93results about How to "Commutation is accurate" 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 discloses a carbon-free self-propelled trolley with a reversing function. A four-connecting-rod mechanism and a joint bearing part are used to accurately control swing of a guide wheel fork so as to realize turning of a guide wheel, small torque and abrasion and accurate swing are achieved. Four rail rods are used to limit swing of a counter weight, so that tilting of the trolley during turning and coming up and down a slope can be avoided effectively. The carbon-free self-propelled trolley is driven to move by converting gravitational potential energy into kinetic energy, no fuel or electric energy is needed, no greenhouse effect gases such as carbon dioxide are emitted, and the carbon-free self-propelled trolley is low-carbon, environmental friendly, and simple to use. An operator can reverse a trolley drive wheel to hang a heavy object, namely converting mechanical energy into gravitational potential energy. The carbon-free self-propelled trolley can be used as physics demonstration experiment equipment for primary schools and middle schools, and students are allowed to better understand experiment energy conversion and application through specific instances.

The invention provides a position sensorless control system commutation control method for a brushless direct-current motor. The brushless direct-current motor is connected with a three-phase fully-controlled bridge inverter circuit, the three-phase fully-controlled bridge inverter circuit is used for driving the position sensorless control brushless direct-current motor to work, the phase voltage of the brushless direct-current motor is acquired by virtually constructing neutral point of the motor again, the phase voltage of the brushless direct-current motor is collected through a position detection module, the phase voltage is filtered to obtain a zero crossing point, the rotor position information of the brushless direct-current motor is acquired, the angular difference of the current rotor commutation position and the optimal commutation position is calculated by using a position compensating module, and angle compensation is carried out in the next period. According to the method, the phenomenon that upwarp does not appear on current waveform before and after each conduction period is pushed, so that minimum torque ripple is realized. According to the control system realized by using simulation means, after errors are detected by the system, corresponding compensation is carried out in subsequent commutation period, and the result indicates feasibility and effectiveness of the method.

The invention relates to a phase changing method of a three-phase salient pole brushless direct current motor, the phase changing method firstly imposes direct current on a two-phase winding in a motor stator, thereby leading the winding of the stator to generate a positioning magnetic potential and dragging a rotor to enter a certain predicted initial position. The two-phase winding which is corresponding to the magnetic potential that is ahead of the initial position of the rotor by an electrical angle of 120 degrees is conducted along the target rotation direction, when current flow achieves the initial value of the current flow of the current two-phase winding, the two-phase winding which is corresponding to the magnetic potential that is ahead of the current position of the rotor by the electrical angle of 120 degrees is conducted, and the two-phase winding which is corresponding to the magnetic potential that is ahead of the position of the rotor at the phase changing point by the electrical angle of 120 degrees is gradually conducted according to the phase changing method, thereby pushing the rotor to rotate to the target direction. The invention discloses a realization device according to the method. The phase changing method can accurately detect the phase changing point of the position of the rotor, thereby having the advantages of strong portability, simple realization and reliable performance, etc.

An energy-storage lifting intelligent hydraulic pumping unit is formed by a hydraulic power device and a transmitter, which uses a step motor to control a three-way ball valve as unique hydraulic element used in steering control of the pumping unit, while one opening is connected with the outlet of the hydraulic pump, one opening is connected with a bottom inlet of a piston cylinder, and another opening is connected with a hydraulic oil pot, the inlet of the hydraulic pump is connected with an outlet of the hydraulic oil pot, the air pot contains a sliding sealing plug or the air pot contains an air bubble insulated from the hydraulic oil, the upper end of the piston rod is disposed with a block base arranged with one or three blocks fixed on the block base via a support, the hydraulic room is fixed with a block to form a strike-variable block group, one end of hair line is connected with a well smooth rod via a suspender and a square clamper while another end via the strike-variable block group is fixed on the hydraulic room. The invention has reliable operation and energy saving.

The present invention relates to a brushless direct current motor position detection method, a control device and an electric tool. The brushless direct current motor configured to control a sensorless to have three phases (A, B, C). The method comprises the following steps of: applying a first direction pulse at first time and a second direction pulse at second time in order for the A phase of the brushless direct current motor to obtain a bus current value Ia when the first direction pulse is applied to the A phase; repeating the operations mentioned above for the B phase and the C phase toobtain a bus current value Ib when the first direction pulse is applied to the B phase and a bus current value Ic when the first direction pulse is applied to the C phase; and comparing the sizes of the Ia, the Ib and the Ic to obtain an initial position of a rotor. The brushless direct current motor position detection method, the control device and the electric tool employ a pulse method to detect the position of the rotor at a position of rest, and commutation can be performed according to the position of the rotor to improve the accuracy of the commutation so as to improve the successfullystarting probability.

The invention discloses an electro-osmotic drainage consolidation method for electrode pipes. The electro-osmotic drainage consolidation method includes steps of arranging electrodes; arranging pipelines; electrifying the electrodes; stopping electro-osmosis. The step of electrifying the electrodes includes alternately electrifying the electrodes in a direction change manner; continuously electrifying the electrodes; intermittently electrifying the electrodes; repeatedly continuously electrifying the electrodes and intermittently electrifying the electrodes. The electro-osmotic drainage consolidation method has the advantages that a process for connecting currents, voltages and TDR (time domain reflectometry) sensors with one another is adopted, the intensity and the directions of electric fields are timely adjusted according to electric field and soil moisture content space-time distribution conditions fed by circuits, accordingly, electro-osmotic drainage consolidation speeds and effects can be guaranteed, the direction change and intermittent time can be accurately judged as compared with the traditional method for judging the direction change and intermittent time according to experience, and the electro-osmotic drainage consolidation method is high in pertinence for complicated lands.

The invention provides a long-stroke mechanical reversing speed reducer capable of being used for an oilfield oil pumping unit. Under the condition that a motor rotates in a specific direction, an output shaft can achieve forward and reverse rotation according to a certain rule through the reversing speed reducer, and therefore an oil pumping rod can reciprocate up and down linearly. According to the reversing speed reducer, two intermediate shafts (including one forward rotating intermediate shaft and one reverse rotating intermediate shaft) are mainly utilized, through cooperation and alternate combination and separation of two clutches, power passes through the two intermediate shafts in turn to be transmitted to the output shaft from an input shaft, and therefore the forward and reserve rotation reserving function can be achieved. In the power transmitting process, through combination of size changes of gears, the purposes of reducing speed and increasing torque are achieved. An encoder for metering angular displacement is arranged on the reserving speed reducer, and the encoder can be utilized for accurately metering the rotating angle of the output shaft so that accurate reversing can be achieved. Besides, by means of the function of the encoder, the clutches can be combined when the rotation speed difference of half shafts is closest, and therefore impacting and abrasion generated when the clutches are combined can be reduced.

The invention relates to a rack-and-segment type reciprocating pump limited by a cam, which is mainly composed of a frame, an input shaft, a fan, a rack assembly, a cam, a limit frame, a guide rail, a piston and a liquid cylinder. Among them, the input shaft is installed on the frame through the bearing, the gear fan is installed on the input shaft, the gear fan meshes with the rack assembly, one end of the rack assembly is connected with the piston rod, and the other end is connected with the limit frame, and the cam is placed in the limit position. in the box. The gear teeth of the gear sector are composed of cylindrical gears and elliptical gears with variable transmission ratios, and the corresponding circumferential angle of the part with gear teeth is less than 180°; near the far angle of repose of the cam, there is a contour line matched with the limit frame . When the mechanism is working, the piston is driven to reciprocate through the alternate meshing between the gear fan and the upper and lower racks, and the smooth and stable reversing of the mechanism is ensured through the cooperation of the cam and the limit frame. The invention has the advantages of simple structure, precise and stable commutation, high system efficiency, and small fluctuation of pump pressure and pump displacement.

An electromagnetic actuator comprises a core (1), a ferromagnetic component (2) movable in a gap (5) in the core, and a magnet (4) for attracting the component to one side of the gap. A flux concentrator (12) concentrates the magnetic flux on that side of the gap (5) and a solenoid (8) produces magnetic flux in the gap. A magnetic circuit of the solenoid is defined by part of the core (1), part of the gap (5) and by a further gap (6) between the ferromagnetic component (2) and the core (1). A demagnetiser (7) has a magnetic circuit defined by another part of the core (1), another part of the gap (5) and by the further gap (6). The demagnetiser is arranged to demagnetise the magnet (4) at least to the extent that the magnetic flux produced by the solenoid (8) is diverted from the flux concentrator (12) into the further gap (6) and the movable component (2) is movable away from the magnet (4) under the magnetic force of the solenoid (8).

The invention discloses an integrated type ultrahigh-pressure booster pump which comprises a proportional electromagnetic valve, a valve plate and a proximity switch. The proximity switch can generate induction with end faces of piston rods and feed back the induction to the proportional electromagnetic valve; the valve plate is connected at the top of a cylinder barrel of an oil cylinder; the proportional electromagnetic valve is connected at the top of the valve plate; high-pressure oil cavities communicated with an oil inlet of the valve plate are formed in a left end cover and a right end cover; the oil inlet of the valve plate is communicated with an oil inlet of the proportional electromagnetic valve; two work oil cavities of the proportional electromagnetic valve are respectively communicated with low-pressure oil cavities on the two sides of a piston in a cylinder barrel of the oil cylinder; the free ends of the two piston rods are respectively in slide fit in the high-pressure oil cavity of the left end cover and the high-pressure oil cavity of the right end cover; oil outlets communicated with the two high-pressure oil cavities are formed in the cylinder barrel of the oil cylinder. By means of the structure, the pump size is smaller, the booster pump is suitable for various occasions, and the work efficiency is higher.

The invention discloses a two-wheel self-balancing driving system based on an embedded ARM. The two-wheel self-balancing driving system based on the embedded ARM comprises a left wheel, a right wheel, pedals, a motor driving system and a steering device, wherein the left wheel and the right wheel are connected through an axle, the steering device is connected with the pedals, the left wheel and the right wheel are respectively provided with a brushless direct current motor, the motor driving system is arranged above the axle and below the pedals, an embedded driving control system and two driving modules are arranged in the motor driving device, and the two driving modules are connected with the brushless direct current motor of the left wheel and the brushless direct current motor of the right wheel respectively. The embedded driving control system comprises a microcontroller stm32 single chip microcomputer, a power source, a gyroscope, an accelerometer, a current measuring device and a functional module, wherein the power source is connected with the stm32 single chip microcomputer, the gyroscope, the accelerometer and the brushless direct current motors, the gyroscope is connected with the accelerometer, the accelerometer is connected with the stm32 single chip microcomputer, and the stm32 single chip microcomputer is connected with the two driving modules. The two-wheel self-balancing driving system based on the embedded ARM has the advantages of being high in systematic cost-performance ratio, wide in application range, and capable of having large promotional value.

The invention discloses a compensation method for high-speed position detection error in a three-phase electric excitation double salient pole motor, which detects the difference between the flux linkages of any two phases of the motor, and then subtracts the flux linkage component produced by the armature winding in the difference of these flux linkages , to eliminate the influence of the armature reaction on the zero-crossing position where the flux linkage difference changes from positive to negative. Compared with the prior art, the invention reduces the position observation error caused by the armature reaction, and realizes the accurate commutation and stable operation of the electric excitation double salient pole motor without a position sensor.

The invention provides a three-phase position signal detection method for a switched reluctance motor. In a high-speed APC mode, an A phase hall position signal HA is detected by an input capture channel of a universal timer TIM1 to obtain a time interval of a cycle of the position signal; with a capture value as reference time, switching time of three phase switch tubes is calculated according to three-phase switching angle values set in the APC mode; a timer TIM2 starts timing entrance interrupt according to the switching time of each phase; and meanwhile on and off of each phase switch tube of a power converter are controlled and driven by combining a calibration method of capturing a falling edge of the A phase by a timer TIM3, so that operation of the switched reluctance motor is achieved. The method can avoid a hall position signal deviation caused by N, S pole processing errors of other magnet rings, electromagnetic interference and the like, so that the accurate detection result on the three phase hall position signals of the switched reluctance motor is achieved.

A two-driven-by-one overturning and conveying device for a mask blank making machine is characterized in that the conveying device comprises a feeding conveying mechanism connected with the mask blankmaking machine and a double-channel conveying mechanism connected with mask ear ribbon welding machines; and an overturning and conveying mechanism is arranged between the feeding conveying mechanismand the double-channel conveying mechanism. According to the two-driven-by-one overturning and conveying device for the mask blank making machine, the mask blank making machine and the two mask ear ribbon welding machines can be organically combined through the feeding conveying mechanism, the overturning and conveying device and the double-channel conveying mechanism, and finally mask blanks arestably conveyed to the mask ear ribbon welding machines at a constant speed; and conveying belts are arranged on the feeding conveying mechanism in a 3D manner, precise reversing and conformal positioning of the mask blanks produced by the blank making machine are guaranteed, finally the machining efficiency of mask ribbon welding is improved, and the machining cost is saved.

The invention discloses a commutation point position correction method of a sensorless brushless direct current motor based on a terminal voltage method. The correction method is used for solving thetechnical problem of poor practicability of the existing commutation point position correction method of the sensorless brushless direct current motor. According to the technical scheme, by detectingthe terminal voltage in real time, waveform symmetry of the terminal voltage is kept, correction of a commutation point of the motor is achieved, accurate commutation of the motor is guaranteed, the operation performance of the motor is improved, and advance or lag commutation and out-of-step faults of the motor are prevented. According to the invention, no extra circuit is needed, and the hardware cost of the system is not increased. Complex mathematical and logical calculation does not need to be carried out in software, and the requirement for the calculation speed of the microprocessor isnot too high. Therefore, implementation is easy, and engineering application is facilitated. The method is not only suitable for a high-voltage high-power brushless direct current motor control system, but also suitable for other brushless direct current motor control systems, and is good in practicability.

The invention discloses a control method, device and system for a dust collector and a brushless direct current motor, and the method comprises that: in a rotor pre-positioning stage, the pre-positioning of a rotor of the motor is performed through employing a static pulse positioning method so as to obtain the position of the rotor of the motor; in a low-speed operation stage, a dynamic pulse detection method or a flux linkage function method is adopted to obtain a commutation point of the motor, and the motor is controlled to perform commutation according to the commutation point; and in themedium-high speed operation stage, the counter potential zero-crossing point of the motor is detected in a mode of combining the counter potential zero-crossing detection time interval and the counter potential zero-crossing detection method, and the motor is controlled to perform phase commutation according to the counter potential zero-crossing point. Therefore, the starting and positioning time of the motor can be greatly reduced, the motor is ensured not to rotate reversely during starting, abnormal sound and jitter during positioning are solved, accurate commutation of the motor in a low-speed operation stage can be realized, the reliability is high, a counter electromotive force zero-crossing point can be timely and accurately detected, and the motor is ensured to stably operate atan extremely high rotating speed.

The present invention discloses a control method for drivers' license self-service issuing machine. The machine mainly has following steps: firstly conveying paper from a paper feeding module to a rotating module, then feeding to a first printer through a reversing module for first printing, and then returning to the rotating module from the first printer for a 180 degree flip, again conveying tothe first printer for printing, after the printing is completed, conveying into the rotation module for a 180 degree reverse flip, then sending to a second printer through the reversing module, afterthe second printer finishes printing the paper, sending the paper to a cutting module, cutting the paper through the cutting module into primary page and secondary page, then loading the primary pageinto a plastic sealing bag through a film taking module, sending to a plastic sealing module for heating and plastic sealing then discharging, and discharging the secondary page directly through the plastic sealing module. And at the same time, the method realizes self-issuing of a leather case through a dispensing module. The method can realize automatic issuance of a driver's license and recycling of an old licence, thereby greatly facilitating a driver to obtain the driver's license, reducing window pressure, and conforming to convenience measures currently implemented by the government.

The invention discloses a commutation control method of an electric steering engine driving device. The method is used for two-two conduction commutation of a three-phase brushless direct current motor. The method comprises the following steps of using a three-phase Hall sensor installed on the brushless direct current motor to detect a rotor position signal of the three-phase brushless direct current motor; inputting a three-phase Hall simulation signal into a controller and converting into a Hall digital signal, then generating six kinds of codes and forming a six-step commutation sequence;and carrying out logic selection and determination in the controller, calculating and acquiring a three-phase UVW control signal code of a three-phase brushless direct current motor driver, through anIO port of the controller, simulating and outputting a control signal to the driver so as to carry out current commutation, and conducting two channels in three channels of UVW, wherein the two channels are power switches of an upper bridge arm and a lower bridge arm and are opened simultaneously, and other power switches are closed. The method possesses advantages that a control algorithm is simple; control driving integration is achieved; and a driving device is simple and so on. A rotor position and speed information can be accurately monitored.

The invention discloses a two-in-one automatic production machine for masks. The two-in-one automatic production machine comprises a mask slicing machine and mask ear belt welding machines. The two-in-one automatic production machine is characterized in that the mask production machine further comprises a conveying and transferring device; the discharging end of the mask slicing machine is in butt joint with the feeding end of the conveying and transferring device; and the discharging end of the conveying and transferring device is in butt joint with the two mask ear belt welding machines. According to the two-in-one automatic production machine for the masks, seamless connection in the mask machining process can be achieved, mask slices can be provided for the two mask ear belt welding machines through one mask slicing machine, the problems that a traditional mask slicing machine and mask ear belt welding machines are not consistent in production takt, low in efficiency and inaccurate in slice conveying are solved, a feeding conveying mechanism of the two-in-one automatic production machine is used for achieving mask slice automatic positioning, and the conveying and transferring device can be used for stably conveying the mask slices to the mask ear belt welding machines at a constant speed.

A pressurizing and water-injecting apparatus for oil field is composed of the pressurizing cylinder divided into 4 cavities A, B, C and D by piston and connecting rod, and the self-circulating hydraulic station which consists of oil valve group connected to said cavities A and D, water valve group connected to said cavities B and C, oil pump, oil tank, energy accumulator, filter, electromagnetic change valve, and cooler. They are connected with each other on the basis of the invented function.