175 results about "Power-to-weight ratio" patented technology

An ergonomically efficient cordless power tool system having desired power-to-weight ratios may be configured by reducing weight in one or more constituent weight groups of a given cordless power tool system, while maintaining or improving the total power output of the tool system. An example cordless power tool system may be configured to output a maximum power of at least 475 watts, and have a maximum power output to weight ratio of at least 70 watts per pound (W/lb).

A transformer for low frequency applications of from 50 Hz to 1000 Hz is described. The transformer comprises a core having a cylindrical symmetry around a main revolution axis. The core is formed of a soft isotropic magnetic composite material composed of iron and resin. Windings are enclosed in the magnetic core and disposed about a central column of the magnetic core and magnetically coupled with the inductor for low frequency applications, DC to 1000 Hz of similar construction is also described, the inductor comprises a core having a cylindrical symmetry around a main revolution axis. The core is formed of a soft isotropic magnetic composite material composed of iron and resin. Winding is enclosed in the magnetic core and disposed about a central column of the magnetic core and magnetically coupled with the magnetic core. The core is formed by core sections.

A gearbox comprising a gearset is able to transmit high output torques at high numerical reduction ratios at a power-to-weight ratio higher than previously attainable with existing designs. A distributor gear is disposed relative to a spur gear in order to produce automatic torque balancing. The distributor gear can be advantageously configured as an input floatring gear, for which support in all directions is provided by gear tooth mesh forces rather than bearings. Automatic torque balancing is achieved by configuring the distributor gear with first and second rows of helical teeth on the external circumference, and with a set of double helical teeth disposed on the internal circumference of the distributor gear. This allows for the placement of up to 50 or more planet gears in a countershaft arrangement with one end having helical teeth and the other end having spur teeth.

A two stroke cycle internal combustion engine machine that does not require lubricating oil to be mixed with its fuel, producing greater efficiency, higher power to weight ratio, cooler operating temperatures, a wider speed range, greater simplicity, and lower toxic emissions, many of the improvements also transferable to four stroke engines.

A foldable, portable, lightweight photovoltaic module has a carrier layer divided into equal sections separated by hinge spaces, a substrate layer on the carrier layer, and a photovoltaic cell layer on the substrate layer, wherein the hinge spaces each have a free space between opposing edges of the adjacent sections to enable them to be folded in accordion-like fashion for storage. The carrier layer may be made of rip-stop fabric and preferably supports 6 sections each with 6 PV cells of crystalline silicon of up to about 22% conversion efficiency. The module has a power output of about 122 watts at 24 volts, and weighs about 7.4 pounds (3.36 kg), with a power-to-size ratio of 14 watts/sft or more, and a power-to-weight ratio of 16.5 watts/pound or more. An improved method of lamination applies heat and pressure on upper and lower sides of the laminate layers through upper and lower chambers with respective pressure bladders and heaters that are independently controllable.

An engine for providing rotary power about an output shaft with a high power-to-weight ratio includes a plurality of flow guiding blades mounted on the inner surface of an annular thruster base. The flow guiding blades cooperate with the peripheral surface of a rotor for forming a plurality of ramjet-like thrusters. The configuration of the flow guiding blades allows for optimization of the number of thrusters. The centrifugal forces generated by the rotating components is compensated by an annular reinforcement wall made with high strength materials allowing for downsizing of the rotor and associated components.

An internal combustion rotary engine, self cooled, totally concentric and symmetric, dynamically variable compression ratio, capable of developing multiple Otto cycles in each rotation, by means using modules, composed mainly by a solenoid gate valve and three chambers operating at the rotor periphery, producing at low RPM, torsion of value near close at theoretical limit. High power/weight ratio, which increases substantially when number of modules increase, without drive shaft length increase; plus reduced internal friction, is a truly saver fuel machine; with volumetric asymmetry ratio between expansion and compression chambers, and that compression chambers working at beginning of the cycle at normal atmospheric pressure, it gives a fast rise pressure peak, because of the almost wedged form of that chambers. Proper for many types of combustion and class of fuels, including hydrogen, liquefied propane gas and efficient use of air compressed as external energy supply. Excels in aircraft use.

An engine configuration that places multiple pistons on one or two oscillating discs. The engine can be configured to operate as an internal combustion engine that uses diesel fuel, gasoline, or natural gas, or it can be configured as an expander to convert high pressure high temperature gas to rotary power. For any given set of choices of numbers of pistons and sizes of pistons, disks, and gears, there are disclosed dimensional constraints useful for more efficient functioning of the engine. This engine is especially suited as a driver for electrical power generation as it delivers high torque at low engine speeds, among other uses. Its compact design results in high power to weight ratios.

The invention provides a dual-rotor axial disk-type permanent magnet motor. A dual-motor and intermediate stator mode is adopted in structural layout, and magnetic flow is axial in direction; dual rotors output rotation speed and torque through a rotating shaft connected with the dual rotors, and permanent magnets arrayed in a trapezoid halbach form are arranged on inner sides of the rotors. The motor stator is designed in a non-yoke structure and adopts a multi-tooth combination and is fixed on a main case; the main case is in topology design, vent holes are arranged in the surface of the main case, and passive heat dissipation of the motor is facilitated; the dual-rotor axial disk-type permanent magnet motor has the advantages of small size, light weight and high power-to-weight ratio and is applicable to equipment of electric and hybrid cars, aircrafts and the like. The invention further relates to a non-rotor core structure design, and the power-to-weight ratio of the motor is further increased.

The invention discloses a centrifugal type fuel cell air compressor with an energy recovery function. The centrifugal type fuel cell air compressor comprises a motor, an air compressor casing, an expander casing and an air inlet cover; an air compressor impeller and an expander impeller are mounted at one end of a motor shaft, and the air compressor impeller and the expander impeller are correspondingly surrounded by the air compressor casing and the expander casing to form a compressed air runner and an expander runner; and a by-pass valve is arranged between the compressed air runner and theexpander runner. According to the centrifugal type fuel cell air compressor with the energy recovery function, a centrifugal type air compressor and a turbo expander are adopted and matched to recover exhaust energy of an electric pile, and the efficiency of a system is improved; by adopting the scheme of back-to-back integrated design of the air compressor and the expander, the whole system is compact, the power weight ratio is large, and the efficiency is high; and through control of the by-pass valve, the situation of surge under the condition that air flow of the supplying electric pile is small is avoided, and meanwhile, bypass air energy can also be recovered through the expander.

The invention discloses a rotation piezoelectric energy collecting device which comprises stators and a rotor. A plurality of piezoelectric assemblies are installed on the inner sides of the stators, and each piezoelectric assembly is composed of stator magnetic steel, a piezoelectric sheet and an insulation sheet; a plurality of pieces of rotor magnetic steel are installed on the outer side of the rotor. The rotation piezoelectric energy collecting device solves the technical problems that the vibration noise is high, the electro-mechanical conversion efficiency is low, and output voltage ripples are large are solved. The stator magnetic steel and the rotor magnetic steel are matched in three modes, the polarities of the stator magnetic steel are the same, and the polarities of the adjacent rotor magnetic steel are opposite; or the polarities of the adjacent stator magnetic steel are opposite, and the polarities of the rotor magnetic steel are the same; or the polarities of the stator magnetic steel and the polarities of the adjacent rotor magnetic steel are both opposite. The stators can be in a discrete piezoelectric stack mode and can be distributed in the circumferential direction of the rotor in an even or grouping symmetry mode. Springs and mass blocks can be further installed in the piezoelectric stacks to sufficiently absorb low-frequency energy. The rotation piezoelectric energy collecting device has the remarkable advantages of being high in electro-mechanical conversion efficiency, high in power-to-weight ratio, small in torque ripple, low in vibration noise, wide in output voltage frequency and the like.

The invention adopts a motor and hydraulic motor dual-input differential structure and a two-stage planetary gear pair transmission output mechanism by aiming at the defect of the traditional drive system of the tunnel boring machine. An electromechanical-hydraulic composite type main drive system comprises a power device, a variable-speed transmission system and a power input mechanism, wherein the power device is a dual-input power device and comprises a power input assembly motor and a power input assembly hydraulic motor, and an output end of the hydraulic motor is provided with a braking device. For the power input of the drive system, a manner of motor and hydraulic motor dual-drive differential input is adopted, and two output working conditions can be obtained by changing the drive manners of the motor and the hydraulic motor, so that the tunnel boring machine can be guaranteed in normal work and can be guaranteed to get out of troubles; and compared with a mechanical transmission manner, the hydraulic motor is rapid and stable in driving, can acquire large torque more easily, and further has the advantages of small size, high power-weight ratio, convenience for layout, long service life and the like.

Contemplated gearboxes combine a high numerical reduction ratio with the capability of transmitting power at a superior power-to-weight ratio using a compound star planetary gearbox configuration that is radially expanded using hollow driveshafts to link the planet gears. In most preferred compound planetary gear arrangements, planets of different diameter are torsionally connected to each other, or mesh with each other. Input and output gears counter-rotate while the planets rotate in bearings anchored to a static casing.

The invention provides a method and a system for acquiring the cargo transport lane traffic capacity of a passenger and cargo separating expressway. The method is characterized by comprising the steps of acquiring traffic information data of a section of an expressway cargo transport lane; calculating the axle number of each vehicle in the traffic information data, and selecting a type of vehicles with the axle number occupying the highest proportion as a standard vehicle; clustering all of the vehicles in the traffic information data according to a power-to-weight ratio and overall dimensions, and classifying the vehicles in the traffic information data into M categories according to vehicle types on the basis of a clustering result, wherein the power-to-weight ratio and the overall dimensions of the standard vehicle fall into a certain category of the M categories; acquiring an equivalent convert coefficient of each vehicle type relative to the standard vehicle at a non-car-following state and a car-following state, wherein the equivalent covert coefficient of the vehicle type to which the standard vehicle belongs relative to the standard vehicle is 1; and acquiring the traffic capacity of the section of the expressway cargo transport lane at the non-car-following state and the car-following state under conditions of any vehicle type mixing ratio by being combined with a traffic capacity calculation model according to the equivalent covert coefficients.

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.

A puller is provided with a number of advantages. Pullers are described that have a high power to weight ratio, and a high power to volume ratio. Examples of pullers and pulling systems include configurations that provide high cable friction in a small device volume. Examples of pullers and pulling systems also include constant force pulling which is desirable in particular for small diameter pipe replacement. Using pullers and pulling systems as described, minimally invasive pipe replacement operations are possible. Reversible pullers are also provided that decrease the amount of time needed to burst or split multiple segments of pipe.

The invention provides an electric actuator for actively adjusting a main reflection face of a large-size radio telescope. The electric actuator comprises a box body, a worm gear, a worm, an intelligent step motor, a screw nut, a ball screw, a cylinder guide sleeve, an upper guide sleeve, a supporting board, a supporting rod, a plastic bearing, a limiting stopper, a zero-position sensor, a screening box and an aviation socket, wherein the intelligent step motor is connected with the worm; the worm gear and the screw nut are fixed together; the ball screw is connected with the cylinder guide sleeve through a spline; the cylinder guide sleeve is fixedly arranged on the box body; the upper guide sleeve is fastened to and connected with the upper end of the ball screw; the supporting board is fixedly connected with the upper guide sleeve; the supporting rod is fixedly connected with the supporting board; the plastic bearing is sandwiched between the cylinder guide sleeve and the upper guide sleeve and is in interference fit with the upper guide sleeve; the limiting stopper is fixed at the lower end of the ball screw; the zero-position sensor is fixedly arranged on the box body and can be in contact with the limiting stopper; the screening box is fixedly arranged on the box body; and the aviation socket is connected with the screening box. The electric actuator provided by the invention has the advantages of high positioning precision, large power weight ratio, capability of bearing lateral force, water resistance and dust resistance, electromagnetic radiation resistance and high reliability and has a power supply-free self-locking function.

A permanent magnet rotor of a brushless direct current (BLDC) motor, in which cogging torque ripple and electromagnetic vibration noise transferred to the permanent magnet rotor can be blocked and a motor's power-to-weight ratio can be improved. A conventional BLDC motor has to use an electric steel sheet core so as to maintain the maximum magnetic flux density of the permanent magnet rotor and to minimize a rotating electric field loss. As a result, cogging torque vibration is unavoidably transferred to a load side through the motor rotary shaft. However, the rotor can enable stable driving of the BLDC motor by innovatively blocking the cogging torque vibration and the electromagnetic vibration noise and can greatly reduce the motor's weight by using a plastic or non-magnetic material instead of an electric steel sheet core.

The invention discloses an integrated electro-hydraulic servo mechanism for a cabin. The servo mechanism is composed of a body, a motor pump combination, a hydraulic assembly, a mechanical transmission mechanism and a control mechanism, wherein the motor pump combination, the hydraulic assembly, the mechanical transmission mechanism and the control mechanism are integrally installed on the body. After being powered on, a motor drives a constant-pressure variable pump to rotate so as to enable electric energy to be converted into hydraulic energy; the hydraulic assembly is mainly composed of an oil tank, a pressurization component, a check valve, a high-pressure safety valve, a low-pressure safety valve, a filing valve, a high-pressure oil filter, a low-pressure oil filter, a hydraulic cylinder, an energy accumulator, an electro-hydraulic servo valve and the like; the mechanical transmission mechanism comprises a piston connecting rod, an actuating cylinder, a rocker, a connecting rod mechanism, a locking mechanism and the like; the control mechanism comprises a plug, a socket, a linear displacement sensor used for detecting the position of a piston rod in the actuating cylinder and a control circuit board for achieving closed loop of a system. The servo mechanism has the advantages of being high in power-to-volume ratio and power-to-weight ratio, rapid in response, high in rigidity, high in control accuracy and the like.