53results about How to "Large inertia" patented technology

The invention discloses an energy storage control system used for wind electric power regulation and control. A wind electric field is connected with a high-voltage bus through a first boosting transformer, and an energy storage system is connected with the high-voltage bus through a second boosting transformer. The high-voltage bus is connected with an alternating-current power grid. The energy storage system comprises an energy storage medium, a power converter and the energy storage control system. The energy storage medium is connected with the second boosting transformer through the power converter. The energy storage control system collects wind electric field real-time power, the charged state of the energy storage medium and power grid frequency information and outputs control signals to the power converter. The grid-connected wind electric power characteristics are improved by the energy storage technology, the fluctuation of the wind electric power is inhibited, the frequency change of the power grid is simultaneously responded, and inertia response characteristics of a common set are simulated; in addition, energy storage control system can be flexibly switched to a frequency control mode and participate in primary frequency modulation of the power grid, so that the negative influences of wind power grid connection on the grid frequency are effectively reduced.

The invention belongs to the technical field of wind power generation, and discloses a comprehensive control system adopting a doubly-fed wind generator participated in power grid primary frequency modulation. The control system comprises a rotor rotary speed control module, a simulation inertia control module, a droop control module, a rotary speed protection and power determination module and apitch angle control module. After the wind generator is participated in frequency modulation, the power grid inertia is equivalently enlarged, so that the doubly-fed asynchronous wind generator can have inertia response on the power grid frequent as the conventional synchronous generator, thereby lowering change rate of the power grid frequency; and by controlling the rotary speed and the pitch angle, the wind generator output is lowered, so that the wind generator has certain active backup capacity to be participated in primary frequency modulation, thereby lowering steady-state error of thefrequency.

The invention provides an in-orbit expansion-type satellite structure which comprises a plurality of satellite body modules with the same configuration arranged along circumference, wherein the adjacent satellite body modules are connected by an expansion-type truss, and a corresponding satellite body connecting and unlocking device is disposed between the adjacent satellite body modules; at a launch stage, the satellite body modules are connected by the satellite body connecting and unlocking device into a whole, so a satellite body is retracted and satisfies a demand for carrying and enveloping during the launch; when the satellite body enters an orbit, the satellite body connecting and unlocking device works to realize unlocking among the satellite body modules, and the satellite body modules realize in-orbit expansion under effect of the expansion-type truss; and during in-orbit work, in-orbit high-rigidity locking of the expansion-type truss is realized by a locking mechanism of the expansion-type truss. The in-orbit expansion-type satellite structure provided by the invention solves the contradiction between that the satellite body cannot exceed a carrying limit and that the satellite shall satisfy a structural configuration demanded by an in-orbit large load, and provides an engineering solution manner for subsequent applications of the large load.

The invention discloses a loading support for an aircraft, the aircraft and a shock absorption method for the aircraft. The loading support for the aircraft is used for being connected with the rack assembly of the aircraft by a shock absorption assembly; the loading support comprises a carrying platform assembly provided with a shooting device and a component installation position, wherein a component arranged on the component installation position is fixedly and integrally connected with the carrying platform assembly. By virtue of the mode abovementioned, according to the loading support, the aircraft and the shock absorption method disclosed by the invention, the shock resistance performance of the loading support can be improved, thus improving the aerial photography effect of the aircraft.

The invention provides a composite ocean energy utilization device. The composite ocean energy utilization device comprises a base. A pipe body with the cross section being annular is vertically and fixedly connected to the base. The upper end of the pipe body is provided with a horizontally-arranged sealing plate. A rotating shaft is rotationally connected to the sealing plate. Fan blades are fixedly connected to one end of the rotating shaft, and the other end of the rotating shaft is connected with a generator. A water inlet is formed in the side wall of the lower end of the pipe body. A spindle is rotationally connected in the pipe body. Impellers are fixedly connected to the lower end of the spindle. The upper end of the spindle is located on the upper portion of the pipe body. A transmission structure is arranged between the upper end of the spindle and the rotating shaft, and when the rotating shaft rotates, the transmission structure can drive the spindle to rotate. A vent hole is further formed in the side wall of the upper end of the pipe body. A valve capable of controlling the vent hole to be opened and closed is fixedly connected to the vent hole. The composite ocean energy utilization device has the advantages that a self protection function is achieved, and wind energy and tidal energy are used for generating electricity.

The invention relates to a servo motor with an inertia disk and an installation method for the servo motor. The servo motor with the inertia disk comprises a shell, a stator and a rotor, wherein a front end cover and a rear end cover are arranged at the front end and the rear end of the shell; the inertia disk is arranged on the rotor; the inertia disk is located between the stator and the rear end cover; the stator is fully filled with a potting adhesive to become a potted stator; a wire fixing body which is formed by potting protrudes on the rear end surface of the potted stator; a wire led out from the stator penetrates through the wire fixing body and is led out of the shell; and the wire fixing body is located between the shell and the inertia disk. The installation method comprises the steps as follows: a front bearing, the rotor, the inertia disk, a rear bearing and the rear end cover are arranged to form a component A; the shell, the stator and the front end cover are potted to form a component B after being installed; the component A is enclosed into the component B from the rear end of the shell; and an encoder and a rear cover are arranged. According to the servo motor, the inertia of the motor can be conveniently increased to drive a heavy load; the inertia can be flexibly adjusted; time and labor are saved; the cost is reduced; and the servo motor is simple to assemble and convenient to install.

The invention relates to a current control method used for a high-voltage transducer. In the method, an accurate instantaneous current effective value is obtained through a Clarke transform principle, and the output voltage of the high-voltage transducer is changed and the output current of a motor is automatically regulated and the output torque of the motor is rapidly and stably controlled through changing the PWM (Pulse Width Modulation) working state of a power unit. The method can be used for accurately and rapidly measuring the instantaneous current value, and changing the voltage of the motor and stably controlling the output torque of the motor through controlling the PWM waveform output of the power unit, thereby realizing the function of rapidly and accurately controlling the torque by the high-voltage transducer at a frequency of 0-50HZ, especially at a low speed.

The invention discloses a virtual synchronous generator control method based on inertia and damping self-adaption, and belongs to the field of micro-grid operation control. According to the method, a self-adaptive relation between inertia and damping and an angular frequency change rate is designed, so that the system can freely configure inertia and damping according to system characteristics of different stages in a transient process of the system. When the system frequency is in an acceleration stage, the inertia needs to be increased to restrain the increase of the angular velocity of the virtual rotor. Although the large inertia can improve the anti-interference performance, the response speed can be slowed down, and therefore damping should be properly reduced at the same time in the stage to improve the response speed of the system. Meanwhile, according to the method, the threshold value of the angular frequency change rate is set, the inertia and damping change times are reduced, and it is guaranteed that the system is not affected during steady-state operation. According to the method, the overshoot and oscillation time of the system in the transient process are reduced, and the inertia of the system is effectively enhanced.

The invention provides drum flying shears. The drum flying shears comprise a rack, wherein the upper part of the rack is rotationally connected with a driving cutter shaft and a driven cutter shaft which are parallel and overlaid in a spaced manner, the driving cutter shaft and the driven cutter shaft have equal diameter and are connected through a transmission mechanism, a linear first cutter groove and a cylindrical-helix-shaped second cutter groove are formed in a spaced manner in the outer surface of the driving cutter shaft in the axial direction, a linear third cutter groove and a cylindrical-helix-shaped fourth cutter groove are formed in a spaced manner in the outer surface of the driven cutter shaft in the axial direction, the fourth cutter groove and the second cutter groove have identical helix angle and opposite rotating directions, and shear blades are arranged in the first cutter groove, the second cutter groove, the third cutter groove and the fourth cutter groove respectively; a drive mechanism is connected with the driving cutter shaft and drives the driving cutter shaft to rotate, and the driving cutter shaft drives the driven cutter shaft through the transmission mechanism to rotate synchronously in the opposite direction. According to the provided drum flying shears, thick and thin strips with large thickness change ranges are sheared, the shearing precision is guaranteed, and the shearing impact is reduced.

The invention discloses a force control end effector and an industrial robot. The force control end effector comprises a fixed platform, a movable platform and multiple motion assemblies. Each motionassembly comprises an active translational joint and a kinematic chain assembly, wherein one end of the active translational joint is connected with the fixed platform, the other end of the active translational joint is connected with one end of the kinematic chain assembly, and the other end of the kinematic chain assembly is connected with the movable platform. A displacement sensor is arrangedon each active translational joint, a pressure sensor is arranged on the movable platform, the displacement sensors and the pressure sensor are both connected with a controller, the controller adjuststhe output force of the active translational joints according to displacement signals and contact force signals fed back by the displacement sensors, and therefore the contact force between the wholeforce control end effector and a workpiece is adjusted. The rigid-flexible hybrid redundant drive force control end effector has the advantages of low inertia, large bearing capacity, high rigidity,impact resistance and high dynamic response.

The invention discloses a variable angular momentum engine, comprising an engine, wherein the power output shaft of the engine is connected with an angular momentum adjustable mechanism. The variable angular momentum engine realizes the matching of the engine under different rotation speed conditions by adjusting the angular momentum of the angular momentum adjustable mechanism according to the practical load of the engine or the load expected artificially, and has the advantages of simple structure, reliable operation, fuel-saving, environment-protection and good performance.

The invention overcomes the defects of easy creeping and inaccurate positioning of the X-shaft when modifying a planing machine into a milling planer, and provides an X-shaft transmission system for modifying a planing machine into a milling planer, which has the advantages of simple structure and favorable positioning performance and comprises a driving motor, a gearbox and a large transmission shaft, wherein the gearbox is connected with the output shaft of the motor, and the large transmission shaft is connected with the gearbox. The system is characterized in that the other end of the large transmission shaft is connected with a gear shaft arranged in the gearbox body, the gear shaft is provided with a left gear and a right gear which cooperate with a rack on a workbench, and a spacerfor always keeping the left gear a certain distance away from the right gear is arranged between the left gear and the right gear. The invention has the advantages that the transmission system is modified on the basis of the prior system so as to save the resources; all segments of the transmission system are treated in a rigidity enhancement mode so as to well solve the creeping phenomenon of theX-shaft; and especially, the system adopts two gears to engage with the rack so as to eliminate the gap.

The invention discloses a walking device and a walking system and method for the walking device, and belongs to the technical field of motion devices.The walking system comprises a supporting leg, and the supporting leg comprises a connecting rod mechanism, a rotation driving device used for driving the connecting rod mechanism to stretch out and draw back; a wheel carrier arranged on the connecting rod mechanism; an air cylinder; and a rotating shaft arranged on a connecting part, wherein the air cylinder can rotate around the rotating shaft; wherein the rotating shaft on the connecting part is parallel to the axis of the rotating shaft on the connecting rod mechanism; and the connecting part is also provided with a locking part. The walking device is based on the walking system, and the walking method is the walking method of the walking device. By the adoption of the technical scheme, the bearing capacity and the response speed of the walking device can be optimized, meanwhile, the structure is simple, and the walking device can well adapt to bumpy road conditions.

The invention discloses a method and system for improving the voltage control capability of a new energy station based on coordination control, and belongs to the technical field of power system control. The method comprises the following steps: 1, reading a voltage of a new energy station grid-connected point after a preset time interval with an initial voltage; 2, determining the variable quantity of the initial voltage of the grid-connected point of the new energy station and the voltage after a preset time interval, if the variable quantity is greater than a preset value, controlling the new energy station to enter a reactive power coordination control mode of the doubly-fed phase modifier and the SVG, and if the variable quantity is smaller than the preset value, controlling the new energy station to enter a reactive power control mode of the SVG; and 3, measuring the grid-connected point voltage after the new energy station enters the reactive power coordination control mode of the double-fed phase modifier and the SVG or the reactive power control mode of the SVG, and if the value of the grid-connected point voltage is between preset threshold values, controlling the new energy station to enter the SVG reactive power control mode. According to the invention, the voltage control capability and the short-circuit current capability of the new energy station are improved.

The invention relates to a swinging jib for a medical tower crane, which comprises a swinging jib sleeve, a hollow swinging jib which is arranged in the swinging jib sleeve and is connected with the swinging jib sleeve through a bearing, a brake apparatus arranged on the end surface of the hollow swinging jib, and a damping device arranged between the hollow swinging jib and the swinging jib sleeve, wherein the brake apparatus consists of a brake disc arranged on the end surface of the hollow swinging jib, an air pressure expansion ring arranged at an outer ring of the brake disc, an air source, and an expansion ring air pressure control device; and the damping device consists of a copper bushing and a connecting device which is arranged on the swinging rib sleeve and is connected with thecopper bushing. The swinging jib for the medical tower crane can ensure that a worktable is steady and slow during the movement and can stay still when the worktable moves to the required position, thereby ensuring that the worktable is steady and has reliable positioning.

The invention provides a power assisting device for a robot arm. The power assisting device comprises at least one assisting power source (such as a cylinder, a spring and a balance weight) arranged on a uniaxial rotary seat or a base of a robot, and a transmission tool connected with the output end of the power source, wherein the other end of the transmission tool is directly or indirectly connected with the robot arm. When the robot arm swings outwards under a load action to perform tilting action, the assisting power source provides reverse power assistance resisting the load gravity for the robot arm through the transmission tool, so that the power assisting requirement of the robot arm in different postures can be well met. A big enough assisting power can be provided, and the power assisting device can be well hidden and does not occupy the movement space of the robot.

The invention discloses a deep sea turbulence microstructure profiler which comprises a sensor group, a main body shell, a control main board and a main board pressure-resistant bin. The control mainboard is arranged in the main board pressure-resistant bin; the main board pressure-resistant bin is arranged in the main body shell; the sensor group is arranged at the head end of the main body shell, and the sensor group is in electric signal connection with the control main board; the gravity center of the deep sea turbulence microstructure profiler is arranged at a position close to the headend; the main body shell is hollow; a shell water inlet hole is formed in the portion, close to the head end, of the main body shell; and a shell water outlet hole is formed in the portion, close to the tail end, of the main body shell. The main body shell with the largest volume ratio in the whole instrument can be manufactured by adopting a pipe with a common wall thickness without considering the compression resistance design, so that the weight of the whole instrument is reduced, and the production cost is also reduced compared with the overall thickened compression resistance sealing design adopted by the existing equipment.

The invention discloses a jet flow division valve control method and a flow division valve control double-jet-pipe electro-hydraulic servo valve. Jet flow passes through a flow division splitting ringarranged in the middle of a shell of a flow division valve body through an impulse line and is sprayed out through spray nozzles at the top ends of jet pipes on the left side and the right side on the lower side of the valve body, so that jet divided output of the double jet pipes is achieved. An oil return opening is formed in the middle of a groove on the main valve body. A valve deck with a wiring terminal is arranged outside the control valve. The valve deck is connected with the main valve body through a screw. The size of an annular gap of double cones is controlled through a double-cone valve element, so that control over oil pressure and flow is achieved. The flow division valve control double-jet-pipe electro-hydraulic servo valve has the advantages that the impulse line is shortand high in rigidity and not prone to being influenced by environment vibration; the inertia of motion components is small, and dynamic response is rapid; a feedback spring rod is low in machining difficulty and easy to install; the anti-contamination performance is good, and the reliability is high. The flow division valve control double-jet-pipe electro-hydraulic servo valve provides a novel high-reliability key servo element for the Chinese national defense and the air transport industry.

The invention discloses an autonomous intelligent self-energy-supply active suspension adopting a double-head oil cylinder and a working method, and belongs to the field of automobiles, the autonomous intelligent self-energy-supply active suspension comprises a traditional vibration reduction structure and an anti-resonance vibration reduction structure, the anti-resonance vibration reduction structure is provided with the double-head oil cylinder, and the double-head oil cylinder is composed of a second oil cylinder arranged up and down and a second piston with piston rods at the upper end and the lower end; the upper portion of an upper oil cavity of the second oil cylinder is sequentially connected with an inerter spiral pipe, an intelligent control switch and the lower portion of a lower oil cavity of the second oil cylinder through a hydraulic pipeline, and the two ends of the intelligent control switch are connected with a normally-closed electromagnetic valve which is closed in a delayed mode in parallel. The intelligent control switch automatically changes the equal-inertial-capacity value and the equal-damping value of the anti-resonance vibration reduction structure along with changes of the vibration frequency of the automobile, when the vibration frequency of the automobile is low, large equal-inertial-capacity and equal-damping are provided to improve the driving safety, and when the vibration frequency of the automobile is high, small equal-inertial-capacity and equal-damping are provided to improve the riding comfort.

The invention discloses a forging press. The forging press comprises a crankshaft, one end of the crankshaft is provided with a brake, and the other end of the crankshaft is provided with a clutch; the clutch comprises a flywheel, a driven shaft sleeve and a driving disc which sleeve the crankshaft sequentially; the flywheel is installed on the crankshaft through bearings, the driven shaft sleeveand the driving disc are arranged in a concave cavity of the flywheel, and the exterior of the concave cavity of the flywheel is fixedly connected with a casing; the driven shaft sleeve is fixedly connected with the crankshaft, and the outer ring of the driven shaft sleeve is inlaid with a plurality of movable friction blocks; the driving disc sleeves the crankshaft in an idling manner and is connected with the casing through a plurality of drive pins in a circumferentially fixed and axially moving manner, the drive pins are sleeved with a plurality of springs, and the driving disc and the casing are slidably connected in a nested manner to form a cylindrical air cylinder cavity; and the cylindrical air cylinder cavity communicates with a vent hole formed in the center of the casing and issealed through a sealing ring arranged between the driving disc and the casing. According to the technical scheme, the separate structural design of the clutch and the brake is adopted, the structureis simple, and operation is reliable.

The invention relates to a servo motor with an inertia disk and an installation method thereof. The servo motor with an inertia disk includes a housing, a stator and a rotor. There are front and rear end covers at the front and rear ends of the housing. An inertia disk is installed on the rotor. The inertia disk is located between the stator and the rear end cover. The stator fills Filled with sealing glue to become the glue-filled stator, the rear end surface of the glue-filled stator protrudes from the back end surface of the glue-filled stator to form a wire fixing body. between the body and the inertia disk. The installation method is as follows: first install the front bearing, rotor, inertia plate, rear bearing and rear end cover to form component A, then install the shell, stator and front end cover and then pour glue to form component B. Put the rear end into component B, and then install the encoder and the rear cover. The invention can conveniently increase the inertia of the motor to drive large loads, can flexibly adjust the size of the inertia, saves time and labor, reduces costs, and is simple to assemble and install.

The invention discloses an automobile flywheel assembly comprising a flexible disc, a gear ring and a first mass block. The gear ring is arranged on the periphery of the flexible disc. The first massblock is arranged on the disc body of one side of the flexible disc. According to the automobile flywheel assembly provided by the invention, the mass of the flexible disc is increased through the first mass block so as to increase inertia of the flexible disc, and compared with similar design in the prior art, the automobile flywheel assembly has the advantages that on the premise that the layoutof an engine and a hydraulic torque converter is not changed, and the layout of other related parts is not influenced, rotational inertia is increased, and buffering and vibration abilities of a screw machine are improved. The automobile flywheel assembly provided by the invention is convenient to maintain and manage, meanwhile common materials are adopted, and the automobile flywheel assembly can be manufactured conveniently.

The invention discloses a steam-free operation system and method based on a thermal power intermediate reheating type condensing unit. The boiler is connected to the low-pressure cylinder through the high-pressure cylinder, the medium-pressure cylinder in sequence, and the outlet of the low-pressure cylinder is respectively connected to the condenser and the generator. The cooling gas produced by the high-pressure cylinder, medium-pressure cylinder and low-pressure cylinder is respectively connected to the cooler through the cooling bypass for cooling, and then after being pressurized by the booster pump, it is respectively passed into the high-pressure cylinder, medium-pressure cylinder and low-pressure cylinder for cooling. The unit of the present invention does not generate electricity after entering the no-steam operation mode, consumes the power of the power grid, improves the inertia of the power grid, plays the role of peak shaving and valley filling, and increases the power of the power grid to absorb renewable energy.

The invention discloses a workshop connecting structure with an upper capstan and a lower capstan and a vacuum pipeline train with the workshop connecting structure. The workshop connecting structure comprises an upper connecting point and a lower connecting point; the upper connecting point and the lower connecting point both adopt a hinged connection mode, the upper connecting point becomes an upper capstan, and the lower connecting point is called a lower capstan; the upper capstan comprises an outer column disc, an inner column disc and a first elastic element; the lower capstan comprises a concave disc, a convex disc and a second elastic element; by means of the structure, the problem that longitudinal loads between the mutually-communicated carriages are unbalanced due to the internal and external pressure difference of the train is effectively solved, the hinged connection mode between the carriages is achieved, and the safety of the train during high-speed running is improved; the connection strength between the carriages is increased, and the safety when a fault occurs is greatly improved; the integrity of the train is improved, the vibration amplitude is reduced, and the stability and comfort of the train are improved.

The invention provides a novel turbine acting device. The device comprises a shell, a wheel cavity, a wheel shaft, a rotor, a stator and the like, the shell is provided with an air inlet and an air outlet, the rotor is formed by arranging long-strip-shaped movable blades into a roller shape according to a certain angle, one end of the rotor is installed on a wheel body, the wheel body is fixed to the wheel shaft and installed in an inner wheel cavity of the shell, the stator is formed by arranging long-strip-shaped stator blades according to a certain angle to be in a cylindrical shape, one end of the stator is installed on the inner wall of the wheel cavity opposite to the wheel body, the other end of the rotor is arranged outside the stator in a sleeving manner, and the air inlet is in an involute shape on the circumferential face of the wheel cavity. The air outlet is formed in the center of the circumferential side face of the wheel cavity.

The invention relates to a stepping motor vibration reduction rotor. The stepping motor vibration reduction rotor comprises a rotor shaft, a front outer side rotor core, a rear outer side rotor core, a front inner side rotor core, a rear inner side rotor core, front side rotor core magnetic steel, rear side rotor core magnetic steel and a circular ring elastic body assembly; the rotor shaft sequentially penetrates through the front outer side rotor core, the front inner side rotor core, the circular ring elastic body assembly, the rear inner side rotor core and the rear outer side rotor core; the front outer side rotor core and the front inner side rotor core form a front rotor core set, and the front side rotor core magnetic steel is arranged in a groove of the front rotor core set; and the rear outer side rotor core and the rear inner side rotor core form a rear rotor iron core set, and the rear side rotor core magnetic steel is arranged in a groove of the rear rotor core set. Compared with the prior art, the rotor can reduce the vibration of the motor and improve the running stability of the motor.

A method for using the rotational kinetic energy of a permanent magnet synchronous draught fan for improving electric system damping comprises the following steps: step A, a parameter estimation method of a total least squares-rotation invariant subspace algorithm is used for identifying an inter-area oscillation mode frequency omega d according to a power fluctuation signal delta Pac of a tie line; step B, under a perturbation, the phase angle difference phi 2 between a fan rotor speed omega and wind power Pd is measured, the phase angle difference between the wind power Pd and an inter-area inertia center angular frequency omega COI is phi 1, and a phase angle phi 3 which needs compensation is calculated, wherein the phi 3 is equal to the sum of the phi 1 and the phi 2; then, a phase compensation method is used for setting a first time constant Ta and a second time constant Tb in a phase compensation link and a gain factor K in a gain link in a supplementary damping controller for the permanent magnet synchronous draught fan; step C, an inversion signal -Pac of the tie line is input into the supplementary damping controller so as to output a signal to adjust the rotating speed of the draught fan, wherein the signal is a draught fan rotating speed adjustment signal omega damp; therefore, the rotational kinetic energy of the draught fan is used for improving the electric system damping.

The invention discloses a variable frequency motor for a refrigerator. The variable frequency motor comprises a shell, a main shaft, a circuit board, a stator seat, a stator, a magnetic ring, a rotorshell, an elastic washer, a bakelite gasket and a bearing seat, wherein the circuit board, the stator seat, the stator, the magnetic ring, the rotor shell, the elastic washer, the bakelite gasket andthe bearing seat are arranged in the shell, the stator seat comprises a cylinder body and a bottom plate seat, the stator comprises an iron core and a three-phase winding coil, the three-phase windingcoil is arranged on the outer side surface of the cylinder body through the iron core, and the magnetic ring is arranged in the rotor shell and is sleeved on the periphery of the stator. According tothe invention, the variable-frequency motor for the refrigerator adopts a low-voltage direct-current power supply to drive the motor to rotate, so that stepless speed regulation control is realized;and the motor adopts an outer rotor structure, the rotor inertia of the outer rotor structure is large, the power density is high, and the heat dissipation is good, so that the motor is more energy-saving. The invention further discloses a fan adopting the variable frequency motor for the refrigerator, wherein a plurality of flow guide grooves are formed in the windward sides of fan blades, so that noise can be effectively lowered, and the resistance of fan starting to the fan blades of the fan is reduced so as to effectively reduce the load of the motor and improve the wind speed under the same power.