203results about How to "Improve power-to-weight ratio" patented technology

A rotary electrical machine has at least one stator and a rotor. The stator includes at least one armature winding received in at least one pair of slots. The rotor includes flux switching arrangement, which is adapted for selectively establishing closed magnetic circuits which pass around the turns of the armature winding. The arrangement for switching the flux comprises at least one permanent magnet adapted to establish a magnetic flux which is looped on itself in one circumferential direction of the rotor, together with at least one excitation winding for establishing an adjustable magnetic flux locally in a circumferential direction opposite to the direction of the flux produced by the magnets.

The invention discloses a high-power-to-weight-ratio integrated electromechanical servo actuation device which comprises matched devices like an integrated servo motor, a planet ball screw pair, a rotary coder, a linear displacement sensor and a shell. A motor stator is fixed on a main shell, and the motor stator and a magnetic chip at the tail end of a screw form the integrated servo motor which drives the screw to rotate; a nut converts rotating motion of the screw into linear motion and pushes a load to output linear motion, the linear displacement sensor detects displacement in real time, the rotary coder is used for detecting rotating angle of the screw, and a guide rod can prevent the nut from rotating and plays a role in guiding; a guide ring is mounted in a front shell hole to play a role in guiding and supporting the nut, and the guide ring and a cylinder roller bearing at the rear end of the screw jointly guarantees coaxiality. The high-power-to-weight-ratio integrated electromechanical servo actuation device has the advantages of high power to weight ratio, small size, high transmission efficiency, high loading capacity and high reliability, and novel idea and technical guarantee are provided for development of electric push rods and multi-electrified / full-electrified aircrafts.

An internal combustion engine drivably connected to a variable displacement and variable internal compression ratio supercharger that supplies varying amounts of air to the engine air intake manifold that can range selectively from below through above atmospheric pressures responsive to the power requirements of the engine. The supercharger has a pair of rotors concurrently driven by the engine to move air to the engine. A slide assembly associated with screw rotors is movable with a controller relative to the rotors to bypass air to atmosphere and regulate the amount of air and pressure of the air above atmospheric pressure compressed by the screw rotors to the engine to increase the engine's efficiency. When operating at part-load unboosted, a throttle valve is operable to control the air mass flowing to the air intake manifold below atmospheric pressure to control the power of the engine.

The invention provides a cable-free air bag type robot system which comprises a monitoring computer, a singlechip microprocessor, a wireless communication receiving and sending device, a wireless energy emitting circuit and a cable-free air bag type robot, wherein the singlechip microprocessor is respectively connected with the monitoring computer, the wireless communication receiving and sending device and the wireless energy emitting circuit, and the cable-free air bag type robot is in communication connection with the wireless communication receiving and sending device and is in energy exchange with the wireless energy emitting circuit. The cable-free air bag type robot system has the advantages of small trauma, safety and reliability, high movement efficiency, and wide application range.

The invention provides a mid-engine incremental stroke electric vehicle. The electric vehicle comprises a vehicle body, a turbo shaft engine (1), a battery pack (2), a generator (3), a whole vehicle controller (4), a driving motor (5), a gas controller (6), a battery controller (7), a gas holder (8) and a gas inlet tank (12), and is characterized in that the vehicle body comprises a vehicle main body, wherein the bottom structure of the vehicle main body forms a vehicle frame; the turbo shaft engine (1) is distributed between a front axle and a rear axle and is close to the vehicle frame of the rear axle; the axis of the output shaft of the turbo shaft engine (1) is positioned on the symmetry planes of the vehicle body; the air inlet of the turbo shaft engine (1) faces towards the tail of the vehicle; the gas inlet tank (12) is communicated with the air inlet of the turbo shaft engine (1); the gas inlet tank (12) is communicated with a gas inlet grille on a vehicle covering piece. The electric vehicle has the characteristics of high energy conversion efficiency, good operating performance, long driving mileage and high vehicle body structural strength.

A four stroke diesel engine combined with a supercharger is operable to supply varying amounts of air to the engine responsive to the load on the engine. The supercharger has a pair of rotors driven by the engine operable to move air to the engine. Gates associated with the rotors control the amount of air and pressure of the air moved by the rotors to the diesel engine.

The invention discloses a lightweight four-degree-of-freedom leg mechanism of a four-foot bionic robot. The leg mechanism comprises a hip joint yawing assembly, a thigh yawing assembly and a shank yawing assembly, the hip joint yawing assembly comprises a hip joint swing cylinder and an electro-hydraulic actuator, one end of the electro-hydraulic actuator and one end of the thigh yawing assembly are hinged to the hip joint swing cylinder through connecting blocks respectively, the other end of the electro-hydraulic actuator is hinged to the side face of the thigh yawing assembly, and the otherend of the thigh yawing assembly is hinged to the shank yawing assembly. According to the four-degree-of-freedom leg mechanism of the four-foot bionic robot, through the integrated oil way design, light weight is achieved, the hip joint swing cylinder is driven and controlled by the hydraulic pump, the load resistance is high, the power-to-weight ratio is high, the electro-hydraulic actuator andthigh longitudinal swing general assembly is quick in action response, kinetic parameters are easy to accurately measure, and four-degree-of-freedom motion with three active degrees of freedom and onepassive degree of freedom can be achieved.

The invention discloses a pressure self-balance type electromechanical servo action device under the high-pressure environment. The pressure self-balance type electromechanical servo action device comprises a servo motor, a planet pin roller screw pair, a piston, a speed reducer, a sensor, a shell and other matched devices. The shell is internally fully filled with oil liquid, and the piston can freely move in a piston cylinder. An oil passing hole is reserved in a main shell, and it is guaranteed that oil liquid in the main shell and a front shell flows smoothly. The rotation movement of a screw is converted into the linear movement through a nut, and an output rod is pushed to output the linear movement. A linear displacement sensor is arranged on the main shell, and a magnetic ring is arranged on a guiding block and does the linear reciprocating movement along with a deep groove ball bearing. A high-low lip seal is adopted as a dynamic seal at the position of a copper sleeve, static seals are adopted at other shell connecting parts, and inner and outer liquid mixing is prevented. The pressure self-balance type electromechanical servo action device solves the problems that an existing electromechanical action device is weak in voltage endurance capability, low in efficiency and the like, the power to weight ratio, the voltage endurance capability and the load capability of the electromechanical action device are improved, and a technology guarantee is provided for promoting the development of submarines and underwater devices under the high-pressure environment.

The invention discloses a highly-integrated pressure balance type deep sea electro-hydraulic servo mechanism and belongs to the technical field of deep sea electro-hydraulic servo. A spherical hinge rod end is arranged on an extending end piston rod through a spherical hinge rod end thread connection hole, a cylinder barrel combination piece and a valve block and pressure balance device combination piece are connected together through a screw, the valve block and pressure balance device combination piece and a balance piston placement barrel are connected together through a screw, a balance piston is put into the balance piston placement barrel, sea water and high-pressure oil are arranged at the front end and the rear end, the high-pressure oil enters the balance piston placement barrel through a high-pressure oil hole and is used for balancing the pressure of the whole system, four baffles are evenly arranged at the rear end of the balance piston placement barrel, and an emergency pipe connector is arranged on a piston rod pressure balance barrel and a cylinder bottom cover. The highly-integrated pressure balance type deep sea electro-hydraulic servo mechanism has the beneficial effects that pressure balance and a highly-integrated structure are adopted to the design and layout, meanwhile, the dual-redundancy design thought is adopted, reliability and safety are greatly improved, and the service life is greatly prolonged.

A novel electric motor rotor structure, particularly desirable for use with brittle rare-earth-magnets, offers improved resistance to rattling and axial shifting. This is achieved by forming the rotor with an annular central yoke connecting to a plurality of pole shoes along the periphery of the rotor and defining a magnet-receiving recess or pocket 160 between each pole shoe and the central yoke. Spaced circumferentially between adjacent magnets 38 are regions 146 of reduced magnetic conductivity, which include relatively thin metallic holding segments, which connect adjacent pole shoes to each other and to the central yoke. During manufacturing, tools are applied to upset or crimp the holding segments, and thereby form spring elements, to hold the magnets in stable positions and resist any tendency of the magnets to rattle or axially shift during motor operation. One obtains the same power level from a smaller, and therefore lighter, motor than was previously possible.

The invention relates to a hydraulic-electric hybrid-driven walking robot. Electro-hydraulic mechanical cylinders or hydraulic mechanical cylinders are adopted to replace traditional piston cylinders,and a hydraulic-electric hybrid-driven mode is adopted for driving. High pressure oil is provided by a constant pressure variable pump, and the high pressure oil flows into the electro-hydraulic mechanical cylinders or hydraulic mechanical cylinders to drive all joints to rotate. Each electro-hydraulic mechanical cylinder and each hydraulic mechanical cylinder are both provided with a variable pump / motor, and the motion state of each leg is controlled by adjusting the swash plate angle of the variable pump / motors. According to the hydraulic-electric hybrid-driven walking robot, the problem ofdeficiency of large energy loss in a driving system of a traditional walking robot can be solved effectively, heating of a system is reduced, and the energy utilization rate is improved.

The invention provides an extend range type electric passenger vehicle with an engine arranged at the front position. The extend range type electric passenger vehicle comprises the turbine shaft engine (2), a battery pack (3), an electric generator (4), a drive motor (6), a storage tank (9) and a split type heat regenerator (12). The extend range type electric passenger vehicle is characterized in that the turbine shaft engine (2) is arranged and installed on an automobile frame above a front axle; the axis of an output shaft of the turbine shaft engine (2) is located on a symmetry plane of an automobile body; the split type heat regenerator (12) is located below the turbine shaft engine (2); and exhaust gas exhausted out of the turbine shaft engine (2) is adopted by the split type heat regenerator (12) for preheating inflow gas of the turbine shaft engine (2). By the adoption of the extend range type electric passenger vehicle, a gas turbine is adopted as a power source and arranged at the position on the symmetry center line above the automobile front axle, an output shaft of the gas turbine is longitudinally arranged, and the extend range type electric passenger vehicle has the beneficial effects that the energy conversion efficiency is high, a front wheel, a rear wheel, a left wheel and a right wheel bear weight in a balanced manner, the operation performance is good, and the running mileage is large.

The invention discloses a high-precision valve micro pump driven by a temperature control shape memory alloy. The high-precision valve micro pump comprises a temperature control shape memory alloy spring II, a temperature control shape memory alloy spring I, a cooling ceramic pipe, an upper end cover, a pump body shell, a piston I end cover, a slide bearing, a snap spring, a connecting flange, an external driving joint, a piston II, a one-way valve, a pump cavity, a piston I, and electrifying terminals A, B, C and D; the cooling ceramic pipe is fixed on the upper end cover; the temperature control shape memory alloy springs I and II are inserted in the cooling ceramic pipe, and are positioned on two sides of the piston I end cover; the piston I can slide in the slide bearing; the slide bearing is mounted on the pump body shell; and the pump cavity is connected with the pump body shell through the connecting flange. Compared with a traditional micro pump, the high-precision valve micro pump is excellent in structure heat dissipating property, tightness and one-way stop performance, and can normally work under the condition of high frequency by using the cooling effect of the cooling ceramic pipe.

The invention discloses a hydraulic valve block lightweight design method based on selective laser melting. The method comprises the following steps that (1) material selection is carried out; (2) a single flow channel of a hydraulic valve block is subjected to trial-manufacturing, and therefore the wall thickness and section shape of the flow channel are determined; (3) boundary constraint conditioners are set; (4) the hydraulic logic of the hydraulic valve block is extracted; (5) modeling and optimization design of a main work flow channel are carried out; (6) local structure modeling and optimization design are carried out; (7) selective laser melting forming process parameters are regulated and controlled; (8) a hydraulic valve block model is subjected modeling, form manufacturing andaftertreatment operation; and (9) forming quality inspection and performance testing of the formed valve block are carried out. According to the hydraulic valve block lightweight design method based on selective laser melting, the technological process of hydraulic valve block manufacturing and detecting is redesigned through selective laser melting, the weight of the hydraulic valve block is reduced greatly through the additive manufacturing technology, the flowing performance of fluid is improved, the power-to-weight ratio is increased, and the hydraulic valve block lightweight design methodhas god application prospects on the aspects of aerospace and war industry.

The invention discloses a distributed propelling tail-mounted vertical take-off and landing fixed wing aircraft which comprises a fuselage, wings, a vertical tail wing, a landing gear, an elevon, a rudder, an internal combustion engine propulsion system, an electric propulsion system, a fuel oil tank, a battery pack and a flight controller. According to needs of cruising power, an internal combustion engine is selected, insufficient thrust and power during vertical take-off and landing are provided by the electric propulsion system, by the propulsion system collocation, the problem of great power differences of vertical take-off and landing and cruising of a vertical take-off and landing aircraft can be solved, and the problem of insufficient control ability of a tail-mounted aircraft in the vertical takeoff and landing process can be solved by distributed propulsion of a plurality of propulsion systems. The distributed propelling tail-mounted vertical take-off and landing fixed wing aircraft has the advantages of high push / heavy ratio, high energy utilization rate and strong control ability and the like.

The invention discloses a combined function device simultaneously having drive and sensing capabilities and preparation and application of the device. The combined function device comprises a piezoelectric layer, wherein the piezoelectric layer consists of a PVDF (Polyvinylidene Fluoride) film; the composite material uses an ion exchange enhanced conductive layer as a center, the upper side and the lower side are symmetrically provided with the piezoelectric layer and an electrode layer from inside to outside; the piezoelectric layer is arranged in such a way that a positive electrode and a negative electrode at two sides mutually correspond to each other by using the ion exchange enhanced conductive layer as the center; the ion exchange enhanced conductive layer is obtained by curing and molding an ion exchange solution, and the ion exchange solution is Nafion solution with uniformly added nanograde conductive particles; the piezoelectric layer is the PVDF film; and the electrode layer can be a plurality of latticed mutually-separate microelectrodes which consist of metal Ag or Al, and each of the microelectrodes is mutually isolated and is electrically connected with a drive source or a sense source according to design demand. Large deformation can be outputted under a relatively low actuation voltage, therefore, the combined function device has a large power to weight ratio.

The invention discloses a double-piston-rotor internal combustion engine. A first rotor comprises a rotating shaft disc, two first piston bodies are arranged at one end of the rotating shaft disc, a first rotating shaft provided with a first egg-shaped gear is installed at the other end of the rotating shaft disc, and the bottom face of a cover plate is connected with the end faces of the first piston bodies. A second rotor comprises a second rotating shaft, two second piston bodies are arranged at one end of the second rotating shaft, a second egg-shaped gear is installed at the other end of the second rotating shaft, the second rotating shaft is installed in a shaft hole of the first rotating shaft in a penetrating mode, and the second rotating shaft and the first rotating shaft are jointly installed in a shaft hole of a disc-shaped piece in a penetrating mode. An upper end disc and a lower end disc of the disc-shaped piece are connected with a combustor shell and a flange of a gearbox through bolts respectively. A power output gear shaft is installed in a shaft hole in the bottom of the gearbox. Upper egg-shaped gears of two double-egg-shaped gear shafts are meshed with the first egg-shaped gear and the second egg-shaped gear respectively, and lower egg-shaped gears of the two double-egg-shaped gear shafts are meshed with two egg-shaped gears on the power output gear shaft respectively. The double-piston-rotor internal combustion engine is low in oil consumption, high in power-to-weight ratio, large in output torque, low in vibration, simple and compact in structure, easy to design and good in manufacturability.

The invention discloses a detachable hydraulic cylinder with a carbon fiber composite for connection and load bearing. The detachable hydraulic cylinder comprises an end cap, a cylinder head, a cylinder barrel outer layer, a cylinder barrel lining, a cylinder bottom, a piston rod and a piston. The cylinder barrel outer layer is formed by adopting high-strength carbon fibers as reinforcing material and epoxy resin as a substrate, and winding the carbon fibers on a cylinder barrel assembly metal part by adoption of a contact molding method. Compared with a metal hydraulic cylinder, the detachable hydraulic cylinder has the advantage of being remarkably low in weight; compared with an existing composite hydraulic cylinder, by adopting a composite body as the connection structure, the reliability is higher than that of adhesive connection; due to the fact that threads, bolts and pins are not adopted for connection between the composite and metal parts, the composite structure is not locally damaged by machining, the continuity and integrity of the carbon fibers are guaranteed, and the advantage of high strength of the carbon fibers is given full play to the greatest extent; and a cylinder barrel assembly can be separated from other assemblies, so that the maintenance cost and difficulty of the detachable hydraulic cylinder are lower than those of an integral composite hydraulic cylinder.

The invention provides a rotary shell type nonstop rotating pendulum engine. The rotary shell type nonstop rotating pendulum engine is characterized by comprising an energy conversion assembly and a differential driving assembly of the engine, wherein the energy conversion assembly is composed of a rotary power cylinder block and two rotors; the differential driving assembly is composed of a pair of oppositely-arranged crank and rocker mechanisms and a planetary gear structure, and the phase difference of the differential driving assembly is pi; since the rotational speeds of rotating pendulums of the two rotors in a power cylinder are different, the volume of a chamber in the cylinder is reduced and expanded; consequently, the four-stroke heat engine cyclically does work, and the minimum value of the rotational speed of any rotor is larger than zero, that is, the rotors run without stop; a transmission mechanism connected with an output shaft is arranged; the power cylinder is only provided with an air inlet / outlet and an ignition port, and a valve and other complex components are not needed. The rotary shell type nonstop rotating pendulum engine has the advantages that the structure is simple, the size is compact, and the weight is substantially reduced; since no large-mass component does reciprocating motion, the impact load is low, high-speed operation is facilitated, and the service life is prolonged; the operating rotational speed is high, the rotors run without stop, output power and torque are higher, and the power-to-weight ratio is high.

The invention discloses a combined type combustion chamber for a two-stroke high-power cross-ratio aviation heavy oil plunger engine. The combined type combustion chamber comprises a cylinder body, a cylinder sleeve, a cylinder head, a plunger and a mono-block pump; the cylinder head is fixed to the top of the cylinder body, the cylinder sleeve is fixed in the cylinder body, and the plunger is arranged inside the cylinder sleeve; a concave pit A is designed in the middle of the top surface of the plunger, a concave pit B is designed in the middle of the bottom surface of the cylinder head, and the concave pit A and the concave pit B are all shallow pits; the concave pit A, the concave pit B and the cylinder sleeve are combined together to form the combined type combustion chamber; and the mono-block pump is fixed to the cylinder head, a nozzle of the mono-block pump extends into the combined type combustion chamber, and nozzle holes of the nozzle are located in the concave pit B. Two air inlets and one air outlet which are opposite to each other are designed and formed in the side wall of the lower portion of the cylinder body. According to the combined type combustion chamber, the structure is compact, the power to weight ratio is big, the combustion speed is high, and the maximum combustion pressure is small; the combustion temperature is low, and the air-exhausting quality is good; and the scavenging form is rotational flow scavenging, the charging loss is effectively lowered, and the volume efficiency is improved.

The invention belongs to the technical field of aircraft fuel systems, and relates to a design and a structure of a brushless multi-working-condition direct-current electrically-driven pump. The brushless multi-working-condition direct-current electrically-driven pump is characterized in that a brushless direct-current motor with multi-state working capability drives an impeller which is arranged on a shaft of the brushless direct-current motor to rotate; pumping fuel oil flows through a filter screen, a pump core shell and the impeller to be subjected to centrifugal supercharging, then flows into a radial guide vane for further diffusion supercharging and flows in an axial direction; the supercharged fuel oil passes through an annular flow channel positioned between a pump cover and the shell of the motor to converge and is output through a check valve at the top of the pump cover and a valve shell. The former fuel delivery pump is designed according to the maximum working condition even if being in multiple working states and has no self-adjusting capability, the flow pressure is controlled by virtue of an adjusting valve and the working is carried out on a single curve; however, due to the multiple working conditions which are designed for being matched with the brushless multi-working-condition direct-current electrically-driven pump, the requirement on the current working condition can be rightly met when the pump is in various states, and the pump works on a group of similar flow and pressure curve so as to form a larger working enveloping range.

The invention discloses an integrated displacement amplifying mechanism and a moving method thereof. The mechanism uses pulleys to form a U-shaped wire winding mode; and the displacement amplifying mechanism uses a memory deformation effect of SMA wires for converting a horizontal motion to a vertical motion, and realizes the displacement amplification. The moving method realizes a double-travel motion, and increases effective length of shape memory alloy wires in limited mechanism space, so that the deformation is increased, and the mechanism space is saved; an optimized implementation mode can realize an excellent temperature control effect of the shape memory alloy wires through a closed box body; the quick heating of the shape memory alloy wires can be realized through feeding a lot of hot air in a ventilation pipe at the top end of the box body or feeding a certain current in a SMA; and the SMA wires can be quickly cooled by feeding in low-temperature cold air, so that the mechanism acting speed is accelerated.

The invention discloses a nesting type shape memory alloy pneumatic artificial muscle. The nesting type shape memory alloy pneumatic artificial muscle comprises an upper fixing disc, fixing rods, axial SMA wires, a sliding disc, a pneumatic muscle body, a PM lower installing disc, a lower fixing disc, a sliding square shaft, a rotating shaft, a PM upper installing disc, springs, radial SMA wires, a drive circuit, upper fixing disc wiring holes, a rotating shaft hole, sliding disc rod penetrating holes, sliding disc wiring holes, lower fixing disc wiring holes and a square hole. The pneumatic muscle body is nested in a fixing frame, and accordingly the device structure is compact. The axial SMA wires are wound many times, the effective length is increased, large deformation is generated, muscle bundles are pulled, the contraction amount of the muscle bundles is increased, and through the wire delaying circulation effect generated due to superelasticity of the wires, influences generated by load vibration can be relieved; through contraction of the radial SMA wires, muscle bundle rotation is achieved, and the rigidity of the pneumatic muscle body is changed; and compared with the same-type pneumatic muscle on the market, the pneumatic muscle is compact in structure, large in contraction amount and wide in rigidity changeable range.

The invention relates to an electrical conductor which is made up substantially of one or even several metal conductors which are sheathed by a graphene layer. Particularly in the case of the electrical conductor transporting an alternating current, the current in the conductor is forced radially outwards and therefore flows in the graphene layer. Since graphene has a substantially better conductivity than the materials customary in this application, such as copper for example, relatively low losses are accordingly produced and substantially higher degrees of efficiency can be achieved. The electrical conductor constructed in this way is used in a stator and / or rotor winding of an electrical machine, so that it has a significantly elevated power-to-weight ratio.

The invention relates to an engine valve mechanism and a horizontally opposed double-cylinder engine. The engine valve mechanism comprises a drive assembly and a valve assembly driven by the drive assembly, wherein the drive assembly comprises a camshaft vertical to a crankshaft space, tappets driven by a cam, tappet rods driven by the tappets and a valve rocker arm assembly which swings and drives the valve assembly under drive of the tappet rods; a crankshaft with timing driving teeth directly drives the camshaft with timing driven teeth, and then the tappets and the tappet rods drive valverocker arms to drive an intake valve and an exhaust valve to open and close back and forth. The engine valve mechanism avoids gear or chain transmission connection modes, and has higher transmission efficiency and lower engine development and maintenance costs. The tappets and the tappet rods are arranged outside an engine body, so that size of an engine is reduced, the engine is lightweight, andthe power to weight ratio of the engine is increased; besides, the included angle between the valves of the valve mechanism is 0, intake resistance can be reduced to the greatest extent, intake efficiency is improved, the application field of the engine is expanded, and the structure is simple and compact.

The invention relates to an integrated electro-hydrostatic servo mechanism, and belongs to the technical field of electro-hydrostatic actuators. The integrated electro-hydrostatic servo mechanism is composed of a pipe connector, a cylinder bottom, a valve block, a small motor, a large motor, a navigating socket, a motor supporting point, a piston cylinder barrel, an SIG20 rod end, an air inflation valve, a small motor driver, an oil supplementing box, a manual bypass valve, a pressure sensor, a temperature sensor, an oil supplementing valve, a safety valve, a vent valve, a variable pump, a knuckle bearing, an air filter, an oil pump oil pipe, an oil release pipe, an LD type displacement sensor measuring head, an annular magnet, an energy accumulator piston, a cylinder bottom guide rod, a fan-shaped gear and a cylinder barrel. An oil cylinder of the integrated electro-hydrostatic servo mechanism is composed of the piston cylinder barrel, the cylinder bottom guide rod and the cylinder barrel. The integrated electro-hydrostatic servo mechanism has the beneficial effects that the system structure is simple, the power to weight ratio is large, efficiency is high, and the safety is greatly improved.

The invention discloses a dual-motor propulsion system and a control method thereof. The method comprises the steps that a main motor controller communicates with the outside to receive a rotating speed instruction and feeds back state information of a motor to the outside; a rotating speed instruction is received from the motor controller and external communication, and state information of the motor is fed back to the outside; wherein the rotating speed instruction comprises a main rotating speed instruction of a main motor and a slave rotating speed instruction of a slave motor; the mastermotor controller and the slave motor controller are in internal communication to transmit data to each other. According to the control method of the dual-motor propulsion system, the dual motors can be effectively controlled to output the rotating speed and the torque in a balanced mode according to the rotating speed instruction and the propeller load, the system has the advantage of being good in fault tolerance based on cooperative control and redundancy design, and it can be guaranteed that the whole motor system can continue to work when part of faults occur.

Provided is a non-similar redundancy electric steering device. The advanced power-by-wire technology and volumetric speed control principle are adopted, and two sets of motors drive a hydraulic pump system to directly drive a double-redundancy series cylinder. The device comprises a set of double-redundancy electro-hydrostatic servo mechanism (2) and a set of double-redundancy driving controller (7), wherein the double-redundancy electro-hydrostatic servo mechanism (2) is composed of an electro-hydraulic pump servo mechanism (1) and a double-variant motor pump source servo mechanism (4), and the double-redundancy driving controller (7) is composed of a control unit (8) and a driving unit (9); the electro-hydraulic pump servo mechanism (1) comprises an electro-hydraulic pump (10) and accessories, and the double-variant motor pump source servo mechanism (4) comprises a servo motor (6), a two-way variable pump (5) and accessories. The device can replace an original servo valve-controlled steering engine arranged on a vehicle to achieve high-reliability and high-power telex servo working and has the advantages of being low in energy consumption, small in size and weight and easy to install and maintain.