance group; a DC-DC converter is arranged between the capacitance group and the accumulator group; the invention is also provided with an inverter which is respectively electrically connected with the accumulator group, the DC-DC converter and a motor; the invention is also provided with a battery management unit which can control the DC-DC converter according to the voltage value and the current value of the accumulator group and the capacitance group. When a whole vehicle controller judges an automobile in brake state or retarding state according to a vehicle speed signal, a gun signal and a brake pedal signal, the signals are sent to the battery management unit and then enter a regeneration brake mode; the battery management unit controls the DC-DC converter by the voltage value and the current value of the accumulator group and the capacitance group, thus leading a motor working in a generator mode to charge the accumulator group and the capacitance group through the inverter.

The invention relates to equipment for measuring intra-ocular pressure, which is mainly characterized by comprising a probe supported in a probe shoulder, a plurality of coils wound on a framework, and a circuit board for collecting and processing voltage signals of the coils. The probe consists of a plastic probe head and a magnetic probe tail, and the probe tail consists of one or several joints of magnetic needles. The equipment for measuring the intra-ocular pressure is mainly characterized in that the coils are electrified with different directions to drive the magnetic needles at the probe tail to ensure part of the probe head to move toward or far away from a cornea at a high speed, and the intra-ocular pressure is figured out by the time interval between the probe closing to the cornea and the probe just leaving the cornea. By adopting the technical scheme of the invention, the speed-up time of the probe is shortened, the retention time of high speed motion is long, and the system efficiency is high, thereby fully ensuring that the probe can hit against the surface of the cornea at a speed high enough, greatly reducing the complexity and cost of the system, and simultaneously improving the reliability of the system.

The invention relates to a propulsion device without a gear box for the vector control of a permanent magnet synchronous motor of an electric ship. Two power supplies are respectively electrically connected with an FOC (Field Oriented Control) vector control frequency converter through a propulsion operation platform and a cable; the FOC vector control frequency converter is electrically connected with a permanent magnet brushless synchronous motor through a cable; the permanent magnet brushless synchronous motor is coaxially connected with a rotary transformer and a propeller and mechanically connected with a speed indicating generator; the rotary transformer is electrically connected with the FOC vector control frequency converter through a cable; the speed indicating generator is electrically connected with the combined type propulsion operation platform through a cable; and the speed indicating generator and a storage battery are electrically connected with the FOC vector control frequency converter through cables. The invention directly drives the permanent magnet brushless synchronous motor by adopting the vector control without using the gear box and a brake, thereby optimizing the control characteristics of the electric ship and saving the electric energy.

A yarn winding device (11) that produces a conical package (53), includes a traverse guide (17), a traverse driving section (19), a lead ratio setting section (43) adapted to set, as a lead ratio, a value of a ratio of traverse time within a larger diameter region with respect to traverse time within a smaller diameter region of the package (53), or a value of a ratio of traverse speed within the smaller diameter region with respect to traverse time within the larger diameter region of the package, and a speed profile adjusting section (44) adapted to adjust a speed profile of the traverse guide (17) in at least one of the larger diameter region and the smaller diameter region of the package (53) according to the set lead ratio set by the lead ratio setting section (43).

The invention discloses a multi-stage gas homogenizing pore plate structure and a flooded evaporator for preventing suction with a liquid. In the multi-stage gas homogenizing pore plate structure, pore diameters of through holes in each pore plate are formed in a gradual changing mode according to the distance to a suction port of external equipment, and the farther the distance to the suction port is, the greater the diameters of the through holes are. When an air flow enters a baffle plate structure from the lower pore plate, liquid state substances mixed in the air flow are baffled and separated out of the suction port by means of the multi-stage gas homogenizing pore plate structure. The multiple multi-stage gas homogenizing pore plates are combined to play a better flow field homogenizing role, so that a high speed flow field centralized region below the gas homogenizing structure is eliminated, the air flow speed is reduced, and liquid drops are prevented from being taken away bygas. When gas-liquid two phases flow through the multi-stage gas homogenizing pore plates, the accelerating time of the liquid drops is short, the speed is relatively low, and the gas and liquid separated and collided with the next stage gas homogenizing pore plate are unlikely to break, so that the condition that broken relatively small liquid drops follow gas continuously to penetrate the multi-stage gas homogenizing pore plate structure is prevented.

The invention discloses advanced premixing abrasive water jet equipment and a generation method. The advanced premixing abrasive water jet equipment comprises a stirring barrel, a stirrer, a feeding pump, a grouting pump and a nozzle; the stirrer capable of circularly stirring the interior of the stirring barrel is arranged in the stirring barrel; the bottom of the stirring barrel communicates with the input end of the feeding pump through a first pipeline; the output end of the feeding pump communicates with the liquid inlet end of a three-way ball valve through a second pipeline; one liquid outlet end of the three-way ball valve communicates with the stirring barrel through a third pipeline, and the other liquid outlet end of the three-way ball valve communicates with a grouting pump feeding port of the grouting pump through a fourth pipeline; and a grouting pump discharging port of the grouting pump communicates with the nozzle through a high-pressure hose.

A conversion driver wash machine. It contains system of wash and desiccation, drive gear applying revolute force to the system of wash and desiccation, induction motor driving the drive structure and its adjustable power. Adjustable power applies power as potential U1 and frequency f1 when the system of wash and desiccation is turned on or speed is increasing. After a certain time, apply U2 and f2(U1/f1)> (U2/f2).

A cylinder is provided for a spinning preparation machine. The cylinder has an outer shell having a hub at each end of the outer shell. A separate shaft journal is connected to each hub and the shaft journals are glued to the hubs.

The invention discloses a variable speed control technology for preventing wire sliding in downward preparation of a detonating fuse in the processing flow of cable initiating explosive devices, and belongs to the field of processing the cable initiating explosive devices. The variable speed control technology comprises the following steps: firstly, building a model based on a momentum theorem anda kinetic energy theorem and determining a critical speed of wire sliding under the condition that the detonating fuse is tightened; secondly, aiming at the built model, verifying and correcting a critical speed value by using experimental process data and determining a final critical speed of the wire sliding; thirdly, determining the relaxation speed of each stay wire according to historical experience data and predicting the tightening moment of the detonating fuse; fourthly, designing a switching control strategy and controlling the stay wires at the maximum wire staying speed higher than critical speed under the condition that the detonating fuse is loosened; controlling the stay wires at the speed lower than the critical speed under the condition that the detonating fuse is predicted to be bound to be tightened, thereby keeping working efficiency unchanged. According to the variable speed control technology disclosed by the invention, the condition that the working efficiency is reduced due to wire sliding in the factory production can be prevented; by mean of a strategy of controlling the switching speed of the stay wires, the problem of wire sliding is avoided and the working efficiency is kept unchanged.

The invention provides an intelligent life prolonging control method for reuse of a retired aero-engine, which comprises the following steps: establishing a thermal mechanical fatigue life model according to engine performance parameters and turbine guide vane material characteristic parameters; designing different acceleration limiting plans in the early acceleration stage, the middle acceleration stage and the later acceleration stage respectively; in order to prolong the service life and improve the dynamic performance, constructing an objective function by adopting an evaluation function method, and converting a multi-objective optimization problem into a single-objective optimization problem; and adding the thermal mechanical fatigue life model and the acceleration limit plan into a main controller, performing joint simulation with the engine complete machine model, obtaining each parameter value in the acceleration limit plan through continuous optimization iteration, and determining the final acceleration limit plan as a life extension control rule. According to the method, only the acceleration control rule of the retired aero-engine needs to be modified and optimized, hardware of an engine body and a controller does not need to be changed, the modification difficulty is small, the cost is low, and the effect is obvious.

A two-stage machine tool transmission, in particular a spindle drive transmission, includes a planetary gearset in which a spindle or a spindle insert can be connected to a drive output of a transmission, which has a first drive output shaft and the second drive output shaft, such that the first drive output shaft is connected in a rotationally fixed manner to a drive input shaft and can optionally be connected, via a first shift element, to a sun gear of the planetary gearset. The second drive output shaft is connected in a rotationally fixed manner to a carrier of the planetary gearset. A ring gear of the planetary gearset is connected in a rotationally fixed manner to the transmission housing and a second shift element is provided such that a connection between the spindle or a spindle insert and, optionally, the first or the second drive output shaft, is possible.

The invention provides a motor operation control method based on discrete current vector phase-amplitude coordination. The motor operation control method is characterized by meeting three different control requirements for phase-amplitude coordination control in the motor operation process, the first requirement is to take output torque maximization as a goal, the second requirement is to take torque pulse minimization as a goal and the third requirement is to take position deviation minimization as a goal. The phase angle and the amplitude of current vector are respectively subjected to coordinated control. The control method adopts the following devices: a phase-amplitude coordination control module, a current control module, a power circuit, a motor, a position detection module and a current detection module, wherein one end of the phase-amplitude coordination control module is connected with the current control module, and the other end of the phase-amplitude coordination control module is connected with the position detection module; the current control module is connected with the signal control terminal of the power circuit; the output terminal of the power circuit is connected with the motor through a wire which penetrates the current detection module; the current detection module is further connected with the current control module; the position detection module and the motor are coaxially mounted.

Internal combustion engine and method for controlling the operation of an internal combustion engine, wherein the method comprises: determining an operating load of the internal combustion engine, controlling the operation of the internal combustion engine on the basis of a standard control map which realizes a determined propulsion power of the internal combustion engine when the operating load of the internal combustion engine is constant and, when the operating load of the internal combustion engine increases to a predetermined extent, activating at least one control characteristic for modifying the standard control map so that the propulsion power of the internal combustion engine is increased.

The invention relates to a starting method of an engine and a hybrid power system. The engine starting method is used for the hybrid power system. The hybrid power system comprises an engine used forproviding power and a motor, and a cut-off clutch, a clutch device and a transmission. The cut-off clutch is disposed between the engine and the motor to selectively connect or disconnect power transmission of the engine. The clutch device is arranged between the motor and the transmission so as to selectively connect or disconnect power of the motor and/or power of the engine to the transmission.The starting method comprises the following steps that under the condition that preset conditions are met, the rotating speed of the motor is increased, and when the rotating speed of the motor is increased to a first correction rotating speed, the state of the clutch device is switched from a sliding abrasion state to an engaged state; and the state of the cut-off clutch is switched from the sliding abrasion state to the engaged state when the rotational speed of the engine reaches a second corrected rotational speed while the clutch device is in the engaged state.