54results about How to "Raise the induced electromotive force" patented technology

The invention discloses a near field communication (NFC) antenna and terminal equipment. The NFC antenna comprises a substrate, a first coil and a second coil, wherein the first coil is arranged on the front surface of the substrate, the second coil is arranged on the back surface of the substrate, a feed end which is used for connecting with an antenna matching circuit is led out from one end of the first coil, the other end of the first coil is connected with one end of the second coil, and a feed end which is used for connecting with the antenna matching circuit is led out from the other end of the second coil which is not connected with the first coil. The NFC antenna and the terminal equipment have the advantages that the area of the NFC antenna can be effectively utilized; and on the premise that the total area (outer contour) of the NFC antenna is unchanged, the total antenna width is reduced, the coil turns and the effective area of the antenna are increased at the same time, the induced magnetic field intensity is enhanced, the induced electromotive force is improved and the antenna performance is improved.

The invention discloses a fixed-coil micro mechanical magnetic vibration energy collector basing on upconversion in the field of new energy technology. The collector comprises a vibration pickup station with low frequency, a resonance station with high frequency, a spacer and an induction coil; the vibration pickup station with low frequency comprises a coping, an upper-layer flat spring and a start-oscillation permanent magnet and / or a soft magnet. The upper-layer flat spring is fixed at the edge of the groove at the coping, the upper-layer flat spring comprises an upper-layer central platform and the surrounded upper-layer cantilever beam, the start-oscillation permanent magnet and / or the soft magnet are fixed on the upper-layer central platform; the resonance station with high frequency comprises frames, a lower-layer flat spring and a resonance permanent magnet, the lower-layer flat spring is fixed on the frames, the lower-layer flat spring comprises a lower-layer central platform and the surrounded lower-layer cantilever beam, and the resonance permanent magnet is fixed at the lower-layer central platform; the spacer is located between the resonance station with high frequency and the induction coil; the winding of the induction coil is fixed at the insulated underlay which is fixed under the spacer without movement. The conversion rate of the invention is high, and manufacture of batches and integration can be realized.

The invention relates to a micro broadband electromagnetic type vibration energy collector in the technical field of micro electro-mechanical systems. The micro broadband electromagnetic type vibration energy collector comprises a base, a low-frequency vibrating table, a medium-frequency vibrating table, an underframe, a high-frequency vibrating table and a top cover, wherein the medium-frequencyvibrating table comprises a first coil, a medium-frequency cantilever beam, a first pin, a first bonding pad and a second bonding pad, the low-frequency vibrating table comprises an outer frame, a spring connection component and a permanent magnet, and the high-frequency vibrating table comprises a second coil, a high-frequency cantilever beam, a second pin, a third bonding pad and a forth bonding pad. By the micro broadband electromagnetic type vibration energy collector, the voltage output can be increased, the application bandwidth can be enlarged, the application scope can be widened, andthe conversion efficiency can be increased. The micro broadband electromagnetic type vibration energy collector is easy for mass production.

The invention discloses a plane series connected magnetic circuit double side sounder. It includes: box shell where the plane series connected magnetic circuit is located in; the first shaking section that forms the first sound by the magnetic field in the first working magnetic interstice when the component of the first shaking section is impressed the first external sonic signal; the second shaking section that forms the second sound by the magnetic field in the second working magnetic interstice when the component of the second shaking section is impressed the second external sonic signal; the first external sonic signal and the second external sonic signal is impressed by the connector themselves. The sounder includes receiver and loudspeaker. One side is the loudspeaker that can send out music, and the other side is receiver that can deliver speech sound. The invention can satisfy the rigor request of the microminiaturization and high efficiency and multi-function of the communication electro-acoustic component as well as other special request of dense structure, low flux leakage, high sensitivity of the electro-acoustic component.

The invention discloses a permanent magnet linear generator, a magnetorheological damper and a magnetorheological damping system. The permanent magnet linear generator comprises a stator, a connection rod and a plurality of permanent magnets; the stator comprises an accommodation chamber with a telescopic mouth; the inner wall of the accommodation chamber is provided with a plurality of convex teeth at intervals; two opposite sides of the top end of each convex tooth extend along an axial direction of the accommodation chamber to form side teeth; the convex teeth and the side teeth are made of a permeability material, and the adjacent convex tooth and side tooth form a groove for accommodating an electromagnetic coil; the connection rod is positioned in the accommodation chamber of the stator, and is provided with a first connection end extending out of the telescopic mouth; and the plurality of permanent magnets are connected with the connection rod, and a magnetic pole is arranged between the adjacent permanent magnets. By the design of the convex teeth and the side teeth, more magnetic force lines pass through an air gap to form a closed-loop circuit; the utilization rate of a permanent magnet magnetic field is improved; and a value of an induced electromotive force is increased, and the electricity generation rate is high.

The invention discloses a double-magnet button type self-generating apparatus. The apparatus comprises the mainly components of an iron core, a coil, magnets and magnet yokes; the coil is wound on a plastic member; the iron core penetrates the plastic member; two ends of the iron core are respectively disposed between two magnet yokes which are disposed at the left side and at the right side; the four magnet yokes are disposed at the left side and at the right side in pairs, and one magnet is clamped between each pair of two magnet yokes at each side; the N poles and the S poles of the two magnets at the left side and at the right side are arranged to be in opposite directions, i.e., if the N pole of the magnet at the left side is oriented upwards, the S pole of the magnet at the right side is oriented upwards; the magnets and the magnet yokes at the left side and at the right side are connected through non-magnetic-conductive materials so as to form an integral button capable of moving vertically relative to the iron core; and when the button moves vertically, the iron core contacts with the magnet yokes at upper positions and at lower positions separately, and since the magnets at the two sides are arranged in opposite directions, the magnetic induction line of the iron core are reversed during the contact process, the coil generates induction potential. According to the double-magnet button type self-generating apparatus of the invention, micro energy of the button is used for power generation. The double-magnet button type self-generating apparatus is simple in structure and small in size; and the double-magnet button type self-generating apparatus can be applied to components such a wireless switch which needs automatic power generation of a button.

The invention discloses an intelligent identification plate, and belongs to the field of identification devices. The main points of the technical scheme are that the intelligent identification plate comprises an identification structure and power supply structures arranged on the road, the identification structure comprises a vertical column fixedly connected with the ground and a plate provided with identification information, the plate is fixedly connected with lamp strips arranged into the identification information, each power supply structure comprises induction power generation devices,each induction power generation device includes wires and permanent magnets which relatively and vertically slide, the wires are electrically connected with the lamp strips, the wires and the permanent magnets slide in a mutually approaching direction and the wires cut magnetic induction lines of the permanent magnets when a vehicle passes by the power supply structures, and each power supply structure further comprises reset springs which enable the wires and the magnets to slide in a direction of being away from each other. The intelligent identification plate has the effect that the energy-saving efficiency is not affected by the weather.

The invention provides a beam position detector used for an accelerator. By use of a cylindrical electrode with an obliquely cut end face, two parts with different area are allowed to appear on the surface of a single electrode. When beams pass through the detector and deflect towards one side with quite big area of one electrode in an electrode pair, sensing charges are gathered on the surface ofthe side of the electrode in a geometrical multiples manner, and arranged axially, so induced electromotive force is enhanced. Similarly, due to the separation of the beams, voltage signals acquiredby the other electrode in the electrode pair will be reduced in a geometrical multiples manner. In this way, in case of the same whole size of the electrode pair, quite induced area of the electrode can be ensured, the output voltage signals of the detector are allowed to be strong; the good linearity is achieved in the position of the beams. When the beams deflect, electric signal difference values between different electrodes in the same group of electrode pairs are amplified, so deflection quantity of beams can be rapidly and precisely reflected. When the sensitivity is ensured, precision is improved, and the detector is suitable for measurement of long beam groups or deflected beams.

The invention discloses a button-type self-generating device for wireless switches. The device is mainly composed of a core, a coil, magnetic steel, magnetic yokes, a spring, a support bar and a base plate. The coil is wound on the middle part of the U-type core. The two sides of the core respectively contact the two Z-type magnetic yokes. The two magnetic yokes can slide on the long support bar, the two magnetic yokes (with one behind the other) are respectively connected and fixed to the S and N poles of the strip-shaped magnetic steel, and the two magnetic yokes and the magnetic steel form an integrated piece. A button is connected with the integrated piece formed by the Z-type magnetic yokes and the magnetic steel. When the button is pressed, contacts between the two Z-type magnetic yokes and the two sides of the U-type core are exchanged, a reversal is finished through the flux of the U-type core, and the change in magnetic flux makes the coil wound on the U-type core produce an induced electromotive force. According to the invention, the micro energy of the button is used to generate electricity. The button-type self-generating device is simple in structure, small in size, and suitable for wireless switches and various occasions needing a button-type self-generating device.

The invention relates to a temperature control system and a method for frequency doubling crystal. The temperature control system comprises a frequency doubling crystal unit and a temperature controlcircuit device, the frequency doubling crystal unit comprises a crystal base and a frequency doubling crystal, the frequency doubling crystal is fixed over the crystal base, a groove is formed under the crystal base, a resistance wire is fixed in the groove under the crystal base, and a temperature sensor is close to the frequency doubling crystal; the temperature control circuit device comprisesan MCU and a current driving module. The power supply module is electrically connected with the MCU and the current driving module; wherein the MCU is in communication connection with a remote controlend, the MCU is connected with the current driving module and the analog-to-digital converter, controls the current driving module and acquires a temperature value converted by the analog-to-digitalconverter, the current driving module is connected with the resistance wire and controls the current of the resistance wire, and the analog-to-digital converter is connected with the temperature sensor and acquires a temperature value of the temperature sensor. The temperature of the frequency doubling crystal is controlled in a resistance wire heating mode, and accurate adjustment of the temperature of the frequency doubling crystal is achieved by controlling the heating power of the resistance wire.

The invention relates to a double-stator magnetic flux switching wind driven generator which mainly comprises an outer stator, a rotor and an inner stator. Wherein the outer stator consists of an outer stator iron core, a permanent magnet, a direct-current excitation winding and a three-phase armature winding; the inner stator is composed of an inner stator iron core, a permanent magnet, a direct-current excitation winding and a three-phase armature winding, a rotating shaft is arranged in the inner stator, the rotor is located between the outer stator and the inner stator and is of a doubly salient structure, and the rotor is composed of a rotor iron core and a magnetic isolation sleeve.A special rotor structure of the double-stator magnetic flux switching wind driven generator can keep the advantages of high power density and high torque density of the hybrid excitation motor, can realize the brushless effect of the generator, remarkably improves the wind energy utilization rate, greatly enhances the power generation efficiency and the power generation capacity, and is particularly suitable for wind power generation occasions such as remote areas or seas.

The super-large capacity auto voltage-regulating transformer has constant magnetic flux body with common winding, exciting winding I and voltage regulating winding on its iron core column, and variant magnetic flux body with exciting winding II and serial winding on its iron core column. It has the serial connection of common winding and serial winding, and the serial connection of exciting winding I, exciting winding II and voltage regulating winding. The voltage regulating winding may have 9 or 17 taps connected via two way switch with exciting winding I and exciting winding II; and the turn number ratio between the exciting winding II and the serial winding is 0.8-2.0. The present invention regulates the winding work turn number and magnetic field direction via changing the live switch, and has raised capacity of resisting high vibration potential caused by lightning shock wave.

The invention discloses a brushless excitation air core pulse generator, which belongs to the technical field of generators. The brushless excitation air core pulse generator, in the structure, comprises an air core stator base, an air core rotor base, a generator excitation winding, a generator armature winding, an exciter armature winding, an exciter excitation winding, a rotation shaft, a binding sleeve, a housing and an end cover. The brushless excitation air core pulse generator is divided to two parts of the generator and the exciter; the rotor winding is formed by the generator excitation winding and the exciter armature winding and is integrally cast through epoxy resin and is connected with the air core rotor base, and both are multi-phase windings and are in negative-phase-sequence connection. Thus, the frequency of the armature winding of a magnetic field cutting generator in a generator can be improved, the induction potential of the generator armature winding can be increased, the air core pulse generator is brushless, the whole reliability and the safety of the motor are improved, the excitation current upper limit is increased, and the energy storage density and the power density of the motor can be improved.

The invention discloses a high-reliability knock sensor which comprises a inductance coil, an iron core, a shell and a piece of permanent magnet, wherein the shell is internally provided with a set of inductance coil; the iron core is arranged in the middle of the inductance coil; and the permanent magnet is arranged at one end of the iron core. The sensor is capable of outputting signal voltage to an electronic controller during detonation, thus reminding a driver of repairing and maintaining a vehicle and preventing the failure of an engine from further worsening.

The invention discloses a variable excitation brushless alternating-current generator which has the advantages of good charging performance in low speed operation, middle speed operation and high speed operation and being free from frequent maintenance. The generator is characterized by consisting of a rotor assembly assembled in an inner ring of a stator assembly between a front end cover and a rear end cover, a rectifier fixed at the rear end of the rear end cover, a variable excitation and voltage adjustor, and a speed sensor of the generator, wherein three leads of the head end of stator three-phase winding of the stator assembly and one lead of the middle point of the stator three-phase winding of the stator assembly are electrically connected with four groups of rectifier diodes of the rectifier respectively; the variable excitation and voltage adjustor is electrically connected a lead at the head end of the rotor assembly double-excitation winding and two leads at the tail end of the rotor assembly double-excitation winding, an output of the rectifier and exciting pins through pins respectively, wherein the rotor assembly is fixed on the rear end cover; and the leads are electrically connected with the speed sensor of the generator.

The invention discloses a high-power density magnetic compression power generation mechanism. The high-power density magnetic compression power generation mechanism comprises a stator part and a rotorpart, wherein the stator part comprises first stator iron cores, and a plurality of second stator iron cores which are independent from the first stator iron cores and are vertically arranged; the plurality of second stator iron cores are distributed in parallel; a frame-free coil is arranged between the end part of each second stator iron core and the first stator iron core, and the gaps betweenthe plurality of second stator iron cores are communicated with the gaps between the plurality of frame-free coils to form a plurality of linear motion spaces; the rotor part comprises a plurality ofstrip-shaped permanent magnets which are in parallel and a rotor which is connected with the strip-shaped permanent magnets; and the plurality of permanent magnets are inserted into the linear motionspaces respectively, and high-frequency reciprocating movement is carried out under the driving of the rotor, so that the magnetic flux of the frame-free coils changes violently in the short time, and high electric potential is induced. The invention also discloses an electric generator comprising the power generation mechanism. According to the mechanism, the magnetic flux of the coil changes violently in the short time through high-frequency translation movement, so that high-power density power generation is realized.

The invention relates to a keyboard power generation structure and a power supply method thereof. The keyboard power generation structure comprises a keyboard box, a filter box is installed and communicated with one side of the keyboard box, a fan is installed and communicated with the other side of the keyboard box, a battery is installed at the top of the filter box, and a circuit board is installed in the middle of the inner side of the keyboard box; and the keys are embedded in the upper side surface of the circuit board and electrically connected with the circuit board, an induction power generation mechanism is arranged below each key cap, the induction power generation mechanisms are embedded in the lower side surface of the circuit board and electrically connected with the circuit board, and the induction power generation mechanisms are electrically connected with the battery through the circuit board. After the key cap is pressed, a transmission column is pressed downwards so that a user can conveniently press in the using process, and does not need other transmission operations, and a labor-saving state is achieved; mechanical energy in the knocking process can be converted into electric energy to the maximum extent, the upper side and the lower side of the circuit board is cooled in an air-cooling manner through the fan, and the keyboard power generation mechanism is capable of preventing dust and water and easy to clean through a waterproof cover.

The invention relates to the technical field of mechanical transmission, and particularly relates to a magnetic resistance type soft starter. The starter comprises a salient pole rotor, a permanent magnet rotor arranged inside or outside the salient pole rotor along an axial direction, a plurality of groove bodies and a plurality of first conductive pieces, wherein an air gap is reserved between the permanent magnet rotor and the salient pole rotor; the plurality of groove bodies are arranged on a peripheral wall of the salient pole rotor at preset intervals and are distributed along the peripheral wall of the salient pole rotor, and a salient pole is formed between every two adjacent groove bodies; and the plurality of first conductive pieces are arranged in the groove bodies and are connected with second conductive pieces arranged at two ends of the salient pole rotor. The invention provides a high-efficiency magnetic resistance type soft starter capable of realizing automatic switching to synchronous operation after asynchronous soft start.

The invention discloses a valve position indicator and a valve position indicating system. A body structure of the valve position indicator is included. The body structure comprises a continuous valveposition signal induction part which comprises a framework and a coil. The coil comprises a primary coil and two secondary coils. The coil is characterized in that the primary coil winds the framework externally, the two secondary coils wind the primary coil at the same time, the number of windings of one of the secondary coils is increased from a center of axis of the framework to a terminal A direction of the framework, and the number of windings of the other secondary coil is increased from the center of axis of the framework to a terminal B direction of the framework. By adopting a compensating coil structure, an induced electromotive force is increased, a nonlinear section is improved, and the linear measuring range of a continuous valve position signal is enlarged.

The invention discloses a fixed-coil micro mechanical magnetic vibration energy collector basing on upconversion in the field of new energy technology. The collector comprises a vibration pickup station with low frequency, a resonance station with high frequency, a spacer and an induction coil; the vibration pickup station with low frequency comprises a coping, an upper-layer flat spring and a start-oscillation permanent magnet and / or a soft magnet. The upper-layer flat spring is fixed at the edge of the groove at the coping, the upper-layer flat spring comprises an upper-layer central platform and the surrounded upper-layer cantilever beam, the start-oscillation permanent magnet and / or the soft magnet are fixed on the upper-layer central platform; the resonance station with high frequency comprises frames, a lower-layer flat spring and a resonance permanent magnet, the lower-layer flat spring is fixed on the frames, the lower-layer flat spring comprises a lower-layer central platformand the surrounded lower-layer cantilever beam, and the resonance permanent magnet is fixed at the lower-layer central platform; the spacer is located between the resonance station with high frequency and the induction coil; the winding of the induction coil is fixed at the insulated underlay which is fixed under the spacer without movement. The conversion rate of the invention is high, and manufacture of batches and integration can be realized.

The invention relates to a permanent magnetic vibration generation apparatus with trapezoidal magnetic yokes. The permanent magnetic vibration generation apparatus is characterized in that a main body structure of the generation apparatus is a cylindrical structure and comprises a cylindrical housing, a top cover, a vibration shaft and a bottom cover; upper and lower ends of the housing are fixedly connected with the top cover and the bottom cover through bolts respectively; a cylindrical through hole is formed in the center of the top cover; a coil outlet through hole is formed in one side of the center of the top cover; a hollow cylindrical hub is mounted in the center of the upper part of the bottom cover; a spring is arranged in a bottom hollow part of the hub; the lower part of the vibration shaft is in contact with the spring in the hub; the upper end of the vibration shaft vertically penetrates through a linear bearing and the top cover fixed with the vibration shaft, and is higher than the top cover; a regular quadrangular prism body is arranged in the middle of the vibration shaft; both upper and lower parts of the vibration shaft adopt cylindrical structures; quadrangular prism grooves are formed in four side surfaces of the regular quadrangular prism body in the middle; a trapezoidal magnetic yoke is bonded in each quadrangular prism body; and the four trapezoidal magnetic yokes are identical in shape and structure.

The invention relates to a low-frequency permanent magnet vibration generator. The low-frequency permanent magnet vibration generator is characterized in that a main body structure of the generator is a regularly quadrangular prism, the generator comprises four side plates, an upper end cap and a lower end cap, the four side plates are fixedly connected with the upper end cap and the lower end cap, a hole is formed in the middle of the upper end cap, a hollow cylindrical hub is arranged on the upper portion of the lower end cap, a spring is placed in a hollow portion of the bottom in the hub, a lower flange bearing of which the inner diameter is the same with the diameter of a vibrating shaft is arranged on the top of the hub and is fixedly connected with the top of the hollow cylindrical hub through a bolt, the lower portion of the vibrating shaft penetrates in the lower flange bearing and is in contact with the spring in the hub, and the upper end of the vibrating shaft penetrates in the upper flange bearing and the upper end cap fixed with the upper flange bearing, and is higher than the upper end cap. Under the excitation effect of sinusoidal vibration of which the vibration frequency is 1.25 Hz and the peak value is 150mm, an outgoing line of a coil on each side plate can be vibrated to generate an induced electromotive force of which the peak value is 30V, and the vibration generator has the considerable outputting voltage at low frequency.

The invention relates to an efficient direct-current generator, which comprises a base, a support frame, conductors, an induction coil, an annular magnetic field ring, bracing poles, a magnetic fieldcover, circular brushes, a coil shaft, a magnetic field shaft, bearings, and the like. The annular magnetic field ring is formed by arranging a plurality of horseshoe magnets in a circle, and the magnetic field directions of adjacent magnets are opposite. The induction coil is composed of multiple turns of wires, and cuts magnetic induction lines in a uniform magnetic field formed by the magnets.The coil is wound on the bracing poles in a concave-convex shape, and the bracing poles brace the induction coil and are connected with the coil shaft at the center so as to transfer power and push the coil to rotate. The magnetic field cover is arranged around the annular magnetic field ring to fix the annular magnetic field ring, and pushes the annular magnetic field ring to rotate through connection with the magnetic field shaft. The annular magnetic field ring and the induction coil rotate in opposite directions to increase the relative speed and generate huge induction electromotive force, and form a closed circuit through a wire to generate a current. The circular brushes are connected with the wire to transfer the current out, so as to generate stable direct-current power.

The invention discloses a monitoring method for a moving object. The method is applied to monitoring a moving object under the cooperation between a geomagnetic sensor and a signal processing circuit. A service range of entrance of the monitored moving object into the geomagnetic sensor is determined through sensing of the geomagnetic sensor; the motion of the moving object produces magnetic field distribution change, a voltage signal of corresponding variation rate of magnetic flux is acquired through the change of the magnetic flux produced by the magnetic field distribution change, and the voltage signal is input to a signal processing circuit. By the signal processing circuit, a mapping relation containing voltage indicated by a voltage signal is determined by the signal processing circuit, and the distance and the speed of the moving object corresponding to the voltage indicated by the voltage signal are acquired according to the mapping relation.

The invention discloses a vehicle applied alternate current generator which relates to the power generator technology field. The vehicle applied alternate current generator comprises a front end cover, a back end cover and a rotor and a stator fixedly arranged between the front end cover and the back end cover. The stator comprises a front pole claw and a back pole claw that are arranged in a cross manner; the stator comprises a stator iron core and stator coils wrapped on the stator iron core. The ratio of the thickness X1 of the front pole claw heel to the thickness L1 of the front pole claw bottom plate ranges from 0.91 to 1.2 containing 0.91 and 1.2; the ratio of the thickness X2 of the front pole claw tip to the thickness X1 of the front pole claw heel ranges from 0.26 to 0.5 containing 0.26 and 0.5. According to the invention, through the adjustment of size of the pole claw and the proportional relation, the induced electromotive force of the power generator is increased under the condition that the mechanical strength of the pole claw is ensured so as to enable the power generator to possess a good output capability and power generation efficiency and to reduce the size of the power generator effectively.

The invention relates to a micro broadband electromagnetic type vibration energy collector in the technical field of micro electro-mechanical systems. The micro broadband electromagnetic type vibration energy collector comprises a base, a low-frequency vibrating table, a medium-frequency vibrating table, an underframe, a high-frequency vibrating table and a top cover, wherein the medium-frequencyvibrating table comprises a first coil, a medium-frequency cantilever beam, a first pin, a first bonding pad and a second bonding pad, the low-frequency vibrating table comprises an outer frame, a spring connection component and a permanent magnet, and the high-frequency vibrating table comprises a second coil, a high-frequency cantilever beam, a second pin, a third bonding pad and a forth bonding pad. By the micro broadband electromagnetic type vibration energy collector, the voltage output can be increased, the application bandwidth can be enlarged, the application scope can be widened, andthe conversion efficiency can be increased. The micro broadband electromagnetic type vibration energy collector is easy for mass production.

The invention discloses a vehicle applied alternate current generator which relates to the power generator technology field. The vehicle applied alternate current generator comprises a front end cover, a back end cover and a rotor and a stator fixedly arranged between the front end cover and the back end cover. The stator comprises a front pole claw and a back pole claw that are arranged in a cross manner; the stator comprises a stator iron core and stator coils wrapped on the stator iron core. The ratio of the distance L2 from the front end face of the stator iron core to the inner side of the front pole claw to the thickness L1 of the front pole claw bottom plate is equal to or smaller than 0.19; the ratio of the distance Lp from the front end face of the stator iron core to the height of the stator core L3 is equal to or greater than 0.91. According to the invention, the induced electromotive force of the power generator is increased; the output power of the power generator is improved; the electric energy conversion efficiency is increased. Therefore, under the same diameter, the alternate current generator possesses advantageous power density and facilitates the reduction in the size of the power generator.

The invention discloses a small-sized efficient vertical axis wind turbine which comprises a tower frame, wherein the upper part of the tower frame is provided with a support frame; a wind power generating device is installed on the support frame, and a lightning-protection device is also arranged on the support frame; and meanwhile, a brake device is also installed between the wind power generating device and the support frame. The invention has convenient installation, is economic, attractive and safe and prevents lightning without noise, wire twisting phenomenon and scintillation effect and is quite suitable for being used on a roof of a building with high population density.