85results about How to "Improve torque characteristics" patented technology

A multi-point lock for a closure includes two or more of a latch (19,20), lift bolt (13) and at least one drive element (16,17) for operating a shoot bolt or remote deadbolt. A drive cam (15), a drive gear (14) and a toothed member (42) coupled to at least one of said lift bolt (13) and at least one said drive element (16,17), said toothed member (42) being in meshed engagement with the drive gear (14), said drive cam (15) being drivingly coupled with the drive gear (14) via a lost motion coupling (38,40). Rotation of the drive cam (15) in one direction can thus actuate the latch (19,20) and in the opposite direction actuate the drive gear (14) to cause movement of the lift bolt (13) and drive element (16,17).

In a vehicle power supply system including a battery, an inverter unit for converting DC electric power of the battery into AC electric power and supplying it to a rotating electric machine to drive it, an AC wiring line for connecting the rotating electric machine and the inverter unit, and a DC wiring line for connecting the inverter unit and the battery, the inverter unit is placed in a vicinity of the battery so that the DC wiring line becomes shorter than the AC wiring line. By this, a voltage drop due to the DC wiring line is reduced, and a torque characteristic of the rotating electric machine can be improved.

The invention provides a high-altitude, low-speed and high-lift natural laminar flow airfoil. The maximum thickness of the airfoil is 14%C, the maximum thickness location is 36%C, the thickness of a trailing edge is 0.425%C, the maximum camber is 5.1%C, and the maximum camber location is 47%C, wherein C is the chord length of the airfoil. The airfoil firstly turns and then separates under the conditions of low speed and 1 million magnitude Reynolds numbers, laminar flow separation bubbles are not formed, and the natural laminar flow airfoil has a higher design lift coefficient and a larger lift-drag ratio, has mild stalling characteristics and good torque characteristics and can meet the performance demands of a high-altitude long-endurance unmanned aerial vehicle.

The invention relates to a variable-frequency speed regulating system for starting a high-power pumped storage unit in the technical field of water pumps, comprising a static frequency converter (SFC), an input circuit breaker, an output circuit breaker, a grid-connected switch, an excitation device, wherein a power grid is connected with the input circuit breaker sequentially connected with the static frequency converter, the output circuit breaker and the excitation device, the excitation device is connected with the grid-connected switch, and the other end of the grid-connected switch is connected to a circuit between the power grid and the input circuit breaker. The static frequency converter is a high-voltage frequency converter formed by connecting in series and stacking power units of an insulated gate bipolar transistor (IGBT). The static frequency converter of the variable-frequency speed regulating system has the characteristics of concise system structure, convenient maintenance, rapid response, accurate control, less harmonic content, reliable running, high efficiency and low reactive power impact.

The invention discloses a two-degree-of-freedom dual-winding hybrid magnetic bearing switched reluctance motor and a control method thereof, and belongs to the field of a magnetic suspension motor and control thereof. The motor comprises a 12 / 8-pole switched reluctance motor and a 12-pole magnetic bearing, wherein a suspension winding and a bias winding are wound around each of four stators of the magnetic bearing, all bias windings are connected and then are connected in series with an A-phase winding of the reluctance motor to form an A-phase composite excitation winding, a constant conduction excitation mode is employed, bias magnetic flux is generated in the magnetic bearing, and meanwhile, a torque is generated in the reluctance motor; a B phase and a C phase employ modes of excitation in turns, and the A phase employs asymmetric excitation in a positive and negative half period to generate an effective torque; and the A phase provides the bias magnetic flux by control and also generates an average torque equal to those of the other two phases, and the average output torques output from the three phases are symmetric. By the motor and the control method, the magnetic bearing and the reluctance motor are isolated, no coupling is generated between magnetic paths, the torques and the suspension forces are decoupled, and a power system is low in cost and is simple to control.

There is provided a screw treated by a chemical conversion coating of trivalent chromium having a torque characteristic approximately equivalent to a screw of a hexavalent chromate treatment. For the purpose, on a surface of a bolt, a zinc plating layer is formed by a zinc plating treatment. On the layer, a chemical conversion coating of trivalent chromium is also formed by a treatment of chemical conversion coatings of trivalent chromium. The coating is formed to be thin and soft so that the zinc-based plating layer can be exposed on the surface due to rubbing off of the chemical conversion coating of trivalent chromium at a contact portion to a fastened member of the bolt by tightening the bolt.

Disclosed is an active boost power converter for driving a single-phase SRM, capable of rapidly establishing excitation current in the excitation mode and reducing tail current and negative torque in the demagnetization mode under the high-speed operation of the SRM. The active boost power converter includes a boost module and a converter module connected to the boost module. The boost module includes first and second capacitors, first and second diodes and a switch device turned on / off to connect the first and second capacitors to each other in series or parallel. The switch device includes an insulated gate bipolar transistor (IGBT). The power converter is operated with first and second input modes and first and second output modes. Voltage of the first capacitor is equal to dc-link voltage and first and second capacitors are controlled to be operated in series or parallel by simply controlling the IGBT.

An integrated universal wheel comprises a universal wheel body, a transmission and a brushless EU disc type motor. The brushless EU disc type motor and the transmission of the universal wheel are placed in the universal wheel body. The brushless EU disc type motor is connected with the transmission. A gear at the output end of the transmission serves as a sun gear to be engaged with a planet gear in the universal wheel body to drive the universal wheel body to move. By the adoption of the integrated universal wheel, the brushless EU disc type motor is fixed into the universal wheel body, and the working efficiency of the brushless EU disc type motor is improved.

An object of the invention is to provide a transverse flux machine apparatus (TFMA) with simple and economical core structure. The TFMA employs a core having laminated iron plates. The core has left diagonal portions and right diagonal portions for forming the 3D flux passages. A plurality of the 3D structures employs laminated iron cores with diagonal portions. By means of employing the diagonal portions, the core looks like a centipede. The centipede-like TFM called CTFM can have a plurality of types. A plurality of motor structure and a plurality of driving means are proposed for the CTFM.

This invention refers to a more three-phase ACS motor adopting inverter to supply power to rotor, which contains said rotor is three-phase and connected with electric network and has plurality of group of three-phase symmetry windings independent in circuit, there is only magnetic circuit coupling among groups without direction relation in electric circuit, the each star connected three-phase windings has independent zero point, the angle connected windings is independent, the total windings phases are multiple times of three, e.g. 2X3, 3X3,...NX3, (N is positive integer greater than 1), the phase difference between adjacent phase in dependent three-phase is 120 degree, the displacement angle can adopt 360 degree / (nX3), 180 degree / (nX3), or 0<=beta<180 degree / (nX3), the inverter is a special structure combination of multiple phase inverter, the corresponding phase difference in adjacent three-phase windings is Pi / (nX3).

The invention discloses a disc type iron-core-free permanent magnet synchronous motor controller for an electric automobile hub. The disc type iron-core-free permanent magnet synchronous motor controller comprises a control circuit, wherein the signal output end of the control circuit is connected with a voltage type inverter circuit, the power supply input end of the voltage type inverter circuit is connected with the output end of a direct current power supply, the output end of the direct current power supply is also connected with a capacitor C in parallel, an inductor is serially connected between the three-phase output end of the voltage type inverter circuit and each three-phase input terminal of a motor, the signal input end of the control circuit is connected with the power supply input end of the motor through a current sensor, and the signal input end of the control circuit is also connected with an output shaft of the motor through a rotary transformer. The disc type iron-core-free permanent magnet synchronous motor controller has the characteristics of light weight, small volume and flat structure, is capable of outputting a large peak torque in short time to ensure that the output torque of a disc type iron-core-free motor is kept constant, and is good in torque characteristic.

The invention relates to a rotor (3) of a dynamo-electric machine (1) which is rotatable about an axis (5), wherein the rotor (3) consists of at least three axial successively arranged immediately adjacent sections I to III composed, wherein the rotor ( 3) is formed by at least two different rotor part package types (9,10).

A length variable intake manifold comprises an intake manifold main body, the resonant cavity and a flange; the left side section of the intake manifold main body and one side of the resonant cavity form into a whole which cannot move; the right side section of the intake manifold main body and the flange form into a whole which cannot be separated; the middle section of the intake manifold main body can slide in a reciprocating mode to achieve the length change of the intake manifold; the intake manifold main body is provided with an air channel length variable mechanism which comprises a solenoid valve, a vacuum hose, an actuator, a valve plate, a bearing and a rotating shaft; the solenoid valve can receive signals sent from an engine control unit when an engine reaches the set rotational speed, the signals are output to the actuator, the rotating shaft is driven by the actuator to rotate, and accordingly the valve plate swings to drive the middle section to move and the length change of the intake manifold is performed. According to the length variable intake manifold, the torque characteristics of the engine are improved and accordingly the vehicle power performance is improved and the oil consumption and emission is effectively improved.

The invention relates to an integrated gate commutated thyristor based high-power pumped storage unit starting system, and relates to the technical field of pumped storage units. The technical problems that the system structure is simplified, the harmonic content and reactive impact are reduced, and the efficiency is improved are solved. The system comprises a power grid, a synchronous motor, a static frequency conversion device, an excitation device and an on-grid switch, wherein the static frequency converter device comprises a filter, a step-up transformer, three frequency-converison-side thyristor power units and three step-down transformers, and the excitation device comprises an excitation-side transformer and an excitation-side thyristor power unit; and the armature winding of the synchronous motor is connected with the power grid through the on-grid switch, and is sequentially connected to the power grid through the static frequency converter device, a grid-side vacuum switch and a power-grid side mutual inductor, and the excitation winding of the synchronous motor is sequentially connected to the power grid through the excitation device, an excitation-side vacuum switch and an excitation-side mutual inductor. The system provided by the invention has good a torque characteristic, and can improve the on-grid success rate of the unit.

The invention discloses a synchronous electric main shaft acceleration strong magnetic control method for variable-load superhigh-speed grinding, and the method comprises the steps: obtaining a d-axis current expected instruction value and a q-axis current expected instruction value of a synchronous electric main shaft in a closed-loop manner, and obtaining voltage expected instruction values at all phases in a three-phase stationary coordinate system; enabling error signals between the voltage expected instruction values at all phases in the three-phase stationary coordinate system and the action value of voltages at all phases to serve as the control signals of power switch IGBTs at all phases, carrying out the vector control of the actual output currents of a PWM Inverter driver at all phases; continuously increasing the q-axis current expected instruction value, and reducing the d-axis current expected instruction value; and enabling the internal power factor angle beta of the motor to be reduced continuously. The method is good in motor torque characteristics, is high in grinding efficiency, is high in dynamic response of motor torque speed, is good in robustness, is high in grinding quality and precision, is small in motor current, can effectively prevent a controller from being saturate, prevents a motor from stalling and being out of control, is high in efficiency, and saves energy.

The invention belongs to the technical field of unmanned aerial vehicle aerofoil profile design and specifically relates to a high lift-drag ratio laminar flow aerofoil profile suitable for a low altitude (H is less than 5000 m) and low speed (Ma is less than 0.1) unmanned aerial vehicle. The maximum thickness of the aerofoil profile is 10%C, the chord position corresponding to the maximum thickness is 34%C, the maximum camber is 3.76%C, the chord position corresponding to the maximum camber is 41%C, and the thickness of a trailing edge is 0.3% C, wherein C is the chord length of the aerofoilprofile. According to the high lift-drag ratio laminar flow aerofoil profile suitable for the low altitude and low speed unmanned aerial vehicle, the upper surface of the aerofoil profile can generateflow transition at the 70-80% chord length under a working condition of 500 thousand order of Reynolds number; laminar flow gradually evolves into turbulent flow, namely, is transitioned first and then is separated; laminar flow separating bubbles are not generated; in a design state, the aerofoil profile has low resistance and high lift-drag ratio and possesses stable stalling characteristic andexcellent torque characteristic; and each performance index of the light unmanned aerial vehicle during low altitude and low speed long flight can be satisfied.

M double-salient-pole single-phase brushless direct current motors possessing 2n stator poles and a rotor magnetic pole or disc-type motors are installed on a same shaft. Stators and rotors of all the sub-motors form one integral stator and an integral rotor. If starting dead points of at least one or more sub-motors are not overlapped, each sub-motor operates independently so that a m-phase brushless direct current motor without dead point is formed. If each sub-motor successively rotates 360 / 2mn degree respectively, a stepping motor is formed. There are operation modes of 2m and 4m steps, and continuous stepping operation. A stepping angle is a 360 / 2mn degree or a 360 / 4mn degree. The m equals to 2. One angle sensor and one motor brake are added so that the stepping servo motor is formed. A continuous stepping operation mode is used to start the operation till that the motor is operated at a position which makes an assigned step pitch difference is less than one step, and then current sizes and directions of two phases are adjusted so that the rotor is rotated to an assigned position, and power off is performed after braking so that a function of the servo motor is realized.

The invention provides a regular L-shaped sliding plate applying linear motor driving, and the regular L-shaped sliding plate provided by the invention is used for supporting a cross beam. The regular L-shaped sliding plate is characterized in that a stand column of a sliding plate (1) forms a regular L shape with a bottom angle in front of the stand column; a bevel reinforcing structure is arranged at the corner of L; slide blocks (4) are respectively arranged on the front vertical face of the L-shaped sliding plate and the upper plane of the bottom edge of a right angle, and is combined with a guide rail (5) arranged on the cross beam (6) in a hanging arrangement mode; hydraulic brakes (3) are arranged in the middle parts of the sliding blocks (4) in parallel; a primary stage (2) of a linear motor is obliquely arranged on the corner slope structure of the sliding plate (1), and a secondary stage (7) of the linear motor is arranged on a lower slope of the cross beam; and the guide rail (5) is fixed on the front vertical face of the cross beam (6) and the bottom edge of an inner slope at the bottom of the same side of the front vertical face. The L-shaped sliding plate has the advantages that the linear motor is easily assembled, the electromagnetic force is eliminated, friction on the guide rail when the sliding plate moves in the Y direction is reduced, the rigidity of the sliding plate is greatly improved, and the like. By utilizing the L-shaped sliding plate, the Y-direction acceleration performance of a machine tool is improved, the drive loading of the machine tool is lightened, and the service lives of the guide rail and the linear motor are prolonged.

The invention discloses a rotor structure of an asymmetric few-rare-earth-mixed permanent magnet motor. According to the rotor structure, a plurality of rectangular grooves are formed in a rotor in the vertical circumferential direction and are divided into an upper layer and a lower layer; magnetic tapes are formed between the upper layer and the lower layer; rectangular ferrite is embedded in each rectangular groove; symmetrical ox-horn-shaped grooves are formed in the left sides and the right sides of the bottom parts of the upper rectangular grooves and the upper parts of the lower rectangular grooves; convex grooves are formed in the positions, close to a rotating shaft, of the lower layer of the rectangular grooves; rectangular magnetic isolation grooves perpendicular to the axis direction of the rotor are formed in the bottoms of the rectangular grooves; rectangular magnetic isolation grooves and T-shaped magnetic isolation grooves are formed at the joints between the upper layer of the rectangular grooves and air gaps at intervals; V-shaped grooves are symmetrically formed in the left sides and the right sides of the T-shaped magnetic isolation grooves; linear grooves communicated with the rectangular grooves are formed in the left sides of the rectangular grooves; and neodymium-iron-boron permanent magnets are embedded in the sides, close to the ferrite, of the V-shaped grooves and the linear grooves. According to the rotor structure, the material cost of the permanent magnet motor is lowered, the torque characteristics are improved, the iron core and eddy currentloss are reduced, and the efficiency of the motor is improved.

This invention refers to more three-phase ac squirrel-cage asynchronous motor power supplied by inverter, which contains plurality of groups of three-phase symmetry windings independent in circuit, there is only magnetic circuit coupling among groups without direction relation in electric circuit, the each star connected three-phase windings has independent zero point, the angle connected windings is independent, the total windings phases are multiple times of three, e.g. 2X3, 3X3...NX3 (n is the positive integer greater than 2).

The invention relates to a supercharger with exhaust gas recirculation. An engine, methods and systems are provided for supercharging charge air for internal combustion engines. The engine having an intake, and a blower with at least one impeller in the intake mounted on a rotatable shaft. An EGR line opens into the intake system upstream of the at least one impeller to form a junction point. A flap, pivotable about an axis running transversely with respect to the intake air flow, has: a first position which blocks the intake by way of a front side, and which opens up the EGR line; and a second position to cover the EGR line and open intake system wherein the flap is not planar, and has, at least on the front side thereof, at least one deformation as an unevenness.

The invention discloses a flat stepping motor. In a motor, N same magnetic steels are uniformly fixed and embedded on a disc-shaped turntable. The magnetic fields of the magnetic steels are in the same direction. An output shaft is fixed at the center of the turntable, and n same electromagnetic seats are uniformly fixed in a front end cover shell. An electromagnetic coil is fixed on the outer edge of the electromagnetic seat, and m magnetic salient poles identical to the magnetic steels are fixed in each electromagnetic seat. The angle of the center line of m magnetic salient poles in adjacent electromagnetic seats deviating from the center line of the electromagnetic seats is 360 degrees / nN. The rear end cover is the same as the front end cover. The output shaft is rotatably mounted on the front and rear end covers. The magnetic salient poles of the two end covers are opposite in a one-to-one manner, and a rotor is clamped between the two. The opposite electromagnetic coils of the front and rear end covers are connected in parallel or series and then connected with an output pole of the controller. The electromagnetic field of the coil and the magnetic field of the magnetic steel are in the same direction. The controller outputs pulses to the coils sequentially, and the rotor is pulled by the electromagnetic force to rotate. Since the ratio of the axial length to the diameter can reach 1:3, the flat stepping motor disclosed by the invention is convenient to mount; and moreover, the flat stepping motor has the advantages of good torque property, small rotational inertia and stable operation, and is convenient to control.

The invention relates to a high-pressure common rail type diesel engine and a design method thereof. The design method comprises following steps: the circular absorbing heat is calculated; the circular heat releasing amount is calculated; the circular heat efficiency is calculated; the circular average pressure is calculated; the air pressure of the Szabad circular middle point 5 is calculated, and according to the calculated circular absorbing heat, circular heat releasing amount, circular heat efficiency, circular average pressure and air pressure of the Szabad circular middle point 5, the high-pressure common rail type diesel engine is designed. The high-pressure common rail type diesel engine comprises an oil supply pump assembly, an oil spraying device assembly, a common rail assembly and an electric control unit; the electric control unit controls the oil supply pump assembly, the oil spraying device assembly and the common rail assembly to move, the oil supply pump assembly compresses the fuel oil to the needed pressure, fuel oil is conveyed to the common rail assembly for waiting to be distributed to the corresponding oil spraying device assembly, and the high-pressure common rail type diesel engine designed through the method is more precise and practical.

This invention relates to program controlled brushless direct current motor, which comprises outer rotor, inner stator and motor running circuit and is characterized by the following: the outer rotor shell inner column surface is evenly distributed with NS rotor permanent magnetism and the outer rotor end cover inside wall middle is evenly distributed with triggering permanent magnetism; the inner stator is located with stator electromagnetic coil set with one triangle load electromagnetic coil with each three sets of coils; the inner stator end is located with round Hall sensor fixing board with six Hall sensor; the six Hall sensors output ends are connected to the input ends of the motor running circuit and the triangle load electromagnetic coil each connection end is separately connected to the motor running circuit switch element output ends.

The invention discloses an intelligent automatic speed change system based on a manual speed change box and a working method thereof. The system comprises a manual speed change box body and an intelligent control device. The intelligent control device is composed of an electromechanical execution part and an intelligent control module part. The electromechanical execution part comprises a speed change execution device, a clutch execution device and a gear shifting execution device. According to the system, by means of combination of all mechanisms, the rapid automatic gear shifting process andthe better gear shifting corresponding characteristic of a car are achieved, thus an engine and the speed change box are at the optimal operation state, good fuel efficiency is obtained, abnormal wear and damage caused by manual operation are avoided, and operation and use efficiency of vehicles are improved.

A speed change apparatus includes a transmission, a change mechanism configured to move a gear or gears so as to change gear position, a force accumulation mechanism which includes a shift spindle and a force accumulation spring. The shift spindle is provided, in a rotatable manner, with a master arm configured to operate the change mechanism. A return spring is configured to bias the master arm toward a neutral position. A sub return spring, separate from the return spring and which directly biases the shift spindle toward the neutral position, is provided between the shift spindle and a case member.